This lets you do things like
git show-ref | grep /v1 | git name-rev --refs-from=- $commit
or even
git show-ref | ./some_complex_ref_filter >refs
git name-rev --refs-from=refs --stdin <list_of_commits
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
On Sat, Feb 17, 2007 at 10:25:00AM -0800, Junio C Hamano wrote:
>> git show-ref | grep tags/v1.4 | git name-rev --stdin-refs 33db5f4d
> FWIW, I like that.
Here it is (I chose --refs-from= so you could use it with the existing
--stdin flag). We might want to do the same for git-describe, I would
think (they can probably share the for_each_ref_from_file code).
The input format is "sha1 ref"; clearly it could also accept just "ref",
and look up the sha1, but I expect most people will just be piping from
git-show-ref anyway.
Documentation/git-name-rev.txt | 16 +++++++++++-
builtin-name-rev.c | 54 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 67 insertions(+), 3 deletions(-)
diff --git a/Documentation/git-name-rev.txt b/Documentation/git-name-rev.txt
index 37fbf66..d2fb3bb 100644
--- a/Documentation/git-name-rev.txt
+++ b/Documentation/git-name-rev.txt
@@ -8,7 +8,7 @@ git-name-rev - Find symbolic names for given revs
SYNOPSIS
--------
-'git-name-rev' [--tags] ( --all | --stdin | <committish>... )
+'git-name-rev' [--tags] [--refs-from=<file>] ( --all | --stdin | <committish>... )
DESCRIPTION
-----------
@@ -22,6 +22,13 @@ OPTIONS
--tags::
Do not use branch names, but only tags to name the commits
+--refs-from=<file>::
+ Instead of choosing a name based on all refs, read refs from <file>,
+ one per line, in the form "sha1 ref". This is the same as the
+ default output generated by "git show-ref". If <file> is "-",
+ read from stdin. The --tags option is still respected when using
+ --refs-from.
+
--all::
List all commits reachable from all refs
@@ -52,6 +59,13 @@ Another nice thing you can do is:
% git log | git name-rev --stdin
------------
+You can filter the commits used to describe a commit using the --refs-from
+option:
+
+------------
+% git show-ref | grep tags/v1 | git name-rev --refs-from=- 26cfcfbf
+------------
+
Author
------
diff --git a/builtin-name-rev.c b/builtin-name-rev.c
index b4f15cc..c8480d2 100644
--- a/builtin-name-rev.c
+++ b/builtin-name-rev.c
@@ -5,7 +5,7 @@
#include "refs.h"
static const char name_rev_usage[] =
- "git-name-rev [--tags] ( --all | --stdin | committish [committish...] )\n";
+"git-name-rev [--tags] [--refs-from=<file>] ( --all | --stdin | committish ... )";
typedef struct rev_name {
const char *tip_name;
@@ -14,6 +14,7 @@ typedef struct rev_name {
} rev_name;
static long cutoff = LONG_MAX;
+static const char *refs_from = NULL;
static void name_rev(struct commit *commit,
const char *tip_name, int merge_traversals, int generation,
@@ -103,6 +104,46 @@ static int name_ref(const char *path, const unsigned char *sha1, int flags, void
return 0;
}
+static void trim_trailing_whitespace(char *buf)
+{
+ int i = strlen(buf) - 1;
+ while(i >= 0 && isspace(buf[i]))
+ buf[i--] = '\0';
+}
+
+static void for_each_ref_from_file(const char *filename, each_ref_fn fn, void *data)
+{
+ FILE *fh;
+ char buf[PATH_MAX + 40 + 3]; /* "PATH SHA1\n\0" */
+ unsigned char sha1[20];
+
+ if (!strcmp(filename, "-"))
+ fh = stdin;
+ else {
+ fh = fopen(filename, "r");
+ if (!fh)
+ die("unable to open %s: %s", filename, strerror(errno));
+ }
+
+ while (fgets(buf, sizeof buf, fh)) {
+ char *name;
+
+ trim_trailing_whitespace(buf);
+
+ name = strchr(buf, ' ');
+ if (!name)
+ die("invalid input ref format: %s\n", buf);
+ *name++ = '\0';
+
+ if (get_sha1_hex(buf, sha1) < 0)
+ die("invalid sha1: %s\n", buf);
+
+ name_ref(name, sha1, 0, data);
+ }
+
+ fclose(fh);
+}
+
/* returns a static buffer */
static const char* get_rev_name(struct object *o)
{
@@ -160,6 +201,9 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
transform_stdin = 1;
cutoff = 0;
continue;
+ } else if (!strncmp(*argv, "--refs-from=", 12)) {
+ refs_from = (*argv)+12;
+ continue;
}
usage(name_rev_usage);
}
@@ -185,7 +229,13 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
add_object_array((struct object *)commit, *argv, &revs);
}
- for_each_ref(name_ref, &tags_only);
+ if (refs_from && !strcmp(refs_from, "-") && transform_stdin)
+ die("--refs-from=- and --stdin are incompatible!");
+
+ if (refs_from)
+ for_each_ref_from_file(refs_from, name_ref, &tags_only);
+ else
+ for_each_ref(name_ref, &tags_only);
if (transform_stdin) {
char buffer[2048];
--
1.5.0.552.ge1b1c-dirty
-
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