Files
git/builtin/diff-tree.c
Junio C Hamano f66d1423f5 builtin: send usage() help text to standard output
Using the show_usage_and_exit_if_asked() helper we introduced
earlier, fix callers of usage() that want to show the help text when
explicitly asked by the end-user.  The help text now goes to the
standard output stream for them.

These are the bog standard "if we got only '-h', then that is a
request for help" callers.  Their

	if (argc == 2 && !strcmp(argv[1], "-h"))
		usage(message);

are simply replaced with

	show_usage_and_exit_if_asked(argc, argv, message);

With this, the built-ins tested by t0012 all send their help text to
their standard output stream, so the check in t0012 that was half
tightened earlier is now fully tightened to insist on standard error
stream being empty.

Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2025-01-17 13:30:03 -08:00

239 lines
6.3 KiB
C

#define USE_THE_REPOSITORY_VARIABLE
#include "builtin.h"
#include "config.h"
#include "diff.h"
#include "commit.h"
#include "gettext.h"
#include "hex.h"
#include "log-tree.h"
#include "read-cache-ll.h"
#include "revision.h"
#include "tmp-objdir.h"
#include "tree.h"
static struct rev_info log_tree_opt;
static int diff_tree_commit_oid(const struct object_id *oid)
{
struct commit *commit = lookup_commit_reference(the_repository, oid);
if (!commit)
return -1;
return log_tree_commit(&log_tree_opt, commit);
}
/* Diff one or more commits. */
static int stdin_diff_commit(struct commit *commit, const char *p)
{
struct object_id oid;
struct commit_list **pptr = NULL;
/* Graft the fake parents locally to the commit */
while (isspace(*p++) && !parse_oid_hex(p, &oid, &p)) {
struct commit *parent = lookup_commit(the_repository, &oid);
if (!pptr) {
/* Free the real parent list */
free_commit_list(commit->parents);
commit->parents = NULL;
pptr = &(commit->parents);
}
if (parent) {
pptr = &commit_list_insert(parent, pptr)->next;
}
}
return log_tree_commit(&log_tree_opt, commit);
}
/* Diff two trees. */
static int stdin_diff_trees(struct tree *tree1, const char *p)
{
struct object_id oid;
struct tree *tree2;
if (!isspace(*p++) || parse_oid_hex(p, &oid, &p) || *p)
return error("Need exactly two trees, separated by a space");
tree2 = lookup_tree(the_repository, &oid);
if (!tree2 || parse_tree(tree2))
return -1;
printf("%s %s\n", oid_to_hex(&tree1->object.oid),
oid_to_hex(&tree2->object.oid));
diff_tree_oid(&tree1->object.oid, &tree2->object.oid,
"", &log_tree_opt.diffopt);
log_tree_diff_flush(&log_tree_opt);
return 0;
}
static int diff_tree_stdin(char *line)
{
int len = strlen(line);
struct object_id oid;
struct object *obj;
const char *p;
if (!len || line[len-1] != '\n')
return -1;
line[len-1] = 0;
if (parse_oid_hex(line, &oid, &p))
return -1;
obj = parse_object(the_repository, &oid);
if (!obj)
return -1;
if (obj->type == OBJ_COMMIT)
return stdin_diff_commit((struct commit *)obj, p);
if (obj->type == OBJ_TREE)
return stdin_diff_trees((struct tree *)obj, p);
error("Object %s is a %s, not a commit or tree",
oid_to_hex(&oid), type_name(obj->type));
return -1;
}
static const char diff_tree_usage[] =
"git diff-tree [--stdin] [-m] [-s] [-v] [--no-commit-id] [--pretty]\n"
" [-t] [-r] [-c | --cc] [--combined-all-paths] [--root] [--merge-base]\n"
" [<common-diff-options>] <tree-ish> [<tree-ish>] [<path>...]\n"
"\n"
" -r diff recursively\n"
" -c show combined diff for merge commits\n"
" --cc show combined diff for merge commits removing uninteresting hunks\n"
" --combined-all-paths\n"
" show name of file in all parents for combined diffs\n"
" --root include the initial commit as diff against /dev/null\n"
COMMON_DIFF_OPTIONS_HELP;
static void diff_tree_tweak_rev(struct rev_info *rev)
{
if (!rev->diffopt.output_format) {
if (rev->dense_combined_merges)
rev->diffopt.output_format = DIFF_FORMAT_PATCH;
else
rev->diffopt.output_format = DIFF_FORMAT_RAW;
}
}
int cmd_diff_tree(int argc,
const char **argv,
const char *prefix,
struct repository *repo UNUSED)
{
char line[1000];
struct object *tree1, *tree2;
static struct rev_info *opt = &log_tree_opt;
struct setup_revision_opt s_r_opt;
struct userformat_want w;
int read_stdin = 0;
int merge_base = 0;
show_usage_if_asked(argc, argv, diff_tree_usage);
git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
prepare_repo_settings(the_repository);
the_repository->settings.command_requires_full_index = 0;
repo_init_revisions(the_repository, opt, prefix);
if (repo_read_index(the_repository) < 0)
die(_("index file corrupt"));
opt->abbrev = 0;
opt->diff = 1;
opt->disable_stdin = 1;
memset(&s_r_opt, 0, sizeof(s_r_opt));
s_r_opt.tweak = diff_tree_tweak_rev;
prefix = precompose_argv_prefix(argc, argv, prefix);
argc = setup_revisions(argc, argv, opt, &s_r_opt);
memset(&w, 0, sizeof(w));
userformat_find_requirements(NULL, &w);
if (!opt->show_notes_given && w.notes)
opt->show_notes = 1;
if (opt->show_notes)
load_display_notes(&opt->notes_opt);
while (--argc > 0) {
const char *arg = *++argv;
if (!strcmp(arg, "--stdin")) {
read_stdin = 1;
continue;
}
if (!strcmp(arg, "--merge-base")) {
merge_base = 1;
continue;
}
usage(diff_tree_usage);
}
if (read_stdin && merge_base)
die(_("options '%s' and '%s' cannot be used together"), "--stdin", "--merge-base");
if (merge_base && opt->pending.nr != 2)
die(_("--merge-base only works with two commits"));
opt->diffopt.rotate_to_strict = 1;
/*
* NOTE! We expect "a..b" to expand to "^a b" but it is
* perfectly valid for revision range parser to yield "b ^a",
* which means the same thing. If we get the latter, i.e. the
* second one is marked UNINTERESTING, we recover the original
* order the user gave, i.e. "a..b", by swapping the trees.
*/
switch (opt->pending.nr) {
case 0:
if (!read_stdin)
usage(diff_tree_usage);
break;
case 1:
tree1 = opt->pending.objects[0].item;
diff_tree_commit_oid(&tree1->oid);
break;
case 2:
tree1 = opt->pending.objects[0].item;
tree2 = opt->pending.objects[1].item;
if (merge_base) {
struct object_id oid;
diff_get_merge_base(opt, &oid);
tree1 = lookup_object(the_repository, &oid);
} else if (tree2->flags & UNINTERESTING) {
SWAP(tree2, tree1);
}
diff_tree_oid(&tree1->oid, &tree2->oid, "", &opt->diffopt);
log_tree_diff_flush(opt);
break;
}
if (read_stdin) {
int saved_nrl = 0;
int saved_dcctc = 0;
opt->diffopt.rotate_to_strict = 0;
opt->diffopt.no_free = 1;
if (opt->diffopt.detect_rename) {
if (the_repository->index->cache)
repo_read_index(the_repository);
opt->diffopt.setup |= DIFF_SETUP_USE_SIZE_CACHE;
}
while (fgets(line, sizeof(line), stdin)) {
struct object_id oid;
if (get_oid_hex(line, &oid)) {
fputs(line, stdout);
fflush(stdout);
}
else {
diff_tree_stdin(line);
if (saved_nrl < opt->diffopt.needed_rename_limit)
saved_nrl = opt->diffopt.needed_rename_limit;
if (opt->diffopt.degraded_cc_to_c)
saved_dcctc = 1;
}
}
opt->diffopt.degraded_cc_to_c = saved_dcctc;
opt->diffopt.needed_rename_limit = saved_nrl;
opt->diffopt.no_free = 0;
diff_free(&opt->diffopt);
}
return diff_result_code(opt);
}