зеркало из https://github.com/microsoft/git.git
323 строки
7.2 KiB
C
323 строки
7.2 KiB
C
#include "cache.h"
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#include "diff.h"
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#include "commit.h"
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static int show_root_diff = 0;
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static int no_commit_id = 0;
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static int verbose_header = 0;
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static int ignore_merges = 1;
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static int combine_merges = 0;
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static int dense_combined_merges = 0;
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static int read_stdin = 0;
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static int always_show_header = 0;
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static const char *header = NULL;
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static const char *header_prefix = "";
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static enum cmit_fmt commit_format = CMIT_FMT_RAW;
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static struct diff_options diff_options;
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static int call_diff_flush(void)
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{
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diffcore_std(&diff_options);
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if (diff_queue_is_empty()) {
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int saved_fmt = diff_options.output_format;
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diff_options.output_format = DIFF_FORMAT_NO_OUTPUT;
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diff_flush(&diff_options);
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diff_options.output_format = saved_fmt;
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return 0;
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}
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if (header) {
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if (!no_commit_id)
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printf("%s%c", header, diff_options.line_termination);
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header = NULL;
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}
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diff_flush(&diff_options);
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return 1;
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}
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static int diff_tree_sha1_top(const unsigned char *old,
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const unsigned char *new, const char *base)
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{
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int ret;
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ret = diff_tree_sha1(old, new, base, &diff_options);
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call_diff_flush();
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return ret;
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}
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static int diff_root_tree(const unsigned char *new, const char *base)
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{
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int retval;
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void *tree;
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struct tree_desc empty, real;
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tree = read_object_with_reference(new, "tree", &real.size, NULL);
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if (!tree)
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die("unable to read root tree (%s)", sha1_to_hex(new));
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real.buf = tree;
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empty.buf = "";
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empty.size = 0;
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retval = diff_tree(&empty, &real, base, &diff_options);
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free(tree);
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call_diff_flush();
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return retval;
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}
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static const char *generate_header(const unsigned char *commit_sha1,
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const unsigned char *parent_sha1,
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const struct commit *commit)
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{
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static char this_header[16384];
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int offset;
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unsigned long len;
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int abbrev = diff_options.abbrev;
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const char *msg = commit->buffer;
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if (!verbose_header)
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return sha1_to_hex(commit_sha1);
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len = strlen(msg);
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offset = sprintf(this_header, "%s%s ",
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header_prefix,
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diff_unique_abbrev(commit_sha1, abbrev));
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if (commit_sha1 != parent_sha1)
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offset += sprintf(this_header + offset, "(from %s)\n",
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parent_sha1
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? diff_unique_abbrev(parent_sha1, abbrev)
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: "root");
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else
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offset += sprintf(this_header + offset, "(from parents)\n");
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offset += pretty_print_commit(commit_format, commit, len,
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this_header + offset,
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sizeof(this_header) - offset, abbrev);
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if (always_show_header) {
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puts(this_header);
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return NULL;
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}
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return this_header;
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}
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static int diff_tree_commit(struct commit *commit)
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{
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struct commit_list *parents;
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unsigned const char *sha1 = commit->object.sha1;
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/* Root commit? */
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if (show_root_diff && !commit->parents) {
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header = generate_header(sha1, NULL, commit);
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diff_root_tree(sha1, "");
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}
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/* More than one parent? */
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if (commit->parents && commit->parents->next) {
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if (ignore_merges)
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return 0;
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else if (combine_merges) {
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header = generate_header(sha1, sha1, commit);
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return diff_tree_combined_merge(sha1, header,
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dense_combined_merges);
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}
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}
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for (parents = commit->parents; parents; parents = parents->next) {
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struct commit *parent = parents->item;
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header = generate_header(sha1, parent->object.sha1, commit);
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diff_tree_sha1_top(parent->object.sha1, sha1, "");
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if (!header && verbose_header) {
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header_prefix = "\ndiff-tree ";
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/*
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* Don't print multiple merge entries if we
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* don't print the diffs.
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*/
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}
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}
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return 0;
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}
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static int diff_tree_commit_sha1(const unsigned char *sha1)
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{
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struct commit *commit = lookup_commit_reference(sha1);
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if (!commit)
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return -1;
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return diff_tree_commit(commit);
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}
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static int diff_tree_stdin(char *line)
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{
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int len = strlen(line);
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unsigned char sha1[20];
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struct commit *commit;
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if (!len || line[len-1] != '\n')
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return -1;
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line[len-1] = 0;
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if (get_sha1_hex(line, sha1))
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return -1;
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commit = lookup_commit(sha1);
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if (!commit || parse_commit(commit))
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return -1;
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if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
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/* Graft the fake parents locally to the commit */
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int pos = 41;
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struct commit_list **pptr, *parents;
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/* Free the real parent list */
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for (parents = commit->parents; parents; ) {
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struct commit_list *tmp = parents->next;
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free(parents);
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parents = tmp;
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}
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commit->parents = NULL;
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pptr = &(commit->parents);
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while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
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struct commit *parent = lookup_commit(sha1);
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if (parent) {
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pptr = &commit_list_insert(parent, pptr)->next;
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}
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pos += 41;
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}
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}
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return diff_tree_commit(commit);
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}
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static const char diff_tree_usage[] =
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"git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
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"[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
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" -r diff recursively\n"
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" --root include the initial commit as diff against /dev/null\n"
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COMMON_DIFF_OPTIONS_HELP;
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int main(int argc, const char **argv)
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{
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int nr_sha1;
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char line[1000];
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unsigned char sha1[2][20];
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const char *prefix = setup_git_directory();
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git_config(git_diff_config);
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nr_sha1 = 0;
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diff_setup(&diff_options);
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for (;;) {
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int diff_opt_cnt;
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const char *arg;
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argv++;
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argc--;
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arg = *argv;
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if (!arg)
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break;
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if (*arg != '-') {
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if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
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nr_sha1++;
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continue;
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}
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break;
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}
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diff_opt_cnt = diff_opt_parse(&diff_options, argv, argc);
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if (diff_opt_cnt < 0)
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usage(diff_tree_usage);
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else if (diff_opt_cnt) {
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argv += diff_opt_cnt - 1;
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argc -= diff_opt_cnt - 1;
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continue;
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}
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if (!strcmp(arg, "--")) {
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argv++;
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argc--;
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break;
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}
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if (!strcmp(arg, "-r")) {
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diff_options.recursive = 1;
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continue;
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}
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if (!strcmp(arg, "-t")) {
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diff_options.recursive = 1;
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diff_options.tree_in_recursive = 1;
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continue;
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}
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if (!strcmp(arg, "-m")) {
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ignore_merges = 0;
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continue;
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}
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if (!strcmp(arg, "-c")) {
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combine_merges = 1;
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continue;
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}
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if (!strcmp(arg, "--cc")) {
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dense_combined_merges = combine_merges = 1;
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continue;
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}
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if (!strcmp(arg, "-v")) {
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verbose_header = 1;
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header_prefix = "diff-tree ";
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continue;
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}
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if (!strncmp(arg, "--pretty", 8)) {
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verbose_header = 1;
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header_prefix = "diff-tree ";
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commit_format = get_commit_format(arg+8);
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continue;
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}
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if (!strcmp(arg, "--stdin")) {
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read_stdin = 1;
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continue;
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}
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if (!strcmp(arg, "--root")) {
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show_root_diff = 1;
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continue;
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}
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if (!strcmp(arg, "--no-commit-id")) {
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no_commit_id = 1;
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continue;
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}
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if (!strcmp(arg, "--always")) {
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always_show_header = 1;
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continue;
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}
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usage(diff_tree_usage);
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}
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if (combine_merges) {
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diff_options.output_format = DIFF_FORMAT_PATCH;
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ignore_merges = 0;
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}
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if (diff_options.output_format == DIFF_FORMAT_PATCH)
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diff_options.recursive = 1;
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diff_tree_setup_paths(get_pathspec(prefix, argv));
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diff_setup_done(&diff_options);
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switch (nr_sha1) {
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case 0:
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if (!read_stdin)
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usage(diff_tree_usage);
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break;
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case 1:
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diff_tree_commit_sha1(sha1[0]);
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break;
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case 2:
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diff_tree_sha1_top(sha1[0], sha1[1], "");
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break;
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}
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if (!read_stdin)
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return 0;
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if (diff_options.detect_rename)
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diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
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DIFF_SETUP_USE_CACHE);
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while (fgets(line, sizeof(line), stdin))
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diff_tree_stdin(line);
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return 0;
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}
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