core/linedit.nim
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import critbits, terminal, queues, sequtils, strutils, os # 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] let TERMSETTINGS* = termSave() proc termRestore*() = discard execCmd "stty </dev/tty " & TERMSETTINGS proc getchar(): cint = return stdin.readChar().ord.cint proc putchar(c: cint) = stdout.write(c.chr) # Types type Key* = int KeySeq* = seq[Key] KeyCallback* = proc(ed: var LineEditor) LineError* = ref Exception LineEditorMode = enum mdInsert mdReplace Line = object text: string position: int LineHistory = object file: string tainted: bool position: int queue: Queue[string] max: int LineEditor* = object history: LineHistory line: Line mode: LineEditorMode # Internal Methods 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 fromStart(line: Line): string = if line.empty: return "" return line.text[line.first..line.position-1] proc toEnd(line: Line): string = if line.empty: return "" 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 `[]`( q: Queue[string], pos: int): string = var c = 0 for e in q.items: if c == pos: result = e break c.inc proc `[]=`( q: var Queue[string], pos: int, s: string) = var c = 0 for e in q.mitems: if c == pos: e = s break c.inc proc add(h: var LineHistory, s: string, force=false) = if s == "" and not force: return if h.queue.len >= h.max: discard h.queue.dequeue if h.tainted: h.queue[h.queue.len-1] = s else: h.queue.enqueue s proc previous(h: var LineHistory): string = if h.queue.len == 0 or h.position <= 0: return nil h.position.dec result = h.queue[h.position] proc next(h: var LineHistory): string = if h.queue.len == 0 or h.position >= h.queue.len-1: return nil h.position.inc result = h.queue[h.position] # Public API proc deletePrevious*(ed: var LineEditor) = if not ed.line.empty: if ed.line.full: stdout.cursorBackward putchar(32) stdout.cursorBackward ed.line.position.dec ed.line.text = ed.line.text[0..ed.line.last-1] else: let rest = ed.line.toEnd & " " ed.back for i in rest: putchar i.ord ed.line.text = ed.line.fromStart & 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.toEnd[1..^1] & " " for c in rest: putchar c.ord stdout.cursorBackward(rest.len) ed.line.text = ed.line.fromStart & ed.line.toEnd[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.toEnd 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[ed.line.position] = c.chr ed.line.position += 1 proc changeLine*(ed: var LineEditor, s: string) = let text = ed.line.text let diff = text.len - s.len let position = ed.line.position if position > 0: stdout.cursorBackward(position) for c in s: putchar(c.ord) ed.line.position = s.len ed.line.text = s if diff > 0: for i in 0.countup(diff-1): putchar(32) stdout.cursorBackward(diff) proc addToLineAtPosition(ed: var LineEditor, s: string) = let fromStart = ed.line.fromStart let toEnd = ed.line.toEnd let diff = toEnd.len - s.len for c in s: ed.printChar(c.ord) #ed.printChar(32) proc clearLine*(ed: var LineEditor) = stdout.cursorBackward(ed.line.position+1) for i in ed.line.text: putchar(32) putchar(32) stdout.cursorBackward(ed.line.text.len) ed.line.position = 0 ed.line.text = "" proc goToStart*(ed: var LineEditor) = stdout.cursorBackward(ed.line.position) ed.line.position = 0 proc goToEnd*(ed: var LineEditor) = stdout.cursorForward(ed.line.text.len) ed.line.position = ed.line.text.len proc historyInit*(size = 256, historyFile: string = nil): LineHistory = result.file = historyFile result.queue = initQueue[string](size) result.position = 0 result.tainted = false result.max = size if historyFile.isNil: return if result.file.fileExists: var line: string let lines = result.file.readFile.split("\n") for line in lines: if line != "": result.add line result.position = lines.len else: result.file.writeFile("") proc historyAdd*(ed: var LineEditor, force = false) = ed.history.add ed.line.text, force if ed.history.file.isNil: return ed.history.file.writeFile(toSeq(ed.history.queue.items).join("\n")) proc historyPrevious*(ed: var LineEditor) = let s = ed.history.previous if s.isNil: return let pos = ed.history.position var current: int if ed.history.tainted: current = ed.history.queue.len-2 else: current = ed.history.queue.len-1 if pos == current and ed.history.queue[current] != ed.line.text: ed.historyAdd(force = true) ed.history.tainted = true ed.changeLine(s) proc historyNext*(ed: var LineEditor) = let s = ed.history.next if s.isNil: return ed.changeLine(s) proc historyFlush*(ed: var LineEditor) = if ed.history.queue.len > 0: ed.history.position = ed.history.queue.len ed.history.tainted = false var completionCallback* = proc (ed: LineEditor): seq[string] {.closure.}= return @[] proc completeLine*(ed: var LineEditor): int = let compl = completionCallback(ed) let position = ed.line.position let words = ed.line.fromStart.split(" ") var word: string if words.len > 0: word = words[words.len-1] else: word = ed.line.fromStart var rawmatches = compl.filterIt(it.startsWith word) var matches: seq[string] if ed.line.fromStart.len > 0: matches = newSeq[string](0) for s in rawmatches: var s1 = s s1.delete(0, word.len-1) matches.add s1 else: matches = rawmatches var n = 0 if matches.len > 0: ed.addToLineAtPosition(matches[0]) else: return -1 var ch = getchar() while ch == 9: n.inc if n < matches.len: let diff = ed.line.position - position for i in 0.countup(diff-1): ed.deletePrevious ed.line.position = position ed.addToLineAtPosition(matches[n]) ch = getchar() else: n = -1 return ch proc lineText*(ed: LineEditor): string = return ed.line.text proc initEditor*(mode = mdInsert, historySize = 256, historyFile: string = nil): LineEditor = termSetup() result.mode = mode result.history = historyInit(historySize, historyFile) # 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} # 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) = ed.historyNext() KEYMAP["up"] = proc(ed: var LineEditor) = ed.historyPrevious() KEYMAP["left"] = proc(ed: var LineEditor) = ed.back() KEYMAP["right"] = proc(ed: var LineEditor) = ed.forward() KEYMAP["ctrl+c"] = proc(ed: var LineEditor) = termRestore() quit(0) KEYMAP["ctrl+x"] = proc(ed: var LineEditor) = ed.clearLine() KEYMAP["ctrl+b"] = proc(ed: var LineEditor) = ed.goToStart() KEYMAP["ctrl+e"] = proc(ed: var LineEditor) = ed.goToEnd() # Key Names var KEYNAMES*: array[0..31, string] KEYNAMES[1] = "ctrl+a" KEYNAMES[2] = "ctrl+b" KEYNAMES[3] = "ctrl+c" KEYNAMES[4] = "ctrl+d" KEYNAMES[5] = "ctrl+e" KEYNAMES[6] = "ctrl+f" KEYNAMES[7] = "ctrl+g" KEYNAMES[8] = "ctrl+h" KEYNAMES[9] = "ctrl+i" KEYNAMES[9] = "tab" KEYNAMES[10] = "ctrl+j" KEYNAMES[11] = "ctrl+k" KEYNAMES[12] = "ctrl+l" KEYNAMES[13] = "ctrl+m" KEYNAMES[14] = "ctrl+n" KEYNAMES[15] = "ctrl+o" KEYNAMES[16] = "ctrl+p" KEYNAMES[17] = "ctrl+q" KEYNAMES[18] = "ctrl+r" KEYNAMES[19] = "ctrl+s" KEYNAMES[20] = "ctrl+t" KEYNAMES[21] = "ctrl+u" KEYNAMES[22] = "ctrl+v" KEYNAMES[23] = "ctrl+w" KEYNAMES[24] = "ctrl+x" KEYNAMES[25] = "ctrl+y" KEYNAMES[26] = "ctrl+z" # 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="", hidechars = false): string = stdout.write(prompt) ed.line = Line(text: "", position: 0) var c = -1 # Used to manage completions while true: var c1: int if c > 0: c1 = c c = -1 else: c1 = getchar() if c1 in {10, 13}: stdout.write("\n") ed.historyAdd() ed.historyFlush() return ed.line.text elif c1 in {8, 127}: KEYMAP["backspace"](ed) elif c1 in PRINTABLE: if hidechars: putchar('*'.ord) ed.line.text &= c1.chr ed.line.position.inc else: ed.printChar(c1) elif c1 == 9: # TAB c = ed.completeLine() 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 s == KEYSEQS["up"]: KEYMAP["up"](ed) elif s == KEYSEQS["down"]: KEYMAP["down"](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) proc password*(ed: var LineEditor, prompt=""): string = return ed.readLine(prompt, true) when isMainModule: proc testChar() = while true: let a = getch().ord echo "\n->", a if a == 3: termRestore() quit(0) proc testLineEditor() = while true: var ed = initEditor(historyFile = nil) echo "---", ed.readLine("-> "), "---" testChar() |