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authorLukas Fleischer <lfleischer@calcurse.org>2016-02-25 21:31:16 +0100
committerLukas Fleischer <lfleischer@calcurse.org>2016-02-26 09:14:40 +0100
commitf5d8b5e021a62bf3e36e18aa9aebee331fece8dd (patch)
tree959b101037e40ee4b7f5fa6392fceb416b666e42 /src/utils.c
parentc34f9aba29b965bf1da7e16da91ebf94ae123e89 (diff)
downloadcalcurse-f5d8b5e021a62bf3e36e18aa9aebee331fece8dd.zip
Support durations in recurrence ending dates
When spending the end date of recurring items, allow date duration specifiers such as "+5d" or "+3w2d". Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
Diffstat (limited to 'src/utils.c')
-rw-r--r--src/utils.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/src/utils.c b/src/utils.c
index 4ce9364..4300b59 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -455,6 +455,26 @@ void date_sec2date_fmt(long sec, const char *fmt, char *datef)
/*
* Used to change date by adding a certain amount of days or weeks.
+ * Returns 0 on success, 1 otherwise.
+ */
+int date_change(struct tm *date, int delta_month, int delta_day)
+{
+ struct tm t;
+
+ t = *date;
+ t.tm_mon += delta_month;
+ t.tm_mday += delta_day;
+
+ if (mktime(&t) == -1) {
+ return 1;
+ } else {
+ *date = t;
+ return 0;
+ }
+}
+
+/*
+ * Used to change date by adding a certain amount of days or weeks.
*/
long date_sec_change(long date, int delta_month, int delta_day)
{
@@ -840,6 +860,77 @@ parse_date(const char *date_string, enum datefmt datefmt, int *year,
}
/*
+ * Convert a date duration string into a number of days.
+ *
+ * Returns 1 on success and 0 on failure.
+ */
+int parse_date_duration(const char *string, unsigned *days)
+{
+ enum {
+ STATE_INITIAL,
+ STATE_WWDD_DD,
+ STATE_DONE
+ } state = STATE_INITIAL;
+
+ const char *p;
+ unsigned in = 0, frac = 0, denom = 1;
+ unsigned dur = 0;
+
+ if (!string || *string == '\0')
+ return 0;
+
+ /* parse string using a simple state machine */
+ for (p = string; *p; p++) {
+ if (state == STATE_DONE) {
+ return 0;
+ } else if ((*p >= '0') && (*p <= '9')) {
+ in = in * 10 + (int)(*p - '0');
+ if (frac)
+ denom *= 10;
+ } else if (*p == '.') {
+ if (frac)
+ return 0;
+ frac++;
+ } else {
+ switch (state) {
+ case STATE_INITIAL:
+ if (*p == 'w') {
+ dur += in * WEEKINDAYS / denom;
+ state = STATE_WWDD_DD;
+ } else if (*p == 'd') {
+ dur += in / denom;
+ state = STATE_DONE;
+ } else {
+ return 0;
+ }
+ break;
+ case STATE_WWDD_DD:
+ if (*p == 'd') {
+ dur += in / denom;
+ state = STATE_DONE;
+ } else {
+ return 0;
+ }
+ break;
+ default:
+ break;
+ }
+
+ in = frac = 0;
+ denom = 1;
+ }
+ }
+
+ if (state == STATE_DONE && in > 0)
+ return 0;
+
+ dur += in;
+ *days = dur;
+
+ return 1;
+}
+
+/*
* Check if time is valid.
*/
int check_time(unsigned hours, unsigned minutes)