[PATCH] git-describe: allow reflogs as reference points
Signed-off-by: Jeff King <peff@peff.net>
---
It's basically impossible to use this in the git repository, since we
prefer tags to reflogs. Should --reflog turn off tag matching? Should
there be a command line option to turn off tags?
Documentation/git-describe.txt | 9 ++++++-
describe.c | 51 +++++++++++++++++++++++++++++++++++++++-
2 files changed, 58 insertions(+), 2 deletions(-)
diff --git a/Documentation/git-describe.txt b/Documentation/git-describe.txt
index 2700f35..975da0f 100644
--- a/Documentation/git-describe.txt
+++ b/Documentation/git-describe.txt
@@ -8,7 +8,7 @@ git-describe - Show the most recent tag
SYNOPSIS
--------
-'git-describe' [--all] [--tags] [--abbrev=<n>] <committish>...
+'git-describe' [--all] [--tags] [--reflog] [--abbrev=<n>] <committish>...
DESCRIPTION
-----------
@@ -31,6 +31,13 @@ OPTIONS
Instead of using only the annotated tags, use any tag
found in `.git/refs/tags`.
+--reflog=<fmt>::
+ Instead of using only the annotated tags, use reference dates
+ marked in branch reflogs. The output will be of the form
+ 'branch@{date}' where the format of date is specified by <fmt>, which
+ must be one of 'relative', '822', 'git'. If no format is specified,
+ the default is 'relative'.
+
--abbrev=<n>::
Instead of using the default 8 hexadecimal digits as the
abbreviated object name, use <n> digits.
diff --git a/describe.c b/describe.c
index f4029ee..1dc5209 100644
--- a/describe.c
+++ b/describe.c
@@ -6,11 +6,16 @@ #include "refs.h"
#define SEEN (1u << 0)
static const char describe_usage[] =
-"git-describe [--all] [--tags] [--abbrev=<n>] <committish>*";
+"git-describe [--all] [--tags] [--reflog] [--abbrev=<n>] <committish>*";
static int all; /* Default to annotated tags only */
static int tags; /* But allow any tags if --tags is specified */
+#define FMT_DATE_822 1
+#define FMT_DATE_GIT 2
+#define FMT_DATE_REL 3
+static int reflog;
+
static int abbrev = DEFAULT_ABBREV;
static int names, allocs;
@@ -85,6 +90,35 @@ static int get_name(const char *path, co
return 0;
}
+static int get_reflog_name(const char *ref, const unsigned char *head_sha1,
+ int flag, void *cb_data)
+{
+ unsigned char sha1[20];
+ char buf[1024];
+ struct reflog log;
+ struct reflog_entry c;
+
+ snprintf(buf, sizeof(buf), "refs/heads/%s", ref);
+ if (reflog_open(&log, buf) < 0) {
+ if (errno == ENOENT)
+ return 0;
+ die("unable to read log %s: %s\n", log.file, strerror(errno));
+ }
+ reflog_start(&log);
+ while (reflog_next(&log, &c)) {
+ snprintf(buf, sizeof(buf), "%s@{%s}",
+ ref,
+ reflog == FMT_DATE_REL ? show_date(c.date, 0, 1) :
+ reflog == FMT_DATE_GIT ? show_date(c.date, c.tz, 0) :
+ show_rfc2822_date(c.date, c.tz));
+ reflog_entry_to(&c, sha1);
+ add_to_known_names(buf, lookup_commit_reference(sha1), 0);
+ }
+ reflog_close(&log);
+ return 0;
+}
+
+
static int compare_names(const void *_a, const void *_b)
{
struct commit_name *a = *(struct commit_name **)_a;
@@ -114,6 +148,8 @@ static void describe(const char *arg, in
if (!initialized) {
initialized = 1;
for_each_ref(get_name, NULL);
+ if (reflog)
+ for_each_branch_ref(get_reflog_name, NULL);
qsort(name_array, names, sizeof(*name_array), compare_names);
}
@@ -152,6 +188,19 @@ int main(int argc, char **argv)
all = 1;
else if (!strcmp(arg, "--tags"))
tags = 1;
+ else if (!strncmp(arg, "--reflog=", 9)) {
+ if (!strcmp(arg+9, "2822") || !strcmp(arg+9, "822"))
+ reflog = FMT_DATE_822;
+ else if (!strcmp(arg+9, "git"))
+ reflog = FMT_DATE_GIT;
+ else if (!strcmp(arg+9, "relative"))
+ reflog = FMT_DATE_REL;
+ else
+ usage(describe_usage);
+ }
+ else if (!strcmp(arg, "--reflog")) {
+ reflog = FMT_DATE_REL;
+ }
else if (!strncmp(arg, "--abbrev=", 9)) {
abbrev = strtoul(arg + 9, NULL, 10);
if (abbrev < MINIMUM_ABBREV || 40 < abbrev)
--
1.4.2.1.gd4f1-dirty
Jeff King <peff@peff.net>