fix editor

49 files changed, 5177 insertions, 3697 deletions

diff --git a/vendor/github.com/go-errors/errors/README.md b/vendor/github.com/go-errors/errors/README.md
index d03882f1b..2ee13f117 100644
--- a/vendor/github.com/go-errors/errors/README.md
+++ b/vendor/github.com/go-errors/errors/README.md
@@ -78,3 +78,4 @@ This package is licensed under the MIT license, see LICENSE.MIT for details.
 >.  errors.AsError(errors.Wrap(err)).ErrorStack()
 > ```
 * v1.4.0 *BREAKING* v1.4.0 reverted all changes from v1.3.0 and is identical to v1.2.0
+* v1.4.1 no code change, but now without an unnecessary cover.out file.
diff --git a/vendor/github.com/go-errors/errors/cover.out b/vendor/github.com/go-errors/errors/cover.out
deleted file mode 100644
index ab18b0519..000000000
--- a/vendor/github.com/go-errors/errors/cover.out
+++ /dev/null
@@ -1,89 +0,0 @@
-mode: set
-github.com/go-errors/errors/stackframe.go:27.51,30.25 2 1
-github.com/go-errors/errors/stackframe.go:33.2,38.8 3 1
-github.com/go-errors/errors/stackframe.go:30.25,32.3 1 0
-github.com/go-errors/errors/stackframe.go:43.47,44.31 1 1
-github.com/go-errors/errors/stackframe.go:47.2,47.48 1 1
-github.com/go-errors/errors/stackframe.go:44.31,46.3 1 1
-github.com/go-errors/errors/stackframe.go:52.42,56.16 3 1
-github.com/go-errors/errors/stackframe.go:60.2,60.60 1 1
-github.com/go-errors/errors/stackframe.go:56.16,58.3 1 0
-github.com/go-errors/errors/stackframe.go:64.55,67.16 2 1
-github.com/go-errors/errors/stackframe.go:71.2,72.61 2 1
-github.com/go-errors/errors/stackframe.go:76.2,76.66 1 1
-github.com/go-errors/errors/stackframe.go:67.16,69.3 1 0
-github.com/go-errors/errors/stackframe.go:72.61,74.3 1 0
-github.com/go-errors/errors/stackframe.go:79.56,91.63 3 1
-github.com/go-errors/errors/stackframe.go:95.2,95.53 1 1
-github.com/go-errors/errors/stackframe.go:100.2,101.18 2 1
-github.com/go-errors/errors/stackframe.go:91.63,94.3 2 1
-github.com/go-errors/errors/stackframe.go:95.53,98.3 2 1
-github.com/go-errors/errors/error.go:70.32,73.23 2 1
-github.com/go-errors/errors/error.go:80.2,85.3 3 1
-github.com/go-errors/errors/error.go:74.2,75.10 1 1
-github.com/go-errors/errors/error.go:76.2,77.28 1 1
-github.com/go-errors/errors/error.go:92.43,95.23 2 1
-github.com/go-errors/errors/error.go:104.2,109.3 3 1
-github.com/go-errors/errors/error.go:96.2,97.11 1 1
-github.com/go-errors/errors/error.go:98.2,99.10 1 1
-github.com/go-errors/errors/error.go:100.2,101.28 1 1
-github.com/go-errors/errors/error.go:115.39,117.19 1 1
-github.com/go-errors/errors/error.go:121.2,121.29 1 1
-github.com/go-errors/errors/error.go:125.2,125.43 1 1
-github.com/go-errors/errors/error.go:129.2,129.14 1 1
-github.com/go-errors/errors/error.go:117.19,119.3 1 1
-github.com/go-errors/errors/error.go:121.29,123.3 1 1
-github.com/go-errors/errors/error.go:125.43,127.3 1 1
-github.com/go-errors/errors/error.go:135.53,137.2 1 1
-github.com/go-errors/errors/error.go:140.34,142.2 1 1
-github.com/go-errors/errors/error.go:146.34,149.42 2 1
-github.com/go-errors/errors/error.go:153.2,153.20 1 1
-github.com/go-errors/errors/error.go:149.42,151.3 1 1
-github.com/go-errors/errors/error.go:158.39,160.2 1 1
-github.com/go-errors/errors/error.go:164.46,165.23 1 1
-github.com/go-errors/errors/error.go:173.2,173.19 1 1
-github.com/go-errors/errors/error.go:165.23,168.32 2 1
-github.com/go-errors/errors/error.go:168.32,170.4 1 1
-github.com/go-errors/errors/error.go:177.37,178.42 1 1
-github.com/go-errors/errors/error.go:181.2,181.41 1 1
-github.com/go-errors/errors/error.go:178.42,180.3 1 1
-github.com/go-errors/errors/parse_panic.go:10.39,12.2 1 1
-github.com/go-errors/errors/parse_panic.go:16.46,24.34 5 1
-github.com/go-errors/errors/parse_panic.go:70.2,70.43 1 1
-github.com/go-errors/errors/parse_panic.go:73.2,73.55 1 0
-github.com/go-errors/errors/parse_panic.go:24.34,27.23 2 1
-github.com/go-errors/errors/parse_panic.go:27.23,28.42 1 1
-github.com/go-errors/errors/parse_panic.go:28.42,31.5 2 1
-github.com/go-errors/errors/parse_panic.go:31.6,33.5 1 0
-github.com/go-errors/errors/parse_panic.go:35.5,35.29 1 1
-github.com/go-errors/errors/parse_panic.go:35.29,36.86 1 1
-github.com/go-errors/errors/parse_panic.go:36.86,38.5 1 1
-github.com/go-errors/errors/parse_panic.go:40.5,40.32 1 1
-github.com/go-errors/errors/parse_panic.go:40.32,41.18 1 1
-github.com/go-errors/errors/parse_panic.go:45.4,46.46 2 1
-github.com/go-errors/errors/parse_panic.go:51.4,53.23 2 1
-github.com/go-errors/errors/parse_panic.go:57.4,58.18 2 1
-github.com/go-errors/errors/parse_panic.go:62.4,63.17 2 1
-github.com/go-errors/errors/parse_panic.go:41.18,43.10 2 1
-github.com/go-errors/errors/parse_panic.go:46.46,49.5 2 1
-github.com/go-errors/errors/parse_panic.go:53.23,55.5 1 0
-github.com/go-errors/errors/parse_panic.go:58.18,60.5 1 0
-github.com/go-errors/errors/parse_panic.go:63.17,65.10 2 1
-github.com/go-errors/errors/parse_panic.go:70.43,72.3 1 1
-github.com/go-errors/errors/parse_panic.go:80.85,82.29 2 1
-github.com/go-errors/errors/parse_panic.go:85.2,85.15 1 1
-github.com/go-errors/errors/parse_panic.go:88.2,90.63 2 1
-github.com/go-errors/errors/parse_panic.go:94.2,94.53 1 1
-github.com/go-errors/errors/parse_panic.go:99.2,101.36 2 1
-github.com/go-errors/errors/parse_panic.go:105.2,106.15 2 1
-github.com/go-errors/errors/parse_panic.go:109.2,112.49 3 1
-github.com/go-errors/errors/parse_panic.go:116.2,117.16 2 1
-github.com/go-errors/errors/parse_panic.go:121.2,126.8 1 1
-github.com/go-errors/errors/parse_panic.go:82.29,84.3 1 0
-github.com/go-errors/errors/parse_panic.go:85.15,87.3 1 1
-github.com/go-errors/errors/parse_panic.go:90.63,93.3 2 1
-github.com/go-errors/errors/parse_panic.go:94.53,97.3 2 1
-github.com/go-errors/errors/parse_panic.go:101.36,103.3 1 0
-github.com/go-errors/errors/parse_panic.go:106.15,108.3 1 0
-github.com/go-errors/errors/parse_panic.go:112.49,114.3 1 1
-github.com/go-errors/errors/parse_panic.go:117.16,119.3 1 0
diff --git a/vendor/github.com/jesseduffield/gocui/edit.go b/vendor/github.com/jesseduffield/gocui/edit.go
index a169e563b..243a59663 100644
--- a/vendor/github.com/jesseduffield/gocui/edit.go
+++ b/vendor/github.com/jesseduffield/gocui/edit.go
@@ -6,14 +6,8 @@ package gocui
 
 import (
 	"unicode"
-
-	"github.com/go-errors/errors"
-
-	"github.com/mattn/go-runewidth"
 )
 
-const maxInt = int(^uint(0) >> 1)
-
 // Editor interface must be satisfied by gocui editors.
 type Editor interface {
 	Edit(v *View, key Key, ch rune, mod Modifier) bool
@@ -34,467 +28,40 @@ var DefaultEditor Editor = EditorFunc(simpleEditor)
 
 // simpleEditor is used as the default gocui editor.
 func simpleEditor(v *View, key Key, ch rune, mod Modifier) bool {
-	matched := true
-
 	switch {
-	case ch != 0 && mod == 0:
-		v.EditWrite(ch)
-	case key == KeySpace:
-		v.EditWrite(' ')
 	case key == KeyBackspace || key == KeyBackspace2:
-		v.EditDelete(true)
+		v.TextArea.BackSpaceChar()
 	case key == KeyCtrlD || key == KeyDelete:
-		v.EditDelete(false)
-	case key == KeyInsert:
-		v.Overwrite = !v.Overwrite
+		v.TextArea.DeleteChar()
 	case key == KeyArrowDown:
-		v.MoveCursor(0, 1, false)
+		v.TextArea.MoveCursorDown()
 	case key == KeyArrowUp:
-		v.MoveCursor(0, -1, false)
+		v.TextArea.MoveCursorUp()
 	case key == KeyArrowLeft:
-		v.MoveCursor(-1, 0, false)
+		v.TextArea.MoveCursorLeft()
 	case key == KeyArrowRight:
-		v.MoveCursor(1, 0, false)
+		v.TextArea.MoveCursorRight()
 	case key == KeyEnter:
-		v.EditNewLine()
+		v.TextArea.TypeRune('\n')
+	case key == KeySpace:
+		v.TextArea.TypeRune(' ')
+	case key == KeyInsert:
+		v.TextArea.ToggleOverwrite()
 	case key == KeyCtrlU:
-		v.EditDeleteToStartOfLine()
+		v.TextArea.DeleteToStartOfLine()
 	case key == KeyCtrlA:
-		v.EditGotoToStartOfLine()
+		v.TextArea.GoToStartOfLine()
 	case key == KeyCtrlE:
-		v.EditGotoToEndOfLine()
-		matched = true
+		v.TextArea.GoToEndOfLine()
 
-	// TODO: see if we need all three of these conditions: maybe the final one is sufficient
+		// TODO: see if we need all three of these conditions: maybe the final one is sufficient
 	case ch != 0 && mod == 0 && unicode.IsPrint(ch):
-		v.EditWrite(ch)
+		v.TextArea.TypeRune(ch)
 	default:
-		matched = false
-	}
-
-	return matched
-}
-
-// EditWrite writes a rune at the cursor position.
-func (v *View) EditWrite(ch rune) {
-	w := runewidth.RuneWidth(ch)
-	if w == 0 {
-		return
-	}
-
-	v.writeRune(v.cx, v.cy, ch)
-	v.moveCursor(w, 0, true)
-}
-
-func (v *View) EditWriteString(str string) {
-	for _, ch := range str {
-		v.EditWrite(ch)
-	}
-}
-
-func (v *View) SetEditorContent(content string) error {
-	v.Clear()
-	if err := v.SetOrigin(0, 0); err != nil {
-		return err
-	}
-	if err := v.SetCursor(0, 0); err != nil {
-		return err
-	}
-	v.EditWriteString(content)
-	return nil
-}
-
-// EditDeleteToStartOfLine is the equivalent of pressing ctrl+U in your terminal, it deletes to the start of the line. Or if you are already at the start of the line, it deletes the newline character
-func (v *View) EditDeleteToStartOfLine() {
-	x, _ := v.Cursor()
-	if x == 0 {
-		v.EditDelete(true)
-	} else {
-		// delete characters until we are the start of the line
-		for x > 0 {
-			v.EditDelete(true)
-			x, _ = v.Cursor()
-		}
-	}
-}
-
-// EditGotoToStartOfLine takes you to the start of the current line
-func (v *View) EditGotoToStartOfLine() {
-	x, _ := v.Cursor()
-	for x > 0 {
-		v.MoveCursor(-1, 0, false)
-		x, _ = v.Cursor()
-	}
-}
-
-// EditGotoToEndOfLine takes you to the end of the line
-func (v *View) EditGotoToEndOfLine() {
-	_, y := v.Cursor()
-	_ = v.SetCursor(0, y+1)
-	x, newY := v.Cursor()
-	if newY == y {
-		// we must be on the last line, so lets move to the very end
-		prevX := -1
-		for prevX != x {
-			prevX = x
-			v.MoveCursor(1, 0, false)
-			x, _ = v.Cursor()
-		}
-	} else {
-		// most left so now we're at the end of the original line
-		v.MoveCursor(-1, 0, false)
-	}
-}
-
-// EditDelete deletes a rune at the cursor position. back determines the
-// direction.
-func (v *View) EditDelete(back bool) {
-	v.writeMutex.Lock()
-	defer v.writeMutex.Unlock()
-
-	x, y := v.ox+v.cx, v.oy+v.cy
-	if y < 0 {
-		return
-	} else if y >= len(v.viewLines) {
-		v.MoveCursor(-1, 0, true)
-		return
-	}
-
-	maxX, _ := v.Size()
-	if back {
-		if x == 0 { // start of the line
-			if y < 1 {
-				return
-			}
-
-			var maxPrevWidth int
-			if v.Wrap {
-				maxPrevWidth = maxX
-			} else {
-				maxPrevWidth = maxInt
-			}
-
-			if v.viewLines[y].linesX == 0 { // regular line
-				v.mergeLines(v.cy - 1)
-				if len(v.viewLines[y-1].line) < maxPrevWidth {
-					v.MoveCursor(-1, 0, true)
-				}
-			} else { // wrapped line
-				n, _ := v.deleteRune(len(v.viewLines[y-1].line)-1, v.cy-1)
-				v.MoveCursor(-n, 0, true)
-			}
-		} else { // middle/end of the line
-			n, _ := v.deleteRune(v.cx-1, v.cy)
-			v.MoveCursor(-n, 0, true)
-		}
-	} else {
-		if x == len(v.viewLines[y].line) { // end of the line
-			v.mergeLines(v.cy)
-		} else { // start/middle of the line
-			v.deleteRune(v.cx, v.cy)
-		}
-	}
-}
-
-// EditNewLine inserts a new line under the cursor.
-func (v *View) EditNewLine() {
-	v.writeMutex.Lock()
-	defer v.writeMutex.Unlock()
-
-	v.breakLine(v.cx, v.cy)
-	v.ox = 0
-	v.cy = v.cy + 1
-	v.cx = 0
-}
-
-// MoveCursor moves the cursor taking into account the width of the line/view,
-// displacing the origin if necessary.
-func (v *View) MoveCursor(dx, dy int, writeMode bool) {
-	ox, oy := v.cx+v.ox, v.cy+v.oy
-	x, y := ox+dx, oy+dy
-
-	if y < 0 || y >= len(v.viewLines) {
-		v.moveCursor(dx, dy, writeMode)
-		return
-	}
-
-	// Removing newline.
-	if x < 0 {
-		var prevLen int
-		if y-1 >= 0 && y-1 < len(v.viewLines) {
-			prevLen = lineWidth(v.viewLines[y-1].line)
-		}
-
-		v.MoveCursor(prevLen, -1, writeMode)
-		return
-	}
-
-	line := v.viewLines[y].line
-	var col int
-	var prevCol int
-	for i := range line {
-		prevCol = col
-		col += runewidth.RuneWidth(line[i].chr)
-		if dx > 0 {
-			if x <= col {
-				x = col
-				break
-			}
-			continue
-		}
-
-		if x < col {
-			x = prevCol
-			break
-		}
-	}
-
-	v.moveCursor(x-ox, y-oy, writeMode)
-}
-
-func (v *View) moveCursor(dx, dy int, writeMode bool) {
-	maxX, maxY := v.Size()
-	cx, cy := v.cx+dx, v.cy+dy
-	x, y := v.ox+cx, v.oy+cy
-
-	var curLineWidth, prevLineWidth int
-	// get the width of the current line
-	curLineWidth = maxInt
-	if v.Wrap {
-		curLineWidth = maxX - 1
-	}
-
-	if !writeMode {
-		curLineWidth = 0
-		if y >= 0 && y < len(v.viewLines) {
-			curLineWidth = lineWidth(v.viewLines[y].line)
-			if v.Wrap && curLineWidth >= maxX {
-				curLineWidth = maxX - 1
-			}
-		}
-	}
-	// get the width of the previous line
-	prevLineWidth = 0
-	if y-1 >= 0 && y-1 < len(v.viewLines) {
-		prevLineWidth = lineWidth(v.viewLines[y-1].line)
-	}
-	// adjust cursor's x position and view's x origin
-	if x > curLineWidth { // move to next line
-		if dx > 0 { // horizontal movement
-			cy++
-			if writeMode || v.oy+cy < len(v.viewLines) {
-				if !v.Wrap {
-					v.ox = 0
-				}
-				v.cx = 0
-			}
-		} else { // vertical movement
-			if curLineWidth > 0 { // move cursor to the EOL
-				if v.Wrap {
-					v.cx = curLineWidth
-				} else {
-					ncx := curLineWidth - v.ox
-					if ncx < 0 {
-						v.ox += ncx
-						if v.ox < 0 {
-							v.ox = 0
-						}
-						v.cx = 0
-					} else {
-						v.cx = ncx
-					}
-				}
-			} else {
-				if writeMode || v.oy+cy < len(v.viewLines) {
-					if !v.Wrap {
-						v.ox = 0
-					}
-					v.cx = 0
-				}
-			}
-		}
-	} else if cx < 0 {
-		if !v.Wrap && v.ox > 0 { // move origin to the left
-			v.ox += cx
-			v.cx = 0
-		} else { // move to previous line
-			cy--
-			if prevLineWidth > 0 {
-				if !v.Wrap { // set origin so the EOL is visible
-					nox := prevLineWidth - maxX + 1
-					if nox < 0 {
-						nox = 0
-					}
-					v.ox = nox
-				}
-				v.cx = prevLineWidth
-			} else {
-				if !v.Wrap {
-					v.ox = 0
-				}
-				v.cx = 0
-			}
-		}
-	} else { // stay on the same line
-		if v.Wrap {
-			v.cx = cx
-		} else {
-			if cx >= maxX {
-				v.ox += cx - maxX + 1
-				v.cx = maxX
-			} else {
-				v.cx = cx
-			}
-		}
-	}
-
-	// adjust cursor's y position and view's y origin
-	if cy < 0 {
-		if v.oy > 0 {
-			v.oy--
-		}
-	} else if writeMode || v.oy+cy < len(v.viewLines) {
-		if cy >= maxY {
-			v.oy++
-		} else {
-			v.cy = cy
-		}
-	}
-}
-
-// writeRune writes a rune into the view's internal buffer, at the
-// position corresponding to the point (x, y). The length of the internal
-// buffer is increased if the point is out of bounds. Overwrite mode is
-// governed by the value of View.overwrite.
-func (v *View) writeRune(x, y int, ch rune) error {
-	v.writeMutex.Lock()
-	defer v.writeMutex.Unlock()
-
-	v.tainted = true
-
-	x, y, err := v.realPosition(x, y)
-	if err != nil {
-		return err
-	}
-
-	if x < 0 || y < 0 {
-		return errors.New("invalid point")
-	}
-
-	if y >= len(v.lines) {
-		s := make([][]cell, y-len(v.lines)+1)
-		v.lines = append(v.lines, s...)
-	}
-
-	olen := len(v.lines[y])
-	w := runewidth.RuneWidth(ch)
-
-	var s []cell
-	if x >= len(v.lines[y]) {
-		s = make([]cell, x-len(v.lines[y])+w)
-	} else if !v.Overwrite {
-		s = make([]cell, w)
-	}
-	v.lines[y] = append(v.lines[y], s...)
-
-	if !v.Overwrite || (v.Overwrite && x >= olen-w) {
-		copy(v.lines[y][x+w:], v.lines[y][x:])
-	}
-	v.lines[y][x] = cell{
-		fgColor: v.FgColor,
-		bgColor: v.BgColor,
-		chr:     ch,
-	}
-
-	for i := 1; i < w; i++ {
-		v.lines[y][x+i] = cell{
-			fgColor: v.FgColor,
-			bgColor: v.BgColor,
-			chr:     '\x00',
-		}
+		return false
 	}
 
-	return nil
-}
-
-// deleteRune removes a rune from the view's internal buffer, at the
-// position corresponding to the point (x, y).
-// returns the amount of columns that where removed.
-func (v *View) deleteRune(x, y int) (int, error) {
-	v.tainted = true
-
-	x, y, err := v.realPosition(x, y)
-	if err != nil {
-		return 0, err
-	}
-
-	if x < 0 || y < 0 || y >= len(v.lines) || x >= len(v.lines[y]) {
-		return 0, errors.New("invalid point")
-	}
-
-	var tw int
-	for i := range v.lines[y] {
-		w := runewidth.RuneWidth(v.lines[y][i].chr)
-		tw += w
-		if tw > x {
-			v.lines[y] = append(v.lines[y][:i], v.lines[y][i+w:]...)
-			return w, nil
-		}
-
-	}
-
-	return 0, nil
-}
-
-// mergeLines merges the lines "y" and "y+1" if possible.
-func (v *View) mergeLines(y int) error {
-	v.clearViewLines()
-
-	_, y, err := v.realPosition(0, y)
-	if err != nil {
-		return err
-	}
-
-	if y < 0 || y >= len(v.lines) {
-		return errors.New("invalid point")
-	}
-
-	if y < len(v.lines)-1 { // otherwise we don't need to merge anything
-		v.lines[y] = append(v.lines[y], v.lines[y+1]...)
-		v.lines = append(v.lines[:y+1], v.lines[y+2:]...)
-	}
-	return nil
-}
-
-// breakLine breaks a line of the internal buffer at the position corresponding
-// to the point (x, y).
-func (v *View) breakLine(x, y int) error {
-	v.tainted = true
-
-	x, y, err := v.realPosition(x, y)
-	if err != nil {
-		return err
-	}
-
-	if y < 0 || y >= len(v.lines) {
-		return errors.New("invalid point")
-	}
-
-	var left, right []cell
-	if x < len(v.lines[y]) { // break line
-		left = make([]cell, le