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#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 read_stdin = 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 void call_diff_setup_done(void)
{
diff_setup_done(&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;
call_diff_setup_done();
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;
call_diff_setup_done();
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 char *commit, const char *parent, const char *msg, unsigned long len)
{
static char this_header[16384];
int offset;
if (!verbose_header)
return commit;
offset = sprintf(this_header, "%s%s (from %s)\n", header_prefix, commit, parent);
offset += pretty_print_commit(commit_format, msg, len, this_header + offset, sizeof(this_header) - offset);
return this_header;
}
static int diff_tree_commit(const unsigned char *commit, const char *name)
{
unsigned long size, offset;
char *buf = read_object_with_reference(commit, "commit", &size, NULL);
if (!buf)
return -1;
if (!name) {
static char commit_name[60];
strcpy(commit_name, sha1_to_hex(commit));
name = commit_name;
}
/* Root commit? */
if (show_root_diff && memcmp(buf + 46, "parent ", 7)) {
header = generate_header(name, "root", buf, size);
diff_root_tree(commit, "");
}
/* More than one parent? */
if (ignore_merges) {
if (!memcmp(buf + 46 + 48, "parent ", 7))
return 0;
}
offset = 46;
while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
unsigned char parent[20];
if (get_sha1_hex(buf + offset + 7, parent))
return -1;
header = generate_header(name, sha1_to_hex(parent), buf, size);
diff_tree_sha1_top(parent, commit, "");
if (!header && verbose_header) {
header_prefix = "\ndiff-tree ";
/*
* Don't print multiple merge entries if we
* don't print the diffs.
*/
}
offset += 48;
}
free(buf);
return 0;
}
static int diff_tree_stdin(char *line)
{
int len = strlen(line);
unsigned char commit[20], parent[20];
static char this_header[1000];
if (!len || line[len-1] != '\n')
return -1;
line[len-1] = 0;
if (get_sha1_hex(line, commit))
return -1;
if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
line[40] = 0;
line[81] = 0;
sprintf(this_header, "%s (from %s)\n", line, line+41);
header = this_header;
return diff_tree_sha1_top(parent, commit, "");
}
line[40] = 0;
return diff_tree_commit(commit, line);
}
static const char diff_tree_usage[] =
"git-diff-tree [--stdin] [-m] [-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_default_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, "-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;
}
usage(diff_tree_usage);
}
if (diff_options.output_format == DIFF_FORMAT_PATCH)
diff_options.recursive = 1;
diff_tree_setup_paths(get_pathspec(prefix, argv));
switch (nr_sha1) {
case 0:
if (!read_stdin)
usage(diff_tree_usage);
break;
case 1:
diff_tree_commit(sha1[0], NULL);
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;
}