git/diff-tree.c

329 строки
7.3 KiB
C

#include "cache.h"
#include "diff.h"
#include "commit.h"
static int show_root_diff = 0;
static int no_commit_id = 0;
static int verbose_header = 0;
static int ignore_merges = 1;
static int combine_merges = 0;
static int dense_combined_merges = 0;
static int read_stdin = 0;
static int always_show_header = 0;
static const char *header = NULL;
static const char *header_prefix = "";
static enum cmit_fmt commit_format = CMIT_FMT_RAW;
static struct diff_options diff_options;
static int call_diff_flush(void)
{
diffcore_std(&diff_options);
if (diff_queue_is_empty()) {
int saved_fmt = diff_options.output_format;
diff_options.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_flush(&diff_options);
diff_options.output_format = saved_fmt;
return 0;
}
if (header) {
if (!no_commit_id)
printf("%s%c", header, diff_options.line_termination);
header = NULL;
}
diff_flush(&diff_options);
return 1;
}
static int diff_tree_sha1_top(const unsigned char *old,
const unsigned char *new, const char *base)
{
int ret;
ret = diff_tree_sha1(old, new, base, &diff_options);
call_diff_flush();
return ret;
}
static int diff_root_tree(const unsigned char *new, const char *base)
{
int retval;
void *tree;
struct tree_desc empty, real;
tree = read_object_with_reference(new, "tree", &real.size, NULL);
if (!tree)
die("unable to read root tree (%s)", sha1_to_hex(new));
real.buf = tree;
empty.buf = "";
empty.size = 0;
retval = diff_tree(&empty, &real, base, &diff_options);
free(tree);
call_diff_flush();
return retval;
}
static const char *generate_header(const unsigned char *commit_sha1,
const unsigned char *parent_sha1,
const struct commit *commit)
{
static char this_header[16384];
int offset;
unsigned long len;
int abbrev = diff_options.abbrev;
const char *msg = commit->buffer;
if (!verbose_header)
return sha1_to_hex(commit_sha1);
len = strlen(msg);
offset = sprintf(this_header, "%s%s ",
header_prefix,
diff_unique_abbrev(commit_sha1, abbrev));
if (commit_sha1 != parent_sha1)
offset += sprintf(this_header + offset, "(from %s)\n",
parent_sha1
? diff_unique_abbrev(parent_sha1, abbrev)
: "root");
else
offset += sprintf(this_header + offset, "(from parents)\n");
offset += pretty_print_commit(commit_format, commit, len,
this_header + offset,
sizeof(this_header) - offset, abbrev);
if (always_show_header) {
puts(this_header);
return NULL;
}
return this_header;
}
static int diff_tree_commit(struct commit *commit)
{
struct commit_list *parents;
unsigned const char *sha1 = commit->object.sha1;
/* Root commit? */
if (show_root_diff && !commit->parents) {
header = generate_header(sha1, NULL, commit);
diff_root_tree(sha1, "");
}
/* More than one parent? */
if (commit->parents && commit->parents->next) {
if (ignore_merges)
return 0;
else if (combine_merges) {
header = generate_header(sha1, sha1, commit);
header = diff_tree_combined_merge(sha1, header,
dense_combined_merges,
&diff_options);
if (!header && verbose_header)
header_prefix = "\ndiff-tree ";
return 0;
}
}
for (parents = commit->parents; parents; parents = parents->next) {
struct commit *parent = parents->item;
header = generate_header(sha1, parent->object.sha1, commit);
diff_tree_sha1_top(parent->object.sha1, sha1, "");
if (!header && verbose_header) {
header_prefix = "\ndiff-tree ";
/*
* Don't print multiple merge entries if we
* don't print the diffs.
*/
}
}
return 0;
}
static int diff_tree_commit_sha1(const unsigned char *sha1)
{
struct commit *commit = lookup_commit_reference(sha1);
if (!commit)
return -1;
return diff_tree_commit(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 diff_tree_commit(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 main(int argc, const char **argv)
{
int nr_sha1;
char line[1000];
unsigned char sha1[2][20];
const char *prefix = setup_git_directory();
git_config(git_diff_config);
nr_sha1 = 0;
diff_setup(&diff_options);
for (;;) {
int diff_opt_cnt;
const char *arg;
argv++;
argc--;
arg = *argv;
if (!arg)
break;
if (*arg != '-') {
if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
nr_sha1++;
continue;
}
break;
}
diff_opt_cnt = diff_opt_parse(&diff_options, argv, argc);
if (diff_opt_cnt < 0)
usage(diff_tree_usage);
else if (diff_opt_cnt) {
argv += diff_opt_cnt - 1;
argc -= diff_opt_cnt - 1;
continue;
}
if (!strcmp(arg, "--")) {
argv++;
argc--;
break;
}
if (!strcmp(arg, "-r")) {
diff_options.recursive = 1;
continue;
}
if (!strcmp(arg, "-t")) {
diff_options.recursive = 1;
diff_options.tree_in_recursive = 1;
continue;
}
if (!strcmp(arg, "-m")) {
ignore_merges = 0;
continue;
}
if (!strcmp(arg, "-c")) {
combine_merges = 1;
continue;
}
if (!strcmp(arg, "--cc")) {
dense_combined_merges = combine_merges = 1;
continue;
}
if (!strcmp(arg, "-v")) {
verbose_header = 1;
header_prefix = "diff-tree ";
continue;
}
if (!strncmp(arg, "--pretty", 8)) {
verbose_header = 1;
header_prefix = "diff-tree ";
commit_format = get_commit_format(arg+8);
continue;
}
if (!strcmp(arg, "--stdin")) {
read_stdin = 1;
continue;
}
if (!strcmp(arg, "--root")) {
show_root_diff = 1;
continue;
}
if (!strcmp(arg, "--no-commit-id")) {
no_commit_id = 1;
continue;
}
if (!strcmp(arg, "--always")) {
always_show_header = 1;
continue;
}
usage(diff_tree_usage);
}
if (combine_merges)
ignore_merges = 0;
/* We can only do dense combined merges with diff output */
if (dense_combined_merges)
diff_options.output_format = DIFF_FORMAT_PATCH;
if (diff_options.output_format == DIFF_FORMAT_PATCH)
diff_options.recursive = 1;
diff_tree_setup_paths(get_pathspec(prefix, argv));
diff_setup_done(&diff_options);
switch (nr_sha1) {
case 0:
if (!read_stdin)
usage(diff_tree_usage);
break;
case 1:
diff_tree_commit_sha1(sha1[0]);
break;
case 2:
diff_tree_sha1_top(sha1[0], sha1[1], "");
break;
}
if (!read_stdin)
return 0;
if (diff_options.detect_rename)
diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
DIFF_SETUP_USE_CACHE);
while (fgets(line, sizeof(line), stdin))
diff_tree_stdin(line);
return 0;
}