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