Show time since last change on index page

When creating the index page, an optional file can be scanned per repository
to obtain a timestamp for last modification within the repo. If such a file
cannot be found, st_mtime for repo.defbranch is used instead.

This information is then printed in a new column, "Idle", using the new
function cgit_print_age().

The new parameter "repo.agefile" can be used to specify (globally) a relative
path to scan (default value is "info/web/last-modified").

The content of the "last-modified" file can be generated by the post-receive
hook with a command like this:

	git-for-each-ref --format="%(committerdate)" --sort=-committerdate \
	--count=1 > $GIT_DIR/info/web/last-modified

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

ui-repolist.c

@@ -7,6 +7,41 @@
  */
 
 #include "cgit.h"
+#include <time.h>
+
+
+time_t read_agefile(char *path)
+{
+	FILE *f;
+	static char buf[64], buf2[64];
+	struct tm tm;
+
+	if (!(f = fopen(path, "r")))
+		return -1;
+	fgets(buf, sizeof(buf), f);
+	fclose(f);
+	if (parse_date(buf, buf2, sizeof(buf2)))
+		return strtoul(buf2, NULL, 10);
+	else
+		return 0;
+}
+
+static void print_modtime(struct repoinfo *repo)
+{
+	char *path;
+	struct stat s;
+
+	path = fmt("%s/%s", repo->path, cgit_agefile);
+	if (stat(path, &s) == 0) {
+		cgit_print_age(read_agefile(path), -1, NULL);
+		return;
+	}
+
+	path = fmt("%s/refs/heads/%s", repo->path, repo->defbranch);
+	if (stat(path, &s) != 0)
+		return;
+	cgit_print_age(s.st_mtime, -1, NULL);
+}
 
 void cgit_print_repolist(struct cacheitem *item)
 {
@@ -19,7 +54,7 @@ void cgit_print_repolist(struct cacheitem *item)
 
 	html("<table class='list nowrap'>");
 	if (cgit_index_header) {
-		html("<tr class='nohover'><td colspan='4' class='include-block'>");
+		html("<tr class='nohover'><td colspan='5' class='include-block'>");
 		html_include(cgit_index_header);
 		html("</td></tr>");
 	}
@@ -27,6 +62,7 @@ void cgit_print_repolist(struct cacheitem *item)
 	     "<th class='left'>Name</th>"
 	     "<th class='left'>Description</th>"
 	     "<th class='left'>Owner</th>"
+	     "<th class='left'>Idle</th>"
 	     "<th>Links</th></tr>\n");
 
 	for (i=0; i<cgit_repolist.count; i++) {
@@ -50,6 +86,8 @@ void cgit_print_repolist(struct cacheitem *item)
 		html("</td><td>");
 		html_txt(repo->owner);
 		html("</td><td>");
+		print_modtime(repo);
+		html("</td><td>");
 		html_link_open(cgit_repourl(repo->url),
 			       "Summary", "button");
 		html("S</a>");