[thirdparty/git.git] / ll-merge.c

/*
 * Low level 3-way in-core file merge.
 *
 * Copyright (c) 2007 Junio C Hamano
 */

#include "cache.h"
#include "attr.h"
#include "xdiff-interface.h"
#include "run-command.h"
#include "ll-merge.h"

struct ll_merge_driver;

typedef int (*ll_merge_fn)(const struct ll_merge_driver *,
			   mmbuffer_t *result,
			   const char *path,
			   mmfile_t *orig, const char *orig_name,
			   mmfile_t *src1, const char *name1,
			   mmfile_t *src2, const char *name2,
			   const struct ll_merge_options *opts,
			   int marker_size);

struct ll_merge_driver {
	const char *name;
	const char *description;
	ll_merge_fn fn;
	const char *recursive;
	struct ll_merge_driver *next;
	char *cmdline;
};

/*
 * Built-in low-levels
 */
static int ll_binary_merge(const struct ll_merge_driver *drv_unused,
			   mmbuffer_t *result,
			   const char *path,
			   mmfile_t *orig, const char *orig_name,
			   mmfile_t *src1, const char *name1,
			   mmfile_t *src2, const char *name2,
			   const struct ll_merge_options *opts,
			   int marker_size)
{
	mmfile_t *stolen;
	assert(opts);

	/*
	 * The tentative merge result is the or common ancestor for an internal merge.
	 */
	if (opts->virtual_ancestor) {
		stolen = orig;
	} else {
		switch (opts->variant) {
		default:
			warning("Cannot merge binary files: %s (%s vs. %s)",
				path, name1, name2);
			/* fallthru */
		case XDL_MERGE_FAVOR_OURS:
			stolen = src1;
			break;
		case XDL_MERGE_FAVOR_THEIRS:
			stolen = src2;
			break;
		}
	}

	result->ptr = stolen->ptr;
	result->size = stolen->size;
	stolen->ptr = NULL;

	/*
	 * With -Xtheirs or -Xours, we have cleanly merged;
	 * otherwise we got a conflict.
	 */
	return (opts->variant ? 0 : 1);
}

static int ll_xdl_merge(const struct ll_merge_driver *drv_unused,
			mmbuffer_t *result,
			const char *path,
			mmfile_t *orig, const char *orig_name,
			mmfile_t *src1, const char *name1,
			mmfile_t *src2, const char *name2,
			const struct ll_merge_options *opts,
			int marker_size)
{
	xmparam_t xmp;
	assert(opts);

	if (buffer_is_binary(orig->ptr, orig->size) ||
	    buffer_is_binary(src1->ptr, src1->size) ||
	    buffer_is_binary(src2->ptr, src2->size)) {
		return ll_binary_merge(drv_unused, result,
				       path,
				       orig, orig_name,
				       src1, name1,
				       src2, name2,
				       opts, marker_size);
	}

	memset(&xmp, 0, sizeof(xmp));
	xmp.level = XDL_MERGE_ZEALOUS;
	xmp.favor = opts->variant;
	xmp.xpp.flags = opts->xdl_opts;
	if (git_xmerge_style >= 0)
		xmp.style = git_xmerge_style;
	if (marker_size > 0)
		xmp.marker_size = marker_size;
	xmp.ancestor = orig_name;
	xmp.file1 = name1;
	xmp.file2 = name2;
	return xdl_merge(orig, src1, src2, &xmp, result);
}

static int ll_union_merge(const struct ll_merge_driver *drv_unused,
			  mmbuffer_t *result,
			  const char *path_unused,
			  mmfile_t *orig, const char *orig_name,
			  mmfile_t *src1, const char *name1,
			  mmfile_t *src2, const char *name2,
			  const struct ll_merge_options *opts,
			  int marker_size)
{
	/* Use union favor */
	struct ll_merge_options o;
	assert(opts);
	o = *opts;
	o.variant = XDL_MERGE_FAVOR_UNION;
	return ll_xdl_merge(drv_unused, result, path_unused,
			    orig, NULL, src1, NULL, src2, NULL,
			    &o, marker_size);
}

#define LL_BINARY_MERGE 0
#define LL_TEXT_MERGE 1
#define LL_UNION_MERGE 2
static struct ll_merge_driver ll_merge_drv[] = {
	{ "binary", "built-in binary merge", ll_binary_merge },
	{ "text", "built-in 3-way text merge", ll_xdl_merge },
	{ "union", "built-in union merge", ll_union_merge },
};

static void create_temp(mmfile_t *src, char *path)
{
	int fd;

	strcpy(path, ".merge_file_XXXXXX");
	fd = xmkstemp(path);
	if (write_in_full(fd, src->ptr, src->size) != src->size)
		die_errno("unable to write temp-file");
	close(fd);
}

/*
 * User defined low-level merge driver support.
 */
static int ll_ext_merge(const struct ll_merge_driver *fn,
			mmbuffer_t *result,
			const char *path,
			mmfile_t *orig, const char *orig_name,
			mmfile_t *src1, const char *name1,
			mmfile_t *src2, const char *name2,
			const struct ll_merge_options *opts,
			int marker_size)
{
	char temp[4][50];
	struct strbuf cmd = STRBUF_INIT;
	struct strbuf_expand_dict_entry dict[5];
	const char *args[] = { NULL, NULL };
	int status, fd, i;
	struct stat st;
	assert(opts);

	dict[0].placeholder = "O"; dict[0].value = temp[0];
	dict[1].placeholder = "A"; dict[1].value = temp[1];
	dict[2].placeholder = "B"; dict[2].value = temp[2];
	dict[3].placeholder = "L"; dict[3].value = temp[3];
	dict[4].placeholder = NULL; dict[4].value = NULL;

	if (fn->cmdline == NULL)
		die("custom merge driver %s lacks command line.", fn->name);

	result->ptr = NULL;
	result->size = 0;
	create_temp(orig, temp[0]);
	create_temp(src1, temp[1]);
	create_temp(src2, temp[2]);
	sprintf(temp[3], "%d", marker_size);

	strbuf_expand(&cmd, fn->cmdline, strbuf_expand_dict_cb, &dict);

	args[0] = cmd.buf;
	status = run_command_v_opt(args, RUN_USING_SHELL);
	fd = open(temp[1], O_RDONLY);
	if (fd < 0)
		goto bad;
	if (fstat(fd, &st))
		goto close_bad;
	result->size = st.st_size;
	result->ptr = xmalloc(result->size + 1);
	if (read_in_full(fd, result->ptr, result->size) != result->size) {
		free(result->ptr);
		result->ptr = NULL;
		result->size = 0;
	}
 close_bad:
	close(fd);
 bad:
	for (i = 0; i < 3; i++)
		unlink_or_warn(temp[i]);
	strbuf_release(&cmd);
	return status;
}

/*
 * merge.default and merge.driver configuration items
 */
static struct ll_merge_driver *ll_user_merge, **ll_user_merge_tail;
static const char *default_ll_merge;

static int read_merge_config(const char *var, const char *value, void *cb)
{
	struct ll_merge_driver *fn;
	const char *key, *name;
	int namelen;

	if (!strcmp(var, "merge.default")) {
		if (value)
			default_ll_merge = xstrdup(value);
		return 0;
	}

	/*
	 * We are not interested in anything but "merge.<name>.variable";
	 * especially, we do not want to look at variables such as
	 * "merge.summary", "merge.tool", and "merge.verbosity".
	 */
	if (parse_config_key(var, "merge", &name, &namelen, &key) < 0 || !name)
		return 0;

	/*
	 * Find existing one as we might be processing merge.<name>.var2
	 * after seeing merge.<name>.var1.
	 */
	for (fn = ll_user_merge; fn; fn = fn->next)
		if (!strncmp(fn->name, name, namelen) && !fn->name[namelen])
			break;
	if (!fn) {
		fn = xcalloc(1, sizeof(struct ll_merge_driver));
		fn->name = xmemdupz(name, namelen);
		fn->fn = ll_ext_merge;
		*ll_user_merge_tail = fn;
		ll_user_merge_tail = &(fn->next);
	}

	if (!strcmp("name", key)) {
		if (!value)
			return error("%s: lacks value", var);
		fn->description = xstrdup(value);
		return 0;
	}

	if (!strcmp("driver", key)) {
		if (!value)
			return error("%s: lacks value", var);
		/*
		 * merge.<name>.driver specifies the command line:
		 *
		 *	command-line
		 *
		 * The command-line will be interpolated with the following
		 * tokens and is given to the shell:
		 *
		 *    %O - temporary file name for the merge base.
		 *    %A - temporary file name for our version.
		 *    %B - temporary file name for the other branches' version.
		 *    %L - conflict marker length
		 *
		 * The external merge driver should write the results in the
		 * file named by %A, and signal that it has done with zero exit
		 * status.
		 */
		fn->cmdline = xstrdup(value);
		return 0;
	}

	if (!strcmp("recursive", key)) {
		if (!value)
			return error("%s: lacks value", var);
		fn->recursive = xstrdup(value);
		return 0;
	}

	return 0;
}

static void initialize_ll_merge(void)
{
	if (ll_user_merge_tail)
		return;
	ll_user_merge_tail = &ll_user_merge;
	git_config(read_merge_config, NULL);
}

static const struct ll_merge_driver *find_ll_merge_driver(const char *merge_attr)
{
	struct ll_merge_driver *fn;
	const char *name;
	int i;

	initialize_ll_merge();

	if (ATTR_TRUE(merge_attr))
		return &ll_merge_drv[LL_TEXT_MERGE];
	else if (ATTR_FALSE(merge_attr))
		return &ll_merge_drv[LL_BINARY_MERGE];
	else if (ATTR_UNSET(merge_attr)) {
		if (!default_ll_merge)
			return &ll_merge_drv[LL_TEXT_MERGE];
		else
			name = default_ll_merge;
	}
	else
		name = merge_attr;

	for (fn = ll_user_merge; fn; fn = fn->next)
		if (!strcmp(fn->name, name))
			return fn;

	for (i = 0; i < ARRAY_SIZE(ll_merge_drv); i++)
		if (!strcmp(ll_merge_drv[i].name, name))
			return &ll_merge_drv[i];

	/* default to the 3-way */
	return &ll_merge_drv[LL_TEXT_MERGE];
}

static int git_path_check_merge(const char *path, struct git_attr_check check[2])
{
	if (!check[0].attr) {
		check[0].attr = git_attr("merge");
		check[1].attr = git_attr("conflict-marker-size");
	}
	return git_check_attr(path, 2, check);
}

static void normalize_file(mmfile_t *mm, const char *path)
{
	struct strbuf strbuf = STRBUF_INIT;
	if (renormalize_buffer(path, mm->ptr, mm->size, &strbuf)) {
		free(mm->ptr);
		mm->size = strbuf.len;
		mm->ptr = strbuf_detach(&strbuf, NULL);
	}
}

int ll_merge(mmbuffer_t *result_buf,
	     const char *path,
	     mmfile_t *ancestor, const char *ancestor_label,
	     mmfile_t *ours, const char *our_label,
	     mmfile_t *theirs, const char *their_label,
	     const struct ll_merge_options *opts)
{
	static struct git_attr_check check[2];
	static const struct ll_merge_options default_opts;
	const char *ll_driver_name = NULL;
	int marker_size = DEFAULT_CONFLICT_MARKER_SIZE;
	const struct ll_merge_driver *driver;

	if (!opts)
		opts = &default_opts;

	if (opts->renormalize) {
		normalize_file(ancestor, path);
		normalize_file(ours, path);
		normalize_file(theirs, path);
	}
	if (!git_path_check_merge(path, check)) {
		ll_driver_name = check[0].value;
		if (check[1].value) {
			marker_size = atoi(check[1].value);
			if (marker_size <= 0)
				marker_size = DEFAULT_CONFLICT_MARKER_SIZE;
		}
	}
	driver = find_ll_merge_driver(ll_driver_name);
	if (opts->virtual_ancestor && driver->recursive)
		driver = find_ll_merge_driver(driver->recursive);
	return driver->fn(driver, result_buf, path, ancestor, ancestor_label,
			  ours, our_label, theirs, their_label,
			  opts, marker_size);
}

int ll_merge_marker_size(const char *path)
{
	static struct git_attr_check check;
	int marker_size = DEFAULT_CONFLICT_MARKER_SIZE;

	if (!check.attr)
		check.attr = git_attr("conflict-marker-size");
	if (!git_check_attr(path, 1, &check) && check.value) {
		marker_size = atoi(check.value);
		if (marker_size <= 0)
			marker_size = DEFAULT_CONFLICT_MARKER_SIZE;
	}
	return marker_size;
}
Commit	Line	Data
525ab639 JH	1	/*
	2	* Low level 3-way in-core file merge.
	3	*
	4	* Copyright (c) 2007 Junio C Hamano
	5	*/
	6
	7	#include "cache.h"
	8	#include "attr.h"
	9	#include "xdiff-interface.h"
	10	#include "run-command.h"
525ab639 JH	11	#include "ll-merge.h"
	12
	13	struct ll_merge_driver;
	14
	15	typedef int (ll_merge_fn)(const struct ll_merge_driver ,
	16	mmbuffer_t *result,
	17	const char *path,
f01de62e	18	mmfile_t orig, const char orig_name,
525ab639 JH	19	mmfile_t src1, const char name1,
525ab639 JH	20	mmfile_t src2, const char name2,
712516bc	21	const struct ll_merge_options *opts,
23a64c9e	22	int marker_size);
525ab639 JH	23
	24	struct ll_merge_driver {
	25	const char *name;
	26	const char *description;
	27	ll_merge_fn fn;
	28	const char *recursive;
	29	struct ll_merge_driver *next;
	30	char *cmdline;
	31	};
	32
	33	/*
	34	* Built-in low-levels
	35	*/
	36	static int ll_binary_merge(const struct ll_merge_driver *drv_unused,
	37	mmbuffer_t *result,
e0e2065f	38	const char *path,
f01de62e	39	mmfile_t orig, const char orig_name,
525ab639 JH	40	mmfile_t src1, const char name1,
525ab639 JH	41	mmfile_t src2, const char name2,
712516bc JN	42	const struct ll_merge_options *opts,
712516bc JN	43	int marker_size)
525ab639	44	{
712516bc JN	45	mmfile_t *stolen;
	46	assert(opts);
	47
525ab639	48	/*
a944af1d	49	* The tentative merge result is the or common ancestor for an internal merge.
525ab639	50	*/
a944af1d JH	51	if (opts->virtual_ancestor) {
	52	stolen = orig;
	53	} else {
	54	switch (opts->variant) {
	55	default:
e6d29a4b	56	warning("Cannot merge binary files: %s (%s vs. %s)",
e0e2065f JH	57	path, name1, name2);
e0e2065f JH	58	/* fallthru */
a944af1d JH	59	case XDL_MERGE_FAVOR_OURS:
	60	stolen = src1;
	61	break;
	62	case XDL_MERGE_FAVOR_THEIRS:
	63	stolen = src2;
	64	break;
	65	}
	66	}
525ab639 JH	67
	68	result->ptr = stolen->ptr;
	69	result->size = stolen->size;
	70	stolen->ptr = NULL;
a944af1d JH	71
	72	/*
	73	* With -Xtheirs or -Xours, we have cleanly merged;
	74	* otherwise we got a conflict.
	75	*/
	76	return (opts->variant ? 0 : 1);
525ab639 JH	77	}
	78
	79	static int ll_xdl_merge(const struct ll_merge_driver *drv_unused,
	80	mmbuffer_t *result,
606475f3	81	const char *path,
f01de62e	82	mmfile_t orig, const char orig_name,
525ab639 JH	83	mmfile_t src1, const char name1,
525ab639 JH	84	mmfile_t src2, const char name2,
712516bc JN	85	const struct ll_merge_options *opts,
712516bc JN	86	int marker_size)
525ab639	87	{
00f8f97d	88	xmparam_t xmp;
712516bc	89	assert(opts);
525ab639 JH	90
	91	if (buffer_is_binary(orig->ptr, orig->size) \|\|
	92	buffer_is_binary(src1->ptr, src1->size) \|\|
	93	buffer_is_binary(src2->ptr, src2->size)) {
525ab639	94	return ll_binary_merge(drv_unused, result,
606475f3	95	path,
f01de62e JN	96	orig, orig_name,
f01de62e JN	97	src1, name1,
525ab639	98	src2, name2,
712516bc	99	opts, marker_size);
525ab639 JH	100	}
525ab639 JH	101
00f8f97d	102	memset(&xmp, 0, sizeof(xmp));
560119b9	103	xmp.level = XDL_MERGE_ZEALOUS;
712516bc	104	xmp.favor = opts->variant;
58a1ece4	105	xmp.xpp.flags = opts->xdl_opts;
c236bcd0	106	if (git_xmerge_style >= 0)
560119b9	107	xmp.style = git_xmerge_style;
23a64c9e JH	108	if (marker_size > 0)
23a64c9e JH	109	xmp.marker_size = marker_size;
f01de62e	110	xmp.ancestor = orig_name;
a4b5e91c JN	111	xmp.file1 = name1;
	112	xmp.file2 = name2;
	113	return xdl_merge(orig, src1, src2, &xmp, result);
525ab639 JH	114	}
	115
	116	static int ll_union_merge(const struct ll_merge_driver *drv_unused,
	117	mmbuffer_t *result,
	118	const char *path_unused,
f01de62e	119	mmfile_t orig, const char orig_name,
525ab639 JH	120	mmfile_t src1, const char name1,
525ab639 JH	121	mmfile_t src2, const char name2,
712516bc JN	122	const struct ll_merge_options *opts,
712516bc JN	123	int marker_size)
525ab639	124	{
cd1d61c4	125	/* Use union favor */
712516bc JN	126	struct ll_merge_options o;
	127	assert(opts);
	128	o = *opts;
	129	o.variant = XDL_MERGE_FAVOR_UNION;
cd1d61c4	130	return ll_xdl_merge(drv_unused, result, path_unused,
f01de62e	131	orig, NULL, src1, NULL, src2, NULL,
712516bc	132	&o, marker_size);
525ab639 JH	133	}
	134
	135	#define LL_BINARY_MERGE 0
	136	#define LL_TEXT_MERGE 1
	137	#define LL_UNION_MERGE 2
	138	static struct ll_merge_driver ll_merge_drv[] = {
	139	{ "binary", "built-in binary merge", ll_binary_merge },
	140	{ "text", "built-in 3-way text merge", ll_xdl_merge },
	141	{ "union", "built-in union merge", ll_union_merge },
	142	};
	143
	144	static void create_temp(mmfile_t src, char path)
	145	{
	146	int fd;
	147
	148	strcpy(path, ".merge_file_XXXXXX");
	149	fd = xmkstemp(path);
	150	if (write_in_full(fd, src->ptr, src->size) != src->size)
0721c314	151	die_errno("unable to write temp-file");
525ab639 JH	152	close(fd);
	153	}
	154
	155	/*
	156	* User defined low-level merge driver support.
	157	*/
	158	static int ll_ext_merge(const struct ll_merge_driver *fn,
	159	mmbuffer_t *result,
	160	const char *path,
f01de62e	161	mmfile_t orig, const char orig_name,
525ab639 JH	162	mmfile_t src1, const char name1,
525ab639 JH	163	mmfile_t src2, const char name2,
712516bc JN	164	const struct ll_merge_options *opts,
712516bc JN	165	int marker_size)
525ab639	166	{
23a64c9e	167	char temp[4][50];
ced621b2	168	struct strbuf cmd = STRBUF_INIT;
66dbfd55	169	struct strbuf_expand_dict_entry dict[5];
ac0ba18d	170	const char *args[] = { NULL, NULL };
525ab639 JH	171	int status, fd, i;
525ab639 JH	172	struct stat st;
712516bc	173	assert(opts);
525ab639	174
66dbfd55 GV	175	dict[0].placeholder = "O"; dict[0].value = temp[0];
	176	dict[1].placeholder = "A"; dict[1].value = temp[1];
	177	dict[2].placeholder = "B"; dict[2].value = temp[2];
	178	dict[3].placeholder = "L"; dict[3].value = temp[3];
	179	dict[4].placeholder = NULL; dict[4].value = NULL;
	180
525ab639 JH	181	if (fn->cmdline == NULL)
	182	die("custom merge driver %s lacks command line.", fn->name);
	183
	184	result->ptr = NULL;
	185	result->size = 0;
	186	create_temp(orig, temp[0]);
	187	create_temp(src1, temp[1]);
	188	create_temp(src2, temp[2]);
23a64c9e	189	sprintf(temp[3], "%d", marker_size);
525ab639	190
ced621b2	191	strbuf_expand(&cmd, fn->cmdline, strbuf_expand_dict_cb, &dict);
525ab639	192
ac0ba18d JK	193	args[0] = cmd.buf;
ac0ba18d JK	194	status = run_command_v_opt(args, RUN_USING_SHELL);
525ab639 JH	195	fd = open(temp[1], O_RDONLY);
	196	if (fd < 0)
	197	goto bad;
	198	if (fstat(fd, &st))
	199	goto close_bad;
	200	result->size = st.st_size;
	201	result->ptr = xmalloc(result->size + 1);
	202	if (read_in_full(fd, result->ptr, result->size) != result->size) {
	203	free(result->ptr);
	204	result->ptr = NULL;
	205	result->size = 0;
	206	}
	207	close_bad:
	208	close(fd);
	209	bad:
	210	for (i = 0; i < 3; i++)
691f1a28	211	unlink_or_warn(temp[i]);
ced621b2	212	strbuf_release(&cmd);
525ab639 JH	213	return status;
	214	}
	215
	216	/*
	217	* merge.default and merge.driver configuration items
	218	*/
	219	static struct ll_merge_driver ll_user_merge, *ll_user_merge_tail;
	220	static const char *default_ll_merge;
	221
ef90d6d4	222	static int read_merge_config(const char var, const char value, void *cb)
525ab639 JH	223	{
525ab639 JH	224	struct ll_merge_driver *fn;
d731f0ad	225	const char key, name;
525ab639 JH	226	int namelen;
	227
	228	if (!strcmp(var, "merge.default")) {
	229	if (value)
90dce515	230	default_ll_merge = xstrdup(value);
525ab639 JH	231	return 0;
	232	}
	233
	234	/*
	235	* We are not interested in anything but "merge.<name>.variable";
	236	* especially, we do not want to look at variables such as
	237	* "merge.summary", "merge.tool", and "merge.verbosity".
	238	*/
d731f0ad	239	if (parse_config_key(var, "merge", &name, &namelen, &key) < 0 \|\| !name)
525ab639 JH	240	return 0;
	241
	242	/*
	243	* Find existing one as we might be processing merge.<name>.var2
	244	* after seeing merge.<name>.var1.
	245	*/
525ab639 JH	246	for (fn = ll_user_merge; fn; fn = fn->next)
	247	if (!strncmp(fn->name, name, namelen) && !fn->name[namelen])
	248	break;
	249	if (!fn) {
	250	fn = xcalloc(1, sizeof(struct ll_merge_driver));
	251	fn->name = xmemdupz(name, namelen);
	252	fn->fn = ll_ext_merge;
	253	*ll_user_merge_tail = fn;
	254	ll_user_merge_tail = &(fn->next);
	255	}
	256
d731f0ad	257	if (!strcmp("name", key)) {
525ab639 JH	258	if (!value)
525ab639 JH	259	return error("%s: lacks value", var);
90dce515	260	fn->description = xstrdup(value);
525ab639 JH	261	return 0;
	262	}
	263
d731f0ad	264	if (!strcmp("driver", key)) {
525ab639 JH	265	if (!value)
	266	return error("%s: lacks value", var);
	267	/*
	268	* merge.<name>.driver specifies the command line:
	269	*
	270	* command-line
	271	*
	272	* The command-line will be interpolated with the following
	273	* tokens and is given to the shell:
	274	*
	275	* %O - temporary file name for the merge base.
	276	* %A - temporary file name for our version.
	277	* %B - temporary file name for the other branches' version.
23a64c9e	278	* %L - conflict marker length
525ab639 JH	279	*
	280	* The external merge driver should write the results in the
	281	* file named by %A, and signal that it has done with zero exit
	282	* status.
	283	*/
90dce515	284	fn->cmdline = xstrdup(value);
525ab639 JH	285	return 0;
	286	}
	287
d731f0ad	288	if (!strcmp("recursive", key)) {
525ab639 JH	289	if (!value)
525ab639 JH	290	return error("%s: lacks value", var);
90dce515	291	fn->recursive = xstrdup(value);
525ab639 JH	292	return 0;
	293	}
	294
	295	return 0;
	296	}
	297
	298	static void initialize_ll_merge(void)
	299	{
	300	if (ll_user_merge_tail)
	301	return;
	302	ll_user_merge_tail = &ll_user_merge;
ef90d6d4	303	git_config(read_merge_config, NULL);
525ab639 JH	304	}
	305
	306	static const struct ll_merge_driver find_ll_merge_driver(const char merge_attr)
	307	{
	308	struct ll_merge_driver *fn;
	309	const char *name;
	310	int i;
	311
	312	initialize_ll_merge();
	313
	314	if (ATTR_TRUE(merge_attr))
	315	return &ll_merge_drv[LL_TEXT_MERGE];
	316	else if (ATTR_FALSE(merge_attr))
	317	return &ll_merge_drv[LL_BINARY_MERGE];
	318	else if (ATTR_UNSET(merge_attr)) {
	319	if (!default_ll_merge)
	320	return &ll_merge_drv[LL_TEXT_MERGE];
	321	else
	322	name = default_ll_merge;
	323	}
	324	else
	325	name = merge_attr;
	326
	327	for (fn = ll_user_merge; fn; fn = fn->next)
	328	if (!strcmp(fn->name, name))
	329	return fn;
	330
	331	for (i = 0; i < ARRAY_SIZE(ll_merge_drv); i++)
	332	if (!strcmp(ll_merge_drv[i].name, name))
	333	return &ll_merge_drv[i];
	334
	335	/* default to the 3-way */
	336	return &ll_merge_drv[LL_TEXT_MERGE];
	337	}
	338
23a64c9e	339	static int git_path_check_merge(const char *path, struct git_attr_check check[2])
525ab639	340	{
23a64c9e JH	341	if (!check[0].attr) {
	342	check[0].attr = git_attr("merge");
	343	check[1].attr = git_attr("conflict-marker-size");
	344	}
d932f4eb	345	return git_check_attr(path, 2, check);
525ab639 JH	346	}
525ab639 JH	347
f217f0e8 EB	348	static void normalize_file(mmfile_t mm, const char path)
	349	{
	350	struct strbuf strbuf = STRBUF_INIT;
	351	if (renormalize_buffer(path, mm->ptr, mm->size, &strbuf)) {
	352	free(mm->ptr);
	353	mm->size = strbuf.len;
	354	mm->ptr = strbuf_detach(&strbuf, NULL);
	355	}
	356	}
	357
525ab639 JH	358	int ll_merge(mmbuffer_t *result_buf,
525ab639 JH	359	const char *path,
f01de62e	360	mmfile_t ancestor, const char ancestor_label,
525ab639 JH	361	mmfile_t ours, const char our_label,
525ab639 JH	362	mmfile_t theirs, const char their_label,
712516bc	363	const struct ll_merge_options *opts)
525ab639	364	{
23a64c9e	365	static struct git_attr_check check[2];
4fb40c2b	366	static const struct ll_merge_options default_opts;
23a64c9e JH	367	const char *ll_driver_name = NULL;
23a64c9e JH	368	int marker_size = DEFAULT_CONFLICT_MARKER_SIZE;
525ab639 JH	369	const struct ll_merge_driver *driver;
525ab639 JH	370
4fb40c2b JN	371	if (!opts)
4fb40c2b JN	372	opts = &default_opts;
712516bc JN	373
712516bc JN	374	if (opts->renormalize) {
f217f0e8 EB	375	normalize_file(ancestor, path);
	376	normalize_file(ours, path);
	377	normalize_file(theirs, path);
	378	}
23a64c9e JH	379	if (!git_path_check_merge(path, check)) {
	380	ll_driver_name = check[0].value;
	381	if (check[1].value) {
	382	marker_size = atoi(check[1].value);
	383	if (marker_size <= 0)
	384	marker_size = DEFAULT_CONFLICT_MARKER_SIZE;
	385	}
	386	}
525ab639	387	driver = find_ll_merge_driver(ll_driver_name);
712516bc	388	if (opts->virtual_ancestor && driver->recursive)
525ab639	389	driver = find_ll_merge_driver(driver->recursive);
f01de62e	390	return driver->fn(driver, result_buf, path, ancestor, ancestor_label,
23a64c9e	391	ours, our_label, theirs, their_label,
712516bc	392	opts, marker_size);
525ab639	393	}
8588567c JH	394
	395	int ll_merge_marker_size(const char *path)
	396	{
	397	static struct git_attr_check check;
	398	int marker_size = DEFAULT_CONFLICT_MARKER_SIZE;
	399
	400	if (!check.attr)
	401	check.attr = git_attr("conflict-marker-size");
d932f4eb	402	if (!git_check_attr(path, 1, &check) && check.value) {
8588567c JH	403	marker_size = atoi(check.value);
	404	if (marker_size <= 0)
	405	marker_size = DEFAULT_CONFLICT_MARKER_SIZE;
	406	}
	407	return marker_size;
525ab639	408	}