57 lines
1.0 KiB
Go
57 lines
1.0 KiB
Go
package editor
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func (ed *Editor) enterInsert() {
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rs := []rune(ed.lines[ed.row])
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ed.head = string(rs[:ed.col])
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ed.tail = string(rs[ed.col:])
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ed.mode = modeInsert
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}
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func (ed *Editor) enterInsertAfter() {
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len := ed.runeCount()
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if ed.col >= len-1 {
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ed.col = len
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ed.head = ed.lines[ed.row]
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ed.tail = ""
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ed.mode = modeInsert
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return
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}
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ed.moveRight(1)
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ed.enterInsert()
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}
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func (ed *Editor) moveLeft(n int) {
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ed.col = max(ed.col-n, 0)
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}
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func (ed *Editor) moveRight(n int) {
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ed.col = min(ed.col+n, max(ed.runeCount()-1, 0))
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}
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func (ed *Editor) moveDown(n int) {
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ed.row = min(ed.row+n, max(len(ed.lines)-1, 0))
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}
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func (ed *Editor) moveUp(n int) {
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ed.row = max(ed.row-n, 0)
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}
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func (ed *Editor) deleteRune(n int) {
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if len(ed.lines[ed.row]) < 1 {
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return // XXX ring
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}
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rs := []rune(ed.lines[ed.row])
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if ed.col < 1 {
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ed.lines[ed.row] = string(rs[1:])
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} else {
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head := string(rs[:ed.col])
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tail := string(rs[ed.col+1:])
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ed.lines[ed.row] = head + tail
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}
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rc := ed.runeCount()
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if ed.row >= rc-1 {
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ed.row = rc - 1
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}
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}
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