[WIP] Task editing

taskwarrior/models.go

@@ -197,6 +197,30 @@ func (t *Task) GetDate(dateString string) time.Time {
 	return dt
 }
 
+func (t *Task) HasTag(tag string) bool {
+	for _, t := range t.Tags {
+		if t == tag {
+			return true
+		}
+	}
+	return false
+}
+
+func (t *Task) AddTag(tag string) {
+	if !t.HasTag(tag) {
+		t.Tags = append(t.Tags, tag)
+	}
+}
+
+func (t *Task) RemoveTag(tag string) {
+	for i, ttag := range t.Tags {
+		if ttag == tag {
+			t.Tags = append(t.Tags[:i], t.Tags[i+1:]...)
+			return
+		}
+	}
+}
+
 type Tasks []*Task
 
 type Context struct {
@@ -291,3 +315,97 @@ func parseCountdown(d time.Duration) string {
 
 	return fmt.Sprintf("%d:%02d:%02d", hours, minutes, seconds)
 }
+
+var (
+	dateFormats = []string{
+		"2006-01-02",
+		"2006-01-02T15:04",
+		"20060102T150405Z",
+	}
+
+	specialDateFormats = []string{
+		"",
+		"now",
+		"today",
+		"sod",
+		"eod",
+		"yesterday",
+		"tomorrow",
+		"monday",
+		"tuesday",
+		"wednesday",
+		"thursday",
+		"friday",
+		"saturday",
+		"sunday",
+		"mon",
+		"tue",
+		"wed",
+		"thu",
+		"fri",
+		"sat",
+		"sun",
+		"soy",
+		"eoy",
+		"soq",
+		"eoq",
+		"som",
+		"eom",
+		"socm",
+		"eocm",
+		"sow",
+		"eow",
+		"socw",
+		"eocw",
+		"soww",
+		"eoww",
+		"1st",
+		"2nd",
+		"3rd",
+		"4th",
+		"5th",
+		"6th",
+		"7th",
+		"8th",
+		"9th",
+		"10th",
+		"11th",
+		"12th",
+		"13th",
+		"14th",
+		"15th",
+		"16th",
+		"17th",
+		"18th",
+		"19th",
+		"20th",
+		"21st",
+		"22nd",
+		"23rd",
+		"24th",
+		"25th",
+		"26th",
+		"27th",
+		"28th",
+		"29th",
+		"30th",
+		"31st",
+	}
+)
+
+func ValidateDate(s string) error {
+
+	for _, f := range dateFormats {
+		if _, err := time.Parse(f, s); err == nil {
+			return nil
+		}
+	}
+
+	for _, f := range specialDateFormats {
+		if s == f {
+			return nil
+		}
+	}
+
+	return fmt.Errorf("invalid date")
+}