Enable default value for head parameter

Pages which expect head to be specified in the querystring can now be
given a default value, configurable per repository (via repo.defbranch,
which defaults to "master").

Currently, only the log page actually works without parameters, but the
defbranch is bound to be exploited.

This also removes some dead code from shared.c

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

cgit.c

@@ -65,6 +65,9 @@ static void cgit_print_repo_page(struct cacheitem *item)
 	char *title;
 	int show_search;
 
+	if (!cgit_query_head)
+		cgit_query_head = cgit_repo->defbranch;
+
 	if (chdir(cgit_repo->path)) {
 		title = fmt("%s - %s", cgit_root_title, "Bad request");
 		cgit_print_docstart(title, item);

cgit.h

@@ -35,6 +35,7 @@ struct repoinfo {
 	char *path;
 	char *desc;
 	char *owner;
+	char *defbranch;
 	char *module_link;
 	int snapshots;
 };

shared.c

@@ -32,10 +32,6 @@ int cgit_cache_max_create_time =  5;
 int cgit_max_msg_len = 60;
 int cgit_max_commit_count = 50;
 
-char *cgit_repo_name    = NULL;
-char *cgit_repo_desc    = NULL;
-char *cgit_repo_owner   = NULL;
-
 int cgit_query_has_symref = 0;
 int cgit_query_has_sha1   = 0;
 
@@ -86,6 +82,7 @@ struct repoinfo *add_repo(const char *url)
 	ret->path = NULL;
 	ret->desc = NULL;
 	ret->owner = NULL;
+	ret->defbranch = "master";
 	ret->snapshots = cgit_snapshots;
 	ret->module_link = cgit_module_link;
 	return ret;
@@ -133,6 +130,8 @@ void cgit_global_config_cb(const char *name, const char *value)
 		cgit_repo->desc = xstrdup(value);
 	else if (cgit_repo && !strcmp(name, "repo.owner"))
 		cgit_repo->owner = xstrdup(value);
+	else if (cgit_repo && !strcmp(name, "repo.defbranch"))
+		cgit_repo->defbranch = xstrdup(value);
 	else if (cgit_repo && !strcmp(name, "repo.snapshots"))
 		cgit_repo->snapshots = atoi(value);
 	else if (cgit_repo && !strcmp(name, "repo.module-link"))
@@ -141,16 +140,6 @@ void cgit_global_config_cb(const char *name, const char *value)
 		cgit_read_config(value, cgit_global_config_cb);
 }
 
-void cgit_repo_config_cb(const char *name, const char *value)
-{
-	if (!strcmp(name, "name"))
-		cgit_repo_name = xstrdup(value);
-	else if (!strcmp(name, "desc"))
-		cgit_repo_desc = xstrdup(value);
-	else if (!strcmp(name, "owner"))
-		cgit_repo_owner = xstrdup(value);
-}
-
 void cgit_querystring_cb(const char *name, const char *value)
 {
 	if (!strcmp(name,"r")) {