Teach cgit howto include an external file on index page.

The new parameter index-header can be used to name an external file
which will be included verbatim at the top of the index page.

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

cgit.h

@@ -75,6 +75,7 @@ extern struct repoinfo *cgit_repo;
 extern char *cgit_root_title;
 extern char *cgit_css;
 extern char *cgit_logo;
+extern char *cgit_index_header;
 extern char *cgit_logo_link;
 extern char *cgit_module_link;
 extern char *cgit_virtual_root;

shared.c

@@ -14,6 +14,7 @@ struct repoinfo *cgit_repo;
 char *cgit_root_title   = "Git repository browser";
 char *cgit_css          = "/cgit.css";
 char *cgit_logo         = "/git-logo.png";
+char *cgit_index_header = NULL;
 char *cgit_logo_link    = "http://www.kernel.org/pub/software/scm/git/docs/";
 char *cgit_module_link  = "./?repo=%s&page=commit&id=%s";
 char *cgit_virtual_root = NULL;
@@ -101,6 +102,8 @@ void cgit_global_config_cb(const char *name, const char *value)
 		cgit_css = xstrdup(value);
 	else if (!strcmp(name, "logo"))
 		cgit_logo = xstrdup(value);
+	else if (!strcmp(name, "index-header"))
+		cgit_index_header = xstrdup(value);
 	else if (!strcmp(name, "logo-link"))
 		cgit_logo_link = xstrdup(value);
 	else if (!strcmp(name, "module-link"))

ui-repolist.c

@@ -17,6 +17,11 @@ void cgit_print_repolist(struct cacheitem *item)
 	cgit_print_pageheader(cgit_root_title, 0);
 
 	html("<table class='list nowrap'>");
+	if (cgit_index_header) {
+		html("<tr class='nohover'><td colspan='4' class='include-block'>");
+		html_include(cgit_index_header);
+		html("</td></tr>");
+	}
 	html("<tr class='nohover'>"
 	     "<th class='left'>Name</th>"
 	     "<th class='left'>Description</th>"