Hilbish/readline/vim.go

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package readline
import (
"fmt"
"strconv"
)
// InputMode - The shell input mode
type InputMode int
const (
// Vim - Vim editing mode
Vim = iota
// Emacs - Emacs (classic) editing mode
Emacs
)
type ViMode int
const (
VimInsert ViMode = iota
VimReplaceOnce
VimReplaceMany
VimDelete
VimKeys
)
var (
VimInsertStr = "[I]"
VimReplaceOnceStr = "[V]"
VimReplaceManyStr = "[R]"
VimDeleteStr = "[D]"
VimKeysStr = "[N]"
)
type ViAction int
const (
VimActionYank = iota
VimActionPaste
)
var (
// registerFreeKeys - Some Vim keys don't act on/ aren't affected by registers,
// and using these keys will automatically cancel any active register.
// NOTE: Don't forget to update if you add Vim bindings !!
registerFreeKeys = []rune{'a', 'A', 'h', 'i', 'I', 'j', 'k', 'l', 'r', 'R', 'u', 'v', '$', '%', '[', ']'}
// validRegisterKeys - All valid register IDs (keys) for read/write Vim registers
validRegisterKeys = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789/-\""
)
// vi - Apply a key to a Vi action. Note that as in the rest of the code, all cursor movements
// have been moved away, and only the rl.pos is adjusted: when echoing the input line, the shell
// will compute the new cursor pos accordingly.
func (rl *Instance) vi(r rune) {
activeRegister := string(rl.registers.currentRegister)
// Check if we are in register mode. If yes, and for some characters,
// we select the register and exit this func immediately.
if rl.registers.registerSelectWait {
for _, char := range validRegisterKeys {
if r == char {
rl.registers.setActiveRegister(r)
return
}
}
}
// If we are on register mode and one is already selected,
// check if the key stroke to be evaluated is acting on it
// or not: if not, we cancel the active register now.
if rl.registers.onRegister {
for _, char := range registerFreeKeys {
if char == r {
rl.registers.resetRegister()
}
}
}
// Then evaluate the key.
switch r {
case 'a':
if len(rl.line) > 0 {
rl.pos++
}
rl.modeViMode = VimInsert
rl.viIteration = ""
rl.viUndoSkipAppend = true
case 'A':
if len(rl.line) > 0 {
rl.pos = len(rl.line)
}
rl.modeViMode = VimInsert
rl.viIteration = ""
rl.viUndoSkipAppend = true
case 'b':
if rl.viIsYanking {
vii := rl.getViIterations()
rl.saveToRegisterTokenize(tokeniseLine, rl.viJumpB, vii)
rl.viIsYanking = false
return
}
rl.viUndoSkipAppend = true
vii := rl.getViIterations()
for i := 1; i <= vii; i++ {
rl.moveCursorByAdjust(rl.viJumpB(tokeniseLine))
}
case 'B':
if rl.viIsYanking {
vii := rl.getViIterations()
rl.saveToRegisterTokenize(tokeniseSplitSpaces, rl.viJumpB, vii)
rl.viIsYanking = false
return
}
rl.viUndoSkipAppend = true
vii := rl.getViIterations()
for i := 1; i <= vii; i++ {
rl.moveCursorByAdjust(rl.viJumpB(tokeniseSplitSpaces))
}
case 'd':
rl.modeViMode = VimDelete
rl.viUndoSkipAppend = true
case 'D':
rl.saveBufToRegister(rl.line[rl.pos-1:])
rl.line = rl.line[:rl.pos]
// Only go back if there is an input
if len(rl.line) > 0 {
rl.pos--
}
rl.resetHelpers()
rl.updateHelpers()
rl.viIteration = ""
case 'e':
if rl.viIsYanking {
vii := rl.getViIterations()
rl.saveToRegisterTokenize(tokeniseLine, rl.viJumpE, vii)
rl.viIsYanking = false
return
}
rl.viUndoSkipAppend = true
vii := rl.getViIterations()
for i := 1; i <= vii; i++ {
rl.moveCursorByAdjust(rl.viJumpE(tokeniseLine))
}
case 'E':
if rl.viIsYanking {
vii := rl.getViIterations()
rl.saveToRegisterTokenize(tokeniseSplitSpaces, rl.viJumpE, vii)
rl.viIsYanking = false
return
}
rl.viUndoSkipAppend = true
vii := rl.getViIterations()
for i := 1; i <= vii; i++ {
rl.moveCursorByAdjust(rl.viJumpE(tokeniseSplitSpaces))
}
case 'h':
if rl.pos > 0 {
rl.pos--
}
rl.viUndoSkipAppend = true
case 'i':
rl.modeViMode = VimInsert
rl.viIteration = ""
rl.viUndoSkipAppend = true
rl.registers.resetRegister()
case 'I':
rl.modeViMode = VimInsert
rl.viIteration = ""
rl.viUndoSkipAppend = true
rl.pos = 0
case 'j':
// Set the main history as the one we navigate, by default
rl.mainHist = true
rl.walkHistory(-1)
case 'k':
// Set the main history as the one we navigate, by default
rl.mainHist = true
rl.walkHistory(1)
case 'l':
if (rl.modeViMode == VimInsert && rl.pos < len(rl.line)) ||
(rl.modeViMode != VimInsert && rl.pos < len(rl.line)-1) {
rl.pos++
}
rl.viUndoSkipAppend = true
case 'p':
// paste after the cursor position
rl.viUndoSkipAppend = true
rl.pos++
buffer := rl.pasteFromRegister()
vii := rl.getViIterations()
rl.ViActionCallback(VimActionPaste, []string{activeRegister, string(buffer)})
for i := 1; i <= vii; i++ {
rl.insert(buffer)
}
rl.pos--
case 'P':
// paste before
rl.viUndoSkipAppend = true
buffer := rl.pasteFromRegister()
vii := rl.getViIterations()
rl.ViActionCallback(VimActionPaste, []string{activeRegister, string(buffer)})
for i := 1; i <= vii; i++ {
rl.insert(buffer)
}
case 'r':
rl.modeViMode = VimReplaceOnce
rl.viIteration = ""
rl.viUndoSkipAppend = true
case 'R':
rl.modeViMode = VimReplaceMany
rl.viIteration = ""
rl.viUndoSkipAppend = true
case 'u':
rl.undoLast()
rl.viUndoSkipAppend = true
case 'v':
rl.clearHelpers()
var multiline []rune
if rl.GetMultiLine == nil {
multiline = rl.line
} else {
multiline = rl.GetMultiLine(rl.line)
}
// Keep the previous cursor position
prev := rl.pos
new, err := rl.StartEditorWithBuffer(multiline, "")
if err != nil || len(new) == 0 || string(new) == string(multiline) {
fmt.Println(err)
rl.viUndoSkipAppend = true
return
}
// Clean the shell and put the new buffer, with adjusted pos if needed.
rl.clearLine()
rl.line = new
if prev > len(rl.line) {
rl.pos = len(rl.line) - 1
} else {
rl.pos = prev
}
case 'w':
// If we were not yanking
rl.viUndoSkipAppend = true
// If the input line is empty, we don't do anything
if rl.pos == 0 && len(rl.line) == 0 {
return
}
// If we were yanking, we forge the new yank buffer
// and return without moving the cursor.
if rl.viIsYanking {
vii := rl.getViIterations()
rl.saveToRegisterTokenize(tokeniseLine, rl.viJumpW, vii)
rl.viIsYanking = false
return
}
// Else get iterations and move
vii := rl.getViIterations()
for i := 1; i <= vii; i++ {
rl.moveCursorByAdjust(rl.viJumpW(tokeniseLine))
}
case 'W':
// If the input line is empty, we don't do anything
if rl.pos == 0 && len(rl.line) == 0 {
return
}
rl.viUndoSkipAppend = true
if rl.viIsYanking {
vii := rl.getViIterations()
rl.saveToRegisterTokenize(tokeniseSplitSpaces, rl.viJumpW, vii)
rl.viIsYanking = false
return
}
vii := rl.getViIterations()
for i := 1; i <= vii; i++ {
rl.moveCursorByAdjust(rl.viJumpW(tokeniseSplitSpaces))
}
case 'x':
vii := rl.getViIterations()
// We might be on an active register, but not yanking...
rl.saveToRegister(vii)
// Delete the chars in the line anyway
for i := 1; i <= vii; i++ {
rl.deleteX()
}
if rl.pos == len(rl.line) && len(rl.line) > 0 {
rl.pos--
}
case 'y':
if rl.viIsYanking {
rl.ViActionCallback(VimActionYank, []string{activeRegister, string(rl.line)})
rl.saveBufToRegister(rl.line)
rl.viIsYanking = false
}
rl.viIsYanking = true
rl.viUndoSkipAppend = true
case 'Y':
rl.ViActionCallback(VimActionYank, []string{activeRegister, string(rl.line)})
rl.saveBufToRegister(rl.line)
rl.viUndoSkipAppend = true
case '[':
if rl.viIsYanking {
rl.saveToRegister(rl.viJumpPreviousBrace())
rl.viIsYanking = false
return
}
rl.viUndoSkipAppend = true
rl.moveCursorByAdjust(rl.viJumpPreviousBrace())
case ']':
if rl.viIsYanking {
rl.saveToRegister(rl.viJumpNextBrace())
rl.viIsYanking = false
return
}
rl.viUndoSkipAppend = true
rl.moveCursorByAdjust(rl.viJumpNextBrace())
case '$':
if rl.viIsYanking {
rl.saveBufToRegister(rl.line[rl.pos:])
rl.viIsYanking = false
return
}
rl.pos = len(rl.line)
rl.viUndoSkipAppend = true
case '%':
if rl.viIsYanking {
rl.saveToRegister(rl.viJumpBracket())
rl.viIsYanking = false
return
}
rl.viUndoSkipAppend = true
rl.moveCursorByAdjust(rl.viJumpBracket())
case '"':
// We might be on a register already, so reset it,
// and then wait again for a new register ID.
if rl.registers.onRegister {
rl.registers.resetRegister()
}
rl.registers.registerSelectWait = true
default:
if r <= '9' && '0' <= r {
rl.viIteration += string(r)
}
rl.viUndoSkipAppend = true
}
}
func (rl *Instance) getViIterations() int {
i, _ := strconv.Atoi(rl.viIteration)
if i < 1 {
i = 1
}
rl.viIteration = ""
return i
}
func (rl *Instance) refreshVimStatus() {
rl.ViModeCallback(rl.modeViMode)
rl.computePrompt()
rl.updateHelpers()
}
// viInfoMessage - lmorg's way of showing Vim status is to overwrite the info.
// Currently not used, as there is a possibility to show the current Vim mode in the prompt.
func (rl *Instance) viInfoMessage() {
switch rl.modeViMode {
case VimKeys:
rl.infoText = []rune("-- VIM KEYS -- (press `i` to return to normal editing mode)")
case VimInsert:
rl.infoText = []rune("-- INSERT --")
case VimReplaceOnce:
rl.infoText = []rune("-- REPLACE CHARACTER --")
case VimReplaceMany:
rl.infoText = []rune("-- REPLACE --")
case VimDelete:
rl.infoText = []rune("-- DELETE --")
default:
rl.getInfoText()
}
rl.clearHelpers()
rl.renderHelpers()
}
func (rl *Instance) viJumpB(tokeniser tokeniser) (adjust int) {
split, index, pos := tokeniser(rl.line, rl.pos)
switch {
case len(split) == 0:
return
case index == 0 && pos == 0:
return
case pos == 0:
adjust = len(split[index-1])
default:
adjust = pos
}
return adjust * -1
}
func (rl *Instance) viJumpE(tokeniser tokeniser) (adjust int) {
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) - 1
default:
adjust = len(word) - pos - 1
}
return
}
func (rl *Instance) viJumpW(tokeniser tokeniser) (adjust int) {
split, index, pos := tokeniser(rl.line, rl.pos)
switch {
case len(split) == 0:
return
case index+1 == len(split):
adjust = len(rl.line) - rl.pos
default:
adjust = len(split[index]) - pos
}
return
}
func (rl *Instance) viJumpPreviousBrace() (adjust int) {
if rl.pos == 0 {
return 0
}
for i := rl.pos - 1; i != 0; i-- {
if rl.line[i] == '{' {
return i - rl.pos
}
}
return 0
}
func (rl *Instance) viJumpNextBrace() (adjust int) {
if rl.pos >= len(rl.line)-1 {
return 0
}
for i := rl.pos + 1; i < len(rl.line); i++ {
if rl.line[i] == '{' {
return i - rl.pos
}
}
return 0
}
func (rl *Instance) viJumpBracket() (adjust int) {
split, index, pos := tokeniseBrackets(rl.line, rl.pos)
switch {
case len(split) == 0:
return
case pos == 0:
adjust = len(split[index])
default:
adjust = pos * -1
}
return
}