18 files changed, 1280 insertions, 1766 deletions
diff --git a/contrib/coccinelle/free.cocci b/contrib/coccinelle/free.cocci
index e28213161a..c03ba737e5 100644
--- a/contrib/coccinelle/free.cocci
+++ b/contrib/coccinelle/free.cocci
@@ -3,3 +3,9 @@ expression E;
 @@
 - if (E)
   free(E);
+
+@@
+expression E;
+@@
+- if (!E)
+  free(E);
diff --git a/contrib/coccinelle/qsort.cocci b/contrib/coccinelle/qsort.cocci
new file mode 100644
index 0000000000..22b93a9966
--- /dev/null
+++ b/contrib/coccinelle/qsort.cocci
@@ -0,0 +1,37 @@
+@@
+expression base, nmemb, compar;
+@@
+- qsort(base, nmemb, sizeof(*base), compar);
++ QSORT(base, nmemb, compar);
+
+@@
+expression base, nmemb, compar;
+@@
+- qsort(base, nmemb, sizeof(base[0]), compar);
++ QSORT(base, nmemb, compar);
+
+@@
+type T;
+T *base;
+expression nmemb, compar;
+@@
+- qsort(base, nmemb, sizeof(T), compar);
++ QSORT(base, nmemb, compar);
+
+@@
+expression base, nmemb, compar;
+@@
+- if (nmemb)
+    QSORT(base, nmemb, compar);
+
+@@
+expression base, nmemb, compar;
+@@
+- if (nmemb > 0)
+    QSORT(base, nmemb, compar);
+
+@@
+expression base, nmemb, compar;
+@@
+- if (nmemb > 1)
+    QSORT(base, nmemb, compar);
diff --git a/contrib/coccinelle/swap.cocci b/contrib/coccinelle/swap.cocci
new file mode 100644
index 0000000000..a0934d1fda
--- /dev/null
+++ b/contrib/coccinelle/swap.cocci
@@ -0,0 +1,28 @@
+@ swap_with_declaration @
+type T;
+identifier tmp;
+T a, b;
+@@
+- T tmp = a;
++ T tmp;
++ tmp = a;
+  a = b;
+  b = tmp;
+
+@ swap @
+type T;
+T tmp, a, b;
+@@
+- tmp = a;
+- a = b;
+- b = tmp;
++ SWAP(a, b);
+
+@ extends swap @
+identifier unused;
+@@
+  {
+  ...
+- T unused;
+  ... when != unused
+  }
diff --git a/contrib/coccinelle/xstrdup_or_null.cocci b/contrib/coccinelle/xstrdup_or_null.cocci
index 3fceef132b..8e05d1ca4b 100644
--- a/contrib/coccinelle/xstrdup_or_null.cocci
+++ b/contrib/coccinelle/xstrdup_or_null.cocci
@@ -5,3 +5,9 @@ expression V;
 - if (E)
 -    V = xstrdup(E);
 + V = xstrdup_or_null(E);
+
+@@
+expression E;
+@@
+- xstrdup(absolute_path(E))
++ absolute_pathdup(E)
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 21016bf8df..41ee52991d 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -936,6 +936,7 @@ _git_apply ()
 			--apply --no-add --exclude=
 			--ignore-whitespace --ignore-space-change
 			--whitespace= --inaccurate-eof --verbose
+			--recount --directory=
 			"
 		return
 	esac
@@ -947,13 +948,17 @@ _git_add ()
 	--*)
 		__gitcomp "
 			--interactive --refresh --patch --update --dry-run
-			--ignore-errors --intent-to-add
+			--ignore-errors --intent-to-add --force --edit --chmod=
 			"
 		return
 	esac
 
-	# XXX should we check for --update and --all options ?
-	__git_complete_index_file "--others --modified --directory --no-empty-directory"
+	local complete_opt="--others --modified --directory --no-empty-directory"
+	if test -n "$(__git_find_on_cmdline "-u --update")"
+	then
+		complete_opt="--modified"
+	fi
+	__git_complete_index_file "$complete_opt"
 }
 
 _git_archive ()
@@ -970,7 +975,7 @@ _git_archive ()
 	--*)
 		__gitcomp "
 			--format= --list --verbose
-			--prefix= --remote= --exec=
+			--prefix= --remote= --exec= --output
 			"
 		return
 		;;
@@ -1025,6 +1030,7 @@ _git_branch ()
 			--track --no-track --contains --merged --no-merged
 			--set-upstream-to= --edit-description --list
 			--unset-upstream --delete --move --remotes
+			--column --no-column --sort= --points-at
 			"
 		;;
 	*)
@@ -1138,6 +1144,8 @@ _git_clone ()
 			--single-branch
 			--branch
 			--recurse-submodules
+			--no-single-branch
+			--shallow-submodules
 			"
 		return
 		;;
@@ -1179,6 +1187,7 @@ _git_commit ()
 			--reset-author --file= --message= --template=
 			--cleanup= --untracked-files --untracked-files=
 			--verbose --quiet --fixup= --squash=
+			--patch --short --date --allow-empty
 			"
 		return
 	esac
@@ -1197,7 +1206,7 @@ _git_describe ()
 	--*)
 		__gitcomp "
 			--all --tags --contains --abbrev= --candidates=
-			--exact-match --debug --long --match --always
+			--exact-match --debug --long --match --always --first-parent
 			"
 		return
 	esac
@@ -1206,7 +1215,7 @@ _git_describe ()
 
 __git_diff_algorithms="myers minimal patience histogram"
 
-__git_diff_submodule_formats="log short"
+__git_diff_submodule_formats="diff log short"
 
 __git_diff_common_options="--stat --numstat --shortstat --summary
 			--patch-with-stat --name-only --name-status --color
@@ -1280,6 +1289,7 @@ __git_fetch_recurse_submodules="yes on-demand no"
 __git_fetch_options="
 	--quiet --verbose --append --upload-pack --force --keep --depth=
 	--tags --no-tags --all --prune --dry-run --recurse-submodules=
+	--unshallow --update-shallow
 "
 
 _git_fetch ()
@@ -1329,7 +1339,7 @@ _git_fsck ()
 	--*)
 		__gitcomp "
 			--tags --root --unreachable --cache --no-reflogs --full
-			--strict --verbose --lost-found
+			--strict --verbose --lost-found --name-objects
 			"
 		return
 		;;
@@ -1373,6 +1383,8 @@ _git_grep ()
 			--max-depth
 			--count
 			--and --or --not --all-match
+			--break --heading --show-function --function-context
+			--untracked --no-index
 			"
 		return
 		;;
@@ -1445,6 +1457,12 @@ _git_ls_files ()
 
 _git_ls_remote ()
 {
+	case "$cur" in
+	--*)
+		__gitcomp "--heads --tags --refs --get-url --symref"
+		return
+		;;
+	esac
 	__gitcomp_nl "$(__git_remotes)"
 }
 
@@ -1552,7 +1570,7 @@ _git_merge ()
 	case "$cur" in
 	--*)
 		__gitcomp "$__git_merge_options
-			--rerere-autoupdate --no-rerere-autoupdate --abort"
+			--rerere-autoupdate --no-rerere-autoupdate --abort --continue"
 		return
 	esac
 	__gitcomp_nl "$(__git_refs)"
@@ -1566,7 +1584,7 @@ _git_mergetool ()
 		return
 		;;
 	--*)
-		__gitcomp "--tool="
+		__gitcomp "--tool= --prompt --no-prompt"
 		return
 		;;
 	esac
@@ -1674,7 +1692,7 @@ _git_pull ()
 	__git_complete_remote_or_refspec
 }
 
-__git_push_recurse_submodules="check on-demand"
+__git_push_recurse_submodules="check on-demand only"
 
 __git_complete_force_with_lease ()
 {
@@ -1734,10 +1752,10 @@ _git_rebase ()
 {
 	local dir="$(__gitdir)"
 	if [ -f "$dir"/rebase-merge/interactive ]; then
-		__gitcomp "--continue --skip --abort --edit-todo"
+		__gitcomp "--continue --skip --abort --quit --edit-todo"
 		return
 	elif [ -d "$dir"/rebase-apply ] || [ -d "$dir"/rebase-merge ]; then
-		__gitcomp "--continue --skip --abort"
+		__gitcomp "--continue --skip --abort --quit"
 		return
 	fi
 	__git_complete_strategy && return
@@ -2374,40 +2392,88 @@ _git_config ()
 
 _git_remote ()
 {
-	local subcommands="add rename remove set-head set-branches set-url show prune update"
+	local subcommands="
+		add rename remove set-head set-branches
+		get-url set-url show prune update
+		"
 	local subcommand="$(__git_find_on_cmdline "$subcommands")"
 	if [ -z "$subcommand" ]; then
-		__gitcomp "$subcommands"
+		case "$cur" in
+		--*)
+			__gitcomp "--verbose"
+			;;
+		*)
+			__gitcomp "$subcommands"
+			;;
+		esac
 		return
 	fi
 
-	case "$subcommand" in
-	rename|remove|set-url|show|prune)
-		__gitcomp_nl "$(__git_remotes)"
+	case "$subcommand,$cur" in
+	add,--*)
+		__gitcomp "--track --master --fetch --tags --no-tags --mirror="
+		;;
+	add,*)
+		;;
+	set-head,--*)
+		__gitcomp "--auto --delete"
+		;;
+	set-branches,--*)
+		__gitcomp "--add"
 		;;
-	set-head|set-branches)
+	set-head,*|set-branches,*)
 		__git_complete_remote_or_refspec
 		;;
-	update)
+	update,--*)
+		__gitcomp "--prune"
+		;;
+	update,*)
 		__gitcomp "$(__git_get_config_variables "remotes")"
 		;;
+	set-url,--*)
+		__gitcomp "--push --add --delete"
+		;;
+	get-url,--*)
+		__gitcomp "--push --all"
+		;;
+	prune,--*)
+		__gitcomp "--dry-run"
+		;;
 	*)
+		__gitcomp_nl "$(__git_remotes)"
 		;;
 	esac
 }
 
 _git_replace ()
 {
+	case "$cur" in
+	--*)
+		__gitcomp "--edit --graft --format= --list --delete"
+		return
+		;;
+	esac
 	__gitcomp_nl "$(__git_refs)"
 }
 
+_git_rerere ()
+{
+	local subcommands="clear forget diff remaining status gc"
+	local subcommand="$(__git_find_on_cmdline "$subcommands")"
+	if test -z "$subcommand"
+	then
+		__gitcomp "$subcommands"
+		return
+	fi
+}
+
 _git_reset ()
 {
 	__git_has_doubledash && return
 
 	case "$cur" in
 	--*)
-		__gitcomp "--merge --mixed --hard --soft --patch"
+		__gitcomp "--merge --mixed --hard --soft --patch --keep"
 		return
 		;;
 	esac
@@ -2423,7 +2489,10 @@ _git_revert ()
 	fi
 	case "$cur" in
 	--*)
-		__gitcomp "--edit --mainline --no-edit --no-commit --signoff"
+		__gitcomp "
+			--edit --mainline --no-edit --no-commit --signoff
+			--strategy= --strategy-option=
+			"
 		return
 		;;
 	esac
@@ -2451,7 +2520,7 @@ _git_shortlog ()
 		__gitcomp "
 			$__git_log_common_options
 			$__git_log_shortlog_options
-			--numbered --summary
+			--numbered --summary --email
 			"
 		return
 		;;
@@ -2556,10 +2625,11 @@ _git_submodule ()
 	__git_has_doubledash && return
 
 	local subcommands="add status init deinit update summary foreach sync"
-	if [ -z "$(__git_find_on_cmdline "$subcommands")" ]; then
+	local subcommand="$(__git_find_on_cmdline "$subcommands")"
+	if [ -z "$subcommand" ]; then
 		case "$cur" in
 		--*)
-			__gitcomp "--quiet --cached"
+			__gitcomp "--quiet"
 			;;
 		*)
 			__gitcomp "$subcommands"
@@ -2567,6 +2637,33 @@ _git_submodule ()
 		esac
 		return
 	fi
+
+	case "$subcommand,$cur" in
+	add,--*)
+		__gitcomp "--branch --force --name --reference --depth"
+		;;
+	status,--*)
+		__gitcomp "--cached --recursive"
+		;;
+	deinit,--*)
+		__gitcomp "--force --all"
+		;;
+	update,--*)
+		__gitcomp "
+			--init --remote --no-fetch
+			--recommend-shallow --no-recommend-shallow
+			--force --rebase --merge --reference --depth --recursive --jobs
+		"
+		;;
+	summary,--*)
+		__gitcomp "--cached --files --summary-limit"
+		;;
+	foreach,--*|sync,--*)
+		__gitcomp "--recursive"
+		;;
+	*)
+		;;
+	esac
 }
 
 _git_svn ()
@@ -2587,14 +2684,14 @@ _git_svn ()
 			--no-metadata --use-svm-props --use-svnsync-props
 			--log-window-size= --no-checkout --quiet
 			--repack-flags --use-log-author --localtime
+			--add-author-from
 			--ignore-paths= --include-paths= $remote_opts
 			"
 		local init_opts="
 			--template= --shared= --trunk= --tags=
 			--branches= --stdlayout --minimize-url
 			--no-metadata --use-svm-props --use-svnsync-props
-			--rewrite-root= --prefix= --use-log-author
-			--add-author-from $remote_opts
+			--rewrite-root= --prefix= $remote_opts
 			"
 		local cmt_opts="
 			--edit --rmdir --find-copies-harder --copy-similarity=
@@ -2701,8 +2798,8 @@ _git_tag ()
 	--*)
 		__gitcomp "
 			--list --delete --verify --annotate --message --file
-			--sign --cleanup --local-user --force --column --sort
-			--contains --points-at
+			--sign --cleanup --local-user --force --column --sort=
+			--contains --points-at --merged --no-merged --create-reflog
 			"
 		;;
 	esac
diff --git a/contrib/convert-objects/convert-objects.c b/contrib/convert-objects/convert-objects.c
deleted file mode 100644
index f3b57bf1d2..0000000000
--- a/contrib/convert-objects/convert-objects.c
+++ /dev/null
@@ -1,329 +0,0 @@
-#include "cache.h"
-#include "blob.h"
-#include "commit.h"
-#include "tree.h"
-
-struct entry {
-	unsigned char old_sha1[20];
-	unsigned char new_sha1[20];
-	int converted;
-};
-
-#define MAXOBJECTS (1000000)
-
-static struct entry *convert[MAXOBJECTS];
-static int nr_convert;
-
-static struct entry * convert_entry(unsigned char *sha1);
-
-static struct entry *insert_new(unsigned char *sha1, int pos)
-{
-	struct entry *new = xcalloc(1, sizeof(struct entry));
-	hashcpy(new->old_sha1, sha1);
-	memmove(convert + pos + 1, convert + pos, (nr_convert - pos) * sizeof(struct entry *));
-	convert[pos] = new;
-	nr_convert++;
-	if (nr_convert == MAXOBJECTS)
-		die("you're kidding me - hit maximum object limit");
-	return new;
-}
-
-static struct entry *lookup_entry(unsigned char *sha1)
-{
-	int low = 0, high = nr_convert;
-
-	while (low < high) {
-		int next = (low + high) / 2;
-		struct entry *n = convert[next];
-		int cmp = hashcmp(sha1, n->old_sha1);
-		if (!cmp)
-			return n;
-		if (cmp < 0) {
-			high = next;
-			continue;
-		}
-		low = next+1;
-	}
-	return insert_new(sha1, low);
-}
-
-static void convert_binary_sha1(void *buffer)
-{
-	struct entry *entry = convert_entry(buffer);
-	hashcpy(buffer, entry->new_sha1);
-}
-
-static void convert_ascii_sha1(void *buffer)
-{
-	unsigned char sha1[20];
-	struct entry *entry;
-
-	if (get_sha1_hex(buffer, sha1))
-		die("expected sha1, got '%s'", (char *) buffer);
-	entry = convert_entry(sha1);
-	memcpy(buffer, sha1_to_hex(entry->new_sha1), 40);
-}
-
-static unsigned int convert_mode(unsigned int mode)
-{
-	unsigned int newmode;
-
-	newmode = mode & S_IFMT;
-	if (S_ISREG(mode))
-		newmode |= (mode & 0100) ? 0755 : 0644;
-	return newmode;
-}
-
-static int write_subdirectory(void *buffer, unsigned long size, const char *base, int baselen, unsigned char *result_sha1)
-{
-	char *new = xmalloc(size);
-	unsigned long newlen = 0;
-	unsigned long used;
-
-	used = 0;
-	while (size) {
-		int len = 21 + strlen(buffer);
-		char *path = strchr(buffer, ' ');
-		unsigned char *sha1;
-		unsigned int mode;
-		char *slash, *origpath;
-
-		if (!path || strtoul_ui(buffer, 8, &mode))
-			die("bad tree conversion");
-		mode = convert_mode(mode);
-		path++;
-		if (memcmp(path, base, baselen))
-			break;
-		origpath = path;
-		path += baselen;
-		slash = strchr(path, '/');
-		if (!slash) {
-			newlen += sprintf(new + newlen, "%o %s", mode, path);
-			new[newlen++] = '\0';
-			hashcpy((unsigned char *)new + newlen, (unsigned char *) buffer + len - 20);
-			newlen += 20;
-
-			used += len;
-			size -= len;
-			buffer = (char *) buffer + len;
-			continue;
-		}
-
-		newlen += sprintf(new + newlen, "%o %.*s", S_IFDIR, (int)(slash - path), path);
-		new[newlen++] = 0;
-		sha1 = (unsigned char *)(new + newlen);
-		newlen += 20;
-
-		len = write_subdirectory(buffer, size, origpath, slash-origpath+1, sha1);
-
-		used += len;
-		size -= len;
-		buffer = (char *) buffer + len;
-	}
-
-	write_sha1_file(new, newlen, tree_type, result_sha1);
-	free(new);
-	return used;
-}
-
-static void convert_tree(void *buffer, unsigned long size, unsigned char *result_sha1)
-{
-	void *orig_buffer = buffer;
-	unsigned long orig_size = size;
-
-	while (size) {
-		size_t len = 1+strlen(buffer);
-
-		convert_binary_sha1((char *) buffer + len);
-
-		len += 20;
-		if (len > size)
-			die("corrupt tree object");
-		size -= len;
-		buffer = (char *) buffer + len;
-	}
-
-	write_subdirectory(orig_buffer, orig_size, "", 0, result_sha1);
-}
-
-static unsigned long parse_oldstyle_date(const char *buf)
-{
-	char c, *p;
-	char buffer[100];
-	struct tm tm;
-	const char *formats[] = {
-		"%c",
-		"%a %b %d %T",
-		"%Z",
-		"%Y",
-		" %Y",
-		NULL
-	};
-	/* We only ever did two timezones in the bad old format .. */
-	const char *timezones[] = {
-		"PDT", "PST", "CEST", NULL
-	};
-	const char **fmt = formats;
-
-	p = buffer;
-	while (isspace(c = *buf))
-		buf++;
-	while ((c = *buf++) != '\n')
-		*p++ = c;
-	*p++ = 0;
-	buf = buffer;
-	memset(&tm, 0, sizeof(tm));
-	do {
-		const char *next = strptime(buf, *fmt, &tm);
-		if (next) {
-			if (!*next)
-				return mktime(&tm);
-			buf = next;
-		} else {
-			const char **p = timezones;
-			while (isspace(*buf))
-				buf++;
-			while (*p) {
-				if (!memcmp(buf, *p, strlen(*p))) {
-					buf += strlen(*p);
-					break;
-				}
-				p++;
-			}
-		}
-		fmt++;
-	} while (*buf && *fmt);
-	printf("left: %s\n", buf);
-	return mktime(&tm);
-}
-
-static int convert_date_line(char *dst, void **buf, unsigned long *sp)
-{
-	unsigned long size = *sp;
-	char *line = *buf;
-	char *next = strchr(line, '\n');
-	char *date = strchr(line, '>');
-	int len;
-
-	if (!next || !date)
-		die("missing or bad author/committer line %s", line);
-	next++; date += 2;
-
-	*buf = next;
-	*sp = size - (next - line);
-
-	len = date - line;
-	memcpy(dst, line, len);
-	dst += len;
-
-	/* Is it already in new format? */
-	if (isdigit(*date)) {
-		int datelen = next - date;
-		memcpy(dst, date, datelen);
-		return len + datelen;
-	}
-
-	/*
-	 * Hacky hacky: one of the sparse old-style commits does not have
-	 * any date at all, but we can fake it by using the committer date.
-	 */
-	if (*date == '\n' && strchr(next, '>'))
-		date = strchr(next, '>')+2;
-
-	return len + sprintf(dst, "%lu -0700\n", parse_oldstyle_date(date));
-}
-
-static void convert_date(void *buffer, unsigned long size, unsigned char *result_sha1)
-{
-	char *new = xmalloc(size + 100);
-	unsigned long newlen = 0;
-
-	/* "tree <sha1>\n" */
-	memcpy(new + newlen, buffer, 46);
-	newlen += 46;
-	buffer = (char *) buffer + 46;
-	size -= 46;
-
-	/* "parent <sha1>\n" */
-	while (!memcmp(buffer, "parent ", 7)) {
-		memcpy(new + newlen, buffer, 48);
-		newlen += 48;
-		buffer = (char *) buffer + 48;
-		size -= 48;
-	}
-
-	/* "author xyz <xyz> date" */
-	newlen += convert_date_line(new + newlen, &buffer, &size);
-	/* "committer xyz <xyz> date" */
-	newlen += convert_date_line(new + newlen, &buffer, &size);
-
-	/* Rest */
-	memcpy(new + newlen, buffer, size);
-	newlen += size;
-
-	write_sha1_file(new, newlen, commit_type, result_sha1);
-	free(new);
-}
-
-static void convert_commit(void *buffer, unsigned long size, unsigned char *result_sha1)
-{
-	void *orig_buffer = buffer;
-	unsigned long orig_size = size;
-
-	if (memcmp(buffer, "tree ", 5))
-		die("Bad commit '%s'", (char *) buffer);
-	convert_ascii_sha1((char *) buffer + 5);
-	buffer = (char *) buffer + 46;    /* "tree " + "hex sha1" + "\n" */
-	while (!memcmp(buffer, "parent ", 7)) {
-		convert_ascii_sha1((char *) buffer + 7);
-		buffer = (char *) buffer + 48;
-	}
-	convert_date(orig_buffer, orig_size, result_sha1);
-}
-
-static struct entry * convert_entry(unsigned char *sha1)
-{
-	struct entry *entry = lookup_entry(sha1);
-	enum object_type type;
-	void *buffer, *data;
-	unsigned long size;
-
-	if (entry->converted)
-		return entry;
-	data = read_sha1_file(sha1, &type, &size);
-	if (!data)
-		die("unable to read object %s", sha1_to_hex(sha1));
-
-	buffer = xmalloc(size);
-	memcpy(buffer, data, size);
-
-	if (type == OBJ_BLOB) {
-		write_sha1_file(buffer, size, blob_type, entry->new_sha1);
-	} else if (type == OBJ_TREE)
-		convert_tree(buffer, size, entry->new_sha1);
-	else if (type == OBJ_COMMIT)
-		convert_commit(buffer, size, entry->new_sha1);
-	else
-		die("unknown object type %d in %s", type, sha1_to_hex(sha1));
-	entry->converted = 1;
-	free(buffer);
-	free(data);
-	return entry;
-}
-
-int main(int argc, char **argv)
-{
-	unsigned char sha1[20];
-	struct entry *entry;
-
-	setup_git_directory();
-
-	if (argc != 2)
-		usage("git-convert-objects <sha1>");
-	if (get_sha1(argv[1], sha1))
-		die("Not a valid object name %s", argv[1]);
-
-	entry = convert_entry(sha1);
-	printf("new sha1: %s\n", sha1_to_hex(entry->new_sha1));
-	return 0;
-}
diff --git a/contrib/convert-objects/git-convert-objects.txt b/contrib/convert-objects/git-convert-objects.txt
deleted file mode 100644
index f871880cfb..0000000000
--- a/contrib/convert-objects/git-convert-objects.txt
+++ /dev/null
@@ -1,29 +0,0 @@
-git-convert-objects(1)
-======================
-
-NAME
-----
-git-convert-objects - Converts old-style git repository
-
-
-SYNOPSIS
---------
-[verse]
-'git-convert-objects'
-
-DESCRIPTION
------------
-Converts old-style git repository to the latest format
-
-
-Author
-------
-Written by Linus Torvalds <torvalds@osdl.org>
-
-Documentation
---------------
-Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>.
-
-GIT
----
-Part of the linkgit:git[7] suite
diff --git a/contrib/credential/libsecret/Makefile b/contrib/credential/libsecret/Makefile
new file mode 100644
index 0000000000..3e67552cc5
--- /dev/null
+++ b/contrib/credential/libsecret/Makefile
@@ -0,0 +1,25 @@
+MAIN:=git-credential-libsecret
+all:: $(MAIN)
+
+CC = gcc
+RM = rm -f
+CFLAGS = -g -O2 -Wall
+PKG_CONFIG = pkg-config
+
+-include ../../../config.mak.autogen
+-include ../../../config.mak
+
+INCS:=$(shell $(PKG_CONFIG) --cflags libsecret-1 glib-2.0)
+LIBS:=$(shell $(PKG_CONFIG) --libs libsecret-1 glib-2.0)
+
+SRCS:=$(MAIN).c
+OBJS:=$(SRCS:.c=.o)
+
+%.o: %.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(INCS) -o $@ -c $<
+
+$(MAIN): $(OBJS)
+	$(CC) -o $@ $(LDFLAGS) $^ $(LIBS)
+
+clean:
+	@$(RM) $(MAIN) $(OBJS)
diff --git a/contrib/credential/libsecret/git-credential-libsecret.c b/contrib/credential/libsecret/git-credential-libsecret.c
new file mode 100644
index 0000000000..4c56979d8a
--- /dev/null
+++ b/contrib/credential/libsecret/git-credential-libsecret.c
@@ -0,0 +1,370 @@
+/*
+ * Copyright (C) 2011 John Szakmeister <john@szakmeister.net>
+ *               2012 Philipp A. Hartmann <pah@qo.cx>
+ *               2016 Mantas Mikulėnas <grawity@gmail.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ * Credits:
+ * - GNOME Keyring API handling originally written by John Szakmeister
+ * - ported to credential helper API by Philipp A. Hartmann
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <glib.h>
+#include <libsecret/secret.h>
+
+/*
+ * This credential struct and API is simplified from git's credential.{h,c}
+ */
+struct credential {
+	char *protocol;
+	char *host;
+	unsigned short port;
+	char *path;
+	char *username;
+	char *password;
+};
+
+#define CREDENTIAL_INIT { NULL, NULL, 0, NULL, NULL, NULL }
+
+typedef int (*credential_op_cb)(struct credential *);
+
+struct credential_operation {
+	char *name;
+	credential_op_cb op;
+};
+
+#define CREDENTIAL_OP_END { NULL, NULL }
+
+/* ----------------- Secret Service functions ----------------- */
+
+static char *make_label(struct credential *c)
+{
+	if (c->port)
+		return g_strdup_printf("Git: %s://%s:%hu/%s",
+					c->protocol, c->host, c->port, c->path ? c->path : "");
+	else
+		return g_strdup_printf("Git: %s://%s/%s",
+					c->protocol, c->host, c->path ? c->path : "");
+}
+
+static GHashTable *make_attr_list(struct credential *c)
+{
+	GHashTable *al = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_free);
+
+	if (c->username)
+		g_hash_table_insert(al, "user", g_strdup(c->username));
+	if (c->protocol)
+		g_hash_table_insert(al, "protocol", g_strdup(c->protocol));
+	if (c->host)
+		g_hash_table_insert(al, "server", g_strdup(c->host));
+	if (c->port)
+		g_hash_table_insert(al, "port", g_strdup_printf("%hu", c->port));
+	if (c->path)
+		g_hash_table_insert(al, "object", g_strdup(c->path));
+
+	return al;
+}
+
+static int keyring_get(struct credential *c)
+{
+	SecretService *service = NULL;
+	GHashTable *attributes = NULL;
+	GError *error = NULL;
+	GList *items = NULL;
+
+	if (!c->protocol || !(c->host || c->path))
+		return EXIT_FAILURE;
+
+	service = secret_service_get_sync(0, NULL, &error);
+	if (error != NULL) {
+		g_critical("could not connect to Secret Service: %s", error->message);
+		g_error_free(error);
+		return EXIT_FAILURE;
+	}
+
+	attributes = make_attr_list(c);
+	items = secret_service_search_sync(service,
+					   SECRET_SCHEMA_COMPAT_NETWORK,
+					   attributes,
+					   SECRET_SEARCH_LOAD_SECRETS,
+					   NULL,
+					   &error);
+	g_hash_table_unref(attributes);
+	if (error != NULL) {
+		g_critical("lookup failed: %s", error->message);
+		g_error_free(error);
+		return EXIT_FAILURE;
+	}
+
+	if (items != NULL) {
+		SecretItem *item;
+		SecretValue *secret;
+		const char *s;
+
+		item = items->data;
+		secret = secret_item_get_secret(item);
+		attributes = secret_item_get_attributes(item);
+
+		s = g_hash_table_lookup(attributes, "user");
+		if (s) {
+			g_free(c->username);
+			c->username = g_strdup(s);
+		}
+
+		s = secret_value_get_text(secret);
+		if (s) {
+			g_free(c->password);
+			c->password = g_strdup(s);
+		}
+
+		g_hash_table_unref(attributes);
+		secret_value_unref(secret);
+		g_list_free_full(items, g_object_unref);
+	}
+
+	return EXIT_SUCCESS;
+}
+
+
+static int keyring_store(struct credential *c)
+{
+	char *label = NULL;
+	GHashTable *attributes = NULL;
+	GError *error = NULL;
+
+	/*
+	 * Sanity check that what we are storing is actually sensible.
+	 * In particular, we can't make a URL without a protocol field.
+	 * Without either a host or pathname (depending on the scheme),
+	 * we have no primary key. And without a username and password,
+	 * we are not actually storing a credential.
+	 */
+	if (!c->protocol || !(c->host || c->path) ||
+	    !c->username || !c->password)
+		return EXIT_FAILURE;
+
+	label = make_label(c);
+	attributes = make_attr_list(c);
+	secret_password_storev_sync(SECRET_SCHEMA_COMPAT_NETWORK,
+				    attributes,
+				    NULL,
+				    label,
+				    c->password,
+				    NULL,
+				    &error);
+	g_free(label);
+	g_hash_table_unref(attributes);
+
+	if (error != NULL) {
+		g_critical("store failed: %s", error->message);
+		g_error_free(error);
+		return EXIT_FAILURE;
+	}
+
+	return EXIT_SUCCESS;
+}
+
+static int keyring_erase(struct credential *c)
+{
+	GHashTable *attributes = NULL;
+	GError *error = NULL;
+
+	/*
+	 * Sanity check that we actually have something to match
+	 * against. The input we get is a restrictive pattern,
+	 * so technically a blank credential means "erase everything".
+	 * But it is too easy to accidentally send this, since it is equivalent
+	 * to empty input. So explicitly disallow it, and require that the
+	 * pattern have some actual content to match.
+	 */
+	if (!c->protocol && !c->host && !c->path && !c->username)
+		return EXIT_FAILURE;
+
+	attributes = make_attr_list(c);
+	secret_password_clearv_sync(SECRET_SCHEMA_COMPAT_NETWORK,
+				    attributes,
+				    NULL,
+				    &error);
+	g_hash_table_unref(attributes);
+
+	if (error != NULL) {
+		g_critical("erase failed: %s", error->message);
+		g_error_free(error);
+		return EXIT_FAILURE;
+	}
+
+	return EXIT_SUCCESS;
+}
+
+/*
+ * Table with helper operation callbacks, used by generic
+ * credential helper main function.
+ */
+static struct credential_operation const credential_helper_ops[] = {
+	{ "get",   keyring_get },
+	{ "store", keyring_store },
+	{ "erase", keyring_erase },
+	CREDENTIAL_OP_END
+};
+
+/* ------------------ credential functions ------------------ */
+
+static void credential_init(struct credential *c)
+{
+	memset(c, 0, sizeof(*c));
+}
+
+static void credential_clear(struct credential *c)
+{
+	g_free(c->protocol);
+	g_free(c->host);
+	g_free(c->path);
+	g_free(c->username);
+	g_free(c->password);
+
+	credential_init(c);
+}
+
+static int credential_read(struct credential *c)
+{
+	char *buf;
+	size_t line_len;
+	char *key;
+	char *value;
+
+	key = buf = g_malloc(1024);
+
+	while (fgets(buf, 1024, stdin)) {
+		line_len = strlen(buf);
+
+		if (line_len && buf[line_len-1] == '\n')
+			buf[--line_len] = '\0';
+
+		if (!line_len)
+			break;
+
+		value = strchr(buf, '=');
+		if (!value) {
+			g_warning("invalid credential line: %s", key);
+			g_free(buf);
+			return -1;
+		}
+		*value++ = '\0';
+
+		if (!strcmp(key, "protocol")) {
+			g_free(c->protocol);
+			c->protocol = g_strdup(value);
+		} else if (!strcmp(key, "host")) {
+			g_free(c->host);
+			c->host = g_strdup(value);
+			value = strrchr(c->host, ':');
+			if (value) {
+				*value++ = '\0';
+				c->port = atoi(value);
+			}
+		} else if (!strcmp(key, "path")) {
+			g_free(c->path);
+			c->path = g_strdup(value);
+		} else if (!strcmp(key, "username")) {
+			g_free(c->username);
+			c->username = g_strdup(value);
+		} else if (!strcmp(key, "password")) {
+			g_free(c->password);
+			c->password = g_strdup(value);
+			while (*value)
+				*value++ = '\0';
+		}
+		/*
+		 * Ignore other lines; we don't know what they mean, but
+		 * this future-proofs us when later versions of git do
+		 * learn new lines, and the helpers are updated to match.
+		 */
+	}
+
+	g_free(buf);
+
+	return 0;
+}
+
+static void credential_write_item(FILE *fp, const char *key, const char *value)
+{
+	if (!value)
+		return;
+	fprintf(fp, "%s=%s\n", key, value);
+}
+
+static void credential_write(const struct credential *c)
+{
+	/* only write username/password, if set */
+	credential_write_item(stdout, "username", c->username);
+	credential_write_item(stdout, "password", c->password);
+}
+
+static void usage(const char *name)
+{
+	struct credential_operation const *try_op = credential_helper_ops;
+	const char *basename = strrchr(name, '/');
+
+	basename = (basename) ? basename + 1 : name;
+	fprintf(stderr, "usage: %s <", basename);
+	while (try_op->name) {
+		fprintf(stderr, "%s", (try_op++)->name);
+		if (try_op->name)
+			fprintf(stderr, "%s", "|");
+	}
+	fprintf(stderr, "%s", ">\n");
+}
+
+int main(int argc, char *argv[])
+{
+	int ret = EXIT_SUCCESS;
+
+	struct credential_operation const *try_op = credential_helper_ops;
+	struct credential cred = CREDENTIAL_INIT;
+
+	if (!argv[1]) {
+		usage(argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	g_set_application_name("Git Credential Helper");
+
+	/* lookup operation callback */
+	while (try_op->name && strcmp(argv[1], try_op->name))
+		try_op++;
+
+	/* unsupported operation given -- ignore silently */
+	if (!try_op->name || !try_op->op)
+		goto out;
+
+	ret = credential_read(&cred);
+	if (ret)
+		goto out;
+
+	/* perform credential operation */
+	ret = (*try_op->op)(&cred);
+
+	credential_write(&cred);
+
+out:
+	credential_clear(&cred);
+	return ret;
+}
diff --git a/contrib/examples/git-difftool.perl b/contrib/examples/git-difftool.perl
new file mode 100755
index 0000000000..df59bdfe97
--- /dev/null
+++ b/contrib/examples/git-difftool.perl
@@ -0,0 +1,481 @@
+#!/usr/bin/perl
+# Copyright (c) 2009, 2010 David Aguilar
+# Copyright (c) 2012 Tim Henigan
+#
+# This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
+# git-difftool--helper script.
+#
+# This script exports GIT_EXTERNAL_DIFF and GIT_PAGER for use by git.
+# The GIT_DIFF* variables are exported for use by git-difftool--helper.
+#
+# Any arguments that are unknown to this script are forwarded to 'git diff'.
+
+use 5.008;
+use strict;
+use warnings;
+use Error qw(:try);
+use File::Basename qw(dirname);
+use File::Copy;
+use File::Find;
+use File::stat;
+use File::Path qw(mkpath rmtree);
+use File::Temp qw(tempdir);
+use Getopt::Long qw(:config pass_through);
+use Git;
+use Git::I18N;
+
+sub usage
+{
+	my $exitcode = shift;
+	print << 'USAGE';
+usage: git difftool [-t|--tool=<tool>] [--tool-help]
+                    [-x|--extcmd=<cmd>]
+                    [-g|--gui] [--no-gui]
+                    [--prompt] [-y|--no-prompt]
+                    [-d|--dir-diff]
+                    ['git diff' options]
+USAGE
+	exit($exitcode);
+}
+
+sub print_tool_help
+{
+	# See the comment at the bottom of file_diff() for the reason behind
+	# using system() followed by exit() instead of exec().
+	my $rc = system(qw(git mergetool --tool-help=diff));
+	exit($rc | ($rc >> 8));
+}
+
+sub exit_cleanup
+{
+	my ($tmpdir, $status) = @_;
+	my $errno = $!;
+	rmtree($tmpdir);
+	if ($status and $errno) {
+		my ($package, $file, $line) = caller();
+		warn "$file line $line: $errno\n";
+	}
+	exit($status | ($status >> 8));
+}
+
+sub use_wt_file
+{
+	my ($file, $sha1) = @_;
+	my $null_sha1 = '0' x 40;
+
+	if (-l $file || ! -e _) {
+		return (0, $null_sha1);
+	}
+
+	my $wt_sha1 = Git::command_oneline('hash-object', $file);
+	my $use = ($sha1 eq $null_sha1) || ($sha1 eq $wt_sha1);
+	return ($use, $wt_sha1);
+}
+
+sub changed_files
+{
+	my ($repo_path, $index, $worktree) = @_;
+	$ENV{GIT_INDEX_FILE} = $index;
+
+	my @gitargs = ('--git-dir', $repo_path, '--work-tree', $worktree);
+	my @refreshargs = (
+		@gitargs, 'update-index',
+		'--really-refresh', '-q', '--unmerged');
+	try {
+		Git::command_oneline(@refreshargs);
+	} catch Git::Error::Command with {};
+
+	my @diffargs = (@gitargs, 'diff-files', '--name-only', '-z');
+	my $line = Git::command_oneline(@diffargs);
+	my @files;
+	if (defined $line) {
+		@files = split('\0', $line);
+	} else {
+		@files = ();
+	}
+
+	delete($ENV{GIT_INDEX_FILE});
+
+	return map { $_ => 1 } @files;
+}
+
+sub setup_dir_diff
+{
+	my ($worktree, $symlinks) = @_;
+	my @gitargs = ('diff', '--raw', '--no-abbrev', '-z', @ARGV);
+	my $diffrtn = Git::command_oneline(@gitargs);
+	exit(0) unless defined($diffrtn);
+
+	# Go to the root of the worktree now that we've captured the list of
+	# changed files.  The paths returned by diff --raw are relative to the
+	# top-level of the repository, but we defer changing directories so
+	# that @ARGV can perform pathspec limiting in the current directory.
+	chdir($worktree);
+
+	# Build index info for left and right sides of the diff
+	my $submodule_mode = '160000';
+	my $symlink_mode = '120000';
+	my $null_mode = '0' x 6;
+	my $null_sha1 = '0' x 40;
+	my $lindex = '';
+	my $rindex = '';
+	my $wtindex = '';
+	my %submodule;
+	my %symlink;
+	my @files = ();
+	my %working_tree_dups = ();
+	my @rawdiff = split('\0', $diffrtn);
+
+	my $i = 0;
+	while ($i < $#rawdiff) {
+		if ($rawdiff[$i] =~ /^::/) {
+			warn __ <<'EOF';
+Combined diff formats ('-c' and '--cc') are not supported in
+directory diff mode ('-d' and '--dir-diff').
+EOF
+			exit(1);
+		}
+
+		my ($lmode, $rmode, $lsha1, $rsha1, $status) =
+			split(' ', substr($rawdiff[$i], 1));
+		my $src_path = $rawdiff[$i + 1];
+		my $dst_path;
+
+		if ($status =~ /^[CR]/) {
+			$dst_path = $rawdiff[$i + 2];
+			$i += 3;
+		} else {
+			$dst_path = $src_path;
+			$i += 2;
+		}
+
+		if ($lmode eq $submodule_mode or $rmode eq $submodule_mode) {
+			$submodule{$src_path}{left} = $lsha1;
+			if ($lsha1 ne $rsha1) {
+				$submodule{$dst_path}{right} = $rsha1;
+			} else {
+				$submodule{$dst_path}{right} = "$rsha1-dirty";
+			}
+			next;
+		}
+
+		if ($lmode eq $symlink_mode) {
+			$symlink{$src_path}{left} =
+				Git::command_oneline('show', $lsha1);
+		}
+
+		if ($rmode eq $symlink_mode) {
+			$symlink{$dst_path}{right} =
+				Git::command_oneline('show', $rsha1);
+		}
+
+		if ($lmode ne $null_mode and $status !~ /^C/) {
+			$lindex .= "$lmode $lsha1\t$src_path\0";
+		}
+
+		if ($rmode ne $null_mode) {
+			# Avoid duplicate entries
+			if ($working_tree_dups{$dst_path}++) {
+				next;
+			}
+			my ($use, $wt_sha1) =
+				use_wt_file($dst_path, $rsha1);
+			if ($use) {
+				push @files, $dst_path;
+				$wtindex .= "$rmode $wt_sha1\t$dst_path\0";
+			} else {
+				$rindex .= "$rmode $rsha1\t$dst_path\0";
+			}
+		}
+	}
+
+	# Go to the root of the worktree so that the left index files
+	# are properly setup -- the index is toplevel-relative.
+	chdir($worktree);
+
+	# Setup temp directories
+	my $tmpdir = tempdir('git-difftool.XXXXX', CLEANUP => 0, TMPDIR => 1);
+	my $ldir = "$tmpdir/left";
+	my $rdir = "$tmpdir/right";
+	mkpath($ldir) or exit_cleanup($tmpdir, 1);
+	mkpath($rdir) or exit_cleanup($tmpdir, 1);
+
+	# Populate the left and right directories based on each index file
+	my ($inpipe, $ctx);
+	$ENV{GIT_INDEX_FILE} = "$tmpdir/lindex";
+	($inpipe, $ctx) =
+		Git::command_input_pipe('update-index', '-z', '--index-info');
+	print($inpipe $lindex);
+	Git::command_close_pipe($inpipe, $ctx);
+
+	my $rc = system('git', 'checkout-index', '--all', "--prefix=$ldir/");
+	exit_cleanup($tmpdir, $rc) if $rc != 0;
+
+	$ENV{GIT_INDEX_FILE} = "$tmpdir/rindex";
+	($inpipe, $ctx) =
+		Git::command_input_pipe('update-index', '-z', '--index-info');
+	print($inpipe $rindex);
+	Git::command_close_pipe($inpipe, $ctx);
+
+	$rc = system('git', 'checkout-index', '--all', "--prefix=$rdir/");
+	exit_cleanup($tmpdir, $rc) if $rc != 0;
+
+	$ENV{GIT_INDEX_FILE} = "$tmpdir/wtindex";
+	($inpipe, $ctx) =
+		Git::command_input_pipe('update-index', '--info-only', '-z', '--index-info');
+	print($inpipe $wtindex);
+	Git::command_close_pipe($inpipe, $ctx);
+
+	# If $GIT_DIR was explicitly set just for the update/checkout
+	# commands, then it should be unset before continuing.
+	delete($ENV{GIT_INDEX_FILE});
+
+	# Changes in the working tree need special treatment since they are
+	# not part of the index.
+	for my $file (@files) {
+		my $dir = dirname($file);
+		unless (-d "$rdir/$dir") {
+			mkpath("$rdir/$dir") or
+			exit_cleanup($tmpdir, 1);
+		}
+		if ($symlinks) {
+			symlink("$worktree/$file", "$rdir/$file") or
+			exit_cleanup($tmpdir, 1);
+		} else {
+			copy($file, "$rdir/$file") or
+			exit_cleanup($tmpdir, 1);
+
+			my $mode = stat($file)->mode;
+			chmod($mode, "$rdir/$file") or
+			exit_cleanup($tmpdir, 1);
+		}
+	}
+
+	# Changes to submodules require special treatment. This loop writes a
+	# temporary file to both the left and right directories to show the
+	# change in the recorded SHA1 for the submodule.
+	for my $path (keys %submodule) {
+		my $ok = 0;
+		if (defined($submodule{$path}{left})) {
+			$ok = write_to_file("$ldir/$path",
+				"Subproject commit $submodule{$path}{left}");
+		}
+		if (defined($submodule{$path}{right})) {
+			$ok = write_to_file("$rdir/$path",
+				"Subproject commit $submodule{$path}{right}");
+		}
+		exit_cleanup($tmpdir, 1) if not $ok;
+	}
+
+	# Symbolic links require special treatment. The standard "git diff"
+	# shows only the link itself, not the contents of the link target.
+	# This loop replicates that behavior.
+	for my $path (keys %symlink) {
+		my $ok = 0;
+		if (defined($symlink{$path}{left})) {
+			$ok = write_to_file("$ldir/$path",
+					$symlink{$path}{left});
+		}
+		if (defined($symlink{$path}{right})) {
+			$ok = write_to_file("$rdir/$path",
+					$symlink{$path}{right});
+		}
+		exit_cleanup($tmpdir, 1) if not $ok;
+	}
+
+	return ($ldir, $rdir, $tmpdir, @files);
+}
+
+sub write_to_file
+{
+	my $path = shift;
+	my $value = shift;
+
+	# Make sure the path to the file exists
+	my $dir = dirname($path);
+	unless (-d "$dir") {
+		mkpath("$dir") or return 0;
+	}
+
+	# If the file already exists in that location, delete it.  This
+	# is required in the case of symbolic links.
+	unlink($path);
+
+	open(my $fh, '>', $path) or return 0;
+	print($fh $value);
+	close($fh);
+
+	return 1;
+}
+
+sub main
+{
+	# parse command-line options. all unrecognized options and arguments
+	# are passed through to the 'git diff' command.
+	my %opts = (
+		difftool_cmd => undef,
+		dirdiff => undef,
+		extcmd => undef,
+		gui => undef,
+		help => undef,
+		prompt => undef,
+		symlinks => $^O ne 'cygwin' &&
+				$^O ne 'MSWin32' && $^O ne 'msys',
+		tool_help => undef,
+		trust_exit_code => undef,
+	);
+	GetOptions('g|gui!' => \$opts{gui},
+		'd|dir-diff' => \$opts{dirdiff},
+		'h' => \$opts{help},
+		'prompt!' => \$opts{prompt},
+		'y' => sub { $opts{prompt} = 0; },
+		'symlinks' => \$opts{symlinks},
+		'no-symlinks' => sub { $opts{symlinks} = 0; },
+		't|tool:s' => \$opts{difftool_cmd},
+		'tool-help' => \$opts{tool_help},
+		'trust-exit-code' => \$opts{trust_exit_code},
+		'no-trust-exit-code' => sub { $opts{trust_exit_code} = 0; },
+		'x|extcmd:s' => \$opts{extcmd});
+
+	if (defined($opts{help})) {
+		usage(0);
+	}
+	if (defined($opts{tool_help})) {
+		print_tool_help();
+	}
+	if (defined($opts{difftool_cmd})) {
+		if (length($opts{difftool_cmd}) > 0) {
+			$ENV{GIT_DIFF_TOOL} = $opts{difftool_cmd};
+		} else {
+			print __("No <tool> given for --tool=<tool>\n");
+			usage(1);
+		}
+	}
+	if (defined($opts{extcmd})) {
+		if (length($opts{extcmd}) > 0) {
+			$ENV{GIT_DIFFTOOL_EXTCMD} = $opts{extcmd};
+		} else {
+			print __("No <cmd> given for --extcmd=<cmd>\n");
+			usage(1);
+		}
+	}
+	if ($opts{gui}) {
+		my $guitool = Git::config('diff.guitool');
+		if (defined($guitool) && length($guitool) > 0) {
+			$ENV{GIT_DIFF_TOOL} = $guitool;
+		}
+	}
+
+	if (!defined $opts{trust_exit_code}) {
+		$opts{trust_exit_code} = Git::config_bool('difftool.trustExitCode');
+	}
+	if ($opts{trust_exit_code}) {
+		$ENV{GIT_DIFFTOOL_TRUST_EXIT_CODE} = 'true';
+	} else {
+		$ENV{GIT_DIFFTOOL_TRUST_EXIT_CODE} = 'false';
+	}
+
+	# In directory diff mode, 'git-difftool--helper' is called once
+	# to compare the a/b directories.  In file diff mode, 'git diff'
+	# will invoke a separate instance of 'git-difftool--helper' for
+	# each file that changed.
+	if (defined($opts{dirdiff})) {
+		dir_diff($opts{extcmd}, $opts{symlinks});
+	} else {
+		file_diff($opts{prompt});
+	}
+}
+
+sub dir_diff
+{
+	my ($extcmd, $symlinks) = @_;
+	my $rc;
+	my $error = 0;
+	my $repo = Git->repository();
+	my $repo_path = $repo->repo_path();
+	my $worktree = $repo->wc_path();
+	$worktree =~ s|/$||; # Avoid double slashes in symlink targets
+	my ($a, $b, $tmpdir, @files) = setup_dir_diff($worktree, $symlinks);
+
+	if (defined($extcmd)) {
+		$rc = system($extcmd, $a, $b);
+	} else {
+		$ENV{GIT_DIFFTOOL_DIRDIFF} = 'true';
+		$rc = system('git', 'difftool--helper', $a, $b);
+	}
+	# If the diff including working copy files and those
+	# files were modified during the diff, then the changes
+	# should be copied back to the working tree.
+	# Do not copy back files when symlinks are used and the
+	# external tool did not replace the original link with a file.
+	#
+	# These hashes are loaded lazily since they aren't needed
+	# in the common case of --symlinks and the difftool updating
+	# files through the symlink.
+	my %wt_modified;
+	my %tmp_modified;
+	my $indices_loaded = 0;
+
+	for my $file (@files) {
+		next if $symlinks && -l "$b/$file";
+		next if ! -f "$b/$file";
+
+		if (!$indices_loaded) {
+			%wt_modified = changed_files(
+				$repo_path, "$tmpdir/wtindex", $worktree);
+			%tmp_modified = changed_files(
+				$repo_path, "$tmpdir/wtindex", $b);
+			$indices_loaded = 1;
+		}
+
+		if (exists $wt_modified{$file} and exists $tmp_modified{$file}) {
+			warn sprintf(__(
+				"warning: Both files modified:\n" .
+				"'%s/%s' and '%s/%s'.\n" .
+				"warning: Working tree file has been left.\n" .
+				"warning:\n"), $worktree, $file, $b, $file);
+			$error = 1;
+		} elsif (exists $tmp_modified{$file}) {
+			my $mode = stat("$b/$file")->mode;
+			copy("$b/$file", $file) or
+			exit_cleanup($tmpdir, 1);
+
+			chmod($mode, $file) or
+			exit_cleanup($tmpdir, 1);
+		}
+	}
+	if ($error) {
+		warn sprintf(__(
+			"warning: Temporary files exist in '%s'.\n" .
+			"warning: You may want to cleanup or recover these.\n"), $tmpdir);
+		exit(1);
+	} else {
+		exit_cleanup($tmpdir, $rc);
+	}
+}
+
+sub file_diff
+{
+	my ($prompt) = @_;
+
+	if (defined($prompt)) {
+		if ($prompt) {
+			$ENV{GIT_DIFFTOOL_PROMPT} = 'true';
+		} else {
+			$ENV{GIT_DIFFTOOL_NO_PROMPT} = 'true';
+		}
+	}
+
+	$ENV{GIT_PAGER} = '';
+	$ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
+
+	# ActiveState Perl for Win32 does not implement POSIX semantics of
+	# exec* system call. It just spawns the given executable and finishes
+	# the starting program, exiting with code 0.
+	# system will at least catch the errors returned by git diff,
+	# allowing the caller of git difftool better handling of failures.
+	my $rc = system('git', 'diff', @ARGV);
+	exit($rc | ($rc >> 8));
+}
+
+main();
diff --git a/contrib/gitview/gitview b/contrib/gitview/gitview
deleted file mode 100755
index 4e23c650fe..0000000000
--- a/contrib/gitview/gitview
+++ /dev/null
@@ -1,1305 +0,0 @@
-#! /usr/bin/env python
-
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-
-""" gitview
-GUI browser for git repository
-This program is based on bzrk by Scott James Remnant <scott@ubuntu.com>
-"""
-__copyright__ = "Copyright (C) 2006 Hewlett-Packard Development Company, L.P."
-__copyright__ = "Copyright (C) 2007 Aneesh Kumar K.V <aneesh.kumar@gmail.com"
-__author__    = "Aneesh Kumar K.V <aneesh.kumar@gmail.com>"
-
-
-import sys
-import os
-import gtk
-import pygtk
-import pango
-import re
-import time
-import gobject
-import cairo
-import math
-import string
-import fcntl
-
-have_gtksourceview2 = False
-have_gtksourceview = False
-try:
-    import gtksourceview2
-    have_gtksourceview2 = True
-except ImportError:
-    try:
-        import gtksourceview
-        have_gtksourceview = True
-    except ImportError:
-        print "Running without gtksourceview2 or gtksourceview module"
-
-re_ident = re.compile('(author|committer) (?P<ident>.*) (?P<epoch>\d+) (?P<tz>[+-]\d{4})')
-
-def list_to_string(args, skip):
-	count = len(args)
-	i = skip
-	str_arg=" "
-	while (i < count ):
-		str_arg = str_arg + args[i]
-		str_arg = str_arg + " "
-		i = i+1
-
-	return str_arg
-
-def show_date(epoch, tz):
-	secs = float(epoch)
-	tzsecs = float(tz[1:3]) * 3600
-	tzsecs += float(tz[3:5]) * 60
-	if (tz[0] == "+"):
-		secs += tzsecs
-	else:
-		secs -= tzsecs
-
-	return time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime(secs))
-
-def get_source_buffer_and_view():
-	if have_gtksourceview2:
-		buffer = gtksourceview2.Buffer()
-		slm = gtksourceview2.LanguageManager()
-		gsl = slm.get_language("diff")
-		buffer.set_highlight_syntax(True)
-		buffer.set_language(gsl)
-		view = gtksourceview2.View(buffer)
-	elif have_gtksourceview:
-		buffer = gtksourceview.SourceBuffer()
-		slm = gtksourceview.SourceLanguagesManager()
-		gsl = slm.get_language_from_mime_type("text/x-patch")
-		buffer.set_highlight(True)
-		buffer.set_language(gsl)
-		view = gtksourceview.SourceView(buffer)
-	else:
-		buffer = gtk.TextBuffer()
-		view = gtk.TextView(buffer)
-	return (buffer, view)
-
-
-class CellRendererGraph(gtk.GenericCellRenderer):
-	"""Cell renderer for directed graph.
-
-	This module contains the implementation of a custom GtkCellRenderer that
-	draws part of the directed graph based on the lines suggested by the code
-	in graph.py.
-
-	Because we're shiny, we use Cairo to do this, and because we're naughty
-	we cheat and draw over the bits of the TreeViewColumn that are supposed to
-	just be for the background.
-
-	Properties:
-	node              (column, colour, [ names ]) tuple to draw revision node,
-	in_lines          (start, end, colour) tuple list to draw inward lines,
-	out_lines         (start, end, colour) tuple list to draw outward lines.
-	"""
-
-	__gproperties__ = {
-	"node":         ( gobject.TYPE_PYOBJECT, "node",
-			  "revision node instruction",
-			  gobject.PARAM_WRITABLE
-			),
-	"in-lines":     ( gobject.TYPE_PYOBJECT, "in-lines",
-			  "instructions to draw lines into the cell",
-			  gobject.PARAM_WRITABLE
-			),
-	"out-lines":    ( gobject.TYPE_PYOBJECT, "out-lines",
-			  "instructions to draw lines out of the cell",
-			  gobject.PARAM_WRITABLE
-			),
-	}
-
-	def do_set_property(self, property, value):
-		"""Set properties from GObject properties."""
-		if property.name == "node":
-			self.node = value
-		elif property.name == "in-lines":
-			self.in_lines = value
-		elif property.name == "out-lines":
-			self.out_lines = value
-		else:
-			raise AttributeError, "no such property: '%s'" % property.name
-
-	def box_size(self, widget):
-		"""Calculate box size based on widget's font.
-
-		Cache this as it's probably expensive to get.  It ensures that we
-		draw the graph at least as large as the text.
-		"""
-		try:
-			return self._box_size
-		except AttributeError:
-			pango_ctx = widget.get_pango_context()
-			font_desc = widget.get_style().font_desc
-			metrics = pango_ctx.get_metrics(font_desc)
-
-			ascent = pango.PIXELS(metrics.get_ascent())
-			descent = pango.PIXELS(metrics.get_descent())
-
-			self._box_size = ascent + descent + 6
-			return self._box_size
-
-	def set_colour(self, ctx, colour, bg, fg):
-		"""Set the context source colour.
-
-		Picks a distinct colour based on an internal wheel; the bg
-		parameter provides the value that should be assigned to the 'zero'
-		colours and the fg parameter provides the multiplier that should be
-		applied to the foreground colours.
-		"""
-		colours = [
-		    ( 1.0, 0.0, 0.0 ),
-		    ( 1.0, 1.0, 0.0 ),
-		    ( 0.0, 1.0, 0.0 ),
-		    ( 0.0, 1.0, 1.0 ),
-		    ( 0.0, 0.0, 1.0 ),
-		    ( 1.0, 0.0, 1.0 ),
-		    ]
-
-		colour %= len(colours)
-		red   = (colours[colour][0] * fg) or bg
-		green = (colours[colour][1] * fg) or bg
-		blue  = (colours[colour][2] * fg) or bg
-
-		ctx.set_source_rgb(red, green, blue)
-
-	def on_get_size(self, widget, cell_area):
-		"""Return the size we need for this cell.
-
-		Each cell is drawn individually and is only as wide as it needs
-		to be, we let the TreeViewColumn take care of making them all
-		line up.
-		"""
-		box_size = self.box_size(widget)
-
-		cols = self.node[0]
-		for start, end, colour in self.in_lines + self.out_lines:
-			cols = int(max(cols, start, end))
-
-		(column, colour, names) = self.node
-		names_len = 0
-		if (len(names) != 0):
-			for item in names:
-				names_len += len(item)
-
-		width = box_size * (cols + 1 ) + names_len
-		height = box_size
-
-		# FIXME I have no idea how to use cell_area properly
-		return (0, 0, width, height)
-
-	def on_render(self, window, widget, bg_area, cell_area, exp_area, flags):
-		"""Render an individual cell.
-
-		Draws the cell contents using cairo, taking care to clip what we
-		do to within the background area so we don't draw over other cells.
-		Note that we're a bit naughty there and should really be drawing
-		in the cell_area (or even the exposed area), but we explicitly don't
-		want any gutter.
-
-		We try and be a little clever, if the line we need to draw is going
-		to cross other columns we actually draw it as in the .---' style
-		instead of a pure diagonal ... this reduces confusion by an
-		incredible amount.
-		"""
-		ctx = window.cairo_create()
-		ctx.rectangle(bg_area.x, bg_area.y, bg_area.width, bg_area.height)
-		ctx.clip()
-
-		box_size = self.box_size(widget)
-
-		ctx.set_line_width(box_size / 8)
-		ctx.set_line_cap(cairo.LINE_CAP_SQUARE)
-
-		# Draw lines into the cell
-		for start, end, colour in self.in_lines:
-			ctx.move_to(cell_area.x + box_size * start + box_size / 2,
-					bg_area.y - bg_area.height / 2)
-
-			if start - end > 1:
-				ctx.line_to(cell_area.x + box_size * start, bg_area.y)
-				ctx.line_to(cell_area.x + box_size * end + box_size, bg_area.y)
-			elif start - end < -1:
-				ctx.line_to(cell_area.x + box_size * start + box_size,
-						bg_area.y)
-				ctx.line_to(cell_area.x + box_size * end, bg_area.y)
-
-			ctx.line_to(cell_area.x + box_size * end + box_size / 2,
-					bg_area.y + bg_area.height / 2)
-
-			self.set_colour(ctx, colour, 0.0, 0.65)
-			ctx.stroke()
-
-		# Draw lines out of the cell
-		for start, end, colour in self.out_lines:
-			ctx.move_to(cell_area.x + box_size * start + box_size / 2,
-					bg_area.y + bg_area.height / 2)
-
-			if start - end > 1:
-				ctx.line_to(cell_area.x + box_size * start,
-						bg_area.y + bg_area.height)
-				ctx.line_to(cell_area.x + box_size * end + box_size,
-						bg_area.y + bg_area.height)
-			elif start - end < -1:
-				ctx.line_to(cell_area.x + box_size * start + box_size,
-						bg_area.y + bg_area.height)
-				ctx.line_to(cell_area.x + box_size * end,
-						bg_area.y + bg_area.height)
-
-			ctx.line_to(cell_area.x + box_size * end + box_size / 2,
-					bg_area.y + bg_area.height / 2 + bg_area.height)
-
-			self.set_colour(ctx, colour, 0.0, 0.65)
-			ctx.stroke()
-
-		# Draw the revision node in the right column
-		(column, colour, names) = self.node
-		ctx.arc(cell_area.x + box_size * column + box_size / 2,
-				cell_area.y + cell_area.height / 2,
-				box_size / 4, 0, 2 * math.pi)
-
-
-		self.set_colour(ctx, colour, 0.0, 0.5)
-		ctx.stroke_preserve()
-
-		self.set_colour(ctx, colour, 0.5, 1.0)
-		ctx.fill_preserve()
-
-		if (len(names) != 0):
-			name = " "
-			for item in names:
-				name = name + item + " "
-
-			ctx.set_font_size(13)
-			if (flags & 1):
-				self.set_colour(ctx, colour, 0.5, 1.0)
-			else:
-				self.set_colour(ctx, colour, 0.0, 0.5)
-			ctx.show_text(name)
-
-class Commit(object):
-	""" This represent a commit object obtained after parsing the git-rev-list
-	output """
-
-	__slots__ = ['children_sha1', 'message', 'author', 'date', 'committer',
-				 'commit_date', 'commit_sha1', 'parent_sha1']
-
-	children_sha1 = {}
-
-	def __init__(self, commit_lines):
-		self.message		= ""
-		self.author		= ""
-		self.date		= ""
-		self.committer		= ""
-		self.commit_date	= ""
-		self.commit_sha1	= ""
-		self.parent_sha1	= [ ]
-		self.parse_commit(commit_lines)
-
-
-	def parse_commit(self, commit_lines):
-
-		# First line is the sha1 lines
-		line = string.strip(commit_lines[0])
-		sha1 = re.split(" ", line)
-		self.commit_sha1 = sha1[0]
-		self.parent_sha1 = sha1[1:]
-
-		#build the child list
-		for parent_id in self.parent_sha1:
-			try:
-				Commit.children_sha1[parent_id].append(self.commit_sha1)
-			except KeyError:
-				Commit.children_sha1[parent_id] = [self.commit_sha1]
-
-		# IF we don't have parent
-		if (len(self.parent_sha1) == 0):
-			self.parent_sha1 = [0]
-
-		for line in commit_lines[1:]:
-			m = re.match("^ ", line)
-			if (m != None):
-				# First line of the commit message used for short log
-				if self.message == "":
-					self.message = string.strip(line)
-				continue
-
-			m = re.match("tree", line)
-			if (m != None):
-				continue
-
-			m = re.match("parent", line)
-			if (m != None):
-				continue
-
-			m = re_ident.match(line)
-			if (m != None):
-				date = show_date(m.group('epoch'), m.group('tz'))
-				if m.group(1) == "author":
-					self.author = m.group('ident')
-					self.date = date
-				elif m.group(1) == "committer":
-					self.committer = m.group('ident')
-					self.commit_date = date
-
-				continue
-
-	def get_message(self, with_diff=0):
-		if (with_diff == 1):
-			message = self.diff_tree()
-		else:
-			fp = os.popen("git cat-file commit " + self.commit_sha1)
-			message = fp.read()
-			fp.close()
-
-		return message
-
-	def diff_tree(self):
-		fp = os.popen("git diff-tree --pretty --cc  -v -p --always " +  self.commit_sha1)
-		diff = fp.read()
-		fp.close()
-		return diff
-
-class AnnotateWindow(object):
-	"""Annotate window.
-	This object represents and manages a single window containing the
-	annotate information of the file
-	"""
-
-	def __init__(self):
-		self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
-		self.window.set_border_width(0)
-		self.window.set_title("Git repository browser annotation window")
-		self.prev_read = ""
-
-		# Use two thirds of the screen by default
-		screen = self.window.get_screen()
-		monitor = screen.get_monitor_geometry(0)
-		width = int(monitor.width * 0.66)
-		height = int(monitor.height * 0.66)
-		self.window.set_default_size(width, height)
-
-	def add_file_data(self, filename, commit_sha1, line_num):
-		fp = os.popen("git cat-file blob " + commit_sha1 +":"+filename)
-		i = 1;
-		for line in fp.readlines():
-			line = string.rstrip(line)
-			self.model.append(None, ["HEAD", filename, line, i])
-			i = i+1
-		fp.close()
-
-		# now set the cursor position
-		self.treeview.set_cursor(line_num-1)
-		self.treeview.grab_focus()
-
-	def _treeview_cursor_cb(self, *args):
-		"""Callback for when the treeview cursor changes."""
-		(path, col) = self.treeview.get_cursor()
-		commit_sha1 = self.model[path][0]
-		commit_msg = ""
-		fp = os.popen("git cat-file commit " + commit_sha1)
-		for line in fp.readlines():
-			commit_msg =  commit_msg + line
-		fp.close()
-
-		self.commit_buffer.set_text(commit_msg)
-
-	def _treeview_row_activated(self, *args):
-		"""Callback for when the treeview row gets selected."""
-		(path, col) = self.treeview.get_cursor()
-		commit_sha1 = self.model[path][0]
-		filename    = self.model[path][1]
-		line_num    = self.model[path][3]
-
-		window = AnnotateWindow();
-		fp = os.popen("git rev-parse "+ commit_sha1 + "~1")
-		commit_sha1 = string.strip(fp.readline())
-		fp.close()
-		window.annotate(filename, commit_sha1, line_num)
-
-	def data_ready(self, source, condition):
-		while (1):
-			try :
-				# A simple readline doesn't work
-				# a readline bug ??
-				buffer = source.read(100)
-
-			except:
-				# resource temporary not available
-				return True
-
-			if (len(buffer) == 0):
-				gobject.source_remove(self.io_watch_tag)
-				source.close()
-				return False
-
-			if (self.prev_read != ""):
-				buffer = self.prev_read + buffer
-				self.prev_read = ""
-
-			if (buffer[len(buffer) -1] != '\n'):
-				try:
-					newline_index = buffer.rindex("\n")
-				except ValueError:
-					newline_index = 0
-
-				self.prev_read = buffer[newline_index:(len(buffer))]
-				buffer = buffer[0:newline_index]
-
-			for buff in buffer.split("\n"):
-				annotate_line = re.compile('^([0-9a-f]{40}) (.+) (.+) (.+)$')
-				m = annotate_line.match(buff)
-				if not m:
-					annotate_line = re.compile('^(filename) (.+)$')
-					m = annotate_line.match(buff)
-					if not m:
-						continue
-					filename = m.group(2)
-				else:
-					self.commit_sha1 = m.group(1)
-					self.source_line = int(m.group(2))
-					self.result_line = int(m.group(3))
-					self.count	    = int(m.group(4))
-					#set the details only when we have the file name
-					continue
-
-				while (self.count > 0):
-					# set at result_line + count-1 the sha1 as commit_sha1
-					self.count = self.count - 1
-					iter = self.model.iter_nth_child(None, self.result_line + self.count-1)
-					self.model.set(iter, 0, self.commit_sha1, 1, filename, 3, self.source_line)
-
-
-	def annotate(self, filename, commit_sha1, line_num):
-		# verify the commit_sha1 specified has this filename
-
-		fp = os.popen("git ls-tree "+ commit_sha1 + " -- " + filename)
-		line = string.strip(fp.readline())
-		if line == '':
-			# pop up the message the file is not there as a part of the commit
-			fp.close()
-			dialog = gtk.MessageDialog(parent=None, flags=0,
-					type=gtk.MESSAGE_WARNING, buttons=gtk.BUTTONS_CLOSE,
-					message_format=None)
-			dialog.set_markup("The file %s is not present in the parent commit %s" % (filename, commit_sha1))
-			dialog.run()
-			dialog.destroy()
-			return
-
-		fp.close()
-
-		vpan = gtk.VPaned();
-		self.window.add(vpan);
-		vpan.show()
-
-		scrollwin = gtk.ScrolledWindow()
-		scrollwin.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
-		scrollwin.set_shadow_type(gtk.SHADOW_IN)
-		vpan.pack1(scrollwin, True, True);
-		scrollwin.show()
-
-		self.model = gtk.TreeStore(str, str, str, int)
-		self.treeview = gtk.TreeView(self.model)
-		self.treeview.set_rules_hint(True)
-		self.treeview.set_search_column(0)
-		self.treeview.connect("cursor-changed", self._treeview_cursor_cb)
-		self.treeview.connect("row-activated", self._treeview_row_activated)
-		scrollwin.add(self.treeview)
-		self.treeview.show()
-
-		cell = gtk.CellRendererText()
-		cell.set_property("width-chars", 10)
-		cell.set_property("ellipsize", pango.ELLIPSIZE_END)
-		column = gtk.TreeViewColumn("Commit")
-		column.set_resizable(True)
-		column.pack_start(cell, expand=True)
-		column.add_attribute(cell, "text", 0)
-		self.treeview.append_column(column)
-
-		cell = gtk.CellRendererText()
-		cell.set_property("width-chars", 20)
-		cell.set_property("ellipsize", pango.ELLIPSIZE_END)
-		column = gtk.TreeViewColumn("File Name")
-		column.set_resizable(True)
-		column.pack_start(cell, expand=True)
-		column.add_attribute(cell, "text", 1)
-		self.treeview.append_column(column)
-
-		cell = gtk.CellRendererText()
-		cell.set_property("width-chars", 20)
-		cell.set_property("ellipsize", pango.ELLIPSIZE_END)
-		column = gtk.TreeViewColumn("Data")
-		column.set_resizable(True)
-		column.pack_start(cell, expand=True)
-		column.add_attribute(cell, "text", 2)
-		self.treeview.append_column(column)
-
-		# The commit message window
-		scrollwin = gtk.ScrolledWindow()
-		scrollwin.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
-		scrollwin.set_shadow_type(gtk.SHADOW_IN)
-		vpan.pack2(scrollwin, True, True);
-		scrollwin.show()
-
-		commit_text = gtk.TextView()
-		self.commit_buffer = gtk.TextBuffer()
-		commit_text.set_buffer(self.commit_buffer)
-		scrollwin.add(commit_text)
-		commit_text.show()
-
-		self.window.show()
-
-		self.add_file_data(filename, commit_sha1, line_num)
-
-		fp = os.popen("git blame --incremental -C -C -- " + filename + " " + commit_sha1)
-		flags = fcntl.fcntl(fp.fileno(), fcntl.F_GETFL)
-		fcntl.fcntl(fp.fileno(), fcntl.F_SETFL, flags | os.O_NONBLOCK)
-		self.io_watch_tag = gobject.io_add_watch(fp, gobject.IO_IN, self.data_ready)
-
-
-class DiffWindow(object):
-	"""Diff window.
-	This object represents and manages a single window containing the
-	differences between two revisions on a branch.
-	"""
-
-	def __init__(self):
-		self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
-		self.window.set_border_width(0)
-		self.window.set_title("Git repository browser diff window")
-
-		# Use two thirds of the screen by default
-		screen = self.window.get_screen()
-		monitor = screen.get_monitor_geometry(0)
-		width = int(monitor.width * 0.66)
-		height = int(monitor.height * 0.66)
-		self.window.set_default_size(width, height)
-
-
-		self.construct()
-
-	def construct(self):
-		"""Construct the window contents."""
-		vbox = gtk.VBox()
-		self.window.add(vbox)
-		vbox.show()
-
-		menu_bar = gtk.MenuBar()
-		save_menu = gtk.ImageMenuItem(gtk.STOCK_SAVE)
-		save_menu.connect("activate", self.save_menu_response, "save")
-		save_menu.show()
-		menu_bar.append(save_menu)
-		vbox.pack_start(menu_bar, expand=False, fill=True)
-		menu_bar.show()
-
-		hpan = gtk.HPaned()
-
-		scrollwin = gtk.ScrolledWindow()
-		scrollwin.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
-		scrollwin.set_shadow_type(gtk.SHADOW_IN)
-		hpan.pack1(scrollwin, True, True)
-		scrollwin.show()
-
-		(self.buffer, sourceview) = get_source_buffer_and_view()
-
-		sourceview.set_editable(False)
-		sourceview.modify_font(pango.FontDescription("Monospace"))
-		scrollwin.add(sourceview)
-		sourceview.show()
-
-		# The file hierarchy: a scrollable treeview
-		scrollwin = gtk.ScrolledWindow()
-		scrollwin.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
-		scrollwin.set_shadow_type(gtk.SHADOW_IN)
-		scrollwin.set_size_request(20, -1)
-		hpan.pack2(scrollwin, True, True)
-		scrollwin.show()
-
-		self.model = gtk.TreeStore(str, str, str)
-		self.treeview = gtk.TreeView(self.model)
-		self.treeview.set_search_column(1)
-		self.treeview.connect("cursor-changed", self._treeview_clicked)
-		scrollwin.add(self.treeview)
-		self.treeview.show()
-
-		cell = gtk.CellRendererText()
-		cell.set_property("width-chars", 20)
-		column = gtk.TreeViewColumn("Select to annotate")
-		column.pack_start(cell, expand=True)
-		column.add_attribute(cell, "text", 0)
-		self.treeview.append_column(column)
-
-		vbox.pack_start(hpan, expand=True, fill=True)
-		hpan.show()
-
-	def _treeview_clicked(self, *args):
-		"""Callback for when the treeview cursor changes."""
-		(path, col) = self.treeview.get_cursor()
-		specific_file = self.model[path][1]
-		commit_sha1 =  self.model[path][2]
-		if specific_file ==  None :
-			return
-		elif specific_file ==  "" :
-			specific_file =  None
-
-		window = AnnotateWindow();
-		window.annotate(specific_file, commit_sha1, 1)
-
-
-	def commit_files(self, commit_sha1, parent_sha1):
-		self.model.clear()
-		add  = self.model.append(None, [ "Added", None, None])
-		dele = self.model.append(None, [ "Deleted", None, None])
-		mod  = self.model.append(None, [ "Modified", None, None])
-		diff_tree = re.compile('^(:.{6}) (.{6}) (.{40}) (.{40}) (A|D|M)\s(.+)$')
-		fp = os.popen("git diff-tree -r --no-commit-id " + parent_sha1 + " " + commit_sha1)
-		while 1:
-			line = string.strip(fp.readline())
-			if line == '':
-				break
-			m = diff_tree.match(line)
-			if not m:
-				continue
-
-			attr = m.group(5)
-			filename = m.group(6)
-			if attr == "A":
-				self.model.append(add,  [filename, filename, commit_sha1])
-			elif attr == "D":
-				self.model.append(dele, [filename, filename, commit_sha1])
-			elif attr == "M":
-				self.model.append(mod,  [filename, filename, commit_sha1])
-		fp.close()
-
-		self.treeview.expand_all()
-
-	def set_diff(self, commit_sha1, parent_sha1, encoding):
-		"""Set the differences showed by this window.
-		Compares the two trees and populates the window with the
-		differences.
-		"""
-		# Diff with the first commit or the last commit shows nothing
-		if (commit_sha1 == 0 or parent_sha1 == 0 ):
-			return
-
-		fp = os.popen("git diff-tree -p " + parent_sha1 + " " + commit_sha1)
-		self.buffer.set_text(unicode(fp.read(), encoding).encode('utf-8'))
-		fp.close()
-		self.commit_files(commit_sha1, parent_sha1)
-		self.window.show()
-
-	def save_menu_response(self, widget, string):
-		dialog = gtk.FileChooserDialog("Save..", None, gtk.FILE_CHOOSER_ACTION_SAVE,
-				(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
-					gtk.STOCK_SAVE, gtk.RESPONSE_OK))
-		dialog.set_default_response(gtk.RESPONSE_OK)
-		response = dialog.run()
-		if response == gtk.RESPONSE_OK:
-			patch_buffer = self.buffer.get_text(self.buffer.get_start_iter(),
-					self.buffer.get_end_iter())
-			fp = open(dialog.get_filename(), "w")
-			fp.write(patch_buffer)
-			fp.close()
-		dialog.destroy()
-
-class GitView(object):
-	""" This is the main class
-	"""
-	version = "0.9"
-
-	def __init__(self, with_diff=0):
-		self.with_diff = with_diff
-		self.window =	gtk.Window(gtk.WINDOW_TOPLEVEL)
-		self.window.set_border_width(0)
-		self.window.set_title("Git repository browser")
-
-		self.get_encoding()
-		self.get_bt_sha1()
-
-		# Use three-quarters of the screen by default
-		screen = self.window.get_screen()
-		monitor = screen.get_monitor_geometry(0)
-		width = int(monitor.width * 0.75)
-		height = int(monitor.height * 0.75)
-		self.window.set_default_size(width, height)
-
-		# FIXME AndyFitz!
-		icon = self.window.render_icon(gtk.STOCK_INDEX, gtk.ICON_SIZE_BUTTON)
-		self.window.set_icon(icon)
-
-		self.accel_group = gtk.AccelGroup()
-		self.window.add_accel_group(self.accel_group)
-		self.accel_group.connect_group(0xffc2, 0, gtk.ACCEL_LOCKED, self.refresh);
-		self.accel_group.connect_group(0xffc1, 0, gtk.ACCEL_LOCKED, self.maximize);
-		self.accel_group.connect_group(0xffc8, 0, gtk.ACCEL_LOCKED, self.fullscreen);
-		self.accel_group.connect_group(0xffc9, 0, gtk.ACCEL_LOCKED, self.unfullscreen);
-
-		self.window.add(self.construct())
-
-	def refresh(self, widget, event=None, *arguments, **keywords):
-		self.get_encoding()
-		self.get_bt_sha1()
-		Commit.children_sha1 = {}
-		self.set_branch(sys.argv[without_diff:])
-		self.window.show()
-		return True
-
-	def maximize(self, widget, event=None, *arguments, **keywords):
-		self.window.maximize()
-		return True
-
-	def fullscreen(self, widget, event=None, *arguments, **keywords):
-		self.window.fullscreen()
-		return True
-
-	def unfullscreen(self, widget, event=None, *arguments, **keywords):
-		self.window.unfullscreen()
-		return True
-
-	def get_bt_sha1(self):
-		""" Update the bt_sha1 dictionary with the
-		respective sha1 details """
-
-		self.bt_sha1 = { }
-		ls_remote = re.compile('^(.{40})\trefs/([^^]+)(?:\\^(..))?$');
-		fp = os.popen('git ls-remote "${GIT_DIR-.git}"')
-		while 1:
-			line = string.strip(fp.readline())
-			if line == '':
-				break
-			m = ls_remote.match(line)
-			if not m:
-				continue
-			(sha1, name) = (m.group(1), m.group(2))
-			if not self.bt_sha1.has_key(sha1):
-				self.bt_sha1[sha1] = []
-			self.bt_sha1[sha1].append(name)
-		fp.close()
-
-	def get_encoding(self):
-		fp = os.popen("git config --get i18n.commitencoding")
-		self.encoding=string.strip(fp.readline())
-		fp.close()
-		if (self.encoding == ""):
-			self.encoding = "utf-8"
-
-
-	def construct(self):
-		"""Construct the window contents."""
-		vbox = gtk.VBox()
-		paned = gtk.VPaned()
-		paned.pack1(self.construct_top(), resize=False, shrink=True)
-		paned.pack2(self.construct_bottom(), resize=False, shrink=True)
-		menu_bar = gtk.MenuBar()
-		menu_bar.set_pack_direction(gtk.PACK_DIRECTION_RTL)
-		help_menu = gtk.MenuItem("Help")
-		menu = gtk.Menu()
-		about_menu = gtk.MenuItem("About")
-		menu.append(about_menu)
-		about_menu.connect("activate", self.about_menu_response, "about")
-		about_menu.show()
-		help_menu.set_submenu(menu)
-		help_menu.show()
-		menu_bar.append(help_menu)
-		menu_bar.show()
-		vbox.pack_start(menu_bar, expand=False, fill=True)
-		vbox.pack_start(paned, expand=True, fill=True)
-		paned.show()
-		vbox.show()
-		return vbox
-
-
-	def construct_top(self):
-		"""Construct the top-half of the window."""
-		vbox = gtk.VBox(spacing=6)
-		vbox.set_border_width(12)
-		vbox.show()
-
-
-		scrollwin = gtk.ScrolledWindow()
-		scrollwin.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
-		scrollwin.set_shadow_type(gtk.SHADOW_IN)
-		vbox.pack_start(scrollwin, expand=True, fill=True)
-		scrollwin.show()
-
-		self.treeview = gtk.TreeView()
-		self.treeview.set_rules_hint(True)
-		self.treeview.set_search_column(4)
-		self.treeview.connect("cursor-changed", self._treeview_cursor_cb)
-		scrollwin.add(self.treeview)
-		self.treeview.show()
-
-		cell = CellRendererGraph()
-		column = gtk.TreeViewColumn()
-		column.set_resizable(True)
-		column.pack_start(cell, expand=True)
-		column.add_attribute(cell, "node", 1)
-		column.add_attribute(cell, "in-lines", 2)
-		column.add_attribute(cell, "out-lines", 3)
-		self.treeview.append_column(column)
-
-		cell = gtk.CellRendererText()
-		cell.set_property("width-chars", 65)
-		cell.set_property("ellipsize", pango.ELLIPSIZE_END)
-		column = gtk.TreeViewColumn("Message")
-		column.set_resizable(True)
-		column.pack_start(cell, expand=True)
-		column.add_attribute(cell, "text", 4)
-		self.treeview.append_column(column)
-
-		cell = gtk.CellRendererText()
-		cell.set_property("width-chars", 40)
-		cell.set_property("ellipsize", pango.ELLIPSIZE_END)
-		column = gtk.TreeViewColumn("Author")
-		column.set_resizable(True)
-		column.pack_start(cell, expand=True)
-		column.add_attribute(cell, "text", 5)
-		self.treeview.append_column(column)
-
-		cell = gtk.CellRendererText()
-		cell.set_property("ellipsize", pango.ELLIPSIZE_END)
-		column = gtk.TreeViewColumn("Date")
-		column.set_resizable(True)
-		column.pack_start(cell, expand=True)
-		column.add_attribute(cell, "text", 6)
-		self.treeview.append_column(column)
-
-		return vbox
-
-	def about_menu_response(self, widget, string):
-		dialog = gtk.AboutDialog()
-		dialog.set_name("Gitview")
-		dialog.set_version(GitView.version)
-		dialog.set_authors(["Aneesh Kumar K.V <aneesh.kumar@gmail.com>"])
-		dialog.set_website("http://www.kernel.org/pub/software/scm/git/")
-		dialog.set_copyright("Use and distribute under the terms of the GNU General Public License")
-		dialog.set_wrap_license(True)
-		dialog.run()
-		dialog.destroy()
-
-
-	def construct_bottom(self):
-		"""Construct the bottom half of the window."""
-		vbox = gtk.VBox(False, spacing=6)
-		vbox.set_border_width(12)
-		(width, height) = self.window.get_size()
-		vbox.set_size_request(width, int(height / 2.5))
-		vbox.show()
-
-		self.table = gtk.Table(rows=4, columns=4)
-		self.table.set_row_spacings(6)
-		self.table.set_col_spacings(6)
-		vbox.pack_start(self.table, expand=False, fill=True)
-		self.table.show()
-
-		align = gtk.Alignment(0.0, 0.5)
-		label = gtk.Label()
-		label.set_markup("<b>Revision:</b>")
-		align.add(label)
-		self.table.attach(align, 0, 1, 0, 1, gtk.FILL, gtk.FILL)
-		label.show()
-		align.show()
-
-		align = gtk.Alignment(0.0, 0.5)
-		self.revid_label = gtk.Label()
-		self.revid_label.set_selectable(True)
-		align.add(self.revid_label)
-		self.table.attach(align, 1, 2, 0, 1, gtk.EXPAND | gtk.FILL, gtk.FILL)
-		self.revid_label.show()
-		align.show()
-
-		align = gtk.Alignment(0.0, 0.5)
-		label = gtk.Label()
-		label.set_markup("<b>Committer:</b>")
-		align.add(label)
-		self.table.attach(align, 0, 1, 1, 2, gtk.FILL, gtk.FILL)
-		label.show()
-		align.show()
-
-		align = gtk.Alignment(0.0, 0.5)
-		self.committer_label = gtk.Label()
-		self.committer_label.set_selectable(True)
-		align.add(self.committer_label)
-		self.table.attach(align, 1, 2, 1, 2, gtk.EXPAND | gtk.FILL, gtk.FILL)
-		self.committer_label.show()
-		align.show()
-
-		align = gtk.Alignment(0.0, 0.5)
-		label = gtk.Label()
-		label.set_markup("<b>Timestamp:</b>")
-		align.add(label)
-		self.table.attach(align, 0, 1, 2, 3, gtk.FILL, gtk.FILL)
-		label.show()
-		align.show()
-
-		align = gtk.Alignment(0.0, 0.5)
-		self.timestamp_label = gtk.Label()
-		self.timestamp_label.set_selectable(True)
-		align.add(self.timestamp_label)
-		self.table.attach(align, 1, 2, 2, 3, gtk.EXPAND | gtk.FILL, gtk.FILL)
-		self.timestamp_label.show()
-		align.show()
-
-		align = gtk.Alignment(0.0, 0.5)
-		label = gtk.Label()
-		label.set_markup("<b>Parents:</b>")
-		align.add(label)
-		self.table.attach(align, 0, 1, 3, 4, gtk.FILL, gtk.FILL)
-		label.show()
-		align.show()
-		self.parents_widgets = []
-
-		align = gtk.Alignment(0.0, 0.5)
-		label = gtk.Label()
-		label.set_markup("<b>Children:</b>")
-		align.add(label)
-		self.table.attach(align, 2, 3, 3, 4, gtk.FILL, gtk.FILL)
-		label.show()
-		align.show()
-		self.children_widgets = []
-
-		scrollwin = gtk.ScrolledWindow()
-		scrollwin.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
-		scrollwin.set_shadow_type(gtk.SHADOW_IN)
-		vbox.pack_start(scrollwin, expand=True, fill=True)
-		scrollwin.show()
-
-		(self.message_buffer, sourceview) = get_source_buffer_and_view()
-
-		sourceview.set_editable(False)
-		sourceview.modify_font(pango.FontDescription("Monospace"))
-		scrollwin.add(sourceview)
-		sourceview.show()
-
-		return vbox
-
-	def _treeview_cursor_cb(self, *args):
-		"""Callback for when the treeview cursor changes."""
-		(path, col) = self.treeview.get_cursor()
-		commit = self.model[path][0]
-
-		if commit.committer is not None:
-			committer = commit.committer
-			timestamp = commit.commit_date
-			message   =  commit.get_message(self.with_diff)
-			revid_label = commit.commit_sha1
-		else:
-			committer = ""
-			timestamp = ""
-			message = ""
-			revid_label = ""
-
-		self.revid_label.set_text(revid_label)
-		self.committer_label.set_text(committer)
-		self.timestamp_label.set_text(timestamp)
-		self.message_buffer.set_text(unicode(message, self.encoding).encode('utf-8'))
-
-		for widget in self.parents_widgets:
-			self.table.remove(widget)
-
-		self.parents_widgets = []
-		self.table.resize(4 + len(commit.parent_sha1) - 1, 4)
-		for idx, parent_id in enumerate(commit.parent_sha1):
-			self.table.set_row_spacing(idx + 3, 0)
-
-			align = gtk.Alignment(0.0, 0.0)
-			self.parents_widgets.append(align)
-			self.table.attach(align, 1, 2, idx + 3, idx + 4,
-					gtk.EXPAND | gtk.FILL, gtk.FILL)
-			align.show()
-
-			hbox = gtk.HBox(False, 0)
-			align.add(hbox)
-			hbox.show()
-
-			label = gtk.Label(parent_id)
-			label.set_selectable(True)
-			hbox.pack_start(label, expand=False, fill=True)
-			label.show()
-
-			image = gtk.Image()
-			image.set_from_stock(gtk.STOCK_JUMP_TO, gtk.ICON_SIZE_MENU)
-			image.show()
-
-			button = gtk.Button()
-			button.add(image)
-			button.set_relief(gtk.RELIEF_NONE)
-			button.connect("clicked", self._go_clicked_cb, parent_id)
-			hbox.pack_start(button, expand=False, fill=True)
-			button.show()
-
-			image = gtk.Image()
-			image.set_from_stock(gtk.STOCK_FIND, gtk.ICON_SIZE_MENU)
-			image.show()
-
-			button = gtk.Button()
-			button.add(image)
-			button.set_relief(gtk.RELIEF_NONE)
-			button.set_sensitive(True)
-			button.connect("clicked", self._show_clicked_cb,
-					commit.commit_sha1, parent_id, self.encoding)
-			hbox.pack_start(button, expand=False, fill=True)
-			button.show()
-
-		# Populate with child details
-		for widget in self.children_widgets:
-			self.table.remove(widget)
-
-		self.children_widgets = []
-		try:
-			child_sha1 = Commit.children_sha1[commit.commit_sha1]
-		except KeyError:
-			# We don't have child
-			child_sha1 = [ 0 ]
-
-		if ( len(child_sha1) > len(commit.parent_sha1)):
-			self.table.resize(4 + len(child_sha1) - 1, 4)
-
-		for idx, child_id in enumerate(child_sha1):
-			self.table.set_row_spacing(idx + 3, 0)
-
-			align = gtk.Alignment(0.0, 0.0)
-			self.children_widgets.append(align)
-			self.table.attach(align, 3, 4, idx + 3, idx + 4,
-					gtk.EXPAND | gtk.FILL, gtk.FILL)
-			align.show()
-
-			hbox = gtk.HBox(False, 0)
-			align.add(hbox)
-			hbox.show()
-
-			label = gtk.Label(child_id)
-			label.set_selectable(True)
-			hbox.pack_start(label, expand=False, fill=True)
-			label.show()
-
-			image = gtk.Image()
-			image.set_from_stock(gtk.STOCK_JUMP_TO, gtk.ICON_SIZE_MENU)
-			image.show()
-
-			button = gtk.Button()
-			button.add(image)
-			button.set_relief(gtk.RELIEF_NONE)
-			button.connect("clicked", self._go_clicked_cb, child_id)
-			hbox.pack_start(button, expand=False, fill=True)
-			button.show()
-
-			image = gtk.Image()
-			image.set_from_stock(gtk.STOCK_FIND, gtk.ICON_SIZE_MENU)
-			image.show()
-
-			button = gtk.Button()
-			button.add(image)
-			button.set_relief(gtk.RELIEF_NONE)
-			button.set_sensitive(True)
-			button.connect("clicked", self._show_clicked_cb,
-					child_id, commit.commit_sha1, self.encoding)
-			hbox.pack_start(button, expand=False, fill=True)
-			button.show()
-
-	def _destroy_cb(self, widget):
-		"""Callback for when a window we manage is destroyed."""
-		self.quit()
-
-
-	def quit(self):
-		"""Stop the GTK+ main loop."""
-		gtk.main_quit()
-
-	def run(self, args):
-		self.set_branch(args)
-		self.window.connect("destroy", self._destroy_cb)
-		self.window.show()
-		gtk.main()
-
-	def set_branch(self, args):
-		"""Fill in different windows with info from the reposiroty"""
-		fp = os.popen("git rev-parse --sq --default HEAD " + list_to_string(args, 1))
-		git_rev_list_cmd = fp.read()
-		fp.close()
-		fp = os.popen("git rev-list  --header --topo-order --parents " + git_rev_list_cmd)
-		self.update_window(fp)
-
-	def update_window(self, fp):
-		commit_lines = []
-
-		self.model = gtk.ListStore(gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
-				gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT, str, str, str)
-
-		# used for cursor positioning
-		self.index = {}
-
-		self.colours = {}
-		self.nodepos = {}
-		self.incomplete_line = {}
-		self.commits = []
-
-		index = 0
-		last_colour = 0
-		last_nodepos = -1
-		out_line = []
-		input_line = fp.readline()
-		while (input_line != ""):
-			# The commit header ends with '\0'
-			# This NULL is immediately followed by the sha1 of the
-			# next commit
-			if (input_line[0] != '\0'):
-				commit_lines.append(input_line)
-				input_line = fp.readline()
-				continue;
-
-			commit = Commit(commit_lines)
-			if (commit != None ):
-				self.commits.append(commit)
-
-			# Skip the '\0
-			commit_lines = []
-			commit_lines.append(input_line[1:])
-			input_line = fp.readline()
-
-		fp.close()
-
-		for commit in self.commits:
-			(out_line, last_colour, last_nodepos) = self.draw_graph(commit,
-										index, out_line,
-										last_colour,
-										last_nodepos)
-			self.index[commit.commit_sha1] = index
-			index += 1
-
-		self.treeview.set_model(self.model)
-		self.treeview.show()
-
-	def draw_graph(self, commit, index, out_line, last_colour, last_nodepos):
-		in_line=[]
-
-		#   |   -> outline
-		#   X
-		#   |\  <- inline
-
-		# Reset nodepostion
-		if (last_nodepos > 5):
-			last_nodepos = -1
-
-		# Add the incomplete lines of the last cell in this
-		try:
-			colour = self.colours[commit.commit_sha1]
-		except KeyError:
-			self.colours[commit.commit_sha1] = last_colour+1
-			last_colour = self.colours[commit.commit_sha1]
-			colour =   self.colours[commit.commit_sha1]
-
-		try:
-			node_pos = self.nodepos[commit.commit_sha1]
-		except KeyError:
-			self.nodepos[commit.commit_sha1] = last_nodepos+1
-			last_nodepos = self.nodepos[commit.commit_sha1]
-			node_pos =  self.nodepos[commit.commit_sha1]
-
-		#The first parent always continue on the same line
-		try:
-			# check we already have the value
-			tmp_node_pos = self.nodepos[commit.parent_sha1[0]]
-		except KeyError:
-			self.colours[commit.parent_sha1[0]] = colour
-			self.nodepos[commit.parent_sha1[0]] = node_pos
-
-		for sha1 in self.incomplete_line.keys():
-			if (sha1 != commit.commit_sha1):
-				self.draw_incomplete_line(sha1, node_pos,
-						out_line, in_line, index)
-			else:
-				del self.incomplete_line[sha1]
-
-
-		for parent_id in commit.parent_sha1:
-			try:
-				tmp_node_pos = self.nodepos[parent_id]
-			except KeyError:
-				self.colours[parent_id] = last_colour+1
-				last_colour = self.colours[parent_id]
-				self.nodepos[parent_id] = last_nodepos+1
-				last_nodepos = self.nodepos[parent_id]
-
-			in_line.append((node_pos, self.nodepos[parent_id],
-						self.colours[parent_id]))
-			self.add_incomplete_line(parent_id)
-
-		try:
-			branch_tag = self.bt_sha1[commit.commit_sha1]
-		except KeyError:
-			branch_tag = [ ]
-
-
-		node = (node_pos, colour, branch_tag)
-
-		self.model.append([commit, node, out_line, in_line,
-				commit.message, commit.author, commit.date])
-
-		return (in_line, last_colour, last_nodepos)
-
-	def add_incomplete_line(self, sha1):
-		try:
-			self.incomplete_line[sha1].append(self.nodepos[sha1])
-		except KeyError:
-			self.incomplete_line[sha1] = [self.nodepos[sha1]]
-
-	def draw_incomplete_line(self, sha1, node_pos, out_line, in_line, index):
-		for idx, pos in enumerate(self.incomplete_line[sha1]):
-			if(pos == node_pos):
-				#remove the straight line and add a slash
-				if ((pos, pos, self.colours[sha1]) in out_line):
-					out_line.remove((pos, pos, self.colours[sha1]))
-				out_line.append((pos, pos+0.5, self.colours[sha1]))
-				self.incomplete_line[sha1][idx] = pos = pos+0.5
-			try:
-				next_commit = self.commits[index+1]
-				if (next_commit.commit_sha1 == sha1 and pos != int(pos)):
-				# join the line back to the node point
-				# This need to be done only if we modified it
-					in_line.append((pos, pos-0.5, self.colours[sha1]))
-					continue;
-			except IndexError:
-				pass
-			in_line.append((pos, pos, self.colours[sha1]))
-
-
-	def _go_clicked_cb(self, widget, revid):
-		"""Callback for when the go button for a parent is clicked."""
-		try:
-			self.treeview.set_cursor(self.index[revid])
-		except KeyError:
-			dialog = gtk.MessageDialog(parent=None, flags=0,
-					type=gtk.MESSAGE_WARNING, buttons=gtk.BUTTONS_CLOSE,
-					message_format=None)
-			dialog.set_markup("Revision <b>%s</b> not present in the list" % revid)
-			# revid == 0 is the parent of the first commit
-			if (revid != 0 ):
-				dialog.format_secondary_text("Try running gitview without any options")
-			dialog.run()
-			dialog.destroy()
-
-		self.treeview.grab_focus()
-
-	def _show_clicked_cb(self, widget,  commit_sha1, parent_sha1, encoding):
-		"""Callback for when the show button for a parent is clicked."""
-		window = DiffWindow()
-		window.set_diff(commit_sha1, parent_sha1, encoding)
-		self.treeview.grab_focus()
-
-without_diff = 0
-if __name__ == "__main__":
-
-	if (len(sys.argv) > 1 ):
-		if (sys.argv[1] == "--without-diff"):
-			without_diff = 1
-
-	view = GitView( without_diff != 1)
-	view.run(sys.argv[without_diff:])
diff --git a/contrib/gitview/gitview.txt b/contrib/gitview/gitview.txt
deleted file mode 100644
index 7b5f9002b9..0000000000
--- a/contrib/gitview/gitview.txt
+++ /dev/null
@@ -1,57 +0,0 @@
-gitview(1)
-==========
-
-NAME
-----
-gitview - A GTK based repository browser for git
-
-SYNOPSIS
---------
-[verse]
-'gitview' [options] [args]
-
-DESCRIPTION
----------
-
-Dependencies:
-
-* Python 2.4
-* PyGTK 2.8 or later
-* PyCairo 1.0 or later
-
-OPTIONS
--------
---without-diff::
-
-	If the user doesn't want to list the commit diffs in the main window.
-	This may speed up the repository browsing.
-
-<args>::
-
-	All the valid option for linkgit:git-rev-list[1].
-
-Key Bindings
-------------
-F4::
-	To maximize the window
-
-F5::
-	To reread references.
-
-F11::
-	Full screen
-
-F12::
-	Leave full screen
-
-EXAMPLES
---------
-
-gitview v2.6.12.. include/scsi drivers/scsi::
-
-	Show as the changes since version v2.6.12 that changed any file in the
-	include/scsi or drivers/scsi subdirectories
-
-gitview --since=2.weeks.ago::
-
-	Show the changes during the last two weeks
diff --git a/contrib/long-running-filter/example.pl b/contrib/long-running-filter/example.pl
new file mode 100755
index 0000000000..a677569ddd
--- /dev/null
+++ b/contrib/long-running-filter/example.pl
@@ -0,0 +1,132 @@
+#!/usr/bin/perl
+#
+# Example implementation for the Git filter protocol version 2
+# See Documentation/gitattributes.txt, section "Filter Protocol"
+#
+# Please note, this pass-thru filter is a minimal skeleton. No proper
+# error handling was implemented.
+#
+
+use strict;
+use warnings;
+
+my $MAX_PACKET_CONTENT_SIZE = 65516;
+
+sub packet_bin_read {
+	my $buffer;
+	my $bytes_read = read STDIN, $buffer, 4;
+	if ( $bytes_read == 0 ) {
+
+		# EOF - Git stopped talking to us!
+		exit();
+	}
+	elsif ( $bytes_read != 4 ) {
+		die "invalid packet: '$buffer'";
+	}
+	my $pkt_size = hex($buffer);
+	if ( $pkt_size == 0 ) {
+		return ( 1, "" );
+	}
+	elsif ( $pkt_size > 4 ) {
+		my $content_size = $pkt_size - 4;
+		$bytes_read = read STDIN, $buffer, $content_size;
+		if ( $bytes_read != $content_size ) {
+			die "invalid packet ($content_size bytes expected; $bytes_read bytes read)";
+		}
+		return ( 0, $buffer );
+	}
+	else {
+		die "invalid packet size: $pkt_size";
+	}
+}
+
+sub packet_txt_read {
+	my ( $res, $buf ) = packet_bin_read();
+	unless ( $buf =~ s/\n$// ) {
+		die "A non-binary line MUST be terminated by an LF.";
+	}
+	return ( $res, $buf );
+}
+
+sub packet_bin_write {
+	my $buf = shift;
+	print STDOUT sprintf( "%04x", length($buf) + 4 );
+	print STDOUT $buf;
+	STDOUT->flush();
+}
+
+sub packet_txt_write {
+	packet_bin_write( $_[0] . "\n" );
+}
+
+sub packet_flush {
+	print STDOUT sprintf( "%04x", 0 );
+	STDOUT->flush();
+}
+
+( packet_txt_read() eq ( 0, "git-filter-client" ) ) || die "bad initialize";
+( packet_txt_read() eq ( 0, "version=2" ) )         || die "bad version";
+( packet_bin_read() eq ( 1, "" ) )                  || die "bad version end";
+
+packet_txt_write("git-filter-server");
+packet_txt_write("version=2");
+packet_flush();
+
+( packet_txt_read() eq ( 0, "capability=clean" ) )  || die "bad capability";
+( packet_txt_read() eq ( 0, "capability=smudge" ) ) || die "bad capability";
+( packet_bin_read() eq ( 1, "" ) )                  || die "bad capability end";
+
+packet_txt_write("capability=clean");
+packet_txt_write("capability=smudge");
+packet_flush();
+
+while (1) {
+	my ($command)  = packet_txt_read() =~ /^command=(.+)$/;
+	my ($pathname) = packet_txt_read() =~ /^pathname=(.+)$/;
+
+	if ( $pathname eq "" ) {
+		die "bad pathname '$pathname'";
+	}
+
+	packet_bin_read();
+
+	my $input = "";
+	{
+		binmode(STDIN);
+		my $buffer;
+		my $done = 0;
+		while ( !$done ) {
+			( $done, $buffer ) = packet_bin_read();
+			$input .= $buffer;
+		}
+	}
+
+	my $output;
+	if ( $command eq "clean" ) {
+		### Perform clean here ###
+		$output = $input;
+	}
+	elsif ( $command eq "smudge" ) {
+		### Perform smudge here ###
+		$output = $input;
+	}
+	else {
+		die "bad command '$command'";
+	}
+
+	packet_txt_write("status=success");
+	packet_flush();
+	while ( length($output) > 0 ) {
+		my $packet = substr( $output, 0, $MAX_PACKET_CONTENT_SIZE );
+		packet_bin_write($packet);
+		if ( length($output) > $MAX_PACKET_CONTENT_SIZE ) {
+			$output = substr( $output, $MAX_PACKET_CONTENT_SIZE );
+		}
+		else {
+			$output = "";
+		}
+	}
+	packet_flush();    # flush content!
+	packet_flush();    # empty list, keep "status=success" unchanged!
+
+}
diff --git a/contrib/remote-helpers/git-remote-bzr b/contrib/remote-helpers/git-remote-bzr
index 712a1377e2..1c3d87f861 100755
--- a/contrib/remote-helpers/git-remote-bzr
+++ b/contrib/remote-helpers/git-remote-bzr
@@ -1,13 +1,11 @@
-#!/usr/bin/env python
+#!/bin/sh
 
-import sys
-
-sys.stderr.write('WARNING: git-remote-bzr is now maintained independently.\n')
-sys.stderr.write('WARNING: For more information visit https://github.com/felipec/git-remote-bzr\n')
-
-sys.stderr.write('''WARNING:
+cat >&2 <<'EOT'
+WARNING: git-remote-bzr is now maintained independently.
+WARNING: For more information visit https://github.com/felipec/git-remote-bzr
+WARNING:
 WARNING: You can pick a directory on your $PATH and download it, e.g.:
-WARNING:   $ wget -O $HOME/bin/git-remote-bzr \\
+WARNING:   $ wget -O $HOME/bin/git-remote-bzr \
 WARNING:     https://raw.github.com/felipec/git-remote-bzr/master/git-remote-bzr
 WARNING:   $ chmod +x $HOME/bin/git-remote-bzr
-''')
+EOT
diff --git a/contrib/remote-helpers/git-remote-hg b/contrib/remote-helpers/git-remote-hg
index 4255ad6312..8e9188364c 100755
--- a/contrib/remote-helpers/git-remote-hg
+++ b/contrib/remote-helpers/git-remote-hg
@@ -1,13 +1,11 @@
-#!/usr/bin/env python
+#!/bin/sh
 
-import sys
-
-sys.stderr.write('WARNING: git-remote-hg is now maintained independently.\n')
-sys.stderr.write('WARNING: For more information visit https://github.com/felipec/git-remote-hg\n')
-
-sys.stderr.write('''WARNING:
+cat >&2 <<'EOT'
+WARNING: git-remote-hg is now maintained independently.
+WARNING: For more information visit https://github.com/felipec/git-remote-hg
+WARNING:
 WARNING: You can pick a directory on your $PATH and download it, e.g.:
-WARNING:   $ wget -O $HOME/bin/git-remote-hg \\
+WARNING:   $ wget -O $HOME/bin/git-remote-hg \
 WARNING:     https://raw.github.com/felipec/git-remote-hg/master/git-remote-hg
 WARNING:   $ chmod +x $HOME/bin/git-remote-hg
-''')
+EOT
diff --git a/contrib/update-unicode/.gitignore b/contrib/update-unicode/.gitignore
new file mode 100644
index 0000000000..b0ebc6aad2
--- /dev/null
+++ b/contrib/update-unicode/.gitignore
@@ -0,0 +1,3 @@
+uniset/
+UnicodeData.txt
+EastAsianWidth.txt
diff --git a/contrib/update-unicode/README b/contrib/update-unicode/README
new file mode 100644
index 0000000000..b9e2fc8540
--- /dev/null
+++ b/contrib/update-unicode/README
@@ -0,0 +1,20 @@
+TL;DR: Run update_unicode.sh after the publication of a new Unicode
+standard and commit the resulting unicode_widths.h file.
+
+The long version
+================
+
+The Git source code ships the file unicode_widths.h which contains
+tables of zero and double width Unicode code points, respectively.
+These tables are generated using update_unicode.sh in this directory.
+update_unicode.sh itself uses a third-party tool, uniset, to query two
+Unicode data files for the interesting code points.
+
+On first run, update_unicode.sh clones uniset from Github and builds it.
+This requires a current-ish version of autoconf (2.69 works per December
+2016).
+
+On each run, update_unicode.sh checks whether more recent Unicode data
+files are available from the Unicode consortium, and rebuilds the header
+unicode_widths.h with the new data. The new header can then be
+committed.
diff --git a/contrib/update-unicode/update_unicode.sh b/contrib/update-unicode/update_unicode.sh
new file mode 100755
index 0000000000..e05db92d3f
--- /dev/null
+++ b/contrib/update-unicode/update_unicode.sh
@@ -0,0 +1,33 @@
+#!/bin/sh
+#See http://www.unicode.org/reports/tr44/
+#
+#Me Enclosing_Mark  an enclosing combining mark
+#Mn Nonspacing_Mark a nonspacing combining mark (zero advance width)
+#Cf Format          a format control character
+#
+cd "$(dirname "$0")"
+UNICODEWIDTH_H=$(git rev-parse --show-toplevel)/unicode_width.h
+
+wget -N http://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt \
+	http://www.unicode.org/Public/UCD/latest/ucd/EastAsianWidth.txt &&
+if ! test -d uniset; then
+	git clone https://github.com/depp/uniset.git &&
+	( cd uniset && git checkout 4b186196dd )
+fi &&
+(
+	cd uniset &&
+	if ! test -x uniset; then
+		autoreconf -i &&
+		./configure --enable-warnings=-Werror CFLAGS='-O0 -ggdb'
+	fi &&
+	make
+) &&
+UNICODE_DIR=. && export UNICODE_DIR &&
+cat >$UNICODEWIDTH_H <<-EOF
+static const struct interval zero_width[] = {
+	$(uniset/uniset --32 cat:Me,Mn,Cf + U+1160..U+11FF - U+00AD)
+};
+static const struct interval double_width[] = {
+	$(uniset/uniset --32 eaw:F,W)
+};
+EOF