ui-tree.c: add support for path-selected submodule links

The current 'repo.module-link' option is sufficient when all gitlinks
in a repository can be converted to commit links in a uniform way, but
not when different submodules/paths needs different settings.

This patch adds support for 'repo.module-link.<path>', which will be
used for linking to submodules at paths matching one such entry.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

7 files changed, 78 insertions, 10 deletions

diff --git a/cgit.c b/cgit.c
index 51ca78a..2118675 100644
--- a/cgit.c
+++ b/cgit.c
@@ -60,6 +60,8 @@ static void process_cached_repolist(const char *path);
 
 void repo_config(struct cgit_repo *repo, const char *name, const char *value)
 {
+	struct string_list_item *item;
+
 	if (!strcmp(name, "name"))
 		repo->name = xstrdup(value);
 	else if (!strcmp(name, "clone-url"))
@@ -86,7 +88,10 @@ void repo_config(struct cgit_repo *repo, const char *name, const char *value)
 		repo->max_stats = cgit_find_stats_period(value, NULL);
 	else if (!strcmp(name, "module-link"))
 		repo->module_link= xstrdup(value);
-	else if (!strcmp(name, "section"))
+	else if (!prefixcmp(name, "module-link.")) {
+		item = string_list_append(&repo->submodules, name + 12);
+		item->util = xstrdup(value);
+	} else if (!strcmp(name, "section"))
 		repo->section = xstrdup(value);
 	else if (!strcmp(name, "readme") && value != NULL)
 		repo->readme = xstrdup(value);
@@ -465,6 +470,7 @@ static int prepare_repo_cmd(struct cgit_context *ctx)
 		cgit_print_docend();
 		return 1;
 	}
+	sort_string_list(&ctx->repo->submodules);
 	cgit_prepare_repo_env(ctx->repo);
 	return 0;
 }
diff --git a/cgit.h b/cgit.h
index bad66f0..9d0b3d0 100644
--- a/cgit.h
+++ b/cgit.h
@@ -88,6 +88,7 @@ struct cgit_repo {
 	struct cgit_filter *about_filter;
 	struct cgit_filter *commit_filter;
 	struct cgit_filter *source_filter;
+	struct string_list submodules;
 };
 
 typedef void (*repo_config_fn)(struct cgit_repo *repo, const char *name,
diff --git a/cgitrc.5.txt b/cgitrc.5.txt
index 4721c1e..1162bd5 100644
--- a/cgitrc.5.txt
+++ b/cgitrc.5.txt
@@ -417,6 +417,12 @@ repo.module-link::
 	formatstring are the path and SHA1 of the submodule commit. Default
 	value: <module-link>
 
+repo.module-link.<path>::
+	Text which will be used as the formatstring for a hyperlink when a
+	submodule with the specified subdirectory path is printed in a
+	directory listing. The only argument for the formatstring is the SHA1
+	of the submodule commit. Default value: none.
+
 repo.max-stats::
 	Override the default maximum statistics period. Valid values are equal
 	to the values specified for the global "max-stats" setting. Default
diff --git a/shared.c b/shared.c
index 699c362..0add2e5 100644
--- a/shared.c
+++ b/shared.c
@@ -71,6 +71,7 @@ struct cgit_repo *cgit_add_repo(const char *url)
 	ret->commit_filter = ctx.cfg.commit_filter;
 	ret->source_filter = ctx.cfg.source_filter;
 	ret->clone_url = ctx.cfg.clone_url;
+	ret->submodules.strdup_strings = 1;
 	return ret;
 }
 
diff --git a/ui-shared.c b/ui-shared.c
index 5aa9119..b736fca 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -503,6 +503,62 @@ void cgit_object_link(struct object *obj)
 	reporevlink(page, name, NULL, NULL, ctx.qry.head, fullrev, NULL);
 }
 
+struct string_list_item *lookup_path(struct string_list *list,
+				     const char *path)
+{
+	struct string_list_item *item;
+
+	while (path && path[0]) {
+		if ((item = string_list_lookup(list, path)))
+			return item;
+		if (!(path = strchr(path, '/')))
+			break;
+		path++;
+	}
+	return NULL;
+}
+
+void cgit_submodule_link(const char *class, char *path, const char *rev)
+{
+	struct string_list *list;
+	struct string_list_item *item;
+	char tail, *dir;
+	size_t len;
+
+	tail = 0;
+	list = &ctx.repo->submodules;
+	item = lookup_path(list, path);
+	if (!item) {
+		len = strlen(path);
+		tail = path[len - 1];
+		if (tail == '/') {
+			path[len - 1] = 0;
+			item = lookup_path(list, path);
+		}
+	}
+	html("<a ");
+	if (class)
+		htmlf("class='%s' ", class);
+	html("href='");
+	if (item) {
+		html_attr(fmt(item->util, rev));
+	} else if (ctx.repo->module_link) {
+		dir = strrchr(path, '/');
+		if (dir)
+			dir++;
+		else
+			dir = path;
+		html_attr(fmt(ctx.repo->module_link, dir, rev));
+	} else {
+		html("#");
+	}
+	html("'>");
+	html_txt(path);
+	html("</a>");
+	if (item && tail)
+		path[len - 1] = tail;
+}
+
 void cgit_print_date(time_t secs, const char *format, int local_time)
 {
 	char buf[64];
diff --git a/ui-shared.h b/ui-shared.h
index 3cc1258..e80b975 100644
--- a/ui-shared.h
+++ b/ui-shared.h
@@ -51,6 +51,9 @@ extern void cgit_self_link(char *name, const char *title,
 			   const char *class, struct cgit_context *ctx);
 extern void cgit_object_link(struct object *obj);
 
+extern void cgit_submodule_link(const char *class, char *path,
+				const char *rev);
+
 extern void cgit_print_error(const char *msg);
 extern void cgit_print_date(time_t secs, const char *format, int local_time);
 extern void cgit_print_age(time_t t, time_t max_relative, const char *format);
diff --git a/ui-tree.c b/ui-tree.c
index 442b6be..b1adcc7 100644
--- a/ui-tree.c
+++ b/ui-tree.c
@@ -150,13 +150,7 @@ static int ls_item(const unsigned char *sha1, const char *base, int baselen,
 	cgit_print_filemode(mode);
 	html("</td><td>");
 	if (S_ISGITLINK(mode)) {
-		htmlf("<a class='ls-mod' href='");
-		html_attr(fmt(ctx.repo->module_link,
-			      name,
-			      sha1_to_hex(sha1)));
-		html("'>");
-		html_txt(name);
-		html("</a>");
+		cgit_submodule_link("ls-mod", fullpath, sha1_to_hex(sha1));
 	} else if (S_ISDIR(mode)) {
 		cgit_tree_link(name, NULL, "ls-dir", ctx.qry.head,
 			       curr_rev, fullpath);
@@ -177,8 +171,9 @@ static int ls_item(const unsigned char *sha1, const char *base, int baselen,
 	if (ctx.repo->max_stats)
 		cgit_stats_link("stats", NULL, "button", ctx.qry.head,
 				fullpath);
-	cgit_plain_link("plain", NULL, "button", ctx.qry.head, curr_rev,
-			fullpath);
+	if (!S_ISGITLINK(mode))
+		cgit_plain_link("plain", NULL, "button", ctx.qry.head, curr_rev,
+				fullpath);
 	html("</td></tr>\n");
 	free(name);
 	return 0;