157 lines
4.3 KiB
Nim
157 lines
4.3 KiB
Nim
import posix
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import unicode
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import terminalUtils/buffer
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import terminalUtils/terminalGetInfo
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import terminalUtils/keycodes
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import textBuffer
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import renderer
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type
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EditorState* = ref object
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# config
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prompt: string # prompt to display
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textBuffer: TextBuffer # current text
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termBuffer: Buffer
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history: seq[TextBuffer] # past texts
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historyIndex: int # where are we in history
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scroll: Scroll
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active: bool
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# screen properties passed to renderer
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width, height: int
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cursorY: int
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EditorResult* = enum
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erError, erEnter, erCtrlC, erCtrlD
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# for editors
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var editors: seq[EditorState]
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proc redraw*(ed: EditorState): int =
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render(ed.textBuffer, ed.termBuffer, ed.prompt, ed.scroll, ed.width, ed.height, ed.cursorY)
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# resize support
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onSignal(28):
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let nh = termGetHeight()
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let nw = termGetWidth()
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for ed in editors:
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ed.width = nw
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ed.height = nh
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if ed.active:
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discard ed.redraw()
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proc newEditor*(prompt: string = "> "): EditorState =
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new(result)
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let (_, cursorY) = termGetCursorPos(stdout)
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result.cursorY = cursorY
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result.width = termGetWidth()
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result.height = termGetHeight()
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result.prompt = prompt
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result.active = false
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editors.add(result)
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proc destroyEditor*(oldEditor: EditorState) =
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for i in 0..editors.high():
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let ed = editors[i]
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if ed == oldEditor:
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editors.del(i)
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return
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proc read*(ed: EditorState): (EditorResult, string) =
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var editorResult = erError
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ed.termBuffer = newBuffer(0, ed.cursorY, termGetWidth(), 1, stdout)
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ed.textBuffer = newTextBuffer()
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ed.history.add(ed.textBuffer)
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ed.historyIndex = ed.history.high()
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ed.scroll = new(Scroll)
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ed.active = true
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var lastRenderLines = 0
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template moveInHistory(delta: int) =
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let newHistoryIndex = min(max(ed.historyIndex + delta, 0), ed.history.high())
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if newHistoryIndex != ed.historyIndex:
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ed.textBuffer = ed.history[newHistoryIndex]
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ed.scroll.reset()
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ed.historyIndex = newHistoryIndex
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while true:
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lastRenderLines = ed.redraw()
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let (getKeyResult, key) = getKey()
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case getKeyResult:
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of gkChar:
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ed.textBuffer.insertRune(key.uint32().Rune())
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of gkControl:
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let control = key.JaleKeycode()
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case control:
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of jkEnter:
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if ed.textBuffer.isLineEmpty() and ed.textBuffer.isLastLine():
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ed.textBuffer.stripFinalNewline()
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editorResult = erEnter
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break
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else:
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ed.textBuffer.enter()
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of {jkBackspace, jkAltBackspace}:
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ed.textBuffer.backspace()
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of jkDelete:
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ed.textBuffer.delete()
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of jkCtrlC: # ctrl+c
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editorResult = erCtrlC
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break
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of jkCtrlD: # ctrl+d
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if ed.textBuffer.isEmpty():
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editorResult = erCtrlD
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break
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of jkLeft:
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ed.textBuffer.moveCursor(-1, 0)
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of jkRight:
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ed.textBuffer.moveCursor(1, 0)
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of jkDown:
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if ed.textBuffer.isLastLine():
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moveInHistory(1)
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else:
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ed.textBuffer.moveCursor(0, 1)
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of jkUp:
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if ed.textBuffer.isFistLine():
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moveInHistory(-1)
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else:
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ed.textBuffer.moveCursor(0, -1)
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of jkEnd:
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ed.textBuffer.moveToEnd(true)
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of jkHome:
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ed.textBuffer.moveToEnd(false)
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of jkPageDown:
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let termHeight = termGetHeight()
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ed.textBuffer.moveCursor(0, termHeight div 2)
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of jkPageUp:
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let termHeight = termGetHeight()
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ed.textBuffer.moveCursor(0, -(termHeight div 2))
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of jkCtrlDown:
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ed.textBuffer.newLine()
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else:
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discard # not implemented
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# stop redraws on resize
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ed.active = false
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# return val, strip final newline (due to how double enter is how you enter)
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let cont = ed.textBuffer.getContent()
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if editorResult == erError:
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raise newException(Defect, "Editor loop quit without setting editor result.")
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result = (editorResult, cont)
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# cleanup
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stdout.write("\n")
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ed.cursorY = min(ed.height-1, ed.cursorY + lastRenderLines)
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# don't add empty lines to history
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if ed.history[ed.history.high()].getContent() == "":
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ed.history.del(ed.history.high())
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proc updateCursorPos*(ed: EditorState) =
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let (_, cursorY) = termGetCursorPos(stdout)
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ed.cursorY = cursorY
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