tag: fix output of "tag -n" when errors occur

When "git tag" is instructed to print lines from annotated
tags via "-n", it first prints the tag name, then attempts
to parse and print the lines of the tag object, and then
finally adds a trailing newline.

If an error occurs, we return early from the function and
never print the newline, screwing up the output for the next
tag. Let's factor the line-printing into its own function so
we can manage the early returns better, and make sure that
we always terminate the line.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/tag.c b/builtin/tag.c
index 667515e5278d22548fb83507347ab652533a67b2..391160cf83338e1f18de5564cf1c0b2f78debefd 100644 (file)
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -84,18 +84,45 @@ static int contains(struct commit *candidate, const struct commit_list *want)
        return contains_recurse(candidate, want);
 }
 
+static void show_tag_lines(const unsigned char *sha1, int lines)
+{
+       int i;
+       unsigned long size;
+       enum object_type type;
+       char *buf, *sp, *eol;
+       size_t len;
+
+       buf = read_sha1_file(sha1, &type, &size);
+       if (!buf || !size)
+               return;
+
+       /* skip header */
+       sp = strstr(buf, "\n\n");
+       if (!sp) {
+               free(buf);
+               return;
+       }
+       /* only take up to "lines" lines, and strip the signature */
+       size = parse_signature(buf, size);
+       for (i = 0, sp += 2; i < lines && sp < buf + size; i++) {
+               if (i)
+                       printf("\n    ");
+               eol = memchr(sp, '\n', size - (sp - buf));
+               len = eol ? eol - sp : size - (sp - buf);
+               fwrite(sp, len, 1, stdout);
+               if (!eol)
+                       break;
+               sp = eol + 1;
+       }
+       free(buf);
+}
+
 static int show_reference(const char *refname, const unsigned char *sha1,
                          int flag, void *cb_data)
 {
        struct tag_filter *filter = cb_data;
 
        if (match_pattern(filter->patterns, refname)) {
-               int i;
-               unsigned long size;
-               enum object_type type;
-               char *buf, *sp, *eol;
-               size_t len;
-
                if (filter->with_commit) {
                        struct commit *commit;
 
@@ -111,33 +138,8 @@ static int show_reference(const char *refname, const unsigned char *sha1,
                        return 0;
                }
                printf("%-15s ", refname);
-
-               buf = read_sha1_file(sha1, &type, &size);
-               if (!buf || !size)
-                       return 0;
-
-               /* skip header */
-               sp = strstr(buf, "\n\n");
-               if (!sp) {
-                       free(buf);
-                       return 0;
-               }
-               /* only take up to "lines" lines, and strip the signature */
-               size = parse_signature(buf, size);
-               for (i = 0, sp += 2;
-                               i < filter->lines && sp < buf + size;
-                               i++) {
-                       if (i)
-                               printf("\n    ");
-                       eol = memchr(sp, '\n', size - (sp - buf));
-                       len = eol ? eol - sp : size - (sp - buf);
-                       fwrite(sp, len, 1, stdout);
-                       if (!eol)
-                               break;
-                       sp = eol + 1;
-               }
+               show_tag_lines(sha1, filter->lines);
                putchar('\n');
-               free(buf);
        }
 
        return 0;