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// Inspiration for this code comes from Salvatore Sanfilippo's linenoise.
// http://github.com/antirez/linenoise
// Reference:
// * http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
// * http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
var kHistorySize = 30;
var kBufSize = 10 * 1024;
var util = require('util');
var inherits = require('util').inherits;
var EventEmitter = require('events').EventEmitter;
var tty = require('tty');
exports.createInterface = function(output, completer) {
return new Interface(output, completer);
};
function writeFilter(stream) {
if (stream._writeFiltered) return;
stream._writeFiltered = true;
stream._normalWrite = stream.write;
stream.write = function(d) {
var args = Array.prototype.slice.call(arguments);
if (typeof d == 'string') {
args[0] = d.replace(/([^\r])\n|^\n/g, '$1\r\n');
}
// TODO what about buffers?
return stream._normalWrite.apply(stream, args);
}
}
function Interface(output, completer) {
if (!(this instanceof Interface)) return new Interface(output, completer);
EventEmitter.call(this);
this.output = output;
this.completer = completer;
this.setPrompt('> ');
this.enabled = tty.isatty(output.fd);
if (parseInt(process.env['NODE_NO_READLINE'], 10)) {
this.enabled = false;
}
if (this.enabled) {
// input refers to stdin
writeFilter(this.output);
writeFilter(process.stdout);
// Current line
this.line = '';
// Check process.env.TERM ?
tty.setRawMode(true);
this.enabled = true;
// Cursor position on the line.
this.cursor = 0;
this.history = [];
this.historyIndex = -1;
exports.columns = tty.getColumns();
if (process.listeners('SIGWINCH').length === 0) {
process.on('SIGWINCH', function() {
exports.columns = tty.getColumns();
});
}
}
}
inherits(Interface, EventEmitter);
Interface.prototype.__defineGetter__('columns', function() {
return exports.columns;
});
Interface.prototype.setPrompt = function(prompt, length) {
this._prompt = prompt;
this._promptLength = length ? length : Buffer.byteLength(prompt);
};
Interface.prototype.prompt = function() {
if (this.enabled) {
this.cursor = 0;
this._refreshLine();
} else {
this.output.write(this._prompt);
}
};
Interface.prototype._addHistory = function() {
if (this.line.length === 0) return '';
this.history.unshift(this.line);
this.line = '';
this.historyIndex = -1;
this.cursor = 0;
// Only store so many
if (this.history.length > kHistorySize) this.history.pop();
return this.history[0];
};
Interface.prototype._refreshLine = function() {
if (this._closed) return;
// Cursor to left edge.
this.output.write('\x1b[0G');
// Write the prompt and the current buffer content.
this.output.write(this._prompt);
this.output.write(this.line);
// Erase to right.
this.output.write('\x1b[0K');
// Move cursor to original position.
this.output.write('\x1b[0G\x1b[' + (this._promptLength + this.cursor) + 'C');
};
Interface.prototype.close = function(d) {
if (this.enabled) {
tty.setRawMode(false);
}
this.emit('close');
this._closed = true;
};
Interface.prototype.write = function(d) {
if (this._closed) return;
return this.enabled ? this._ttyWrite(d) : this._normalWrite(d);
};
Interface.prototype._normalWrite = function(b) {
// Very simple implementation right now. Should try to break on
// new lines.
this.emit('line', b.toString());
};
Interface.prototype._insertString = function(c) {
//BUG: Problem when adding tabs with following content.
// Perhaps the bug is in _refreshLine(). Not sure.
// A hack would be to insert spaces instead of literal '\t'.
if (this.cursor < this.line.length) {
var beg = this.line.slice(0, this.cursor);
var end = this.line.slice(this.cursor, this.line.length);
this.line = beg + c + end;
this.cursor += c.length;
this._refreshLine();
} else {
this.line += c;
this.cursor += c.length;
this.output.write(c);
}
};
Interface.prototype._tabComplete = function() {
var self = this;
var rv = this.completer(self.line.slice(0, self.cursor));
var completions = rv[0],
completeOn = rv[1]; // the text that was completed
if (completions && completions.length) {
// Apply/show completions.
if (completions.length === 1) {
self._insertString(completions[0].slice(completeOn.length));
self._refreshLine();
} else {
self.output.write('\r\n');
var width = completions.reduce(function(a, b) {
return a.length > b.length ? a : b;
}).length + 2; // 2 space padding
var maxColumns = Math.floor(this.columns / width) || 1;
function handleGroup(group) {
if (group.length == 0) {
return;
}
var minRows = Math.ceil(group.length / maxColumns);
for (var row = 0; row < minRows; row++) {
for (var col = 0; col < maxColumns; col++) {
var idx = row * maxColumns + col;
if (idx >= group.length) {
break;
}
var item = group[idx];
self.output.write(item);
if (col < maxColumns - 1) {
for (var s = 0, itemLen = item.length; s < width - itemLen; s++) {
self.output.write(' ');
}
}
}
self.output.write('\r\n');
}
self.output.write('\r\n');
}
var group = [], c;
for (var i = 0, compLen = completions.length; i < compLen; i++) {
c = completions[i];
if (c === '') {
handleGroup(group);
group = [];
} else {
group.push(c);
}
}
handleGroup(group);
// If there is a common prefix to all matches, then apply that
// portion.
var f = completions.filter(function(e) { if (e) return e; });
var prefix = commonPrefix(f);
if (prefix.length > completeOn.length) {
self._insertString(prefix.slice(completeOn.length));
}
self._refreshLine();
}
}
};
function commonPrefix(strings) {
if (!strings || strings.length == 0) {
return '';
}
var sorted = strings.slice().sort();
var min = sorted[0];
var max = sorted[sorted.length - 1];
for (var i = 0, len = min.length; i < len; i++) {
if (min[i] != max[i]) {
return min.slice(0, i);
}
}
return min;
}
Interface.prototype._historyNext = function() {
if (this.historyIndex > 0) {
this.historyIndex--;
this.line = this.history[this.historyIndex];
this.cursor = this.line.length; // set cursor to end of line.
this._refreshLine();
} else if (this.historyIndex === 0) {
this.historyIndex = -1;
this.cursor = 0;
this.line = '';
this._refreshLine();
}
};
Interface.prototype._historyPrev = function() {
if (this.historyIndex + 1 < this.history.length) {
this.historyIndex++;
this.line = this.history[this.historyIndex];
this.cursor = this.line.length; // set cursor to end of line.
this._refreshLine();
}
};
// handle a write from the tty
Interface.prototype._ttyWrite = function(b) {
switch (b[0]) {
/* ctrl+c */
case 3:
//process.kill(process.pid, "SIGINT");
if (this.listeners('SIGINT').length) {
this.emit('SIGINT');
} else {
// default behavior, end the readline
this.close();
}
break;
case 4: // control-d, delete right or EOF
if (this.cursor === 0 && this.line.length === 0) {
this.close();
} else if (this.cursor < this.line.length) {
this.line = this.line.slice(0, this.cursor) +
this.line.slice(this.cursor + 1, this.line.length);
this._refreshLine();
}
break;
case 13: /* enter */
var line = this._addHistory();
this.output.write('\r\n');
this.emit('line', line);
break;
case 127: /* backspace */
case 8: /* ctrl+h */
if (this.cursor > 0 && this.line.length > 0) {
this.line = this.line.slice(0, this.cursor - 1) +
this.line.slice(this.cursor, this.line.length);
this.cursor--;
this._refreshLine();
}
break;
case 21: /* Ctrl+u, delete the whole line. */
this.cursor = 0;
this.line = '';
this._refreshLine();
break;
case 11: /* Ctrl+k, delete from current to end of line. */
this.line = this.line.slice(0, this.cursor);
this._refreshLine();
break;
case 1: /* Ctrl+a, go to the start of the line */
this.cursor = 0;
this._refreshLine();
break;
case 5: /* ctrl+e, go to the end of the line */
this.cursor = this.line.length;
this._refreshLine();
break;
case 2: // control-b, back one character
if (this.cursor > 0) {
this.cursor--;
this._refreshLine();
}
break;
case 6: // control-f, forward one character
if (this.cursor != this.line.length) {
this.cursor++;
this._refreshLine();
}
break;
case 14: // control-n, next history item
this._historyNext();
break;
case 23: // control-w, delete backwards to a word boundary
if (this.cursor !== 0) {
var leading = this.line.slice(0, this.cursor);
var match = leading.match(/\s?((\W+|\w+)\s*)$/);
leading = leading.slice(0, leading.length - match[1].length);
this.line = leading + this.line.slice(this.cursor, this.line.length);
this.cursor = leading.length;
this._refreshLine();
}
break;
case 9: // tab, completion
if (this.completer) {
this._tabComplete();
}
break;
case 16: // control-p, previous history item
this._historyPrev();
break;
case 26: /* ctrl+z */
process.kill(process.pid, 'SIGTSTP');
return;
case 27: /* escape sequence */
var next_word, next_non_word, previous_word, previous_non_word;
if (b[1] === 98 && this.cursor > 0) {
// meta-b - backward word
previous_word = this.line.slice(0, this.cursor)
.split('').reverse().join('')
.search(/\w/);
if (previous_word !== -1) {
previous_non_word = this.line.slice(0, this.cursor - previous_word)
.split('').reverse().join('')
.search(/\W/);
if (previous_non_word !== -1) {
this.cursor -= previous_word + previous_non_word;
this._refreshLine();
break;
}
}
this.cursor = 0;
this._refreshLine();
} else if (b[1] === 102 && this.cursor < this.line.length) {
// meta-f - forward word
next_word = this.line.slice(this.cursor, this.line.length).search(/\w/);
if (next_word !== -1) {
next_non_word = this.line.slice(this.cursor + next_word,
this.line.length).search(/\W/);
if (next_non_word !== -1) {
this.cursor += next_word + next_non_word;
this._refreshLine();
break;
}
}
this.cursor = this.line.length;
this._refreshLine();
} else if (b[1] === 100 && this.cursor < this.line.length) {
// meta-d delete forward word
next_word = this.line.slice(this.cursor, this.line.length).search(/\w/);
if (next_word !== -1) {
next_non_word = this.line.slice(this.cursor + next_word,
this.line.length).search(/\W/);
if (next_non_word !== -1) {
this.line = this.line.slice(this.cursor +
next_word +
next_non_word);
this.cursor = 0;
this._refreshLine();
break;
}
}
this.line = '';
this.cursor = 0;
this._refreshLine();
} else if (b[1] === 91 && b[2] === 68) {
// left arrow
if (this.cursor > 0) {
this.cursor--;
this.output.write('\x1b[0D');
}
} else if (b[1] === 91 && b[2] === 67) {
// right arrow
if (this.cursor != this.line.length) {
this.cursor++;
this.output.write('\x1b[0C');
}
} else if ((b[1] === 91 && b[2] === 72) ||
(b[1] === 79 && b[2] === 72) ||
(b[1] === 91 && b[2] === 55) ||
(b[1] === 91 && b[2] === 49 && (b[3] && b[3] === 126))) {
// home
this.cursor = 0;
this._refreshLine();
} else if ((b[1] === 91 && b[2] === 70) ||
(b[1] === 79 && b[2] === 70) ||
(b[1] === 91 && b[2] === 56) ||
(b[1] === 91 && b[2] === 52 && (b[3] && b[3] === 126))) {
// end
this.cursor = this.line.length;
this._refreshLine();
} else if (b[1] === 91 && b[2] === 65) {
// up arrow
this._historyPrev();
} else if (b[1] === 91 && b[2] === 66) {
// down arrow
this._historyNext();
} else if (b[1] === 91 && b[2] === 51 && this.cursor < this.line.length) {
// delete right
this.line = this.line.slice(0, this.cursor) +
this.line.slice(this.cursor + 1, this.line.length);
this._refreshLine();
}
break;
default:
var c = b.toString('utf8');
var lines = c.split(/\r\n|\n|\r/);
for (var i = 0, len = lines.length; i < len; i++) {
if (i > 0) {
this._ttyWrite(new Buffer([13]));
}
this._insertString(lines[i]);
}
break;
}
};
exports.Interface = Interface;