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package viinput
func (m *Model) snapshot() {
history := make([]rune, len(m.runes))
copy(history, m.runes)
m.history = append(m.history, history)
}
func (m *Model) undo() {
if len(m.history) == 0 {
return
}
last := m.history[len(m.history)-1]
m.history = m.history[:len(m.history)-1]
m.runes = append([]rune(nil), last...)
m.cursor = clampInt(m.cursor, 0, len(m.runes))
}
func (m *Model) insertText(text string) {
if text == "" {
return
}
m.snapshot()
runes := []rune(text)
if m.cursor < 0 {
m.cursor = 0
}
if m.cursor > len(m.runes) {
m.cursor = len(m.runes)
}
next := make([]rune, 0, len(m.runes)+len(runes))
next = append(next, m.runes[:m.cursor]...)
next = append(next, runes...)
next = append(next, m.runes[m.cursor:]...)
m.runes = next
m.cursor += len(runes)
}
func (m *Model) deleteBeforeCursor() {
m.deleteRange(m.cursor-1, m.cursor)
}
func (m *Model) deleteAtCursor() {
m.deleteRange(m.cursor, m.cursor+1)
}
func (m *Model) deleteLine() {
m.deleteRange(0, len(m.runes))
}
func (m *Model) deleteToLineEnd() {
m.deleteRange(m.cursor, len(m.runes))
}
func (m *Model) deleteFromLineStart() {
m.deleteRange(0, m.cursor)
}
func (m *Model) deleteWordForward() {
m.deleteRange(m.cursor, wordForward(m.runes, m.cursor))
}
func (m *Model) deleteWordEnd() {
end := wordEnd(m.runes, m.cursor)
if end < len(m.runes) {
end++
}
m.deleteRange(m.cursor, end)
}
func (m *Model) deleteWordBackward() {
m.deleteRange(wordBackward(m.runes, m.cursor), m.cursor)
}
func (m *Model) changeToLineEnd() {
m.deleteToLineEnd()
m.mode = ModeInsert
m.pending = 0
}
func (m *Model) deleteRange(start, end int) {
if len(m.runes) == 0 {
return
}
start = clampInt(start, 0, len(m.runes))
end = clampInt(end, 0, len(m.runes))
if start > end {
start, end = end, start
}
if start == end {
return
}
m.snapshot()
next := make([]rune, 0, len(m.runes)-(end-start))
next = append(next, m.runes[:start]...)
next = append(next, m.runes[end:]...)
m.runes = next
m.cursor = start
}
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