introduce cgit_repobasename

that shortens reponame stripping any directories and .git suffixes, that is
 turning 'dir/repo.git/' or 'dir/repo/.git/' or alikes into mere 'repo'.

Signed-off-by: Michael Krelin <hacker@klever.net>

cgit.h

@@ -206,6 +206,8 @@ extern char *cgit_fileurl(const char *reponame, const char *pagename,
 extern char *cgit_pageurl(const char *reponame, const char *pagename,
 			  const char *query);
 
+extern const char *cgit_repobasename(const char *reponame);
+
 extern void cgit_tree_link(char *name, char *title, char *class, char *head,
 			   char *rev, char *path);
 extern void cgit_log_link(char *name, char *title, char *class, char *head,

ui-shared.c

@@ -81,6 +81,30 @@ char *cgit_pageurl(const char *reponame, const char *pagename,
 	return cgit_fileurl(reponame,pagename,0,query);
 }
 
+const char *cgit_repobasename(const char *reponame)
+{
+	/* I assume we don't need to store more than one repo basename */
+	static char rvbuf[1024];
+	int p;
+	const char *rv;
+	strncpy(rvbuf,reponame,sizeof(rvbuf));
+	if(rvbuf[sizeof(rvbuf)-1])
+		die("cgit_repobasename: truncated repository name '%s'", reponame);
+	p = strlen(rvbuf)-1;
+	/* strip trailing slashes */
+	while(p && rvbuf[p]=='/') rvbuf[p--]=0;
+	/* strip trailing .git */
+	if(p>=3 && !strncmp(&rvbuf[p-3],".git",4)) {
+		p -= 3; rvbuf[p--] = 0;
+	}
+	/* strip more trailing slashes if any */
+	while( p && rvbuf[p]=='/') rvbuf[p--]=0;
+	/* find last slash in the remaining string */
+	rv = strrchr(rvbuf,'/');
+	if(rv)
+		return ++rv;
+	return rvbuf;
+}
 
 char *cgit_currurl()
 {