Add cgit_print_age() function

This function can be used to print relative dates, just as in gitweb. Next
step will be to actually use the new function.

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

cgit.css

@@ -388,3 +388,28 @@ td.toplevel-repo {
 table.list td.sublevel-repo {
 	padding-left: 1.5em;
 }
+
+span.age-mins {
+	font-weight: bold;
+	color: #080;
+}
+
+span.age-hours {
+	color: #080;
+}
+
+span.age-days {
+	color: #040;
+}
+
+span.age-weeks {
+	color: #444;
+}
+
+span.age-months {
+	color: #888;
+}
+
+span.age-years {
+	color: #bbb;
+}

cgit.h

@@ -29,6 +29,25 @@
 #define CMD_BLOB     6
 #define CMD_SNAPSHOT 7
 
+
+/*
+ * Dateformats used on misc. pages
+ */
+#define FMT_LONGDATE "%Y-%m-%d %H:%M:%S"
+#define FMT_SHORTDATE "%Y-%m-%d"
+
+
+/*
+ * Limits used for relative dates
+ */
+#define TM_MIN    60
+#define TM_HOUR  (TM_MIN * 60)
+#define TM_DAY   (TM_HOUR * 24)
+#define TM_WEEK  (TM_DAY * 7)
+#define TM_YEAR  (TM_DAY * 365)
+#define TM_MONTH (TM_YEAR / 12.0)
+
+
 typedef void (*configfn)(const char *name, const char *value);
 typedef void (*filepair_fn)(struct diff_filepair *pair);
 typedef void (*linediff_fn)(char *line, int len);
@@ -181,7 +200,8 @@ extern char *cgit_pageurl(const char *reponame, const char *pagename,
 			  const char *query);
 
 extern void cgit_print_error(char *msg);
-extern void cgit_print_date(unsigned long secs);
+extern void cgit_print_date(time_t secs, char *format);
+extern void cgit_print_age(time_t t, time_t max_relative, char *format);
 extern void cgit_print_docstart(char *title, struct cacheitem *item);
 extern void cgit_print_docend();
 extern void cgit_print_pageheader(char *title, int show_search);

ui-commit.c

@@ -172,14 +172,14 @@ void cgit_print_commit(const char *hex)
 	html(" ");
 	html_txt(info->author_email);
 	html("</td><td class='right'>");
-	cgit_print_date(info->author_date);
+	cgit_print_date(info->author_date, FMT_LONGDATE);
 	html("</td></tr>\n");
 	html("<tr><th>committer</th><td>");
 	html_txt(info->committer);
 	html(" ");
 	html_txt(info->committer_email);
 	html("</td><td class='right'>");
-	cgit_print_date(info->committer_date);
+	cgit_print_date(info->committer_date, FMT_LONGDATE);
 	html("</td></tr>\n");
 	html("<tr><th>tree</th><td colspan='2' class='sha1'><a href='");
 	query = fmt("h=%s&id=%s", sha1_to_hex(commit->object.sha1),

ui-shared.c

@@ -88,16 +88,57 @@ char *cgit_currurl()
 }
 
 
-void cgit_print_date(unsigned long secs)
+void cgit_print_date(time_t secs, char *format)
 {
-	char buf[32];
+	char buf[64];
 	struct tm *time;
 
 	time = gmtime(&secs);
-	strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", time);
+	strftime(buf, sizeof(buf)-1, format, time);
 	html_txt(buf);
 }
 
+void cgit_print_age(time_t t, time_t max_relative, char *format)
+{
+	time_t now, secs;
+
+	time(&now);
+	secs = now - t;
+
+	if (secs > max_relative && max_relative >= 0) {
+		cgit_print_date(t, format);
+		return;
+	}
+
+	if (secs < TM_HOUR * 2) {
+		htmlf("<span class='age-mins'>%.0f min.</span>",
+		      secs * 1.0 / TM_MIN);
+		return;
+	}
+	if (secs < TM_DAY * 2) {
+		htmlf("<span class='age-hours'>%.0f hours</span>",
+		      secs * 1.0 / TM_HOUR);
+		return;
+	}
+	if (secs < TM_WEEK * 2) {
+		htmlf("<span class='age-days'>%.0f days</span>",
+		      secs * 1.0 / TM_DAY);
+		return;
+	}
+	if (secs < TM_MONTH * 2) {
+		htmlf("<span class='age-weeks'>%.0f weeks</span>",
+		      secs * 1.0 / TM_WEEK);
+		return;
+	}
+	if (secs < TM_YEAR * 2) {
+		htmlf("<span class='age-months'>%.0f months</span>",
+		      secs * 1.0 / TM_MONTH);
+		return;
+	}
+	htmlf("<span class='age-years'>%.0f years</span>",
+	      secs * 1.0 / TM_YEAR);
+}
+
 void cgit_print_docstart(char *title, struct cacheitem *item)
 {
 	html("Content-Type: text/html; charset=utf-8\n");

ui-summary.c

@@ -28,7 +28,7 @@ static int cgit_print_branch_cb(const char *refname, const unsigned char *sha1,
 		html_txt(buf);
 		html_link_close();
 		html("</td><td>");
-		cgit_print_date(commit->date);
+		cgit_print_date(commit->date, FMT_LONGDATE);
 		html("</td><td>");
 		html_txt(info->author);
 		html("</td><td>");
@@ -108,7 +108,7 @@ static int cgit_print_tag_cb(const char *refname, const unsigned char *sha1,
 		html_link_close();
 		html("</td><td>");
 		if (info->tagger_date > 0)
-			cgit_print_date(info->tagger_date);
+			cgit_print_date(info->tagger_date, FMT_LONGDATE);
 		html("</td><td>");
 		if (info->tagger)
 			html(info->tagger);