Move 'builtin-*' into a 'builtin/' subdirectory

This shrinks the top-level directory a bit, and makes it much more
pleasant to use auto-completion on the thing. Instead of

	[torvalds@nehalem git]$ em buil<tab>
	Display all 180 possibilities? (y or n)
	[torvalds@nehalem git]$ em builtin-sh
	builtin-shortlog.c     builtin-show-branch.c  builtin-show-ref.c
	builtin-shortlog.o     builtin-show-branch.o  builtin-show-ref.o
	[torvalds@nehalem git]$ em builtin-shor<tab>
	builtin-shortlog.c  builtin-shortlog.o
	[torvalds@nehalem git]$ em builtin-shortlog.c

you get

	[torvalds@nehalem git]$ em buil<tab>		[type]
	builtin/   builtin.h
	[torvalds@nehalem git]$ em builtin		[auto-completes to]
	[torvalds@nehalem git]$ em builtin/sh<tab>	[type]
	shortlog.c     shortlog.o     show-branch.c  show-branch.o  show-ref.c     show-ref.o
	[torvalds@nehalem git]$ em builtin/sho		[auto-completes to]
	[torvalds@nehalem git]$ em builtin/shor<tab>	[type]
	shortlog.c  shortlog.o
	[torvalds@nehalem git]$ em builtin/shortlog.c

which doesn't seem all that different, but not having that annoying
break in "Display all 180 possibilities?" is quite a relief.

NOTE! If you do this in a clean tree (no object files etc), or using an
editor that has auto-completion rules that ignores '*.o' files, you
won't see that annoying 'Display all 180 possibilities?' message - it
will just show the choices instead.  I think bash has some cut-off
around 100 choices or something.

So the reason I see this is that I'm using an odd editory, and thus
don't have the rules to cut down on auto-completion.  But you can
simulate that by using 'ls' instead, or something similar.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 0 insertions, 1292 deletions

diff --git a/builtin-merge.c b/builtin-merge.c
deleted file mode 100644
index 3aaec7bed7..0000000000
--- a/builtin-merge.c
+++ /dev/null
@@ -1,1292 +0,0 @@
-/*
- * Builtin "git merge"
- *
- * Copyright (c) 2008 Miklos Vajna <vmiklos@frugalware.org>
- *
- * Based on git-merge.sh by Junio C Hamano.
- */
-
-#include "cache.h"
-#include "parse-options.h"
-#include "builtin.h"
-#include "run-command.h"
-#include "diff.h"
-#include "refs.h"
-#include "commit.h"
-#include "diffcore.h"
-#include "revision.h"
-#include "unpack-trees.h"
-#include "cache-tree.h"
-#include "dir.h"
-#include "utf8.h"
-#include "log-tree.h"
-#include "color.h"
-#include "rerere.h"
-#include "help.h"
-#include "merge-recursive.h"
-#include "resolve-undo.h"
-
-#define DEFAULT_TWOHEAD (1<<0)
-#define DEFAULT_OCTOPUS (1<<1)
-#define NO_FAST_FORWARD (1<<2)
-#define NO_TRIVIAL      (1<<3)
-
-struct strategy {
-	const char *name;
-	unsigned attr;
-};
-
-static const char * const builtin_merge_usage[] = {
-	"git merge [options] <remote>...",
-	"git merge [options] <msg> HEAD <remote>",
-	NULL
-};
-
-static int show_diffstat = 1, option_log, squash;
-static int option_commit = 1, allow_fast_forward = 1;
-static int fast_forward_only;
-static int allow_trivial = 1, have_message;
-static struct strbuf merge_msg;
-static struct commit_list *remoteheads;
-static unsigned char head[20], stash[20];
-static struct strategy **use_strategies;
-static size_t use_strategies_nr, use_strategies_alloc;
-static const char **xopts;
-static size_t xopts_nr, xopts_alloc;
-static const char *branch;
-static int verbosity;
-static int allow_rerere_auto;
-
-static struct strategy all_strategy[] = {
-	{ "recursive",  DEFAULT_TWOHEAD | NO_TRIVIAL },
-	{ "octopus",    DEFAULT_OCTOPUS },
-	{ "resolve",    0 },
-	{ "ours",       NO_FAST_FORWARD | NO_TRIVIAL },
-	{ "subtree",    NO_FAST_FORWARD | NO_TRIVIAL },
-};
-
-static const char *pull_twohead, *pull_octopus;
-
-static int option_parse_message(const struct option *opt,
-				const char *arg, int unset)
-{
-	struct strbuf *buf = opt->value;
-
-	if (unset)
-		strbuf_setlen(buf, 0);
-	else if (arg) {
-		strbuf_addf(buf, "%s%s", buf->len ? "\n\n" : "", arg);
-		have_message = 1;
-	} else
-		return error("switch `m' requires a value");
-	return 0;
-}
-
-static struct strategy *get_strategy(const char *name)
-{
-	int i;
-	struct strategy *ret;
-	static struct cmdnames main_cmds, other_cmds;
-	static int loaded;
-
-	if (!name)
-		return NULL;
-
-	for (i = 0; i < ARRAY_SIZE(all_strategy); i++)
-		if (!strcmp(name, all_strategy[i].name))
-			return &all_strategy[i];
-
-	if (!loaded) {
-		struct cmdnames not_strategies;
-		loaded = 1;
-
-		memset(&not_strategies, 0, sizeof(struct cmdnames));
-		load_command_list("git-merge-", &main_cmds, &other_cmds);
-		for (i = 0; i < main_cmds.cnt; i++) {
-			int j, found = 0;
-			struct cmdname *ent = main_cmds.names[i];
-			for (j = 0; j < ARRAY_SIZE(all_strategy); j++)
-				if (!strncmp(ent->name, all_strategy[j].name, ent->len)
-						&& !all_strategy[j].name[ent->len])
-					found = 1;
-			if (!found)
-				add_cmdname(&not_strategies, ent->name, ent->len);
-		}
-		exclude_cmds(&main_cmds, &not_strategies);
-	}
-	if (!is_in_cmdlist(&main_cmds, name) && !is_in_cmdlist(&other_cmds, name)) {
-		fprintf(stderr, "Could not find merge strategy '%s'.\n", name);
-		fprintf(stderr, "Available strategies are:");
-		for (i = 0; i < main_cmds.cnt; i++)
-			fprintf(stderr, " %s", main_cmds.names[i]->name);
-		fprintf(stderr, ".\n");
-		if (other_cmds.cnt) {
-			fprintf(stderr, "Available custom strategies are:");
-			for (i = 0; i < other_cmds.cnt; i++)
-				fprintf(stderr, " %s", other_cmds.names[i]->name);
-			fprintf(stderr, ".\n");
-		}
-		exit(1);
-	}
-
-	ret = xcalloc(1, sizeof(struct strategy));
-	ret->name = xstrdup(name);
-	return ret;
-}
-
-static void append_strategy(struct strategy *s)
-{
-	ALLOC_GROW(use_strategies, use_strategies_nr + 1, use_strategies_alloc);
-	use_strategies[use_strategies_nr++] = s;
-}
-
-static int option_parse_strategy(const struct option *opt,
-				 const char *name, int unset)
-{
-	if (unset)
-		return 0;
-
-	append_strategy(get_strategy(name));
-	return 0;
-}
-
-static int option_parse_x(const struct option *opt,
-			  const char *arg, int unset)
-{
-	if (unset)
-		return 0;
-
-	ALLOC_GROW(xopts, xopts_nr + 1, xopts_alloc);
-	xopts[xopts_nr++] = xstrdup(arg);
-	return 0;
-}
-
-static int option_parse_n(const struct option *opt,
-			  const char *arg, int unset)
-{
-	show_diffstat = unset;
-	return 0;
-}
-
-static struct option builtin_merge_options[] = {
-	{ OPTION_CALLBACK, 'n', NULL, NULL, NULL,
-		"do not show a diffstat at the end of the merge",
-		PARSE_OPT_NOARG, option_parse_n },
-	OPT_BOOLEAN(0, "stat", &show_diffstat,
-		"show a diffstat at the end of the merge"),
-	OPT_BOOLEAN(0, "summary", &show_diffstat, "(synonym to --stat)"),
-	OPT_BOOLEAN(0, "log", &option_log,
-		"add list of one-line log to merge commit message"),
-	OPT_BOOLEAN(0, "squash", &squash,
-		"create a single commit instead of doing a merge"),
-	OPT_BOOLEAN(0, "commit", &option_commit,
-		"perform a commit if the merge succeeds (default)"),
-	OPT_BOOLEAN(0, "ff", &allow_fast_forward,
-		"allow fast-forward (default)"),
-	OPT_BOOLEAN(0, "ff-only", &fast_forward_only,
-		"abort if fast-forward is not possible"),
-	OPT_RERERE_AUTOUPDATE(&allow_rerere_auto),
-	OPT_CALLBACK('s', "strategy", &use_strategies, "strategy",
-		"merge strategy to use", option_parse_strategy),
-	OPT_CALLBACK('X', "strategy-option", &xopts, "option=value",
-		"option for selected merge strategy", option_parse_x),
-	OPT_CALLBACK('m', "message", &merge_msg, "message",
-		"message to be used for the merge commit (if any)",
-		option_parse_message),
-	OPT__VERBOSITY(&verbosity),
-	OPT_END()
-};
-
-/* Cleans up metadata that is uninteresting after a succeeded merge. */
-static void drop_save(void)
-{
-	unlink(git_path("MERGE_HEAD"));
-	unlink(git_path("MERGE_MSG"));
-	unlink(git_path("MERGE_MODE"));
-}
-
-static void save_state(void)
-{
-	int len;
-	struct child_process cp;
-	struct strbuf buffer = STRBUF_INIT;
-	const char *argv[] = {"stash", "create", NULL};
-
-	memset(&cp, 0, sizeof(cp));
-	cp.argv = argv;
-	cp.out = -1;
-	cp.git_cmd = 1;
-
-	if (start_command(&cp))
-		die("could not run stash.");
-	len = strbuf_read(&buffer, cp.out, 1024);
-	close(cp.out);
-
-	if (finish_command(&cp) || len < 0)
-		die("stash failed");
-	else if (!len)
-		return;
-	strbuf_setlen(&buffer, buffer.len-1);
-	if (get_sha1(buffer.buf, stash))
-		die("not a valid object: %s", buffer.buf);
-}
-
-static void reset_hard(unsigned const char *sha1, int verbose)
-{
-	int i = 0;
-	const char *args[6];
-
-	args[i++] = "read-tree";
-	if (verbose)
-		args[i++] = "-v";
-	args[i++] = "--reset";
-	args[i++] = "-u";
-	args[i++] = sha1_to_hex(sha1);
-	args[i] = NULL;
-
-	if (run_command_v_opt(args, RUN_GIT_CMD))
-		die("read-tree failed");
-}
-
-static void restore_state(void)
-{
-	struct strbuf sb = STRBUF_INIT;
-	const char *args[] = { "stash", "apply", NULL, NULL };
-
-	if (is_null_sha1(stash))
-		return;
-
-	reset_hard(head, 1);
-
-	args[2] = sha1_to_hex(stash);
-
-	/*
-	 * It is OK to ignore error here, for example when there was
-	 * nothing to restore.
-	 */
-	run_command_v_opt(args, RUN_GIT_CMD);
-
-	strbuf_release(&sb);
-	refresh_cache(REFRESH_QUIET);
-}
-
-/* This is called when no merge was necessary. */
-static void finish_up_to_date(const char *msg)
-{
-	if (verbosity >= 0)
-		printf("%s%s\n", squash ? " (nothing to squash)" : "", msg);
-	drop_save();
-}
-
-static void squash_message(void)
-{
-	struct rev_info rev;
-	struct commit *commit;
-	struct strbuf out = STRBUF_INIT;
-	struct commit_list *j;
-	int fd;
-	struct pretty_print_context ctx = {0};
-
-	printf("Squash commit -- not updating HEAD\n");
-	fd = open(git_path("SQUASH_MSG"), O_WRONLY | O_CREAT, 0666);
-	if (fd < 0)
-		die_errno("Could not write to '%s'", git_path("SQUASH_MSG"));
-
-	init_revisions(&rev, NULL);
-	rev.ignore_merges = 1;
-	rev.commit_format = CMIT_FMT_MEDIUM;
-
-	commit = lookup_commit(head);
-	commit->object.flags |= UNINTERESTING;
-	add_pending_object(&rev, &commit->object, NULL);
-
-	for (j = remoteheads; j; j = j->next)
-		add_pending_object(&rev, &j->item->object, NULL);
-
-	setup_revisions(0, NULL, &rev, NULL);
-	if (prepare_revision_walk(&rev))
-		die("revision walk setup failed");
-
-	ctx.abbrev = rev.abbrev;
-	ctx.date_mode = rev.date_mode;
-
-	strbuf_addstr(&out, "Squashed commit of the following:\n");
-	while ((commit = get_revision(&rev)) != NULL) {
-		strbuf_addch(&out, '\n');
-		strbuf_addf(&out, "commit %s\n",
-			sha1_to_hex(commit->object.sha1));
-		pretty_print_commit(rev.commit_format, commit, &out, &ctx);
-	}
-	if (write(fd, out.buf, out.len) < 0)
-		die_errno("Writing SQUASH_MSG");
-	if (close(fd))
-		die_errno("Finishing SQUASH_MSG");
-	strbuf_release(&out);
-}
-
-static void finish(const unsigned char *new_head, const char *msg)
-{
-	struct strbuf reflog_message = STRBUF_INIT;
-
-	if (!msg)
-		strbuf_addstr(&reflog_message, getenv("GIT_REFLOG_ACTION"));
-	else {
-		if (verbosity >= 0)
-			printf("%s\n", msg);
-		strbuf_addf(&reflog_message, "%s: %s",
-			getenv("GIT_REFLOG_ACTION"), msg);
-	}
-	if (squash) {
-		squash_message();
-	} else {
-		if (verbosity >= 0 && !merge_msg.len)
-			printf("No merge message -- not updating HEAD\n");
-		else {
-			const char *argv_gc_auto[] = { "gc", "--auto", NULL };
-			update_ref(reflog_message.buf, "HEAD",
-				new_head, head, 0,
-				DIE_ON_ERR);
-			/*
-			 * We ignore errors in 'gc --auto', since the
-			 * user should see them.
-			 */
-			run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
-		}
-	}
-	if (new_head && show_diffstat) {
-		struct diff_options opts;
-		diff_setup(&opts);
-		opts.output_format |=
-			DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
-		opts.detect_rename = DIFF_DETECT_RENAME;
-		if (diff_use_color_default > 0)
-			DIFF_OPT_SET(&opts, COLOR_DIFF);
-		if (diff_setup_done(&opts) < 0)
-			die("diff_setup_done failed");
-		diff_tree_sha1(head, new_head, "", &opts);
-		diffcore_std(&opts);
-		diff_flush(&opts);
-	}
-
-	/* Run a post-merge hook */
-	run_hook(NULL, "post-merge", squash ? "1" : "0", NULL);
-
-	strbuf_release(&reflog_message);
-}
-
-/* Get the name for the merge commit's message. */
-static void merge_name(const char *remote, struct strbuf *msg)
-{
-	struct object *remote_head;
-	unsigned char branch_head[20], buf_sha[20];
-	struct strbuf buf = STRBUF_INIT;
-	struct strbuf bname = STRBUF_INIT;
-	const char *ptr;
-	char *found_ref;
-	int len, early;
-
-	strbuf_branchname(&bname, remote);
-	remote = bname.buf;
-
-	memset(branch_head, 0, sizeof(branch_head));
-	remote_head = peel_to_type(remote, 0, NULL, OBJ_COMMIT);
-	if (!remote_head)
-		die("'%s' does not point to a commit", remote);
-
-	if (dwim_ref(remote, strlen(remote), branch_head, &found_ref) > 0) {
-		if (!prefixcmp(found_ref, "refs/heads/")) {
-			strbuf_addf(msg, "%s\t\tbranch '%s' of .\n",
-				    sha1_to_hex(branch_head), remote);
-			goto cleanup;
-		}
-		if (!prefixcmp(found_ref, "refs/remotes/")) {
-			strbuf_addf(msg, "%s\t\tremote branch '%s' of .\n",
-				    sha1_to_hex(branch_head), remote);
-			goto cleanup;
-		}
-	}
-
-	/* See if remote matches <name>^^^.. or <name>~<number> */
-	for (len = 0, ptr = remote + strlen(remote);
-	     remote < ptr && ptr[-1] == '^';
-	     ptr--)
-		len++;
-	if (len)
-		early = 1;
-	else {
-		early = 0;
-		ptr = strrchr(remote, '~');
-		if (ptr) {
-			int seen_nonzero = 0;
-
-			len++; /* count ~ */
-			while (*++ptr && isdigit(*ptr)) {
-				seen_nonzero |= (*ptr != '0');
-				len++;
-			}
-			if (*ptr)
-				len = 0; /* not ...~<number> */
-			else if (seen_nonzero)
-				early = 1;
-			else if (len == 1)
-				early = 1; /* "name~" is "name~1"! */
-		}
-	}
-	if (len) {
-		struct strbuf truname = STRBUF_INIT;
-		strbuf_addstr(&truname, "refs/heads/");
-		strbuf_addstr(&truname, remote);
-		strbuf_setlen(&truname, truname.len - len);
-		if (resolve_ref(truname.buf, buf_sha, 0, NULL)) {
-			strbuf_addf(msg,
-				    "%s\t\tbranch '%s'%s of .\n",
-				    sha1_to_hex(remote_head->sha1),
-				    truname.buf + 11,
-				    (early ? " (early part)" : ""));
-			strbuf_release(&truname);
-			goto cleanup;
-		}
-	}
-
-	if (!strcmp(remote, "FETCH_HEAD") &&
-			!access(git_path("FETCH_HEAD"), R_OK)) {
-		FILE *fp;
-		struct strbuf line = STRBUF_INIT;
-		char *ptr;
-
-		fp = fopen(git_path("FETCH_HEAD"), "r");
-		if (!fp)
-			die_errno("could not open '%s' for reading",
-				  git_path("FETCH_HEAD"));
-		strbuf_getline(&line, fp, '\n');
-		fclose(fp);
-		ptr = strstr(line.buf, "\tnot-for-merge\t");
-		if (ptr)
-			strbuf_remove(&line, ptr-line.buf+1, 13);
-		strbuf_addbuf(msg, &line);
-		strbuf_release(&line);
-		goto cleanup;
-	}
-	strbuf_addf(msg, "%s\t\tcommit '%s'\n",
-		sha1_to_hex(remote_head->sha1), remote);
-cleanup:
-	strbuf_release(&buf);
-	strbuf_release(&bname);
-}
-
-static int git_merge_config(const char *k, const char *v, void *cb)
-{
-	if (branch && !prefixcmp(k, "branch.") &&
-		!prefixcmp(k + 7, branch) &&
-		!strcmp(k + 7 + strlen(branch), ".mergeoptions")) {
-		const char **argv;
-		int argc;
-		char *buf;
-
-		buf = xstrdup(v);
-		argc = split_cmdline(buf, &argv);
-		if (argc < 0)
-			die("Bad branch.%s.mergeoptions string", branch);
-		argv = xrealloc(argv, sizeof(*argv) * (argc + 2));
-		memmove(argv + 1, argv, sizeof(*argv) * (argc + 1));
-		argc++;
-		parse_options(argc, argv, NULL, builtin_merge_options,
-			      builtin_merge_usage, 0);
-		free(buf);
-	}
-
-	if (!strcmp(k, "merge.diffstat") || !strcmp(k, "merge.stat"))
-		show_diffstat = git_config_bool(k, v);
-	else if (!strcmp(k, "pull.twohead"))
-		return git_config_string(&pull_twohead, k, v);
-	else if (!strcmp(k, "pull.octopus"))
-		return git_config_string(&pull_octopus, k, v);
-	else if (!strcmp(k, "merge.log") || !strcmp(k, "merge.summary"))
-		option_log = git_config_bool(k, v);
-	return git_diff_ui_config(k, v, cb);
-}
-
-static int read_tree_trivial(unsigned char *common, unsigned char *head,
-			     unsigned char *one)
-{
-	int i, nr_trees = 0;
-	struct tree *trees[MAX_UNPACK_TREES];
-	struct tree_desc t[MAX_UNPACK_TREES];
-	struct unpack_trees_options opts;
-
-	memset(&opts, 0, sizeof(opts));
-	opts.head_idx = 2;
-	opts.src_index = &the_index;
-	opts.dst_index = &the_index;
-	opts.update = 1;
-	opts.verbose_update = 1;
-	opts.trivial_merges_only = 1;
-	opts.merge = 1;
-	trees[nr_trees] = parse_tree_indirect(common);
-	if (!trees[nr_trees++])
-		return -1;
-	trees[nr_trees] = parse_tree_indirect(head);
-	if (!trees[nr_trees++])
-		return -1;
-	trees[nr_trees] = parse_tree_indirect(one);
-	if (!trees[nr_trees++])
-		return -1;
-	opts.fn = threeway_merge;
-	cache_tree_free(&active_cache_tree);
-	for (i = 0; i < nr_trees; i++) {
-		parse_tree(trees[i]);
-		init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
-	}
-	if (unpack_trees(nr_trees, t, &opts))
-		return -1;
-	return 0;
-}
-
-static void write_tree_trivial(unsigned char *sha1)
-{
-	if (write_cache_as_tree(sha1, 0, NULL))
-		die("git write-tree failed to write a tree");
-}
-
-static int try_merge_strategy(const char *strategy, struct commit_list *common,
-			      const char *head_arg)
-{
-	const char **args;
-	int i = 0, x = 0, ret;
-	struct commit_list *j;
-	struct strbuf buf = STRBUF_INIT;
-	int index_fd;
-	struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
-
-	index_fd = hold_locked_index(lock, 1);
-	refresh_cache(REFRESH_QUIET);
-	if (active_cache_changed &&
-			(write_cache(index_fd, active_cache, active_nr) ||
-			 commit_locked_index(lock)))
-		return error("Unable to write index.");
-	rollback_lock_file(lock);
-
-	if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) {
-		int clean;
-		struct commit *result;
-		struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
-		int index_fd;
-		struct commit_list *reversed = NULL;
-		struct merge_options o;
-
-		if (remoteheads->next) {
-			error("Not handling anything other than two heads merge.");
-			return 2;
-		}
-
-		init_merge_options(&o);
-		if (!strcmp(strategy, "subtree"))
-			o.subtree_shift = "";
-
-		for (x = 0; x < xopts_nr; x++) {
-			if (!strcmp(xopts[x], "ours"))
-				o.recursive_variant = MERGE_RECURSIVE_OURS;
-			else if (!strcmp(xopts[x], "theirs"))
-				o.recursive_variant = MERGE_RECURSIVE_THEIRS;
-			else if (!strcmp(xopts[x], "subtree"))
-				o.subtree_shift = "";
-			else if (!prefixcmp(xopts[x], "subtree="))
-				o.subtree_shift = xopts[x]+8;
-			else
-				die("Unknown option for merge-recursive: -X%s", xopts[x]);
-		}
-
-		o.branch1 = head_arg;
-		o.branch2 = remoteheads->item->util;
-
-		for (j = common; j; j = j->next)
-			commit_list_insert(j->item, &reversed);
-
-		index_fd = hold_locked_index(lock, 1);
-		clean = merge_recursive(&o, lookup_commit(head),
-				remoteheads->item, reversed, &result);
-		if (active_cache_changed &&
-				(write_cache(index_fd, active_cache, active_nr) ||
-				 commit_locked_index(lock)))
-			die ("unable to write %s", get_index_file());
-		rollback_lock_file(lock);
-		return clean ? 0 : 1;
-	} else {
-		args = xmalloc((4 + xopts_nr + commit_list_count(common) +
-					commit_list_count(remoteheads)) * sizeof(char *));
-		strbuf_addf(&buf, "merge-%s", strategy);
-		args[i++] = buf.buf;
-		for (x = 0; x < xopts_nr; x++) {
-			char *s = xmalloc(strlen(xopts[x])+2+1);
-			strcpy(s, "--");
-			strcpy(s+2, xopts[x]);
-			args[i++] = s;
-		}
-		for (j = common; j; j = j->next)
-			args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1));
-		args[i++] = "--";
-		args[i++] = head_arg;
-		for (j = remoteheads; j; j = j->next)
-			args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1));
-		args[i] = NULL;
-		ret = run_command_v_opt(args, RUN_GIT_CMD);
-		strbuf_release(&buf);
-		i = 1;
-		for (x = 0; x < xopts_nr; x++)
-			free((void *)args[i++]);
-		for (j = common; j; j = j->next)
-			free((void *)args[i++]);
-		i += 2;
-		for (j = remoteheads; j; j = j->next)
-			free((void *)args[i++]);
-		free(args);
-		discard_cache();
-		if (read_cache() < 0)
-			die("failed to read the cache");
-		resolve_undo_clear();
-		return ret;
-	}
-}
-
-static void count_diff_files(struct diff_queue_struct *q,
-			     struct diff_options *opt, void *data)
-{
-	int *count = data;
-
-	(*count) += q->nr;
-}
-
-static int count_unmerged_entries(void)
-{
-	int i, ret = 0;
-
-	for (i = 0; i < active_nr; i++)
-		if (ce_stage(active_cache[i]))
-			ret++;
-
-	return ret;
-}
-
-static int checkout_fast_forward(unsigned char *head, unsigned char *remote)
-{
-	struct tree *trees[MAX_UNPACK_TREES];
-	struct unpack_trees_options opts;
-	struct tree_desc t[MAX_UNPACK_TREES];
-	int i, fd, nr_trees = 0;
-	struct dir_struct dir;
-	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
-
-	refresh_cache(REFRESH_QUIET);
-
-	fd = hold_locked_index(lock_file, 1);
-
-	memset(&trees, 0, sizeof(trees));
-	memset(&opts, 0, sizeof(opts));
-	memset(&t, 0, sizeof(t));
-	memset(&dir, 0, sizeof(dir));
-	dir.flags |= DIR_SHOW_IGNORED;
-	dir.exclude_per_dir = ".gitignore";
-	opts.dir = &dir;
-
-	opts.head_idx = 1;
-	opts.src_index = &the_index;
-	opts.dst_index = &the_index;
-	opts.update = 1;
-	opts.verbose_update = 1;
-	opts.merge = 1;
-	opts.fn = twoway_merge;
-	opts.msgs = get_porcelain_error_msgs();
-
-	trees[nr_trees] = parse_tree_indirect(head);
-	if (!trees[nr_trees++])
-		return -1;
-	trees[nr_trees] = parse_tree_indirect(remote);
-	if (!trees[nr_trees++])
-		return -1;
-	for (i = 0; i < nr_trees; i++) {
-		parse_tree(trees[i]);
-		init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
-	}
-	if (unpack_trees(nr_trees, t, &opts))
-		return -1;
-	if (write_cache(fd, active_cache, active_nr) ||
-		commit_locked_index(lock_file))
-		die("unable to write new index file");
-	return 0;
-}
-
-static void split_merge_strategies(const char *string, struct strategy **list,
-				   int *nr, int *alloc)
-{
-	char *p, *q, *buf;
-
-	if (!string)
-		return;
-
-	buf = xstrdup(string);
-	q = buf;
-	for (;;) {
-		p = strchr(q, ' ');
-		if (!p) {
-			ALLOC_GROW(*list, *nr + 1, *alloc);
-			(*list)[(*nr)++].name = xstrdup(q);
-			free(buf);
-			return;
-		} else {
-			*p = '\0';
-			ALLOC_GROW(*list, *nr + 1, *alloc);
-			(*list)[(*nr)++].name = xstrdup(q);
-			q = ++p;
-		}
-	}
-}
-
-static void add_strategies(const char *string, unsigned attr)
-{
-	struct strategy *list = NULL;
-	int list_alloc = 0, list_nr = 0, i;
-
-	memset(&list, 0, sizeof(list));
-	split_merge_strategies(string, &list, &list_nr, &list_alloc);
-	if (list) {
-		for (i = 0; i < list_nr; i++)
-			append_strategy(get_strategy(list[i].name));
-		return;
-	}
-	for (i = 0; i < ARRAY_SIZE(all_strategy); i++)
-		if (all_strategy[i].attr & attr)
-			append_strategy(&all_strategy[i]);
-
-}
-
-static int merge_trivial(void)
-{
-	unsigned char result_tree[20], result_commit[20];
-	struct commit_list *parent = xmalloc(sizeof(*parent));
-
-	write_tree_trivial(result_tree);
-	printf("Wonderful.\n");
-	parent->item = lookup_commit(head);
-	parent->next = xmalloc(sizeof(*parent->next));
-	parent->next->item = remoteheads->item;
-	parent->next->next = NULL;
-	commit_tree(merge_msg.buf, result_tree, parent, result_commit, NULL);
-	finish(result_commit, "In-index merge");
-	drop_save();
-	return 0;
-}
-
-static int finish_automerge(struct commit_list *common,
-			    unsigned char *result_tree,
-			    const char *wt_strategy)
-{
-	struct commit_list *parents = NULL, *j;
-	struct strbuf buf = STRBUF_INIT;
-	unsigned char result_commit[20];
-
-	free_commit_list(common);
-	if (allow_fast_forward) {
-		parents = remoteheads;
-		commit_list_insert(lookup_commit(head), &parents);
-		parents = reduce_heads(parents);
-	} else {
-		struct commit_list **pptr = &parents;
-
-		pptr = &commit_list_insert(lookup_commit(head),
-				pptr)->next;
-		for (j = remoteheads; j; j = j->next)
-			pptr = &commit_list_insert(j->item, pptr)->next;
-	}
-	free_commit_list(remoteheads);
-	strbuf_addch(&merge_msg, '\n');
-	commit_tree(merge_msg.buf, result_tree, parents, result_commit, NULL);
-	strbuf_addf(&buf, "Merge made by %s.", wt_strategy);
-	finish(result_commit, buf.buf);
-	strbuf_release(&buf);
-	drop_save();
-	return 0;
-}
-
-static int suggest_conflicts(void)
-{
-	FILE *fp;
-	int pos;
-
-	fp = fopen(git_path("MERGE_MSG"), "a");
-	if (!fp)
-		die_errno("Could not open '%s' for writing",
-			  git_path("MERGE_MSG"));
-	fprintf(fp, "\nConflicts:\n");
-	for (pos = 0; pos < active_nr; pos++) {
-		struct cache_entry *ce = active_cache[pos];
-
-		if (ce_stage(ce)) {
-			fprintf(fp, "\t%s\n", ce->name);
-			while (pos + 1 < active_nr &&
-					!strcmp(ce->name,
-						active_cache[pos + 1]->name))
-				pos++;
-		}
-	}
-	fclose(fp);
-	rerere(allow_rerere_auto);
-	printf("Automatic merge failed; "
-			"fix conflicts and then commit the result.\n");
-	return 1;
-}
-
-static struct commit *is_old_style_invocation(int argc, const char **argv)
-{
-	struct commit *second_token = NULL;
-	if (argc > 2) {
-		unsigned char second_sha1[20];
-
-		if (get_sha1(argv[1], second_sha1))
-			return NULL;
-		second_token = lookup_commit_reference_gently(second_sha1, 0);
-		if (!second_token)
-			die("'%s' is not a commit", argv[1]);
-		if (hashcmp(second_token->object.sha1, head))
-			return NULL;
-	}
-	return second_token;
-}
-
-static int evaluate_result(void)
-{
-	int cnt = 0;
-	struct rev_info rev;
-
-	/* 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_merge(int argc, const char **argv, const char *prefix)
-{
-	unsigned char result_tree[20];
-	struct strbuf buf = STRBUF_INIT;
-	const char *head_arg;
-	int flag, head_invalid = 0, i;
-	int best_cnt = -1, merge_was_ok = 0, automerge_was_ok = 0;
-	struct commit_list *common = NULL;
-	const char *best_strategy = NULL, *wt_strategy = NULL;
-	struct commit_list **remotes = &remoteheads;
-
-	if (read_cache_unmerged()) {
-		die_resolve_conflict("merge");
-	}
-	if (file_exists(git_path("MERGE_HEAD"))) {
-		/*
-		 * There is no unmerged entry, don't advise 'git
-		 * add/rm <file>', just 'git commit'.
-		 */
-		if (advice_resolve_conflict)
-			die("You have not concluded your merge (MERGE_HEAD exists).\n"
-			    "Please, commit your changes before you can merge.");
-		else
-			die("You have not concluded your merge (MERGE_HEAD exists).");
-	}
-
-	resolve_undo_clear();
-	/*
-	 * Check if we are _not_ on a detached HEAD, i.e. if there is a
-	 * current branch.
-	 */
-	branch = resolve_ref("HEAD", head, 0, &flag);
-	if (branch && !prefixcmp(branch, "refs/heads/"))
-		branch += 11;
-	if (is_null_sha1(head))
-		head_invalid = 1;
-
-	git_config(git_merge_config, NULL);
-
-	/* for color.ui */
-	if (diff_use_color_default == -1)
-		diff_use_color_default = git_use_color_default;
-
-	argc = parse_options(argc, argv, prefix, builtin_merge_options,
-			builtin_merge_usage, 0);
-	if (verbosity < 0)
-		show_diffstat = 0;
-
-	if (squash) {
-		if (!allow_fast_forward)
-			die("You cannot combine --squash with --no-ff.");
-		option_commit = 0;
-	}
-
-	if (!allow_fast_forward && fast_forward_only)
-		die("You cannot combine --no-ff with --ff-only.");
-
-	if (!argc)
-		usage_with_options(builtin_merge_usage,
-			builtin_merge_options);
-
-	/*
-	 * This could be traditional "merge <msg> HEAD <commit>..."  and
-	 * the way we can tell it is to see if the second token is HEAD,
-	 * but some people might have misused the interface and used a
-	 * committish that is the same as HEAD there instead.
-	 * Traditional format never would have "-m" so it is an
-	 * additional safety measure to check for it.
-	 */
-
-	if (!have_message && is_old_style_invocation(argc, argv)) {
-		strbuf_addstr(&merge_msg, argv[0]);
-		head_arg = argv[1];
-		argv += 2;
-		argc -= 2;
-	} else if (head_invalid) {
-		struct object *remote_head;
-		/*
-		 * If the merged head is a valid one there is no reason
-		 * to forbid "git merge" into a branch yet to be born.
-		 * We do the same for "git pull".
-		 */
-		if (argc != 1)
-			die("Can merge only exactly one commit into "
-				"empty head");
-		if (squash)
-			die("Squash commit into empty head not supported yet");
-		if (!allow_fast_forward)
-			die("Non-fast-forward commit does not make sense into "
-			    "an empty head");
-		remote_head = peel_to_type(argv[0], 0, NULL, OBJ_COMMIT);
-		if (!remote_head)
-			die("%s - not something we can merge", argv[0]);
-		update_ref("initial pull", "HEAD", remote_head->sha1, NULL, 0,
-				DIE_ON_ERR);
-		reset_hard(remote_head->sha1, 0);
-		return 0;
-	} else {
-		struct strbuf msg = STRBUF_INIT;
-
-		/* We are invoked directly as the first-class UI. */
-		head_arg = "HEAD";
-
-		/*
-		 * All the rest are the commits being merged;
-		 * prepare the standard merge summary message to
-		 * be appended to the given message.  If remote
-		 * is invalid we will die later in the common
-		 * codepath so we discard the error in this
-		 * loop.
-		 */
-		if (!have_message) {
-			for (i = 0; i < argc; i++)
-				merge_name(argv[i], &msg);
-			fmt_merge_msg(option_log, &msg, &merge_msg);
-			if (merge_msg.len)
-				strbuf_setlen(&merge_msg, merge_msg.len-1);
-		}
-	}
-
-	if (head_invalid || !argc)
-		usage_with_options(builtin_merge_usage,
-			builtin_merge_options);
-
-	strbuf_addstr(&buf, "merge");
-	for (i = 0; i < argc; i++)
-		strbuf_addf(&buf, " %s", argv[i]);
-	setenv("GIT_REFLOG_ACTION", buf.buf, 0);
-	strbuf_reset(&buf);
-
-	for (i = 0; i < argc; i++) {
-		struct object *o;
-		struct commit *commit;
-
-		o = peel_to_type(argv[i], 0, NULL, OBJ_COMMIT);
-		if (!o)
-			die("%s - not something we can merge", argv[i]);
-		commit = lookup_commit(o->sha1);
-		commit->util = (void *)argv[i];
-		remotes = &commit_list_insert(commit, remotes)->next;
-
-		strbuf_addf(&buf, "GITHEAD_%s", sha1_to_hex(o->sha1));
-		setenv(buf.buf, argv[i], 1);
-		strbuf_reset(&buf);
-	}
-
-	if (!use_strategies) {
-		if (!remoteheads->next)
-			add_strategies(pull_twohead, DEFAULT_TWOHEAD);
-		else
-			add_strategies(pull_octopus, DEFAULT_OCTOPUS);
-	}
-
-	for (i = 0; i < use_strategies_nr; i++) {
-		if (use_strategies[i]->attr & NO_FAST_FORWARD)
-			allow_fast_forward = 0;
-		if (use_strategies[i]->attr & NO_TRIVIAL)
-			allow_trivial = 0;
-	}
-
-	if (!remoteheads->next)
-		common = get_merge_bases(lookup_commit(head),
-				remoteheads->item, 1);
-	else {
-		struct commit_list *list = remoteheads;
-		commit_list_insert(lookup_commit(head), &list);
-		common = get_octopus_merge_bases(list);
-		free(list);
-	}
-
-	update_ref("updating ORIG_HEAD", "ORIG_HEAD", head, NULL, 0,
-		DIE_ON_ERR);
-
-	if (!common)
-		; /* No common ancestors found. We need a real merge. */
-	else if (!remoteheads->next && !common->next &&
-			common->item == remoteheads->item) {
-		/*
-		 * If head can reach all the merge then we are up to date.
-		 * but first the most common case of merging one remote.
-		 */
-		finish_up_to_date("Already up-to-date.");
-		return 0;
-	} else if (allow_fast_forward && !remoteheads->next &&
-			!common->next &&
-			!hashcmp(common->item->object.sha1, head)) {
-		/* Again the most common case of merging one remote. */
-		struct strbuf msg = STRBUF_INIT;
-		struct object *o;
-		char hex[41];
-
-		strcpy(hex, find_unique_abbrev(head, DEFAULT_ABBREV));
-
-		if (verbosity >= 0)
-			printf("Updating %s..%s\n",
-				hex,
-				find_unique_abbrev(remoteheads->item->object.sha1,
-				DEFAULT_ABBREV));
-		strbuf_addstr(&msg, "Fast-forward");
-		if (have_message)
-			strbuf_addstr(&msg,
-				" (no commit created; -m option ignored)");
-		o = peel_to_type(sha1_to_hex(remoteheads->item->object.sha1),
-			0, NULL, OBJ_COMMIT);
-		if (!o)
-			return 1;
-
-		if (checkout_fast_forward(head, remoteheads->item->object.sha1))
-			return 1;
-
-		finish(o->sha1, msg.buf);
-		drop_save();
-		return 0;
-	} else if (!remoteheads->next && common->next)
-		;
-		/*
-		 * We are not doing octopus and not fast-forward.  Need
-		 * a real merge.
-		 */
-	else if (!remoteheads->next && !common->next && option_commit) {
-		/*
-		 * We are not doing octopus, not fast-forward, and have
-		 * only one common.
-		 */
-		refresh_cache(REFRESH_QUIET);
-		if (allow_trivial && !fast_forward_only) {
-			/* See if it is really trivial. */
-			git_committer_info(IDENT_ERROR_ON_NO_NAME);
-			printf("Trying really trivial in-index merge...\n");
-			if (!read_tree_trivial(common->item->object.sha1,
-					head, remoteheads->item->object.sha1))
-				return merge_trivial();
-			printf("Nope.\n");
-		}
-	} else {
-		/*
-		 * An octopus.  If we can reach all the remote we are up
-		 * to date.
-		 */
-		int up_to_date = 1;
-		struct commit_list *j;
-
-		for (j = remoteheads; j; j = j->next) {
-			struct commit_list *common_one;
-
-			/*
-			 * Here we *have* to calculate the individual
-			 * merge_bases again, otherwise "git merge HEAD^
-			 * HEAD^^" would be missed.
-			 */
-			common_one = get_merge_bases(lookup_commit(head),
-				j->item, 1);
-			if (hashcmp(common_one->item->object.sha1,
-				j->item->object.sha1)) {
-				up_to_date = 0;
-				break;
-			}
-		}
-		if (up_to_date) {
-			finish_up_to_date("Already up-to-date. Yeeah!");
-			return 0;
-		}
-	}
-
-	if (fast_forward_only)
-		die("Not possible to fast-forward, aborting.");
-
-	/* We are going to make a new commit. */
-	git_committer_info(IDENT_ERROR_ON_NO_NAME);
-
-	/*
-	 * At this point, we need a real merge.  No matter what strategy
-	 * we use, it would operate on the index, possibly affecting the
-	 * working tree, and when resolved cleanly, have the desired
-	 * tree in the index -- this means that the index must be in
-	 * sync with the head commit.  The strategies are responsible
-	 * to ensure this.
-	 */
-	if (use_strategies_nr != 1) {
-		/*
-		 * Stash away the local changes so that we can try more
-		 * than one.
-		 */
-		save_state();
-	} else {
-		memcpy(stash, null_sha1, 20);
-	}
-
-	for (i = 0; i < use_strategies_nr; i++) {
-		int ret;
-		if (i) {
-			printf("Rewinding the tree to pristine...\n");
-			restore_state();
-		}
-		if (use_strategies_nr != 1)
-			printf("Trying merge strategy %s...\n",
-				use_strategies[i]->name);
-		/*
-		 * Remember which strategy left the state in the working
-		 * tree.
-		 */
-		wt_strategy = use_strategies[i]->name;
-
-		ret = try_merge_strategy(use_strategies[i]->name,
-			common, head_arg);
-		if (!option_commit && !ret) {
-			merge_was_ok = 1;
-			/*
-			 * This is necessary here just to avoid writing
-			 * the tree, but later we will *not* exit with
-			 * status code 1 because merge_was_ok is set.
-			 */
-			ret = 1;
-		}
-
-		if (ret) {
-			/*
-			 * The backend exits with 1 when conflicts are
-			 * left to be resolved, with 2 when it does not
-			 * handle the given merge at all.
-			 */
-			if (ret == 1) {
-				int cnt = evaluate_result();
-
-				if (best_cnt <= 0 || cnt <= best_cnt) {
-					best_strategy = use_strategies[i]->name;
-					best_cnt = cnt;
-				}
-			}
-			if (merge_was_ok)
-				break;
-			else
-				continue;
-		}
-
-		/* Automerge succeeded. */
-		write_tree_trivial(result_tree);
-		automerge_was_ok = 1;
-		break;
-	}
-
-	/*
-	 * If we have a resulting tree, that means the strategy module
-	 * auto resolved the merge cleanly.
-	 */
-	if (automerge_was_ok)
-		return finish_automerge(common, result_tree, wt_strategy);
-
-	/*
-	 * Pick the result from the best strategy and have the user fix
-	 * it up.
-	 */
-	if (!best_strategy) {
-		restore_state();
-		if (use_strategies_nr > 1)
-			fprintf(stderr,
-				"No merge strategy handled the merge.\n");
-		else
-			fprintf(stderr, "Merge with strategy %s failed.\n",
-				use_strategies[0]->name);
-		return 2;
-	} else if (best_strategy == wt_strategy)
-		; /* We already have its result in the working tree. */
-	else {
-		printf("Rewinding the tree to pristine...\n");
-		restore_state();
-		printf("Using the %s to prepare resolving by hand.\n",
-			best_strategy);
-		try_merge_strategy(best_strategy, common, head_arg);
-	}
-
-	if (squash)
-		finish(NULL, NULL);
-	else {
-		int fd;
-		struct commit_list *j;
-
-		for (j = remoteheads; j; j = j->next)
-			strbuf_addf(&buf, "%s\n",
-				sha1_to_hex(j->item->object.sha1));
-		fd = open(git_path("MERGE_HEAD"), O_WRONLY | O_CREAT, 0666);
-		if (fd < 0)
-			die_errno("Could not open '%s' for writing",
-				  git_path("MERGE_HEAD"));
-		if (write_in_full(fd, buf.buf, buf.len) != buf.len)
-			die_errno("Could not write to '%s'", git_path("MERGE_HEAD"));
-		close(fd);
-		strbuf_addch(&merge_msg, '\n');
-		fd = open(git_path("MERGE_MSG"), O_WRONLY | O_CREAT, 0666);
-		if (fd < 0)
-			die_errno("Could not open '%s' for writing",
-				  git_path("MERGE_MSG"));
-		if (write_in_full(fd, merge_msg.buf, merge_msg.len) !=
-			merge_msg.len)
-			die_errno("Could not write to '%s'", git_path("MERGE_MSG"));
-		close(fd);
-		fd = open(git_path("MERGE_MODE"), O_WRONLY | O_CREAT | O_TRUNC, 0666);
-		if (fd < 0)
-			die_errno("Could not open '%s' for writing",
-				  git_path("MERGE_MODE"));
-		strbuf_reset(&buf);
-		if (!allow_fast_forward)
-			strbuf_addf(&buf, "no-ff");
-		if (write_in_full(fd, buf.buf, buf.len) != buf.len)
-			die_errno("Could not write to '%s'", git_path("MERGE_MODE"));
-		close(fd);
-	}
-
-	if (merge_was_ok) {
-		fprintf(stderr, "Automatic merge went well; "
-			"stopped before committing as requested\n");
-		return 0;
-	} else
-		return suggest_conflicts();
-}