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package squirssi
import (
"sync"
"code.dopame.me/veonik/squirssi/widget"
)
type HistoryManager struct {
histories map[Window][]widget.ModedText
cursors map[Window]int
mu sync.Mutex
}
func NewHistoryManager() *HistoryManager {
return &HistoryManager{
histories: make(map[Window][]widget.ModedText),
cursors: make(map[Window]int),
}
}
func (hm *HistoryManager) Append(win Window, input widget.ModedText) {
hm.mu.Lock()
defer hm.mu.Unlock()
hm.cursors[win] = len(hm.histories[win])
hm.append(win, input)
hm.cursors[win] = len(hm.histories[win])
}
func (hm *HistoryManager) Insert(win Window, input widget.ModedText) {
hm.mu.Lock()
defer hm.mu.Unlock()
if hm.current(win) == input {
return
}
hm.append(win, input)
}
func (hm *HistoryManager) append(win Window, input widget.ModedText) {
hm.histories[win] = append(append(append([]widget.ModedText{}, hm.histories[win][:hm.cursors[win]]...), input), hm.histories[win][hm.cursors[win]:]...)
}
func (hm *HistoryManager) current(win Window) widget.ModedText {
if hm.cursors[win] < 0 {
hm.cursors[win] = 0
}
if hm.cursors[win] >= len(hm.histories[win]) {
hm.cursors[win] = len(hm.histories[win])
return widget.ModedText{}
}
return hm.histories[win][hm.cursors[win]]
}
func (hm *HistoryManager) Current(win Window) widget.ModedText {
hm.mu.Lock()
defer hm.mu.Unlock()
return hm.current(win)
}
func (hm *HistoryManager) Previous(win Window) widget.ModedText {
hm.mu.Lock()
defer hm.mu.Unlock()
hm.cursors[win] -= 1
res := hm.current(win)
return res
}
func (hm *HistoryManager) Next(win Window) widget.ModedText {
hm.mu.Lock()
defer hm.mu.Unlock()
hm.cursors[win] += 1
res := hm.current(win)
return res
}