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keypress
========
### Make any Node ReadableStream emit "keypress" events
Previous to Node `v0.8.x`, there was an undocumented `"keypress"` event that
`process.stdin` would emit when it was a TTY. Some people discovered this hidden
gem, and started using it in their own code.
Now in Node `v0.8.x`, this `"keypress"` event does not get emitted by default,
but rather only when it is being used in conjuction with the `readline` (or by
extension, the `repl`) module.
This module is the exact logic from the node `v0.8.x` releases ripped out into its
own module.
__Bonus:__ Now with mouse support!
Installation
------------
Install with `npm`:
``` bash
$ npm install keypress
```
Or add it to the `"dependencies"` section of your _package.json_ file.
Example
-------
#### Listening for "keypress" events
``` js
var keypress = require('keypress');
// make `process.stdin` begin emitting "keypress" events
keypress(process.stdin);
// listen for the "keypress" event
process.stdin.on('keypress', function (ch, key) {
console.log('got "keypress"', key);
if (key && key.ctrl && key.name == 'c') {
process.stdin.pause();
}
});
process.stdin.setRawMode(true);
process.stdin.resume();
```
#### Listening for "mousepress" events
``` js
var keypress = require('keypress');
// make `process.stdin` begin emitting "mousepress" (and "keypress") events
keypress(process.stdin);
// you must enable the mouse events before they will begin firing
keypress.enableMouse(process.stdout);
process.stdin.on('mousepress', function (info) {
console.log('got "mousepress" event at %d x %d', info.x, info.y);
});
process.on('exit', function () {
// disable mouse on exit, so that the state
// is back to normal for the terminal
keypress.disableMouse(process.stdout);
});
```
License
-------
(The MIT License)
Copyright (c) 2012 Nathan Rajlich <nathan@tootallnate.net>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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/**
* Module dependencies.
*/
var EventEmitter = require('events').EventEmitter;
/**
* Module exports.
*/
var exports = module.exports = keypress;
/**
* This module offers the internal "keypress" functionality from node-core's
* `readline` module, for your own programs and modules to use.
*
* The `keypress` function accepts a readable Stream instance and makes it
* emit "keypress" events.
*
* Usage:
*
* ``` js
* require('keypress')(process.stdin);
*
* process.stdin.on('keypress', function (ch, key) {
* console.log(ch, key);
* if (key.ctrl && key.name == 'c') {
* process.stdin.pause();
* }
* });
* proces.stdin.resume();
* ```
*
* @param {Stream} stream
* @api public
*/
function keypress(stream) {
if (isEmittingKeypress(stream)) return;
var StringDecoder = require('string_decoder').StringDecoder; // lazy load
stream._keypressDecoder = new StringDecoder('utf8');
function onData(b) {
if (listenerCount(stream, 'keypress') > 0) {
var r = stream._keypressDecoder.write(b);
if (r) emitKey(stream, r);
} else {
// Nobody's watching anyway
stream.removeListener('data', onData);
stream.on('newListener', onNewListener);
}
}
function onNewListener(event) {
if (event == 'keypress') {
stream.on('data', onData);
stream.removeListener('newListener', onNewListener);
}
}
if (listenerCount(stream, 'keypress') > 0) {
stream.on('data', onData);
} else {
stream.on('newListener', onNewListener);
}
}
/**
* Returns `true` if the stream is already emitting "keypress" events.
* `false` otherwise.
*
* @param {Stream} stream readable stream
* @return {Boolean} `true` if the stream is emitting "keypress" events
* @api private
*/
function isEmittingKeypress(stream) {
var rtn = !!stream._keypressDecoder;
if (!rtn) {
// XXX: for older versions of node (v0.6.x, v0.8.x) we want to remove the
// existing "data" and "newListener" keypress events since they won't include
// this `keypress` module extensions (like "mousepress" events).
stream.listeners('data').slice(0).forEach(function(l) {
if (l.name == 'onData' && /emitKey/.test(l.toString())) {
stream.removeListener('data', l);
}
});
stream.listeners('newListener').slice(0).forEach(function(l) {
if (l.name == 'onNewListener' && /keypress/.test(l.toString())) {
stream.removeListener('newListener', l);
}
});
}
return rtn;
}
/**
* Enables "mousepress" events on the *input* stream. Note that `stream` must be
* an *output* stream (i.e. a Writable Stream instance), usually `process.stdout`.
*
* @param {Stream} stream writable stream instance
* @api public
*/
exports.enableMouse = function (stream) {
stream.write('\x1b[?1000h');
};
/**
* Disables "mousepress" events from being sent to the *input* stream.
* Note that `stream` must be an *output* stream (i.e. a Writable Stream instance),
* usually `process.stdout`.
*
* @param {Stream} stream writable stream instance
* @api public
*/
exports.disableMouse = function (stream) {
stream.write('\x1b[?1000l');
};
/**
* `EventEmitter.listenerCount()` polyfill, for backwards compat.
*
* @param {Emitter} emitter event emitter instance
* @param {String} event event name
* @return {Number} number of listeners for `event`
* @api public
*/
var listenerCount = EventEmitter.listenerCount;
if (!listenerCount) {
listenerCount = function(emitter, event) {
return emitter.listeners(event).length;
};
}
///////////////////////////////////////////////////////////////////////
// Below this function is code from node-core's `readline.js` module //
///////////////////////////////////////////////////////////////////////
/*
Some patterns seen in terminal key escape codes, derived from combos seen
at http://www.midnight-commander.org/browser/lib/tty/key.c
ESC letter
ESC [ letter
ESC [ modifier letter
ESC [ 1 ; modifier letter
ESC [ num char
ESC [ num ; modifier char
ESC O letter
ESC O modifier letter
ESC O 1 ; modifier letter
ESC N letter
ESC [ [ num ; modifier char
ESC [ [ 1 ; modifier letter
ESC ESC [ num char
ESC ESC O letter
- char is usually ~ but $ and ^ also happen with rxvt
- modifier is 1 +
(shift * 1) +
(left_alt * 2) +
(ctrl * 4) +
(right_alt * 8)
- two leading ESCs apparently mean the same as one leading ESC
*/
// Regexes used for ansi escape code splitting
var metaKeyCodeRe = /^(?:\x1b)([a-zA-Z0-9])$/;
var functionKeyCodeRe =
/^(?:\x1b+)(O|N|\[|\[\[)(?:(\d+)(?:;(\d+))?([~^$])|(?:1;)?(\d+)?([a-zA-Z]))/;
function emitKey(stream, s) {
var ch,
key = {
name: undefined,
ctrl: false,
meta: false,
shift: false
},
parts;
if (Buffer.isBuffer(s)) {
if (s[0] > 127 && s[1] === undefined) {
s[0] -= 128;
s = '\x1b' + s.toString(stream.encoding || 'utf-8');
} else {
s = s.toString(stream.encoding || 'utf-8');
}
}
key.sequence = s;
if (s === '\r') {
// carriage return
key.name = 'return';
} else if (s === '\n') {
// enter, should have been called linefeed
key.name = 'enter';
} else if (s === '\t') {
// tab
key.name = 'tab';
} else if (s === '\b' || s === '\x7f' ||
s === '\x1b\x7f' || s === '\x1b\b') {
// backspace or ctrl+h
key.name = 'backspace';
key.meta = (s.charAt(0) === '\x1b');
} else if (s === '\x1b' || s === '\x1b\x1b') {
// escape key
key.name = 'escape';
key.meta = (s.length === 2);
} else if (s === ' ' || s === '\x1b ') {
key.name = 'space';
key.meta = (s.length === 2);
} else if (s <= '\x1a') {
// ctrl+letter
key.name = String.fromCharCode(s.charCodeAt(0) + 'a'.charCodeAt(0) - 1);
key.ctrl = true;
} else if (s.length === 1 && s >= 'a' && s <= 'z') {
// lowercase letter
key.name = s;
} else if (s.length === 1 && s >= 'A' && s <= 'Z') {
// shift+letter
key.name = s.toLowerCase();
key.shift = true;
} else if (parts = metaKeyCodeRe.exec(s)) {
// meta+character key
key.name = parts[1].toLowerCase();
key.meta = true;
key.shift = /^[A-Z]$/.test(parts[1]);
} else if (parts = functionKeyCodeRe.exec(s)) {
// ansi escape sequence
// reassemble the key code leaving out leading \x1b's,
// the modifier key bitflag and any meaningless "1;" sequence
var code = (parts[1] || '') + (parts[2] || '') +
(parts[4] || '') + (parts[6] || ''),
modifier = (parts[3] || parts[5] || 1) - 1;
// Parse the key modifier
key.ctrl = !!(modifier & 4);
key.meta = !!(modifier & 10);
key.shift = !!(modifier & 1);
key.code = code;
// Parse the key itself
switch (code) {
/* xterm/gnome ESC O letter */
case 'OP': key.name = 'f1'; break;
case 'OQ': key.name = 'f2'; break;
case 'OR': key.name = 'f3'; break;
case 'OS': key.name = 'f4'; break;
/* xterm/rxvt ESC [ number ~ */
case '[11~': key.name = 'f1'; break;
case '[12~': key.name = 'f2'; break;
case '[13~': key.name = 'f3'; break;
case '[14~': key.name = 'f4'; break;
/* from Cygwin and used in libuv */
case '[[A': key.name = 'f1'; break;
case '[[B': key.name = 'f2'; break;
case '[[C': key.name = 'f3'; break;
case '[[D': key.name = 'f4'; break;
case '[[E': key.name = 'f5'; break;
/* common */
case '[15~': key.name = 'f5'; break;
case '[17~': key.name = 'f6'; break;
case '[18~': key.name = 'f7'; break;
case '[19~': key.name = 'f8'; break;
case '[20~': key.name = 'f9'; break;
case '[21~': key.name = 'f10'; break;
case '[23~': key.name = 'f11'; break;
case '[24~': key.name = 'f12'; break;
/* xterm ESC [ letter */
case '[A': key.name = 'up'; break;
case '[B': key.name = 'down'; break;
case '[C': key.name = 'right'; break;
case '[D': key.name = 'left'; break;
case '[E': key.name = 'clear'; break;
case '[F': key.name = 'end'; break;
case '[H': key.name = 'home'; break;
/* xterm/gnome ESC O letter */
case 'OA': key.name = 'up'; break;
case 'OB': key.name = 'down'; break;
case 'OC': key.name = 'right'; break;
case 'OD': key.name = 'left'; break;
case 'OE': key.name = 'clear'; break;
case 'OF': key.name = 'end'; break;
case 'OH': key.name = 'home'; break;
/* xterm/rxvt ESC [ number ~ */
case '[1~': key.name = 'home'; break;
case '[2~': key.name = 'insert'; break;
case '[3~': key.name = 'delete'; break;
case '[4~': key.name = 'end'; break;
case '[5~': key.name = 'pageup'; break;
case '[6~': key.name = 'pagedown'; break;
/* putty */
case '[[5~': key.name = 'pageup'; break;
case '[[6~': key.name = 'pagedown'; break;
/* rxvt */
case '[7~': key.name = 'home'; break;
case '[8~': key.name = 'end'; break;
/* rxvt keys with modifiers */
case '[a': key.name = 'up'; key.shift = true; break;
case '[b': key.name = 'down'; key.shift = true; break;
case '[c': key.name = 'right'; key.shift = true; break;
case '[d': key.name = 'left'; key.shift = true; break;
case '[e': key.name = 'clear'; key.shift = true; break;
case '[2$': key.name = 'insert'; key.shift = true; break;
case '[3$': key.name = 'delete'; key.shift = true; break;
case '[5$': key.name = 'pageup'; key.shift = true; break;
case '[6$': key.name = 'pagedown'; key.shift = true; break;
case '[7$': key.name = 'home'; key.shift = true; break;
case '[8$': key.name = 'end'; key.shift = true; break;
case 'Oa': key.name = 'up'; key.ctrl = true; break;
case 'Ob': key.name = 'down'; key.ctrl = true; break;
case 'Oc': key.name = 'right'; key.ctrl = true; break;
case 'Od': key.name = 'left'; key.ctrl = true; break;
case 'Oe': key.name = 'clear'; key.ctrl = true; break;
case '[2^': key.name = 'insert'; key.ctrl = true; break;
case '[3^': key.name = 'delete'; key.ctrl = true; break;
case '[5^': key.name = 'pageup'; key.ctrl = true; break;
case '[6^': key.name = 'pagedown'; key.ctrl = true; break;
case '[7^': key.name = 'home'; key.ctrl = true; break;
case '[8^': key.name = 'end'; key.ctrl = true; break;
/* misc. */
case '[Z': key.name = 'tab'; key.shift = true; break;
default: key.name = 'undefined'; break;
}
} else if (s.length > 1 && s[0] !== '\x1b') {
// Got a longer-than-one string of characters.
// Probably a paste, since it wasn't a control sequence.
Array.prototype.forEach.call(s, function(c) {
emitKey(stream, c);
});
return;
}
// XXX: this "mouse" parsing code is NOT part of the node-core standard
// `readline.js` module, and is a `keypress` module non-standard extension.
if (key.code == '[M') {
key.name = 'mouse';
var s = key.sequence;
var b = s.charCodeAt(3);
key.x = s.charCodeAt(4) - 040;
key.y = s.charCodeAt(5) - 040;
key.scroll = 0;
key.ctrl = !!(1<<4 & b);
key.meta = !!(1<<3 & b);
key.shift = !!(1<<2 & b);
key.release = (3 & b) === 3;
if (1<<6 & b) { //scroll
key.scroll = 1 & b ? 1 : -1;
}
if (!key.release && !key.scroll) {
key.button = b & 3;
}
}
// Don't emit a key if no name was found
if (key.name === undefined) {
key = undefined;
}
if (s.length === 1) {
ch = s;
}
if (key && key.name == 'mouse') {
stream.emit('mousepress', key);
} else if (key || ch) {
stream.emit('keypress', ch, key);
}
}

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{
"name": "keypress",
"version": "0.2.1",
"description": "Make any Node ReadableStream emit \"keypress\" events",
"author": "Nathan Rajlich <nathan@tootallnate.net> (http://tootallnate.net)",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"repository": {
"type": "git",
"url": "git://github.com/TooTallNate/keypress.git"
},
"keywords": [
"keypress",
"readline",
"core"
],
"license": "MIT"
}

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var keypress = require('./')
keypress(process.stdin)
if (process.stdin.setRawMode)
process.stdin.setRawMode(true)
else
require('tty').setRawMode(true)
process.stdin.on('keypress', function (c, key) {
console.log(0, c, key)
if (key && key.ctrl && key.name == 'c') {
process.stdin.pause()
}
})
process.stdin.on('mousepress', function (mouse) {
console.log(mouse)
})
keypress.enableMouse(process.stdout)
process.on('exit', function () {
//disable mouse on exit, so that the state is back to normal
//for the terminal.
keypress.disableMouse(process.stdout)
})
process.stdin.resume()