Add colors module (denoland/deno_std#30)

Original: https://github.com/denoland/deno_std/commit/54787f172c62df7c98d8e9e534c40e317825e614

1 files changed, 33 insertions, 0 deletions

diff --git a/colors/main.ts b/colors/main.ts
new file mode 100644
index 000000000..af4e1aace
--- /dev/null
+++ b/colors/main.ts
@@ -0,0 +1,33 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+import { styles } from "./styles.ts";
+
+type Styles = { readonly [S in keyof typeof styles]: Color };
+
+type Color = Styles & {
+  (str: string): string;
+};
+
+const styleStack: string[] = [];
+
+export const color = function color(str: string): string {
+  styleStack.reverse();
+  while (styleStack.length) {
+    const style = styleStack.pop();
+    const code = styles[style];
+    str = `${code.open}${str.replace(code.closeRe, code.open)}${
+      code.close
+    }`.replace(/\r?\n/g, `${code.close}$&${code.open}`);
+  }
+  return str;
+} as Color;
+
+for (const style of Object.keys(styles)) {
+  Object.defineProperty(color, style, {
+    get() {
+      styleStack.push(style);
+      return color;
+    },
+    enumerable: true,
+    configurable: false
+  });
+}