log-tree: separate major part of diff-tree.
This separates out the part that deals with one-commit diff-tree (and --stdin form) into a separate log-tree module. There are two goals with this. The more important one is to be able to make this part available to "git log --diff", so that we can have a native "git whatchanged" command. Another is to simplify the commit log generation part simpler. Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano
226
diff-tree.c
226
diff-tree.c
@ -1,152 +1,16 @@
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#include "cache.h"
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#include "diff.h"
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#include "commit.h"
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#include "log-tree.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_type, &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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header = diff_tree_combined_merge(sha1, header,
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dense_combined_merges,
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&diff_options);
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if (!header && verbose_header)
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header_prefix = "\ndiff-tree ";
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return 0;
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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 struct log_tree_opt log_tree_opt;
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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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return log_tree_commit(&log_tree_opt, commit);
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}
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static int diff_tree_stdin(char *line)
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@ -184,7 +48,7 @@ static int diff_tree_stdin(char *line)
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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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return log_tree_commit(&log_tree_opt, commit);
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}
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static const char diff_tree_usage[] =
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@ -200,13 +64,15 @@ int main(int argc, const char **argv)
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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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static struct log_tree_opt *opt = &log_tree_opt;
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int read_stdin = 0;
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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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init_log_tree_opt(opt);
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for (;;) {
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int diff_opt_cnt;
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int opt_cnt;
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const char *arg;
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argv++;
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@ -223,84 +89,39 @@ int main(int argc, const char **argv)
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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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opt_cnt = log_tree_opt_parse(opt, argv, argc);
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if (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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else if (opt_cnt) {
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argv += opt_cnt - 1;
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argc -= 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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ignore_merges = 0;
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if (opt->combine_merges)
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opt->ignore_merges = 0;
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/* We can only do dense combined merges with diff output */
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if (dense_combined_merges)
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diff_options.output_format = DIFF_FORMAT_PATCH;
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if (opt->dense_combined_merges)
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opt->diffopt.output_format = DIFF_FORMAT_PATCH;
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if (diff_options.output_format == DIFF_FORMAT_PATCH)
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diff_options.recursive = 1;
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if (opt->diffopt.output_format == DIFF_FORMAT_PATCH)
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opt->diffopt.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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diff_setup_done(&opt->diffopt);
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switch (nr_sha1) {
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case 0:
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@ -311,15 +132,16 @@ int main(int argc, const char **argv)
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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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diff_tree_sha1(sha1[0], sha1[1], "", &opt->diffopt);
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log_tree_diff_flush(opt);
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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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if (opt->diffopt.detect_rename)
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opt->diffopt.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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