Adding upstream version 1:2.43.0.upstream/1%2.43.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2544 insertions, 0 deletions

diff --git a/builtin/log.c b/builtin/log.c
new file mode 100644
index 0000000..ba775d7
--- /dev/null
+++ b/builtin/log.c
@@ -0,0 +1,2544 @@
+/*
+ * Builtin "git log" and related commands (show, whatchanged)
+ *
+ * (C) Copyright 2006 Linus Torvalds
+ *		 2006 Junio Hamano
+ */
+#include "git-compat-util.h"
+#include "abspath.h"
+#include "config.h"
+#include "environment.h"
+#include "gettext.h"
+#include "hex.h"
+#include "refs.h"
+#include "object-file.h"
+#include "object-name.h"
+#include "object-store-ll.h"
+#include "pager.h"
+#include "color.h"
+#include "commit.h"
+#include "diff.h"
+#include "diff-merges.h"
+#include "revision.h"
+#include "log-tree.h"
+#include "builtin.h"
+#include "oid-array.h"
+#include "tag.h"
+#include "reflog-walk.h"
+#include "patch-ids.h"
+#include "run-command.h"
+#include "shortlog.h"
+#include "remote.h"
+#include "string-list.h"
+#include "parse-options.h"
+#include "line-log.h"
+#include "branch.h"
+#include "streaming.h"
+#include "version.h"
+#include "mailmap.h"
+#include "gpg-interface.h"
+#include "progress.h"
+#include "commit-slab.h"
+#include "repository.h"
+#include "commit-reach.h"
+#include "range-diff.h"
+#include "tmp-objdir.h"
+#include "tree.h"
+#include "write-or-die.h"
+
+#define MAIL_DEFAULT_WRAP 72
+#define COVER_FROM_AUTO_MAX_SUBJECT_LEN 100
+#define FORMAT_PATCH_NAME_MAX_DEFAULT 64
+
+/* Set a default date-time format for git log ("log.date" config variable) */
+static const char *default_date_mode = NULL;
+
+static int default_abbrev_commit;
+static int default_show_root = 1;
+static int default_follow;
+static int default_show_signature;
+static int default_encode_email_headers = 1;
+static int decoration_style;
+static int decoration_given;
+static int use_mailmap_config = 1;
+static unsigned int force_in_body_from;
+static int stdout_mboxrd;
+static const char *fmt_patch_subject_prefix = "PATCH";
+static int fmt_patch_name_max = FORMAT_PATCH_NAME_MAX_DEFAULT;
+static const char *fmt_pretty;
+static int format_no_prefix;
+
+static const char * const builtin_log_usage[] = {
+	N_("git log [<options>] [<revision-range>] [[--] <path>...]"),
+	N_("git show [<options>] <object>..."),
+	NULL
+};
+
+struct line_opt_callback_data {
+	struct rev_info *rev;
+	const char *prefix;
+	struct string_list args;
+};
+
+static int session_is_interactive(void)
+{
+	return isatty(1) || pager_in_use();
+}
+
+static int auto_decoration_style(void)
+{
+	return session_is_interactive() ? DECORATE_SHORT_REFS : 0;
+}
+
+static int parse_decoration_style(const char *value)
+{
+	switch (git_parse_maybe_bool(value)) {
+	case 1:
+		return DECORATE_SHORT_REFS;
+	case 0:
+		return 0;
+	default:
+		break;
+	}
+	if (!strcmp(value, "full"))
+		return DECORATE_FULL_REFS;
+	else if (!strcmp(value, "short"))
+		return DECORATE_SHORT_REFS;
+	else if (!strcmp(value, "auto"))
+		return auto_decoration_style();
+	/*
+	 * Please update _git_log() in git-completion.bash when you
+	 * add new decoration styles.
+	 */
+	return -1;
+}
+
+static int use_default_decoration_filter = 1;
+static struct string_list decorate_refs_exclude = STRING_LIST_INIT_NODUP;
+static struct string_list decorate_refs_exclude_config = STRING_LIST_INIT_NODUP;
+static struct string_list decorate_refs_include = STRING_LIST_INIT_NODUP;
+
+static int clear_decorations_callback(const struct option *opt UNUSED,
+				      const char *arg, int unset)
+{
+	BUG_ON_OPT_NEG(unset);
+	BUG_ON_OPT_ARG(arg);
+	string_list_clear(&decorate_refs_include, 0);
+	string_list_clear(&decorate_refs_exclude, 0);
+	use_default_decoration_filter = 0;
+	return 0;
+}
+
+static int decorate_callback(const struct option *opt UNUSED, const char *arg,
+			     int unset)
+{
+	if (unset)
+		decoration_style = 0;
+	else if (arg)
+		decoration_style = parse_decoration_style(arg);
+	else
+		decoration_style = DECORATE_SHORT_REFS;
+
+	if (decoration_style < 0)
+		die(_("invalid --decorate option: %s"), arg);
+
+	decoration_given = 1;
+
+	return 0;
+}
+
+static int log_line_range_callback(const struct option *option, const char *arg, int unset)
+{
+	struct line_opt_callback_data *data = option->value;
+
+	BUG_ON_OPT_NEG(unset);
+
+	if (!arg)
+		return -1;
+
+	data->rev->line_level_traverse = 1;
+	string_list_append(&data->args, arg);
+
+	return 0;
+}
+
+static void init_log_defaults(void)
+{
+	init_diff_ui_defaults();
+
+	decoration_style = auto_decoration_style();
+}
+
+static void cmd_log_init_defaults(struct rev_info *rev)
+{
+	if (fmt_pretty)
+		get_commit_format(fmt_pretty, rev);
+	if (default_follow)
+		rev->diffopt.flags.default_follow_renames = 1;
+	rev->verbose_header = 1;
+	init_diffstat_widths(&rev->diffopt);
+	rev->diffopt.flags.recursive = 1;
+	rev->diffopt.flags.allow_textconv = 1;
+	rev->abbrev_commit = default_abbrev_commit;
+	rev->show_root_diff = default_show_root;
+	rev->subject_prefix = fmt_patch_subject_prefix;
+	rev->patch_name_max = fmt_patch_name_max;
+	rev->show_signature = default_show_signature;
+	rev->encode_email_headers = default_encode_email_headers;
+
+	if (default_date_mode)
+		parse_date_format(default_date_mode, &rev->date_mode);
+}
+
+static void set_default_decoration_filter(struct decoration_filter *decoration_filter)
+{
+	int i;
+	char *value = NULL;
+	struct string_list *include = decoration_filter->include_ref_pattern;
+	const struct string_list *config_exclude;
+
+	if (!git_config_get_string_multi("log.excludeDecoration",
+					 &config_exclude)) {
+		struct string_list_item *item;
+		for_each_string_list_item(item, config_exclude)
+			string_list_append(decoration_filter->exclude_ref_config_pattern,
+					   item->string);
+	}
+
+	/*
+	 * By default, decorate_all is disabled. Enable it if
+	 * log.initialDecorationSet=all. Don't ever disable it by config,
+	 * since the command-line takes precedent.
+	 */
+	if (use_default_decoration_filter &&
+	    !git_config_get_string("log.initialdecorationset", &value) &&
+	    !strcmp("all", value))
+		use_default_decoration_filter = 0;
+	free(value);
+
+	if (!use_default_decoration_filter ||
+	    decoration_filter->exclude_ref_pattern->nr ||
+	    decoration_filter->include_ref_pattern->nr ||
+	    decoration_filter->exclude_ref_config_pattern->nr)
+		return;
+
+	/*
+	 * No command-line or config options were given, so
+	 * populate with sensible defaults.
+	 */
+	for (i = 0; i < ARRAY_SIZE(ref_namespace); i++) {
+		if (!ref_namespace[i].decoration)
+			continue;
+
+		string_list_append(include, ref_namespace[i].ref);
+	}
+}
+
+static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
+			 struct rev_info *rev, struct setup_revision_opt *opt)
+{
+	struct userformat_want w;
+	int quiet = 0, source = 0, mailmap;
+	static struct line_opt_callback_data line_cb = {NULL, NULL, STRING_LIST_INIT_DUP};
+	struct decoration_filter decoration_filter = {
+		.exclude_ref_pattern = &decorate_refs_exclude,
+		.include_ref_pattern = &decorate_refs_include,
+		.exclude_ref_config_pattern = &decorate_refs_exclude_config,
+	};
+	static struct revision_sources revision_sources;
+
+	const struct option builtin_log_options[] = {
+		OPT__QUIET(&quiet, N_("suppress diff output")),
+		OPT_BOOL(0, "source", &source, N_("show source")),
+		OPT_BOOL(0, "use-mailmap", &mailmap, N_("use mail map file")),
+		OPT_ALIAS(0, "mailmap", "use-mailmap"),
+		OPT_CALLBACK_F(0, "clear-decorations", NULL, NULL,
+			       N_("clear all previously-defined decoration filters"),
+			       PARSE_OPT_NOARG | PARSE_OPT_NONEG,
+			       clear_decorations_callback),
+		OPT_STRING_LIST(0, "decorate-refs", &decorate_refs_include,
+				N_("pattern"), N_("only decorate refs that match <pattern>")),
+		OPT_STRING_LIST(0, "decorate-refs-exclude", &decorate_refs_exclude,
+				N_("pattern"), N_("do not decorate refs that match <pattern>")),
+		OPT_CALLBACK_F(0, "decorate", NULL, NULL, N_("decorate options"),
+			       PARSE_OPT_OPTARG, decorate_callback),
+		OPT_CALLBACK('L', NULL, &line_cb, "range:file",
+			     N_("trace the evolution of line range <start>,<end> or function :<funcname> in <file>"),
+			     log_line_range_callback),
+		OPT_END()
+	};
+
+	line_cb.rev = rev;
+	line_cb.prefix = prefix;
+
+	mailmap = use_mailmap_config;
+	argc = parse_options(argc, argv, prefix,
+			     builtin_log_options, builtin_log_usage,
+			     PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN_OPT |
+			     PARSE_OPT_KEEP_DASHDASH);
+
+	if (quiet)
+		rev->diffopt.output_format |= DIFF_FORMAT_NO_OUTPUT;
+	argc = setup_revisions(argc, argv, rev, opt);
+
+	/* Any arguments at this point are not recognized */
+	if (argc > 1)
+		die(_("unrecognized argument: %s"), argv[1]);
+
+	if (rev->line_level_traverse && rev->prune_data.nr)
+		die(_("-L<range>:<file> cannot be used with pathspec"));
+
+	memset(&w, 0, sizeof(w));
+	userformat_find_requirements(NULL, &w);
+
+	if (!rev->show_notes_given && (!rev->pretty_given || w.notes))
+		rev->show_notes = 1;
+	if (rev->show_notes)
+		load_display_notes(&rev->notes_opt);
+
+	if ((rev->diffopt.pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) ||
+	    rev->diffopt.filter || rev->diffopt.flags.follow_renames)
+		rev->always_show_header = 0;
+
+	if (source || w.source) {
+		init_revision_sources(&revision_sources);
+		rev->sources = &revision_sources;
+	}
+
+	if (mailmap) {
+		rev->mailmap = xmalloc(sizeof(struct string_list));
+		string_list_init_nodup(rev->mailmap);
+		read_mailmap(rev->mailmap);
+	}
+
+	if (rev->pretty_given && rev->commit_format == CMIT_FMT_RAW) {
+		/*
+		 * "log --pretty=raw" is special; ignore UI oriented
+		 * configuration variables such as decoration.
+		 */
+		if (!decoration_given)
+			decoration_style = 0;
+		if (!rev->abbrev_commit_given)
+			rev->abbrev_commit = 0;
+	}
+
+	if (rev->commit_format == CMIT_FMT_USERFORMAT) {
+		if (!w.decorate) {
+			/*
+			 * Disable decoration loading if the format will not
+			 * show them anyway.
+			 */
+			decoration_style = 0;
+		} else if (!decoration_style) {
+			/*
+			 * If we are going to show them, make sure we do load
+			 * them here, but taking care not to override a
+			 * specific style set by config or --decorate.
+			 */
+			decoration_style = DECORATE_SHORT_REFS;
+		}
+	}
+
+	if (decoration_style || rev->simplify_by_decoration) {
+		set_default_decoration_filter(&decoration_filter);
+
+		if (decoration_style)
+			rev->show_decorations = 1;
+
+		load_ref_decorations(&decoration_filter, decoration_style);
+	}
+
+	if (rev->line_level_traverse)
+		line_log_init(rev, line_cb.prefix, &line_cb.args);
+
+	setup_pager();
+}
+
+static void cmd_log_init(int argc, const char **argv, const char *prefix,
+			 struct rev_info *rev, struct setup_revision_opt *opt)
+{
+	cmd_log_init_defaults(rev);
+	cmd_log_init_finish(argc, argv, prefix, rev, opt);
+}
+
+static int cmd_log_deinit(int ret, struct rev_info *rev)
+{
+	release_revisions(rev);
+	return ret;
+}
+
+/*
+ * This gives a rough estimate for how many commits we
+ * will print out in the list.
+ */
+static int estimate_commit_count(struct commit_list *list)
+{
+	int n = 0;
+
+	while (list) {
+		struct commit *commit = list->item;
+		unsigned int flags = commit->object.flags;
+		list = list->next;
+		if (!(flags & (TREESAME | UNINTERESTING)))
+			n++;
+	}
+	return n;
+}
+
+static void show_early_header(struct rev_info *rev, const char *stage, int nr)
+{
+	if (rev->shown_one) {
+		rev->shown_one = 0;
+		if (rev->commit_format != CMIT_FMT_ONELINE)
+			putchar(rev->diffopt.line_termination);
+	}
+	fprintf(rev->diffopt.file, _("Final output: %d %s\n"), nr, stage);
+}
+
+static struct itimerval early_output_timer;
+
+static void log_show_early(struct rev_info *revs, struct commit_list *list)
+{
+	int i = revs->early_output;
+	int show_header = 1;
+	int no_free = revs->diffopt.no_free;
+
+	revs->diffopt.no_free = 0;
+	sort_in_topological_order(&list, revs->sort_order);
+	while (list && i) {
+		struct commit *commit = list->item;
+		switch (simplify_commit(revs, commit)) {
+		case commit_show:
+			if (show_header) {
+				int n = estimate_commit_count(list);
+				show_early_header(revs, "incomplete", n);
+				show_header = 0;
+			}
+			log_tree_commit(revs, commit);
+			i--;
+			break;
+		case commit_ignore:
+			break;
+		case commit_error:
+			revs->diffopt.no_free = no_free;
+			diff_free(&revs->diffopt);
+			return;
+		}
+		list = list->next;
+	}
+
+	/* Did we already get enough commits for the early output? */
+	if (!i) {
+		revs->diffopt.no_free = 0;
+		diff_free(&revs->diffopt);
+		return;
+	}
+
+	/*
+	 * ..if no, then repeat it twice a second until we
+	 * do.
+	 *
+	 * NOTE! We don't use "it_interval", because if the
+	 * reader isn't listening, we want our output to be
+	 * throttled by the writing, and not have the timer
+	 * trigger every second even if we're blocked on a
+	 * reader!
+	 */
+	early_output_timer.it_value.tv_sec = 0;
+	early_output_timer.it_value.tv_usec = 500000;
+	setitimer(ITIMER_REAL, &early_output_timer, NULL);
+}
+
+static void early_output(int signal UNUSED)
+{
+	show_early_output = log_show_early;
+}
+
+static void setup_early_output(void)
+{
+	struct sigaction sa;
+
+	/*
+	 * Set up the signal handler, minimally intrusively:
+	 * we only set a single volatile integer word (not
+	 * using sigatomic_t - trying to avoid unnecessary
+	 * system dependencies and headers), and using
+	 * SA_RESTART.
+	 */
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = early_output;
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = SA_RESTART;
+	sigaction(SIGALRM, &sa, NULL);
+
+	/*
+	 * If we can get the whole output in less than a
+	 * tenth of a second, don't even bother doing the
+	 * early-output thing..
+	 *
+	 * This is a one-time-only trigger.
+	 */
+	early_output_timer.it_value.tv_sec = 0;
+	early_output_timer.it_value.tv_usec = 100000;
+	setitimer(ITIMER_REAL, &early_output_timer, NULL);
+}
+
+static void finish_early_output(struct rev_info *rev)
+{
+	int n = estimate_commit_count(rev->commits);
+	signal(SIGALRM, SIG_IGN);
+	show_early_header(rev, "done", n);
+}
+
+static int cmd_log_walk_no_free(struct rev_info *rev)
+{
+	struct commit *commit;
+	int saved_nrl = 0;
+	int saved_dcctc = 0;
+
+	if (rev->remerge_diff) {
+		rev->remerge_objdir = tmp_objdir_create("remerge-diff");
+		if (!rev->remerge_objdir)
+			die(_("unable to create temporary object directory"));
+		tmp_objdir_replace_primary_odb(rev->remerge_objdir, 1);
+	}
+
+	if (rev->early_output)
+		setup_early_output();
+
+	if (prepare_revision_walk(rev))
+		die(_("revision walk setup failed"));
+
+	if (rev->early_output)
+		finish_early_output(rev);
+
+	/*
+	 * For --check and --exit-code, the exit code is based on CHECK_FAILED
+	 * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
+	 * retain that state information if replacing rev->diffopt in this loop
+	 */
+	while ((commit = get_revision(rev)) != NULL) {
+		if (!log_tree_commit(rev, commit) && rev->max_count >= 0)
+			/*
+			 * We decremented max_count in get_revision,
+			 * but we didn't actually show the commit.
+			 */
+			rev->max_count++;
+		if (!rev->reflog_info) {
+			/*
+			 * We may show a given commit multiple times when
+			 * walking the reflogs.
+			 */
+			free_commit_buffer(the_repository->parsed_objects,
+					   commit);
+			free_commit_list(commit->parents);
+			commit->parents = NULL;
+		}
+		if (saved_nrl < rev->diffopt.needed_rename_limit)
+			saved_nrl = rev->diffopt.needed_rename_limit;
+		if (rev->diffopt.degraded_cc_to_c)
+			saved_dcctc = 1;
+	}
+	rev->diffopt.degraded_cc_to_c = saved_dcctc;
+	rev->diffopt.needed_rename_limit = saved_nrl;
+
+	if (rev->remerge_diff) {
+		tmp_objdir_destroy(rev->remerge_objdir);
+		rev->remerge_objdir = NULL;
+	}
+
+	if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
+	    rev->diffopt.flags.check_failed) {
+		return 02;
+	}
+	return diff_result_code(&rev->diffopt);
+}
+
+static int cmd_log_walk(struct rev_info *rev)
+{
+	int retval;
+
+	rev->diffopt.no_free = 1;
+	retval = cmd_log_walk_no_free(rev);
+	rev->diffopt.no_free = 0;
+	diff_free(&rev->diffopt);
+	return retval;
+}
+
+static int git_log_config(const char *var, const char *value,
+			  const struct config_context *ctx, void *cb)
+{
+	const char *slot_name;
+
+	if (!strcmp(var, "format.pretty"))
+		return git_config_string(&fmt_pretty, var, value);
+	if (!strcmp(var, "format.subjectprefix"))
+		return git_config_string(&fmt_patch_subject_prefix, var, value);
+	if (!strcmp(var, "format.filenamemaxlength")) {
+		fmt_patch_name_max = git_config_int(var, value, ctx->kvi);
+		return 0;
+	}
+	if (!strcmp(var, "format.encodeemailheaders")) {
+		default_encode_email_headers = git_config_bool(var, value);
+		return 0;
+	}
+	if (!strcmp(var, "log.abbrevcommit")) {
+		default_abbrev_commit = git_config_bool(var, value);
+		return 0;
+	}
+	if (!strcmp(var, "log.date"))
+		return git_config_string(&default_date_mode, var, value);
+	if (!strcmp(var, "log.decorate")) {
+		decoration_style = parse_decoration_style(value);
+		if (decoration_style < 0)
+			decoration_style = 0; /* maybe warn? */
+		return 0;
+	}
+	if (!strcmp(var, "log.diffmerges"))
+		return diff_merges_config(value);
+	if (!strcmp(var, "log.showroot")) {
+		default_show_root = git_config_bool(var, value);
+		return 0;
+	}
+	if (!strcmp(var, "log.follow")) {
+		default_follow = git_config_bool(var, value);
+		return 0;
+	}
+	if (skip_prefix(var, "color.decorate.", &slot_name))
+		return parse_decorate_color_config(var, slot_name, value);
+	if (!strcmp(var, "log.mailmap")) {
+		use_mailmap_config = git_config_bool(var, value);
+		return 0;
+	}
+	if (!strcmp(var, "log.showsignature")) {
+		default_show_signature = git_config_bool(var, value);
+		return 0;
+	}
+
+	return git_diff_ui_config(var, value, ctx, cb);
+}
+
+int cmd_whatchanged(int argc, const char **argv, const char *prefix)
+{
+	struct rev_info rev;
+	struct setup_revision_opt opt;
+
+	init_log_defaults();
+	git_config(git_log_config, NULL);
+
+	repo_init_revisions(the_repository, &rev, prefix);
+	git_config(grep_config, &rev.grep_filter);
+
+	rev.diff = 1;
+	rev.simplify_history = 0;
+	memset(&opt, 0, sizeof(opt));
+	opt.def = "HEAD";
+	opt.revarg_opt = REVARG_COMMITTISH;
+	cmd_log_init(argc, argv, prefix, &rev, &opt);
+	if (!rev.diffopt.output_format)
+		rev.diffopt.output_format = DIFF_FORMAT_RAW;
+	return cmd_log_deinit(cmd_log_walk(&rev), &rev);
+}
+
+static void show_tagger(const char *buf, struct rev_info *rev)
+{
+	struct strbuf out = STRBUF_INIT;
+	struct pretty_print_context pp = {0};
+
+	pp.fmt = rev->commit_format;
+	pp.date_mode = rev->date_mode;
+	pp_user_info(&pp, "Tagger", &out, buf, get_log_output_encoding());
+	fprintf(rev->diffopt.file, "%s", out.buf);
+	strbuf_release(&out);
+}
+
+static int show_blob_object(const struct object_id *oid, struct rev_info *rev, const char *obj_name)
+{
+	struct object_id oidc;
+	struct object_context obj_context;
+	char *buf;
+	unsigned long size;
+
+	fflush(rev->diffopt.file);
+	if (!rev->diffopt.flags.textconv_set_via_cmdline ||
+	    !rev->diffopt.flags.allow_textconv)
+		return stream_blob_to_fd(1, oid, NULL, 0);
+
+	if (get_oid_with_context(the_repository, obj_name,
+				 GET_OID_RECORD_PATH,
+				 &oidc, &obj_context))
+		die(_("not a valid object name %s"), obj_name);
+	if (!obj_context.path ||
+	    !textconv_object(the_repository, obj_context.path,
+			     obj_context.mode, &oidc, 1, &buf, &size)) {
+		free(obj_context.path);
+		return stream_blob_to_fd(1, oid, NULL, 0);
+	}
+
+	if (!buf)
+		die(_("git show %s: bad file"), obj_name);
+
+	write_or_die(1, buf, size);
+	free(obj_context.path);
+	return 0;
+}
+
+static int show_tag_object(const struct object_id *oid, struct rev_info *rev)
+{
+	unsigned long size;
+	enum object_type type;
+	char *buf = repo_read_object_file(the_repository, oid, &type, &size);
+	int offset = 0;
+
+	if (!buf)
+		return error(_("could not read object %s"), oid_to_hex(oid));
+
+	assert(type == OBJ_TAG);
+	while (offset < size && buf[offset] != '\n') {
+		int new_offset = offset + 1;
+		const char *ident;
+		while (new_offset < size && buf[new_offset++] != '\n')
+			; /* do nothing */
+		if (skip_prefix(buf + offset, "tagger ", &ident))
+			show_tagger(ident, rev);
+		offset = new_offset;
+	}
+
+	if (offset < size)
+		fwrite(buf + offset, size - offset, 1, rev->diffopt.file);
+	free(buf);
+	return 0;
+}
+
+static int show_tree_object(const struct object_id *oid UNUSED,
+			    struct strbuf *base UNUSED,
+			    const char *pathname, unsigned mode,
+			    void *context)
+{
+	FILE *file = context;
+	fprintf(file, "%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
+	return 0;
+}
+
+static void show_setup_revisions_tweak(struct rev_info *rev)
+{
+	if (rev->first_parent_only)
+		diff_merges_default_to_first_parent(rev);
+	else
+		diff_merges_default_to_dense_combined(rev);
+	if (!rev->diffopt.output_format)
+		rev->diffopt.output_format = DIFF_FORMAT_PATCH;
+}
+
+int cmd_show(int argc, const char **argv, const char *prefix)
+{
+	struct rev_info rev;
+	unsigned int i;
+	struct setup_revision_opt opt;
+	struct pathspec match_all;
+	int ret = 0;
+
+	init_log_defaults();
+	git_config(git_log_config, NULL);
+
+	if (the_repository->gitdir) {
+		prepare_repo_settings(the_repository);
+		the_repository->settings.command_requires_full_index = 0;
+	}
+
+	memset(&match_all, 0, sizeof(match_all));
+	repo_init_revisions(the_repository, &rev, prefix);
+	git_config(grep_config, &rev.grep_filter);
+
+	rev.diff = 1;
+	rev.always_show_header = 1;
+	rev.no_walk = 1;
+	rev.diffopt.stat_width = -1; 	/* Scale to real terminal size */
+
+	memset(&opt, 0, sizeof(opt));
+	opt.def = "HEAD";
+	opt.tweak = show_setup_revisions_tweak;
+	cmd_log_init(argc, argv, prefix, &rev, &opt);
+
+	if (!rev.no_walk)
+		return cmd_log_deinit(cmd_log_walk(&rev), &rev);
+
+	rev.diffopt.no_free = 1;
+	for (i = 0; i < rev.pending.nr && !ret; i++) {
+		struct object *o = rev.pending.objects[i].item;
+		const char *name = rev.pending.objects[i].name;
+		switch (o->type) {
+		case OBJ_BLOB:
+			ret = show_blob_object(&o->oid, &rev, name);
+			break;
+		case OBJ_TAG: {
+			struct tag *t = (struct tag *)o;
+			struct object_id *oid = get_tagged_oid(t);
+
+			if (rev.shown_one)
+				putchar('\n');
+			fprintf(rev.diffopt.file, "%stag %s%s\n",
+					diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
+					t->tag,
+					diff_get_color_opt(&rev.diffopt, DIFF_RESET));
+			ret = show_tag_object(&o->oid, &rev);
+			rev.shown_one = 1;
+			if (ret)
+				break;
+			o = parse_object(the_repository, oid);
+			if (!o)
+				ret = error(_("could not read object %s"),
+					    oid_to_hex(oid));
+			rev.pending.objects[i].item = o;
+			i--;
+			break;
+		}
+		case OBJ_TREE:
+			if (rev.shown_one)
+				putchar('\n');
+			fprintf(rev.diffopt.file, "%stree %s%s\n\n",
+					diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
+					name,
+					diff_get_color_opt(&rev.diffopt, DIFF_RESET));
+			read_tree(the_repository, (struct tree *)o,
+				  &match_all, show_tree_object,
+				  rev.diffopt.file);
+			rev.shown_one = 1;
+			break;
+		case OBJ_COMMIT:
+		{
+			struct object_array old;
+			struct object_array blank = OBJECT_ARRAY_INIT;
+
+			memcpy(&old, &rev.pending, sizeof(old));
+			memcpy(&rev.pending, &blank, sizeof(rev.pending));
+
+			add_object_array(o, name, &rev.pending);
+			ret = cmd_log_walk_no_free(&rev);
+
+			/*
+			 * No need for
+			 * object_array_clear(&pending). It was
+			 * cleared already in prepare_revision_walk()
+			 */
+			memcpy(&rev.pending, &old, sizeof(rev.pending));
+			break;
+		}
+		default:
+			ret = error(_("unknown type: %d"), o->type);
+		}
+	}
+
+	rev.diffopt.no_free = 0;
+	diff_free(&rev.diffopt);
+
+	return cmd_log_deinit(ret, &rev);
+}
+
+/*
+ * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
+ */
+int cmd_log_reflog(int argc, const char **argv, const char *prefix)
+{
+	struct rev_info rev;
+	struct setup_revision_opt opt;
+
+	init_log_defaults();
+	git_config(git_log_config, NULL);
+
+	repo_init_revisions(the_repository, &rev, prefix);
+	init_reflog_walk(&rev.reflog_info);
+	git_config(grep_config, &rev.grep_filter);
+
+	rev.verbose_header = 1;
+	memset(&opt, 0, sizeof(opt));
+	opt.def = "HEAD";
+	cmd_log_init_defaults(&rev);
+	rev.abbrev_commit = 1;
+	rev.commit_format = CMIT_FMT_ONELINE;
+	rev.use_terminator = 1;
+	rev.always_show_header = 1;
+	cmd_log_init_finish(argc, argv, prefix, &rev, &opt);
+
+	return cmd_log_deinit(cmd_log_walk(&rev), &rev);
+}
+
+static void log_setup_revisions_tweak(struct rev_info *rev)
+{
+	if (rev->diffopt.flags.default_follow_renames &&
+	    diff_check_follow_pathspec(&rev->prune_data, 0))
+		rev->diffopt.flags.follow_renames = 1;
+
+	if (rev->first_parent_only)
+		diff_merges_default_to_first_parent(rev);
+}
+
+int cmd_log(int argc, const char **argv, const char *prefix)
+{
+	struct rev_info rev;
+	struct setup_revision_opt opt;
+
+	init_log_defaults();
+	git_config(git_log_config, NULL);
+
+	repo_init_revisions(the_repository, &rev, prefix);
+	git_config(grep_config, &rev.grep_filter);
+
+	rev.always_show_header = 1;
+	memset(&opt, 0, sizeof(opt));
+	opt.def = "HEAD";
+	opt.revarg_opt = REVARG_COMMITTISH;
+	opt.tweak = log_setup_revisions_tweak;
+	cmd_log_init(argc, argv, prefix, &rev, &opt);
+	return cmd_log_deinit(cmd_log_walk(&rev), &rev);
+}
+
+/* format-patch */
+
+static const char *fmt_patch_suffix = ".patch";
+static int numbered = 0;
+static int auto_number = 1;
+
+static char *default_attach = NULL;
+
+static struct string_list extra_hdr = STRING_LIST_INIT_NODUP;
+static struct string_list extra_to = STRING_LIST_INIT_NODUP;
+static struct string_list extra_cc = STRING_LIST_INIT_NODUP;
+
+static void add_header(const char *value)
+{
+	struct string_list_item *item;
+	int len = strlen(value);
+	while (len && value[len - 1] == '\n')
+		len--;
+
+	if (!strncasecmp(value, "to: ", 4)) {
+		item = string_list_append(&extra_to, value + 4);
+		len -= 4;
+	} else if (!strncasecmp(value, "cc: ", 4)) {
+		item = string_list_append(&extra_cc, value + 4);
+		len -= 4;
+	} else {
+		item = string_list_append(&extra_hdr, value);
+	}
+
+	item->string[len] = '\0';
+}
+
+enum cover_setting {
+	COVER_UNSET,
+	COVER_OFF,
+	COVER_ON,
+	COVER_AUTO
+};
+
+enum thread_level {
+	THREAD_UNSET,
+	THREAD_SHALLOW,
+	THREAD_DEEP
+};
+
+enum cover_from_description {
+	COVER_FROM_NONE,
+	COVER_FROM_MESSAGE,
+	COVER_FROM_SUBJECT,
+	COVER_FROM_AUTO
+};
+
+enum auto_base_setting {
+	AUTO_BASE_NEVER,
+	AUTO_BASE_ALWAYS,
+	AUTO_BASE_WHEN_ABLE
+};
+
+static enum thread_level thread;
+static int do_signoff;
+static enum auto_base_setting auto_base;
+static char *from;
+static const char *signature = git_version_string;
+static const char *signature_file;
+static enum cover_setting config_cover_letter;
+static const char *config_output_directory;
+static enum cover_from_description cover_from_description_mode = COVER_FROM_MESSAGE;
+static int show_notes;
+static struct display_notes_opt notes_opt;
+
+static enum cover_from_description parse_cover_from_description(const char *arg)
+{
+	if (!arg || !strcmp(arg, "default"))
+		return COVER_FROM_MESSAGE;
+	else if (!strcmp(arg, "none"))
+		return COVER_FROM_NONE;
+	else if (!strcmp(arg, "message"))
+		return COVER_FROM_MESSAGE;
+	else if (!strcmp(arg, "subject"))
+		return COVER_FROM_SUBJECT;
+	else if (!strcmp(arg, "auto"))
+		return COVER_FROM_AUTO;
+	else
+		die(_("%s: invalid cover from description mode"), arg);
+}
+
+static int git_format_config(const char *var, const char *value,
+			     const struct config_context *ctx, void *cb)
+{
+	if (!strcmp(var, "format.headers")) {
+		if (!value)
+			die(_("format.headers without value"));
+		add_header(value);
+		return 0;
+	}
+	if (!strcmp(var, "format.suffix"))
+		return git_config_string(&fmt_patch_suffix, var, value);
+	if (!strcmp(var, "format.to")) {
+		if (!value)
+			return config_error_nonbool(var);
+		string_list_append(&extra_to, value);
+		return 0;
+	}
+	if (!strcmp(var, "format.cc")) {
+		if (!value)
+			return config_error_nonbool(var);
+		string_list_append(&extra_cc, value);
+		return 0;
+	}
+	if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff") ||
+	    !strcmp(var, "color.ui") || !strcmp(var, "diff.submodule")) {
+		return 0;
+	}
+	if (!strcmp(var, "format.numbered")) {
+		if (value && !strcasecmp(value, "auto")) {
+			auto_number = 1;
+			return 0;
+		}
+		numbered = git_config_bool(var, value);
+		auto_number = auto_number && numbered;
+		return 0;
+	}
+	if (!strcmp(var, "format.attach")) {
+		if (value && *value)
+			default_attach = xstrdup(value);
+		else if (value && !*value)
+			FREE_AND_NULL(default_attach);
+		else
+			default_attach = xstrdup(git_version_string);
+		return 0;
+	}
+	if (!strcmp(var, "format.thread")) {
+		if (value && !strcasecmp(value, "deep")) {
+			thread = THREAD_DEEP;
+			return 0;
+		}
+		if (value && !strcasecmp(value, "shallow")) {
+			thread = THREAD_SHALLOW;
+			return 0;
+		}
+		thread = git_config_bool(var, value) ? THREAD_SHALLOW : THREAD_UNSET;
+		return 0;
+	}
+	if (!strcmp(var, "format.signoff")) {
+		do_signoff = git_config_bool(var, value);
+		return 0;
+	}
+	if (!strcmp(var, "format.signature"))
+		return git_config_string(&signature, var, value);
+	if (!strcmp(var, "format.signaturefile"))
+		return git_config_pathname(&signature_file, var, value);
+	if (!strcmp(var, "format.coverletter")) {
+		if (value && !strcasecmp(value, "auto")) {
+			config_cover_letter = COVER_AUTO;
+			return 0;
+		}
+		config_cover_letter = git_config_bool(var, value) ? COVER_ON : COVER_OFF;
+		return 0;
+	}
+	if (!strcmp(var, "format.outputdirectory"))
+		return git_config_string(&config_output_directory, var, value);
+	if (!strcmp(var, "format.useautobase")) {
+		if (value && !strcasecmp(value, "whenAble")) {
+			auto_base = AUTO_BASE_WHEN_ABLE;
+			return 0;
+		}
+		auto_base = git_config_bool(var, value) ? AUTO_BASE_ALWAYS : AUTO_BASE_NEVER;
+		return 0;
+	}
+	if (!strcmp(var, "format.from")) {
+		int b = git_parse_maybe_bool(value);
+		free(from);
+		if (b < 0)
+			from = xstrdup(value);
+		else if (b)
+			from = xstrdup(git_committer_info(IDENT_NO_DATE));
+		else
+			from = NULL;
+		return 0;
+	}
+	if (!strcmp(var, "format.forceinbodyfrom")) {
+		force_in_body_from = git_config_bool(var, value);
+		return 0;
+	}
+	if (!strcmp(var, "format.notes")) {
+		int b = git_parse_maybe_bool(value);
+		if (b < 0)
+			enable_ref_display_notes(&notes_opt, &show_notes, value);
+		else if (b)
+			enable_default_display_notes(&notes_opt, &show_notes);
+		else
+			disable_display_notes(&notes_opt, &show_notes);
+		return 0;
+	}
+	if (!strcmp(var, "format.coverfromdescription")) {
+		cover_from_description_mode = parse_cover_from_description(value);
+		return 0;
+	}
+	if (!strcmp(var, "format.mboxrd")) {
+		stdout_mboxrd = git_config_bool(var, value);
+		return 0;
+	}
+	if (!strcmp(var, "format.noprefix")) {
+		format_no_prefix = 1;
+		return 0;
+	}
+
+	/*
+	 * ignore some porcelain config which would otherwise be parsed by
+	 * git_diff_ui_config(), via git_log_config(); we can't just avoid
+	 * diff_ui_config completely, because we do care about some ui options
+	 * like color.
+	 */
+	if (!strcmp(var, "diff.noprefix"))
+		return 0;
+
+	return git_log_config(var, value, ctx, cb);
+}
+
+static const char *output_directory = NULL;
+static int outdir_offset;
+
+static int open_next_file(struct commit *commit, const char *subject,
+			 struct rev_info *rev, int quiet)
+{
+	struct strbuf filename = STRBUF_INIT;
+
+	if (output_directory) {
+		strbuf_addstr(&filename, output_directory);
+		strbuf_complete(&filename, '/');
+	}
+
+	if (rev->numbered_files)
+		strbuf_addf(&filename, "%d", rev->nr);
+	else if (commit)
+		fmt_output_commit(&filename, commit, rev);
+	else
+		fmt_output_subject(&filename, subject, rev);
+
+	if (!quiet)
+		printf("%s\n", filename.buf + outdir_offset);
+
+	if (!(rev->diffopt.file = fopen(filename.buf, "w"))) {
+		error_errno(_("cannot open patch file %s"), filename.buf);
+		strbuf_release(&filename);
+		return -1;
+	}
+
+	strbuf_release(&filename);
+	return 0;
+}
+
+static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
+{
+	struct rev_info check_rev;
+	struct commit *commit, *c1, *c2;
+	struct object *o1, *o2;
+	unsigned flags1, flags2;
+
+	if (rev->pending.nr != 2)
+		die(_("need exactly one range"));
+
+	o1 = rev->pending.objects[0].item;
+	o2 = rev->pending.objects[1].item;
+	flags1 = o1->flags;
+	flags2 = o2->flags;
+	c1 = lookup_commit_reference(the_repository, &o1->oid);
+	c2 = lookup_commit_reference(the_repository, &o2->oid);
+
+	if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
+		die(_("not a range"));
+
+	init_patch_ids(the_repository, ids);
+
+	/* given a range a..b get all patch ids for b..a */
+	repo_init_revisions(the_repository, &check_rev, rev->prefix);
+	check_rev.max_parents = 1;
+	o1->flags ^= UNINTERESTING;
+	o2->flags ^= UNINTERESTING;
+	add_pending_object(&check_rev, o1, "o1");
+	add_pending_object(&check_rev, o2, "o2");
+	if (prepare_revision_walk(&check_rev))
+		die(_("revision walk setup failed"));
+
+	while ((commit = get_revision(&check_rev)) != NULL) {
+		add_commit_patch_id(commit, ids);
+	}
+
+	/* reset for next revision walk */
+	clear_commit_marks(c1, SEEN | UNINTERESTING | SHOWN | ADDED);
+	clear_commit_marks(c2, SEEN | UNINTERESTING | SHOWN | ADDED);
+	o1->flags = flags1;
+	o2->flags = flags2;
+}
+
+static void gen_message_id(struct rev_info *info, char *base)
+{
+	struct strbuf buf = STRBUF_INIT;
+	strbuf_addf(&buf, "%s.%"PRItime".git.%s", base,
+		    (timestamp_t) time(NULL),
+		    git_committer_info(IDENT_NO_NAME|IDENT_NO_DATE|IDENT_STRICT));
+	info->message_id = strbuf_detach(&buf, NULL);
+}
+
+static void print_signature(FILE *file)
+{
+	if (!signature || !*signature)
+		return;
+
+	fprintf(file, "-- \n%s", signature);
+	if (signature[strlen(signature)-1] != '\n')
+		putc('\n', file);
+	putc('\n', file);
+}
+
+static char *find_branch_name(struct rev_info *rev)
+{
+	int i, positive = -1;
+	struct object_id branch_oid;
+	const struct object_id *tip_oid;
+	const char *ref, *v;
+	char *full_ref, *branch = NULL;
+
+	for (i = 0; i < rev->cmdline.nr; i++) {
+		if (rev->cmdline.rev[i].flags & UNINTERESTING)
+			continue;
+		if (positive < 0)
+			positive = i;
+		else
+			return NULL;
+	}
+	if (positive < 0)
+		return NULL;
+	ref = rev->cmdline.rev[positive].name;
+	tip_oid = &rev->cmdline.rev[positive].item->oid;
+	if (repo_dwim_ref(the_repository, ref, strlen(ref), &branch_oid,
+			  &full_ref, 0) &&
+	    skip_prefix(full_ref, "refs/heads/", &v) &&
+	    oideq(tip_oid, &branch_oid))
+		branch = xstrdup(v);
+	free(full_ref);
+	return branch;
+}
+
+static void show_diffstat(struct rev_info *rev,
+			  struct commit *origin, struct commit *head)
+{
+	struct diff_options opts;
+
+	memcpy(&opts, &rev->diffopt, sizeof(opts));
+	opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
+	diff_setup_done(&opts);
+
+	diff_tree_oid(get_commit_tree_oid(origin),
+		      get_commit_tree_oid(head),
+		      "", &opts);
+	diffcore_std(&opts);
+	diff_flush(&opts);
+
+	fprintf(rev->diffopt.file, "\n");
+}
+
+static void read_desc_file(struct strbuf *buf, const char *desc_file)
+{
+	if (strbuf_read_file(buf, desc_file, 0) < 0)
+		die_errno(_("unable to read branch description file '%s'"),
+			  desc_file);
+}
+
+static void prepare_cover_text(struct pretty_print_context *pp,
+			       const char *description_file,
+			       const char *branch_name,
+			       struct strbuf *sb,
+			       const char *encoding,
+			       int need_8bit_cte)
+{
+	const char *subject = "*** SUBJECT HERE ***";
+	const char *body = "*** BLURB HERE ***";
+	struct strbuf description_sb = STRBUF_INIT;
+	struct strbuf subject_sb = STRBUF_INIT;
+
+	if (cover_from_description_mode == COVER_FROM_NONE)
+		goto do_pp;
+
+	if (description_file && *description_file)
+		read_desc_file(&description_sb, description_file);
+	else if (branch_name && *branch_name)
+		read_branch_desc(&description_sb, branch_name);
+	if (!description_sb.len)
+		goto do_pp;
+
+	if (cover_from_description_mode == COVER_FROM_SUBJECT ||
+			cover_from_description_mode == COVER_FROM_AUTO)
+		body = format_subject(&subject_sb, description_sb.buf, " ");
+
+	if (cover_from_description_mode == COVER_FROM_MESSAGE ||
+			(cover_from_description_mode == COVER_FROM_AUTO &&
+			 subject_sb.len > COVER_FROM_AUTO_MAX_SUBJECT_LEN))
+		body = description_sb.buf;
+	else
+		subject = subject_sb.buf;
+
+do_pp:
+	pp_title_line(pp, &subject, sb, encoding, need_8bit_cte);
+	pp_remainder(pp, &body, sb, 0);
+
+	strbuf_release(&description_sb);
+	strbuf_release(&subject_sb);
+}
+
+static int get_notes_refs(struct string_list_item *item, void *arg)
+{
+	strvec_pushf(arg, "--notes=%s", item->string);
+	return 0;
+}
+
+static void get_notes_args(struct strvec *arg, struct rev_info *rev)
+{
+	if (!rev->show_notes) {
+		strvec_push(arg, "--no-notes");
+	} else if (rev->notes_opt.use_default_notes > 0 ||
+		   (rev->notes_opt.use_default_notes == -1 &&
+		    !rev->notes_opt.extra_notes_refs.nr)) {
+		strvec_push(arg, "--notes");
+	} else {
+		for_each_string_list(&rev->notes_opt.extra_notes_refs, get_notes_refs, arg);
+	}
+}
+
+static void make_cover_letter(struct rev_info *rev, int use_separate_file,
+			      struct commit *origin,
+			      int nr, struct commit **list,
+			      const char *description_file,
+			      const char *branch_name,
+			      int quiet)
+{
+	const char *committer;
+	struct shortlog log;
+	struct strbuf sb = STRBUF_INIT;
+	int i;
+	const char *encoding = "UTF-8";
+	int need_8bit_cte = 0;
+	struct pretty_print_context pp = {0};
+	struct commit *head = list[0];
+
+	if (!cmit_fmt_is_mail(rev->commit_format))
+		die(_("cover letter needs email format"));
+
+	committer = git_committer_info(0);
+
+	if (use_separate_file &&
+	    open_next_file(NULL, rev->numbered_files ? NULL : "cover-letter", rev, quiet))
+		die(_("failed to create cover-letter file"));
+
+	log_write_email_headers(rev, head, &pp.after_subject, &need_8bit_cte, 0);
+
+	for (i = 0; !need_8bit_cte && i < nr; i++) {
+		const char *buf = repo_get_commit_buffer(the_repository,
+							 list[i], NULL);
+		if (has_non_ascii(buf))
+			need_8bit_cte = 1;
+		repo_unuse_commit_buffer(the_repository, list[i], buf);
+	}
+
+	if (!branch_name)
+		branch_name = find_branch_name(rev);
+
+	pp.fmt = CMIT_FMT_EMAIL;
+	pp.date_mode.type = DATE_RFC2822;
+	pp.rev = rev;
+	pp.print_email_subject = 1;
+	pp_user_info(&pp, NULL, &sb, committer, encoding);
+	prepare_cover_text(&pp, description_file, branch_name, &sb,
+			   encoding, need_8bit_cte);
+	fprintf(rev->diffopt.file, "%s\n", sb.buf);
+
+	strbuf_release(&sb);
+
+	shortlog_init(&log);
+	log.wrap_lines = 1;
+	log.wrap = MAIL_DEFAULT_WRAP;
+	log.in1 = 2;
+	log.in2 = 4;
+	log.file = rev->diffopt.file;
+	log.groups = SHORTLOG_GROUP_AUTHOR;
+	shortlog_finish_setup(&log);
+	for (i = 0; i < nr; i++)
+		shortlog_add_commit(&log, list[i]);
+
+	shortlog_output(&log);
+
+	/* We can only do diffstat with a unique reference point */
+	if (origin)
+		show_diffstat(rev, origin, head);
+
+	if (rev->idiff_oid1) {
+		fprintf_ln(rev->diffopt.file, "%s", rev->idiff_title);
+		show_interdiff(rev->idiff_oid1, rev->idiff_oid2, 0,
+			       &rev->diffopt);
+	}
+
+	if (rev->rdiff1) {
+		/*
+		 * Pass minimum required diff-options to range-diff; others
+		 * can be added later if deemed desirable.
+		 */
+		struct diff_options opts;
+		struct strvec other_arg = STRVEC_INIT;
+		struct range_diff_options range_diff_opts = {
+			.creation_factor = rev->creation_factor,
+			.dual_color = 1,
+			.diffopt = &opts,
+			.other_arg = &other_arg
+		};
+
+		repo_diff_setup(the_repository, &opts);
+		opts.file = rev->diffopt.file;
+		opts.use_color = rev->diffopt.use_color;
+		diff_setup_done(&opts);
+		fprintf_ln(rev->diffopt.file, "%s", rev->rdiff_title);
+		get_notes_args(&other_arg, rev);
+		show_range_diff(rev->rdiff1, rev->rdiff2, &range_diff_opts);
+		strvec_clear(&other_arg);
+	}
+}
+
+static char *clean_message_id(const char *msg_id)
+{
+	char ch;
+	const char *a, *z, *m;
+
+	m = msg_id;
+	while ((ch = *m) && (isspace(ch) || (ch == '<')))
+		m++;
+	a = m;
+	z = NULL;
+	while ((ch = *m)) {
+		if (!isspace(ch) && (ch != '>'))
+			z = m;
+		m++;
+	}
+	if (!z)
+		die(_("insane in-reply-to: %s"), msg_id);
+	if (++z == m)
+		return xstrdup(a);
+	return xmemdupz(a, z - a);
+}
+
+static const char *set_outdir(const char *prefix, const char *output_directory)
+{
+	if (output_directory && is_absolute_path(output_directory))
+		return output_directory;
+
+	if (!prefix || !*prefix) {
+		if (output_directory)
+			return output_directory;
+		/* The user did not explicitly ask for "./" */
+		outdir_offset = 2;
+		return "./";
+	}
+
+	outdir_offset = strlen(prefix);
+	if (!output_directory)
+		return prefix;
+
+	return prefix_filename(prefix, output_directory);
+}
+
+static const char * const builtin_format_patch_usage[] = {
+	N_("git format-patch [<options>] [<since> | <revision-range>]"),
+	NULL
+};
+
+static int keep_subject = 0;
+
+static int keep_callback(const struct option *opt, const char *arg, int unset)
+{
+	BUG_ON_OPT_NEG(unset);
+	BUG_ON_OPT_ARG(arg);
+	((struct rev_info *)opt->value)->total = -1;
+	keep_subject = 1;
+	return 0;
+}
+
+static int subject_prefix = 0;
+
+static int subject_prefix_callback(const struct option *opt, const char *arg,
+			    int unset)
+{
+	struct strbuf *sprefix;
+
+	BUG_ON_OPT_NEG(unset);
+	sprefix = opt->value;
+	subject_prefix = 1;
+	strbuf_reset(sprefix);
+	strbuf_addstr(sprefix, arg);
+	return 0;
+}
+
+static int numbered_cmdline_opt = 0;
+
+static int numbered_callback(const struct option *opt, const char *arg,
+			     int unset)
+{
+	BUG_ON_OPT_ARG(arg);
+	*(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
+	if (unset)
+		auto_number =  0;
+	return 0;
+}
+
+static int no_numbered_callback(const struct option *opt, const char *arg,
+				int unset)
+{
+	BUG_ON_OPT_NEG(unset);
+	return numbered_callback(opt, arg, 1);
+}
+
+static int output_directory_callback(const struct option *opt, const char *arg,
+			      int unset)
+{
+	const char **dir = (const char **)opt->value;
+	BUG_ON_OPT_NEG(unset);
+	if (*dir)
+		die(_("two output directories?"));
+	*dir = arg;
+	return 0;
+}
+
+static int thread_callback(const struct option *opt, const char *arg, int unset)
+{
+	enum thread_level *thread = (enum thread_level *)opt->value;
+	if (unset)
+		*thread = THREAD_UNSET;
+	else if (!arg || !strcmp(arg, "shallow"))
+		*thread = THREAD_SHALLOW;
+	else if (!strcmp(arg, "deep"))
+		*thread = THREAD_DEEP;
+	/*
+	 * Please update _git_formatpatch() in git-completion.bash
+	 * when you add new options.
+	 */
+	else
+		return 1;
+	return 0;
+}
+
+static int attach_callback(const struct option *opt, const char *arg, int unset)
+{
+	struct rev_info *rev = (struct rev_info *)opt->value;
+	if (unset)
+		rev->mime_boundary = NULL;
+	else if (arg)
+		rev->mime_boundary = arg;
+	else
+		rev->mime_boundary = git_version_string;
+	rev->no_inline = unset ? 0 : 1;
+	return 0;
+}
+
+static int inline_callback(const struct option *opt, const char *arg, int unset)
+{
+	struct rev_info *rev = (struct rev_info *)opt->value;
+	if (unset)
+		rev->mime_boundary = NULL;
+	else if (arg)
+		rev->mime_boundary = arg;
+	else
+		rev->mime_boundary = git_version_string;
+	rev->no_inline = 0;
+	return 0;
+}
+
+static int header_callback(const struct option *opt UNUSED, const char *arg,
+			   int unset)
+{
+	if (unset) {
+		string_list_clear(&extra_hdr, 0);
+		string_list_clear(&extra_to, 0);
+		string_list_clear(&extra_cc, 0);
+	} else {
+		add_header(arg);
+	}
+	return 0;
+}
+
+static int from_callback(const struct option *opt, const char *arg, int unset)
+{
+	char **from = opt->value;
+
+	free(*from);
+
+	if (unset)
+		*from = NULL;
+	else if (arg)
+		*from = xstrdup(arg);
+	else
+		*from = xstrdup(git_committer_info(IDENT_NO_DATE));
+	return 0;
+}
+
+static int base_callback(const struct option *opt, const char *arg, int unset)
+{
+	const char **base_commit = opt->value;
+
+	if (unset) {
+		auto_base = AUTO_BASE_NEVER;
+		*base_commit = NULL;
+	} else if (!strcmp(arg, "auto")) {
+		auto_base = AUTO_BASE_ALWAYS;
+		*base_commit = NULL;
+	} else {
+		auto_base = AUTO_BASE_NEVER;
+		*base_commit = arg;
+	}
+	return 0;
+}
+
+struct base_tree_info {
+	struct object_id base_commit;
+	int nr_patch_id, alloc_patch_id;
+	struct object_id *patch_id;
+};
+
+static struct commit *get_base_commit(const char *base_commit,
+				      struct commit **list,
+				      int total)
+{
+	struct commit *base = NULL;
+	struct commit **rev;
+	int i = 0, rev_nr = 0, auto_select, die_on_failure;
+
+	switch (auto_base) {
+	case AUTO_BASE_NEVER:
+		if (base_commit) {
+			auto_select = 0;
+			die_on_failure = 1;
+		} else {
+			/* no base information is requested */
+			return NULL;
+		}
+		break;
+	case AUTO_BASE_ALWAYS:
+	case AUTO_BASE_WHEN_ABLE:
+		if (base_commit) {
+			BUG("requested automatic base selection but a commit was provided");
+		} else {
+			auto_select = 1;
+			die_on_failure = auto_base == AUTO_BASE_ALWAYS;
+		}
+		break;
+	default:
+		BUG("unexpected automatic base selection method");
+	}
+
+	if (!auto_select) {
+		base = lookup_commit_reference_by_name(base_commit);
+		if (!base)
+			die(_("unknown commit %s"), base_commit);
+	} else {
+		struct branch *curr_branch = branch_get(NULL);
+		const char *upstream = branch_get_upstream(curr_branch, NULL);
+		if (upstream) {
+			struct commit_list *base_list;
+			struct commit *commit;
+			struct object_id oid;
+
+			if (repo_get_oid(the_repository, upstream, &oid)) {
+				if (die_on_failure)
+					die(_("failed to resolve '%s' as a valid ref"), upstream);
+				else
+					return NULL;
+			}
+			commit = lookup_commit_or_die(&oid, "upstream base");
+			base_list = repo_get_merge_bases_many(the_repository,
+							      commit, total,
+							      list);
+			/* There should be one and only one merge base. */
+			if (!base_list || base_list->next) {
+				if (die_on_failure) {
+					die(_("could not find exact merge base"));
+				} else {
+					free_commit_list(base_list);
+					return NULL;
+				}
+			}
+			base = base_list->item;
+			free_commit_list(base_list);
+		} else {
+			if (die_on_failure)
+				die(_("failed to get upstream, if you want to record base commit automatically,\n"
+				      "please use git branch --set-upstream-to to track a remote branch.\n"
+				      "Or you could specify base commit by --base=<base-commit-id> manually"));
+			else
+				return NULL;
+		}
+	}
+
+	ALLOC_ARRAY(rev, total);
+	for (i = 0; i < total; i++)
+		rev[i] = list[i];
+
+	rev_nr = total;
+	/*
+	 * Get merge base through pair-wise computations
+	 * and store it in rev[0].
+	 */
+	while (rev_nr > 1) {
+		for (i = 0; i < rev_nr / 2; i++) {
+			struct commit_list *merge_base;
+			merge_base = repo_get_merge_bases(the_repository,
+							  rev[2 * i],
+							  rev[2 * i + 1]);
+			if (!merge_base || merge_base->next) {
+				if (die_on_failure) {
+					die(_("failed to find exact merge base"));
+				} else {
+					free(rev);
+					return NULL;
+				}
+			}
+
+			rev[i] = merge_base->item;
+		}
+
+		if (rev_nr % 2)
+			rev[i] = rev[2 * i];
+		rev_nr = DIV_ROUND_UP(rev_nr, 2);
+	}
+
+	if (!repo_in_merge_bases(the_repository, base, rev[0])) {
+		if (die_on_failure) {
+			die(_("base commit should be the ancestor of revision list"));
+		} else {
+			free(rev);
+			return NULL;
+		}
+	}
+
+	for (i = 0; i < total; i++) {
+		if (base == list[i]) {
+			if (die_on_failure) {
+				die(_("base commit shouldn't be in revision list"));
+			} else {
+				free(rev);
+				return NULL;
+			}
+		}
+	}
+
+	free(rev);
+	return base;
+}
+
+define_commit_slab(commit_base, int);
+
+static void prepare_bases(struct base_tree_info *bases,
+			  struct commit *base,
+			  struct commit **list,
+			  int total)
+{
+	struct commit *commit;
+	struct rev_info revs;
+	struct diff_options diffopt;
+	struct commit_base commit_base;
+	int i;
+
+	if (!base)
+		return;
+
+	init_commit_base(&commit_base);
+	repo_diff_setup(the_repository, &diffopt);
+	diffopt.flags.recursive = 1;
+	diff_setup_done(&diffopt);
+
+	oidcpy(&bases->base_commit, &base->object.oid);
+
+	repo_init_revisions(the_repository, &revs, NULL);
+	revs.max_parents = 1;
+	revs.topo_order = 1;
+	for (i = 0; i < total; i++) {
+		list[i]->object.flags &= ~UNINTERESTING;
+		add_pending_object(&revs, &list[i]->object, "rev_list");
+		*commit_base_at(&commit_base, list[i]) = 1;
+	}
+	base->object.flags |= UNINTERESTING;
+	add_pending_object(&revs, &base->object, "base");
+
+	if (prepare_revision_walk(&revs))
+		die(_("revision walk setup failed"));
+	/*
+	 * Traverse the commits list, get prerequisite patch ids
+	 * and stuff them in bases structure.
+	 */
+	while ((commit = get_revision(&revs)) != NULL) {
+		struct object_id oid;
+		struct object_id *patch_id;
+		if (*commit_base_at(&commit_base, commit))
+			continue;
+		if (commit_patch_id(commit, &diffopt, &oid, 0))
+			die(_("cannot get patch id"));
+		ALLOC_GROW(bases->patch_id, bases->nr_patch_id + 1, bases->alloc_patch_id);
+		patch_id = bases->patch_id + bases->nr_patch_id;
+		oidcpy(patch_id, &oid);
+		bases->nr_patch_id++;
+	}
+	clear_commit_base(&commit_base);
+}
+
+static void print_bases(struct base_tree_info *bases, FILE *file)
+{
+	int i;
+
+	/* Only do this once, either for the cover or for the first one */
+	if (is_null_oid(&bases->base_commit))
+		return;
+
+	/* Show the base commit */
+	fprintf(file, "\nbase-commit: %s\n", oid_to_hex(&bases->base_commit));
+
+	/* Show the prerequisite patches */
+	for (i = bases->nr_patch_id - 1; i >= 0; i--)
+		fprintf(file, "prerequisite-patch-id: %s\n", oid_to_hex(&bases->patch_id[i]));
+
+	free(bases->patch_id);
+	bases->nr_patch_id = 0;
+	bases->alloc_patch_id = 0;
+	oidclr(&bases->base_commit);
+}
+
+static const char *diff_title(struct strbuf *sb,
+			      const char *reroll_count,
+			      const char *generic,
+			      const char *rerolled)
+{
+	int v;
+
+	/* RFC may be v0, so allow -v1 to diff against v0 */
+	if (reroll_count && !strtol_i(reroll_count, 10, &v) &&
+	    v >= 1)
+		strbuf_addf(sb, rerolled, v - 1);
+	else
+		strbuf_addstr(sb, generic);
+	return sb->buf;
+}
+
+static void infer_range_diff_ranges(struct strbuf *r1,
+				    struct strbuf *r2,
+				    const char *prev,
+				    struct commit *origin,
+				    struct commit *head)
+{
+	const char *head_oid = oid_to_hex(&head->object.oid);
+	int prev_is_range = is_range_diff_range(prev);
+
+	if (prev_is_range)
+		strbuf_addstr(r1, prev);
+	else
+		strbuf_addf(r1, "%s..%s", head_oid, prev);
+
+	if (origin)
+		strbuf_addf(r2, "%s..%s", oid_to_hex(&origin->object.oid), head_oid);
+	else if (prev_is_range)
+		die(_("failed to infer range-diff origin of current series"));
+	else {
+		warning(_("using '%s' as range-diff origin of current series"), prev);
+		strbuf_addf(r2, "%s..%s", prev, head_oid);
+	}
+}
+
+int cmd_format_patch(int argc, const char **argv, const char *prefix)
+{
+	struct commit *commit;
+	struct commit **list = NULL;
+	struct rev_info rev;
+	char *to_free = NULL;
+	struct setup_revision_opt s_r_opt;
+	int nr = 0, total, i;
+	int use_stdout = 0;
+	int start_number = -1;
+	int just_numbers = 0;
+	int ignore_if_in_upstream = 0;
+	int cover_letter = -1;
+	int boundary_count = 0;
+	int no_binary_diff = 0;
+	int zero_commit = 0;
+	struct commit *origin = NULL;
+	const char *in_reply_to = NULL;
+	struct patch_ids ids;
+	struct strbuf buf = STRBUF_INIT;
+	int use_patch_format = 0;
+	int quiet = 0;
+	const char *reroll_count = NULL;
+	char *cover_from_description_arg = NULL;
+	char *description_file = NULL;
+	char *branch_name = NULL;
+	char *base_commit = NULL;
+	struct base_tree_info bases;
+	struct commit *base;
+	int show_progress = 0;
+	struct progress *progress = NULL;
+	struct oid_array idiff_prev = OID_ARRAY_INIT;
+	struct strbuf idiff_title = STRBUF_INIT;
+	const char *rdiff_prev = NULL;
+	struct strbuf rdiff1 = STRBUF_INIT;
+	struct strbuf rdiff2 = STRBUF_INIT;
+	struct strbuf rdiff_title = STRBUF_INIT;
+	struct strbuf sprefix = STRBUF_INIT;
+	int creation_factor = -1;
+	int rfc = 0;
+
+	const struct option builtin_format_patch_options[] = {
+		OPT_CALLBACK_F('n', "numbered", &numbered, NULL,
+			    N_("use [PATCH n/m] even with a single patch"),
+			    PARSE_OPT_NOARG, numbered_callback),
+		OPT_CALLBACK_F('N', "no-numbered", &numbered, NULL,
+			    N_("use [PATCH] even with multiple patches"),
+			    PARSE_OPT_NOARG | PARSE_OPT_NONEG, no_numbered_callback),
+		OPT_BOOL('s', "signoff", &do_signoff, N_("add a Signed-off-by trailer")),
+		OPT_BOOL(0, "stdout", &use_stdout,
+			    N_("print patches to standard out")),
+		OPT_BOOL(0, "cover-letter", &cover_letter,
+			    N_("generate a cover letter")),
+		OPT_BOOL(0, "numbered-files", &just_numbers,
+			    N_("use simple number sequence for output file names")),
+		OPT_STRING(0, "suffix", &fmt_patch_suffix, N_("sfx"),
+			    N_("use <sfx> instead of '.patch'")),
+		OPT_INTEGER(0, "start-number", &start_number,
+			    N_("start numbering patches at <n> instead of 1")),
+		OPT_STRING('v', "reroll-count", &reroll_count, N_("reroll-count"),
+			    N_("mark the series as Nth re-roll")),
+		OPT_INTEGER(0, "filename-max-length", &fmt_patch_name_max,
+			    N_("max length of output filename")),
+		OPT_BOOL(0, "rfc", &rfc, N_("use [RFC PATCH] instead of [PATCH]")),
+		OPT_STRING(0, "cover-from-description", &cover_from_description_arg,
+			    N_("cover-from-description-mode"),
+			    N_("generate parts of a cover letter based on a branch's description")),
+		OPT_FILENAME(0, "description-file", &description_file,
+			     N_("use branch description from file")),
+		OPT_CALLBACK_F(0, "subject-prefix", &sprefix, N_("prefix"),
+			    N_("use [<prefix>] instead of [PATCH]"),
+			    PARSE_OPT_NONEG, subject_prefix_callback),
+		OPT_CALLBACK_F('o', "output-directory", &output_directory,
+			    N_("dir"), N_("store resulting files in <dir>"),
+			    PARSE_OPT_NONEG, output_directory_callback),
+		OPT_CALLBACK_F('k', "keep-subject", &rev, NULL,
+			    N_("don't strip/add [PATCH]"),
+			    PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback),
+		OPT_BOOL(0, "no-binary", &no_binary_diff,
+			 N_("don't output binary diffs")),
+		OPT_BOOL(0, "zero-commit", &zero_commit,
+			 N_("output all-zero hash in From header")),
+		OPT_BOOL(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
+			 N_("don't include a patch matching a commit upstream")),
+		OPT_SET_INT_F('p', "no-stat", &use_patch_format,
+			      N_("show patch format instead of default (patch + stat)"),
+			      1, PARSE_OPT_NONEG),
+		OPT_GROUP(N_("Messaging")),
+		OPT_CALLBACK(0, "add-header", NULL, N_("header"),
+			    N_("add email header"), header_callback),
+		OPT_STRING_LIST(0, "to", &extra_to, N_("email"), N_("add To: header")),
+		OPT_STRING_LIST(0, "cc", &extra_cc, N_("email"), N_("add Cc: header")),
+		OPT_CALLBACK_F(0, "from", &from, N_("ident"),
+			    N_("set From address to <ident> (or committer ident if absent)"),
+			    PARSE_OPT_OPTARG, from_callback),
+		OPT_STRING(0, "in-reply-to", &in_reply_to, N_("message-id"),
+			    N_("make first mail a reply to <message-id>")),
+		OPT_CALLBACK_F(0, "attach", &rev, N_("boundary"),
+			    N_("attach the patch"), PARSE_OPT_OPTARG,
+			    attach_callback),
+		OPT_CALLBACK_F(0, "inline", &rev, N_("boundary"),
+			    N_("inline the patch"),
+			    PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
+			    inline_callback),
+		OPT_CALLBACK_F(0, "thread", &thread, N_("style"),
+			    N_("enable message threading, styles: shallow, deep"),
+			    PARSE_OPT_OPTARG, thread_callback),
+		OPT_STRING(0, "signature", &signature, N_("signature"),
+			    N_("add a signature")),
+		OPT_CALLBACK_F(0, "base", &base_commit, N_("base-commit"),
+			       N_("add prerequisite tree info to the patch series"),
+			       0, base_callback),
+		OPT_FILENAME(0, "signature-file", &signature_file,
+				N_("add a signature from a file")),
+		OPT__QUIET(&quiet, N_("don't print the patch filenames")),
+		OPT_BOOL(0, "progress", &show_progress,
+			 N_("show progress while generating patches")),
+		OPT_CALLBACK(0, "interdiff", &idiff_prev, N_("rev"),
+			     N_("show changes against <rev> in cover letter or single patch"),
+			     parse_opt_object_name),
+		OPT_STRING(0, "range-diff", &rdiff_prev, N_("refspec"),
+			   N_("show changes against <refspec> in cover letter or single patch")),
+		OPT_INTEGER(0, "creation-factor", &creation_factor,
+			    N_("percentage by which creation is weighted")),
+		OPT_BOOL(0, "force-in-body-from", &force_in_body_from,
+			 N_("show in-body From: even if identical to the e-mail header")),
+		OPT_END()
+	};
+
+	extra_hdr.strdup_strings = 1;
+	extra_to.strdup_strings = 1;
+	extra_cc.strdup_strings = 1;
+
+	init_log_defaults();
+	init_display_notes(&notes_opt);
+	git_config(git_format_config, NULL);
+	repo_init_revisions(the_repository, &rev, prefix);
+	git_config(grep_config, &rev.grep_filter);
+
+	rev.show_notes = show_notes;
+	memcpy(&rev.notes_opt, &notes_opt, sizeof(notes_opt));
+	rev.commit_format = CMIT_FMT_EMAIL;
+	rev.encode_email_headers = default_encode_email_headers;
+	rev.expand_tabs_in_log_default = 0;
+	rev.verbose_header = 1;
+	rev.diff = 1;
+	rev.max_parents = 1;
+	rev.diffopt.flags.recursive = 1;
+	rev.diffopt.no_free = 1;
+	memset(&s_r_opt, 0, sizeof(s_r_opt));
+	s_r_opt.def = "HEAD";
+	s_r_opt.revarg_opt = REVARG_COMMITTISH;
+
+	strbuf_addstr(&sprefix, fmt_patch_subject_prefix);
+	if (format_no_prefix)
+		diff_set_noprefix(&rev.diffopt);
+
+	if (default_attach) {
+		rev.mime_boundary = default_attach;
+		rev.no_inline = 1;
+	}
+
+	/*
+	 * Parse the arguments before setup_revisions(), or something
+	 * like "git format-patch -o a123 HEAD^.." may fail; a123 is
+	 * possibly a valid SHA1.
+	 */
+	argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
+			     builtin_format_patch_usage,
+			     PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN_OPT |
+			     PARSE_OPT_KEEP_DASHDASH);
+
+	rev.force_in_body_from = force_in_body_from;
+
+	/* Make sure "0000-$sub.patch" gives non-negative length for $sub */
+	if (fmt_patch_name_max <= strlen("0000-") + strlen(fmt_patch_suffix))
+		fmt_patch_name_max = strlen("0000-") + strlen(fmt_patch_suffix);
+
+	if (cover_from_description_arg)
+		cover_from_description_mode = parse_cover_from_description(cover_from_description_arg);
+
+	if (rfc)
+		strbuf_insertstr(&sprefix, 0, "RFC ");
+
+	if (reroll_count) {
+		strbuf_addf(&sprefix, " v%s", reroll_count);
+		rev.reroll_count = reroll_count;
+	}
+
+	rev.subject_prefix = sprefix.buf;
+
+	for (i = 0; i < extra_hdr.nr; i++) {
+		strbuf_addstr(&buf, extra_hdr.items[i].string);
+		strbuf_addch(&buf, '\n');
+	}
+
+	if (extra_to.nr)
+		strbuf_addstr(&buf, "To: ");
+	for (i = 0; i < extra_to.nr; i++) {
+		if (i)
+			strbuf_addstr(&buf, "    ");
+		strbuf_addstr(&buf, extra_to.items[i].string);
+		if (i + 1 < extra_to.nr)
+			strbuf_addch(&buf, ',');
+		strbuf_addch(&buf, '\n');
+	}
+
+	if (extra_cc.nr)
+		strbuf_addstr(&buf, "Cc: ");
+	for (i = 0; i < extra_cc.nr; i++) {
+		if (i)
+			strbuf_addstr(&buf, "    ");
+		strbuf_addstr(&buf, extra_cc.items[i].string);
+		if (i + 1 < extra_cc.nr)
+			strbuf_addch(&buf, ',');
+		strbuf_addch(&buf, '\n');
+	}
+
+	rev.extra_headers = to_free = strbuf_detach(&buf, NULL);
+
+	if (from) {
+		if (split_ident_line(&rev.from_ident, from, strlen(from)))
+			die(_("invalid ident line: %s"), from);
+	}
+
+	if (start_number < 0)
+		start_number = 1;
+
+	/*
+	 * If numbered is set solely due to format.numbered in config,
+	 * and it would conflict with --keep-subject (-k) from the
+	 * command line, reset "numbered".
+	 */
+	if (numbered && keep_subject && !numbered_cmdline_opt)
+		numbered = 0;
+
+	if (numbered && keep_subject)
+		die(_("options '%s' and '%s' cannot be used together"), "-n", "-k");
+	if (keep_subject && subject_prefix)
+		die(_("options '%s' and '%s' cannot be used together"), "--subject-prefix/--rfc", "-k");
+	rev.preserve_subject = keep_subject;
+
+	argc = setup_revisions(argc, argv, &rev, &s_r_opt);
+	if (argc > 1)
+		die(_("unrecognized argument: %s"), argv[1]);
+
+	if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
+		die(_("--name-only does not make sense"));
+	if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
+		die(_("--name-status does not make sense"));
+	if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
+		die(_("--check does not make sense"));
+	if (rev.remerge_diff)
+		die(_("--remerge-diff does not make sense"));
+
+	if (!use_patch_format &&
+		(!rev.diffopt.output_format ||
+		 rev.diffopt.output_format == DIFF_FORMAT_PATCH))
+		rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
+	if (!rev.diffopt.stat_width)
+		rev.diffopt.stat_width = MAIL_DEFAULT_WRAP;
+
+	/* Always generate a patch */
+	rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
+	rev.always_show_header = 1;
+
+	rev.zero_commit = zero_commit;
+	rev.patch_name_max = fmt_patch_name_max;
+
+	if (!rev.diffopt.flags.text && !no_binary_diff)
+		rev.diffopt.flags.binary = 1;
+
+	if (rev.show_notes)
+		load_display_notes(&rev.notes_opt);
+
+	die_for_incompatible_opt3(use_stdout, "--stdout",
+				  rev.diffopt.close_file, "--output",
+				  !!output_directory, "--output-directory");
+
+	if (use_stdout && stdout_mboxrd)
+		rev.commit_format = CMIT_FMT_MBOXRD;
+
+	if (use_stdout) {
+		setup_pager();
+	} else if (!rev.diffopt.close_file) {
+		int saved;
+
+		if (!output_directory)
+			output_directory = config_output_directory;
+		output_directory = set_outdir(prefix, output_directory);
+
+		if (rev.diffopt.use_color != GIT_COLOR_ALWAYS)
+			rev.diffopt.use_color = GIT_COLOR_NEVER;
+		/*
+		 * We consider <outdir> as 'outside of gitdir', therefore avoid
+		 * applying adjust_shared_perm in s-c-l-d.
+		 */
+		saved = get_shared_repository();
+		set_shared_repository(0);
+		switch (safe_create_leading_directories_const(output_directory)) {
+		case SCLD_OK:
+		case SCLD_EXISTS:
+			break;
+		default:
+			die(_("could not create leading directories "
+			      "of '%s'"), output_directory);
+		}
+		set_shared_repository(saved);
+		if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
+			die_errno(_("could not create directory '%s'"),
+				  output_directory);
+	}
+
+	if (rev.pending.nr == 1) {
+		int check_head = 0;
+
+		if (rev.max_count < 0 && !rev.show_root_diff) {
+			/*
+			 * This is traditional behaviour of "git format-patch
+			 * origin" that prepares what the origin side still
+			 * does not have.
+			 */
+			rev.pending.objects[0].item->flags |= UNINTERESTING;
+			add_head_to_pending(&rev);
+			check_head = 1;
+		}
+		/*
+		 * Otherwise, it is "format-patch -22 HEAD", and/or
+		 * "format-patch --root HEAD".  The user wants
+		 * get_revision() to do the usual traversal.
+		 */
+
+		if (!strcmp(rev.pending.objects[0].name, "HEAD"))
+			check_head = 1;
+
+		if (check_head) {
+			const char *ref, *v;
+			ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
+						 NULL, NULL);
+			if (ref && skip_prefix(ref, "refs/heads/", &v))
+				branch_name = xstrdup(v);
+			else
+				branch_name = xstrdup(""); /* no branch */
+		}
+	}
+
+	/*
+	 * We cannot move this anywhere earlier because we do want to
+	 * know if --root was given explicitly from the command line.
+	 */
+	rev.show_root_diff = 1;
+
+	if (ignore_if_in_upstream) {
+		/* Don't say anything if head and upstream are the same. */
+		if (rev.pending.nr == 2) {
+			struct object_array_entry *o = rev.pending.objects;
+			if (oideq(&o[0].item->oid, &o[1].item->oid))
+				goto done;
+		}
+		get_patch_ids(&rev, &ids);
+	}
+
+	if (prepare_revision_walk(&rev))
+		die(_("revision walk setup failed"));
+	rev.boundary = 1;
+	while ((commit = get_revision(&rev)) != NULL) {
+		if (commit->object.flags & BOUNDARY) {
+			boundary_count++;
+			origin = (boundary_count == 1) ? commit : NULL;
+			continue;
+		}
+
+		if (ignore_if_in_upstream && has_commit_patch_id(commit, &ids))
+			continue;
+
+		nr++;
+		REALLOC_ARRAY(list, nr);
+		list[nr - 1] = commit;
+	}
+	if (nr == 0)
+		/* nothing to do */
+		goto done;
+	total = nr;
+	if (cover_letter == -1) {
+		if (config_cover_letter == COVER_AUTO)
+			cover_letter = (total > 1);
+		else
+			cover_letter = (config_cover_letter == COVER_ON);
+	}
+	if (!keep_subject && auto_number && (total > 1 || cover_letter))
+		numbered = 1;
+	if (numbered)
+		rev.total = total + start_number - 1;
+
+	if (idiff_prev.nr) {
+		if (!cover_letter && total != 1)
+			die(_("--interdiff requires --cover-letter or single patch"));
+		rev.idiff_oid1 = &idiff_prev.oid[idiff_prev.nr - 1];
+		rev.idiff_oid2 = get_commit_tree_oid(list[0]);
+		rev.idiff_title = diff_title(&idiff_title, reroll_count,
+					     _("Interdiff:"),
+					     _("Interdiff against v%d:"));
+	}
+
+	if (creation_factor < 0)
+		creation_factor = RANGE_DIFF_CREATION_FACTOR_DEFAULT;
+	else if (!rdiff_prev)
+		die(_("the option '%s' requires '%s'"), "--creation-factor", "--range-diff");
+
+	if (rdiff_prev) {
+		if (!cover_letter && total != 1)
+			die(_("--range-diff requires --cover-letter or single patch"));
+
+		infer_range_diff_ranges(&rdiff1, &rdiff2, rdiff_prev,
+					origin, list[0]);
+		rev.rdiff1 = rdiff1.buf;
+		rev.rdiff2 = rdiff2.buf;
+		rev.creation_factor = creation_factor;
+		rev.rdiff_title = diff_title(&rdiff_title, reroll_count,
+					     _("Range-diff:"),
+					     _("Range-diff against v%d:"));
+	}
+
+	if (!signature) {
+		; /* --no-signature inhibits all signatures */
+	} else if (signature && signature != git_version_string) {
+		; /* non-default signature already set */
+	} else if (signature_file) {
+		struct strbuf buf = STRBUF_INIT;
+
+		if (strbuf_read_file(&buf, signature_file, 128) < 0)
+			die_errno(_("unable to read signature file '%s'"), signature_file);
+		signature = strbuf_detach(&buf, NULL);
+	}
+
+	memset(&bases, 0, sizeof(bases));
+	base = get_base_commit(base_commit, list, nr);
+	if (base) {
+		reset_revision_walk();
+		clear_object_flags(UNINTERESTING);
+		prepare_bases(&bases, base, list, nr);
+	}
+
+	if (in_reply_to || thread || cover_letter) {
+		rev.ref_message_ids = xmalloc(sizeof(*rev.ref_message_ids));
+		string_list_init_dup(rev.ref_message_ids);
+	}
+	if (in_reply_to) {
+		char *msgid = clean_message_id(in_reply_to);
+		string_list_append_nodup(rev.ref_message_ids, msgid);
+	}
+	rev.numbered_files = just_numbers;
+	rev.patch_suffix = fmt_patch_suffix;
+	if (cover_letter) {
+		if (thread)
+			gen_message_id(&rev, "cover");
+		make_cover_letter(&rev, !!output_directory,
+				  origin, nr, list, description_file, branch_name, quiet);
+		print_bases(&bases, rev.diffopt.file);
+		print_signature(rev.diffopt.file);
+		total++;
+		start_number--;
+		/* interdiff/range-diff in cover-letter; omit from patches */
+		rev.idiff_oid1 = NULL;
+		rev.rdiff1 = NULL;
+	}
+	rev.add_signoff = do_signoff;
+
+	if (show_progress)
+		progress = start_delayed_progress(_("Generating patches"), total);
+	while (0 <= --nr) {
+		int shown;
+		display_progress(progress, total - nr);
+		commit = list[nr];
+		rev.nr = total - nr + (start_number - 1);
+		/* Make the second and subsequent mails replies to the first */
+		if (thread) {
+			/* Have we already had a message ID? */
+			if (rev.message_id) {
+				/*
+				 * For deep threading: make every mail
+				 * a reply to the previous one, no
+				 * matter what other options are set.
+				 *
+				 * For shallow threading:
+				 *
+				 * Without --cover-letter and
+				 * --in-reply-to, make every mail a
+				 * reply to the one before.
+				 *
+				 * With --in-reply-to but no
+				 * --cover-letter, make every mail a
+				 * reply to the <reply-to>.
+				 *
+				 * With --cover-letter, make every
+				 * mail but the cover letter a reply
+				 * to the cover letter.  The cover
+				 * letter is a reply to the
+				 * --in-reply-to, if specified.
+				 */
+				if (thread == THREAD_SHALLOW
+				    && rev.ref_message_ids->nr > 0
+				    && (!cover_letter || rev.nr > 1))
+					free(rev.message_id);
+				else
+					string_list_append_nodup(rev.ref_message_ids,
+								 rev.message_id);
+			}
+			gen_message_id(&rev, oid_to_hex(&commit->object.oid));
+		}
+
+		if (output_directory &&
+		    open_next_file(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
+			die(_("failed to create output files"));
+		shown = log_tree_commit(&rev, commit);
+		free_commit_buffer(the_repository->parsed_objects,
+				   commit);
+
+		/* We put one extra blank line between formatted
+		 * patches and this flag is used by log-tree code
+		 * to see if it needs to emit a LF before showing
+		 * the log; when using one file per patch, we do
+		 * not want the extra blank line.
+		 */
+		if (output_directory)
+			rev.shown_one = 0;
+		if (shown) {
+			print_bases(&bases, rev.diffopt.file);
+			if (rev.mime_boundary)
+				fprintf(rev.diffopt.file, "\n--%s%s--\n\n\n",
+				       mime_boundary_leader,
+				       rev.mime_boundary);
+			else
+				print_signature(rev.diffopt.file);
+		}
+		if (output_directory)
+			fclose(rev.diffopt.file);
+	}
+	stop_progress(&progress);
+	free(list);
+	free(branch_name);
+	string_list_clear(&extra_to, 0);
+	string_list_clear(&extra_cc, 0);
+	string_list_clear(&extra_hdr, 0);
+	if (ignore_if_in_upstream)
+		free_patch_ids(&ids);
+
+done:
+	oid_array_clear(&idiff_prev);
+	strbuf_release(&idiff_title);
+	strbuf_release(&rdiff1);
+	strbuf_release(&rdiff2);
+	strbuf_release(&rdiff_title);
+	strbuf_release(&sprefix);
+	free(to_free);
+	free(rev.message_id);
+	if (rev.ref_message_ids)
+		string_list_clear(rev.ref_message_ids, 0);
+	free(rev.ref_message_ids);
+	return cmd_log_deinit(0, &rev);
+}
+
+static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
+{
+	struct object_id oid;
+	if (repo_get_oid(the_repository, arg, &oid) == 0) {
+		struct commit *commit = lookup_commit_reference(the_repository,
+								&oid);
+		if (commit) {
+			commit->object.flags |= flags;
+			add_pending_object(revs, &commit->object, arg);
+			return 0;
+		}
+	}
+	return -1;
+}
+
+static const char * const cherry_usage[] = {
+	N_("git cherry [-v] [<upstream> [<head> [<limit>]]]"),
+	NULL
+};
+
+static void print_commit(char sign, struct commit *commit, int verbose,
+			 int abbrev, FILE *file)
+{
+	if (!verbose) {
+		fprintf(file, "%c %s\n", sign,
+		       repo_find_unique_abbrev(the_repository, &commit->object.oid, abbrev));
+	} else {
+		struct strbuf buf = STRBUF_INIT;
+		pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
+		fprintf(file, "%c %s %s\n", sign,
+		       repo_find_unique_abbrev(the_repository, &commit->object.oid, abbrev),
+		       buf.buf);
+		strbuf_release(&buf);
+	}
+}
+
+int cmd_cherry(int argc, const char **argv, const char *prefix)
+{
+	struct rev_info revs;
+	struct patch_ids ids;
+	struct commit *commit;
+	struct commit_list *list = NULL;
+	struct branch *current_branch;
+	const char *upstream;
+	const char *head = "HEAD";
+	const char *limit = NULL;
+	int verbose = 0, abbrev = 0;
+
+	struct option options[] = {
+		OPT__ABBREV(&abbrev),
+		OPT__VERBOSE(&verbose, N_("be verbose")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options, cherry_usage, 0);
+
+	switch (argc) {
+	case 3:
+		limit = argv[2];
+		/* FALLTHROUGH */
+	case 2:
+		head = argv[1];
+		/* FALLTHROUGH */
+	case 1:
+		upstream = argv[0];
+		break;
+	default:
+		current_branch = branch_get(NULL);
+		upstream = branch_get_upstream(current_branch, NULL);
+		if (!upstream) {
+			fprintf(stderr, _("Could not find a tracked"
+					" remote branch, please"
+					" specify <upstream> manually.\n"));
+			usage_with_options(cherry_usage, options);
+		}
+	}
+
+	repo_init_revisions(the_repository, &revs, prefix);
+	revs.max_parents = 1;
+
+	if (add_pending_commit(head, &revs, 0))
+		die(_("unknown commit %s"), head);
+	if (add_pending_commit(upstream, &revs, UNINTERESTING))
+		die(_("unknown commit %s"), upstream);
+
+	/* Don't say anything if head and upstream are the same. */
+	if (revs.pending.nr == 2) {
+		struct object_array_entry *o = revs.pending.objects;
+		if (oideq(&o[0].item->oid, &o[1].item->oid))
+			return 0;
+	}
+
+	get_patch_ids(&revs, &ids);
+
+	if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
+		die(_("unknown commit %s"), limit);
+
+	/* reverse the list of commits */
+	if (prepare_revision_walk(&revs))
+		die(_("revision walk setup failed"));
+	while ((commit = get_revision(&revs)) != NULL) {
+		commit_list_insert(commit, &list);
+	}
+
+	while (list) {
+		char sign = '+';
+
+		commit = list->item;
+		if (has_commit_patch_id(commit, &ids))
+			sign = '-';
+		print_commit(sign, commit, verbose, abbrev, revs.diffopt.file);
+		list = list->next;
+	}
+
+	free_patch_ids(&ids);
+	return 0;
+}