[PATCH] cgit.css: add dynamic age update

[Andy Green]

This patch updates the emitted "ages" dynamically on the client side.

After updating on completion of the document load, it sets a timer
to update according to the smallest age it found.  If there are any
ages listed in minutes, then it will update again in 10s (this can
never happen more than twelve times on a given page then).  When the
most recent age is in hours, it updates every 5m.  If days, then
every 30m and so on.

This keeps the cost of the dynamic updates at worst once per 10s
and trending towards being trivially cheap after a couple of minutes.
The updates are done entirely on the client side without contact
with the server.

To make this work reliably, since parsing datetimes is unreliable in
browser js, the unix time is added as an attribute to all age spans.

To make that reliable cross-platform, the unix time is treated as a
uint64_t when it is formatted for printing.

The rules for display conversion of the age is aligned with the
existing server-side rules in ui-shared.h.

If the client or server-side time are not synchronized by ntpd etc,
ages shown on the client will not relate to the original ages computed
at the server.  The client updates the ages immediately when the
DOM has finished loading, so in the case the times at the server and
client are not aligned, this patch changes what the user sees on the
page to reflect patch age compared to client time.

If the server and client clocks are aligned, this patch makes no
difference to what is seen on the page.

Signed-off-by: Andy Green <andy at warmcat.com>
---
 cgit.h      |    1 +
 cgit.js     |   58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 ui-shared.c |    2 +-
 3 files changed, 60 insertions(+), 1 deletion(-)

diff --git a/cgit.h b/cgit.h
index 2579ce4..9b21919 100644
--- a/cgit.h
+++ b/cgit.h
@@ -24,6 +24,7 @@
 #include <utf8.h>
 #include <notes.h>
 #include <graph.h>
+#include <inttypes.h>
 
 /* Add isgraph(x) to Git's sane ctype support (see git-compat-util.h) */
 #undef isgraph
diff --git a/cgit.js b/cgit.js
index e2c3799..e13faf2 100644
--- a/cgit.js
+++ b/cgit.js
@@ -145,6 +145,61 @@ function cgit_line_range_click(e) {
 	cgit_copy_clipboard(cp);
 }
 
+/* this follows the logic and suffixes used in ui-shared.c */
+
+var cgit_age_classes = [ "age-mins", "age-hours", "age-days",    "age-weeks",    "age-months",    "age-years" ];
+var cgit_age_suffix =  [ "min.",     "hours",     "days",        "weeks",        "months",        "years",         "years" ];
+var cgit_age_next =    [ 60,         3600,        24 * 3600,     7 * 24 * 3600,  30 * 24 * 3600,  365 * 24 * 3600, 365 * 24 * 3600 ];
+var cgit_age_limit =   [ 7200,       24 * 7200,   7 * 24 * 7200, 30 * 24 * 7200, 365 * 25 * 7200, 365 * 25 * 7200 ];
+var cgit_update_next = [ 10,         5 * 60,      1800,          24 * 3600,      24 * 3600,       24 * 3600,       24 * 3600 ];
+
+function cgit_render_age(e, age)
+{
+	var t, n;
+
+	for (n = 0; n < cgit_age_classes.length; n++)
+		if (age < cgit_age_limit[n])
+			break;
+
+	t = Math.round(age / cgit_age_next[n]) + " " + cgit_age_suffix[n];
+
+	if (e.textContent != t) {
+		e.textContent = t;
+		if (n == cgit_age_classes.length)
+			n--;
+		if (e.className != cgit_age_classes[n])
+			e.className = cgit_age_classes[n];
+	}
+}
+
+function cgit_aging()
+{
+	var n, next = 24 * 3600,
+	    now_ut = Math.round((new Date().getTime() / 1000));
+
+	for (n = 0; n < cgit_age_classes.length; n++) {
+		var m, elems = document.getElementsByClassName(cgit_age_classes[n]);
+
+		if (elems.length && cgit_update_next[n] < next)
+			next = cgit_update_next[n];
+
+		for (m = 0; m < elems.length; m++) {
+			var age = now_ut - elems[m].getAttribute("ut");
+
+			cgit_render_age(elems[m], age);
+		}
+	}
+
+	/*
+	 * We only need to come back when the age might have changed.
+	 * Eg, if everything is counted in hours already, once per
+	 * 5 minutes is accurate enough.
+	 */
+
+	window.setTimeout(cgit_aging, next * 1000);
+}
+
+
 /* line range highlight */
 
 document.addEventListener("DOMContentLoaded", function() {
@@ -152,6 +207,9 @@ document.addEventListener("DOMContentLoaded", function() {
 	var e = document.getElementById("linenumber_td");
 	if (e)
 		e.addEventListener("click", cgit_line_range_click, true);
+
+	cgit_aging();
+
 }, false);
 window.addEventListener("hashchange", function() {
 	cgit_line_range_highlight();
diff --git a/ui-shared.c b/ui-shared.c
index 836c590..8567c06 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -670,7 +670,7 @@ const struct date_mode *cgit_date_mode(enum date_mode_type type)
 static void print_rel_date(time_t t, int tz, double value,
 	const char *class, const char *suffix)
 {
-	htmlf("<span class='%s' title='", class);
+	htmlf("<span class='%s' ut='%" PRIu64 "' title='", class, (uint64_t)t);
 	html_attr(show_date(t, tz, cgit_date_mode(DATE_ISO8601)));
 	htmlf("'>%.0f %s</span>", value, suffix);
 }