Add "snapshot-prefix" repo configuration

Allow using a user-specified value for the prefix in snapshot files
instead of the repository basename.  For example, files downloaded from
the linux-stable.git repository should be named linux-$VERSION and not
linux-stable-$VERSION, which can be achieved by setting:

	repo.snapshot-prefix=linux

Signed-off-by: John Keeping <john@keeping.me.uk>
Reviewed-by: Christian Hesse <mail@eworm.de>

cgit.c

@@ -79,6 +79,8 @@ static void repo_config(struct cgit_repo *repo, const char *name, const char *va
 		item->util = xstrdup(value);
 	} else if (!strcmp(name, "section"))
 		repo->section = xstrdup(value);
+	else if (!strcmp(name, "snapshot-prefix"))
+		repo->snapshot_prefix = xstrdup(value);
 	else if (!strcmp(name, "readme") && value != NULL) {
 		if (repo->readme.items == ctx.cfg.readme.items)
 			memset(&repo->readme, 0, sizeof(repo->readme));

cgit.h

@@ -88,6 +88,7 @@ struct cgit_repo {
 	char *clone_url;
 	char *logo;
 	char *logo_link;
+	char *snapshot_prefix;
 	int snapshots;
 	int enable_commit_graph;
 	int enable_log_filecount;

cgitrc.5.txt

@@ -599,6 +599,13 @@ repo.snapshots::
 	restricted by the global "snapshots" setting. Default value:
 	<snapshots>.
 
+repo.snapshot-prefix::
+	Prefix to use for snapshot links instead of the repository basename.
+	For example, the "linux-stable" repository may wish to set this to
+	"linux" so that snapshots are in the format "linux-3.15.4" instead
+	of "linux-stable-3.15.4".  Default value: <empty> meaning to use
+	the repository basename.
+
 repo.section::
 	Override the current section name for this repository. Default value:
 	none.

ui-refs.c

@@ -100,7 +100,7 @@ static void print_tag_downloads(const struct cgit_repo *repo, const char *ref)
 	if (!ref || strlen(ref) < 1)
 		return;
 
-	basename = cgit_repobasename(repo->url);
+	basename = cgit_snapshot_prefix(repo);
 	if (starts_with(ref, basename))
 		strbuf_addstr(&filename, ref);
 	else

ui-shared.c

@@ -152,6 +152,14 @@ const char *cgit_repobasename(const char *reponame)
 	return rvbuf;
 }
 
+const char *cgit_snapshot_prefix(const struct cgit_repo *repo)
+{
+	if (repo->snapshot_prefix)
+		return repo->snapshot_prefix;
+
+	return cgit_repobasename(repo->url);
+}
+
 static void site_url(const char *page, const char *search, const char *sort, int ofs, int always_root)
 {
 	char *delim = "?";
@@ -1110,7 +1118,7 @@ void cgit_print_snapshot_links(const struct cgit_repo *repo, const char *head,
 	struct strbuf filename = STRBUF_INIT;
 	size_t prefixlen;
 
-	cgit_compose_snapshot_prefix(&filename, cgit_repobasename(repo->url), hex);
+	cgit_compose_snapshot_prefix(&filename, cgit_snapshot_prefix(repo), hex);
 	prefixlen = filename.len;
 	for (f = cgit_snapshot_formats; f->suffix; f++) {
 		if (!(repo->snapshots & f->bit))

ui-shared.h

@@ -78,6 +78,7 @@ extern void cgit_compose_snapshot_prefix(struct strbuf *filename,
 					 const char *base, const char *ref);
 extern void cgit_print_snapshot_links(const struct cgit_repo *repo,
 				      const char *head, const char *hex);
+extern const char *cgit_snapshot_prefix(const struct cgit_repo *repo);
 extern void cgit_add_hidden_formfields(int incl_head, int incl_search,
 				       const char *page);
 

ui-snapshot.c

@@ -154,7 +154,7 @@ static const char *get_ref_from_filename(const struct cgit_repo *repo,
 	if (get_oid(snapshot.buf, &oid) == 0)
 		goto out;
 
-	reponame = cgit_repobasename(repo->url);
+	reponame = cgit_snapshot_prefix(repo);
 	if (starts_with(snapshot.buf, reponame)) {
 		const char *new_start = snapshot.buf;
 		new_start += strlen(reponame);
@@ -214,7 +214,7 @@ void cgit_print_snapshot(const char *head, const char *hex,
 		hex = head;
 
 	if (!prefix)
-		prefix = xstrdup(cgit_repobasename(ctx.repo->url));
+		prefix = xstrdup(cgit_snapshot_prefix(ctx.repo));
 
 	make_snapshot(f, hex, prefix, filename);
 	free(prefix);