Teach "approxidate" about weekday syntax

On Fri, 18 Nov 2005, David Roundy wrote:
>
> Don't forget "high noon"!  (and perhaps "tea time"?)  :)

Done.

    [torvalds@g5 git]$ ./test-date "now" "midnight" "high noon" "tea-time"
    now -> bad -> Wed Dec 31 16:00:00 1969
    now -> Fri Nov 18 08:50:54 2005

    midnight -> bad -> Wed Dec 31 16:00:00 1969
    midnight -> Fri Nov 18 00:00:00 2005

    high noon -> bad -> Wed Dec 31 16:00:00 1969
    high noon -> Thu Nov 17 12:00:00 2005

    tea-time -> bad -> Wed Dec 31 16:00:00 1969
    tea-time -> Thu Nov 17 17:00:00 2005

Thanks for pointing out tea-time.

This is also written to easily extended to allow people to add their own
important dates like Christmas and their own birthdays.

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

diff --git a/date.c b/date.c
index d2a67cc..3e11500 100644 (file)
--- a/date.c
+++ b/date.c
@@ -468,12 +468,52 @@ static void update_tm(struct tm *tm, unsigned long sec)
        localtime_r(&n, tm);
 }
 
+static void date_yesterday(struct tm *tm, int *num)
+{
+       update_tm(tm, 24*60*60);
+}
+
+static void date_time(struct tm *tm, int hour)
+{
+       if (tm->tm_hour < hour)
+               date_yesterday(tm, NULL);
+       tm->tm_hour = hour;
+       tm->tm_min = 0;
+       tm->tm_sec = 0;
+}
+
+static void date_midnight(struct tm *tm, int *num)
+{
+       date_time(tm, 0);
+}
+
+static void date_noon(struct tm *tm, int *num)
+{
+       date_time(tm, 12);
+}
+
+static void date_tea(struct tm *tm, int *num)
+{
+       date_time(tm, 17);
+}
+
+static const struct special {
+       const char *name;
+       void (*fn)(struct tm *, int *);
+} special[] = {
+       { "yesterday", date_yesterday },
+       { "noon", date_noon },
+       { "midnight", date_midnight },
+       { "tea", date_tea },
+       { NULL }
+};
+
 static const char *number_name[] = {
        "zero", "one", "two", "three", "four",
        "five", "six", "seven", "eight", "nine", "ten",
 };
 
-static struct typelen {
+static const struct typelen {
        const char *type;
        int length;
 } typelen[] = {
@@ -487,7 +527,8 @@ static struct typelen {
 
 static const char *approxidate_alpha(const char *date, struct tm *tm, int *num)
 {
-       struct typelen *tl;
+       const struct typelen *tl;
+       const struct special *s;
        const char *end = date;
        int n = 1, i;
 
@@ -502,9 +543,12 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num)
                }
        }
 
-       if (match_string(date, "yesterday") > 8) {
-               update_tm(tm, 24*60*60);
-               return end;
+       for (s = special; s->name; s++) {
+               int len = strlen(s->name);
+               if (match_string(date, s->name) == len) {
+                       s->fn(tm, num);
+                       return end;
+               }
        }
 
        if (!*num) {