C++ run_diff_files函数代码示例

static int check_changes_tracked_files(struct pathspec ps)
{
	int result;
	struct rev_info rev;
	struct object_id dummy;

	/* No initial commit. */
	if (get_oid("HEAD", &dummy))
		return -1;

	if (read_cache() < 0)
		return -1;

	init_revisions(&rev, NULL);
	rev.prune_data = ps;

	rev.diffopt.flags.quick = 1;
	rev.diffopt.flags.ignore_submodules = 1;
	rev.abbrev = 0;

	add_head_to_pending(&rev);
	diff_setup_done(&rev.diffopt);

	result = run_diff_index(&rev, 1);
	if (diff_result_code(&rev.diffopt, result))
		return 1;

	object_array_clear(&rev.pending);
	result = run_diff_files(&rev, 0);
	if (diff_result_code(&rev.diffopt, result))
		return 1;

	return 0;
}

static int evaluate_result(void)
{
	int cnt = 0;
	struct rev_info rev;

	if (read_cache() < 0)
		die("failed to read the cache");

	/* Check how many files differ. */
	init_revisions(&rev, "");
	setup_revisions(0, NULL, &rev, NULL);
	rev.diffopt.output_format |=
		DIFF_FORMAT_CALLBACK;
	rev.diffopt.format_callback = count_diff_files;
	rev.diffopt.format_callback_data = &cnt;
	run_diff_files(&rev, 0);

	/*
	 * Check how many unmerged entries are
	 * there.
	 */
	cnt += count_unmerged_entries();

	return cnt;
}

int cmd_diff_files(int argc, const char **argv, const char *prefix)
{
	struct rev_info rev;
	int result;
	unsigned options = 0;

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

	git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
	init_revisions(&rev, prefix);
	rev.abbrev = 0;
	precompose_argv(argc, argv);

	argc = setup_revisions(argc, argv, &rev, NULL);
	while (1 < argc && argv[1][0] == '-') {
		if (!strcmp(argv[1], "--base"))
			rev.max_count = 1;
		else if (!strcmp(argv[1], "--ours"))
			rev.max_count = 2;
		else if (!strcmp(argv[1], "--theirs"))
			rev.max_count = 3;
		else if (!strcmp(argv[1], "-q"))
			options |= DIFF_SILENT_ON_REMOVED;
		else
			usage(diff_files_usage);
		argv++; argc--;
	}
	if (!rev.diffopt.output_format)
		rev.diffopt.output_format = DIFF_FORMAT_RAW;

	/*
	 * Make sure there are NO revision (i.e. pending object) parameter,
	 * rev.max_count is reasonable (0 <= n <= 3), and
	 * there is no other revision filtering parameters.
	 */
	if (rev.pending.nr ||
	    rev.min_age != -1 || rev.max_age != -1 ||
	    3 < rev.max_count)
		usage(diff_files_usage);

	/*
	 * "diff-files --base -p" should not combine merges because it
	 * was not asked to.  "diff-files -c -p" should not densify
	 * (the user should ask with "diff-files --cc" explicitly).
	 */
	if (rev.max_count == -1 && !rev.combine_merges &&
	    (rev.diffopt.output_format & DIFF_FORMAT_PATCH))
		rev.combine_merges = rev.dense_combined_merges = 1;

	if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
		perror("read_cache_preload");
		return -1;
	}
	result = run_diff_files(&rev, options);
	return diff_result_code(&rev.diffopt, result);
}

static void wt_status_print_changed(struct wt_status *s)
{
    struct rev_info rev;
    init_revisions(&rev, "");
    setup_revisions(0, NULL, &rev, NULL);
    rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
    rev.diffopt.format_callback = wt_status_print_changed_cb;
    rev.diffopt.format_callback_data = s;
    run_diff_files(&rev, 0);
}

/**
 * Returns 1 if there are unstaged changes, 0 otherwise.
 */
static int has_unstaged_changes(const char *prefix)
{
	struct rev_info rev_info;
	int result;

	init_revisions(&rev_info, prefix);
	DIFF_OPT_SET(&rev_info.diffopt, IGNORE_SUBMODULES);
	DIFF_OPT_SET(&rev_info.diffopt, QUICK);
	diff_setup_done(&rev_info.diffopt);
	result = run_diff_files(&rev_info, 0);
	return diff_result_code(&rev_info.diffopt, result);
}

static void wt_status_print_verbose(struct wt_status *s)
{
	struct rev_info rev;
	struct setup_revision_opt opt;
	int dirty_submodules;
	const char *c = color(WT_STATUS_HEADER, s);

	init_revisions(&rev, NULL);
	DIFF_OPT_SET(&rev.diffopt, ALLOW_TEXTCONV);

	memset(&opt, 0, sizeof(opt));
	opt.def = s->is_initial ? EMPTY_TREE_SHA1_HEX : s->reference;
	setup_revisions(0, NULL, &rev, &opt);

	rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
	rev.diffopt.detect_rename = 1;
	rev.diffopt.file = s->fp;
	rev.diffopt.close_file = 0;
	/*
	 * If we're not going to stdout, then we definitely don't
	 * want color, since we are going to the commit message
	 * file (and even the "auto" setting won't work, since it
	 * will have checked isatty on stdout). But we then do want
	 * to insert the scissor line here to reliably remove the
	 * diff before committing.
	 */
	if (s->fp != stdout) {
		rev.diffopt.use_color = 0;
		wt_status_add_cut_line(s->fp);
	}
	if (s->verbose > 1 && s->commitable) {
		/* print_updated() printed a header, so do we */
		if (s->fp != stdout)
			wt_status_print_trailer(s);
		status_printf_ln(s, c, _("Changes to be committed:"));
		rev.diffopt.a_prefix = "c/";
		rev.diffopt.b_prefix = "i/";
	} /* else use prefix as per user config */
	run_diff_index(&rev, 1);
	if (s->verbose > 1 &&
	    wt_status_check_worktree_changes(s, &dirty_submodules)) {
		status_printf_ln(s, c,
			"--------------------------------------------------");
		status_printf_ln(s, c, _("Changes not staged for commit:"));
		setup_work_tree();
		rev.diffopt.a_prefix = "i/";
		rev.diffopt.b_prefix = "w/";
		run_diff_files(&rev, 0);
	}
}

static int edit_patch(int argc, const char **argv, const char *prefix)
{
	char *file = git_pathdup("ADD_EDIT.patch");
	const char *apply_argv[] = { "apply", "--recount", "--cached",
		NULL, NULL };
	struct child_process child = CHILD_PROCESS_INIT;
	struct rev_info rev;
	int out;
	struct stat st;

	apply_argv[3] = file;

	git_config(git_diff_basic_config, NULL); /* no "diff" UI options */

	if (read_cache() < 0)
		die(_("Could not read the index"));

	repo_init_revisions(the_repository, &rev, prefix);
	rev.diffopt.context = 7;

	argc = setup_revisions(argc, argv, &rev, NULL);
	rev.diffopt.output_format = DIFF_FORMAT_PATCH;
	rev.diffopt.use_color = 0;
	rev.diffopt.flags.ignore_dirty_submodules = 1;
	out = open(file, O_CREAT | O_WRONLY | O_TRUNC, 0666);
	if (out < 0)
		die(_("Could not open '%s' for writing."), file);
	rev.diffopt.file = xfdopen(out, "w");
	rev.diffopt.close_file = 1;
	if (run_diff_files(&rev, 0))
		die(_("Could not write patch"));

	if (launch_editor(file, NULL, NULL))
		die(_("editing patch failed"));

	if (stat(file, &st))
		die_errno(_("Could not stat '%s'"), file);
	if (!st.st_size)
		die(_("Empty patch. Aborted."));

	child.git_cmd = 1;
	child.argv = apply_argv;
	if (run_command(&child))
		die(_("Could not apply '%s'"), file);

	unlink(file);
	free(file);
	return 0;
}

static int edit_patch(int argc, const char **argv, const char *prefix)
{
	char *file = git_pathdup("ADD_EDIT.patch");
	const char *apply_argv[] = { "apply", "--recount", "--cached",
		NULL, NULL };
	struct child_process child;
	struct rev_info rev;
	int out;
	struct stat st;

	apply_argv[3] = file;

	git_config(git_diff_basic_config, NULL); /* no "diff" UI options */

	if (read_cache() < 0)
		die(_("Could not read the index"));

	init_revisions(&rev, prefix);
	rev.diffopt.context = 7;

	argc = setup_revisions(argc, argv, &rev, NULL);
	rev.diffopt.output_format = DIFF_FORMAT_PATCH;
	rev.diffopt.use_color = 0;
	DIFF_OPT_SET(&rev.diffopt, IGNORE_DIRTY_SUBMODULES);
	out = open(file, O_CREAT | O_WRONLY, 0666);
	if (out < 0)
		die(_("Could not open '%s' for writing."), file);
	rev.diffopt.file = xfdopen(out, "w");
	rev.diffopt.close_file = 1;
	if (run_diff_files(&rev, 0))
		die(_("Could not write patch"));

	launch_editor(file, NULL, NULL);

	if (stat(file, &st))
		die_errno(_("Could not stat '%s'"), file);
	if (!st.st_size)
		die(_("Empty patch. Aborted."));

	memset(&child, 0, sizeof(child));
	child.git_cmd = 1;
	child.argv = apply_argv;
	if (run_command(&child))
		die(_("Could not apply '%s'"), file);

	unlink(file);
	free(file);
	return 0;
}

int add_files_to_cache(const char *prefix, const char **pathspec, int flags)
{
	struct update_callback_data data;
	struct rev_info rev;
	init_revisions(&rev, prefix);
	setup_revisions(0, NULL, &rev, NULL);
	rev.prune_data = pathspec;
	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
	rev.diffopt.format_callback = update_callback;
	data.flags = flags;
	data.add_errors = 0;
	rev.diffopt.format_callback_data = &data;
	run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
	return !!data.add_errors;
}

static void update_files_in_cache(const char *prefix,
				  const struct pathspec *pathspec,
				  struct update_callback_data *data)
{
	struct rev_info rev;

	init_revisions(&rev, prefix);
	setup_revisions(0, NULL, &rev, NULL);
	if (pathspec)
		copy_pathspec(&rev.prune_data, pathspec);
	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
	rev.diffopt.format_callback = update_callback;
	rev.diffopt.format_callback_data = data;
	rev.max_count = 0; /* do not compare unmerged paths with stage #2 */
	run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
}

static void wt_status_collect_changes_worktree(struct wt_status *s)
{
	struct rev_info rev;

	init_revisions(&rev, NULL);
	setup_revisions(0, NULL, &rev, NULL);
	rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
	DIFF_OPT_SET(&rev.diffopt, DIRTY_SUBMODULES);
	if (!s->show_untracked_files)
		DIFF_OPT_SET(&rev.diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
	if (s->ignore_submodule_arg)
		handle_ignore_submodules_arg(&rev.diffopt, s->ignore_submodule_arg);
	rev.diffopt.format_callback = wt_status_collect_changed_cb;
	rev.diffopt.format_callback_data = s;
	rev.prune_data = s->pathspec;
	run_diff_files(&rev, 0);
}

int add_files_to_cache(const char *prefix,
		       const struct pathspec *pathspec, int flags)
{
	struct update_callback_data data;
	struct rev_info rev;

	memset(&data, 0, sizeof(data));
	data.flags = flags;

	init_revisions(&rev, prefix);
	setup_revisions(0, NULL, &rev, NULL);
	if (pathspec)
		copy_pathspec(&rev.prune_data, pathspec);
	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
	rev.diffopt.format_callback = update_callback;
	rev.diffopt.format_callback_data = &data;
	rev.max_count = 0; /* do not compare unmerged paths with stage #2 */
	run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
	return !!data.add_errors;
}

static int builtin_diff_files(struct rev_info *revs, int argc, const char **argv)
{
    int result;
    unsigned int options = 0;

    while (1 < argc && argv[1][0] == '-') {
        if (!strcmp(argv[1], "--base"))
            revs->max_count = 1;
        else if (!strcmp(argv[1], "--ours"))
            revs->max_count = 2;
        else if (!strcmp(argv[1], "--theirs"))
            revs->max_count = 3;
        else if (!strcmp(argv[1], "-q"))
            options |= DIFF_SILENT_ON_REMOVED;
        else if (!strcmp(argv[1], "-h"))
            usage(builtin_diff_usage);
        else
            return error("invalid option: %s", argv[1]);
        argv++;
        argc--;
    }

    /*
     * "diff --base" should not combine merges because it was not
     * asked to.  "diff -c" should not densify (if the user wants
     * dense one, --cc can be explicitly asked for, or just rely
     * on the default).
     */
    if (revs->max_count == -1 && !revs->combine_merges &&
            (revs->diffopt.output_format & DIFF_FORMAT_PATCH))
        revs->combine_merges = revs->dense_combined_merges = 1;

    setup_work_tree();
    if (read_cache_preload(revs->diffopt.paths) < 0) {
        perror("read_cache_preload");
        return -1;
    }
    result = run_diff_files(revs, options);
    return diff_result_code(&revs->diffopt, result);
}