X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=diff.c;h=17d68fa699f7c88aef8e6c1a0812575bfaec70e1;hb=a325957062b19b49ad75569c59771787c83c350d;hp=306bcd9807803f37dd742ff5c479c4875c454e03;hpb=4ae22d96fe9248dac4f26b1fc91154ba5e879799;p=git.git

diff --git a/diff.c b/diff.c
index 306bcd98..17d68fa6 100644
--- a/diff.c
+++ b/diff.c
@@ -13,6 +13,18 @@ static const char *diff_opts = "-pu";
 
 static int use_size_cache;
 
+int diff_rename_limit_default = -1;
+
+int git_diff_config(const char *var, const char *value)
+{
+	if (!strcmp(var, "diff.renamelimit")) {
+		diff_rename_limit_default = git_config_int(var, value);
+		return 0;
+	}
+
+	return git_default_config(var, value);
+}
+
 static char *quote_one(const char *str)
 {
 	int needlen;
@@ -492,9 +504,9 @@ static void prepare_temp_file(const char *name,
 		}
 		if (S_ISLNK(st.st_mode)) {
 			int ret;
-			char *buf, buf_[1024];
-			buf = ((sizeof(buf_) < st.st_size) ?
-			       xmalloc(st.st_size) : buf_);
+			char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
+			if (sizeof(buf) <= st.st_size)
+				die("symlink too long: %s", name);
 			ret = readlink(name, buf, st.st_size);
 			if (ret < 0)
 				die("readlink(%s)", name);
@@ -638,7 +650,7 @@ static void diff_fill_sha1_info(struct diff_filespec *one)
 	if (DIFF_FILE_VALID(one)) {
 		if (!one->sha1_valid) {
 			struct stat st;
-			if (stat(one->path, &st) < 0)
+			if (lstat(one->path, &st) < 0)
 				die("stat %s", one->path);
 			if (index_path(one->sha1, one->path, &st, 0))
 				die("cannot hash %s\n", one->path);
@@ -648,7 +660,7 @@ static void diff_fill_sha1_info(struct diff_filespec *one)
 		memset(one->sha1, 0, 20);
 }
 
-static void run_diff(struct diff_filepair *p)
+static void run_diff(struct diff_filepair *p, struct diff_options *o)
 {
 	const char *pgm = external_diff();
 	char msg[PATH_MAX*2+300], *xfrm_msg;
@@ -711,10 +723,12 @@ static void run_diff(struct diff_filepair *p)
 
 	if (memcmp(one->sha1, two->sha1, 20)) {
 		char one_sha1[41];
+		int abbrev = o->full_index ? 40 : DIFF_DEFAULT_INDEX_ABBREV;
 		memcpy(one_sha1, sha1_to_hex(one->sha1), 41);
 
 		len += snprintf(msg + len, sizeof(msg) - len,
-				"index %.7s..%.7s", one_sha1,
+				"index %.*s..%.*s",
+				abbrev, one_sha1, abbrev,
 				sha1_to_hex(two->sha1));
 		if (one->mode == two->mode)
 			len += snprintf(msg + len, sizeof(msg) - len,
@@ -754,25 +768,33 @@ void diff_setup(struct diff_options *options)
 	options->line_termination = '\n';
 	options->break_opt = -1;
 	options->rename_limit = -1;
+
+	options->change = diff_change;
+	options->add_remove = diff_addremove;
 }
 
 int diff_setup_done(struct diff_options *options)
 {
-	if ((options->find_copies_harder || 0 <= options->rename_limit) &&
-	    options->detect_rename != DIFF_DETECT_COPY)
+	if ((options->find_copies_harder &&
+	     options->detect_rename != DIFF_DETECT_COPY) ||
+	    (0 <= options->rename_limit && !options->detect_rename))
 		return -1;
+	if (options->detect_rename && options->rename_limit < 0)
+		options->rename_limit = diff_rename_limit_default;
 	if (options->setup & DIFF_SETUP_USE_CACHE) {
 		if (!active_cache)
 			/* read-cache does not die even when it fails
 			 * so it is safe for us to do this here.  Also
 			 * it does not smudge active_cache or active_nr
 			 * when it fails, so we do not have to worry about
-			 * cleaning it up oufselves either.
+			 * cleaning it up ourselves either.
 			 */
 			read_cache();
 	}
 	if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
 		use_size_cache = 1;
+	if (options->abbrev <= 0 || 40 < options->abbrev)
+		options->abbrev = 40; /* full */
 
 	return 0;
 }
@@ -786,6 +808,8 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 		options->line_termination = 0;
 	else if (!strncmp(arg, "-l", 2))
 		options->rename_limit = strtoul(arg+2, NULL, 10);
+	else if (!strcmp(arg, "--full-index"))
+		options->full_index = 1;
 	else if (!strcmp(arg, "--name-only"))
 		options->output_format = DIFF_FORMAT_NAME;
 	else if (!strcmp(arg, "--name-status"))
@@ -821,6 +845,10 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 	}
 	else if (!strcmp(arg, "--find-copies-harder"))
 		options->find_copies_harder = 1;
+	else if (!strcmp(arg, "--abbrev"))
+		options->abbrev = DIFF_DEFAULT_ABBREV;
+	else if (!strncmp(arg, "--abbrev=", 9))
+		options->abbrev = strtoul(arg + 9, NULL, 10);
 	else
 		return 0;
 	return 1;
@@ -828,16 +856,29 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 
 static int parse_num(const char **cp_p)
 {
-	int num, scale, ch, cnt;
+	unsigned long num, scale;
+	int ch, dot;
 	const char *cp = *cp_p;
 
-	cnt = num = 0;
+	num = 0;
 	scale = 1;
-	while ('0' <= (ch = *cp) && ch <= '9') {
-		if (cnt++ < 5) {
-			/* We simply ignore more than 5 digits precision. */
-			scale *= 10;
-			num = num * 10 + ch - '0';
+	dot = 0;
+	for(;;) {
+		ch = *cp;
+		if ( !dot && ch == '.' ) {
+			scale = 1;
+			dot = 1;
+		} else if ( ch == '%' ) {
+			scale = dot ? scale*100 : 100;
+			cp++;	/* % is always at the end */
+			break;
+		} else if ( ch >= '0' && ch <= '9' ) {
+			if ( scale < 100000 ) {
+				scale *= 10;
+				num = (num*10) + (ch-'0');
+			}
+		} else {
+			break;
 		}
 		cp++;
 	}
@@ -846,7 +887,7 @@ static int parse_num(const char **cp_p)
 	/* user says num divided by scale and we say internally that
 	 * is MAX_SCORE * num / scale.
 	 */
-	return (MAX_SCORE * num / scale);
+	return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
 }
 
 int diff_scoreopt_parse(const char *opt)
@@ -914,14 +955,49 @@ void diff_free_filepair(struct diff_filepair *p)
 	free(p);
 }
 
+/* This is different from find_unique_abbrev() in that
+ * it needs to deal with 0{40} SHA1.
+ */
+const char *diff_unique_abbrev(const unsigned char *sha1, int len)
+{
+	int abblen;
+	const char *abbrev;
+	if (len == 40)
+		return sha1_to_hex(sha1);
+
+	abbrev = find_unique_abbrev(sha1, len);
+	if (!abbrev) {
+		if (!memcmp(sha1, null_sha1, 20)) {
+			char *buf = sha1_to_hex(null_sha1);
+			if (len < 37)
+				strcpy(buf + len, "...");
+			return buf;
+		}
+		else 
+			return sha1_to_hex(sha1);
+	}
+	abblen = strlen(abbrev);
+	if (abblen < 37) {
+		static char hex[41];
+		if (len < abblen && abblen <= len + 2)
+			sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
+		else
+			sprintf(hex, "%s...", abbrev);
+		return hex;
+	}
+	return sha1_to_hex(sha1);
+}
+
 static void diff_flush_raw(struct diff_filepair *p,
 			   int line_termination,
 			   int inter_name_termination,
-			   int output_format)
+			   struct diff_options *options)
 {
 	int two_paths;
 	char status[10];
+	int abbrev = options->abbrev;
 	const char *path_one, *path_two;
+	int output_format = options->output_format;
 
 	path_one = p->one->path;
 	path_two = p->two->path;
@@ -952,8 +1028,10 @@ static void diff_flush_raw(struct diff_filepair *p,
 	}
 	if (output_format != DIFF_FORMAT_NAME_STATUS) {
 		printf(":%06o %06o %s ",
-		       p->one->mode, p->two->mode, sha1_to_hex(p->one->sha1));
-		printf("%s ", sha1_to_hex(p->two->sha1));
+		       p->one->mode, p->two->mode,
+		       diff_unique_abbrev(p->one->sha1, abbrev));
+		printf("%s ",
+		       diff_unique_abbrev(p->two->sha1, abbrev));
 	}
 	printf("%s%c%s", status, inter_name_termination, path_one);
 	if (two_paths)
@@ -1014,7 +1092,7 @@ int diff_unmodified_pair(struct diff_filepair *p)
 	return 0;
 }
 
-static void diff_flush_patch(struct diff_filepair *p)
+static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
 {
 	if (diff_unmodified_pair(p))
 		return;
@@ -1023,7 +1101,7 @@ static void diff_flush_patch(struct diff_filepair *p)
 	    (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
 		return; /* no tree diffs in patch format */ 
 
-	run_diff(p);
+	run_diff(p, o);
 }
 
 int diff_queue_is_empty(void)
@@ -1155,13 +1233,13 @@ void diff_flush(struct diff_options *options)
 			die("internal error in diff-resolve-rename-copy");
 		switch (diff_output_format) {
 		case DIFF_FORMAT_PATCH:
-			diff_flush_patch(p);
+			diff_flush_patch(p, options);
 			break;
 		case DIFF_FORMAT_RAW:
 		case DIFF_FORMAT_NAME_STATUS:
 			diff_flush_raw(p, line_termination,
 				       inter_name_termination,
-				       diff_output_format);
+				       options);
 			break;
 		case DIFF_FORMAT_NAME:
 			diff_flush_name(p,