cmd/micro/view.go

   1 package main
   2
   3 import (
   4         "reflect"
   5         "runtime"
   6         "strconv"
   7         "strings"
   8         "time"
   9
  10         "github.com/mattn/go-runewidth"
  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         // Actual with and height
  31         width  int
  32         height int
  33
  34         // Where this view is located
  35         x, y int
  36
  37         // How much to offset because of line numbers
  38         lineNumOffset int
  39
  40         // Holds the list of gutter messages
  41         messages map[string][]GutterMessage
  42
  43         // Is the help text opened in this view
  44         helpOpen bool
  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         // Is this view modifiable?
  52         Modifiable bool
  53
  54         // The buffer
  55         Buf *Buffer
  56         // This is the buffer that was last opened
  57         // This is used to open help, and then go back to the previously opened buffer
  58         lastBuffer *Buffer
  59         // The statusline
  60         sline Statusline
  61
  62         // Since tcell doesn't differentiate between a mouse release event
  63         // and a mouse move event with no keys pressed, we need to keep
  64         // track of whether or not the mouse was pressed (or not released) last event to determine
  65         // mouse release events
  66         mouseReleased bool
  67
  68         // This stores when the last click was
  69         // This is useful for detecting double and triple clicks
  70         lastClickTime time.Time
  71
  72         // lastCutTime stores when the last ctrl+k was issued.
  73         // It is used for clearing the clipboard to replace it with fresh cut lines.
  74         lastCutTime time.Time
  75
  76         // freshClip returns true if the clipboard has never been pasted.
  77         freshClip bool
  78
  79         // Was the last mouse event actually a double click?
  80         // Useful for detecting triple clicks -- if a double click is detected
  81         // but the last mouse event was actually a double click, it's a triple click
  82         doubleClick bool
  83         // Same here, just to keep track for mouse move events
  84         tripleClick bool
  85
  86         // Syntax highlighting matches
  87         matches SyntaxMatches
  88         // The matches from the last frame
  89         lastMatches SyntaxMatches
  90 }
  91
  92 // NewView returns a new fullscreen view
  93 func NewView(buf *Buffer) *View {
  94         return NewViewWidthHeight(buf, 100, 100)
  95 }
  96
  97 // NewViewWidthHeight returns a new view with the specified width and height percentages
  98 // Note that w and h are percentages not actual 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.widthPercent = w
 105         v.heightPercent = h
 106         v.Resize(screen.Size())
 107
 108         v.OpenBuffer(buf)
 109
 110         v.messages = make(map[string][]GutterMessage)
 111
 112         v.sline = Statusline{
 113                 view: v,
 114         }
 115
 116         return v
 117 }
 118
 119 // Resize recalculates the actual width and height of the view from the width and height
 120 // percentages
 121 // This is usually called when the window is resized, or when a split has been added and
 122 // the percentages have changed
 123 func (v *View) Resize(w, h int) {
 124         // Always include 1 line for the command line at the bottom
 125         h--
 126         // if len(tabs) > 1 {
 127         //      // Include one line for the tab bar at the top
 128         //      h--
 129         //      v.y = 1
 130         // } else {
 131         //      v.y = 0
 132         // }
 133         v.width = int(float32(w) * float32(v.widthPercent) / 100)
 134         // We subtract 1 for the statusline
 135         v.height = int(float32(h) * float32(v.heightPercent) / 100)
 136         if settings["statusline"].(bool) {
 137                 // Make room for the status line if it is enabled
 138                 v.height--
 139         }
 140 }
 141
 142 // ScrollUp scrolls the view up n lines (if possible)
 143 func (v *View) ScrollUp(n int) {
 144         // Try to scroll by n but if it would overflow, scroll by 1
 145         if v.Topline-n >= 0 {
 146                 v.Topline -= n
 147         } else if v.Topline > 0 {
 148                 v.Topline--
 149         }
 150 }
 151
 152 // ScrollDown scrolls the view down n lines (if possible)
 153 func (v *View) ScrollDown(n int) {
 154         // Try to scroll by n but if it would overflow, scroll by 1
 155         if v.Topline+n <= v.Buf.NumLines-v.height {
 156                 v.Topline += n
 157         } else if v.Topline < v.Buf.NumLines-v.height {
 158                 v.Topline++
 159         }
 160 }
 161
 162 // CanClose returns whether or not the view can be closed
 163 // If there are unsaved changes, the user will be asked if the view can be closed
 164 // causing them to lose the unsaved changes
 165 // The message is what to print after saying "You have unsaved changes. "
 166 func (v *View) CanClose(msg string) bool {
 167         if v.Buf.IsModified {
 168                 quit, canceled := messenger.Prompt("You have unsaved changes. "+msg, "Unsaved", NoCompletion)
 169                 if !canceled {
 170                         if strings.ToLower(quit) == "yes" || strings.ToLower(quit) == "y" {
 171                                 return true
 172                         } else if strings.ToLower(quit) == "save" || strings.ToLower(quit) == "s" {
 173                                 v.Save()
 174                                 return true
 175                         }
 176                 }
 177         } else {
 178                 return true
 179         }
 180         return false
 181 }
 182
 183 // OpenBuffer opens a new buffer in this view.
 184 // This resets the topline, event handler and cursor.
 185 func (v *View) OpenBuffer(buf *Buffer) {
 186         screen.Clear()
 187         v.CloseBuffer()
 188         v.Buf = buf
 189         v.Cursor = &buf.Cursor
 190         v.Topline = 0
 191         v.leftCol = 0
 192         v.Cursor.ResetSelection()
 193         v.Relocate()
 194         v.messages = make(map[string][]GutterMessage)
 195
 196         v.matches = Match(v)
 197
 198         // Set mouseReleased to true because we assume the mouse is not being pressed when
 199         // the editor is opened
 200         v.mouseReleased = true
 201         v.lastClickTime = time.Time{}
 202 }
 203
 204 // CloseBuffer performs any closing functions on the buffer
 205 func (v *View) CloseBuffer() {
 206         if v.Buf != nil {
 207                 v.Buf.Serialize()
 208         }
 209 }
 210
 211 // ReOpen reloads the current buffer
 212 func (v *View) ReOpen() {
 213         if v.CanClose("Continue? (yes, no, save) ") {
 214                 screen.Clear()
 215                 v.Buf.ReOpen()
 216                 v.Relocate()
 217                 v.matches = Match(v)
 218         }
 219 }
 220
 221 func (v *View) HSplit() bool {
 222         v.heightPercent /= 2
 223         v.Resize(screen.Size())
 224
 225         newView := NewViewWidthHeight(NewBuffer([]byte{}, ""), v.widthPercent, v.heightPercent)
 226         newView.TabNum = v.TabNum
 227         newView.y = v.y + v.height + 1
 228         newView.x = v.x
 229         tab := tabs[v.TabNum]
 230         tab.curView++
 231         newView.Num = len(tab.views)
 232         tab.views = append(tab.views, newView)
 233         return false
 234 }
 235
 236 func (v *View) VSplit() bool {
 237         v.widthPercent /= 2
 238         v.Resize(screen.Size())
 239
 240         newView := NewViewWidthHeight(NewBuffer([]byte{}, ""), v.widthPercent, v.heightPercent)
 241         newView.TabNum = v.TabNum
 242         newView.y = v.y
 243         newView.x = v.x + v.width
 244         tab := tabs[v.TabNum]
 245         tab.curView++
 246         newView.Num = len(tab.views)
 247         tab.views = append(tab.views, newView)
 248         return false
 249 }
 250
 251 // Relocate moves the view window so that the cursor is in view
 252 // This is useful if the user has scrolled far away, and then starts typing
 253 func (v *View) Relocate() bool {
 254         ret := false
 255         cy := v.Cursor.Y
 256         scrollmargin := int(settings["scrollmargin"].(float64))
 257         if cy < v.Topline+scrollmargin && cy > scrollmargin-1 {
 258                 v.Topline = cy - scrollmargin
 259                 ret = true
 260         } else if cy < v.Topline {
 261                 v.Topline = cy
 262                 ret = true
 263         }
 264         if cy > v.Topline+v.height-1-scrollmargin && cy < v.Buf.NumLines-scrollmargin {
 265                 v.Topline = cy - v.height + 1 + scrollmargin
 266                 ret = true
 267         } else if cy >= v.Buf.NumLines-scrollmargin && cy > v.height {
 268                 v.Topline = v.Buf.NumLines - v.height
 269                 ret = true
 270         }
 271
 272         cx := v.Cursor.GetVisualX()
 273         if cx < v.leftCol {
 274                 v.leftCol = cx
 275                 ret = true
 276         }
 277         if cx+v.lineNumOffset+1 > v.leftCol+v.width {
 278                 v.leftCol = cx - v.width + v.lineNumOffset + 1
 279                 ret = true
 280         }
 281         return ret
 282 }
 283
 284 // MoveToMouseClick moves the cursor to location x, y assuming x, y were given
 285 // by a mouse click
 286 func (v *View) MoveToMouseClick(x, y int) {
 287         if y-v.Topline > v.height-1 {
 288                 v.ScrollDown(1)
 289                 y = v.height + v.Topline - 1
 290         }
 291         if y >= v.Buf.NumLines {
 292                 y = v.Buf.NumLines - 1
 293         }
 294         if y < 0 {
 295                 y = 0
 296         }
 297         if x < 0 {
 298                 x = 0
 299         }
 300
 301         x = v.Cursor.GetCharPosInLine(y, x)
 302         if x > Count(v.Buf.Line(y)) {
 303                 x = Count(v.Buf.Line(y))
 304         }
 305         v.Cursor.X = x
 306         v.Cursor.Y = y
 307         v.Cursor.LastVisualX = v.Cursor.GetVisualX()
 308 }
 309
 310 // HandleEvent handles an event passed by the main loop
 311 func (v *View) HandleEvent(event tcell.Event) {
 312         // This bool determines whether the view is relocated at the end of the function
 313         // By default it's true because most events should cause a relocate
 314         relocate := true
 315
 316         v.Buf.CheckModTime()
 317
 318         switch e := event.(type) {
 319         case *tcell.EventResize:
 320                 // Window resized
 321                 v.Resize(e.Size())
 322         case *tcell.EventKey:
 323                 if e.Key() == tcell.KeyRune && (e.Modifiers() == 0 || e.Modifiers() == tcell.ModShift) {
 324                         // Insert a character
 325                         if v.Cursor.HasSelection() {
 326                                 v.Cursor.DeleteSelection()
 327                                 v.Cursor.ResetSelection()
 328                         }
 329                         v.Buf.Insert(v.Cursor.Loc, string(e.Rune()))
 330                         v.Cursor.Right()
 331
 332                         for _, pl := range loadedPlugins {
 333                                 err := Call(pl+".onRune", []string{string(e.Rune())})
 334                                 if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
 335                                         TermMessage(err)
 336                                 }
 337                         }
 338                 } else {
 339                         for key, actions := range bindings {
 340                                 if e.Key() == key.keyCode {
 341                                         if e.Key() == tcell.KeyRune {
 342                                                 if e.Rune() != key.r {
 343                                                         continue
 344                                                 }
 345                                         }
 346                                         if e.Modifiers() == key.modifiers {
 347                                                 relocate = false
 348                                                 for _, action := range actions {
 349                                                         relocate = action(v) || relocate
 350                                                         for _, pl := range loadedPlugins {
 351                                                                 funcName := strings.Split(runtime.FuncForPC(reflect.ValueOf(action).Pointer()).Name(), ".")
 352                                                                 err := Call(pl+".on"+funcName[len(funcName)-1], nil)
 353                                                                 if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
 354                                                                         TermMessage(err)
 355                                                                 }
 356                                                         }
 357                                                 }
 358                                         }
 359                                 }
 360                         }
 361                 }
 362         case *tcell.EventPaste:
 363                 if v.Cursor.HasSelection() {
 364                         v.Cursor.DeleteSelection()
 365                         v.Cursor.ResetSelection()
 366                 }
 367                 clip := e.Text()
 368                 v.Buf.Insert(v.Cursor.Loc, clip)
 369                 v.Cursor.Loc = v.Cursor.Loc.Move(Count(clip), v.Buf)
 370                 v.freshClip = false
 371         case *tcell.EventMouse:
 372                 x, y := e.Position()
 373                 x -= v.lineNumOffset - v.leftCol + v.x
 374                 y += v.Topline - v.y
 375                 // Don't relocate for mouse events
 376                 relocate = false
 377
 378                 button := e.Buttons()
 379
 380                 switch button {
 381                 case tcell.Button1:
 382                         // Left click
 383                         if v.mouseReleased {
 384                                 v.MoveToMouseClick(x, y)
 385                                 if time.Since(v.lastClickTime)/time.Millisecond < doubleClickThreshold {
 386                                         if v.doubleClick {
 387                                                 // Triple click
 388                                                 v.lastClickTime = time.Now()
 389
 390                                                 v.tripleClick = true
 391                                                 v.doubleClick = false
 392
 393                                                 v.Cursor.SelectLine()
 394                                         } else {
 395                                                 // Double click
 396                                                 v.lastClickTime = time.Now()
 397
 398                                                 v.doubleClick = true
 399                                                 v.tripleClick = false
 400
 401                                                 v.Cursor.SelectWord()
 402                                         }
 403                                 } else {
 404                                         v.doubleClick = false
 405                                         v.tripleClick = false
 406                                         v.lastClickTime = time.Now()
 407
 408                                         v.Cursor.OrigSelection[0] = v.Cursor.Loc
 409                                         v.Cursor.CurSelection[0] = v.Cursor.Loc
 410                                         v.Cursor.CurSelection[1] = v.Cursor.Loc
 411                                 }
 412                                 v.mouseReleased = false
 413                         } else if !v.mouseReleased {
 414                                 v.MoveToMouseClick(x, y)
 415                                 if v.tripleClick {
 416                                         v.Cursor.AddLineToSelection()
 417                                 } else if v.doubleClick {
 418                                         v.Cursor.AddWordToSelection()
 419                                 } else {
 420                                         v.Cursor.CurSelection[1] = v.Cursor.Loc
 421                                 }
 422                         }
 423                 case tcell.ButtonNone:
 424                         // Mouse event with no click
 425                         if !v.mouseReleased {
 426                                 // Mouse was just released
 427
 428                                 // Relocating here isn't really necessary because the cursor will
 429                                 // be in the right place from the last mouse event
 430                                 // However, if we are running in a terminal that doesn't support mouse motion
 431                                 // events, this still allows the user to make selections, except only after they
 432                                 // release the mouse
 433
 434                                 if !v.doubleClick && !v.tripleClick {
 435                                         v.MoveToMouseClick(x, y)
 436                                         v.Cursor.CurSelection[1] = v.Cursor.Loc
 437                                 }
 438                                 v.mouseReleased = true
 439                         }
 440                 case tcell.WheelUp:
 441                         // Scroll up
 442                         scrollspeed := int(settings["scrollspeed"].(float64))
 443                         v.ScrollUp(scrollspeed)
 444                 case tcell.WheelDown:
 445                         // Scroll down
 446                         scrollspeed := int(settings["scrollspeed"].(float64))
 447                         v.ScrollDown(scrollspeed)
 448                 }
 449         }
 450
 451         if relocate {
 452                 v.Relocate()
 453         }
 454         if settings["syntax"].(bool) {
 455                 v.matches = Match(v)
 456         }
 457 }
 458
 459 // GutterMessage creates a message in this view's gutter
 460 func (v *View) GutterMessage(section string, lineN int, msg string, kind int) {
 461         lineN--
 462         gutterMsg := GutterMessage{
 463                 lineNum: lineN,
 464                 msg:     msg,
 465                 kind:    kind,
 466         }
 467         for _, v := range v.messages {
 468                 for _, gmsg := range v {
 469                         if gmsg.lineNum == lineN {
 470                                 return
 471                         }
 472                 }
 473         }
 474         messages := v.messages[section]
 475         v.messages[section] = append(messages, gutterMsg)
 476 }
 477
 478 // ClearGutterMessages clears all gutter messages from a given section
 479 func (v *View) ClearGutterMessages(section string) {
 480         v.messages[section] = []GutterMessage{}
 481 }
 482
 483 // ClearAllGutterMessages clears all the gutter messages
 484 func (v *View) ClearAllGutterMessages() {
 485         for k := range v.messages {
 486                 v.messages[k] = []GutterMessage{}
 487         }
 488 }
 489
 490 func (v *View) drawCell(x, y int, ch rune, combc []rune, style tcell.Style) {
 491         if x >= v.x && x < v.x+v.width && y >= v.y && y < v.y+v.height {
 492                 screen.SetContent(x, y, ch, combc, style)
 493         }
 494 }
 495
 496 // DisplayView renders the view to the screen
 497 func (v *View) DisplayView() {
 498
 499         // The character number of the character in the top left of the screen
 500         charNum := Loc{0, v.Topline}
 501
 502         // Convert the length of buffer to a string, and get the length of the string
 503         // We are going to have to offset by that amount
 504         maxLineLength := len(strconv.Itoa(v.Buf.NumLines))
 505         // + 1 for the little space after the line number
 506         if settings["ruler"] == true {
 507                 v.lineNumOffset = maxLineLength + 1
 508         } else {
 509                 v.lineNumOffset = 0
 510         }
 511         highlightStyle := defStyle
 512
 513         var hasGutterMessages bool
 514         for _, v := range v.messages {
 515                 if len(v) > 0 {
 516                         hasGutterMessages = true
 517                 }
 518         }
 519         if hasGutterMessages {
 520                 v.lineNumOffset += 2
 521         }
 522
 523         if v.x != 0 {
 524                 // One space for the extra split divider
 525                 v.lineNumOffset++
 526         }
 527
 528         for lineN := 0; lineN < v.height; lineN++ {
 529                 x := v.x
 530                 if v.x != 0 {
 531                         // Draw the split divider
 532                         v.drawCell(x, lineN+v.y, ' ', nil, defStyle.Reverse(true))
 533                         x++
 534                 }
 535                 // If the buffer is smaller than the view height
 536                 if lineN+v.Topline >= v.Buf.NumLines {
 537                         // We have to clear all this space
 538                         for i := x; i < v.x+v.width; i++ {
 539                                 v.drawCell(i, lineN+v.y, ' ', nil, defStyle)
 540                         }
 541
 542                         continue
 543                 }
 544                 line := v.Buf.Line(lineN + v.Topline)
 545
 546                 if hasGutterMessages {
 547                         msgOnLine := false
 548                         for k := range v.messages {
 549                                 for _, msg := range v.messages[k] {
 550                                         if msg.lineNum == lineN+v.Topline {
 551                                                 msgOnLine = true
 552                                                 gutterStyle := defStyle
 553                                                 switch msg.kind {
 554                                                 case GutterInfo:
 555                                                         if style, ok := colorscheme["gutter-info"]; ok {
 556                                                                 gutterStyle = style
 557                                                         }
 558                                                 case GutterWarning:
 559                                                         if style, ok := colorscheme["gutter-warning"]; ok {
 560                                                                 gutterStyle = style
 561                                                         }
 562                                                 case GutterError:
 563                                                         if style, ok := colorscheme["gutter-error"]; ok {
 564                                                                 gutterStyle = style
 565                                                         }
 566                                                 }
 567                                                 v.drawCell(x, lineN+v.y, '>', nil, gutterStyle)
 568                                                 x++
 569                                                 v.drawCell(x, lineN+v.y, '>', nil, gutterStyle)
 570                                                 x++
 571                                                 if v.Cursor.Y == lineN+v.Topline {
 572                                                         messenger.Message(msg.msg)
 573                                                         messenger.gutterMessage = true
 574                                                 }
 575                                         }
 576                                 }
 577                         }
 578                         if !msgOnLine {
 579                                 v.drawCell(x, lineN+v.y, ' ', nil, defStyle)
 580                                 x++
 581                                 v.drawCell(x, lineN+v.y, ' ', nil, defStyle)
 582                                 x++
 583                                 if v.Cursor.Y == lineN+v.Topline && messenger.gutterMessage {
 584                                         messenger.Reset()
 585                                         messenger.gutterMessage = false
 586                                 }
 587                         }
 588                 }
 589
 590                 // Write the line number
 591                 lineNumStyle := defStyle
 592                 if style, ok := colorscheme["line-number"]; ok {
 593                         lineNumStyle = style
 594                 }
 595                 // Write the spaces before the line number if necessary
 596                 var lineNum string
 597                 if settings["ruler"] == true {
 598                         lineNum = strconv.Itoa(lineN + v.Topline + 1)
 599                         for i := 0; i < maxLineLength-len(lineNum); i++ {
 600                                 v.drawCell(x, lineN+v.y, ' ', nil, lineNumStyle)
 601                                 x++
 602                         }
 603                         // Write the actual line number
 604                         for _, ch := range lineNum {
 605                                 v.drawCell(x, lineN+v.y, ch, nil, lineNumStyle)
 606                                 x++
 607                         }
 608
 609                         if settings["ruler"] == true {
 610                                 // Write the extra space
 611                                 v.drawCell(x, lineN+v.y, ' ', nil, lineNumStyle)
 612                                 x++
 613                         }
 614                 }
 615                 // Write the line
 616                 for colN, ch := range line {
 617                         lineStyle := defStyle
 618
 619                         if settings["syntax"].(bool) {
 620                                 // Syntax highlighting is enabled
 621                                 highlightStyle = v.matches[lineN][colN]
 622                         }
 623
 624                         if v.Cursor.HasSelection() &&
 625                                 (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 626                                         charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 627
 628                                 lineStyle = defStyle.Reverse(true)
 629
 630                                 if style, ok := colorscheme["selection"]; ok {
 631                                         lineStyle = style
 632                                 }
 633                         } else {
 634                                 lineStyle = highlightStyle
 635                         }
 636
 637                         if settings["cursorline"].(bool) && !v.Cursor.HasSelection() && v.Cursor.Y == lineN+v.Topline {
 638                                 if style, ok := colorscheme["cursor-line"]; ok {
 639                                         fg, _, _ := style.Decompose()
 640                                         lineStyle = lineStyle.Background(fg)
 641                                 }
 642                         }
 643
 644                         if ch == '\t' {
 645                                 lineIndentStyle := defStyle
 646                                 if style, ok := colorscheme["indent-char"]; ok {
 647                                         lineIndentStyle = style
 648                                 }
 649                                 if v.Cursor.HasSelection() &&
 650                                         (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 651                                                 charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 652
 653                                         lineIndentStyle = defStyle.Reverse(true)
 654
 655                                         if style, ok := colorscheme["selection"]; ok {
 656                                                 lineIndentStyle = style
 657                                         }
 658                                 }
 659                                 if settings["cursorline"].(bool) && !v.Cursor.HasSelection() && v.Cursor.Y == lineN+v.Topline {
 660                                         if style, ok := colorscheme["cursor-line"]; ok {
 661                                                 fg, _, _ := style.Decompose()
 662                                                 lineIndentStyle = lineIndentStyle.Background(fg)
 663                                         }
 664                                 }
 665                                 indentChar := []rune(settings["indentchar"].(string))
 666                                 if x-v.leftCol >= v.lineNumOffset {
 667                                         v.drawCell(x-v.leftCol, lineN+v.y, indentChar[0], nil, lineIndentStyle)
 668                                 }
 669                                 tabSize := int(settings["tabsize"].(float64))
 670                                 for i := 0; i < tabSize-1; i++ {
 671                                         x++
 672                                         if x-v.leftCol >= v.lineNumOffset {
 673                                                 v.drawCell(x-v.leftCol, lineN+v.y, ' ', nil, lineStyle)
 674                                         }
 675                                 }
 676                         } else if runewidth.RuneWidth(ch) > 1 {
 677                                 if x-v.leftCol >= v.lineNumOffset {
 678                                         v.drawCell(x-v.leftCol, lineN+v.y, ch, nil, lineStyle)
 679                                 }
 680                                 for i := 0; i < runewidth.RuneWidth(ch)-1; i++ {
 681                                         x++
 682                                         if x-v.leftCol >= v.lineNumOffset {
 683                                                 v.drawCell(x-v.leftCol, lineN+v.y, ' ', nil, lineStyle)
 684                                         }
 685                                 }
 686                         } else {
 687                                 if x-v.leftCol >= v.lineNumOffset {
 688                                         v.drawCell(x-v.leftCol, lineN+v.y, ch, nil, lineStyle)
 689                                 }
 690                         }
 691                         charNum = charNum.Move(1, v.Buf)
 692                         x++
 693                 }
 694                 // Here we are at a newline
 695
 696                 // The newline may be selected, in which case we should draw the selection style
 697                 // with a space to represent it
 698                 if v.Cursor.HasSelection() &&
 699                         (charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
 700                                 charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
 701
 702                         selectStyle := defStyle.Reverse(true)
 703
 704                         if style, ok := colorscheme["selection"]; ok {
 705                                 selectStyle = style
 706                         }
 707                         v.drawCell(x-v.leftCol, lineN+v.y, ' ', nil, selectStyle)
 708                         x++
 709                 }
 710
 711                 charNum = charNum.Move(1, v.Buf)
 712
 713                 for i := 0; i < v.width-((x-v.x)-v.leftCol); i++ {
 714                         lineStyle := defStyle
 715                         if settings["cursorline"].(bool) && !v.Cursor.HasSelection() && v.Cursor.Y == lineN+v.Topline {
 716                                 if style, ok := colorscheme["cursor-line"]; ok {
 717                                         fg, _, _ := style.Decompose()
 718                                         lineStyle = lineStyle.Background(fg)
 719                                 }
 720                         }
 721                         if !(x-v.leftCol < v.lineNumOffset) {
 722                                 v.drawCell(x+i, lineN+v.y, ' ', nil, lineStyle)
 723                         }
 724                 }
 725         }
 726 }
 727
 728 // DisplayCursor draws the current buffer's cursor to the screen
 729 func (v *View) DisplayCursor() {
 730         // Don't draw the cursor if it is out of the viewport or if it has a selection
 731         if (v.Cursor.Y-v.Topline < 0 || v.Cursor.Y-v.Topline > v.height-1) || v.Cursor.HasSelection() {
 732                 screen.HideCursor()
 733         } else {
 734                 screen.ShowCursor(v.x+v.Cursor.GetVisualX()+v.lineNumOffset-v.leftCol, v.Cursor.Y-v.Topline+v.y)
 735         }
 736 }
 737
 738 // Display renders the view, the cursor, and statusline
 739 func (v *View) Display() {
 740         v.DisplayView()
 741         v.DisplayCursor()
 742         if settings["statusline"].(bool) {
 743                 v.sline.Display()
 744         }
 745 }