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