1 files changed, 92 insertions, 0 deletions
diff --git a/runtime/js/01_colors.js b/runtime/js/01_colors.js
new file mode 100644
index 000000000..39e4a7a18
--- /dev/null
+++ b/runtime/js/01_colors.js
@@ -0,0 +1,92 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+((window) => {
+  function code(open, close) {
+    return {
+      open: `\x1b[${open}m`,
+      close: `\x1b[${close}m`,
+      regexp: new RegExp(`\\x1b\\[${close}m`, "g"),
+    };
+  }
+
+  function run(str, code) {
+    return `${code.open}${str.replace(code.regexp, code.open)}${code.close}`;
+  }
+
+  function bold(str) {
+    return run(str, code(1, 22));
+  }
+
+  function italic(str) {
+    return run(str, code(3, 23));
+  }
+
+  function yellow(str) {
+    return run(str, code(33, 39));
+  }
+
+  function cyan(str) {
+    return run(str, code(36, 39));
+  }
+
+  function red(str) {
+    return run(str, code(31, 39));
+  }
+
+  function green(str) {
+    return run(str, code(32, 39));
+  }
+
+  function bgRed(str) {
+    return run(str, code(41, 49));
+  }
+
+  function white(str) {
+    return run(str, code(37, 39));
+  }
+
+  function gray(str) {
+    return run(str, code(90, 39));
+  }
+
+  function magenta(str) {
+    return run(str, code(35, 39));
+  }
+
+  function dim(str) {
+    return run(str, code(2, 22));
+  }
+
+  // https://github.com/chalk/ansi-regex/blob/2b56fb0c7a07108e5b54241e8faec160d393aedb/index.js
+  const ANSI_PATTERN = new RegExp(
+    [
+      "[\\u001B\\u009B][[\\]()#;?]*(?:(?:(?:[a-zA-Z\\d]*(?:;[-a-zA-Z\\d\\/#&.:=?%@~_]*)*)?\\u0007)",
+      "(?:(?:\\d{1,4}(?:;\\d{0,4})*)?[\\dA-PR-TZcf-ntqry=><~]))",
+    ].join("|"),
+    "g",
+  );
+
+  function stripColor(string) {
+    return string.replace(ANSI_PATTERN, "");
+  }
+
+  function maybeColor(fn) {
+    return !(globalThis.Deno?.noColor ?? false) ? fn : (s) => s;
+  }
+
+  window.__bootstrap.colors = {
+    bold,
+    italic,
+    yellow,
+    cyan,
+    red,
+    green,
+    bgRed,
+    white,
+    gray,
+    magenta,
+    dim,
+    stripColor,
+    maybeColor,
+  };
+})(this);