Upstream olebedev/when state of the touched files before 978901adc2

rules/context.go

@@ -0,0 +1,68 @@
+package rules
+
+import "time"
+
+type Context struct {
+	Text string
+
+	// accumulator of relative values
+	Duration time.Duration
+
+	// Aboslute values
+	Year, Month, Weekday, Day, Hour, Minute, Second *int
+
+	Location *time.Location
+}
+
+func (c *Context) Time(t time.Time) (time.Time, error) {
+	if t.IsZero() {
+		t = time.Now()
+	}
+
+	if c.Duration != 0 {
+		t = t.Add(c.Duration)
+	}
+
+	if c.Year != nil {
+		t = time.Date(*c.Year, t.Month(), t.Day(), t.Hour(),
+			t.Minute(), t.Second(), t.Nanosecond(), t.Location())
+	}
+
+	if c.Month != nil {
+		t = time.Date(t.Year(), time.Month(*c.Month), t.Day(),
+			t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), t.Location())
+	}
+
+	if c.Weekday != nil {
+		diff := int(time.Weekday(*c.Weekday) - t.Weekday())
+		t = time.Date(t.Year(), t.Month(), t.Day()+diff, t.Hour(),
+			t.Minute(), t.Second(), t.Nanosecond(), t.Location())
+	}
+
+	if c.Day != nil {
+		t = time.Date(t.Year(), t.Month(), *c.Day, t.Hour(),
+			t.Minute(), t.Second(), t.Nanosecond(), t.Location())
+	}
+
+	if c.Hour != nil {
+		t = time.Date(t.Year(), t.Month(), t.Day(), *c.Hour,
+			t.Minute(), t.Second(), t.Nanosecond(), t.Location())
+	}
+
+	if c.Minute != nil {
+		t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(),
+			*c.Minute, t.Second(), t.Nanosecond(), t.Location())
+	}
+
+	if c.Second != nil {
+		t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(),
+			t.Minute(), *c.Second, t.Nanosecond(), t.Location())
+	}
+
+	if c.Location != nil {
+		t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(),
+			t.Minute(), t.Second(), t.Nanosecond(), c.Location)
+	}
+
+	return t, nil
+}