X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=rev-parse.c;h=b82f294a78994e512c4f30da5bb4ba3eca3f95b4;hb=b992933853ccffac85f7e40310167ef7b8f0432e;hp=4bd58ebb67358b5640a7c89a24477c80c84ae7f4;hpb=80bd6f3064a6009cd18a4dab9ce6d29681cec4af;p=git.git

diff --git a/rev-parse.c b/rev-parse.c
index 4bd58ebb..b82f294a 100644
--- a/rev-parse.c
+++ b/rev-parse.c
@@ -6,22 +6,24 @@
 #include "cache.h"
 #include "commit.h"
 #include "refs.h"
+#include "quote.h"
+
+#define DO_REVS		1
+#define DO_NOREV	2
+#define DO_FLAGS	4
+#define DO_NONFLAGS	8
+static int filter = ~0;
 
 static char *def = NULL;
-static int no_revs = 0;
-static int single_rev = 0;
-static int revs_only = 0;
-static int do_rev_argument = 1;
-static int output_revs = 0;
-static int flags_only = 0;
-static int no_flags = 0;
-static int output_sq = 0;
 
 #define NORMAL 0
 #define REVERSED 1
 static int show_type = NORMAL;
+static int symbolic = 0;
+static int abbrev = 0;
+static int output_sq = 0;
 
-static int get_extended_sha1(char *name, unsigned char *sha1);
+static int revs_count = 0;
 
 /*
  * Some arguments are relevant "revision" arguments,
@@ -31,25 +33,43 @@ static int get_extended_sha1(char *name, unsigned char *sha1);
 static int is_rev_argument(const char *arg)
 {
 	static const char *rev_args[] = {
-		"--max-count=",
+		"--all",
+		"--bisect",
+		"--dense",
+		"--header",
 		"--max-age=",
-		"--min-age=",
+		"--max-count=",
 		"--merge-order",
+		"--min-age=",
+		"--no-merges",
+		"--objects",
+		"--parents",
+		"--pretty",
+		"--show-breaks",
+		"--sparse",
+		"--topo-order",
+		"--unpacked",
 		NULL
 	};
 	const char **p = rev_args;
 
+	/* accept -<digit>, like traditional "head" */
+	if ((*arg == '-') && isdigit(arg[1]))
+		return 1;
+
 	for (;;) {
 		const char *str = *p++;
 		int len;
 		if (!str)
 			return 0;
 		len = strlen(str);
-		if (!strncmp(arg, str, len))
+		if (!strcmp(arg, str) ||
+		    (str[len-1] == '=' && !strncmp(arg, str, len)))
 			return 1;
 	}
 }
 
+/* Output argument as a string, either SQ or normal */
 static void show(const char *arg)
 {
 	if (output_sq) {
@@ -68,262 +88,115 @@ static void show(const char *arg)
 		puts(arg);
 }
 
-static void show_rev(int type, const unsigned char *sha1)
+/* Output a revision, only if filter allows it */
+static void show_rev(int type, const unsigned char *sha1, const char *name)
 {
-	if (no_revs)
+	if (!(filter & DO_REVS))
 		return;
-	output_revs++;
+	def = NULL;
+	revs_count++;
 
-	/* Hexadecimal string plus possibly a carret;
-	 * this does not have to be quoted even under output_sq.
-	 */
-	printf("%s%s%c", type == show_type ? "" : "^", sha1_to_hex(sha1),
-	       output_sq ? ' ' : '\n');
-}
-
-static void show_rev_arg(char *rev)
-{
-	if (no_revs)
-		return;
-	show(rev);
-}
-
-static void show_norev(char *norev)
-{
-	if (flags_only)
-		return;
-	if (revs_only)
-		return;
-	show(norev);
-}
-
-static void show_arg(char *arg)
-{
-	if (no_flags)
-		return;
-	if (do_rev_argument && is_rev_argument(arg))
-		show_rev_arg(arg);
+	if (type != show_type)
+		putchar('^');
+	if (symbolic && name)
+		show(name);
+	else if (abbrev)
+		show(find_unique_abbrev(sha1, abbrev));
 	else
-		show_norev(arg);
+		show(sha1_to_hex(sha1));
 }
 
-static int get_parent(char *name, unsigned char *result, int idx)
+/* Output a flag, only if filter allows it. */
+static int show_flag(char *arg)
 {
-	unsigned char sha1[20];
-	int ret = get_extended_sha1(name, sha1);
-	struct commit *commit;
-	struct commit_list *p;
-
-	if (ret)
-		return ret;
-	commit = lookup_commit_reference(sha1);
-	if (!commit)
-		return -1;
-	if (parse_commit(commit))
-		return -1;
-	if (!idx) {
-		memcpy(result, commit->object.sha1, 20);
+	if (!(filter & DO_FLAGS))
 		return 0;
+	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
+		show(arg);
+		return 1;
 	}
-	p = commit->parents;
-	while (p) {
-		if (!--idx) {
-			memcpy(result, p->item->object.sha1, 20);
-			return 0;
-		}
-		p = p->next;
-	}
-	return -1;
-}
-
-static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
-{
-	static char dirname[PATH_MAX];
-	char hex[40];
-	DIR *dir;
-	int found;
-
-	snprintf(dirname, sizeof(dirname), "%s/%.2s", get_object_directory(), name);
-	dir = opendir(dirname);
-	sprintf(hex, "%.2s", name);
-	found = 0;
-	if (dir) {
-		struct dirent *de;
-		while ((de = readdir(dir)) != NULL) {
-			if (strlen(de->d_name) != 38)
-				continue;
-			if (memcmp(de->d_name, name + 2, len-2))
-				continue;
-			memcpy(hex + 2, de->d_name, 38);
-			if (++found > 1)
-				break;
-		}
-		closedir(dir);
-	}
-	if (found == 1)
-		return get_sha1_hex(hex, sha1) == 0;
 	return 0;
 }
 
-static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
-{
-	do {
-		if (*a != *b)
-			return 0;
-		a++;
-		b++;
-		len -= 2;
-	} while (len > 1);
-	if (len)
-		if ((*a ^ *b) & 0xf0)
-			return 0;
-	return 1;
-}
-
-static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
+static void show_default(void)
 {
-	struct packed_git *p;
+	char *s = def;
 
-	prepare_packed_git();
-	for (p = packed_git; p; p = p->next) {
-		unsigned num = num_packed_objects(p);
-		unsigned first = 0, last = num;
-		while (first < last) {
-			unsigned mid = (first + last) / 2;
-			unsigned char now[20];
-			int cmp;
+	if (s) {
+		unsigned char sha1[20];
 
-			nth_packed_object_sha1(p, mid, now);
-			cmp = memcmp(match, now, 20);
-			if (!cmp) {
-				first = mid;
-				break;
-			}
-			if (cmp > 0) {
-				first = mid+1;
-				continue;
-			}
-			last = mid;
+		def = NULL;
+		if (!get_sha1(s, sha1)) {
+			show_rev(NORMAL, sha1, s);
+			return;
 		}
-		if (first < num) {
-			unsigned char now[20], next[20];
-			nth_packed_object_sha1(p, first, now);
-			if (match_sha(len, match, now)) {
-				if (nth_packed_object_sha1(p, first+1, next) || !match_sha(len, match, next)) {
-					memcpy(sha1, now, 20);
-					return 1;
-				}
-			}
-		}	
 	}
-	return 0;
 }
 
-static int get_short_sha1(char *name, unsigned char *sha1)
+static int show_reference(const char *refname, const unsigned char *sha1)
 {
-	int i;
-	char canonical[40];
-	unsigned char res[20];
-
-	memset(res, 0, 20);
-	memset(canonical, 'x', 40);
-	for (i = 0;;i++) {
-		unsigned char c = name[i];
-		unsigned char val;
-		if (!c || i > 40)
-			break;
-		if (c >= '0' && c <= '9')
-			val = c - '0';
-		else if (c >= 'a' && c <= 'f')
-			val = c - 'a' + 10;
-		else if (c >= 'A' && c <='F') {
-			val = c - 'A' + 10;
-			c -= 'A' - 'a';
-		}
-		else
-			return -1;
-		canonical[i] = c;
-		if (!(i & 1))
-			val <<= 4;
-		res[i >> 1] |= val;
-	}
-	if (i < 4)
-		return -1;
-	if (find_short_object_filename(i, canonical, sha1))
-		return 0;
-	if (find_short_packed_object(i, res, sha1))
-		return 0;
-	return -1;
+	show_rev(NORMAL, sha1, refname);
+	return 0;
 }
 
-/*
- * This is like "get_sha1()", except it allows "sha1 expressions",
- * notably "xyz^" for "parent of xyz"
- */
-static int get_extended_sha1(char *name, unsigned char *sha1)
+static void show_datestring(const char *flag, const char *datestr)
 {
-	int parent, ret;
-	int len = strlen(name);
+	static char buffer[100];
 
-	parent = 1;
-	if (len > 2 && name[len-1] >= '0' && name[len-1] <= '9') {
-		parent = name[len-1] - '0';
-		len--;
-	}
-	if (len > 1 && name[len-1] == '^') {
-		name[len-1] = 0;
-		ret = get_parent(name, sha1, parent);
-		name[len-1] = '^';
-		if (!ret)
-			return 0;
-	}
-	ret = get_sha1(name, sha1);
-	if (!ret)
-		return 0;
-	return get_short_sha1(name, sha1);
+	/* date handling requires both flags and revs */
+	if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
+		return;
+	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
+	show(buffer);
 }
 
-static void show_default(void)
+static int show_file(const char *arg)
 {
-	char *s = def;
-
-	if (s) {
-		unsigned char sha1[20];
-
-		def = NULL;
-		if (!get_extended_sha1(s, sha1)) {
-			show_rev(NORMAL, sha1);
-			return;
-		}
-		show_arg(s);
+	show_default();
+	if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
+		show(arg);
+		return 1;
 	}
-}
-
-static int show_reference(const char *refname, const unsigned char *sha1)
-{
-	show_rev(NORMAL, sha1);
 	return 0;
 }
 
 int main(int argc, char **argv)
 {
-	int i, as_is = 0;
+	int i, as_is = 0, verify = 0;
 	unsigned char sha1[20];
-
+	const char *prefix = setup_git_directory();
+	
 	for (i = 1; i < argc; i++) {
+		struct stat st;
 		char *arg = argv[i];
 		char *dotdot;
 	
 		if (as_is) {
-			show_norev(arg);
+			show_file(arg);
+			continue;
+		}
+		if (!strcmp(arg,"-n")) {
+			if (++i >= argc)
+				die("-n requires an argument");
+			if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
+				show(arg);
+				show(argv[i]);
+			}
 			continue;
 		}
+		if (!strncmp(arg,"-n",2)) {
+			if ((filter & DO_FLAGS) && (filter & DO_REVS))
+				show(arg);
+			continue;
+		}
+
 		if (*arg == '-') {
 			if (!strcmp(arg, "--")) {
-				show_default();
-				if (revs_only)
-					break;
 				as_is = 1;
+				/* Pass on the "--" if we show anything but files.. */
+				if (filter & (DO_FLAGS | DO_REVS))
+					show_file(arg);
+				continue;
 			}
 			if (!strcmp(arg, "--default")) {
 				def = argv[i+1];
@@ -331,25 +204,37 @@ int main(int argc, char **argv)
 				continue;
 			}
 			if (!strcmp(arg, "--revs-only")) {
-				revs_only = 1;
+				filter &= ~DO_NOREV;
 				continue;
 			}
 			if (!strcmp(arg, "--no-revs")) {
-				no_revs = 1;
+				filter &= ~DO_REVS;
 				continue;
 			}
 			if (!strcmp(arg, "--flags")) {
-				flags_only = 1;
+				filter &= ~DO_NONFLAGS;
 				continue;
 			}
 			if (!strcmp(arg, "--no-flags")) {
-				no_flags = 1;
+				filter &= ~DO_FLAGS;
 				continue;
 			}
 			if (!strcmp(arg, "--verify")) {
-				revs_only = 1;
-				do_rev_argument = 0;
-				single_rev = 1;
+				filter &= ~(DO_FLAGS|DO_NOREV);
+				verify = 1;
+				continue;
+			}
+			if (!strcmp(arg, "--short") ||
+			    !strncmp(arg, "--short=", 9)) {
+				filter &= ~(DO_FLAGS|DO_NOREV);
+				verify = 1;
+				abbrev = DEFAULT_ABBREV;
+				if (arg[8] == '=')
+					abbrev = strtoul(arg + 9, NULL, 10);
+				if (abbrev < MINIMUM_ABBREV)
+					abbrev = MINIMUM_ABBREV;
+				else if (40 <= abbrev)
+					abbrev = 40;
 				continue;
 			}
 			if (!strcmp(arg, "--sq")) {
@@ -360,53 +245,103 @@ int main(int argc, char **argv)
 				show_type ^= REVERSED;
 				continue;
 			}
+			if (!strcmp(arg, "--symbolic")) {
+				symbolic = 1;
+				continue;
+			}
 			if (!strcmp(arg, "--all")) {
 				for_each_ref(show_reference);
 				continue;
 			}
-			show_arg(arg);
+			if (!strcmp(arg, "--show-prefix")) {
+				if (prefix)
+					puts(prefix);
+				continue;
+			}
+			if (!strcmp(arg, "--show-cdup")) {
+				const char *pfx = prefix;
+				while (pfx) {
+					pfx = strchr(pfx, '/');
+					if (pfx) {
+						pfx++;
+						printf("../");
+					}
+				}
+				putchar('\n');
+				continue;
+			}
+			if (!strcmp(arg, "--git-dir")) {
+				const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
+				static char cwd[PATH_MAX];
+				if (gitdir) {
+					puts(gitdir);
+					continue;
+				}
+				if (!prefix) {
+					puts(".git");
+					continue;
+				}
+				if (!getcwd(cwd, PATH_MAX))
+					die("unable to get current working directory");
+				printf("%s/.git\n", cwd);
+				continue;
+			}
+			if (!strncmp(arg, "--since=", 8)) {
+				show_datestring("--max-age=", arg+8);
+				continue;
+			}
+			if (!strncmp(arg, "--after=", 8)) {
+				show_datestring("--max-age=", arg+8);
+				continue;
+			}
+			if (!strncmp(arg, "--before=", 9)) {
+				show_datestring("--min-age=", arg+9);
+				continue;
+			}
+			if (!strncmp(arg, "--until=", 8)) {
+				show_datestring("--min-age=", arg+8);
+				continue;
+			}
+			if (show_flag(arg) && verify)
+				die("Needed a single revision");
 			continue;
 		}
+
+		/* Not a flag argument */
 		dotdot = strstr(arg, "..");
 		if (dotdot) {
 			unsigned char end[20];
 			char *n = dotdot+2;
 			*dotdot = 0;
-			if (!get_extended_sha1(arg, sha1)) {
+			if (!get_sha1(arg, sha1)) {
 				if (!*n)
 					n = "HEAD";
-				if (!get_extended_sha1(n, end)) {
-					if (no_revs)
-						continue;
-					def = NULL;
-					show_rev(NORMAL, end);
-					show_rev(REVERSED, sha1);
+				if (!get_sha1(n, end)) {
+					show_rev(NORMAL, end, n);
+					show_rev(REVERSED, sha1, arg);
 					continue;
 				}
 			}
 			*dotdot = '.';
 		}
-		if (!get_extended_sha1(arg, sha1)) {
-			if (no_revs)
-				continue;
-			def = NULL;
-			show_rev(NORMAL, sha1);
+		if (!get_sha1(arg, sha1)) {
+			show_rev(NORMAL, sha1, arg);
 			continue;
 		}
-		if (*arg == '^' && !get_extended_sha1(arg+1, sha1)) {
-			if (no_revs)
-				continue;
-			def = NULL;
-			show_rev(REVERSED, sha1);
+		if (*arg == '^' && !get_sha1(arg+1, sha1)) {
+			show_rev(REVERSED, sha1, arg+1);
 			continue;
 		}
-		show_default();
-		show_norev(arg);
+		as_is = 1;
+		if (!show_file(arg))
+			continue;
+		if (verify)
+			die("Needed a single revision");
+		if (lstat(arg, &st) < 0)
+			die("'%s': %s", arg, strerror(errno));
 	}
 	show_default();
-	if (single_rev && output_revs != 1) {
-		fprintf(stderr, "Needed a single revision\n");
-		exit(1);
-	}
+	if (verify && revs_count != 1)
+		die("Needed a single revision");
 	return 0;
 }