102 lines
2.6 KiB
Nim
102 lines
2.6 KiB
Nim
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import unicode
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import strutils
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import terminal
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import strformat
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import posix
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import keycodes
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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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maxRowsGoal: int # if terminal resizes, how to compute max rows
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# positive: it will set max rows to maxRowsGoal, or terminal height, whichever is lower
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# negative: it will set it to terminal height - maxRowsGoal or terminal height, whichever is lower
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# 0: terminal height
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# state reached during execution
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x: int # current cursor x position on screen
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bx: int # current x position in buffer (not same as x due to UTF-8)
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y: int # which row are we editing
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size: int # size of the row being edited in characters
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buffer: seq[string] # current text
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history: seq[seq[string]] # past texts
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historyIndex: int # where are we in history
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cols: int # number of columns in the terminal
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maxRows: int # max number of rows allowed
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# for editors
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var editors: seq[EditorState]
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# resize support
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onSignal(28):
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discard
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proc newEditor*(prompt: string = "> ", multiline: bool = true): EditorState =
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new(result)
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result.prompt = prompt
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result.maxRowsGoal = if multiline: 0 else: 1
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result.buffer.add("")
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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 render(ed: EditorState) =
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eraseLine()
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setCursorXPos(0)
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write stdout, ed.prompt
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write stdout, ed.buffer[ed.y]
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template cline(ed: EditorState): var string =
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ed.buffer[ed.y]
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proc read*(ed: EditorState): string =
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ed.render()
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while true:
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let key = getKey()
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case key:
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of jkEnter.int:
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break
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of jkBackspace.int:
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if ed.x == 0:
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discard # merge two lines TODO
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elif ed.x > ed.cline().high():
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ed.cline() = ed.cline[0..ed.cline().high()-1]
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dec ed.x
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dec ed.bx
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else:
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# TODO UTF8
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ed.cline() = ed.cline[0..ed.x-1] & ed.cline[ed.x+1..ed.cline().high()]
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dec ed.x
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dec ed.bx
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else:
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if key > 31 and key < 127:
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# ascii char
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let ch = key.char()
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if ed.x == 0:
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ed.cline() = $ch & ed.cline
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elif ed.x > ed.cline.high():
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ed.cline() = ed.cline & $ch
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else:
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ed.cline() = ed.cline[0..ed.x-1] & $ch & ed.cline[ed.x..ed.cline().high()]
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inc ed.x
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inc ed.bx
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ed.render()
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# return val
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result = ed.buffer.join("\n")
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# cleanup
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write(stdout, "\n")
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ed.history.add(ed.buffer)
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ed.buffer = @[""]
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ed.y = 0
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ed.x = 0
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