core/line.nim
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import critbits, terminal # getch/putch implementations when defined(windows): proc getchar(): cint {.header: "<conio.h>", importc: "_getch".} proc putchar(c: cint): cint {.discardable, header: "<conio.h>", importc: "_putch".} proc termSetup*() = discard proc termSave*(): string = return "" proc termRestore*(c: string) = discard else: import osproc proc termSetup*() = discard execCmd "stty </dev/tty -icanon -echo -isig -iexten" proc termSave*(): string = let res = execCmdEx "stty </dev/tty -g" return res[0] proc termRestore*(c: string) = discard execCmd "stty </dev/tty " & c proc getchar(): cint = return stdin.readChar().ord.cint proc putchar(c: cint) = stdout.write(c.chr) # Types type Key* = int KeySeq* = seq[Key] LineError* = ref Exception LineEditorMode* = enum mdInsert mdReplace Line* = object text*: string position*: int KeyCallback* = proc(ed: var LineEditor) LineEditor* = object history: seq[string] line*: Line mode*: LineEditorMode proc len*(line: Line): int = return line.text.len proc empty*(line: Line): bool = return line.text.len == 0 proc full*(line: Line): bool = return line.position >= line.text.len proc first*(line: Line): int = if line.empty: raise LineError(msg: "Line is empty!") return 0 proc last*(line: Line): int = if line.empty: raise LineError(msg: "Line is empty!") return line.text.len-1 proc fromFirst*(line: var Line): string = if line.empty: raise LineError(msg: "Line is empty!") return line.text[line.first..line.position-1] proc toLast*(line: var Line): string = if line.empty: raise LineError(msg: "Line is empty!") return line.text[line.position..line.last] proc back*(ed: var LineEditor, n=1) = if ed.line.empty: return stdout.cursorBackward(n) ed.line.position = ed.line.position - n proc forward*(ed: var LineEditor, n=1) = if ed.line.full: return stdout.cursorForward(n) ed.line.position += n proc deletePrevious*(ed: var LineEditor) = if not ed.line.empty: if ed.line.full: stdout.cursorBackward putchar(32) stdout.cursorBackward ed.line.text = ed.line.text[0..ed.line.last-1] else: let rest = ed.line.toLast & " " ed.back for i in rest: putchar i.ord ed.line.text = ed.line.fromFirst & ed.line.text[ed.line.position+1..ed.line.last] stdout.cursorBackward(rest.len) proc deleteNext*(ed: var LineEditor) = if not ed.line.empty: if not ed.line.full: let rest = ed.line.toLast[1..^1] & " " for c in rest: putchar c.ord stdout.cursorBackward(rest.len) ed.line.text = ed.line.fromFirst & ed.line.toLast[1..^1] proc printChar*(ed: var LineEditor, c: int) = if ed.line.full: putchar(c.cint) ed.line.text &= c.chr ed.line.position += 1 else: if ed.mode == mdInsert: putchar(c.cint) let rest = ed.line.toLast ed.line.text.insert($c.chr, ed.line.position) ed.line.position += 1 for j in rest: putchar(j.ord) ed.line.position += 1 ed.back(rest.len) else: putchar(c.cint) ed.line.text &= c.chr ed.line.position += 1 # Character sets const CTRL* = {0 .. 31} DIGIT* = {48 .. 57} LETTER* = {65 .. 122} UPPERLETTER* = {65 .. 90} LOWERLETTER* = {97 .. 122} PRINTABLE* = {32 .. 126} when defined(windows): const ESCAPES* = {0, 22, 224} else: const ESCAPES* = {27} let TERMSETTINGS* = termSave() # Key Mappings var KEYMAP*: CritBitTree[KeyCallBack] KEYMAP["backspace"] = proc(ed: var LineEditor) = ed.deletePrevious() KEYMAP["delete"] = proc(ed: var LineEditor) = ed.deleteNext() KEYMAP["insert"] = proc(ed: var LineEditor) = if ed.mode == mdInsert: ed.mode = mdReplace else: ed.mode = mdInsert KEYMAP["down"] = proc(ed: var LineEditor) = discard #TODO KEYMAP["up"] = proc(ed: var LineEditor) = discard #TODO KEYMAP["left"] = proc(ed: var LineEditor) = ed.back() KEYMAP["right"] = proc(ed: var LineEditor) = ed.forward() KEYMAP["ctrl+c"] = proc(ed: var LineEditor) = termRestore(TERMSETTINGS) quit(0) # Key Names var KEYNAMES*: array[0..31, string] KEYNAMES[3] = "ctrl+c" # Key Sequences var KEYSEQS*: CritBitTree[KeySeq] when defined(windows): KEYSEQS["up"] = @[224, 72] KEYSEQS["down"] = @[224, 80] KEYSEQS["right"] = @[224, 77] KEYSEQS["left"] = @[224, 75] KEYSEQS["insert"] = @[224, 82] KEYSEQS["delete"] = @[224, 83] else: KEYSEQS["up"] = @[27, 91, 65] KEYSEQS["down"] = @[27, 91, 66] KEYSEQS["right"] = @[27, 91, 67] KEYSEQS["left"] = @[27, 91, 68] KEYSEQS["insert"] = @[27, 91, 50, 126] KEYSEQS["delete"] = @[27, 91, 51, 126] proc readLine*(ed: var LineEditor, prompt=""): string = termSetup() stdout.write(prompt) ed.line = Line(text: "", position: 0) while true: let c1 = getchar() if c1 in {10, 13}: termRestore(TERMSETTINGS) return ed.line.text elif c1 in {8, 127}: KEYMAP["backspace"](ed) elif c1 in PRINTABLE: ed.printChar(c1) elif c1 in ESCAPES: var s = newSeq[Key](0) s.add(c1) let c2 = getchar() s.add(c2) if s == KEYSEQS["left"]: KEYMAP["left"](ed) elif s == KEYSEQS["right"]: KEYMAP["right"](ed) elif s == KEYSEQS["up"]: KEYMAP["up"](ed) elif s == KEYSEQS["down"]: KEYMAP["down"](ed) elif s == KEYSEQS["delete"]: KEYMAP["delete"](ed) elif s == KEYSEQS["insert"]: KEYMAP["insert"](ed) elif c2 == 91: let c3 = getchar() s.add(c3) if s == KEYSEQS["right"]: KEYMAP["right"](ed) elif s == KEYSEQS["left"]: KEYMAP["left"](ed) elif c3 in {50, 51}: let c4 = getchar() s.add(c4) if c4 == 126 and c3 == 50: KEYMAP["insert"](ed) elif c4 == 126 and c3 == 51: KEYMAP["delete"](ed) elif KEYMAP.hasKey(KEYNAMES[c1]): KEYMAP[KEYNAMES[c1]](ed) when isMainModule: var ed = LineEditor(mode: mdInsert, history: newSeq[string](0)) echo "\n---", ed.readLine("-> "), "---" |