ui-log: color line changes

[cgit.git] / ui-shared.c

diff --git a/ui-shared.c b/ui-shared.c
index 562fa0ef055079dd136a6b7edf8a57a67dc9ccfa..b1a6c46be57f18576d3c1a57008029382f2417cb 100644 (file)
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -1069,18 +1069,34 @@ void cgit_print_filemode(unsigned short mode)
        html_fileperm(mode);
 }
 
+void cgit_compose_snapshot_prefix(struct strbuf *filename, const char *base,
+                                 const char *ref)
+{
+       unsigned char sha1[20];
+
+       /*
+        * Prettify snapshot names by stripping leading "v" or "V" if the tag
+        * name starts with {v,V}[0-9] and the prettify mapping is injective,
+        * i.e. each stripped tag can be inverted without ambiguities.
+        */
+       if (get_sha1(fmt("refs/tags/%s", ref), sha1) == 0 &&
+           (ref[0] == 'v' || ref[0] == 'V') && isdigit(ref[1]) &&
+           ((get_sha1(fmt("refs/tags/%s", ref + 1), sha1) == 0) +
+            (get_sha1(fmt("refs/tags/v%s", ref + 1), sha1) == 0) +
+            (get_sha1(fmt("refs/tags/V%s", ref + 1), sha1) == 0) == 1))
+               ref++;
+
+       strbuf_addf(filename, "%s-%s", base, ref);
+}
+
 void cgit_print_snapshot_links(const char *repo, const char *head,
                               const char *hex, int snapshots)
 {
        const struct cgit_snapshot_format* f;
        struct strbuf filename = STRBUF_INIT;
        size_t prefixlen;
-       unsigned char sha1[20];
 
-       if (get_sha1(fmt("refs/tags/%s", hex), sha1) == 0 &&
-           (hex[0] == 'v' || hex[0] == 'V') && isdigit(hex[1]))
-               hex++;
-       strbuf_addf(&filename, "%s-%s", cgit_repobasename(repo), hex);
+       cgit_compose_snapshot_prefix(&filename, cgit_repobasename(repo), hex);
        prefixlen = filename.len;
        for (f = cgit_snapshot_formats; f->suffix; f++) {
                if (!(snapshots & f->bit))