builtin/name-rev.c - jrn/git - Git at Google

 #include "builtin.h"
 #include "cache.h"
 #include "commit.h"
 #include "tag.h"
 #include "refs.h"
 #include "parse-options.h"

 #define CUTOFF_DATE_SLOP 86400 /* one day */

 typedef struct rev_name {
 	const char *tip_name;
 	int generation;
 	int distance;
 } rev_name;

 static long cutoff = LONG_MAX;

 /* How many generations are maximally preferred over _one_ merge traversal? */
 #define MERGE_TRAVERSAL_WEIGHT 65535

 static void name_rev(struct commit *commit,
 		const char *tip_name, int generation, int distance,
 		int deref)
 {
 	struct rev_name *name = (struct rev_name *)commit->util;
 	struct commit_list *parents;
 	int parent_number = 1;

 	if (!commit->object.parsed)
 		parse_commit(commit);

 	if (commit->date < cutoff)
 		return;

 	if (deref) {
 		char *new_name = xmalloc(strlen(tip_name)+3);
 		strcpy(new_name, tip_name);
 		strcat(new_name, "^0");
 		tip_name = new_name;

 		if (generation)
 			die("generation: %d, but deref?", generation);
 	}

 	if (name == NULL) {
 		name = xmalloc(sizeof(rev_name));
 		commit->util = name;
 		goto copy_data;
 	} else if (name->distance > distance) {
 copy_data:
 		name->tip_name = tip_name;
 		name->generation = generation;
 		name->distance = distance;
 	} else
 		return;

 	for (parents = commit->parents;
 			parents;
 			parents = parents->next, parent_number++) {
 		if (parent_number > 1) {
 			int len = strlen(tip_name);
 			char *new_name = xmalloc(len +
 				1 + decimal_length(generation) +  /* ~<n> */
 				1 + 2 +				  /* ^NN */
 				1);

 			if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
 				len -= 2;
 			if (generation > 0)
 				sprintf(new_name, "%.*s~%d^%d", len, tip_name,
 						generation, parent_number);
 			else
 				sprintf(new_name, "%.*s^%d", len, tip_name,
 						parent_number);

 			name_rev(parents->item, new_name, 0,
 				distance + MERGE_TRAVERSAL_WEIGHT, 0);
 		} else {
 			name_rev(parents->item, tip_name, generation + 1,
 				distance + 1, 0);
 		}
 	}
 }

 struct name_ref_data {
 	int tags_only;
 	int name_only;
 	const char *ref_filter;
 };

 static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
 {
 	struct object *o = parse_object(sha1);
 	struct name_ref_data *data = cb_data;
 	int deref = 0;

 	if (data->tags_only && prefixcmp(path, "refs/tags/"))
 		return 0;

 	if (data->ref_filter && fnmatch(data->ref_filter, path, 0))
 		return 0;

 	while (o && o->type == OBJ_TAG) {
 		struct tag *t = (struct tag *) o;
 		if (!t->tagged)
 			break; /* broken repository */
 		o = parse_object(t->tagged->sha1);
 		deref = 1;
 	}
 	if (o && o->type == OBJ_COMMIT) {
 		struct commit *commit = (struct commit *)o;

 		if (!prefixcmp(path, "refs/heads/"))
 			path = path + 11;
 		else if (data->tags_only
 		    && data->name_only
 		    && !prefixcmp(path, "refs/tags/"))
 			path = path + 10;
 		else if (!prefixcmp(path, "refs/"))
 			path = path + 5;

 		name_rev(commit, xstrdup(path), 0, 0, deref);
 	}
 	return 0;
 }

 /* returns a static buffer */
 static const char *get_rev_name(const struct object *o)
 {
 	static char buffer[1024];
 	struct rev_name *n;
 	struct commit *c;

 	if (o->type != OBJ_COMMIT)
 		return NULL;
 	c = (struct commit *) o;
 	n = c->util;
 	if (!n)
 		return NULL;

 	if (!n->generation)
 		return n->tip_name;
 	else {
 		int len = strlen(n->tip_name);
 		if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 			len -= 2;
 		snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
 				n->generation);

 		return buffer;
 	}
 }

 static void show_name(const struct object *obj,
 		      const char *caller_name,
 		      int always, int allow_undefined, int name_only)
 {
 	const char *name;
 	const unsigned char *sha1 = obj->sha1;

 	if (!name_only)
 		printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
 	name = get_rev_name(obj);
 	if (name)
 		printf("%s\n", name);
 	else if (allow_undefined)
 		printf("undefined\n");
 	else if (always)
 		printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
 	else
 		die("cannot describe '%s'", sha1_to_hex(sha1));
 }

 static char const * const name_rev_usage[] = {
 	"git name-rev [options] ( --all | --stdin | <commit>... )",
 	NULL
 };

 static void name_rev_line(char *p, struct name_ref_data *data)
 {
 	int forty = 0;
 	char *p_start;
 	for (p_start = p; *p; p++) {
 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 		if (!ishex(*p))
 			forty = 0;
 		else if (++forty == 40 &&
 			 !ishex(*(p+1))) {
 			unsigned char sha1[40];
 			const char *name = NULL;
 			char c = *(p+1);
 			int p_len = p - p_start + 1;

 			forty = 0;

 			*(p+1) = 0;
 			if (!get_sha1(p - 39, sha1)) {
 				struct object *o =
 					lookup_object(sha1);
 				if (o)
 					name = get_rev_name(o);
 			}
 			*(p+1) = c;

 			if (!name)
 				continue;

 			if (data->name_only)
 				printf("%.*s%s", p_len - 40, p_start, name);
 			else
 				printf("%.*s (%s)", p_len, p_start, name);
 			p_start = p + 1;
 		}
 	}

 	/* flush */
 	if (p_start != p)
 		fwrite(p_start, p - p_start, 1, stdout);
 }

 int cmd_name_rev(int argc, const char **argv, const char *prefix)
 {
 	struct object_array revs = OBJECT_ARRAY_INIT;
 	int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
 	struct name_ref_data data = { 0, 0, NULL };
 	struct option opts[] = {
 		OPT_BOOLEAN(0, "name-only", &data.name_only, "print only names (no SHA-1)"),
 		OPT_BOOLEAN(0, "tags", &data.tags_only, "only use tags to name the commits"),
 		OPT_STRING(0, "refs", &data.ref_filter, "pattern",
 				   "only use refs matching <pattern>"),
 		OPT_GROUP(""),
 		OPT_BOOLEAN(0, "all", &all, "list all commits reachable from all refs"),
 		OPT_BOOLEAN(0, "stdin", &transform_stdin, "read from stdin"),
 		OPT_BOOLEAN(0, "undefined", &allow_undefined, "allow to print `undefined` names"),
 		OPT_BOOLEAN(0, "always",     &always,
 			   "show abbreviated commit object as fallback"),
 		OPT_END(),
 	};

 	git_config(git_default_config, NULL);
 	argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
 	if (!!all + !!transform_stdin + !!argc > 1) {
 		error("Specify either a list, or --all, not both!");
 		usage_with_options(name_rev_usage, opts);
 	}
 	if (all || transform_stdin)
 		cutoff = 0;

 	for (; argc; argc--, argv++) {
 		unsigned char sha1[20];
 		struct object *o;
 		struct commit *commit;

 		if (get_sha1(*argv, sha1)) {
 			fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 					*argv);
 			continue;
 		}

 		o = deref_tag(parse_object(sha1), *argv, 0);
 		if (!o || o->type != OBJ_COMMIT) {
 			fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 					*argv);
 			continue;
 		}

 		commit = (struct commit *)o;
 		if (cutoff > commit->date)
 			cutoff = commit->date;
 		add_object_array((struct object *)commit, *argv, &revs);
 	}

 	if (cutoff)
 		cutoff = cutoff - CUTOFF_DATE_SLOP;
 	for_each_ref(name_ref, &data);

 	if (transform_stdin) {
 		char buffer[2048];

 		while (!feof(stdin)) {
 			char *p = fgets(buffer, sizeof(buffer), stdin);
 			if (!p)
 				break;
 			name_rev_line(p, &data);
 		}
 	} else if (all) {
 		int i, max;

 		max = get_max_object_index();
 		for (i = 0; i < max; i++) {
 			struct object *obj = get_indexed_object(i);
 			if (!obj)
 				continue;
 			show_name(obj, NULL,
 				  always, allow_undefined, data.name_only);
 		}
 	} else {
 		int i;
 		for (i = 0; i < revs.nr; i++)
 			show_name(revs.objects[i].item, revs.objects[i].name,
 				  always, allow_undefined, data.name_only);
 	}

 	return 0;
 }
	#include "builtin.h"
	#include "cache.h"
	#include "commit.h"
	#include "tag.h"
	#include "refs.h"
	#include "parse-options.h"

	#define CUTOFF_DATE_SLOP 86400 /* one day */

	typedef struct rev_name {
	const char *tip_name;
	int generation;
	int distance;
	} rev_name;

	static long cutoff = LONG_MAX;

	/* How many generations are maximally preferred over _one_ merge traversal? */
	#define MERGE_TRAVERSAL_WEIGHT 65535

	static void name_rev(struct commit *commit,
	const char *tip_name, int generation, int distance,
	int deref)
	{
	struct rev_name name = (struct rev_name )commit->util;
	struct commit_list *parents;
	int parent_number = 1;

	if (!commit->object.parsed)
	parse_commit(commit);

	if (commit->date < cutoff)
	return;

	if (deref) {
	char *new_name = xmalloc(strlen(tip_name)+3);
	strcpy(new_name, tip_name);
	strcat(new_name, "^0");
	tip_name = new_name;

	if (generation)
	die("generation: %d, but deref?", generation);
	}

	if (name == NULL) {
	name = xmalloc(sizeof(rev_name));
	commit->util = name;
	goto copy_data;
	} else if (name->distance > distance) {
	copy_data:
	name->tip_name = tip_name;
	name->generation = generation;
	name->distance = distance;
	} else
	return;

	for (parents = commit->parents;
	parents;
	parents = parents->next, parent_number++) {
	if (parent_number > 1) {
	int len = strlen(tip_name);
	char *new_name = xmalloc(len +
	1 + decimal_length(generation) + /* ~<n> */
	1 + 2 + /* ^NN */
	1);

	if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
	len -= 2;
	if (generation > 0)
	sprintf(new_name, "%.*s~%d^%d", len, tip_name,
	generation, parent_number);
	else
	sprintf(new_name, "%.*s^%d", len, tip_name,
	parent_number);

	name_rev(parents->item, new_name, 0,
	distance + MERGE_TRAVERSAL_WEIGHT, 0);
	} else {
	name_rev(parents->item, tip_name, generation + 1,
	distance + 1, 0);
	}
	}
	}

	struct name_ref_data {
	int tags_only;
	int name_only;
	const char *ref_filter;
	};

	static int name_ref(const char path, const unsigned char sha1, int flags, void *cb_data)
	{
	struct object *o = parse_object(sha1);
	struct name_ref_data *data = cb_data;
	int deref = 0;

	if (data->tags_only && prefixcmp(path, "refs/tags/"))
	return 0;

	if (data->ref_filter && fnmatch(data->ref_filter, path, 0))
	return 0;

	while (o && o->type == OBJ_TAG) {
	struct tag t = (struct tag ) o;
	if (!t->tagged)
	break; /* broken repository */
	o = parse_object(t->tagged->sha1);
	deref = 1;
	}
	if (o && o->type == OBJ_COMMIT) {
	struct commit commit = (struct commit )o;

	if (!prefixcmp(path, "refs/heads/"))
	path = path + 11;
	else if (data->tags_only
	&& data->name_only
	&& !prefixcmp(path, "refs/tags/"))
	path = path + 10;
	else if (!prefixcmp(path, "refs/"))
	path = path + 5;

	name_rev(commit, xstrdup(path), 0, 0, deref);
	}
	return 0;
	}

	/* returns a static buffer */
	static const char get_rev_name(const struct object o)
	{
	static char buffer[1024];
	struct rev_name *n;
	struct commit *c;

	if (o->type != OBJ_COMMIT)
	return NULL;
	c = (struct commit *) o;
	n = c->util;
	if (!n)
	return NULL;

	if (!n->generation)
	return n->tip_name;
	else {
	int len = strlen(n->tip_name);
	if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
	len -= 2;
	snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
	n->generation);

	return buffer;
	}
	}

	static void show_name(const struct object *obj,
	const char *caller_name,
	int always, int allow_undefined, int name_only)
	{
	const char *name;
	const unsigned char *sha1 = obj->sha1;

	if (!name_only)
	printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
	name = get_rev_name(obj);
	if (name)
	printf("%s\n", name);
	else if (allow_undefined)
	printf("undefined\n");
	else if (always)
	printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
	else
	die("cannot describe '%s'", sha1_to_hex(sha1));
	}

	static char const * const name_rev_usage[] = {
	"git name-rev [options] ( --all \| --stdin \| <commit>... )",
	NULL
	};

	static void name_rev_line(char p, struct name_ref_data data)
	{
	int forty = 0;
	char *p_start;
	for (p_start = p; *p; p++) {
	#define ishex(x) (isdigit((x)) \|\| ((x) >= 'a' && (x) <= 'f'))
	if (!ishex(*p))
	forty = 0;
	else if (++forty == 40 &&
	!ishex(*(p+1))) {
	unsigned char sha1[40];
	const char *name = NULL;
	char c = *(p+1);
	int p_len = p - p_start + 1;

	forty = 0;

	*(p+1) = 0;
	if (!get_sha1(p - 39, sha1)) {
	struct object *o =
	lookup_object(sha1);
	if (o)
	name = get_rev_name(o);
	}
	*(p+1) = c;

	if (!name)
	continue;

	if (data->name_only)
	printf("%.*s%s", p_len - 40, p_start, name);
	else
	printf("%.*s (%s)", p_len, p_start, name);
	p_start = p + 1;
	}
	}

	/* flush */
	if (p_start != p)
	fwrite(p_start, p - p_start, 1, stdout);
	}

	int cmd_name_rev(int argc, const char *argv, const char prefix)
	{
	struct object_array revs = OBJECT_ARRAY_INIT;
	int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
	struct name_ref_data data = { 0, 0, NULL };
	struct option opts[] = {
	OPT_BOOLEAN(0, "name-only", &data.name_only, "print only names (no SHA-1)"),
	OPT_BOOLEAN(0, "tags", &data.tags_only, "only use tags to name the commits"),
	OPT_STRING(0, "refs", &data.ref_filter, "pattern",
	"only use refs matching <pattern>"),
	OPT_GROUP(""),
	OPT_BOOLEAN(0, "all", &all, "list all commits reachable from all refs"),
	OPT_BOOLEAN(0, "stdin", &transform_stdin, "read from stdin"),
	OPT_BOOLEAN(0, "undefined", &allow_undefined, "allow to print `undefined` names"),
	OPT_BOOLEAN(0, "always", &always,
	"show abbreviated commit object as fallback"),
	OPT_END(),
	};

	git_config(git_default_config, NULL);
	argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
	if (!!all + !!transform_stdin + !!argc > 1) {
	error("Specify either a list, or --all, not both!");
	usage_with_options(name_rev_usage, opts);
	}
	if (all \|\| transform_stdin)
	cutoff = 0;

	for (; argc; argc--, argv++) {
	unsigned char sha1[20];
	struct object *o;
	struct commit *commit;

	if (get_sha1(*argv, sha1)) {
	fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
	*argv);
	continue;
	}

	o = deref_tag(parse_object(sha1), *argv, 0);
	if (!o \|\| o->type != OBJ_COMMIT) {
	fprintf(stderr, "Could not get commit for %s. Skipping.\n",
	*argv);
	continue;
	}

	commit = (struct commit *)o;
	if (cutoff > commit->date)
	cutoff = commit->date;
	add_object_array((struct object )commit, argv, &revs);
	}

	if (cutoff)
	cutoff = cutoff - CUTOFF_DATE_SLOP;
	for_each_ref(name_ref, &data);

	if (transform_stdin) {
	char buffer[2048];

	while (!feof(stdin)) {
	char *p = fgets(buffer, sizeof(buffer), stdin);
	if (!p)
	break;
	name_rev_line(p, &data);
	}
	} else if (all) {
	int i, max;

	max = get_max_object_index();
	for (i = 0; i < max; i++) {
	struct object *obj = get_indexed_object(i);
	if (!obj)
	continue;
	show_name(obj, NULL,
	always, allow_undefined, data.name_only);
	}
	} else {
	int i;
	for (i = 0; i < revs.nr; i++)
	show_name(revs.objects[i].item, revs.objects[i].name,
	always, allow_undefined, data.name_only);
	}

	return 0;
	}