cmd/micro/view.go

   1 package main
   2
   3 import (
   4         "io/ioutil"
   5         "strconv"
   6         "strings"
   7         "time"
   8
   9         "github.com/mattn/go-runewidth"
  10         "github.com/mitchellh/go-homedir"
  11         "github.com/zyedidia/tcell"
  12 )
  13
  14 type ViewType int
  15
  16 const (
  17         vtDefault ViewType = iota
  18         vtHelp
  19         vtLog
  20 )
  21
  22 // The View struct stores information about a view into a buffer.
  23 // It stores information about the cursor, and the viewport
  24 // that the user sees the buffer from.
  25 type View struct {
  26         // A pointer to the buffer's cursor for ease of access
  27         Cursor *Cursor
  28
  29         // The topmost line, used for vertical scrolling
  30         Topline    int
  31         Bottomline int
  32         // The leftmost column, used for horizontal scrolling
  33         leftCol int
  34
  35         // Percentage of the terminal window that this view takes up (from 0 to 100)
  36         widthPercent  int
  37         heightPercent int
  38
  39         // Specifies whether or not this view holds a help buffer
  40         Type ViewType
  41
  42         // Actual width and height
  43         width  int
  44         height int
  45
  46         // Where this view is located
  47         x, y int
  48
  49         // How much to offset because of line numbers
  50         lineNumOffset int
  51
  52         // Holds the list of gutter messages
  53         messages map[string][]GutterMessage
  54
  55         // This is the index of this view in the views array
  56         Num int
  57         // What tab is this view stored in
  58         TabNum int
  59
  60         // The buffer
  61         Buf *Buffer
  62         // The statusline
  63         sline Statusline
  64
  65         // Since tcell doesn't differentiate between a mouse release event
  66         // and a mouse move event with no keys pressed, we need to keep
  67         // track of whether or not the mouse was pressed (or not released) last event to determine
  68         // mouse release events
  69         mouseReleased bool
  70
  71         // This stores when the last click was
  72         // This is useful for detecting double and triple clicks
  73         lastClickTime time.Time
  74
  75         // lastCutTime stores when the last ctrl+k was issued.
  76         // It is used for clearing the clipboard to replace it with fresh cut lines.
  77         lastCutTime time.Time
  78
  79         // freshClip returns true if the clipboard has never been pasted.
  80         freshClip bool
  81
  82         // Was the last mouse event actually a double click?
  83         // Useful for detecting triple clicks -- if a double click is detected
  84         // but the last mouse event was actually a double click, it's a triple click
  85         doubleClick bool
  86         // Same here, just to keep track for mouse move events
  87         tripleClick bool
  88
  89         // Syntax highlighting matches
  90         matches SyntaxMatches
  91
  92         splitNode *LeafNode
  93 }
  94
  95 // NewView returns a new fullscreen view
  96 func NewView(buf *Buffer) *View {
  97         screenW, screenH := screen.Size()
  98         return NewViewWidthHeight(buf, screenW, screenH)
  99 }
 100
 101 // NewViewWidthHeight returns a new view with the specified width and height
 102 // Note that w and h are raw column and row values
 103 func NewViewWidthHeight(buf *Buffer, w, h int) *View {
 104         v := new(View)
 105
 106         v.x, v.y = 0, 0
 107
 108         v.width = w
 109         v.height = h
 110
 111         v.ToggleTabbar()
 112
 113         v.OpenBuffer(buf)
 114
 115         v.messages = make(map[string][]GutterMessage)
 116
 117         v.sline = Statusline{
 118                 view: v,
 119         }
 120
 121         if v.Buf.Settings["statusline"].(bool) {
 122                 v.height--
 123         }
 124
 125         for _, pl := range loadedPlugins {
 126                 _, err := Call(pl+".onViewOpen", v)
 127                 if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
 128                         TermMessage(err)
 129                         continue
 130                 }
 131         }
 132
 133         return v
 134 }
 135
 136 func (v *View) ToggleStatusLine() {
 137         if v.Buf.Settings["statusline"].(bool) {
 138                 v.height--
 139         } else {
 140                 v.height++
 141         }
 142 }
 143
 144 func (v *View) ToggleTabbar() {
 145         if len(tabs) > 1 {
 146                 if v.y == 0 {
 147                         // Include one line for the tab bar at the top
 148                         v.height--
 149                         v.y = 1
 150                 }
 151         } else {
 152                 if v.y == 1 {
 153                         v.y = 0
 154                         v.height++
 155                 }
 156         }
 157 }
 158
 159 func (v *View) paste(clip string) {
 160         leadingWS := GetLeadingWhitespace(v.Buf.Line(v.Cursor.Y))
 161
 162         if v.Cursor.HasSelection() {
 163                 v.Cursor.DeleteSelection()
 164                 v.Cursor.ResetSelection()
 165         }
 166         clip = strings.Replace(clip, "\n", "\n"+leadingWS, -1)
 167         v.Buf.Insert(v.Cursor.Loc, clip)
 168         v.Cursor.Loc = v.Cursor.Loc.Move(Count(clip), v.Buf)
 169         v.freshClip = false
 170         messenger.Message("Pasted clipboard")
 171 }
 172
 173 // ScrollUp scrolls the view up n lines (if possible)
 174 func (v *View) ScrollUp(n int) {
 175         // Try to scroll by n but if it would overflow, scroll by 1
 176         if v.Topline-n >= 0 {
 177                 v.Topline -= n
 178         } else if v.Topline > 0 {
 179                 v.Topline--
 180         }
 181 }
 182
 183 // ScrollDown scrolls the view down n lines (if possible)
 184 func (v *View) ScrollDown(n int) {
 185         // Try to scroll by n but if it would overflow, scroll by 1
 186         if v.Topline+n <= v.Buf.NumLines-v.height {
 187                 v.Topline += n
 188         } else if v.Topline < v.Buf.NumLines-v.height {
 189                 v.Topline++
 190         }
 191 }
 192
 193 // CanClose returns whether or not the view can be closed
 194 // If there are unsaved changes, the user will be asked if the view can be closed
 195 // causing them to lose the unsaved changes
 196 func (v *View) CanClose() bool {
 197         if v.Type == vtDefault && v.Buf.IsModified {
 198                 var char rune
 199                 var canceled bool
 200                 if v.Buf.Settings["autosave"].(bool) {
 201                         char = 'y'
 202                 } else {
 203                         char, canceled = messenger.LetterPrompt("Save changes to "+v.Buf.Name+" before closing? (y,n,esc) ", 'y', 'n')
 204                 }
 205                 if !canceled {
 206                         if char == 'y' {
 207                                 v.Save(true)
 208                                 return true
 209                         } else if char == 'n' {
 210                                 return true
 211                         }
 212                 }
 213         } else {
 214                 return true
 215         }
 216         return false
 217 }
 218
 219 // OpenBuffer opens a new buffer in this view.
 220 // This resets the topline, event handler and cursor.
 221 func (v *View) OpenBuffer(buf *Buffer) {
 222         screen.Clear()
 223         v.CloseBuffer()
 224         v.Buf = buf
 225         v.Cursor = &buf.Cursor
 226         v.Topline = 0
 227         v.leftCol = 0
 228         v.Cursor.ResetSelection()
 229         v.Relocate()
 230         v.Center(false)
 231         v.messages = make(map[string][]GutterMessage)
 232
 233         v.matches = Match(v)
 234
 235         // Set mouseReleased to true because we assume the mouse is not being pressed when
 236         // the editor is opened
 237         v.mouseReleased = true
 238         v.lastClickTime = time.Time{}
 239 }
 240
 241 func (v *View) Open(filename string) {
 242         home, _ := homedir.Dir()
 243         filename = strings.Replace(filename, "~", home, 1)
 244         file, err := ioutil.ReadFile(filename)
 245
 246         var buf *Buffer
 247         if err != nil {
 248                 messenger.Message(err.Error())
 249                 // File does not exist -- create an empty buffer with that name
 250                 buf = NewBuffer([]byte{}, filename)
 251         } else {
 252                 buf = NewBuffer(file, filename)
 253         }
 254         v.OpenBuffer(buf)
 255 }
 256
 257 // CloseBuffer performs any closing functions on the buffer
 258 func (v *View) CloseBuffer() {
 259         if v.Buf != nil {
 260                 v.Buf.Serialize()
 261         }
 262 }
 263
 264 // ReOpen reloads the current buffer
 265 func (v *View) ReOpen() {
 266         if v.CanClose() {
 267                 screen.Clear()
 268                 v.Buf.ReOpen()
 269                 v.Relocate()
 270                 v.matches = Match(v)
 271         }
 272 }
 273
 274 // HSplit opens a horizontal split with the given buffer
 275 func (v *View) HSplit(buf *Buffer) bool {
 276         v.splitNode.HSplit(buf)
 277         tabs[v.TabNum].Resize()
 278         return false
 279 }
 280
 281 // VSplit opens a vertical split with the given buffer
 282 func (v *View) VSplit(buf *Buffer) bool {
 283         v.splitNode.VSplit(buf)
 284         tabs[v.TabNum].Resize()
 285         return false
 286 }
 287
 288 // Relocate moves the view window so that the cursor is in view
 289 // This is useful if the user has scrolled far away, and then starts typing
 290 func (v *View) Relocate() bool {
 291         height := v.Bottomline - v.Topline
 292         ret := false
 293         cy := v.Cursor.Y
 294         scrollmargin := int(v.Buf.Settings["scrollmargin"].(float64))
 295         if cy < v.Topline+scrollmargin && cy > scrollmargin-1 {
 296                 v.Topline = cy - scrollmargin
 297                 ret = true
 298         } else if cy < v.Topline {
 299                 v.Topline = cy
 300                 ret = true
 301         }
 302         if cy > v.Topline+height-1-scrollmargin && cy < v.Buf.NumLines-scrollmargin {
 303                 v.Topline = cy - height + 1 + scrollmargin
 304                 ret = true
 305         } else if cy >= v.Buf.NumLines-scrollmargin && cy > height {
 306                 v.Topline = v.Buf.NumLines - height
 307                 ret = true
 308         }
 309
 310         if !v.Buf.Settings["softwrap"].(bool) {
 311                 cx := v.Cursor.GetVisualX()
 312                 if cx < v.leftCol {
 313                         v.leftCol = cx
 314                         ret = true
 315                 }
 316                 if cx+v.lineNumOffset+1 > v.leftCol+v.width {
 317                         v.leftCol = cx - v.width + v.lineNumOffset + 1
 318                         ret = true
 319                 }
 320         }
 321         return ret
 322 }
 323
 324 // MoveToMouseClick moves the cursor to location x, y assuming x, y were given
 325 // by a mouse click
 326 func (v *View) MoveToMouseClick(x, y int) {
 327         if y-v.Topline > v.height-1 {
 328                 v.ScrollDown(1)
 329                 y = v.height + v.Topline - 1
 330         }
 331         if y >= v.Buf.NumLines {
 332                 y = v.Buf.NumLines - 1
 333         }
 334         if y < 0 {
 335                 y = 0
 336         }
 337         if x < 0 {
 338                 x = 0
 339         }
 340
 341         x = v.Cursor.GetCharPosInLine(y, x)
 342         if x > Count(v.Buf.Line(y)) {
 343                 x = Count(v.Buf.Line(y))
 344         }
 345         v.Cursor.X = x
 346         v.Cursor.Y = y
 347         v.Cursor.LastVisualX = v.Cursor.GetVisualX()
 348 }
 349
 350 // HandleEvent handles an event passed by the main loop
 351 func (v *View) HandleEvent(event tcell.Event) {
 352         // This bool determines whether the view is relocated at the end of the function
 353         // By default it's true because most events should cause a relocate
 354         relocate := true
 355
 356         v.Buf.CheckModTime()
 357
 358         switch e := event.(type) {
 359         case *tcell.EventResize:
 360                 // Window resized
 361                 tabs[v.TabNum].Resize()
 362         case *tcell.EventKey:
 363                 // Check first if input is a key binding, if it is we 'eat' the input and don't insert a rune
 364                 isBinding := false
 365                 if e.Key() != tcell.KeyRune || e.Modifiers() != 0 {
 366                         for key, actions := range bindings {
 367                                 if e.Key() == key.keyCode {
 368                                         if e.Key() == tcell.KeyRune {
 369                                                 if e.Rune() != key.r {
 370                                                         continue
 371                                                 }
 372                                         }
 373                                         if e.Modifiers() == key.modifiers {
 374                                                 relocate = false
 375                                                 isBinding = true
 376                                                 for _, action := range actions {
 377                                                         relocate = action(v, true) || relocate
 378                                                         funcName := FuncName(action)
 379                                                         if funcName != "main.(*View).ToggleMacro" && funcName != "main.(*View).PlayMacro" {
 380                                                                 if recordingMacro {
 381                                                                         curMacro = append(curMacro, action)
 382                                                                 }
 383                                                         }
 384                                                 }
 385                                                 break
 386                                         }
 387                                 }
 388                         }
 389                 }
 390                 if !isBinding && e.Key() == tcell.KeyRune {
 391                         // Insert a character
 392                         if v.Cursor.HasSelection() {
 393                                 v.Cursor.DeleteSelection()
 394                                 v.Cursor.ResetSelection()
 395                         }
 396                         v.Buf.Insert(v.Cursor.Loc, string(e.Rune()))
 397                         v.Cursor.Right()
 398
 399                         for _, pl := range loadedPlugins {
 400                                 _, err := Call(pl+".onRune", string(e.Rune()), v)
 401                                 if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
 402                                         TermMessage(err)
 403                                 }
 404                         }
 405
 406                         if recordingMacro {
 407                                 curMacro = append(curMacro, e.Rune())
 408                         }
 409                 }
 410         case *tcell.EventPaste:
 411                 if !PreActionCall("Paste", v) {
 412                         break
 413                 }
 414
 415                 leadingWS := GetLeadingWhitespace(v.Buf.Line(v.Cursor.Y))
 416
 417                 if v.Cursor.HasSelection() {
 418                         v.Cursor.DeleteSelection()
 419                         v.Cursor.ResetSelection()
 420                 }
 421                 clip := e.Text()
 422                 clip = strings.Replace(clip, "\n", "\n"+leadingWS, -1)
 423                 v.Buf.Insert(v.Cursor.Loc, clip)
 424                 v.Cursor.Loc = v.Cursor.Loc.Move(Count(clip), v.Buf)
 425                 v.freshClip = false
 426                 messenger.Message("Pasted clipboard")
 427
 428                 PostActionCall("Paste", v)
 429         case *tcell.EventMouse:
 430                 x, y := e.Position()
 431                 x -= v.lineNumOffset - v.leftCol + v.x
 432                 y += v.Topline - v.y
 433                 // Don't relocate for mouse events
 434                 relocate = false
 435
 436                 button := e.Buttons()
 437
 438                 switch button {
 439                 case tcell.Button1:
 440                         // Left click
 441                         if v.mouseReleased {
 442                                 v.MoveToMouseClick(x, y)
 443                                 if time.Since(v.lastClickTime)/time.Millisecond < doubleClickThreshold {
 444                                         if v.doubleClick {
 445                                                 // Triple click
 446                                                 v.lastClickTime = time.Now()
 447
 448                                                 v.tripleClick = true
 449                                                 v.doubleClick = false
 450
 451                                                 v.Cursor.SelectLine()
 452                                         } else {
 453                                                 // Double click
 454                                                 v.lastClickTime = time.Now()
 455
 456                                                 v.doubleClick = true
 457                                                 v.tripleClick = false
 458
 459                                                 v.Cursor.SelectWord()
 460                                         }
 461                                 } else {
 462                                         v.doubleClick = false
 463                                         v.tripleClick = false
 464                                         v.lastClickTime = time.Now()
 465
 466                                         v.Cursor.OrigSelection[0] = v.Cursor.Loc
 467                                         v.Cursor.CurSelection[0] = v.Cursor.Loc
 468                                         v.Cursor.CurSelection[1] = v.Cursor.Loc
 469                                 }
 470                                 v.mouseReleased = false
 471                         } else if !v.mouseReleased {
 472                                 v.MoveToMouseClick(x, y)
 473                                 if v.tripleClick {
 474                                         v.Cursor.AddLineToSelection()
 475                                 } else if v.doubleClick {
 476                                         v.Cursor.AddWordToSelection()
 477                                 } else {
 478                                         v.Cursor.SetSelectionEnd(v.Cursor.Loc)
 479                                 }
 480                         }
 481                 case tcell.Button2:
 482                         // Middle mouse button was clicked,
 483                         // We should paste primary
 484                         v.PastePrimary(true)
 485                 case tcell.ButtonNone:
 486                         // Mouse event with no click
 487                         if !v.mouseReleased {
 488                                 // Mouse was just released
 489
 490                                 // Relocating here isn't really necessary because the cursor will
 491                                 // be in the right place from the last mouse event
 492                                 // However, if we are running in a terminal that doesn't support mouse motion
 493                                 // events, this still allows the user to make selections, except only after they
 494                                 // release the mouse
 495
 496                                 if !v.doubleClick && !v.tripleClick {
 497                                         v.MoveToMouseClick(x, y)
 498                                         v.Cursor.SetSelectionEnd(v.Cursor.Loc)
 499                                 }
 500                                 v.mouseReleased = true
 501                         }
 502                 case tcell.WheelUp:
 503                         // Scroll up
 504                         scrollspeed := int(v.Buf.Settings["scrollspeed"].(float64))
 505                         v.ScrollUp(scrollspeed)
 506                 case tcell.WheelDown:
 507                         // Scroll down
 508                         scrollspeed := int(v.Buf.Settings["scrollspeed"].(float64))
 509                         v.ScrollDown(scrollspeed)
 510                 }
 511         }
 512
 513         if relocate {
 514                 v.Relocate()
 515         }
 516 }
 517
 518 // GutterMessage creates a message in this view's gutter
 519 func (v *View) GutterMessage(section string, lineN int, msg string, kind int) {
 520         lineN--
 521         gutterMsg := GutterMessage{
 522                 lineNum: lineN,
 523                 msg:     msg,
 524                 kind:    kind,
 525         }
 526         for _, v := range v.messages {
 527                 for _, gmsg := range v {
 528                         if gmsg.lineNum == lineN {
 529                                 return
 530                         }
 531                 }
 532         }
 533         messages := v.messages[section]
 534         v.messages[section] = append(messages, gutterMsg)
 535 }
 536
 537 // ClearGutterMessages clears all gutter messages from a given section
 538 func (v *View) ClearGutterMessages(section string) {
 539         v.messages[section] = []GutterMessage{}
 540 }
 541
 542 // ClearAllGutterMessages clears all the gutter messages
 543 func (v *View) ClearAllGutterMessages() {
 544         for k := range v.messages {
 545                 v.messages[k] = []GutterMessage{}
 546         }
 547 }
 548
 549 // Opens the given help page in a new horizontal split
 550 func (v *View) openHelp(helpPage string) {
 551         if data, err := FindRuntimeFile(RTHelp, helpPage).Data(); err != nil {
 552                 TermMessage("Unable to load help text", helpPage, "\n", err)
 553         } else {
 554                 helpBuffer := NewBuffer(data, helpPage+".md")
 555                 helpBuffer.Name = "Help"
 556
 557                 if v.Type == vtHelp {
 558                         v.OpenBuffer(helpBuffer)
 559                 } else {
 560                         v.HSplit(helpBuffer)
 561                         CurView().Type = vtHelp
 562                 }
 563         }
 564 }
 565
 566 func (v *View) drawCell(x, y int, ch rune, combc []rune, style tcell.Style) {
 567         if x >= v.x && x < v.x+v.width && y >= v.y && y < v.y+v.height {
 568                 screen.SetContent(x, y, ch, combc, style)
 569         }
 570 }
 571
 572 // DisplayView renders the view to the screen
 573 func (v *View) DisplayView() {
 574         if v.Type == vtLog {
 575                 // Log views should always follow the cursor...
 576                 v.Relocate()
 577         }
 578
 579         if v.Buf.Settings["syntax"].(bool) {
 580                 v.matches = Match(v)
 581         }
 582
 583         // The charNum we are currently displaying
 584         // starts at the start of the viewport
 585         charNum := Loc{0, v.Topline}
 586
 587         // Convert the length of buffer to a string, and get the length of the string
 588         // We are going to have to offset by that amount
 589         maxLineLength := len(strconv.Itoa(v.Buf.NumLines))
 590
 591         if v.Buf.Settings["ruler"] == true {
 592                 // + 1 for the little space after the line number
 593                 v.lineNumOffset = maxLineLength + 1
 594         } else {
 595                 v.lineNumOffset = 0
 596         }
 597
 598         // We need to add to the line offset if there are gutter messages
 599         var hasGutterMessages bool
 600         for _, v := range v.messages {
 601                 if len(v) > 0 {
 602                         hasGutterMessages = true
 603                 }
 604         }
 605         if hasGutterMessages {
 606                 v.lineNumOffset += 2
 607         }
 608
 609         if v.x != 0 {
 610                 // One space for the extra split divider
 611                 v.lineNumOffset++
 612         }
 613
 614         // These represent the current screen coordinates
 615         screenX, screenY := v.x, v.y-1
 616
 617         highlightStyle := defStyle
 618
 619         // ViewLine is the current line from the top of the viewport
 620         for viewLine := 0; viewLine < v.height; viewLine++ {
 621                 screenY++
 622                 screenX = v.x
 623
 624                 // This is the current line number of the buffer that we are drawing
 625                 curLineN := viewLine + v.Topline
 626
 627                 if screenY >= v.height {
 628                         v.Bottomline = curLineN
 629                         break
 630                 }
 631
 632                 if v.x != 0 {
 633                         // Draw the split divider
 634                         v.drawCell(screenX, screenY, '|', nil, defStyle.Reverse(true))
 635                         screenX++
 636                 }
 637
 638                 // If the buffer is smaller than the view height we have to clear all this space
 639                 if curLineN >= v.Buf.NumLines {
 640                         for i := screenX; i < v.x+v.width; i++ {
 641                                 v.drawCell(i, screenY, ' ', nil, defStyle)
 642                         }
 643
 644                         continue
 645                 }
 646                 line := v.Buf.Line(curLineN)
 647
 648                 // If there are gutter messages we need to display the '>>' symbol here
 649                 if hasGutterMessages {
 650                         // msgOnLine stores whether or not there is a gutter message on this line in particular
 651                         msgOnLine := false
 652                         for k := range v.messages {
 653                                 for _, msg := range v.messages[k] {
 654                                         if msg.lineNum == curLineN {
 655                                                 msgOnLine = true
 656                                                 gutterStyle := defStyle
 657                                                 switch msg.kind {
 658                                                 case GutterInfo:
 659                                                         if style, ok := colorscheme["gutter-info"]; ok {
 660                                                                 gutterStyle = style
 661                                                         }
 662                                                 case GutterWarning:
 663                                                         if style, ok := colorscheme["gutter-warning"]; ok {
 664                                                                 gutterStyle = style
 665                                                         }
 666                                                 case GutterError:
 667                                                         if style, ok := colorscheme["gutter-error"]; ok {
 668                                                                 gutterStyle = style
 669                                                         }
 670                                                 }
 671                                                 v.drawCell(screenX, screenY, '>', nil, gutterStyle)
 672                                                 screenX++
 673                                                 v.drawCell(screenX, screenY, '>', nil, gutterStyle)
 674                                                 screenX++
 675                                                 if v.Cursor.Y == curLineN && !messenger.hasPrompt {
 676                                                         messenger.Message(msg.msg)
 677                                                         messenger.gutterMessage = true
 678                                                 }
 679                                         }
 680                                 }
 681                         }
 682                         // If there is no message on this line we just display an empty offset
 683                         if !msgOnLine {
 684                                 v.drawCell(screenX, screenY, ' ', nil, defStyle)
 685                                 screenX++
 686                                 v.drawCell(screenX, screenY, ' ', nil, defStyle)
 687                                 screenX++
 688                                 if v.Cursor.Y == curLineN && messenger.gutterMessage {
 689                                         messenger.Reset()
 690                                         messenger.gutterMessage = false
 691                                 }
 692                         }
 693                 }
 694
 695                 lineNumStyle := defStyle
 696                 if v.Buf.Settings["ruler"] == true {
 697                         // Write the line number
 698                         if style, ok := colorscheme["line-number"]; ok {
 699                                 lineNumStyle = style
 700                         }
 701                         if style, ok := colorscheme["current-line-number"]; ok {
 702                                 if curLineN == v.Cursor.Y && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() {
 703                                         lineNumStyle = style
 704                                 }
 705                         }
 706
 707                         lineNum := strconv.Itoa(curLineN + 1)
 708
 709                         // Write the spaces before the line number if necessary
 710                         for i := 0; i < maxLineLength-len(lineNum); i++ {
 711                                 v.drawCell(screenX, screenY, ' ', nil, lineNumStyle)
 712                                 screenX++
 713                         }
 714                         // Write the actual line number
 715                         for _, ch := range lineNum {
 716                                 v.drawCell(screenX, screenY, ch, nil, lineNumStyle)
 717                                 screenX++
 718                         }
 719
 720                         // Write the extra space
 721                         v.drawCell(screenX, screenY, ' ', nil, lineNumStyle)
 722                         screenX++
 723                 }
 724
 725                 // Now we actually draw the line
 726                 colN := 0
 727                 strWidth := 0
 728                 tabSize := int(v.Buf.Settings["tabsize"].(float64))
 729                 for _, ch := range line {
 730                         if v.Buf.Settings["softwrap"].(bool) {
 731                                 if screenX-v.x >= v.width {
 732                                         screenY++
 733                                         for i := 0; i < v.lineNumOffset; i++ {
 734                                                 screen.SetContent(v.x+i, screenY, ' ', nil, lineNumStyle)
 735                                         }
 736                                         screenX = v.x + v.lineNumOffset
 737                                 }
 738                         }
 739
 740                         if tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN && colN == v.Cursor.X {
 741                                 v.DisplayCursor(screenX, screenY)
 742                         }
 743
 744                         lineStyle := defStyle
 745
 746                         if v.Buf.Settings["syntax"].(bool) {
 747                                 // Syntax highlighting is enabled
 748                                 highlightStyle = v.matches[viewLine][colN]
 749                         }
 750
 751                         if v.Cursor.HasSelection() &&
 752                                 (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 753                                         charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 754                                 // The current character is selected
 755                                 lineStyle = defStyle.Reverse(true)
 756
 757                                 if style, ok := colorscheme["selection"]; ok {
 758                                         lineStyle = style
 759                                 }
 760                         } else {
 761                                 lineStyle = highlightStyle
 762                         }
 763
 764                         // We need to display the background of the linestyle with the correct color if cursorline is enabled
 765                         // and this is the current view and there is no selection on this line and the cursor is on this line
 766                         if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
 767                                 if style, ok := colorscheme["cursor-line"]; ok {
 768                                         fg, _, _ := style.Decompose()
 769                                         lineStyle = lineStyle.Background(fg)
 770                                 }
 771                         }
 772
 773                         if ch == '\t' {
 774                                 // If the character we are displaying is a tab, we need to do a bunch of special things
 775
 776                                 // First the user may have configured an `indent-char` to be displayed to show that this
 777                                 // is a tab character
 778                                 lineIndentStyle := defStyle
 779                                 if style, ok := colorscheme["indent-char"]; ok && v.Buf.Settings["indentchar"].(string) != " " {
 780                                         lineIndentStyle = style
 781                                 }
 782                                 if v.Cursor.HasSelection() &&
 783                                         (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 784                                                 charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 785
 786                                         lineIndentStyle = defStyle.Reverse(true)
 787
 788                                         if style, ok := colorscheme["selection"]; ok {
 789                                                 lineIndentStyle = style
 790                                         }
 791                                 }
 792                                 if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
 793                                         if style, ok := colorscheme["cursor-line"]; ok {
 794                                                 fg, _, _ := style.Decompose()
 795                                                 lineIndentStyle = lineIndentStyle.Background(fg)
 796                                         }
 797                                 }
 798                                 // Here we get the indent char
 799                                 indentChar := []rune(v.Buf.Settings["indentchar"].(string))
 800                                 if screenX-v.x-v.leftCol >= v.lineNumOffset {
 801                                         v.drawCell(screenX-v.leftCol, screenY, indentChar[0], nil, lineIndentStyle)
 802                                 }
 803                                 // Now the tab has to be displayed as a bunch of spaces
 804                                 visLoc := strWidth
 805                                 remainder := tabSize - (visLoc % tabSize)
 806                                 for i := 0; i < remainder-1; i++ {
 807                                         screenX++
 808                                         if screenX-v.x-v.leftCol >= v.lineNumOffset {
 809                                                 v.drawCell(screenX-v.leftCol, screenY, ' ', nil, lineStyle)
 810                                         }
 811                                 }
 812                         } else if runewidth.RuneWidth(ch) > 1 {
 813                                 if screenX-v.x-v.leftCol >= v.lineNumOffset {
 814                                         v.drawCell(screenX, screenY, ch, nil, lineStyle)
 815                                 }
 816                                 for i := 0; i < runewidth.RuneWidth(ch)-1; i++ {
 817                                         screenX++
 818                                         if screenX-v.x-v.leftCol >= v.lineNumOffset {
 819                                                 v.drawCell(screenX-v.leftCol, screenY, '<', nil, lineStyle)
 820                                         }
 821                                 }
 822                         } else {
 823                                 if screenX-v.x-v.leftCol >= v.lineNumOffset {
 824                                         v.drawCell(screenX-v.leftCol, screenY, ch, nil, lineStyle)
 825                                 }
 826                         }
 827                         charNum = charNum.Move(1, v.Buf)
 828                         screenX++
 829                         colN++
 830                         strWidth += StringWidth(string(ch), tabSize)
 831                 }
 832                 // Here we are at a newline
 833
 834                 if tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN && colN == v.Cursor.X {
 835                         v.DisplayCursor(screenX, screenY)
 836                 }
 837
 838                 // The newline may be selected, in which case we should draw the selection style
 839                 // with a space to represent it
 840                 if v.Cursor.HasSelection() &&
 841                         (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 842                                 charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 843
 844                         selectStyle := defStyle.Reverse(true)
 845
 846                         if style, ok := colorscheme["selection"]; ok {
 847                                 selectStyle = style
 848                         }
 849                         v.drawCell(screenX, screenY, ' ', nil, selectStyle)
 850                         screenX++
 851                 }
 852
 853                 charNum = charNum.Move(1, v.Buf)
 854
 855                 for i := 0; i < v.width; i++ {
 856                         lineStyle := defStyle
 857                         if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
 858                                 if style, ok := colorscheme["cursor-line"]; ok {
 859                                         fg, _, _ := style.Decompose()
 860                                         lineStyle = lineStyle.Background(fg)
 861                                 }
 862                         }
 863                         if screenX-v.x-v.leftCol+i >= v.lineNumOffset {
 864                                 colorcolumn := int(v.Buf.Settings["colorcolumn"].(float64))
 865                                 if colorcolumn != 0 && screenX-v.lineNumOffset+i == colorcolumn-1 {
 866                                         if style, ok := colorscheme["color-column"]; ok {
 867                                                 fg, _, _ := style.Decompose()
 868                                                 lineStyle = lineStyle.Background(fg)
 869                                         }
 870                                 }
 871                                 v.drawCell(screenX-v.leftCol+i, screenY, ' ', nil, lineStyle)
 872                         }
 873                 }
 874         }
 875 }
 876
 877 // DisplayCursor draws the current buffer's cursor to the screen
 878 func (v *View) DisplayCursor(x, y int) {
 879         // screen.ShowCursor(v.x+v.Cursor.GetVisualX()+v.lineNumOffset-v.leftCol, y)
 880         screen.ShowCursor(x, y)
 881 }
 882
 883 // Display renders the view, the cursor, and statusline
 884 func (v *View) Display() {
 885         v.DisplayView()
 886         // Don't draw the cursor if it is out of the viewport or if it has a selection
 887         if (v.Cursor.Y-v.Topline < 0 || v.Cursor.Y-v.Topline > v.height-1) || v.Cursor.HasSelection() {
 888                 screen.HideCursor()
 889         }
 890         _, screenH := screen.Size()
 891         if v.Buf.Settings["statusline"].(bool) {
 892                 v.sline.Display()
 893         } else if (v.y + v.height) != screenH-1 {
 894                 for x := 0; x < v.width; x++ {
 895                         screen.SetContent(v.x+x, v.y+v.height, '-', nil, defStyle.Reverse(true))
 896                 }
 897         }
 898 }