--- /dev/null
+
+/**
+ * References:
+ *
+ * - http://en.wikipedia.org/wiki/ANSI_escape_code
+ * - http://www.termsys.demon.co.uk/vtansi.htm
+ *
+ */
+
+/**
+ * Module dependencies.
+ */
+
+var emitNewlineEvents = require('./newlines')
+ , prefix = '\x1b[' // For all escape codes
+ , suffix = 'm' // Only for color codes
+
+/**
+ * The ANSI escape sequences.
+ */
+
+var codes = {
+ up: 'A'
+ , down: 'B'
+ , forward: 'C'
+ , back: 'D'
+ , nextLine: 'E'
+ , previousLine: 'F'
+ , horizontalAbsolute: 'G'
+ , eraseData: 'J'
+ , eraseLine: 'K'
+ , scrollUp: 'S'
+ , scrollDown: 'T'
+ , savePosition: 's'
+ , restorePosition: 'u'
+ , queryPosition: '6n'
+ , hide: '?25l'
+ , show: '?25h'
+}
+
+/**
+ * Rendering ANSI codes.
+ */
+
+var styles = {
+ bold: 1
+ , italic: 3
+ , underline: 4
+ , inverse: 7
+}
+
+/**
+ * The negating ANSI code for the rendering modes.
+ */
+
+var reset = {
+ bold: 22
+ , italic: 23
+ , underline: 24
+ , inverse: 27
+}
+
+/**
+ * The standard, styleable ANSI colors.
+ */
+
+var colors = {
+ white: 37
+ , black: 30
+ , blue: 34
+ , cyan: 36
+ , green: 32
+ , magenta: 35
+ , red: 31
+ , yellow: 33
+ , grey: 90
+ , brightBlack: 90
+ , brightRed: 91
+ , brightGreen: 92
+ , brightYellow: 93
+ , brightBlue: 94
+ , brightMagenta: 95
+ , brightCyan: 96
+ , brightWhite: 97
+}
+
+
+/**
+ * Creates a Cursor instance based off the given `writable stream` instance.
+ */
+
+function ansi (stream, options) {
+ if (stream._ansicursor) {
+ return stream._ansicursor
+ } else {
+ return stream._ansicursor = new Cursor(stream, options)
+ }
+}
+module.exports = exports = ansi
+
+/**
+ * The `Cursor` class.
+ */
+
+function Cursor (stream, options) {
+ if (!(this instanceof Cursor)) {
+ return new Cursor(stream, options)
+ }
+ if (typeof stream != 'object' || typeof stream.write != 'function') {
+ throw new Error('a valid Stream instance must be passed in')
+ }
+
+ // the stream to use
+ this.stream = stream
+
+ // when 'enabled' is false then all the functions are no-ops except for write()
+ this.enabled = options && options.enabled
+ if (typeof this.enabled === 'undefined') {
+ this.enabled = stream.isTTY
+ }
+ this.enabled = !!this.enabled
+
+ // then `buffering` is true, then `write()` calls are buffered in
+ // memory until `flush()` is invoked
+ this.buffering = !!(options && options.buffering)
+ this._buffer = []
+
+ // controls the foreground and background colors
+ this.fg = this.foreground = new Colorer(this, 0)
+ this.bg = this.background = new Colorer(this, 10)
+
+ // defaults
+ this.Bold = false
+ this.Italic = false
+ this.Underline = false
+ this.Inverse = false
+
+ // keep track of the number of "newlines" that get encountered
+ this.newlines = 0
+ emitNewlineEvents(stream)
+ stream.on('newline', function () {
+ this.newlines++
+ }.bind(this))
+}
+exports.Cursor = Cursor
+
+/**
+ * Helper function that calls `write()` on the underlying Stream.
+ * Returns `this` instead of the write() return value to keep
+ * the chaining going.
+ */
+
+Cursor.prototype.write = function (data) {
+ if (this.buffering) {
+ this._buffer.push(arguments)
+ } else {
+ this.stream.write.apply(this.stream, arguments)
+ }
+ return this
+}
+
+/**
+ * Buffer `write()` calls into memory.
+ *
+ * @api public
+ */
+
+Cursor.prototype.buffer = function () {
+ this.buffering = true
+ return this
+}
+
+/**
+ * Write out the in-memory buffer.
+ *
+ * @api public
+ */
+
+Cursor.prototype.flush = function () {
+ this.buffering = false
+ var str = this._buffer.map(function (args) {
+ if (args.length != 1) throw new Error('unexpected args length! ' + args.length);
+ return args[0];
+ }).join('');
+ this._buffer.splice(0); // empty
+ this.write(str);
+ return this
+}
+
+
+/**
+ * The `Colorer` class manages both the background and foreground colors.
+ */
+
+function Colorer (cursor, base) {
+ this.current = null
+ this.cursor = cursor
+ this.base = base
+}
+exports.Colorer = Colorer
+
+/**
+ * Write an ANSI color code, ensuring that the same code doesn't get rewritten.
+ */
+
+Colorer.prototype._setColorCode = function setColorCode (code) {
+ var c = String(code)
+ if (this.current === c) return
+ this.cursor.enabled && this.cursor.write(prefix + c + suffix)
+ this.current = c
+ return this
+}
+
+
+/**
+ * Set up the positional ANSI codes.
+ */
+
+Object.keys(codes).forEach(function (name) {
+ var code = String(codes[name])
+ Cursor.prototype[name] = function () {
+ var c = code
+ if (arguments.length > 0) {
+ c = toArray(arguments).map(Math.round).join(';') + code
+ }
+ this.enabled && this.write(prefix + c)
+ return this
+ }
+})
+
+/**
+ * Set up the functions for the rendering ANSI codes.
+ */
+
+Object.keys(styles).forEach(function (style) {
+ var name = style[0].toUpperCase() + style.substring(1)
+ , c = styles[style]
+ , r = reset[style]
+
+ Cursor.prototype[style] = function () {
+ if (this[name]) return this
+ this.enabled && this.write(prefix + c + suffix)
+ this[name] = true
+ return this
+ }
+
+ Cursor.prototype['reset' + name] = function () {
+ if (!this[name]) return this
+ this.enabled && this.write(prefix + r + suffix)
+ this[name] = false
+ return this
+ }
+})
+
+/**
+ * Setup the functions for the standard colors.
+ */
+
+Object.keys(colors).forEach(function (color) {
+ var code = colors[color]
+
+ Colorer.prototype[color] = function () {
+ this._setColorCode(this.base + code)
+ return this.cursor
+ }
+
+ Cursor.prototype[color] = function () {
+ return this.foreground[color]()
+ }
+})
+
+/**
+ * Makes a beep sound!
+ */
+
+Cursor.prototype.beep = function () {
+ this.enabled && this.write('\x07')
+ return this
+}
+
+/**
+ * Moves cursor to specific position
+ */
+
+Cursor.prototype.goto = function (x, y) {
+ x = x | 0
+ y = y | 0
+ this.enabled && this.write(prefix + y + ';' + x + 'H')
+ return this
+}
+
+/**
+ * Resets the color.
+ */
+
+Colorer.prototype.reset = function () {
+ this._setColorCode(this.base + 39)
+ return this.cursor
+}
+
+/**
+ * Resets all ANSI formatting on the stream.
+ */
+
+Cursor.prototype.reset = function () {
+ this.enabled && this.write(prefix + '0' + suffix)
+ this.Bold = false
+ this.Italic = false
+ this.Underline = false
+ this.Inverse = false
+ this.foreground.current = null
+ this.background.current = null
+ return this
+}
+
+/**
+ * Sets the foreground color with the given RGB values.
+ * The closest match out of the 216 colors is picked.
+ */
+
+Colorer.prototype.rgb = function (r, g, b) {
+ var base = this.base + 38
+ , code = rgb(r, g, b)
+ this._setColorCode(base + ';5;' + code)
+ return this.cursor
+}
+
+/**
+ * Same as `cursor.fg.rgb(r, g, b)`.
+ */
+
+Cursor.prototype.rgb = function (r, g, b) {
+ return this.foreground.rgb(r, g, b)
+}
+
+/**
+ * Accepts CSS color codes for use with ANSI escape codes.
+ * For example: `#FF000` would be bright red.
+ */
+
+Colorer.prototype.hex = function (color) {
+ return this.rgb.apply(this, hex(color))
+}
+
+/**
+ * Same as `cursor.fg.hex(color)`.
+ */
+
+Cursor.prototype.hex = function (color) {
+ return this.foreground.hex(color)
+}
+
+
+// UTIL FUNCTIONS //
+
+/**
+ * Translates a 255 RGB value to a 0-5 ANSI RGV value,
+ * then returns the single ANSI color code to use.
+ */
+
+function rgb (r, g, b) {
+ var red = r / 255 * 5
+ , green = g / 255 * 5
+ , blue = b / 255 * 5
+ return rgb5(red, green, blue)
+}
+
+/**
+ * Turns rgb 0-5 values into a single ANSI color code to use.
+ */
+
+function rgb5 (r, g, b) {
+ var red = Math.round(r)
+ , green = Math.round(g)
+ , blue = Math.round(b)
+ return 16 + (red*36) + (green*6) + blue
+}
+
+/**
+ * Accepts a hex CSS color code string (# is optional) and
+ * translates it into an Array of 3 RGB 0-255 values, which
+ * can then be used with rgb().
+ */
+
+function hex (color) {
+ var c = color[0] === '#' ? color.substring(1) : color
+ , r = c.substring(0, 2)
+ , g = c.substring(2, 4)
+ , b = c.substring(4, 6)
+ return [parseInt(r, 16), parseInt(g, 16), parseInt(b, 16)]
+}
+
+/**
+ * Turns an array-like object into a real array.
+ */
+
+function toArray (a) {
+ var i = 0
+ , l = a.length
+ , rtn = []
+ for (; i<l; i++) {
+ rtn.push(a[i])
+ }
+ return rtn
+}
Code Review / simantics / district.git / blobdiff