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rev-list: Introduce --quiet to avoid /dev/null redirects 

Some uses of git-rev-list are to run it with --objects to see if
a range of objects between two or more commits is fully connected
or not.  In such a case the caller doesn't care about the actual
object names or hash hints so formatting this data only for it to
be dumped to /dev/null by a redirect is a waste of CPU time.  If
all the caller needs is the exit status then --quiet can be used
to bypass the commit and object formatting.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce 2007-11-11 02:29:41 -05:00 committed by Junio C Hamano
parent b73a439759
commit 27350891de
2 changed files with 31 additions and 4 deletions
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9
Documentation/git-rev-list.txt
View File

@ -20,6 +20,7 @@ SYNOPSIS
[ \--not ]
[ \--all ]
[ \--stdin ]
[ \--quiet ]
[ \--topo-order ]
[ \--parents ]
[ \--timestamp ]
@ -270,6 +271,14 @@ limiting may be applied.
In addition to the '<commit>' listed on the command
line, read them from the standard input.
--quiet::
Don't print anything to standard output. This form of
git-rev-list is primarly meant to allow the caller to
test the exit status to see if a range of objects is fully
connected (or not). It is faster than redirecting stdout
to /dev/null as the output does not have to be formatted.
--cherry-pick::
Omit any commit that introduces the same change as

26
builtin-rev-list.c
View File

@ -26,6 +26,7 @@ static const char rev_list_usage[] =
" --remove-empty\n"
" --all\n"
" --stdin\n"
" --quiet\n"
" ordering output:\n"
" --topo-order\n"
" --date-order\n"
@ -50,6 +51,7 @@ static int show_timestamp;
static int hdr_termination;
static const char *header_prefix;
static void finish_commit(struct commit *commit);
static void show_commit(struct commit *commit)
{
if (show_timestamp)
@ -93,6 +95,11 @@ static void show_commit(struct commit *commit)
strbuf_release(&buf);
}
maybe_flush_or_die(stdout, "stdout");
finish_commit(commit);
}
static void finish_commit(struct commit *commit)
{
if (commit->parents) {
free_commit_list(commit->parents);
commit->parents = NULL;
@ -101,6 +108,12 @@ static void show_commit(struct commit *commit)
commit->buffer = NULL;
}
static void finish_object(struct object_array_entry *p)
{
if (p->item->type == OBJ_BLOB && !has_sha1_file(p->item->sha1))
die("missing blob object '%s'", sha1_to_hex(p->item->sha1));
}
static void show_object(struct object_array_entry *p)
{
/* An object with name "foo\n0000000..." can be used to
@ -108,9 +121,7 @@ static void show_object(struct object_array_entry *p)
*/
const char *ep = strchr(p->name, '\n');
if (p->item->type == OBJ_BLOB && !has_sha1_file(p->item->sha1))
die("missing blob object '%s'", sha1_to_hex(p->item->sha1));
finish_object(p);
if (ep) {
printf("%s %.*s\n", sha1_to_hex(p->item->sha1),
(int) (ep - p->name),
@ -527,6 +538,7 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
int read_from_stdin = 0;
int bisect_show_vars = 0;
int bisect_find_all = 0;
int quiet = 0;
git_config(git_default_config);
init_revisions(&revs, prefix);
@ -565,6 +577,10 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
read_revisions_from_stdin(&revs);
continue;
}
if (!strcmp(arg, "--quiet")) {
quiet = 1;
continue;
}
usage(rev_list_usage);
}
@ -640,7 +656,9 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
}
}
traverse_commit_list(&revs, show_commit, show_object);
traverse_commit_list(&revs,
quiet ? finish_commit : show_commit,
quiet ? finish_object : show_object);
return 0;
}