git/builtin-diff-tree.c
Paul Mackerras e0c97ca63d Make git-diff-tree indicate when it flushes
There are times when gitk needs to know that the commits it has sent
to git-diff-tree --stdin did not match, and it needs to know in a
timely fashion even if none of them match.  At the moment,
git-diff-tree outputs nothing for non-matching commits, so it is
impossible for gitk to distinguish between git-diff-tree being slow
and git-diff-tree saying no.

This makes git-diff-tree flush its output and echo back the
input line when it is not a valid-looking object name.  Gitk, or
other users of git-diff-tree --stdin, can use a blank line or
any other "marker line" to indicate that git-diff-tree has
processed all the commits on its input up to the echoed back
marker line, and any commits that have not been output do not
match.

[jc: re-done after a couple of back-and-forth discussion on the list.]

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-29 19:04:19 -07:00

153 lines
3.4 KiB
C

#include "cache.h"
#include "diff.h"
#include "commit.h"
#include "log-tree.h"
#include "builtin.h"
static struct rev_info log_tree_opt;
static int diff_tree_commit_sha1(const unsigned char *sha1)
{
struct commit *commit = lookup_commit_reference(sha1);
if (!commit)
return -1;
return log_tree_commit(&log_tree_opt, commit);
}
static int diff_tree_stdin(char *line)
{
int len = strlen(line);
unsigned char sha1[20];
struct commit *commit;
if (!len || line[len-1] != '\n')
return -1;
line[len-1] = 0;
if (get_sha1_hex(line, sha1))
return -1;
commit = lookup_commit(sha1);
if (!commit || parse_commit(commit))
return -1;
if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
/* Graft the fake parents locally to the commit */
int pos = 41;
struct commit_list **pptr, *parents;
/* Free the real parent list */
for (parents = commit->parents; parents; ) {
struct commit_list *tmp = parents->next;
free(parents);
parents = tmp;
}
commit->parents = NULL;
pptr = &(commit->parents);
while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
struct commit *parent = lookup_commit(sha1);
if (parent) {
pptr = &commit_list_insert(parent, pptr)->next;
}
pos += 41;
}
}
return log_tree_commit(&log_tree_opt, commit);
}
static const char diff_tree_usage[] =
"git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
"[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
" -r diff recursively\n"
" --root include the initial commit as diff against /dev/null\n"
COMMON_DIFF_OPTIONS_HELP;
int cmd_diff_tree(int argc, const char **argv, char **envp)
{
int nr_sha1;
char line[1000];
struct object *tree1, *tree2;
static struct rev_info *opt = &log_tree_opt;
struct object_list *list;
int read_stdin = 0;
git_config(git_diff_config);
nr_sha1 = 0;
init_revisions(opt);
opt->abbrev = 0;
opt->diff = 1;
argc = setup_revisions(argc, argv, opt, NULL);
while (--argc > 0) {
const char *arg = *++argv;
if (!strcmp(arg, "--stdin")) {
read_stdin = 1;
continue;
}
usage(diff_tree_usage);
}
/*
* NOTE! "setup_revisions()" will have inserted the revisions
* it parsed in reverse order. So if you do
*
* git-diff-tree a b
*
* the commit list will be "b" -> "a" -> NULL, so we reverse
* the order of the objects if the first one is not marked
* UNINTERESTING.
*/
nr_sha1 = 0;
list = opt->pending_objects;
if (list) {
nr_sha1++;
tree1 = list->item;
list = list->next;
if (list) {
nr_sha1++;
tree2 = tree1;
tree1 = list->item;
if (list->next)
usage(diff_tree_usage);
/* Switch them around if the second one was uninteresting.. */
if (tree2->flags & UNINTERESTING) {
struct object *tmp = tree2;
tree2 = tree1;
tree1 = tmp;
}
}
}
switch (nr_sha1) {
case 0:
if (!read_stdin)
usage(diff_tree_usage);
break;
case 1:
diff_tree_commit_sha1(tree1->sha1);
break;
case 2:
diff_tree_sha1(tree1->sha1,
tree2->sha1,
"", &opt->diffopt);
log_tree_diff_flush(opt);
break;
}
if (!read_stdin)
return 0;
if (opt->diffopt.detect_rename)
opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
DIFF_SETUP_USE_CACHE);
while (fgets(line, sizeof(line), stdin)) {
unsigned char sha1[20];
if (get_sha1_hex(line, sha1)) {
fputs(line, stdout);
fflush(stdout);
}
else
diff_tree_stdin(line);
}
return 0;
}