Merge branch 'feature/the-actual-tomato-sauce' into develop

11 files changed, 373 insertions, 0 deletions

diff --git a/lib/renderers/256_colors.js b/lib/renderers/256_colors.js
new file mode 100644
index 0000000..e8e6e37
--- /dev/null
+++ b/lib/renderers/256_colors.js
@@ -0,0 +1,16 @@
+'use strict';
+
+// Returns a 256 color, see
+// https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
+// under 256 colors for more info.
+const TwoFiftySixColors = function (red, blue, green) {
+  let redValue = Math.round(red * 5 / 255);
+  let blueValue = Math.round(blue * 5 / 255);
+  let greenValue = Math.round(green * 5 / 255);
+
+  let colorNumber = 16 + 36 * redValue + 6 * greenValue + blueValue;
+
+  return `\x1B[48;5;${colorNumber}m`;
+};
+
+module.exports = TwoFiftySixColors;
diff --git a/lib/renderers/ansi.js b/lib/renderers/ansi.js
new file mode 100644
index 0000000..c3975da
--- /dev/null
+++ b/lib/renderers/ansi.js
@@ -0,0 +1,13 @@
+'use strict';
+
+// Returns a basic ANSI color. See the color table in:
+// https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
+const ANSI = function (red, blue, green) {
+  let colorOffset = Math.round((red + blue + green) * 7 / (255 * 3));
+
+  let colorNumber = 40 + colorOffset;
+
+  return `\x1B[${colorNumber}m`;
+};
+
+module.exports = ANSI;
diff --git a/lib/renderers/fake_color.js b/lib/renderers/fake_color.js
new file mode 100644
index 0000000..b82bb45
--- /dev/null
+++ b/lib/renderers/fake_color.js
@@ -0,0 +1,8 @@
+'use strict';
+
+// Sends malformed ANSI 24-bit color strings
+const FakeColor = function (red, blue, green) {
+  return `\x1B[28;2;${Math.round(red)};${Math.round(green)};${Math.round(blue)}m`;
+};
+
+module.exports = FakeColor;
diff --git a/lib/renderers/true_color.js b/lib/renderers/true_color.js
new file mode 100644
index 0000000..5f7725f
--- /dev/null
+++ b/lib/renderers/true_color.js
@@ -0,0 +1,11 @@
+'use strict';
+
+// Returns an ANSI Code for True Color, see:
+// https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
+// and look for 24-bit colors. Only looks good in supported terminals,
+// otherwise looks like FakeColor.
+const TrueColor = function (red, blue, green) {
+  return `\x1B[48;2;${Math.round(red)};${Math.round(green)};${Math.round(blue)}m`;
+};
+
+module.exports = TrueColor;
diff --git a/lib/screens/circle.js b/lib/screens/circle.js
new file mode 100644
index 0000000..d8a4d10
--- /dev/null
+++ b/lib/screens/circle.js
@@ -0,0 +1,32 @@
+'use strict';
+
+// Draws concentric circles. Each ring has its own color.
+const Circle = function (modulation, width, height, renderer) {
+  let response = [];
+
+  let circles = width > height ? height : width;
+
+  for (let i = 0; i < circles; i++) {
+    let centerX = Math.round(width / 2) + 1;
+    let centerY = Math.round(height / 2) + 1;
+
+    let red = Math.floor(Math.random() * 255);
+    let blue = Math.floor(Math.random() * 255);
+    let green = Math.floor(Math.random() * 255);
+
+    for (let j = 0; j < 180; j++) {
+      let angle =  2 * j * (Math.PI / 180);
+      let x = Math.round(centerX + Math.sin(angle) * i);
+      let y = Math.round(centerY + Math.cos(angle) * i);
+
+      if (x <= width && x > 0 && y <= height && y > 0) {
+        let position = `\x1B[${y};${x}H`; // Move cursor to y,x (CSI y;x H)
+        response += `${position}${renderer(red, blue, green)} `;
+      }
+    }
+  }
+
+  return response;
+};
+
+module.exports = Circle;
diff --git a/lib/screens/gradients.js b/lib/screens/gradients.js
new file mode 100644
index 0000000..5e63d5b
--- /dev/null
+++ b/lib/screens/gradients.js
@@ -0,0 +1,25 @@
+'use strict';
+
+// Draws moving gradient boxes.
+const Gradients = function (modulation, width, height, renderer) {
+  let response = '';
+
+  for (let i = 0; i < height; i++) {
+    for (let j = 0; j < width; j++) {
+      let red = ((modulation + i) * 255 / height) % 255;
+      let blue = ((modulation + j) * 255 / width) % 255;
+      let green = ((modulation + i * j) * 255 / (width * height)) % 255;
+
+      response = response + renderer(red, blue, green);
+      response = response + ' ';
+    }
+
+    if (i < height - 1) {
+      response = response + '\n';
+    }
+  }
+
+  return response;
+};
+
+module.exports = Gradients;
diff --git a/lib/screens/mirrors.js b/lib/screens/mirrors.js
new file mode 100644
index 0000000..d683fb6
--- /dev/null
+++ b/lib/screens/mirrors.js
@@ -0,0 +1,36 @@
+'use strict';
+
+// Draws small moving gradient boxes and repeats them.
+const Mirrors = function (modulation, width, height, renderer) {
+  let response = [];
+
+  let scale = 2 + Math.round(Math.random() * 4);
+  let scaledHeight = Math.floor(height / scale);
+  let scaledWidth = Math.floor(width / scale);
+
+  for (let i = 0; i < scaledHeight; i++) {
+    let row = [];
+    for (let j = 0; j < scaledWidth; j++) {
+      let red = ((modulation + i) * 255 / height) % 255;
+      let blue = ((modulation + j) * 255 / width) % 255;
+      let green = ((modulation + i * j) * 255 / (width * height)) % 255;
+
+      let cell = [renderer(red, blue, green), ' '];
+      row.push(cell.join(''));
+    }
+
+    let rowText = '';
+    for (let j = 0; j < scale; j++) {
+      rowText += row.reverse().join('');
+    }
+
+    for (let j = 1; j < scale; j++) {
+      response[j * i] = rowText;
+      response[(height - 1 - (j * i))] = rowText;
+    }
+  }
+
+  return response.join('\n');
+};
+
+module.exports = Mirrors;
diff --git a/lib/screens/random.js b/lib/screens/random.js
new file mode 100644
index 0000000..6ac706f
--- /dev/null
+++ b/lib/screens/random.js
@@ -0,0 +1,25 @@
+'use strict';
+
+// random colors
+const Random = function (modulation, width, height, renderer) {
+  let response = '';
+
+  for (let i = 0; i < height; i++) {
+    for (let j = 0; j < width; j++) {
+      let red = Math.floor(Math.random() * 255);
+      let blue = Math.floor(Math.random() * 255);
+      let green = Math.floor(Math.random() * 255);
+
+      response = response + renderer(red, blue, green);
+      response = response + ' ';
+    }
+
+    if (i < height - 1) {
+      response = response + '\n';
+    }
+  }
+
+  return response;
+};
+
+module.exports = Random;
diff --git a/lib/screens/sprinkles.js b/lib/screens/sprinkles.js
new file mode 100644
index 0000000..446f46e
--- /dev/null
+++ b/lib/screens/sprinkles.js
@@ -0,0 +1,28 @@
+'use strict';
+
+// Places random sprinkles in the screen each frame. Same color per
+// frame.
+const Sprinkles = function (modulation, width, height, renderer) {
+  let response = '';
+
+  let maxSprinkleCount = (width * height) / 2;
+  let minSprinkleCount = (width * height) / 8;
+  let sprinkleCount = Math.round(Math.random() * (maxSprinkleCount - minSprinkleCount)) + minSprinkleCount;
+
+  let red = Math.floor(Math.random() * 255);
+  let blue = Math.floor(Math.random() * 255);
+  let green = Math.floor(Math.random() * 255);
+
+  for (let i = 0; i < sprinkleCount; i++) {
+    let x = Math.round(Math.random() * (width - 1)) + 1;
+    let y = Math.round(Math.random() * (height - 1)) + 1;
+
+    let position = `\x1B[${y};${x}H`; // Move cursor to y,x (CSI y;x H)
+
+    response += `${position}${renderer(red, blue, green)} `;
+  }
+
+  return response;
+};
+
+module.exports = Sprinkles;
diff --git a/lib/tomato_sauce.js b/lib/tomato_sauce.js
new file mode 100644
index 0000000..0ff087a
--- /dev/null
+++ b/lib/tomato_sauce.js
@@ -0,0 +1,129 @@
+'use strict';
+
+const Net = require('net');
+const EventEmitter = require('events');
+
+const Util = require('./util');
+
+// Interpret as Command Sequences.
+const kEscape = new Buffer([0xFF, 0xF4, 0XFF, 0xFD, 0x06]); // IAC IP IAC DO TIMING_MARK
+const kNAWSRequest = new Buffer([0xFF, 0xFD, 0X1F]); // IAC DO NAWS
+const kNAWSResponse = new Buffer([0xFF, 0xFB, 0X1F, 0xFF, 0xFA, 0X1F]); // IAC WILL NAWS IAC SB NAWS
+
+// Main tomato sauce class. Properties:
+// * screens <TomatoSauce.IScreen[]>
+// * renderers <TomatoSauce.IRenderer[]>
+// * port <int>
+// * frequency <int>
+// * modulation <int>
+//
+// The main entry point is the #run() function.
+//
+// It emits a listening event that contains the server information on
+// the `server` key inside the `data` property of the event.
+//
+// It also emits an error event that contains the error information on
+// the `error` key inside the `data` property of the event.
+const TomatoSauce = class TomatoSauce extends EventEmitter {
+
+  constructor (config) {
+    super();
+
+    this.screens = [];
+    this.renderers = [];
+
+    Object.assign(this, config || {});
+  }
+
+  // Here's where things get started.
+  run () {
+    this._startServer();
+    this._bindEvents();
+  }
+
+  // Creates a socket, server based on the configuration. Emits the
+  // listening event when ready.
+  _startServer () {
+    const server = Net.createServer();
+    this.server = server;
+    server.listen(this.port, function () {
+      this.emit('listening', {
+        data: {
+          server: server
+        }
+      });
+    }.bind(this));
+  }
+
+  _bindEvents () {
+    // Send the error event all the way up.
+    this.server.on('error', function (err) {
+      this.emit('error', {
+        data: {
+          error: err
+        }
+      });
+    }.bind(this));
+
+    // Send the error event all the way up.
+    this.server.on('connection', function (socket) {
+      this._renderScreen(socket);
+    }.bind(this));
+  }
+
+  // Obtains viewport size, and initializes a random screen with a random
+  // renderer, setting the required interval to draw.
+  _renderScreen (socket) {
+    let connectionData = {
+      width: null,
+      height: null,
+      modulation: 0,
+      screen: this._getScreen(),
+      renderer: this._getRenderer(),
+      socket: socket
+    };
+    let interval = null;
+
+    socket.write(kNAWSRequest);
+
+    socket.on('data', function (data) {
+      if (data.slice(0, 6).compare(kNAWSResponse) === 0) {
+        connectionData.width = Util.parse16BitBuffer(data.slice(6, 8));
+        connectionData.height = Util.parse16BitBuffer(data.slice(8, 10));
+
+        socket.write('\x1B[2J'); // Clear the Screen (CSI 2 J)
+        interval = setInterval(this._writeMessage.bind(this, connectionData), this.frequency);
+      }
+
+      if (data.compare(kEscape) === 0) {
+        socket.write('\n');
+        clearInterval(interval);
+        socket.end();
+      }
+    }.bind(this));
+  }
+
+  // Resets the cursor, gets a frame and sends it to the socket.
+  _writeMessage (connectionData) {
+    let payload = connectionData.screen(connectionData.modulation, connectionData.width, connectionData.height, connectionData.renderer);
+    let message = `\x1B[1;1H${payload}`; // reset cursor position before payload
+
+    connectionData.modulation = (connectionData.modulation + this.modulation) % 256;
+    connectionData.socket.write(message);
+  }
+
+  _getScreen () {
+    return Util.pickRandom(this.screens);
+  }
+
+  _getRenderer () {
+    return Util.pickRandom(this.renderers);
+  }
+};
+
+// Defaults.
+TomatoSauce.prototype.port = 9999;
+TomatoSauce.prototype.frequency = 333;
+TomatoSauce.prototype.modulation = 5;
+
+module.exports = TomatoSauce;
diff --git a/lib/util.js b/lib/util.js
new file mode 100644
index 0000000..3234d3e
--- /dev/null
+++ b/lib/util.js
@@ -0,0 +1,50 @@
+'use strict';
+
+const Fs = require('fs');
+const Path = require('path');
+
+// Module containing utility functions.
+const Util = {
+
+  // Parses a 16 bit number buffer.
+  parse16BitBuffer: function (buffer) {
+    return buffer[0] * 256 + buffer[1];
+  },
+
+  // Picks a random element from an array.
+  pickRandom: function (array) {
+    return array[Math.floor(Math.random() * array.length)];
+  },
+
+  // For a given path, requires all of the files and returns an array
+  // with the results. If the directory contains any non-requireable file,
+  // it will fail.
+  loadFiles: function (path) {
+    return new Promise(function (resolve, reject) {
+      Fs.readdir(path, function (err, files) {
+        if (err) {
+          return reject(err);
+        }
+
+        let loadedFiles = [];
+
+        for (let file of files) {
+          let filePath = Path.join(path, file);
+          let loadedFile;
+
+          try {
+            loadedFile = require(filePath);
+          } catch (err) {
+            return reject(err);
+          }
+
+          loadedFiles.push(loadedFile);
+        }
+
+        resolve(loadedFiles);
+      });
+    });
+  }
+};
+
+module.exports = Util;