feat: add ctrl delete to forward delete word (#138)

* feat: add ctrl delete to forward delete word (closes #124)

* fix: make delete word function accurately

* fix: make ctrl delete work on st

readline/codes.go

@@ -49,6 +49,8 @@ var (
 	seqEndSc        = string([]byte{27, 91, 52, 126})
 	seqDelete       = string([]byte{27, 91, 51, 126})
 	seqDelete2      = string([]byte{27, 91, 80})
+	seqCtrlDelete   = string([]byte{27, 91, 51, 59, 53, 126})
+	seqCtrlDelete2  = string([]byte{27, 91, 77})
 	seqShiftTab     = string([]byte{27, 91, 90})
 	seqAltQuote     = string([]byte{27, 34})  // Added for showing registers ^["
 	seqAltR         = string([]byte{27, 114}) // Used for alternative history

readline/line.go

@@ -182,3 +182,27 @@ func (rl *Instance) deleteToEnd() {
 	// Keep everything before the cursor
 	rl.line = rl.line[:rl.pos]
 }
+
+func (rl *Instance) emacsForwardWord(tokeniser tokeniser) (adjust int) {
+	// when emacs has more specific stuff, move this in a file with then
+	split, index, pos := tokeniser(rl.line, rl.pos)
+	if len(split) == 0 {
+		return
+	}
+
+	word := rTrimWhiteSpace(split[index])
+
+	switch {
+	case len(split) == 0:
+		return
+	case index == len(split)-1 && pos >= len(word)-1:
+		return
+	case pos >= len(word)-1:
+		word = rTrimWhiteSpace(split[index+1])
+		adjust = len(split[index]) - pos
+		adjust += len(word)
+	default:
+		adjust = len(word) - pos
+	}
+	return
+}

readline/readline.go

@@ -786,6 +786,19 @@ func (rl *Instance) escapeSeq(r []rune) {
 		rl.viDeleteByAdjust(rl.viJumpB(tokeniseLine))
 		rl.updateHelpers()
 
+	case seqCtrlDelete, seqCtrlDelete2:
+		if rl.modeTabCompletion {
+			rl.resetVirtualComp(false)
+		}
+		// This is only available in Insert mode
+		if rl.modeViMode != VimInsert {
+			return
+		}
+		rl.saveToRegister(rl.emacsForwardWord(tokeniseLine))
+		// vi delete, emacs forward, funny huh
+		rl.viDeleteByAdjust(rl.emacsForwardWord(tokeniseLine))
+		rl.updateHelpers()
+
 	default:
 		if rl.modeTabFind {
 			return