Relative timestamps in git log

I noticed that I was looking at the kernel gitweb output at some point
rather than just do "git log", simply because I liked seeing the
simplified date-format, ie the "5 days ago" rather than a full date.

This adds infrastructure to do that for "git log" too. It does NOT add the
actual flag to enable it, though, so right now this patch is a no-op, but
it should now be easy to add a command line flag (and possibly a config
file option) to just turn on the "relative" date format.

The exact cut-off points when it switches from days to weeks etc are
totally arbitrary, but are picked somewhat to avoid the "1 weeks ago"
thing (by making it show "10 days ago" rather than "1 week", or "70
minutes ago" rather than "1 hour ago").

[jc: with minor fix and tweak around "month" and "week" area.]

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/builtin-cat-file.c b/builtin-cat-file.c
index 7a6fa56e93034f0553e5a119180b3841cc773cb4..6c16bfa1ae4ae6207a74a8caa95564c649c4b0dd 100644 (file)
--- a/builtin-cat-file.c
+++ b/builtin-cat-file.c
@@ -54,7 +54,7 @@ static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long
                                        write_or_die(1, tagger, sp - tagger);
                                        date = strtoul(sp, &ep, 10);
                                        tz = strtol(ep, NULL, 10);
-                                       sp = show_date(date, tz);
+                                       sp = show_date(date, tz, 0);
                                        write_or_die(1, sp, strlen(sp));
                                        xwrite(1, "\n", 1);
                                        break;

diff --git a/cache.h b/cache.h
index 1f212d77a4e41009c88c4b599022295b8a12a609..ccb83a1fd5ccf9fe38e154b93b436e0021a91be6 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -286,7 +286,7 @@ extern void *read_object_with_reference(const unsigned char *sha1,
                                        unsigned long *size,
                                        unsigned char *sha1_ret);
 
-const char *show_date(unsigned long time, int timezone);
+const char *show_date(unsigned long time, int timezone, int relative);
 const char *show_rfc2822_date(unsigned long time, int timezone);
 int parse_date(const char *date, char *buf, int bufsize);
 void datestamp(char *buf, int bufsize);

diff --git a/commit.c b/commit.c
index 00bc3de22eb670c07e78087d96d9a3cff1d0fd67..c3ff9b4175c00a600ae25f9dc90eb521d7053719 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -507,14 +507,14 @@ static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const c
        }
        switch (fmt) {
        case CMIT_FMT_MEDIUM:
-               ret += sprintf(buf + ret, "Date:   %s\n", show_date(time, tz));
+               ret += sprintf(buf + ret, "Date:   %s\n", show_date(time, tz, 0));
                break;
        case CMIT_FMT_EMAIL:
                ret += sprintf(buf + ret, "Date: %s\n",
                               show_rfc2822_date(time, tz));
                break;
        case CMIT_FMT_FULLER:
-               ret += sprintf(buf + ret, "%sDate: %s\n", what, show_date(time, tz));
+               ret += sprintf(buf + ret, "%sDate: %s\n", what, show_date(time, tz, 0));
                break;
        default:
                /* notin' */

diff --git a/date.c b/date.c
index d780846b664530111a7bb67229987f202825e66d..e387dcd3976d8e12afdce5d7600ca0022f4ca835 100644 (file)
--- a/date.c
+++ b/date.c
@@ -37,6 +37,16 @@ static const char *weekday_names[] = {
        "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays"
 };
 
+static time_t gm_time_t(unsigned long time, int tz)
+{
+       int minutes;
+
+       minutes = tz < 0 ? -tz : tz;
+       minutes = (minutes / 100)*60 + (minutes % 100);
+       minutes = tz < 0 ? -minutes : minutes;
+       return time + minutes * 60;
+}
+
 /*
  * The "tz" thing is passed in as this strange "decimal parse of tz"
  * thing, which means that tz -0100 is passed in as the integer -100,
@@ -44,21 +54,58 @@ static const char *weekday_names[] = {
  */
 static struct tm *time_to_tm(unsigned long time, int tz)
 {
-       time_t t;
-       int minutes;
-
-       minutes = tz < 0 ? -tz : tz;
-       minutes = (minutes / 100)*60 + (minutes % 100);
-       minutes = tz < 0 ? -minutes : minutes;
-       t = time + minutes * 60;
+       time_t t = gm_time_t(time, tz);
        return gmtime(&t);
 }
 
-const char *show_date(unsigned long time, int tz)
+const char *show_date(unsigned long time, int tz, int relative)
 {
        struct tm *tm;
        static char timebuf[200];
 
+       if (relative) {
+               unsigned long diff;
+               time_t t = gm_time_t(time, tz);
+               struct timeval now;
+               gettimeofday(&now, NULL);
+               if (now.tv_sec < t)
+                       return "in the future";
+               diff = now.tv_sec - t;
+               if (diff < 90) {
+                       snprintf(timebuf, sizeof(timebuf), "%lu seconds ago", diff);
+                       return timebuf;
+               }
+               /* Turn it into minutes */
+               diff = (diff + 30) / 60;
+               if (diff < 90) {
+                       snprintf(timebuf, sizeof(timebuf), "%lu minutes ago", diff);
+                       return timebuf;
+               }
+               /* Turn it into hours */
+               diff = (diff + 30) / 60;
+               if (diff < 36) {
+                       snprintf(timebuf, sizeof(timebuf), "%lu hours ago", diff);
+                       return timebuf;
+               }
+               /* We deal with number of days from here on */
+               diff = (diff + 12) / 24;
+               if (diff < 14) {
+                       snprintf(timebuf, sizeof(timebuf), "%lu days ago", diff);
+                       return timebuf;
+               }
+               /* Say weeks for the past 10 weeks or so */
+               if (diff < 70) {
+                       snprintf(timebuf, sizeof(timebuf), "%lu weeks ago", (diff + 3) / 7);
+                       return timebuf;
+               }
+               /* Say months for the past 12 months or so */
+               if (diff < 360) {
+                       snprintf(timebuf, sizeof(timebuf), "%lu months ago", (diff + 15) / 30);
+                       return timebuf;
+               }
+               /* Else fall back on absolute format.. */
+       }
+
        tm = time_to_tm(time, tz);
        if (!tm)
                return NULL;