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         // The leftmost column, used for horizontal scrolling
  32         leftCol int
  33
  34         // Specifies whether or not this view holds a help buffer
  35         Type ViewType
  36
  37         // Actual width and height
  38         Width  int
  39         Height int
  40
  41         LockWidth  bool
  42         LockHeight bool
  43
  44         // Where this view is located
  45         x, y int
  46
  47         // How much to offset because of line numbers
  48         lineNumOffset int
  49
  50         // Holds the list of gutter messages
  51         messages map[string][]GutterMessage
  52
  53         // This is the index of this view in the views array
  54         Num int
  55         // What tab is this view stored in
  56         TabNum int
  57
  58         // The buffer
  59         Buf *Buffer
  60         // The statusline
  61         sline Statusline
  62
  63         // Since tcell doesn't differentiate between a mouse release event
  64         // and a mouse move event with no keys pressed, we need to keep
  65         // track of whether or not the mouse was pressed (or not released) last event to determine
  66         // mouse release events
  67         mouseReleased bool
  68
  69         // This stores when the last click was
  70         // This is useful for detecting double and triple clicks
  71         lastClickTime time.Time
  72
  73         // lastCutTime stores when the last ctrl+k was issued.
  74         // It is used for clearing the clipboard to replace it with fresh cut lines.
  75         lastCutTime time.Time
  76
  77         // freshClip returns true if the clipboard has never been pasted.
  78         freshClip bool
  79
  80         // Was the last mouse event actually a double click?
  81         // Useful for detecting triple clicks -- if a double click is detected
  82         // but the last mouse event was actually a double click, it's a triple click
  83         doubleClick bool
  84         // Same here, just to keep track for mouse move events
  85         tripleClick bool
  86
  87         // Syntax highlighting matches
  88         matches SyntaxMatches
  89
  90         splitNode *LeafNode
  91 }
  92
  93 // NewView returns a new fullscreen view
  94 func NewView(buf *Buffer) *View {
  95         screenW, screenH := screen.Size()
  96         return NewViewWidthHeight(buf, screenW, screenH)
  97 }
  98
  99 // NewViewWidthHeight returns a new view with the specified width and height
 100 // Note that w and h are raw column and row values
 101 func NewViewWidthHeight(buf *Buffer, w, h int) *View {
 102         v := new(View)
 103
 104         v.x, v.y = 0, 0
 105
 106         v.Width = w
 107         v.Height = h
 108
 109         v.ToggleTabbar()
 110
 111         v.OpenBuffer(buf)
 112
 113         v.messages = make(map[string][]GutterMessage)
 114
 115         v.sline = Statusline{
 116                 view: v,
 117         }
 118
 119         if v.Buf.Settings["statusline"].(bool) {
 120                 v.Height--
 121         }
 122
 123         for _, pl := range loadedPlugins {
 124                 _, err := Call(pl+".onViewOpen", v)
 125                 if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
 126                         TermMessage(err)
 127                         continue
 128                 }
 129         }
 130
 131         return v
 132 }
 133
 134 // ToggleStatusLine creates an extra row for the statusline if necessary
 135 func (v *View) ToggleStatusLine() {
 136         if v.Buf.Settings["statusline"].(bool) {
 137                 v.Height--
 138         } else {
 139                 v.Height++
 140         }
 141 }
 142
 143 // ToggleTabbar creates an extra row for the tabbar if necessary
 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.GetName()+" 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 // Open opens the given file in the view
 242 func (v *View) Open(filename string) {
 243         home, _ := homedir.Dir()
 244         filename = strings.Replace(filename, "~", home, 1)
 245         file, err := ioutil.ReadFile(filename)
 246
 247         var buf *Buffer
 248         if err != nil {
 249                 messenger.Message(err.Error())
 250                 // File does not exist -- create an empty buffer with that name
 251                 buf = NewBuffer([]byte{}, filename)
 252         } else {
 253                 buf = NewBuffer(file, filename)
 254         }
 255         v.OpenBuffer(buf)
 256 }
 257
 258 // CloseBuffer performs any closing functions on the buffer
 259 func (v *View) CloseBuffer() {
 260         if v.Buf != nil {
 261                 v.Buf.Serialize()
 262         }
 263 }
 264
 265 // ReOpen reloads the current buffer
 266 func (v *View) ReOpen() {
 267         if v.CanClose() {
 268                 screen.Clear()
 269                 v.Buf.ReOpen()
 270                 v.Relocate()
 271                 v.matches = Match(v)
 272         }
 273 }
 274
 275 // HSplit opens a horizontal split with the given buffer
 276 func (v *View) HSplit(buf *Buffer) {
 277         i := 0
 278         if v.Buf.Settings["splitBottom"].(bool) {
 279                 i = 1
 280         }
 281         v.splitNode.HSplit(buf, v.Num+i)
 282 }
 283
 284 // VSplit opens a vertical split with the given buffer
 285 func (v *View) VSplit(buf *Buffer) {
 286         i := 0
 287         if v.Buf.Settings["splitRight"].(bool) {
 288                 i = 1
 289         }
 290         v.splitNode.VSplit(buf, v.Num+i)
 291 }
 292
 293 // HSplitIndex opens a horizontal split with the given buffer at the given index
 294 func (v *View) HSplitIndex(buf *Buffer, splitIndex int) {
 295         v.splitNode.HSplit(buf, splitIndex)
 296 }
 297
 298 // VSplitIndex opens a vertical split with the given buffer at the given index
 299 func (v *View) VSplitIndex(buf *Buffer, splitIndex int) {
 300         v.splitNode.VSplit(buf, splitIndex)
 301 }
 302
 303 // GetSoftWrapLocation gets the location of a visual click on the screen and converts it to col,line
 304 func (v *View) GetSoftWrapLocation(vx, vy int) (int, int) {
 305         if !v.Buf.Settings["softwrap"].(bool) {
 306                 vx = v.Cursor.GetCharPosInLine(vy, vx)
 307                 return vx, vy
 308         }
 309
 310         screenX, screenY := 0, v.Topline
 311         for lineN := v.Topline; lineN < v.Bottomline(); lineN++ {
 312                 line := v.Buf.Line(lineN)
 313
 314                 colN := 0
 315                 for _, ch := range line {
 316                         if screenX >= v.Width-v.lineNumOffset {
 317                                 screenX = 0
 318                                 screenY++
 319                         }
 320
 321                         if screenX == vx && screenY == vy {
 322                                 return colN, lineN
 323                         }
 324
 325                         if ch == '\t' {
 326                                 screenX += int(v.Buf.Settings["tabsize"].(float64)) - 1
 327                         }
 328
 329                         screenX++
 330                         colN++
 331                 }
 332                 if screenY == vy {
 333                         return colN, lineN
 334                 }
 335                 screenX = 0
 336                 screenY++
 337         }
 338
 339         return 0, 0
 340 }
 341
 342 func (v *View) Bottomline() int {
 343         if !v.Buf.Settings["softwrap"].(bool) {
 344                 return v.Topline + v.Height
 345         }
 346
 347         screenX, screenY := 0, 0
 348         numLines := 0
 349         for lineN := v.Topline; lineN < v.Topline+v.Height; lineN++ {
 350                 line := v.Buf.Line(lineN)
 351
 352                 colN := 0
 353                 for _, ch := range line {
 354                         if screenX >= v.Width-v.lineNumOffset {
 355                                 screenX = 0
 356                                 screenY++
 357                         }
 358
 359                         if ch == '\t' {
 360                                 screenX += int(v.Buf.Settings["tabsize"].(float64)) - 1
 361                         }
 362
 363                         screenX++
 364                         colN++
 365                 }
 366                 screenX = 0
 367                 screenY++
 368                 numLines++
 369
 370                 if screenY >= v.Height {
 371                         break
 372                 }
 373         }
 374         return numLines + v.Topline
 375 }
 376
 377 // Relocate moves the view window so that the cursor is in view
 378 // This is useful if the user has scrolled far away, and then starts typing
 379 func (v *View) Relocate() bool {
 380         height := v.Bottomline() - v.Topline
 381         ret := false
 382         cy := v.Cursor.Y
 383         scrollmargin := int(v.Buf.Settings["scrollmargin"].(float64))
 384         if cy < v.Topline+scrollmargin && cy > scrollmargin-1 {
 385                 v.Topline = cy - scrollmargin
 386                 ret = true
 387         } else if cy < v.Topline {
 388                 v.Topline = cy
 389                 ret = true
 390         }
 391         if cy > v.Topline+height-1-scrollmargin && cy < v.Buf.NumLines-scrollmargin {
 392                 v.Topline = cy - height + 1 + scrollmargin
 393                 ret = true
 394         } else if cy >= v.Buf.NumLines-scrollmargin && cy > height {
 395                 v.Topline = v.Buf.NumLines - height
 396                 ret = true
 397         }
 398
 399         if !v.Buf.Settings["softwrap"].(bool) {
 400                 cx := v.Cursor.GetVisualX()
 401                 if cx < v.leftCol {
 402                         v.leftCol = cx
 403                         ret = true
 404                 }
 405                 if cx+v.lineNumOffset+1 > v.leftCol+v.Width {
 406                         v.leftCol = cx - v.Width + v.lineNumOffset + 1
 407                         ret = true
 408                 }
 409         }
 410         return ret
 411 }
 412
 413 // MoveToMouseClick moves the cursor to location x, y assuming x, y were given
 414 // by a mouse click
 415 func (v *View) MoveToMouseClick(x, y int) {
 416         if y-v.Topline > v.Height-1 {
 417                 v.ScrollDown(1)
 418                 y = v.Height + v.Topline - 1
 419         }
 420         if y >= v.Buf.NumLines {
 421                 y = v.Buf.NumLines - 1
 422         }
 423         if y < 0 {
 424                 y = 0
 425         }
 426         if x < 0 {
 427                 x = 0
 428         }
 429
 430         x, y = v.GetSoftWrapLocation(x, y)
 431         // x = v.Cursor.GetCharPosInLine(y, x)
 432         if x > Count(v.Buf.Line(y)) {
 433                 x = Count(v.Buf.Line(y))
 434         }
 435         v.Cursor.X = x
 436         v.Cursor.Y = y
 437         v.Cursor.LastVisualX = v.Cursor.GetVisualX()
 438 }
 439
 440 // HandleEvent handles an event passed by the main loop
 441 func (v *View) HandleEvent(event tcell.Event) {
 442         // This bool determines whether the view is relocated at the end of the function
 443         // By default it's true because most events should cause a relocate
 444         relocate := true
 445
 446         v.Buf.CheckModTime()
 447
 448         switch e := event.(type) {
 449         case *tcell.EventResize:
 450                 // Window resized
 451                 tabs[v.TabNum].Resize()
 452         case *tcell.EventKey:
 453                 // Check first if input is a key binding, if it is we 'eat' the input and don't insert a rune
 454                 isBinding := false
 455                 if e.Key() != tcell.KeyRune || e.Modifiers() != 0 {
 456                         for key, actions := range bindings {
 457                                 if e.Key() == key.keyCode {
 458                                         if e.Key() == tcell.KeyRune {
 459                                                 if e.Rune() != key.r {
 460                                                         continue
 461                                                 }
 462                                         }
 463                                         if e.Modifiers() == key.modifiers {
 464                                                 relocate = false
 465                                                 isBinding = true
 466                                                 for _, action := range actions {
 467                                                         relocate = action(v, true) || relocate
 468                                                         funcName := FuncName(action)
 469                                                         if funcName != "main.(*View).ToggleMacro" && funcName != "main.(*View).PlayMacro" {
 470                                                                 if recordingMacro {
 471                                                                         curMacro = append(curMacro, action)
 472                                                                 }
 473                                                         }
 474                                                 }
 475                                                 break
 476                                         }
 477                                 }
 478                         }
 479                 }
 480                 if !isBinding && e.Key() == tcell.KeyRune {
 481                         // Insert a character
 482                         if v.Cursor.HasSelection() {
 483                                 v.Cursor.DeleteSelection()
 484                                 v.Cursor.ResetSelection()
 485                         }
 486                         v.Buf.Insert(v.Cursor.Loc, string(e.Rune()))
 487                         v.Cursor.Right()
 488
 489                         for _, pl := range loadedPlugins {
 490                                 _, err := Call(pl+".onRune", string(e.Rune()), v)
 491                                 if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
 492                                         TermMessage(err)
 493                                 }
 494                         }
 495
 496                         if recordingMacro {
 497                                 curMacro = append(curMacro, e.Rune())
 498                         }
 499                 }
 500         case *tcell.EventPaste:
 501                 if !PreActionCall("Paste", v) {
 502                         break
 503                 }
 504
 505                 v.paste(e.Text())
 506
 507                 PostActionCall("Paste", v)
 508         case *tcell.EventMouse:
 509                 x, y := e.Position()
 510                 x -= v.lineNumOffset - v.leftCol + v.x
 511                 y += v.Topline - v.y
 512                 // Don't relocate for mouse events
 513                 relocate = false
 514
 515                 button := e.Buttons()
 516
 517                 switch button {
 518                 case tcell.Button1:
 519                         // Left click
 520                         if v.mouseReleased {
 521                                 v.MoveToMouseClick(x, y)
 522                                 if time.Since(v.lastClickTime)/time.Millisecond < doubleClickThreshold {
 523                                         if v.doubleClick {
 524                                                 // Triple click
 525                                                 v.lastClickTime = time.Now()
 526
 527                                                 v.tripleClick = true
 528                                                 v.doubleClick = false
 529
 530                                                 v.Cursor.SelectLine()
 531                                         } else {
 532                                                 // Double click
 533                                                 v.lastClickTime = time.Now()
 534
 535                                                 v.doubleClick = true
 536                                                 v.tripleClick = false
 537
 538                                                 v.Cursor.SelectWord()
 539                                         }
 540                                 } else {
 541                                         v.doubleClick = false
 542                                         v.tripleClick = false
 543                                         v.lastClickTime = time.Now()
 544
 545                                         v.Cursor.OrigSelection[0] = v.Cursor.Loc
 546                                         v.Cursor.CurSelection[0] = v.Cursor.Loc
 547                                         v.Cursor.CurSelection[1] = v.Cursor.Loc
 548                                 }
 549                                 v.mouseReleased = false
 550                         } else if !v.mouseReleased {
 551                                 v.MoveToMouseClick(x, y)
 552                                 if v.tripleClick {
 553                                         v.Cursor.AddLineToSelection()
 554                                 } else if v.doubleClick {
 555                                         v.Cursor.AddWordToSelection()
 556                                 } else {
 557                                         v.Cursor.SetSelectionEnd(v.Cursor.Loc)
 558                                 }
 559                         }
 560                 case tcell.Button2:
 561                         // Middle mouse button was clicked,
 562                         // We should paste primary
 563                         v.PastePrimary(true)
 564                 case tcell.ButtonNone:
 565                         // Mouse event with no click
 566                         if !v.mouseReleased {
 567                                 // Mouse was just released
 568
 569                                 // Relocating here isn't really necessary because the cursor will
 570                                 // be in the right place from the last mouse event
 571                                 // However, if we are running in a terminal that doesn't support mouse motion
 572                                 // events, this still allows the user to make selections, except only after they
 573                                 // release the mouse
 574
 575                                 if !v.doubleClick && !v.tripleClick {
 576                                         v.MoveToMouseClick(x, y)
 577                                         v.Cursor.SetSelectionEnd(v.Cursor.Loc)
 578                                 }
 579                                 v.mouseReleased = true
 580                         }
 581                 case tcell.WheelUp:
 582                         // Scroll up
 583                         scrollspeed := int(v.Buf.Settings["scrollspeed"].(float64))
 584                         v.ScrollUp(scrollspeed)
 585                 case tcell.WheelDown:
 586                         // Scroll down
 587                         scrollspeed := int(v.Buf.Settings["scrollspeed"].(float64))
 588                         v.ScrollDown(scrollspeed)
 589                 }
 590         }
 591
 592         if relocate {
 593                 v.Relocate()
 594         }
 595 }
 596
 597 // GutterMessage creates a message in this view's gutter
 598 func (v *View) GutterMessage(section string, lineN int, msg string, kind int) {
 599         lineN--
 600         gutterMsg := GutterMessage{
 601                 lineNum: lineN,
 602                 msg:     msg,
 603                 kind:    kind,
 604         }
 605         for _, v := range v.messages {
 606                 for _, gmsg := range v {
 607                         if gmsg.lineNum == lineN {
 608                                 return
 609                         }
 610                 }
 611         }
 612         messages := v.messages[section]
 613         v.messages[section] = append(messages, gutterMsg)
 614 }
 615
 616 // ClearGutterMessages clears all gutter messages from a given section
 617 func (v *View) ClearGutterMessages(section string) {
 618         v.messages[section] = []GutterMessage{}
 619 }
 620
 621 // ClearAllGutterMessages clears all the gutter messages
 622 func (v *View) ClearAllGutterMessages() {
 623         for k := range v.messages {
 624                 v.messages[k] = []GutterMessage{}
 625         }
 626 }
 627
 628 // Opens the given help page in a new horizontal split
 629 func (v *View) openHelp(helpPage string) {
 630         if data, err := FindRuntimeFile(RTHelp, helpPage).Data(); err != nil {
 631                 TermMessage("Unable to load help text", helpPage, "\n", err)
 632         } else {
 633                 helpBuffer := NewBuffer(data, helpPage+".md")
 634                 helpBuffer.name = "Help"
 635
 636                 if v.Type == vtHelp {
 637                         v.OpenBuffer(helpBuffer)
 638                 } else {
 639                         v.HSplit(helpBuffer)
 640                         CurView().Type = vtHelp
 641                 }
 642         }
 643 }
 644
 645 func (v *View) drawCell(x, y int, ch rune, combc []rune, style tcell.Style) {
 646         if x >= v.x && x < v.x+v.Width && y >= v.y && y < v.y+v.Height {
 647                 screen.SetContent(x, y, ch, combc, style)
 648         }
 649 }
 650
 651 // DisplayView renders the view to the screen
 652 func (v *View) DisplayView() {
 653         if v.Type == vtLog {
 654                 // Log views should always follow the cursor...
 655                 v.Relocate()
 656         }
 657
 658         if v.Buf.Settings["syntax"].(bool) {
 659                 v.matches = Match(v)
 660         }
 661
 662         // The charNum we are currently displaying
 663         // starts at the start of the viewport
 664         charNum := Loc{0, v.Topline}
 665
 666         // Convert the length of buffer to a string, and get the length of the string
 667         // We are going to have to offset by that amount
 668         maxLineLength := len(strconv.Itoa(v.Buf.NumLines))
 669
 670         if v.Buf.Settings["ruler"] == true {
 671                 // + 1 for the little space after the line number
 672                 v.lineNumOffset = maxLineLength + 1
 673         } else {
 674                 v.lineNumOffset = 0
 675         }
 676
 677         // We need to add to the line offset if there are gutter messages
 678         var hasGutterMessages bool
 679         for _, v := range v.messages {
 680                 if len(v) > 0 {
 681                         hasGutterMessages = true
 682                 }
 683         }
 684         if hasGutterMessages {
 685                 v.lineNumOffset += 2
 686         }
 687
 688         if v.x != 0 {
 689                 // One space for the extra split divider
 690                 v.lineNumOffset++
 691         }
 692
 693         // These represent the current screen coordinates
 694         screenX, screenY := v.x, v.y-1
 695
 696         highlightStyle := defStyle
 697         curLineN := 0
 698
 699         // ViewLine is the current line from the top of the viewport
 700         for viewLine := 0; viewLine < v.Height; viewLine++ {
 701                 screenY++
 702                 screenX = v.x
 703
 704                 // This is the current line number of the buffer that we are drawing
 705                 curLineN = viewLine + v.Topline
 706
 707                 if screenY-v.y >= v.Height {
 708                         break
 709                 }
 710
 711                 if v.x != 0 {
 712                         // Draw the split divider
 713                         v.drawCell(screenX, screenY, '|', nil, defStyle.Reverse(true))
 714                         screenX++
 715                 }
 716
 717                 // If the buffer is smaller than the view height we have to clear all this space
 718                 if curLineN >= v.Buf.NumLines {
 719                         for i := screenX; i < v.x+v.Width; i++ {
 720                                 v.drawCell(i, screenY, ' ', nil, defStyle)
 721                         }
 722
 723                         continue
 724                 }
 725                 line := v.Buf.Line(curLineN)
 726
 727                 // If there are gutter messages we need to display the '>>' symbol here
 728                 if hasGutterMessages {
 729                         // msgOnLine stores whether or not there is a gutter message on this line in particular
 730                         msgOnLine := false
 731                         for k := range v.messages {
 732                                 for _, msg := range v.messages[k] {
 733                                         if msg.lineNum == curLineN {
 734                                                 msgOnLine = true
 735                                                 gutterStyle := defStyle
 736                                                 switch msg.kind {
 737                                                 case GutterInfo:
 738                                                         if style, ok := colorscheme["gutter-info"]; ok {
 739                                                                 gutterStyle = style
 740                                                         }
 741                                                 case GutterWarning:
 742                                                         if style, ok := colorscheme["gutter-warning"]; ok {
 743                                                                 gutterStyle = style
 744                                                         }
 745                                                 case GutterError:
 746                                                         if style, ok := colorscheme["gutter-error"]; ok {
 747                                                                 gutterStyle = style
 748                                                         }
 749                                                 }
 750                                                 v.drawCell(screenX, screenY, '>', nil, gutterStyle)
 751                                                 screenX++
 752                                                 v.drawCell(screenX, screenY, '>', nil, gutterStyle)
 753                                                 screenX++
 754                                                 if v.Cursor.Y == curLineN && !messenger.hasPrompt {
 755                                                         messenger.Message(msg.msg)
 756                                                         messenger.gutterMessage = true
 757                                                 }
 758                                         }
 759                                 }
 760                         }
 761                         // If there is no message on this line we just display an empty offset
 762                         if !msgOnLine {
 763                                 v.drawCell(screenX, screenY, ' ', nil, defStyle)
 764                                 screenX++
 765                                 v.drawCell(screenX, screenY, ' ', nil, defStyle)
 766                                 screenX++
 767                                 if v.Cursor.Y == curLineN && messenger.gutterMessage {
 768                                         messenger.Reset()
 769                                         messenger.gutterMessage = false
 770                                 }
 771                         }
 772                 }
 773
 774                 lineNumStyle := defStyle
 775                 if v.Buf.Settings["ruler"] == true {
 776                         // Write the line number
 777                         if style, ok := colorscheme["line-number"]; ok {
 778                                 lineNumStyle = style
 779                         }
 780                         if style, ok := colorscheme["current-line-number"]; ok {
 781                                 if curLineN == v.Cursor.Y && tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() {
 782                                         lineNumStyle = style
 783                                 }
 784                         }
 785
 786                         lineNum := strconv.Itoa(curLineN + 1)
 787
 788                         // Write the spaces before the line number if necessary
 789                         for i := 0; i < maxLineLength-len(lineNum); i++ {
 790                                 v.drawCell(screenX, screenY, ' ', nil, lineNumStyle)
 791                                 screenX++
 792                         }
 793                         // Write the actual line number
 794                         for _, ch := range lineNum {
 795                                 v.drawCell(screenX, screenY, ch, nil, lineNumStyle)
 796                                 screenX++
 797                         }
 798
 799                         // Write the extra space
 800                         v.drawCell(screenX, screenY, ' ', nil, lineNumStyle)
 801                         screenX++
 802                 }
 803
 804                 // Now we actually draw the line
 805                 colN := 0
 806                 strWidth := 0
 807                 tabSize := int(v.Buf.Settings["tabsize"].(float64))
 808                 for _, ch := range line {
 809                         if v.Buf.Settings["softwrap"].(bool) {
 810                                 if screenX-v.x >= v.Width {
 811                                         screenY++
 812                                         for i := 0; i < v.lineNumOffset; i++ {
 813                                                 screen.SetContent(v.x+i, screenY, ' ', nil, lineNumStyle)
 814                                         }
 815                                         screenX = v.x + v.lineNumOffset
 816                                 }
 817                         }
 818
 819                         if tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN && colN == v.Cursor.X {
 820                                 v.DisplayCursor(screenX-v.leftCol, screenY)
 821                         }
 822
 823                         lineStyle := defStyle
 824
 825                         if v.Buf.Settings["syntax"].(bool) {
 826                                 // Syntax highlighting is enabled
 827                                 highlightStyle = v.matches[viewLine][colN]
 828                         }
 829
 830                         if v.Cursor.HasSelection() &&
 831                                 (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 832                                         charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 833                                 // The current character is selected
 834                                 lineStyle = defStyle.Reverse(true)
 835
 836                                 if style, ok := colorscheme["selection"]; ok {
 837                                         lineStyle = style
 838                                 }
 839                         } else {
 840                                 lineStyle = highlightStyle
 841                         }
 842
 843                         // We need to display the background of the linestyle with the correct color if cursorline is enabled
 844                         // and this is the current view and there is no selection on this line and the cursor is on this line
 845                         if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
 846                                 if style, ok := colorscheme["cursor-line"]; ok {
 847                                         fg, _, _ := style.Decompose()
 848                                         lineStyle = lineStyle.Background(fg)
 849                                 }
 850                         }
 851
 852                         if ch == '\t' {
 853                                 // If the character we are displaying is a tab, we need to do a bunch of special things
 854
 855                                 // First the user may have configured an `indent-char` to be displayed to show that this
 856                                 // is a tab character
 857                                 lineIndentStyle := defStyle
 858                                 if style, ok := colorscheme["indent-char"]; ok && v.Buf.Settings["indentchar"].(string) != " " {
 859                                         lineIndentStyle = style
 860                                 }
 861                                 if v.Cursor.HasSelection() &&
 862                                         (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 863                                                 charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 864
 865                                         lineIndentStyle = defStyle.Reverse(true)
 866
 867                                         if style, ok := colorscheme["selection"]; ok {
 868                                                 lineIndentStyle = style
 869                                         }
 870                                 }
 871                                 if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
 872                                         if style, ok := colorscheme["cursor-line"]; ok {
 873                                                 fg, _, _ := style.Decompose()
 874                                                 lineIndentStyle = lineIndentStyle.Background(fg)
 875                                         }
 876                                 }
 877                                 // Here we get the indent char
 878                                 indentChar := []rune(v.Buf.Settings["indentchar"].(string))
 879                                 if screenX-v.x-v.leftCol >= v.lineNumOffset {
 880                                         v.drawCell(screenX-v.leftCol, screenY, indentChar[0], nil, lineIndentStyle)
 881                                 }
 882                                 // Now the tab has to be displayed as a bunch of spaces
 883                                 visLoc := strWidth
 884                                 remainder := tabSize - (visLoc % tabSize)
 885                                 for i := 0; i < remainder-1; i++ {
 886                                         screenX++
 887                                         if screenX-v.x-v.leftCol >= v.lineNumOffset {
 888                                                 v.drawCell(screenX-v.leftCol, screenY, ' ', nil, lineStyle)
 889                                         }
 890                                 }
 891                         } else if runewidth.RuneWidth(ch) > 1 {
 892                                 if screenX-v.x-v.leftCol >= v.lineNumOffset {
 893                                         v.drawCell(screenX, screenY, ch, nil, lineStyle)
 894                                 }
 895                                 for i := 0; i < runewidth.RuneWidth(ch)-1; i++ {
 896                                         screenX++
 897                                         if screenX-v.x-v.leftCol >= v.lineNumOffset {
 898                                                 v.drawCell(screenX-v.leftCol, screenY, '<', nil, lineStyle)
 899                                         }
 900                                 }
 901                         } else {
 902                                 if screenX-v.x-v.leftCol >= v.lineNumOffset {
 903                                         v.drawCell(screenX-v.leftCol, screenY, ch, nil, lineStyle)
 904                                 }
 905                         }
 906                         charNum = charNum.Move(1, v.Buf)
 907                         screenX++
 908                         colN++
 909                         strWidth += StringWidth(string(ch), tabSize)
 910                 }
 911                 // Here we are at a newline
 912
 913                 if tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN && colN == v.Cursor.X {
 914                         v.DisplayCursor(screenX-v.leftCol, screenY)
 915                 }
 916
 917                 // The newline may be selected, in which case we should draw the selection style
 918                 // with a space to represent it
 919                 if v.Cursor.HasSelection() &&
 920                         (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 921                                 charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 922
 923                         selectStyle := defStyle.Reverse(true)
 924
 925                         if style, ok := colorscheme["selection"]; ok {
 926                                 selectStyle = style
 927                         }
 928                         v.drawCell(screenX, screenY, ' ', nil, selectStyle)
 929                         screenX++
 930                 }
 931
 932                 charNum = charNum.Move(1, v.Buf)
 933
 934                 for i := 0; i < v.Width; i++ {
 935                         lineStyle := defStyle
 936                         if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
 937                                 if style, ok := colorscheme["cursor-line"]; ok {
 938                                         fg, _, _ := style.Decompose()
 939                                         lineStyle = lineStyle.Background(fg)
 940                                 }
 941                         }
 942                         if screenX-v.x-v.leftCol+i >= v.lineNumOffset {
 943                                 colorcolumn := int(v.Buf.Settings["colorcolumn"].(float64))
 944                                 if colorcolumn != 0 && screenX-v.lineNumOffset+i == colorcolumn-1 {
 945                                         if style, ok := colorscheme["color-column"]; ok {
 946                                                 fg, _, _ := style.Decompose()
 947                                                 lineStyle = lineStyle.Background(fg)
 948                                         }
 949                                 }
 950                                 v.drawCell(screenX-v.leftCol+i, screenY, ' ', nil, lineStyle)
 951                         }
 952                 }
 953         }
 954 }
 955
 956 // DisplayCursor draws the current buffer's cursor to the screen
 957 func (v *View) DisplayCursor(x, y int) {
 958         // screen.ShowCursor(v.x+v.Cursor.GetVisualX()+v.lineNumOffset-v.leftCol, y)
 959         screen.ShowCursor(x, y)
 960 }
 961
 962 // Display renders the view, the cursor, and statusline
 963 func (v *View) Display() {
 964         v.DisplayView()
 965         // Don't draw the cursor if it is out of the viewport or if it has a selection
 966         if (v.Cursor.Y-v.Topline < 0 || v.Cursor.Y-v.Topline > v.Height-1) || v.Cursor.HasSelection() {
 967                 screen.HideCursor()
 968         }
 969         _, screenH := screen.Size()
 970         if v.Buf.Settings["statusline"].(bool) {
 971                 v.sline.Display()
 972         } else if (v.y + v.Height) != screenH-1 {
 973                 for x := 0; x < v.Width; x++ {
 974                         screen.SetContent(v.x+x, v.y+v.Height, '-', nil, defStyle.Reverse(true))
 975                 }
 976         }
 977 }