cmd/micro/view.go

   1 package main
   2
   3 import (
   4         "os"
   5         "strconv"
   6         "strings"
   7         "time"
   8
   9         "github.com/mitchellh/go-homedir"
  10         "github.com/zyedidia/tcell"
  11 )
  12
  13 type ViewType struct {
  14         kind     int
  15         readonly bool // The file cannot be edited
  16         scratch  bool // The file cannot be saved
  17 }
  18
  19 var (
  20         vtDefault = ViewType{0, false, false}
  21         vtHelp    = ViewType{1, true, true}
  22         vtLog     = ViewType{2, true, true}
  23         vtScratch = ViewType{3, false, true}
  24 )
  25
  26 // The View struct stores information about a view into a buffer.
  27 // It stores information about the cursor, and the viewport
  28 // that the user sees the buffer from.
  29 type View struct {
  30         // A pointer to the buffer's cursor for ease of access
  31         Cursor *Cursor
  32
  33         // The topmost line, used for vertical scrolling
  34         Topline int
  35         // The leftmost column, used for horizontal scrolling
  36         leftCol int
  37
  38         // Specifies whether or not this view holds a help buffer
  39         Type ViewType
  40
  41         // Actual width and height
  42         Width  int
  43         Height int
  44
  45         LockWidth  bool
  46         LockHeight bool
  47
  48         // Where this view is located
  49         x, y int
  50
  51         // How much to offset because of line numbers
  52         lineNumOffset int
  53
  54         // Holds the list of gutter messages
  55         messages map[string][]GutterMessage
  56
  57         // This is the index of this view in the views array
  58         Num int
  59         // What tab is this view stored in
  60         TabNum int
  61
  62         // The buffer
  63         Buf *Buffer
  64         // The statusline
  65         sline Statusline
  66
  67         // Since tcell doesn't differentiate between a mouse release event
  68         // and a mouse move event with no keys pressed, we need to keep
  69         // track of whether or not the mouse was pressed (or not released) last event to determine
  70         // mouse release events
  71         mouseReleased bool
  72
  73         // This stores when the last click was
  74         // This is useful for detecting double and triple clicks
  75         lastClickTime time.Time
  76
  77         // lastCutTime stores when the last ctrl+k was issued.
  78         // It is used for clearing the clipboard to replace it with fresh cut lines.
  79         lastCutTime time.Time
  80
  81         // freshClip returns true if the clipboard has never been pasted.
  82         freshClip bool
  83
  84         // Was the last mouse event actually a double click?
  85         // Useful for detecting triple clicks -- if a double click is detected
  86         // but the last mouse event was actually a double click, it's a triple click
  87         doubleClick bool
  88         // Same here, just to keep track for mouse move events
  89         tripleClick bool
  90
  91         cellview *CellView
  92
  93         splitNode *LeafNode
  94 }
  95
  96 // NewView returns a new fullscreen view
  97 func NewView(buf *Buffer) *View {
  98         screenW, screenH := screen.Size()
  99         return NewViewWidthHeight(buf, screenW, screenH)
 100 }
 101
 102 // NewViewWidthHeight returns a new view with the specified width and height
 103 // Note that w and h are raw column and row values
 104 func NewViewWidthHeight(buf *Buffer, w, h int) *View {
 105         v := new(View)
 106
 107         v.x, v.y = 0, 0
 108
 109         v.Width = w
 110         v.Height = h
 111         v.cellview = new(CellView)
 112
 113         v.ToggleTabbar()
 114
 115         v.OpenBuffer(buf)
 116
 117         v.messages = make(map[string][]GutterMessage)
 118
 119         v.sline = Statusline{
 120                 view: v,
 121         }
 122
 123         if v.Buf.Settings["statusline"].(bool) {
 124                 v.Height--
 125         }
 126
 127         for pl := range loadedPlugins {
 128                 _, err := Call(pl+".onViewOpen", v)
 129                 if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
 130                         TermMessage(err)
 131                         continue
 132                 }
 133         }
 134
 135         return v
 136 }
 137
 138 // ToggleStatusLine creates an extra row for the statusline if necessary
 139 func (v *View) ToggleStatusLine() {
 140         if v.Buf.Settings["statusline"].(bool) {
 141                 v.Height--
 142         } else {
 143                 v.Height++
 144         }
 145 }
 146
 147 // ToggleTabbar creates an extra row for the tabbar if necessary
 148 func (v *View) ToggleTabbar() {
 149         if len(tabs) > 1 {
 150                 if v.y == 0 {
 151                         // Include one line for the tab bar at the top
 152                         v.Height--
 153                         v.y = 1
 154                 }
 155         } else {
 156                 if v.y == 1 {
 157                         v.y = 0
 158                         v.Height++
 159                 }
 160         }
 161 }
 162
 163 func (v *View) paste(clip string) {
 164         leadingWS := GetLeadingWhitespace(v.Buf.Line(v.Cursor.Y))
 165
 166         if v.Cursor.HasSelection() {
 167                 v.Cursor.DeleteSelection()
 168                 v.Cursor.ResetSelection()
 169         }
 170         clip = strings.Replace(clip, "\n", "\n"+leadingWS, -1)
 171         v.Buf.Insert(v.Cursor.Loc, clip)
 172         v.Cursor.Loc = v.Cursor.Loc.Move(Count(clip), v.Buf)
 173         v.freshClip = false
 174         messenger.Message("Pasted clipboard")
 175 }
 176
 177 // ScrollUp scrolls the view up n lines (if possible)
 178 func (v *View) ScrollUp(n int) {
 179         // Try to scroll by n but if it would overflow, scroll by 1
 180         if v.Topline-n >= 0 {
 181                 v.Topline -= n
 182         } else if v.Topline > 0 {
 183                 v.Topline--
 184         }
 185 }
 186
 187 // ScrollDown scrolls the view down n lines (if possible)
 188 func (v *View) ScrollDown(n int) {
 189         // Try to scroll by n but if it would overflow, scroll by 1
 190         if v.Topline+n <= v.Buf.NumLines {
 191                 v.Topline += n
 192         } else if v.Topline < v.Buf.NumLines-1 {
 193                 v.Topline++
 194         }
 195 }
 196
 197 // CanClose returns whether or not the view can be closed
 198 // If there are unsaved changes, the user will be asked if the view can be closed
 199 // causing them to lose the unsaved changes
 200 func (v *View) CanClose() bool {
 201         if v.Type == vtDefault && v.Buf.IsModified {
 202                 var choice bool
 203                 var canceled bool
 204                 if v.Buf.Settings["autosave"].(bool) {
 205                         choice = true
 206                 } else {
 207                         choice, canceled = messenger.YesNoPrompt("Save changes to " + v.Buf.GetName() + " before closing? (y,n,esc) ")
 208                 }
 209                 if !canceled {
 210                         //if char == 'y' {
 211                         if choice {
 212                                 v.Save(true)
 213                                 return true
 214                         } else {
 215                                 return true
 216                         }
 217                 }
 218         } else {
 219                 return true
 220         }
 221         return false
 222 }
 223
 224 // OpenBuffer opens a new buffer in this view.
 225 // This resets the topline, event handler and cursor.
 226 func (v *View) OpenBuffer(buf *Buffer) {
 227         screen.Clear()
 228         v.CloseBuffer()
 229         v.Buf = buf
 230         v.Cursor = &buf.Cursor
 231         v.Topline = 0
 232         v.leftCol = 0
 233         v.Cursor.ResetSelection()
 234         v.Relocate()
 235         v.Center(false)
 236         v.messages = make(map[string][]GutterMessage)
 237
 238         // Set mouseReleased to true because we assume the mouse is not being pressed when
 239         // the editor is opened
 240         v.mouseReleased = true
 241         v.lastClickTime = time.Time{}
 242 }
 243
 244 // Open opens the given file in the view
 245 func (v *View) Open(filename string) {
 246         home, _ := homedir.Dir()
 247         filename = strings.Replace(filename, "~", home, 1)
 248         file, err := os.Open(filename)
 249         fileInfo, _ := os.Stat(filename)
 250
 251         if err == nil && fileInfo.IsDir() {
 252                 messenger.Error(filename, " is a directory")
 253                 return
 254         }
 255
 256         defer file.Close()
 257
 258         var buf *Buffer
 259         if err != nil {
 260                 messenger.Message(err.Error())
 261                 // File does not exist -- create an empty buffer with that name
 262                 buf = NewBufferFromString("", filename)
 263         } else {
 264                 buf = NewBuffer(file, FSize(file), filename)
 265         }
 266         v.OpenBuffer(buf)
 267 }
 268
 269 // CloseBuffer performs any closing functions on the buffer
 270 func (v *View) CloseBuffer() {
 271         if v.Buf != nil {
 272                 v.Buf.Serialize()
 273         }
 274 }
 275
 276 // ReOpen reloads the current buffer
 277 func (v *View) ReOpen() {
 278         if v.CanClose() {
 279                 screen.Clear()
 280                 v.Buf.ReOpen()
 281                 v.Relocate()
 282         }
 283 }
 284
 285 // HSplit opens a horizontal split with the given buffer
 286 func (v *View) HSplit(buf *Buffer) {
 287         i := 0
 288         if v.Buf.Settings["splitBottom"].(bool) {
 289                 i = 1
 290         }
 291         v.splitNode.HSplit(buf, v.Num+i)
 292 }
 293
 294 // VSplit opens a vertical split with the given buffer
 295 func (v *View) VSplit(buf *Buffer) {
 296         i := 0
 297         if v.Buf.Settings["splitRight"].(bool) {
 298                 i = 1
 299         }
 300         v.splitNode.VSplit(buf, v.Num+i)
 301 }
 302
 303 // HSplitIndex opens a horizontal split with the given buffer at the given index
 304 func (v *View) HSplitIndex(buf *Buffer, splitIndex int) {
 305         v.splitNode.HSplit(buf, splitIndex)
 306 }
 307
 308 // VSplitIndex opens a vertical split with the given buffer at the given index
 309 func (v *View) VSplitIndex(buf *Buffer, splitIndex int) {
 310         v.splitNode.VSplit(buf, splitIndex)
 311 }
 312
 313 // GetSoftWrapLocation gets the location of a visual click on the screen and converts it to col,line
 314 func (v *View) GetSoftWrapLocation(vx, vy int) (int, int) {
 315         if !v.Buf.Settings["softwrap"].(bool) {
 316                 if vy >= v.Buf.NumLines {
 317                         vy = v.Buf.NumLines - 1
 318                 }
 319                 vx = v.Cursor.GetCharPosInLine(vy, vx)
 320                 return vx, vy
 321         }
 322
 323         screenX, screenY := 0, v.Topline
 324         for lineN := v.Topline; lineN < v.Bottomline(); lineN++ {
 325                 line := v.Buf.Line(lineN)
 326                 if lineN >= v.Buf.NumLines {
 327                         return 0, v.Buf.NumLines - 1
 328                 }
 329
 330                 colN := 0
 331                 for _, ch := range line {
 332                         if screenX >= v.Width-v.lineNumOffset {
 333                                 screenX = 0
 334                                 screenY++
 335                         }
 336
 337                         if screenX == vx && screenY == vy {
 338                                 return colN, lineN
 339                         }
 340
 341                         if ch == '\t' {
 342                                 screenX += int(v.Buf.Settings["tabsize"].(float64)) - 1
 343                         }
 344
 345                         screenX++
 346                         colN++
 347                 }
 348                 if screenY == vy {
 349                         return colN, lineN
 350                 }
 351                 screenX = 0
 352                 screenY++
 353         }
 354
 355         return 0, 0
 356 }
 357
 358 func (v *View) Bottomline() int {
 359         if !v.Buf.Settings["softwrap"].(bool) {
 360                 return v.Topline + v.Height
 361         }
 362
 363         screenX, screenY := 0, 0
 364         numLines := 0
 365         for lineN := v.Topline; lineN < v.Topline+v.Height; lineN++ {
 366                 line := v.Buf.Line(lineN)
 367
 368                 colN := 0
 369                 for _, ch := range line {
 370                         if screenX >= v.Width-v.lineNumOffset {
 371                                 screenX = 0
 372                                 screenY++
 373                         }
 374
 375                         if ch == '\t' {
 376                                 screenX += int(v.Buf.Settings["tabsize"].(float64)) - 1
 377                         }
 378
 379                         screenX++
 380                         colN++
 381                 }
 382                 screenX = 0
 383                 screenY++
 384                 numLines++
 385
 386                 if screenY >= v.Height {
 387                         break
 388                 }
 389         }
 390         return numLines + v.Topline
 391 }
 392
 393 // Relocate moves the view window so that the cursor is in view
 394 // This is useful if the user has scrolled far away, and then starts typing
 395 func (v *View) Relocate() bool {
 396         height := v.Bottomline() - v.Topline
 397         ret := false
 398         cy := v.Cursor.Y
 399         scrollmargin := int(v.Buf.Settings["scrollmargin"].(float64))
 400         if cy < v.Topline+scrollmargin && cy > scrollmargin-1 {
 401                 v.Topline = cy - scrollmargin
 402                 ret = true
 403         } else if cy < v.Topline {
 404                 v.Topline = cy
 405                 ret = true
 406         }
 407         if cy > v.Topline+height-1-scrollmargin && cy < v.Buf.NumLines-scrollmargin {
 408                 v.Topline = cy - height + 1 + scrollmargin
 409                 ret = true
 410         } else if cy >= v.Buf.NumLines-scrollmargin && cy > height {
 411                 v.Topline = v.Buf.NumLines - height
 412                 ret = true
 413         }
 414
 415         if !v.Buf.Settings["softwrap"].(bool) {
 416                 cx := v.Cursor.GetVisualX()
 417                 if cx < v.leftCol {
 418                         v.leftCol = cx
 419                         ret = true
 420                 }
 421                 if cx+v.lineNumOffset+1 > v.leftCol+v.Width {
 422                         v.leftCol = cx - v.Width + v.lineNumOffset + 1
 423                         ret = true
 424                 }
 425         }
 426         return ret
 427 }
 428
 429 // MoveToMouseClick moves the cursor to location x, y assuming x, y were given
 430 // by a mouse click
 431 func (v *View) MoveToMouseClick(x, y int) {
 432         if y-v.Topline > v.Height-1 {
 433                 v.ScrollDown(1)
 434                 y = v.Height + v.Topline - 1
 435         }
 436         if y < 0 {
 437                 y = 0
 438         }
 439         if x < 0 {
 440                 x = 0
 441         }
 442
 443         x, y = v.GetSoftWrapLocation(x, y)
 444         // x = v.Cursor.GetCharPosInLine(y, x)
 445         if x > Count(v.Buf.Line(y)) {
 446                 x = Count(v.Buf.Line(y))
 447         }
 448         v.Cursor.X = x
 449         v.Cursor.Y = y
 450         v.Cursor.LastVisualX = v.Cursor.GetVisualX()
 451 }
 452
 453 // HandleEvent handles an event passed by the main loop
 454 func (v *View) HandleEvent(event tcell.Event) {
 455         // This bool determines whether the view is relocated at the end of the function
 456         // By default it's true because most events should cause a relocate
 457         relocate := true
 458
 459         v.Buf.CheckModTime()
 460
 461         switch e := event.(type) {
 462         case *tcell.EventKey:
 463                 // Check first if input is a key binding, if it is we 'eat' the input and don't insert a rune
 464                 isBinding := false
 465                 readonlyBindingsList := []string{"Delete", "Insert", "Backspace", "Cut", "Play", "Paste", "Move", "Add", "DuplicateLine", "Macro"}
 466                 if e.Key() != tcell.KeyRune || e.Modifiers() != 0 {
 467                         for key, actions := range bindings {
 468                                 if e.Key() == key.keyCode {
 469                                         if e.Key() == tcell.KeyRune {
 470                                                 if e.Rune() != key.r {
 471                                                         continue
 472                                                 }
 473                                         }
 474                                         if e.Modifiers() == key.modifiers {
 475                                                 relocate = false
 476                                                 isBinding = true
 477                                                 for _, action := range actions {
 478                                                         readonlyBindingsResult := false
 479                                                         funcName := ShortFuncName(action)
 480                                                         if v.Type.readonly == true {
 481                                                                 // check for readonly and if true only let key bindings get called if they do not change the contents.
 482                                                                 for _, readonlyBindings := range readonlyBindingsList {
 483                                                                         if strings.Contains(funcName, readonlyBindings) {
 484                                                                                 readonlyBindingsResult = true
 485                                                                         }
 486                                                                 }
 487                                                         }
 488                                                         if !readonlyBindingsResult {
 489                                                                 // call the key binding
 490                                                                 relocate = action(v, true) || relocate
 491                                                                 // Macro
 492                                                                 if funcName != "ToggleMacro" && funcName != "PlayMacro" {
 493                                                                         if recordingMacro {
 494                                                                                 curMacro = append(curMacro, action)
 495                                                                         }
 496                                                                 }
 497                                                         }
 498                                                 }
 499                                                 break
 500                                         }
 501                                 }
 502                         }
 503                 }
 504                 if !isBinding && e.Key() == tcell.KeyRune {
 505                         // Check viewtype if readonly don't insert a rune (readonly help and log view etc.)
 506                         if v.Type.readonly == false {
 507                                 // Insert a character
 508                                 if v.Cursor.HasSelection() {
 509                                         v.Cursor.DeleteSelection()
 510                                         v.Cursor.ResetSelection()
 511                                 }
 512                                 v.Buf.Insert(v.Cursor.Loc, string(e.Rune()))
 513                                 v.Cursor.Right()
 514
 515                                 for pl := range loadedPlugins {
 516                                         _, err := Call(pl+".onRune", string(e.Rune()), v)
 517                                         if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
 518                                                 TermMessage(err)
 519                                         }
 520                                 }
 521
 522                                 if recordingMacro {
 523                                         curMacro = append(curMacro, e.Rune())
 524                                 }
 525                         }
 526                 }
 527         case *tcell.EventPaste:
 528                 // Check viewtype if readonly don't paste (readonly help and log view etc.)
 529                 if v.Type.readonly == false {
 530                         if !PreActionCall("Paste", v) {
 531                                 break
 532                         }
 533
 534                         v.paste(e.Text())
 535
 536                         PostActionCall("Paste", v)
 537                 }
 538         case *tcell.EventMouse:
 539                 x, y := e.Position()
 540                 x -= v.lineNumOffset - v.leftCol + v.x
 541                 y += v.Topline - v.y
 542                 // Don't relocate for mouse events
 543                 relocate = false
 544
 545                 button := e.Buttons()
 546
 547                 switch button {
 548                 case tcell.Button1:
 549                         // Left click
 550                         if v.mouseReleased {
 551                                 v.MoveToMouseClick(x, y)
 552                                 if time.Since(v.lastClickTime)/time.Millisecond < doubleClickThreshold {
 553                                         if v.doubleClick {
 554                                                 // Triple click
 555                                                 v.lastClickTime = time.Now()
 556
 557                                                 v.tripleClick = true
 558                                                 v.doubleClick = false
 559
 560                                                 v.Cursor.SelectLine()
 561                                                 v.Cursor.CopySelection("primary")
 562                                         } else {
 563                                                 // Double click
 564                                                 v.lastClickTime = time.Now()
 565
 566                                                 v.doubleClick = true
 567                                                 v.tripleClick = false
 568
 569                                                 v.Cursor.SelectWord()
 570                                                 v.Cursor.CopySelection("primary")
 571                                         }
 572                                 } else {
 573                                         v.doubleClick = false
 574                                         v.tripleClick = false
 575                                         v.lastClickTime = time.Now()
 576
 577                                         v.Cursor.OrigSelection[0] = v.Cursor.Loc
 578                                         v.Cursor.CurSelection[0] = v.Cursor.Loc
 579                                         v.Cursor.CurSelection[1] = v.Cursor.Loc
 580                                 }
 581                                 v.mouseReleased = false
 582                         } else if !v.mouseReleased {
 583                                 v.MoveToMouseClick(x, y)
 584                                 if v.tripleClick {
 585                                         v.Cursor.AddLineToSelection()
 586                                 } else if v.doubleClick {
 587                                         v.Cursor.AddWordToSelection()
 588                                 } else {
 589                                         v.Cursor.SetSelectionEnd(v.Cursor.Loc)
 590                                         v.Cursor.CopySelection("primary")
 591                                 }
 592                         }
 593                 case tcell.Button2:
 594                         // Check viewtype if readonly don't paste (readonly help and log view etc.)
 595                         if v.Type.readonly == false {
 596                                 // Middle mouse button was clicked,
 597                                 // We should paste primary
 598                                 v.PastePrimary(true)
 599                         }
 600                 case tcell.ButtonNone:
 601                         // Mouse event with no click
 602                         if !v.mouseReleased {
 603                                 // Mouse was just released
 604
 605                                 // Relocating here isn't really necessary because the cursor will
 606                                 // be in the right place from the last mouse event
 607                                 // However, if we are running in a terminal that doesn't support mouse motion
 608                                 // events, this still allows the user to make selections, except only after they
 609                                 // release the mouse
 610
 611                                 if !v.doubleClick && !v.tripleClick {
 612                                         v.MoveToMouseClick(x, y)
 613                                         v.Cursor.SetSelectionEnd(v.Cursor.Loc)
 614                                         v.Cursor.CopySelection("primary")
 615                                 }
 616                                 v.mouseReleased = true
 617                         }
 618                 case tcell.WheelUp:
 619                         // Scroll up
 620                         scrollspeed := int(v.Buf.Settings["scrollspeed"].(float64))
 621                         v.ScrollUp(scrollspeed)
 622                 case tcell.WheelDown:
 623                         // Scroll down
 624                         scrollspeed := int(v.Buf.Settings["scrollspeed"].(float64))
 625                         v.ScrollDown(scrollspeed)
 626                 }
 627         }
 628
 629         if relocate {
 630                 v.Relocate()
 631                 // We run relocate again because there's a bug with relocating with softwrap
 632                 // when for example you jump to the bottom of the buffer and it tries to
 633                 // calculate where to put the topline so that the bottom line is at the bottom
 634                 // of the terminal and it runs into problems with visual lines vs real lines.
 635                 // This is (hopefully) a temporary solution
 636                 v.Relocate()
 637         }
 638 }
 639
 640 // GutterMessage creates a message in this view's gutter
 641 func (v *View) GutterMessage(section string, lineN int, msg string, kind int) {
 642         lineN--
 643         gutterMsg := GutterMessage{
 644                 lineNum: lineN,
 645                 msg:     msg,
 646                 kind:    kind,
 647         }
 648         for _, v := range v.messages {
 649                 for _, gmsg := range v {
 650                         if gmsg.lineNum == lineN {
 651                                 return
 652                         }
 653                 }
 654         }
 655         messages := v.messages[section]
 656         v.messages[section] = append(messages, gutterMsg)
 657 }
 658
 659 // ClearGutterMessages clears all gutter messages from a given section
 660 func (v *View) ClearGutterMessages(section string) {
 661         v.messages[section] = []GutterMessage{}
 662 }
 663
 664 // ClearAllGutterMessages clears all the gutter messages
 665 func (v *View) ClearAllGutterMessages() {
 666         for k := range v.messages {
 667                 v.messages[k] = []GutterMessage{}
 668         }
 669 }
 670
 671 // Opens the given help page in a new horizontal split
 672 func (v *View) openHelp(helpPage string) {
 673         if data, err := FindRuntimeFile(RTHelp, helpPage).Data(); err != nil {
 674                 TermMessage("Unable to load help text", helpPage, "\n", err)
 675         } else {
 676                 helpBuffer := NewBufferFromString(string(data), helpPage+".md")
 677                 helpBuffer.name = "Help"
 678
 679                 if v.Type == vtHelp {
 680                         v.OpenBuffer(helpBuffer)
 681                 } else {
 682                         v.HSplit(helpBuffer)
 683                         CurView().Type = vtHelp
 684                 }
 685         }
 686 }
 687
 688 func (v *View) DisplayView() {
 689         if v.Buf.Settings["softwrap"].(bool) && v.leftCol != 0 {
 690                 v.leftCol = 0
 691         }
 692
 693         if v.Type == vtLog {
 694                 // Log views should always follow the cursor...
 695                 v.Relocate()
 696         }
 697
 698         // We need to know the string length of the largest line number
 699         // so we can pad appropriately when displaying line numbers
 700         maxLineNumLength := len(strconv.Itoa(v.Buf.NumLines))
 701
 702         if v.Buf.Settings["ruler"] == true {
 703                 // + 1 for the little space after the line number
 704                 v.lineNumOffset = maxLineNumLength + 1
 705         } else {
 706                 v.lineNumOffset = 0
 707         }
 708
 709         // We need to add to the line offset if there are gutter messages
 710         var hasGutterMessages bool
 711         for _, v := range v.messages {
 712                 if len(v) > 0 {
 713                         hasGutterMessages = true
 714                 }
 715         }
 716         if hasGutterMessages {
 717                 v.lineNumOffset += 2
 718         }
 719
 720         divider := 0
 721         if v.x != 0 {
 722                 // One space for the extra split divider
 723                 v.lineNumOffset++
 724                 divider = 1
 725         }
 726
 727         xOffset := v.x + v.lineNumOffset
 728         yOffset := v.y
 729
 730         height := v.Height
 731         width := v.Width
 732         left := v.leftCol
 733         top := v.Topline
 734
 735         v.cellview.Draw(v.Buf, top, height, left, width-v.lineNumOffset)
 736
 737         screenX := v.x
 738         realLineN := top - 1
 739         visualLineN := 0
 740         var line []*Char
 741         for visualLineN, line = range v.cellview.lines {
 742                 var firstChar *Char
 743                 if len(line) > 0 {
 744                         firstChar = line[0]
 745                 }
 746
 747                 var softwrapped bool
 748                 if firstChar != nil {
 749                         if firstChar.realLoc.Y == realLineN {
 750                                 softwrapped = true
 751                         }
 752                         realLineN = firstChar.realLoc.Y
 753                 } else {
 754                         realLineN++
 755                 }
 756
 757                 colorcolumn := int(v.Buf.Settings["colorcolumn"].(float64))
 758                 if colorcolumn != 0 {
 759                         style := GetColor("color-column")
 760                         fg, _, _ := style.Decompose()
 761                         st := defStyle.Background(fg)
 762                         screen.SetContent(xOffset+colorcolumn, yOffset+visualLineN, ' ', nil, st)
 763                 }
 764
 765                 screenX = v.x
 766
 767                 // If there are gutter messages we need to display the '>>' symbol here
 768                 if hasGutterMessages {
 769                         // msgOnLine stores whether or not there is a gutter message on this line in particular
 770                         msgOnLine := false
 771                         for k := range v.messages {
 772                                 for _, msg := range v.messages[k] {
 773                                         if msg.lineNum == realLineN {
 774                                                 msgOnLine = true
 775                                                 gutterStyle := defStyle
 776                                                 switch msg.kind {
 777                                                 case GutterInfo:
 778                                                         if style, ok := colorscheme["gutter-info"]; ok {
 779                                                                 gutterStyle = style
 780                                                         }
 781                                                 case GutterWarning:
 782                                                         if style, ok := colorscheme["gutter-warning"]; ok {
 783                                                                 gutterStyle = style
 784                                                         }
 785                                                 case GutterError:
 786                                                         if style, ok := colorscheme["gutter-error"]; ok {
 787                                                                 gutterStyle = style
 788                                                         }
 789                                                 }
 790                                                 screen.SetContent(screenX, yOffset+visualLineN, '>', nil, gutterStyle)
 791                                                 screenX++
 792                                                 screen.SetContent(screenX, yOffset+visualLineN, '>', nil, gutterStyle)
 793                                                 screenX++
 794                                                 if v.Cursor.Y == realLineN && !messenger.hasPrompt {
 795                                                         messenger.Message(msg.msg)
 796                                                         messenger.gutterMessage = true
 797                                                 }
 798                                         }
 799                                 }
 800                         }
 801                         // If there is no message on this line we just display an empty offset
 802                         if !msgOnLine {
 803                                 screen.SetContent(screenX, yOffset+visualLineN, ' ', nil, defStyle)
 804                                 screenX++
 805                                 screen.SetContent(screenX, yOffset+visualLineN, ' ', nil, defStyle)
 806                                 screenX++
 807                                 if v.Cursor.Y == realLineN && messenger.gutterMessage {
 808                                         messenger.Reset()
 809                                         messenger.gutterMessage = false
 810                                 }
 811                         }
 812                 }
 813
 814                 lineNumStyle := defStyle
 815                 if v.Buf.Settings["ruler"] == true {
 816                         // Write the line number
 817                         if style, ok := colorscheme["line-number"]; ok {
 818                                 lineNumStyle = style
 819                         }
 820                         if style, ok := colorscheme["current-line-number"]; ok {
 821                                 if realLineN == v.Cursor.Y && tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() {
 822                                         lineNumStyle = style
 823                                 }
 824                         }
 825
 826                         lineNum := strconv.Itoa(realLineN + 1)
 827
 828                         // Write the spaces before the line number if necessary
 829                         for i := 0; i < maxLineNumLength-len(lineNum); i++ {
 830                                 screen.SetContent(screenX+divider, yOffset+visualLineN, ' ', nil, lineNumStyle)
 831                                 screenX++
 832                         }
 833                         if softwrapped && visualLineN != 0 {
 834                                 // Pad without the line number because it was written on the visual line before
 835                                 for range lineNum {
 836                                         screen.SetContent(screenX+divider, yOffset+visualLineN, ' ', nil, lineNumStyle)
 837                                         screenX++
 838                                 }
 839                         } else {
 840                                 // Write the actual line number
 841                                 for _, ch := range lineNum {
 842                                         screen.SetContent(screenX+divider, yOffset+visualLineN, ch, nil, lineNumStyle)
 843                                         screenX++
 844                                 }
 845                         }
 846
 847                         // Write the extra space
 848                         screen.SetContent(screenX+divider, yOffset+visualLineN, ' ', nil, lineNumStyle)
 849                         screenX++
 850                 }
 851
 852                 var lastChar *Char
 853                 cursorSet := false
 854                 for _, char := range line {
 855                         if char != nil {
 856                                 lineStyle := char.style
 857
 858                                 colorcolumn := int(v.Buf.Settings["colorcolumn"].(float64))
 859                                 if colorcolumn != 0 && char.visualLoc.X == colorcolumn {
 860                                         style := GetColor("color-column")
 861                                         fg, _, _ := style.Decompose()
 862                                         lineStyle = lineStyle.Background(fg)
 863                                 }
 864
 865                                 charLoc := char.realLoc
 866                                 if v.Cursor.HasSelection() &&
 867                                         (charLoc.GreaterEqual(v.Cursor.CurSelection[0]) && charLoc.LessThan(v.Cursor.CurSelection[1]) ||
 868                                                 charLoc.LessThan(v.Cursor.CurSelection[0]) && charLoc.GreaterEqual(v.Cursor.CurSelection[1])) {
 869                                         // The current character is selected
 870                                         lineStyle = defStyle.Reverse(true)
 871
 872                                         if style, ok := colorscheme["selection"]; ok {
 873                                                 lineStyle = style
 874                                         }
 875                                 }
 876
 877                                 if tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() &&
 878                                         v.Cursor.Y == char.realLoc.Y && v.Cursor.X == char.realLoc.X && !cursorSet {
 879                                         screen.ShowCursor(xOffset+char.visualLoc.X, yOffset+char.visualLoc.Y)
 880                                         cursorSet = true
 881                                 }
 882
 883                                 if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].CurView == v.Num &&
 884                                         !v.Cursor.HasSelection() && v.Cursor.Y == realLineN {
 885                                         style := GetColor("cursor-line")
 886                                         fg, _, _ := style.Decompose()
 887                                         lineStyle = lineStyle.Background(fg)
 888                                 }
 889
 890                                 screen.SetContent(xOffset+char.visualLoc.X, yOffset+char.visualLoc.Y, char.drawChar, nil, lineStyle)
 891
 892                                 lastChar = char
 893                         }
 894                 }
 895
 896                 lastX := 0
 897                 var realLoc Loc
 898                 var visualLoc Loc
 899                 var cx, cy int
 900                 if lastChar != nil {
 901                         lastX = xOffset + lastChar.visualLoc.X + lastChar.width
 902                         if tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() &&
 903                                 v.Cursor.Y == lastChar.realLoc.Y && v.Cursor.X == lastChar.realLoc.X+1 {
 904                                 screen.ShowCursor(lastX, yOffset+lastChar.visualLoc.Y)
 905                                 cx, cy = lastX, yOffset+lastChar.visualLoc.Y
 906                         }
 907                         realLoc = Loc{lastChar.realLoc.X, realLineN}
 908                         visualLoc = Loc{lastX - xOffset, lastChar.visualLoc.Y}
 909                 } else if len(line) == 0 {
 910                         if tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() &&
 911                                 v.Cursor.Y == realLineN {
 912                                 screen.ShowCursor(xOffset, yOffset+visualLineN)
 913                                 cx, cy = xOffset, yOffset+visualLineN
 914                         }
 915                         lastX = xOffset
 916                         realLoc = Loc{0, realLineN}
 917                         visualLoc = Loc{0, visualLineN}
 918                 }
 919
 920                 if v.Cursor.HasSelection() &&
 921                         (realLoc.GreaterEqual(v.Cursor.CurSelection[0]) && realLoc.LessThan(v.Cursor.CurSelection[1]) ||
 922                                 realLoc.LessThan(v.Cursor.CurSelection[0]) && realLoc.GreaterEqual(v.Cursor.CurSelection[1])) {
 923                         // The current character is selected
 924                         selectStyle := defStyle.Reverse(true)
 925
 926                         if style, ok := colorscheme["selection"]; ok {
 927                                 selectStyle = style
 928                         }
 929                         screen.SetContent(xOffset+visualLoc.X, yOffset+visualLoc.Y, ' ', nil, selectStyle)
 930                 }
 931
 932                 if v.Buf.Settings["cursorline"].(bool) && tabs[curTab].CurView == v.Num &&
 933                         !v.Cursor.HasSelection() && v.Cursor.Y == realLineN {
 934                         for i := lastX; i < xOffset+v.Width; i++ {
 935                                 style := GetColor("cursor-line")
 936                                 fg, _, _ := style.Decompose()
 937                                 style = style.Background(fg)
 938                                 if !(tabs[curTab].CurView == v.Num && !v.Cursor.HasSelection() && i == cx && yOffset+visualLineN == cy) {
 939                                         screen.SetContent(i, yOffset+visualLineN, ' ', nil, style)
 940                                 }
 941                         }
 942                 }
 943         }
 944
 945         if divider != 0 {
 946                 dividerStyle := defStyle
 947                 if style, ok := colorscheme["divider"]; ok {
 948                         dividerStyle = style
 949                 }
 950                 for i := 0; i < v.Height; i++ {
 951                         screen.SetContent(v.x, yOffset+i, '|', nil, dividerStyle.Reverse(true))
 952                 }
 953         }
 954 }
 955
 956 // Display renders the view, the cursor, and statusline
 957 func (v *View) Display() {
 958         if globalSettings["termtitle"].(bool) {
 959                 screen.SetTitle("micro: " + v.Buf.GetName())
 960         }
 961         v.DisplayView()
 962         // Don't draw the cursor if it is out of the viewport or if it has a selection
 963         if v.Num == tabs[curTab].CurView && (v.Cursor.Y-v.Topline < 0 || v.Cursor.Y-v.Topline > v.Height-1 || v.Cursor.HasSelection()) {
 964                 screen.HideCursor()
 965         }
 966         _, screenH := screen.Size()
 967         if v.Buf.Settings["statusline"].(bool) {
 968                 v.sline.Display()
 969         } else if (v.y + v.Height) != screenH-1 {
 970                 for x := 0; x < v.Width; x++ {
 971                         screen.SetContent(v.x+x, v.y+v.Height, '-', nil, defStyle.Reverse(true))
 972                 }
 973         }
 974 }