Merge branch 'master' into ph/strbuf

* master: (94 commits)
  Fixed update-hook example allow-users format.
  Documentation/git-svn: updated design philosophy notes
  t/t4014: test "am -3" with mode-only change.
  git-commit.sh: Shell script cleanup
  preserve executable bits in zip archives
  Fix lapsus in builtin-apply.c
  git-push: documentation and tests for pushing only branches
  git-svnimport: Use separate arguments in the pipe for git-rev-parse
  contrib/fast-import: add perl version of simple example
  contrib/fast-import: add simple shell example
  rev-list --bisect: Bisection "distance" clean up.
  rev-list --bisect: Move some bisection code into best_bisection.
  rev-list --bisect: Move finding bisection into do_find_bisection.
  Document ls-files --with-tree=<tree-ish>
  git-commit: partial commit of paths only removed from the index
  git-commit: Allow partial commit of file removal.
  send-email: make message-id generation a bit more robust
  git-apply: fix whitespace stripping
  git-gui: Disable native platform text selection in "lists"
  apply --index-info: fall back to current index for mode changes
  ...

1 files changed, 78 insertions, 0 deletions

diff --git a/builtin-ls-files.c b/builtin-ls-files.c
index cce17b5ced..6c1db86e80 100644
--- a/builtin-ls-files.c
+++ b/builtin-ls-files.c
@@ -9,6 +9,7 @@
 #include "quote.h"
 #include "dir.h"
 #include "builtin.h"
+#include "tree.h"
 
 static int abbrev;
 static int show_deleted;
@@ -26,6 +27,7 @@ static int prefix_offset;
 static const char **pathspec;
 static int error_unmatch;
 static char *ps_matched;
+static const char *with_tree;
 
 static const char *tag_cached = "";
 static const char *tag_unmerged = "";
@@ -247,6 +249,8 @@ static void show_files(struct dir_struct *dir, const char *prefix)
 				continue;
 			if (show_unmerged && !ce_stage(ce))
 				continue;
+			if (ce->ce_flags & htons(CE_UPDATE))
+				continue;
 			show_ce_entry(ce_stage(ce) ? tag_unmerged : tag_cached, ce);
 		}
 	}
@@ -332,6 +336,67 @@ static const char *verify_pathspec(const char *prefix)
 	return real_prefix;
 }
 
+/*
+ * Read the tree specified with --with-tree option
+ * (typically, HEAD) into stage #1 and then
+ * squash them down to stage #0.  This is used for
+ * --error-unmatch to list and check the path patterns
+ * that were given from the command line.  We are not
+ * going to write this index out.
+ */
+static void overlay_tree(const char *tree_name, const char *prefix)
+{
+	struct tree *tree;
+	unsigned char sha1[20];
+	const char **match;
+	struct cache_entry *last_stage0 = NULL;
+	int i;
+
+	if (get_sha1(tree_name, sha1))
+		die("tree-ish %s not found.", tree_name);
+	tree = parse_tree_indirect(sha1);
+	if (!tree)
+		die("bad tree-ish %s", tree_name);
+
+	/* Hoist the unmerged entries up to stage #3 to make room */
+	for (i = 0; i < active_nr; i++) {
+		struct cache_entry *ce = active_cache[i];
+		if (!ce_stage(ce))
+			continue;
+		ce->ce_flags |= htons(CE_STAGEMASK);
+	}
+
+	if (prefix) {
+		static const char *(matchbuf[2]);
+		matchbuf[0] = prefix;
+		matchbuf [1] = NULL;
+		match = matchbuf;
+	} else
+		match = NULL;
+	if (read_tree(tree, 1, match))
+		die("unable to read tree entries %s", tree_name);
+
+	for (i = 0; i < active_nr; i++) {
+		struct cache_entry *ce = active_cache[i];
+		switch (ce_stage(ce)) {
+		case 0:
+			last_stage0 = ce;
+			/* fallthru */
+		default:
+			continue;
+		case 1:
+			/*
+			 * If there is stage #0 entry for this, we do not
+			 * need to show it.  We use CE_UPDATE bit to mark
+			 * such an entry.
+			 */
+			if (last_stage0 &&
+			    !strcmp(last_stage0->name, ce->name))
+				ce->ce_flags |= htons(CE_UPDATE);
+		}
+	}
+}
+
 static const char ls_files_usage[] =
 	"git-ls-files [-z] [-t] [-v] (--[cached|deleted|others|stage|unmerged|killed|modified])* "
 	"[ --ignored ] [--exclude=<pattern>] [--exclude-from=<file>] "
@@ -452,6 +517,10 @@ int cmd_ls_files(int argc, const char **argv, const char *prefix)
 			error_unmatch = 1;
 			continue;
 		}
+		if (!prefixcmp(arg, "--with-tree=")) {
+			with_tree = arg + 12;
+			continue;
+		}
 		if (!prefixcmp(arg, "--abbrev=")) {
 			abbrev = strtoul(arg+9, NULL, 10);
 			if (abbrev && abbrev < MINIMUM_ABBREV)
@@ -503,6 +572,15 @@ int cmd_ls_files(int argc, const char **argv, const char *prefix)
 	read_cache();
 	if (prefix)
 		prune_cache(prefix);
+	if (with_tree) {
+		/*
+		 * Basic sanity check; show-stages and show-unmerged
+		 * would not make any sense with this option.
+		 */
+		if (show_stage || show_unmerged)
+			die("ls-files --with-tree is incompatible with -s or -u");
+		overlay_tree(with_tree, prefix);
+	}
 	show_files(&dir, prefix);
 
 	if (ps_matched) {