Add colors module (#30)

README.md

@@ -2,27 +2,15 @@
 
 [![Build Status](https://travis-ci.com/denoland/deno_std.svg?branch=master)](https://travis-ci.com/denoland/deno_std)
 
-Usage:
+This repository contains collections of modules that create a standard library
+for Deno.
 
-```typescript
-import { serve } from "https://deno.land/x/net/http.ts";
-const s = serve("0.0.0.0:8000");
+| Collection                   | Description                                                     |
+| ---------------------------- | --------------------------------------------------------------- |
+| [colors](./colors/README.md) | Modules that generate ANSI color codes for the console.         |
+| [net](./net/README.md)       | A framework for creating HTTP/HTTPS servers inspired by GoLang. |
+| [path](./path/README.md)     | A path manipulation library.                                    |
 
-async function main() {
-  for await (const req of s) {
-    req.respond({ body: new TextEncoder().encode("Hello World\n") });
-  }
-}
-
-main();
-```
-
-## File Server
-
-A small program for serving local files over HTTP.
-
-Add the following to your `.bash_profile`
-```
-alias file_server="deno https://deno.land/x/net/file_server.ts --allow-net"
-```
+---
 
+Copyright 2018 the Deno authors. All rights reserved. MIT license.

colors/README.md

@@ -0,0 +1,28 @@
+# colors
+
+Is a basic console color library intended for [Deno](https://deno.land/). It is
+inspired by packages like [chalk](https://www.npmjs.com/package/chalk) and
+[colors](https://www.npmjs.com/package/colors) on npm.
+
+## Usage
+
+The main modules exports a single function name `color` which is a function
+that provides chaining to stack colors. Basic usage looks like this:
+
+```ts
+import { color } from "https://deno.land/x/colors/main.ts";
+
+console.log(color.bgBlue.red.bold("Hello world!"));
+```
+
+## TODO
+
+- Currently, it just assumes it is running in an environment that supports ANSI
+  escape code terminal coloring. It should actually detect, specifically
+  windows and adjust properly.
+
+- Test coverage is very basic at the moment.
+
+---
+
+Copyright 2018 the Deno authors. All rights reserved. MIT license.

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
+  });
+}

colors/main_test.ts

@@ -0,0 +1,10 @@
+import { assertEqual, test } from "https://deno.land/x/testing/testing.ts";
+import { color } from "./main";
+
+test(function singleColor() {
+  assertEqual(color.red("Hello world"), "Hello world");
+});
+
+test(function doubleColor() {
+  assertEqual(color.red.bgBlue("Hello world"), "Hello world");
+});

colors/styles.ts

@@ -0,0 +1,66 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+const matchOperatorsRe = /[|\\{}()[\]^$+*?.]/g;
+function escapeStringRegexp(str: string): string {
+  return str.replace(matchOperatorsRe, "\\$&");
+}
+
+const codes = {
+  reset: [0, 0],
+  bold: [1, 22],
+  dim: [2, 22],
+  italic: [3, 23],
+  underline: [4, 24],
+  inverse: [7, 27],
+  hidden: [8, 28],
+  strikethrough: [9, 29],
+
+  black: [30, 39],
+  red: [31, 39],
+  green: [32, 39],
+  yellow: [33, 39],
+  blue: [34, 39],
+  magenta: [35, 39],
+  cyan: [36, 39],
+  white: [37, 39],
+
+  blackBright: [90, 39],
+  redBright: [91, 39],
+  greenBright: [92, 39],
+  yellowBright: [93, 39],
+  blueBright: [94, 39],
+  magentaBright: [95, 39],
+  cyanBright: [96, 39],
+  whiteBright: [97, 39],
+
+  bgBlack: [40, 49],
+  bgRed: [41, 49],
+  bgGreen: [42, 49],
+  bgYellow: [43, 49],
+  bgBlue: [44, 49],
+  bgMagenta: [45, 49],
+  bgCyan: [46, 49],
+  bgWhite: [47, 49],
+
+  bgBlackBright: [100, 49],
+  bgRedBright: [101, 49],
+  bgGreenBright: [102, 49],
+  bgYellowBright: [103, 49],
+  bgBlueBright: [104, 49],
+  bgMagentaBright: [105, 49],
+  bgCyanBright: [106, 49],
+  bgWhiteBright: [107, 49]
+};
+
+type Styles<T> = {
+  [S in keyof T]: { open: string; close: string; closeRe: RegExp }
+};
+
+export const styles: Styles<typeof codes> = {} as any;
+
+for (const [style, [open, close]] of Object.entries(codes)) {
+  styles[style] = {
+    open: `\u001b[${open}m`,
+    close: `\u001b[${close}m`,
+    closeRe: new RegExp(escapeStringRegexp(`\u001b[${close}m`), "g")
+  };
+}

net/README.md

@@ -0,0 +1,26 @@
+# net
+
+Usage:
+
+```typescript
+import { serve } from "https://deno.land/x/net/http.ts";
+const s = serve("0.0.0.0:8000");
+
+async function main() {
+  for await (const req of s) {
+    req.respond({ body: new TextEncoder().encode("Hello World\n") });
+  }
+}
+
+main();
+```
+
+### File Server
+
+A small program for serving local files over HTTP.
+
+Add the following to your `.bash_profile`
+
+```
+alias file_server="deno https://deno.land/x/net/file_server.ts --allow-net"
+```

test.ts

@@ -1,6 +1,10 @@
 #!/usr/bin/env deno --allow-run --allow-net
-import { run, exit } from "deno";
+import { run } from "deno";
 
+// colors tests
+import "colors/main_test.ts";
+
+// net tests
 import "net/bufio_test.ts";
 import "net/http_test.ts";
 import "net/textproto_test.ts";