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var binding = process.binding('stdio'),
Stream = require('stream').Stream,
inherits = require('util').inherits,
writeTTY = binding.writeTTY,
closeTTY = binding.closeTTY;
function ReadStream(fd) {
if (!(this instanceof ReadStream)) return new ReadStream(fd);
Stream.call(this);
var self = this;
this.fd = fd;
this.paused = true;
this.readable = true;
var dataListeners = this.listeners('data'),
dataUseString = false;
function onError(err) {
self.emit('error', err);
}
function onKeypress(char, key) {
self.emit('keypress', char, key);
if (dataListeners.length && char) {
self.emit('data', dataUseString ? char : new Buffer(char, 'utf-8'));
}
}
function onResize() {
process.emit('SIGWINCH');
}
// A windows console stream is always UTF-16, actually
// So it makes no sense to set the encoding, however someone could call
// setEncoding to tell us he wants strings not buffers
this.setEncoding = function(encoding) {
dataUseString = !!encoding;
}
binding.initTTYWatcher(fd, onError, onKeypress, onResize);
}
inherits(ReadStream, Stream);
exports.ReadStream = ReadStream;
ReadStream.prototype.isTTY = true;
ReadStream.prototype.pause = function() {
if (this.paused)
return;
this.paused = true;
binding.stopTTYWatcher();
};
ReadStream.prototype.resume = function() {
if (!this.readable)
throw new Error('Cannot resume() closed tty.ReadStream.');
if (!this.paused)
return;
this.paused = false;
binding.startTTYWatcher();
};
ReadStream.prototype.destroy = function() {
if (!this.readable)
return;
this.readable = false;
binding.destroyTTYWatcher();
var self = this;
process.nextTick(function() {
try {
closeTTY(self.fd);
self.emit('close');
} catch (err) {
self.emit('error', err);
}
});
};
ReadStream.prototype.destroySoon = ReadStream.prototype.destroy;
function WriteStream(fd) {
if (!(this instanceof WriteStream)) return new WriteStream(fd);
Stream.call(this);
var self = this;
this.fd = fd;
this.writable = true;
}
inherits(WriteStream, Stream);
exports.WriteStream = WriteStream;
WriteStream.prototype.isTTY = true;
WriteStream.prototype.write = function(data, encoding) {
if (!this.writable) {
throw new Error('stream not writable');
}
if (Buffer.isBuffer(data)) {
data = data.toString('utf-8');
}
try {
writeTTY(this.fd, data);
} catch (err) {
this.emit('error', err);
}
return true;
};
WriteStream.prototype.end = function(data, encoding) {
if (data) {
this.write(data, encoding);
}
this.destroy();
};
WriteStream.prototype.destroy = function() {
if (!this.writable)
return;
this.writable = false;
var self = this;
process.nextTick(function() {
var closed = false;
try {
closeTTY(self.fd);
closed = true;
} catch (err) {
self.emit('error', err);
}
if (closed) {
self.emit('close');
}
});
};
WriteStream.prototype.moveCursor = function(dx, dy) {
if (!this.writable)
throw new Error('Stream not writable');
binding.moveCursor(this.fd, dx, dy);
};
WriteStream.prototype.cursorTo = function(x, y) {
if (!this.writable)
throw new Error('Stream not writable');
binding.cursorTo(this.fd, x, y);
};
WriteStream.prototype.clearLine = function(direction) {
if (!this.writable)
throw new Error('Stream not writable');
binding.clearLine(this.fd, direction || 0);
};
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