1 files changed, 315 insertions, 0 deletions
diff --git a/reflog-walk.c b/reflog-walk.c
new file mode 100644
index 0000000000..caba4f743f
--- /dev/null
+++ b/reflog-walk.c
@@ -0,0 +1,315 @@
+#include "cache.h"
+#include "commit.h"
+#include "refs.h"
+#include "diff.h"
+#include "revision.h"
+#include "string-list.h"
+#include "reflog-walk.h"
+
+struct complete_reflogs {
+	char *ref;
+	const char *short_ref;
+	struct reflog_info {
+		unsigned char osha1[20], nsha1[20];
+		char *email;
+		unsigned long timestamp;
+		int tz;
+		char *message;
+	} *items;
+	int nr, alloc;
+};
+
+static int read_one_reflog(unsigned char *osha1, unsigned char *nsha1,
+		const char *email, unsigned long timestamp, int tz,
+		const char *message, void *cb_data)
+{
+	struct complete_reflogs *array = cb_data;
+	struct reflog_info *item;
+
+	if (array->nr >= array->alloc) {
+		array->alloc = alloc_nr(array->nr + 1);
+		array->items = xrealloc(array->items, array->alloc *
+			sizeof(struct reflog_info));
+	}
+	item = array->items + array->nr;
+	memcpy(item->osha1, osha1, 20);
+	memcpy(item->nsha1, nsha1, 20);
+	item->email = xstrdup(email);
+	item->timestamp = timestamp;
+	item->tz = tz;
+	item->message = xstrdup(message);
+	array->nr++;
+	return 0;
+}
+
+static struct complete_reflogs *read_complete_reflog(const char *ref)
+{
+	struct complete_reflogs *reflogs =
+		xcalloc(sizeof(struct complete_reflogs), 1);
+	reflogs->ref = xstrdup(ref);
+	for_each_reflog_ent(ref, read_one_reflog, reflogs);
+	if (reflogs->nr == 0) {
+		unsigned char sha1[20];
+		const char *name = resolve_ref(ref, sha1, 1, NULL);
+		if (name)
+			for_each_reflog_ent(name, read_one_reflog, reflogs);
+	}
+	if (reflogs->nr == 0) {
+		int len = strlen(ref);
+		char *refname = xmalloc(len + 12);
+		sprintf(refname, "refs/%s", ref);
+		for_each_reflog_ent(refname, read_one_reflog, reflogs);
+		if (reflogs->nr == 0) {
+			sprintf(refname, "refs/heads/%s", ref);
+			for_each_reflog_ent(refname, read_one_reflog, reflogs);
+		}
+		free(refname);
+	}
+	return reflogs;
+}
+
+static int get_reflog_recno_by_time(struct complete_reflogs *array,
+	unsigned long timestamp)
+{
+	int i;
+	for (i = array->nr - 1; i >= 0; i--)
+		if (timestamp >= array->items[i].timestamp)
+			return i;
+	return -1;
+}
+
+struct commit_info_lifo {
+	struct commit_info {
+		struct commit *commit;
+		void *util;
+	} *items;
+	int nr, alloc;
+};
+
+static struct commit_info *get_commit_info(struct commit *commit,
+		struct commit_info_lifo *lifo, int pop)
+{
+	int i;
+	for (i = 0; i < lifo->nr; i++)
+		if (lifo->items[i].commit == commit) {
+			struct commit_info *result = &lifo->items[i];
+			if (pop) {
+				if (i + 1 < lifo->nr)
+					memmove(lifo->items + i,
+						lifo->items + i + 1,
+						(lifo->nr - i) *
+						sizeof(struct commit_info));
+				lifo->nr--;
+			}
+			return result;
+		}
+	return NULL;
+}
+
+static void add_commit_info(struct commit *commit, void *util,
+		struct commit_info_lifo *lifo)
+{
+	struct commit_info *info;
+	if (lifo->nr >= lifo->alloc) {
+		lifo->alloc = alloc_nr(lifo->nr + 1);
+		lifo->items = xrealloc(lifo->items,
+			lifo->alloc * sizeof(struct commit_info));
+	}
+	info = lifo->items + lifo->nr;
+	info->commit = commit;
+	info->util = util;
+	lifo->nr++;
+}
+
+struct commit_reflog {
+	int flag, recno;
+	struct complete_reflogs *reflogs;
+};
+
+struct reflog_walk_info {
+	struct commit_info_lifo reflogs;
+	struct string_list complete_reflogs;
+	struct commit_reflog *last_commit_reflog;
+};
+
+void init_reflog_walk(struct reflog_walk_info** info)
+{
+	*info = xcalloc(sizeof(struct reflog_walk_info), 1);
+}
+
+int add_reflog_for_walk(struct reflog_walk_info *info,
+		struct commit *commit, const char *name)
+{
+	unsigned long timestamp = 0;
+	int recno = -1;
+	struct string_list_item *item;
+	struct complete_reflogs *reflogs;
+	char *branch, *at = strchr(name, '@');
+	struct commit_reflog *commit_reflog;
+
+	if (commit->object.flags & UNINTERESTING)
+		die ("Cannot walk reflogs for %s", name);
+
+	branch = xstrdup(name);
+	if (at && at[1] == '{') {
+		char *ep;
+		branch[at - name] = '\0';
+		recno = strtoul(at + 2, &ep, 10);
+		if (*ep != '}') {
+			recno = -1;
+			timestamp = approxidate(at + 2);
+		}
+	} else
+		recno = 0;
+
+	item = string_list_lookup(branch, &info->complete_reflogs);
+	if (item)
+		reflogs = item->util;
+	else {
+		if (*branch == '\0') {
+			unsigned char sha1[20];
+			const char *head = resolve_ref("HEAD", sha1, 0, NULL);
+			if (!head)
+				die ("No current branch");
+			free(branch);
+			branch = xstrdup(head);
+		}
+		reflogs = read_complete_reflog(branch);
+		if (!reflogs || reflogs->nr == 0) {
+			unsigned char sha1[20];
+			char *b;
+			if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
+				if (reflogs) {
+					free(reflogs->ref);
+					free(reflogs);
+				}
+				free(branch);
+				branch = b;
+				reflogs = read_complete_reflog(branch);
+			}
+		}
+		if (!reflogs || reflogs->nr == 0)
+			return -1;
+		string_list_insert(branch, &info->complete_reflogs)->util
+			= reflogs;
+	}
+
+	commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
+	if (recno < 0) {
+		commit_reflog->flag = 1;
+		commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
+		if (commit_reflog->recno < 0) {
+			free(branch);
+			free(commit_reflog);
+			return -1;
+		}
+	} else
+		commit_reflog->recno = reflogs->nr - recno - 1;
+	commit_reflog->reflogs = reflogs;
+
+	add_commit_info(commit, commit_reflog, &info->reflogs);
+	return 0;
+}
+
+void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
+{
+	struct commit_info *commit_info =
+		get_commit_info(commit, &info->reflogs, 0);
+	struct commit_reflog *commit_reflog;
+	struct reflog_info *reflog;
+
+	info->last_commit_reflog = NULL;
+	if (!commit_info)
+		return;
+
+	commit_reflog = commit_info->util;
+	if (commit_reflog->recno < 0) {
+		commit->parents = NULL;
+		return;
+	}
+
+	reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
+	info->last_commit_reflog = commit_reflog;
+	commit_reflog->recno--;
+	commit_info->commit = (struct commit *)parse_object(reflog->osha1);
+	if (!commit_info->commit) {
+		commit->parents = NULL;
+		return;
+	}
+
+	commit->parents = xcalloc(sizeof(struct commit_list), 1);
+	commit->parents->item = commit_info->commit;
+	commit->object.flags &= ~(ADDED | SEEN | SHOWN);
+}
+
+void get_reflog_selector(struct strbuf *sb,
+			 struct reflog_walk_info *reflog_info,
+			 enum date_mode dmode,
+			 int shorten)
+{
+	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
+	struct reflog_info *info;
+	const char *printed_ref;
+
+	if (!commit_reflog)
+		return;
+
+	if (shorten) {
+		if (!commit_reflog->reflogs->short_ref)
+			commit_reflog->reflogs->short_ref
+				= shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
+		printed_ref = commit_reflog->reflogs->short_ref;
+	} else {
+		printed_ref = commit_reflog->reflogs->ref;
+	}
+
+	strbuf_addf(sb, "%s@{", printed_ref);
+	if (commit_reflog->flag || dmode) {
+		info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
+		strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
+	} else {
+		strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
+			    - 2 - commit_reflog->recno);
+	}
+
+	strbuf_addch(sb, '}');
+}
+
+void get_reflog_message(struct strbuf *sb,
+			struct reflog_walk_info *reflog_info)
+{
+	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
+	struct reflog_info *info;
+	size_t len;
+
+	if (!commit_reflog)
+		return;
+
+	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
+	len = strlen(info->message);
+	if (len > 0)
+		len--; /* strip away trailing newline */
+	strbuf_add(sb, info->message, len);
+}
+
+void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
+	enum date_mode dmode)
+{
+	if (reflog_info && reflog_info->last_commit_reflog) {
+		struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
+		struct reflog_info *info;
+		struct strbuf selector = STRBUF_INIT;
+
+		info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
+		get_reflog_selector(&selector, reflog_info, dmode, 0);
+		if (oneline) {
+			printf("%s: %s", selector.buf, info->message);
+		}
+		else {
+			printf("Reflog: %s (%s)\nReflog message: %s",
+			       selector.buf, info->email, info->message);
+		}
+
+		strbuf_release(&selector);
+	}
+}