scan-tree: Support gitweb.category.

Use gitweb.category from git config to determine repo's section, if
option is enabled.

cgit.c

@@ -340,6 +340,7 @@ static void prepare_context(struct cgit_context *ctx)
 	ctx->cfg.local_time = 0;
 	ctx->cfg.enable_gitweb_desc = 1;
 	ctx->cfg.enable_gitweb_owner = 1;
+	ctx->cfg.enable_gitweb_section = 1;
 	ctx->cfg.enable_http_clone = 1;
 	ctx->cfg.enable_tree_linenumbers = 1;
 	ctx->cfg.max_repo_count = 50;

cgit.h

@@ -200,6 +200,7 @@ struct cgit_config {
 	int enable_filter_overrides;
 	int enable_gitweb_owner;
 	int enable_gitweb_desc;
+	int enable_gitweb_section;
 	int enable_http_clone;
 	int enable_index_links;
 	int enable_commit_graph;

cgitrc.5.txt

@@ -118,6 +118,12 @@ enable-gitweb-owner::
 	for the git config value "gitweb.owner" to determine the owner.
 	Default value: "1". See also: scan-path.
 
+enable-gitweb-section::
+	If set to "1" and scan-path is enabled, we first check each repository
+	for the git config value "gitweb.category" to determine the repository's
+	section. This value is overridden if section-from-path is enabled.
+	Default value: "1". See also: scan-path section-from-path.
+
 enable-http-clone::
 	If set to "1", cgit will act as an dumb HTTP endpoint for git clones.
 	If you use an alternate way of serving git repositories, you may wish

scan-tree.c

@@ -49,6 +49,7 @@ struct cgit_repo *repo;
 repo_config_fn config_fn;
 char *owner;
 char *desc;
+char *section;
 
 static void repo_config(const char *name, const char *value)
 {
@@ -61,6 +62,8 @@ static int gitweb_config(const char *key, const char *value, void *cb)
 		owner = xstrdup(value);
 	else if (ctx.cfg.enable_gitweb_desc && !strcmp(key, "gitweb.description"))
 		desc = xstrdup(value);
+	else if (ctx.cfg.enable_gitweb_section && !strcmp(key, "gitweb.category"))
+		section = xstrdup(value);
 	return 0;
 }
 
@@ -95,6 +98,7 @@ static void add_repo(const char *base, const char *path, repo_config_fn fn)
 
 	owner = NULL;
 	desc = NULL;
+	section = NULL;
 	git_config_from_file(gitweb_config, fmt("%s/config", path), NULL);
 	
 	if (base == path)
@@ -137,6 +141,8 @@ static void add_repo(const char *base, const char *path, repo_config_fn fn)
 		if (!stat(p, &st))
 			repo->readme = "README.html";
 	}
+	if (section)
+		repo->section = section;
 	if (ctx.cfg.section_from_path) {
 		n  = ctx.cfg.section_from_path;
 		if (n > 0) {