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         // Specifies whether or not this view holds a help buffer
  36         Type ViewType
  37
  38         // Actual width and height
  39         width  int
  40         height int
  41
  42         // Where this view is located
  43         x, y int
  44
  45         // How much to offset because of line numbers
  46         lineNumOffset int
  47
  48         // Holds the list of gutter messages
  49         messages map[string][]GutterMessage
  50
  51         // This is the index of this view in the views array
  52         Num int
  53         // What tab is this view stored in
  54         TabNum int
  55
  56         // The buffer
  57         Buf *Buffer
  58         // The statusline
  59         sline Statusline
  60
  61         // Since tcell doesn't differentiate between a mouse release event
  62         // and a mouse move event with no keys pressed, we need to keep
  63         // track of whether or not the mouse was pressed (or not released) last event to determine
  64         // mouse release events
  65         mouseReleased bool
  66
  67         // This stores when the last click was
  68         // This is useful for detecting double and triple clicks
  69         lastClickTime time.Time
  70
  71         // lastCutTime stores when the last ctrl+k was issued.
  72         // It is used for clearing the clipboard to replace it with fresh cut lines.
  73         lastCutTime time.Time
  74
  75         // freshClip returns true if the clipboard has never been pasted.
  76         freshClip bool
  77
  78         // Was the last mouse event actually a double click?
  79         // Useful for detecting triple clicks -- if a double click is detected
  80         // but the last mouse event was actually a double click, it's a triple click
  81         doubleClick bool
  82         // Same here, just to keep track for mouse move events
  83         tripleClick bool
  84
  85         // Syntax highlighting matches
  86         matches SyntaxMatches
  87
  88         splitNode *LeafNode
  89 }
  90
  91 // NewView returns a new fullscreen view
  92 func NewView(buf *Buffer) *View {
  93         screenW, screenH := screen.Size()
  94         return NewViewWidthHeight(buf, screenW, screenH)
  95 }
  96
  97 // NewViewWidthHeight returns a new view with the specified width and height
  98 // Note that w and h are raw column and row values
  99 func NewViewWidthHeight(buf *Buffer, w, h int) *View {
 100         v := new(View)
 101
 102         v.x, v.y = 0, 0
 103
 104         v.width = w
 105         v.height = h
 106
 107         v.ToggleTabbar()
 108
 109         v.OpenBuffer(buf)
 110
 111         v.messages = make(map[string][]GutterMessage)
 112
 113         v.sline = Statusline{
 114                 view: v,
 115         }
 116
 117         if v.Buf.Settings["statusline"].(bool) {
 118                 v.height--
 119         }
 120
 121         for _, pl := range loadedPlugins {
 122                 _, err := Call(pl+".onViewOpen", v)
 123                 if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
 124                         TermMessage(err)
 125                         continue
 126                 }
 127         }
 128
 129         return v
 130 }
 131
 132 // ToggleStatusLine creates an extra row for the statusline if necessary
 133 func (v *View) ToggleStatusLine() {
 134         if v.Buf.Settings["statusline"].(bool) {
 135                 v.height--
 136         } else {
 137                 v.height++
 138         }
 139 }
 140
 141 // ToggleTabbar creates an extra row for the tabbar if necessary
 142 func (v *View) ToggleTabbar() {
 143         if len(tabs) > 1 {
 144                 if v.y == 0 {
 145                         // Include one line for the tab bar at the top
 146                         v.height--
 147                         v.y = 1
 148                 }
 149         } else {
 150                 if v.y == 1 {
 151                         v.y = 0
 152                         v.height++
 153                 }
 154         }
 155 }
 156
 157 func (v *View) paste(clip string) {
 158         leadingWS := GetLeadingWhitespace(v.Buf.Line(v.Cursor.Y))
 159
 160         if v.Cursor.HasSelection() {
 161                 v.Cursor.DeleteSelection()
 162                 v.Cursor.ResetSelection()
 163         }
 164         clip = strings.Replace(clip, "\n", "\n"+leadingWS, -1)
 165         v.Buf.Insert(v.Cursor.Loc, clip)
 166         v.Cursor.Loc = v.Cursor.Loc.Move(Count(clip), v.Buf)
 167         v.freshClip = false
 168         messenger.Message("Pasted clipboard")
 169 }
 170
 171 // ScrollUp scrolls the view up n lines (if possible)
 172 func (v *View) ScrollUp(n int) {
 173         // Try to scroll by n but if it would overflow, scroll by 1
 174         if v.Topline-n >= 0 {
 175                 v.Topline -= n
 176         } else if v.Topline > 0 {
 177                 v.Topline--
 178         }
 179 }
 180
 181 // ScrollDown scrolls the view down n lines (if possible)
 182 func (v *View) ScrollDown(n int) {
 183         // Try to scroll by n but if it would overflow, scroll by 1
 184         if v.Topline+n <= v.Buf.NumLines-v.height {
 185                 v.Topline += n
 186         } else if v.Topline < v.Buf.NumLines-v.height {
 187                 v.Topline++
 188         }
 189 }
 190
 191 // CanClose returns whether or not the view can be closed
 192 // If there are unsaved changes, the user will be asked if the view can be closed
 193 // causing them to lose the unsaved changes
 194 func (v *View) CanClose() bool {
 195         if v.Type == vtDefault && v.Buf.IsModified {
 196                 var char rune
 197                 var canceled bool
 198                 if v.Buf.Settings["autosave"].(bool) {
 199                         char = 'y'
 200                 } else {
 201                         char, canceled = messenger.LetterPrompt("Save changes to "+v.Buf.Name+" before closing? (y,n,esc) ", 'y', 'n')
 202                 }
 203                 if !canceled {
 204                         if char == 'y' {
 205                                 v.Save(true)
 206                                 return true
 207                         } else if char == 'n' {
 208                                 return true
 209                         }
 210                 }
 211         } else {
 212                 return true
 213         }
 214         return false
 215 }
 216
 217 // OpenBuffer opens a new buffer in this view.
 218 // This resets the topline, event handler and cursor.
 219 func (v *View) OpenBuffer(buf *Buffer) {
 220         screen.Clear()
 221         v.CloseBuffer()
 222         v.Buf = buf
 223         v.Cursor = &buf.Cursor
 224         v.Topline = 0
 225         v.leftCol = 0
 226         v.Cursor.ResetSelection()
 227         v.Relocate()
 228         v.Center(false)
 229         v.messages = make(map[string][]GutterMessage)
 230
 231         v.matches = Match(v)
 232
 233         // Set mouseReleased to true because we assume the mouse is not being pressed when
 234         // the editor is opened
 235         v.mouseReleased = true
 236         v.lastClickTime = time.Time{}
 237 }
 238
 239 // Open opens the given file in the view
 240 func (v *View) Open(filename string) {
 241         home, _ := homedir.Dir()
 242         filename = strings.Replace(filename, "~", home, 1)
 243         file, err := ioutil.ReadFile(filename)
 244
 245         var buf *Buffer
 246         if err != nil {
 247                 messenger.Message(err.Error())
 248                 // File does not exist -- create an empty buffer with that name
 249                 buf = NewBuffer([]byte{}, filename)
 250         } else {
 251                 buf = NewBuffer(file, filename)
 252         }
 253         v.OpenBuffer(buf)
 254 }
 255
 256 // CloseBuffer performs any closing functions on the buffer
 257 func (v *View) CloseBuffer() {
 258         if v.Buf != nil {
 259                 v.Buf.Serialize()
 260         }
 261 }
 262
 263 // ReOpen reloads the current buffer
 264 func (v *View) ReOpen() {
 265         if v.CanClose() {
 266                 screen.Clear()
 267                 v.Buf.ReOpen()
 268                 v.Relocate()
 269                 v.matches = Match(v)
 270         }
 271 }
 272
 273 // HSplit opens a horizontal split with the given buffer
 274 func (v *View) HSplit(buf *Buffer) bool {
 275         v.splitNode.HSplit(buf)
 276         tabs[v.TabNum].Resize()
 277         return false
 278 }
 279
 280 // VSplit opens a vertical split with the given buffer
 281 func (v *View) VSplit(buf *Buffer) bool {
 282         v.splitNode.VSplit(buf)
 283         tabs[v.TabNum].Resize()
 284         return false
 285 }
 286
 287 // GetSoftWrapLocation gets the location of a visual click on the screen and converts it to col,line
 288 func (v *View) GetSoftWrapLocation(vx, vy int) (int, int) {
 289         if !v.Buf.Settings["softwrap"].(bool) {
 290                 vx = v.Cursor.GetCharPosInLine(vy, vx)
 291                 return vx, vy
 292         }
 293
 294         screenX, screenY := 0, v.Topline
 295         for lineN := v.Topline; lineN < v.Bottomline; lineN++ {
 296                 line := v.Buf.Line(lineN)
 297
 298                 colN := 0
 299                 for _, ch := range line {
 300                         if screenX >= v.width-v.lineNumOffset {
 301                                 screenX = 0
 302                                 screenY++
 303                         }
 304
 305                         if screenX == vx && screenY == vy {
 306                                 return colN, lineN
 307                         }
 308
 309                         if ch == '\t' {
 310                                 screenX += int(v.Buf.Settings["tabsize"].(float64)) - 1
 311                         }
 312
 313                         screenX++
 314                         colN++
 315                 }
 316                 if screenY == vy {
 317                         return colN, lineN
 318                 }
 319                 screenX = 0
 320                 screenY++
 321         }
 322
 323         return 0, 0
 324 }
 325
 326 // Relocate moves the view window so that the cursor is in view
 327 // This is useful if the user has scrolled far away, and then starts typing
 328 func (v *View) Relocate() bool {
 329         height := v.Bottomline - v.Topline
 330         ret := false
 331         cy := v.Cursor.Y
 332         scrollmargin := int(v.Buf.Settings["scrollmargin"].(float64))
 333         if cy < v.Topline+scrollmargin && cy > scrollmargin-1 {
 334                 v.Topline = cy - scrollmargin
 335                 ret = true
 336         } else if cy < v.Topline {
 337                 v.Topline = cy
 338                 ret = true
 339         }
 340         if cy > v.Topline+height-1-scrollmargin && cy < v.Buf.NumLines-scrollmargin {
 341                 v.Topline = cy - height + 1 + scrollmargin
 342                 ret = true
 343         } else if cy >= v.Buf.NumLines-scrollmargin && cy > height {
 344                 v.Topline = v.Buf.NumLines - height
 345                 ret = true
 346         }
 347
 348         if !v.Buf.Settings["softwrap"].(bool) {
 349                 cx := v.Cursor.GetVisualX()
 350                 if cx < v.leftCol {
 351                         v.leftCol = cx
 352                         ret = true
 353                 }
 354                 if cx+v.lineNumOffset+1 > v.leftCol+v.width {
 355                         v.leftCol = cx - v.width + v.lineNumOffset + 1
 356                         ret = true
 357                 }
 358         }
 359         return ret
 360 }
 361
 362 // MoveToMouseClick moves the cursor to location x, y assuming x, y were given
 363 // by a mouse click
 364 func (v *View) MoveToMouseClick(x, y int) {
 365         if y-v.Topline > v.height-1 {
 366                 v.ScrollDown(1)
 367                 y = v.height + v.Topline - 1
 368         }
 369         if y >= v.Buf.NumLines {
 370                 y = v.Buf.NumLines - 1
 371         }
 372         if y < 0 {
 373                 y = 0
 374         }
 375         if x < 0 {
 376                 x = 0
 377         }
 378
 379         x, y = v.GetSoftWrapLocation(x, y)
 380         // x = v.Cursor.GetCharPosInLine(y, x)
 381         if x > Count(v.Buf.Line(y)) {
 382                 x = Count(v.Buf.Line(y))
 383         }
 384         v.Cursor.X = x
 385         v.Cursor.Y = y
 386         v.Cursor.LastVisualX = v.Cursor.GetVisualX()
 387 }
 388
 389 // HandleEvent handles an event passed by the main loop
 390 func (v *View) HandleEvent(event tcell.Event) {
 391         // This bool determines whether the view is relocated at the end of the function
 392         // By default it's true because most events should cause a relocate
 393         relocate := true
 394
 395         v.Buf.CheckModTime()
 396
 397         switch e := event.(type) {
 398         case *tcell.EventResize:
 399                 // Window resized
 400                 tabs[v.TabNum].Resize()
 401         case *tcell.EventKey:
 402                 // Check first if input is a key binding, if it is we 'eat' the input and don't insert a rune
 403                 isBinding := false
 404                 if e.Key() != tcell.KeyRune || e.Modifiers() != 0 {
 405                         for key, actions := range bindings {
 406                                 if e.Key() == key.keyCode {
 407                                         if e.Key() == tcell.KeyRune {
 408                                                 if e.Rune() != key.r {
 409                                                         continue
 410                                                 }
 411                                         }
 412                                         if e.Modifiers() == key.modifiers {
 413                                                 relocate = false
 414                                                 isBinding = true
 415                                                 for _, action := range actions {
 416                                                         relocate = action(v, true) || relocate
 417                                                         funcName := FuncName(action)
 418                                                         if funcName != "main.(*View).ToggleMacro" && funcName != "main.(*View).PlayMacro" {
 419                                                                 if recordingMacro {
 420                                                                         curMacro = append(curMacro, action)
 421                                                                 }
 422                                                         }
 423                                                 }
 424                                                 break
 425                                         }
 426                                 }
 427                         }
 428                 }
 429                 if !isBinding && e.Key() == tcell.KeyRune {
 430                         // Insert a character
 431                         if v.Cursor.HasSelection() {
 432                                 v.Cursor.DeleteSelection()
 433                                 v.Cursor.ResetSelection()
 434                         }
 435                         v.Buf.Insert(v.Cursor.Loc, string(e.Rune()))
 436                         v.Cursor.Right()
 437
 438                         for _, pl := range loadedPlugins {
 439                                 _, err := Call(pl+".onRune", string(e.Rune()), v)
 440                                 if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
 441                                         TermMessage(err)
 442                                 }
 443                         }
 444
 445                         if recordingMacro {
 446                                 curMacro = append(curMacro, e.Rune())
 447                         }
 448                 }
 449         case *tcell.EventPaste:
 450                 if !PreActionCall("Paste", v) {
 451                         break
 452                 }
 453
 454                 leadingWS := GetLeadingWhitespace(v.Buf.Line(v.Cursor.Y))
 455
 456                 if v.Cursor.HasSelection() {
 457                         v.Cursor.DeleteSelection()
 458                         v.Cursor.ResetSelection()
 459                 }
 460                 clip := e.Text()
 461                 clip = strings.Replace(clip, "\n", "\n"+leadingWS, -1)
 462                 v.Buf.Insert(v.Cursor.Loc, clip)
 463                 v.Cursor.Loc = v.Cursor.Loc.Move(Count(clip), v.Buf)
 464                 v.freshClip = false
 465                 messenger.Message("Pasted clipboard")
 466
 467                 PostActionCall("Paste", v)
 468         case *tcell.EventMouse:
 469                 x, y := e.Position()
 470                 x -= v.lineNumOffset - v.leftCol + v.x
 471                 y += v.Topline - v.y
 472                 // Don't relocate for mouse events
 473                 relocate = false
 474
 475                 button := e.Buttons()
 476
 477                 switch button {
 478                 case tcell.Button1:
 479                         // Left click
 480                         if v.mouseReleased {
 481                                 v.MoveToMouseClick(x, y)
 482                                 if time.Since(v.lastClickTime)/time.Millisecond < doubleClickThreshold {
 483                                         if v.doubleClick {
 484                                                 // Triple click
 485                                                 v.lastClickTime = time.Now()
 486
 487                                                 v.tripleClick = true
 488                                                 v.doubleClick = false
 489
 490                                                 v.Cursor.SelectLine()
 491                                         } else {
 492                                                 // Double click
 493                                                 v.lastClickTime = time.Now()
 494
 495                                                 v.doubleClick = true
 496                                                 v.tripleClick = false
 497
 498                                                 v.Cursor.SelectWord()
 499                                         }
 500                                 } else {
 501                                         v.doubleClick = false
 502                                         v.tripleClick = false
 503                                         v.lastClickTime = time.Now()
 504
 505                                         v.Cursor.OrigSelection[0] = v.Cursor.Loc
 506                                         v.Cursor.CurSelection[0] = v.Cursor.Loc
 507                                         v.Cursor.CurSelection[1] = v.Cursor.Loc
 508                                 }
 509                                 v.mouseReleased = false
 510                         } else if !v.mouseReleased {
 511                                 v.MoveToMouseClick(x, y)
 512                                 if v.tripleClick {
 513                                         v.Cursor.AddLineToSelection()
 514                                 } else if v.doubleClick {
 515                                         v.Cursor.AddWordToSelection()
 516                                 } else {
 517                                         v.Cursor.SetSelectionEnd(v.Cursor.Loc)
 518                                 }
 519                         }
 520                 case tcell.Button2:
 521                         // Middle mouse button was clicked,
 522                         // We should paste primary
 523                         v.PastePrimary(true)
 524                 case tcell.ButtonNone:
 525                         // Mouse event with no click
 526                         if !v.mouseReleased {
 527                                 // Mouse was just released
 528
 529                                 // Relocating here isn't really necessary because the cursor will
 530                                 // be in the right place from the last mouse event
 531                                 // However, if we are running in a terminal that doesn't support mouse motion
 532                                 // events, this still allows the user to make selections, except only after they
 533                                 // release the mouse
 534
 535                                 if !v.doubleClick && !v.tripleClick {
 536                                         v.MoveToMouseClick(x, y)
 537                                         v.Cursor.SetSelectionEnd(v.Cursor.Loc)
 538                                 }
 539                                 v.mouseReleased = true
 540                         }
 541                 case tcell.WheelUp:
 542                         // Scroll up
 543                         scrollspeed := int(v.Buf.Settings["scrollspeed"].(float64))
 544                         v.ScrollUp(scrollspeed)
 545                 case tcell.WheelDown:
 546                         // Scroll down
 547                         scrollspeed := int(v.Buf.Settings["scrollspeed"].(float64))
 548                         v.ScrollDown(scrollspeed)
 549                 }
 550         }
 551
 552         if relocate {
 553                 v.Relocate()
 554         }
 555 }
 556
 557 // GutterMessage creates a message in this view's gutter
 558 func (v *View) GutterMessage(section string, lineN int, msg string, kind int) {
 559         lineN--
 560         gutterMsg := GutterMessage{
 561                 lineNum: lineN,
 562                 msg:     msg,
 563                 kind:    kind,
 564         }
 565         for _, v := range v.messages {
 566                 for _, gmsg := range v {
 567                         if gmsg.lineNum == lineN {
 568                                 return
 569                         }
 570                 }
 571         }
 572         messages := v.messages[section]
 573         v.messages[section] = append(messages, gutterMsg)
 574 }
 575
 576 // ClearGutterMessages clears all gutter messages from a given section
 577 func (v *View) ClearGutterMessages(section string) {
 578         v.messages[section] = []GutterMessage{}
 579 }
 580
 581 // ClearAllGutterMessages clears all the gutter messages
 582 func (v *View) ClearAllGutterMessages() {
 583         for k := range v.messages {
 584                 v.messages[k] = []GutterMessage{}
 585         }
 586 }
 587
 588 // Opens the given help page in a new horizontal split
 589 func (v *View) openHelp(helpPage string) {
 590         if data, err := FindRuntimeFile(RTHelp, helpPage).Data(); err != nil {
 591                 TermMessage("Unable to load help text", helpPage, "\n", err)
 592         } else {
 593                 helpBuffer := NewBuffer(data, helpPage+".md")
 594                 helpBuffer.Name = "Help"
 595
 596                 if v.Type == vtHelp {
 597                         v.OpenBuffer(helpBuffer)
 598                 } else {
 599                         v.HSplit(helpBuffer)
 600                         CurView().Type = vtHelp
 601                 }
 602         }
 603 }
 604
 605 func (v *View) drawCell(x, y int, ch rune, combc []rune, style tcell.Style) {
 606         if x >= v.x && x < v.x+v.width && y >= v.y && y < v.y+v.height {
 607                 screen.SetContent(x, y, ch, combc, style)
 608         }
 609 }
 610
 611 // DisplayView renders the view to the screen
 612 func (v *View) DisplayView() {
 613         if v.Type == vtLog {
 614                 // Log views should always follow the cursor...
 615                 v.Relocate()
 616         }
 617
 618         if v.Buf.Settings["syntax"].(bool) {
 619                 v.matches = Match(v)
 620         }
 621
 622         // The charNum we are currently displaying
 623         // starts at the start of the viewport
 624         charNum := Loc{0, v.Topline}
 625
 626         // Convert the length of buffer to a string, and get the length of the string
 627         // We are going to have to offset by that amount
 628         maxLineLength := len(strconv.Itoa(v.Buf.NumLines))
 629
 630         if v.Buf.Settings["ruler"] == true {
 631                 // + 1 for the little space after the line number
 632                 v.lineNumOffset = maxLineLength + 1
 633         } else {
 634                 v.lineNumOffset = 0
 635         }
 636
 637         // We need to add to the line offset if there are gutter messages
 638         var hasGutterMessages bool
 639         for _, v := range v.messages {
 640                 if len(v) > 0 {
 641                         hasGutterMessages = true
 642                 }
 643         }
 644         if hasGutterMessages {
 645                 v.lineNumOffset += 2
 646         }
 647
 648         if v.x != 0 {
 649                 // One space for the extra split divider
 650                 v.lineNumOffset++
 651         }
 652
 653         // These represent the current screen coordinates
 654         screenX, screenY := v.x, v.y-1
 655
 656         highlightStyle := defStyle
 657         curLineN := 0
 658
 659         // ViewLine is the current line from the top of the viewport
 660         for viewLine := 0; viewLine < v.height; viewLine++ {
 661                 screenY++
 662                 screenX = v.x
 663
 664                 // This is the current line number of the buffer that we are drawing
 665                 curLineN = viewLine + v.Topline
 666
 667                 if screenY-v.y >= v.height {
 668                         break
 669                 }
 670
 671                 if v.x != 0 {
 672                         // Draw the split divider
 673                         v.drawCell(screenX, screenY, '|', nil, defStyle.Reverse(true))
 674                         screenX++
 675                 }
 676
 677                 // If the buffer is smaller than the view height we have to clear all this space
 678                 if curLineN >= v.Buf.NumLines {
 679                         for i := screenX; i < v.x+v.width; i++ {
 680                                 v.drawCell(i, screenY, ' ', nil, defStyle)
 681                         }
 682
 683                         continue
 684                 }
 685                 line := v.Buf.Line(curLineN)
 686
 687                 // If there are gutter messages we need to display the '>>' symbol here
 688                 if hasGutterMessages {
 689                         // msgOnLine stores whether or not there is a gutter message on this line in particular
 690                         msgOnLine := false
 691                         for k := range v.messages {
 692                                 for _, msg := range v.messages[k] {
 693                                         if msg.lineNum == curLineN {
 694                                                 msgOnLine = true
 695                                                 gutterStyle := defStyle
 696                                                 switch msg.kind {
 697                                                 case GutterInfo:
 698                                                         if style, ok := colorscheme["gutter-info"]; ok {
 699                                                                 gutterStyle = style
 700                                                         }
 701                                                 case GutterWarning:
 702                                                         if style, ok := colorscheme["gutter-warning"]; ok {
 703                                                                 gutterStyle = style
 704                                                         }
 705                                                 case GutterError:
 706                                                         if style, ok := colorscheme["gutter-error"]; ok {
 707                                                                 gutterStyle = style
 708                                                         }
 709                                                 }
 710                                                 v.drawCell(screenX, screenY, '>', nil, gutterStyle)
 711                                                 screenX++
 712                                                 v.drawCell(screenX, screenY, '>', nil, gutterStyle)
 713                                                 screenX++
 714                                                 if v.Cursor.Y == curLineN && !messenger.hasPrompt {
 715                                                         messenger.Message(msg.msg)
 716                                                         messenger.gutterMessage = true
 717                                                 }
 718                                         }
 719                                 }
 720                         }
 721                         // If there is no message on this line we just display an empty offset
 722                         if !msgOnLine {
 723                                 v.drawCell(screenX, screenY, ' ', nil, defStyle)
 724                                 screenX++
 725                                 v.drawCell(screenX, screenY, ' ', nil, defStyle)
 726                                 screenX++
 727                                 if v.Cursor.Y == curLineN && messenger.gutterMessage {
 728                                         messenger.Reset()
 729                                         messenger.gutterMessage = false
 730                                 }
 731                         }
 732                 }
 733
 734                 lineNumStyle := defStyle
 735                 if v.Buf.Settings["ruler"] == true {
 736                         // Write the line number
 737                         if style, ok := colorscheme["line-number"]; ok {
 738                                 lineNumStyle = style
 739                         }
 740                         if style, ok := colorscheme["current-line-number"]; ok {
 741                                 if curLineN == v.Cursor.Y && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() {
 742                                         lineNumStyle = style
 743                                 }
 744                         }
 745
 746                         lineNum := strconv.Itoa(curLineN + 1)
 747
 748                         // Write the spaces before the line number if necessary
 749                         for i := 0; i < maxLineLength-len(lineNum); i++ {
 750                                 v.drawCell(screenX, screenY, ' ', nil, lineNumStyle)
 751                                 screenX++
 752                         }
 753                         // Write the actual line number
 754                         for _, ch := range lineNum {
 755                                 v.drawCell(screenX, screenY, ch, nil, lineNumStyle)
 756                                 screenX++
 757                         }
 758
 759                         // Write the extra space
 760                         v.drawCell(screenX, screenY, ' ', nil, lineNumStyle)
 761                         screenX++
 762                 }
 763
 764                 // Now we actually draw the line
 765                 colN := 0
 766                 strWidth := 0
 767                 tabSize := int(v.Buf.Settings["tabsize"].(float64))
 768                 for _, ch := range line {
 769                         if v.Buf.Settings["softwrap"].(bool) {
 770                                 if screenX-v.x >= v.width {
 771                                         screenY++
 772                                         for i := 0; i < v.lineNumOffset; i++ {
 773                                                 screen.SetContent(v.x+i, screenY, ' ', nil, lineNumStyle)
 774                                         }
 775                                         screenX = v.x + v.lineNumOffset
 776                                 }
 777                         }
 778
 779                         if tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN && colN == v.Cursor.X {
 780                                 v.DisplayCursor(screenX-v.leftCol, screenY)
 781                         }
 782
 783                         lineStyle := defStyle
 784
 785                         if v.Buf.Settings["syntax"].(bool) {
 786                                 // Syntax highlighting is enabled
 787                                 highlightStyle = v.matches[viewLine][colN]
 788                         }
 789
 790                         if v.Cursor.HasSelection() &&
 791                                 (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 792                                         charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 793                                 // The current character is selected
 794                                 lineStyle = defStyle.Reverse(true)
 795
 796                                 if style, ok := colorscheme["selection"]; ok {
 797                                         lineStyle = style
 798                                 }
 799                         } else {
 800                                 lineStyle = highlightStyle
 801                         }
 802
 803                         // We need to display the background of the linestyle with the correct color if cursorline is enabled
 804                         // and this is the current view and there is no selection on this line and the cursor is on this line
 805                         if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
 806                                 if style, ok := colorscheme["cursor-line"]; ok {
 807                                         fg, _, _ := style.Decompose()
 808                                         lineStyle = lineStyle.Background(fg)
 809                                 }
 810                         }
 811
 812                         if ch == '\t' {
 813                                 // If the character we are displaying is a tab, we need to do a bunch of special things
 814
 815                                 // First the user may have configured an `indent-char` to be displayed to show that this
 816                                 // is a tab character
 817                                 lineIndentStyle := defStyle
 818                                 if style, ok := colorscheme["indent-char"]; ok && v.Buf.Settings["indentchar"].(string) != " " {
 819                                         lineIndentStyle = style
 820                                 }
 821                                 if v.Cursor.HasSelection() &&
 822                                         (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 823                                                 charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 824
 825                                         lineIndentStyle = defStyle.Reverse(true)
 826
 827                                         if style, ok := colorscheme["selection"]; ok {
 828                                                 lineIndentStyle = style
 829                                         }
 830                                 }
 831                                 if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
 832                                         if style, ok := colorscheme["cursor-line"]; ok {
 833                                                 fg, _, _ := style.Decompose()
 834                                                 lineIndentStyle = lineIndentStyle.Background(fg)
 835                                         }
 836                                 }
 837                                 // Here we get the indent char
 838                                 indentChar := []rune(v.Buf.Settings["indentchar"].(string))
 839                                 if screenX-v.x-v.leftCol >= v.lineNumOffset {
 840                                         v.drawCell(screenX-v.leftCol, screenY, indentChar[0], nil, lineIndentStyle)
 841                                 }
 842                                 // Now the tab has to be displayed as a bunch of spaces
 843                                 visLoc := strWidth
 844                                 remainder := tabSize - (visLoc % tabSize)
 845                                 for i := 0; i < remainder-1; i++ {
 846                                         screenX++
 847                                         if screenX-v.x-v.leftCol >= v.lineNumOffset {
 848                                                 v.drawCell(screenX-v.leftCol, screenY, ' ', nil, lineStyle)
 849                                         }
 850                                 }
 851                         } else if runewidth.RuneWidth(ch) > 1 {
 852                                 if screenX-v.x-v.leftCol >= v.lineNumOffset {
 853                                         v.drawCell(screenX, screenY, ch, nil, lineStyle)
 854                                 }
 855                                 for i := 0; i < runewidth.RuneWidth(ch)-1; i++ {
 856                                         screenX++
 857                                         if screenX-v.x-v.leftCol >= v.lineNumOffset {
 858                                                 v.drawCell(screenX-v.leftCol, screenY, '<', nil, lineStyle)
 859                                         }
 860                                 }
 861                         } else {
 862                                 if screenX-v.x-v.leftCol >= v.lineNumOffset {
 863                                         v.drawCell(screenX-v.leftCol, screenY, ch, nil, lineStyle)
 864                                 }
 865                         }
 866                         charNum = charNum.Move(1, v.Buf)
 867                         screenX++
 868                         colN++
 869                         strWidth += StringWidth(string(ch), tabSize)
 870                 }
 871                 // Here we are at a newline
 872
 873                 if tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN && colN == v.Cursor.X {
 874                         v.DisplayCursor(screenX-v.leftCol, screenY)
 875                 }
 876
 877                 // The newline may be selected, in which case we should draw the selection style
 878                 // with a space to represent it
 879                 if v.Cursor.HasSelection() &&
 880                         (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 881                                 charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 882
 883                         selectStyle := defStyle.Reverse(true)
 884
 885                         if style, ok := colorscheme["selection"]; ok {
 886                                 selectStyle = style
 887                         }
 888                         v.drawCell(screenX, screenY, ' ', nil, selectStyle)
 889                         screenX++
 890                 }
 891
 892                 charNum = charNum.Move(1, v.Buf)
 893
 894                 for i := 0; i < v.width; i++ {
 895                         lineStyle := defStyle
 896                         if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
 897                                 if style, ok := colorscheme["cursor-line"]; ok {
 898                                         fg, _, _ := style.Decompose()
 899                                         lineStyle = lineStyle.Background(fg)
 900                                 }
 901                         }
 902                         if screenX-v.x-v.leftCol+i >= v.lineNumOffset {
 903                                 colorcolumn := int(v.Buf.Settings["colorcolumn"].(float64))
 904                                 if colorcolumn != 0 && screenX-v.lineNumOffset+i == colorcolumn-1 {
 905                                         if style, ok := colorscheme["color-column"]; ok {
 906                                                 fg, _, _ := style.Decompose()
 907                                                 lineStyle = lineStyle.Background(fg)
 908                                         }
 909                                 }
 910                                 v.drawCell(screenX-v.leftCol+i, screenY, ' ', nil, lineStyle)
 911                         }
 912                 }
 913         }
 914         v.Bottomline = curLineN
 915         if !v.Buf.Settings["softwrap"].(bool) {
 916                 v.Bottomline++
 917         }
 918 }
 919
 920 // DisplayCursor draws the current buffer's cursor to the screen
 921 func (v *View) DisplayCursor(x, y int) {
 922         // screen.ShowCursor(v.x+v.Cursor.GetVisualX()+v.lineNumOffset-v.leftCol, y)
 923         screen.ShowCursor(x, y)
 924 }
 925
 926 // Display renders the view, the cursor, and statusline
 927 func (v *View) Display() {
 928         v.DisplayView()
 929         // Don't draw the cursor if it is out of the viewport or if it has a selection
 930         if (v.Cursor.Y-v.Topline < 0 || v.Cursor.Y-v.Topline > v.height-1) || v.Cursor.HasSelection() {
 931                 screen.HideCursor()
 932         }
 933         _, screenH := screen.Size()
 934         if v.Buf.Settings["statusline"].(bool) {
 935                 v.sline.Display()
 936         } else if (v.y + v.height) != screenH-1 {
 937                 for x := 0; x < v.width; x++ {
 938                         screen.SetContent(v.x+x, v.y+v.height, '-', nil, defStyle.Reverse(true))
 939                 }
 940         }
 941 }