84 lines
1.9 KiB
Go
84 lines
1.9 KiB
Go
package timertxt
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import (
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"errors"
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"sort"
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"time"
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)
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// Flags for defining sort element and order.
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const (
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SORT_START_DATE_ASC = iota
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SORT_START_DATE_DESC
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SORT_FINISH_DATE_ASC
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SORT_FINISH_DATE_DESC
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)
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// Sort allows a TimerList to be sorted by certain predefined fields.
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// See constants SORT_* for fields and sort order.
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func (timerlist *TimerList) Sort(sortFlag int) error {
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switch sortFlag {
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case SORT_START_DATE_ASC, SORT_START_DATE_DESC:
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timerlist.sortByStartDate(sortFlag)
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case SORT_FINISH_DATE_ASC, SORT_FINISH_DATE_DESC:
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timerlist.sortByFinishDate(sortFlag)
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default:
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return errors.New("Unrecognized sort option")
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}
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return nil
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}
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type timerlistSort struct {
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timerlists TimerList
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by func(t1, t2 *Timer) bool
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}
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func (ts *timerlistSort) Len() int {
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return len(ts.timerlists)
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}
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func (ts *timerlistSort) Swap(l, r int) {
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ts.timerlists[l], ts.timerlists[r] = ts.timerlists[r], ts.timerlists[l]
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}
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func (ts *timerlistSort) Less(l, r int) bool {
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return ts.by(&ts.timerlists[l], &ts.timerlists[r])
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}
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func (timerlist *TimerList) sortBy(by func(t1, t2 *Timer) bool) *TimerList {
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ts := &timerlistSort{
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timerlists: *timerlist,
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by: by,
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}
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sort.Sort(ts)
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return timerlist
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}
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func sortByDate(asc bool, date1, date2 time.Time) bool {
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if asc { // ASC
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if !date1.IsZero() && !date2.IsZero() {
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return date1.Before(date2)
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}
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return !date2.IsZero()
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}
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// DESC
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if !date1.IsZero() && !date2.IsZero() {
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return date1.After(date2)
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}
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return date2.IsZero()
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}
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func (timerlist *TimerList) sortByStartDate(order int) *TimerList {
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timerlist.sortBy(func(t1, t2 *Timer) bool {
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return sortByDate(order == SORT_START_DATE_ASC, t1.StartDate, t2.StartDate)
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})
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return timerlist
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}
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func (timerlist *TimerList) sortByFinishDate(order int) *TimerList {
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timerlist.sortBy(func(t1, t2 *Timer) bool {
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return sortByDate(order == SORT_FINISH_DATE_ASC, t1.FinishDate, t2.FinishDate)
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})
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return timerlist
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}
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