func moveDotUp(ed *Editor, k Key) *leReturn {
sol := util.FindLastSOL(ed.line[:ed.dot])
if sol == 0 {
ed.beep()
return nil
}
prevEOL := sol - 1
prevSOL := util.FindLastSOL(ed.line[:prevEOL])
width := WcWidths(ed.line[sol:ed.dot])
ed.dot = prevSOL + len(TrimWcWidth(ed.line[prevSOL:prevEOL], width))
return nil
}
func moveDotDown(ed *Editor, k Key) *leReturn {
eol := util.FindFirstEOL(ed.line[ed.dot:]) + ed.dot
if eol == len(ed.line) {
ed.beep()
return nil
}
nextSOL := eol + 1
nextEOL := util.FindFirstEOL(ed.line[nextSOL:]) + nextSOL
sol := util.FindLastSOL(ed.line[:ed.dot])
width := WcWidths(ed.line[sol:ed.dot])
ed.dot = nextSOL + len(TrimWcWidth(ed.line[nextSOL:nextEOL], width))
return nil
}
func killLineLeft(ed *Editor, k Key) *leReturn {
sol := util.FindLastSOL(ed.line[:ed.dot])
ed.line = ed.line[:sol] + ed.line[ed.dot:]
ed.dot = sol
return nil
}