Add date formatting and parsing functions relative to a given time

The main purpose is to allow predictable testing of the code.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/cache.h b/cache.h
index f7937893773a4b015df7fafc605e2d561139c86b..cd5aa89ca90c6405a9f4872d139b053880cff06b 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -731,9 +731,14 @@ enum date_mode {
 };
 
 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
+const char *show_date_relative(unsigned long time, int tz,
+                              const struct timeval *now,
+                              char *timebuf,
+                              size_t timebuf_size);
 int parse_date(const char *date, char *buf, int bufsize);
 void datestamp(char *buf, int bufsize);
 unsigned long approxidate(const char *);
+unsigned long approxidate_relative(const char *date, const struct timeval *now);
 enum date_mode parse_date_format(const char *format);
 
 #define IDENT_WARN_ON_NO_NAME  1

diff --git a/date.c b/date.c
index 1de184587ba33e8c677ec8040c4c4e177ef41c55..8e57e5eb82450a448ea8096cf4a87810b58226c3 100644 (file)
--- a/date.c
+++ b/date.c
@@ -86,6 +86,67 @@ static int local_tzoffset(unsigned long time)
        return offset * eastwest;
 }
 
+const char *show_date_relative(unsigned long time, int tz,
+                              const struct timeval *now,
+                              char *timebuf,
+                              size_t timebuf_size)
+{
+       unsigned long diff;
+       if (now->tv_sec < time)
+               return "in the future";
+       diff = now->tv_sec - time;
+       if (diff < 90) {
+               snprintf(timebuf, timebuf_size, "%lu seconds ago", diff);
+               return timebuf;
+       }
+       /* Turn it into minutes */
+       diff = (diff + 30) / 60;
+       if (diff < 90) {
+               snprintf(timebuf, timebuf_size, "%lu minutes ago", diff);
+               return timebuf;
+       }
+       /* Turn it into hours */
+       diff = (diff + 30) / 60;
+       if (diff < 36) {
+               snprintf(timebuf, timebuf_size, "%lu hours ago", diff);
+               return timebuf;
+       }
+       /* We deal with number of days from here on */
+       diff = (diff + 12) / 24;
+       if (diff < 14) {
+               snprintf(timebuf, timebuf_size, "%lu days ago", diff);
+               return timebuf;
+       }
+       /* Say weeks for the past 10 weeks or so */
+       if (diff < 70) {
+               snprintf(timebuf, timebuf_size, "%lu weeks ago", (diff + 3) / 7);
+               return timebuf;
+       }
+       /* Say months for the past 12 months or so */
+       if (diff < 360) {
+               snprintf(timebuf, timebuf_size, "%lu months ago", (diff + 15) / 30);
+               return timebuf;
+       }
+       /* Give years and months for 5 years or so */
+       if (diff < 1825) {
+               unsigned long years = diff / 365;
+               unsigned long months = (diff % 365 + 15) / 30;
+               int n;
+               n = snprintf(timebuf, timebuf_size, "%lu year%s",
+                               years, (years > 1 ? "s" : ""));
+               if (months)
+                       snprintf(timebuf + n, timebuf_size - n,
+                                       ", %lu month%s ago",
+                                       months, (months > 1 ? "s" : ""));
+               else
+                       snprintf(timebuf + n, timebuf_size - n, " ago");
+               return timebuf;
+       }
+       /* Otherwise, just years. Centuries is probably overkill. */
+       snprintf(timebuf, timebuf_size, "%lu years ago", (diff + 183) / 365);
+       return timebuf;
+}
+
 const char *show_date(unsigned long time, int tz, enum date_mode mode)
 {
        struct tm *tm;
@@ -97,63 +158,10 @@ const char *show_date(unsigned long time, int tz, enum date_mode mode)
        }
 
        if (mode == DATE_RELATIVE) {
-               unsigned long diff;
                struct timeval now;
                gettimeofday(&now, NULL);
-               if (now.tv_sec < time)
-                       return "in the future";
-               diff = now.tv_sec - time;
-               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;
-               }
-               /* Give years and months for 5 years or so */
-               if (diff < 1825) {
-                       unsigned long years = (diff + 183) / 365;
-                       unsigned long months = (diff % 365 + 15) / 30;
-                       int n;
-                       n = snprintf(timebuf, sizeof(timebuf), "%lu year%s",
-                                       years, (years > 1 ? "s" : ""));
-                       if (months)
-                               snprintf(timebuf + n, sizeof(timebuf) - n,
-                                       ", %lu month%s ago",
-                                       months, (months > 1 ? "s" : ""));
-                       else
-                               snprintf(timebuf + n, sizeof(timebuf) - n,
-                                       " ago");
-                       return timebuf;
-               }
-               /* Otherwise, just years. Centuries is probably overkill. */
-               snprintf(timebuf, sizeof(timebuf), "%lu years ago", (diff + 183) / 365);
-               return timebuf;
+               return show_date_relative(time, tz, &now,
+                                         timebuf, sizeof(timebuf));
        }
 
        if (mode == DATE_LOCAL)
@@ -918,19 +926,13 @@ static void pending_number(struct tm *tm, int *num)
        }
 }
 
-unsigned long approxidate(const char *date)
+static unsigned long approxidate_str(const char *date, const struct timeval *tv)
 {
        int number = 0;
        struct tm tm, now;
-       struct timeval tv;
        time_t time_sec;
-       char buffer[50];
 
-       if (parse_date(date, buffer, sizeof(buffer)) > 0)
-               return strtoul(buffer, NULL, 10);
-
-       gettimeofday(&tv, NULL);
-       time_sec = tv.tv_sec;
+       time_sec = tv->tv_sec;
        localtime_r(&time_sec, &tm);
        now = tm;
 
@@ -954,3 +956,25 @@ unsigned long approxidate(const char *date)
        pending_number(&tm, &number);
        return update_tm(&tm, &now, 0);
 }
+
+unsigned long approxidate_relative(const char *date, const struct timeval *tv)
+{
+       char buffer[50];
+
+       if (parse_date(date, buffer, sizeof(buffer)) > 0)
+               return strtoul(buffer, NULL, 0);
+
+       return approxidate_str(date, tv);
+}
+
+unsigned long approxidate(const char *date)
+{
+       struct timeval tv;
+       char buffer[50];
+
+       if (parse_date(date, buffer, sizeof(buffer)) > 0)
+               return strtoul(buffer, NULL, 0);
+
+       gettimeofday(&tv, NULL);
+       return approxidate_str(date, &tv);
+}