Add big bang of life

bang.js

@@ -0,0 +1,79 @@
+'use strict'
+// http://bit.ly/fx--life
+
+const
+  run = f => setInterval(f, 16),
+  p = (s) => process.stdout.write(s),
+  esc = (...x) => x.map(i => p('\u001B[' + i)),
+  [upper, lower, full] = ['\u2580', '\u2584', '\u2588'],
+  {columns, rows} = process.stdout,
+  [w, h] = [columns, rows * 2],
+  a = Math.floor(w / 2) - 6, b = Math.floor(h / 2) - 7
+
+let $ = Array(w * h).fill(false)
+if (process.env.GUN) {
+  $[1 + 5 * w] = $[1 + 6 * w] = $[2 + 5 * w] = $[2 + 6 * w] = $[12 + 5 * w] = $[12 + 6 * w] = $[12 + 7 * w] = $[13 + 4 * w] = $[13 + 8 * w] = $[14 + 3 * w] = $[14 + 9 * w] = $[15 + 4 * w] = $[15 + 8 * w] = $[16 + 5 * w] = $[16 + 6 * w] = $[16 + 7 * w] = $[17 + 5 * w] = $[17 + 6 * w] = $[17 + 7 * w] = $[22 + 3 * w] = $[22 + 4 * w] = $[22 + 5 * w] = $[23 + 2 * w] = $[23 + 3 * w] = $[23 + 5 * w] = $[23 + 6 * w] = $[24 + 2 * w] = $[24 + 3 * w] = $[24 + 5 * w] = $[24 + 6 * w] = $[25 + 2 * w] = $[25 + 3 * w] = $[25 + 4 * w] = $[25 + 5 * w] = $[25 + 6 * w] = $[26 + 1 * w] = $[26 + 2 * w] = $[26 + 6 * w] = $[26 + 7 * w] = $[35 + 3 * w] = $[35 + 4 * w] = $[36 + 3 * w] = $[36 + 4 * w] = true
+} else if (process.env.RANDOM) {
+  for (let i = 0; i < $.length; i++)
+    if (Math.random() < 0.16) $[i] = true
+} else {
+  $[a + 1 + (2 + b) * w] = $[a + 2 + (1 + b) * w] = $[a + 2 + (3 + b) * w] = $[a + 3 + (2 + b) * w] = $[a + 5 + (15 + b) * w] = $[a + 6 + (13 + b) * w] = $[a + 6 + (15 + b) * w] = $[a + 7 + (12 + b) * w] = $[a + 7 + (13 + b) * w] = $[a + 7 + (15 + b) * w] = $[a + 9 + (11 + b) * w] = $[a + 9 + (12 + b) * w] = $[a + 9 + (13 + b) * w] = true
+}
+
+function at(i, j) {
+  if (i < 0) i = h - 1
+  if (i >= h) i = 0
+  if (j < 0) j = w - 1
+  if (j >= w) j = 0
+  return $[i * w + j]
+}
+
+function neighbors(i, j) {
+  let c = 0
+  at(i - 1, j - 1) && c++
+  at(i - 1, j) && c++
+  at(i - 1, j + 1) && c++
+  at(i, j - 1) && c++
+  at(i, j + 1) && c++
+  at(i + 1, j - 1) && c++
+  at(i + 1, j) && c++
+  at(i + 1, j + 1) && c++
+  return c
+}
+
+run(() => {
+  esc('H')
+
+  let gen = Array(w * h).fill(false)
+  for (let i = 0; i < h; i++) {
+    for (let j = 0; j < w; j++) {
+      const n = neighbors(i, j)
+      const z = i * w + j
+      if ($[z]) {
+        if (n < 2) gen[z] = false
+        if (n === 2 || n === 3) gen[z] = true
+        if (n > 3) gen[z] = false
+      } else {
+        if (n === 3) gen[z] = true
+      }
+    }
+  }
+  $ = gen
+
+  for (let i = 0; i < rows; i++) {
+    for (let j = 0; j < columns; j++) {
+      if ($[i * 2 * w + j] && $[(i * 2 + 1) * w + j]) p(full)
+      else if ($[i * 2 * w + j] && !$[(i * 2 + 1) * w + j]) p(upper)
+      else if (!$[i * 2 * w + j] && $[(i * 2 + 1) * w + j]) p(lower)
+      else p(' ')
+    }
+    if (i !== rows - 1) p('\n')
+  }
+})
+
+esc('2J', '?25l')
+
+process.on('SIGINT', () => {
+  esc('?25h')
+  process.exit(2)
+})

index.js

@@ -52,6 +52,9 @@ function main(input) {
       stderr.write(require('./package.json').version + '\n')
       process.exit(2)
     }
+    if (args.length === 1 && args[0] === '--life') {
+      return require('./bang')
+    }
 
     input = fs.readFileSync(args[0])
     filename = path.basename(args[0])

package.json

@@ -9,6 +9,7 @@
     "fx": "index.js"
   },
   "files": [
+    "bang.js",
     "config.js",
     "find.js",
     "fx.js",