builtin-grep: make pieces of it available as library.

[git.git] / date.c

diff --git a/date.c b/date.c
index 365dc3b14e47826dd7becf19a76e29bfaa6b2eb5..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;
@@ -369,7 +416,7 @@ static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt
 
        /* Four-digit year or a timezone? */
        if (n == 4) {
-               if (num <= 1200 && *offset == -1) {
+               if (num <= 1400 && *offset == -1) {
                        unsigned int minutes = num % 100;
                        unsigned int hours = num / 100;
                        *offset = hours*60 + minutes;
@@ -584,10 +631,10 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num)
        const struct typelen *tl;
        const struct special *s;
        const char *end = date;
-       int n = 1, i;
+       int i;
 
-       while (isalpha(*++end))
-               n++;
+       while (isalpha(*++end));
+               ;
 
        for (i = 0; i < 12; i++) {
                int match = match_string(date, month_names[i]);