Use stdin and stdout

.eslintrc

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+{
+	"parserOptions": {
+        "ecmaVersion": 6,
+        "sourceType": "module",
+        "ecmaFeatures": {
+            "impliedStrict": true
+        }
+	},
+	"env": {
+		"node": true
+	},
+	"rules": {
+		"semi": [2, "always"],
+		"indent": [1, "tab", {"SwitchCase": 1}],
+		"brace-style": [2, "stroustrup"],
+		"no-array-constructor": [2],
+		"space-before-function-paren": [2, "always"],
+		"no-eq-null": 2,
+	}
+}

.gitignore

@@ -1,6 +1,6 @@
-node_modules
-test
-.DS_Store
-LICENSE-MIT
-Gruntfile.js
-npm-debug.log
+node_modules
+test
+.DS_Store
+LICENSE*
+npm-debug.log
+.tern-project

README.md

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+# CSS to LESS
+Convert css to less
+
+```shell
+npm install -g css2less
+```
+
+## Usage:
+>+ `$ css2less [options] <input.css...>`
+
+### CLI Options ###
+#### --indent-size
+Type: `number`
+Default value: `1`
+Desc: Indent size.
+
+#### --indent-symbol
+Type: `string`
+Default value: `\t`
+Desc: Indent symbol.
+
+#### --selector-separator
+Type: `string`
+Default value: `,\n`
+Desc: Selector separator.
+
+#### --block-separator
+Type: `string`
+Default value: `\n`
+Desc: Separator between blocks.
+
+#### --block-on-newline
+Type: `boolean`
+Default value: `false`
+Desc: Start first '{' from the new line
+
+#### --update-colors
+Type: `boolean`
+Default value: `true`
+Desc: Use variables for colors.
+
+#### --vendor-mixins
+Type: `boolean`
+Default value: `true`
+Desc: Create function for vendor styles.
+
+#### --variables-path
+Type: `string`
+Desc: Path to 'variables.less' file where will be all colors stored.
+      Defaultly was colors stored on the top of each file, but with this given path will be generated with name prepended by relative path where 'variables.less' was stored.
+
+## Pure JavaScript usage example:
+```javascript
+var fs = require('fs');
+var css2less = require('css2less');
+
+fs.createReadStream(cssFilePath)
+	.pipe(new css2less(options))
+	.pipe(fs.createWriteStream(lessFilePath));
+```

cli.js

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+#!/usr/bin/env node
+/**
+ * css2less - entry point - command line interface
+ *
+ * Converter of pure CSS into the structured LESS keeping all the imports & comments
+ * and optionally extracting all the colors into variables.
+ * Original code by Serhey Shmyg, continued and extended by Martin Bórik.
+ */
+
+const appname = 'css2less';
+
+const fs = require('fs');
+const path = require('path');
+const meow = require('meow');
+const promisePipe = require("promisepipe");
+
+const css2less = require('./index.js');
+const utils = require('./utils.js');
+
+let cli = meow(`
+	Usage:
+		$ ${appname} [options] <input.css...>
+
+	Options:
+		--indent-size           Indent size (default 1)
+		--indent-symbol         Indentation symbol (default: tab character)
+		--selector-separator    String separator between selectors (default: comma and newline)
+		--block-separator       Separator between blocks (default: newline character)
+		--block-on-newline      Start first '{' from the newline after selector.
+		--update-colors         Create variables for colors.
+		--vendor-mixins         Create function for vendor styles.
+		-var, --variables-path  Path to 'variables.less' file where will be all colors stored.
+							    Defaultly was colors stored on the top of each file, but with
+							    this given path will be generated with name prepended by
+							    relative path where 'variables.less' was stored.
+
+		-h, --help              Show help
+		-v, --version           Version number
+`, {
+	string:  [ 'variables-path', 'indent-symbol', 'selector-separator', 'block-separator' ],
+	boolean: [ 'update-colors', 'vendor-mixins' ],
+	default: {
+		updateColors: true,
+		vendorMixins: false
+	},
+	stopEarly: true,
+	alias: {
+		var: 'variables-path',
+		h: 'help',
+		v: 'version'
+	}
+});
+
+if (!cli.input.length)
+	cli.showHelp();
+
+// file processor...
+utils.processFiles(cli.input, file => {
+	const filePath = path.resolve(process.cwd(), file);
+	const opt = Object.assign({ filePathway: [] }, cli.flags);
+
+	try {
+		if (!fs.statSync(filePath).isFile()) {
+			throw new Error('ENOTFILE');
+		}
+	}
+	catch (err) {
+		return Promise.reject(
+			new Error(`Invalid file: '${file}' (${err.message || err.code})`)
+		);
+	}
+
+	const ext = path.extname(file);
+	if (ext.toLowerCase() !== '.css') {
+		return Promise.reject(
+			new Error(`Invalid file: '${file}': Not a proper extension!`)
+		);
+	}
+
+	const fileDir = path.dirname(filePath);
+	const fileBaseName = path.basename(file, ext);
+	const lessFile = path.join(fileDir, fileBaseName + '.less');
+
+	opt.absFilePath = opt.absBasePath = utils.path2posix(path.resolve(fileDir));
+
+	if (opt.variablesPath) {
+		const varDir = path.dirname(opt.variablesPath);
+		const varRelPath = path.relative(varDir, fileDir);
+
+		if (varRelPath.length > 0) {
+			opt.filePathway = varRelPath.split(path.sep);
+		}
+
+		opt.filePathway.push(fileBaseName);
+		opt.absBasePath = utils.path2posix(path.resolve(varDir));
+	}
+
+	console.log(`Converting '${file}'...`);
+	return promisePipe(
+		fs.createReadStream(filePath),
+		new css2less(opt),
+		fs.createWriteStream(lessFile)
+	).then(stream => {
+		console.log(`> stored into '${lessFile}'.`);
+	}, err => {
+		console.error("> error: ", err.originalError);
+		fs.unlinkSync(lessFile);
+	});
+});

csscolors.json

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+{
+	"aliceblue": "#f0f8ff",
+	"antiquewhite": "#faebd7",
+	"aqua": "#00ffff",
+	"aquamarine": "#7fffd4",
+	"azure": "#f0ffff",
+	"beige": "#f5f5dc",
+	"bisque": "#ffe4c4",
+	"black": "#000000",
+	"blanchedalmond": "#ffebcd",
+	"blue": "#0000ff",
+	"blueviolet": "#8a2be2",
+	"brown": "#a52a2a",
+	"burlywood": "#deb887",
+	"cadetblue": "#5f9ea0",
+	"chartreuse": "#7fff00",
+	"chocolate": "#d2691e",
+	"coral": "#ff7f50",
+	"cornflowerblue": "#6495ed",
+	"cornsilk": "#fff8dc",
+	"crimson": "#dc143c",
+	"cyan": "#00ffff",
+	"darkblue": "#00008b",
+	"darkcyan": "#008b8b",
+	"darkgoldenrod": "#b8860b",
+	"darkgray": "#a9a9a9",
+	"darkgrey": "#a9a9a9",
+	"darkgreen": "#006400",
+	"darkkhaki": "#bdb76b",
+	"darkmagenta": "#8b008b",
+	"darkolivegreen": "#556b2f",
+	"darkorange": "#ff8c00",
+	"darkorchid": "#9932cc",
+	"darkred": "#8b0000",
+	"darksalmon": "#e9967a",
+	"darkseagreen": "#8fbc8f",
+	"darkslateblue": "#483d8b",
+	"darkslategray": "#2f4f4f",
+	"darkslategrey": "#2f4f4f",
+	"darkturquoise": "#00ced1",
+	"darkviolet": "#9400d3",
+	"deeppink": "#ff1493",
+	"deepskyblue": "#00bfff",
+	"dimgray": "#696969",
+	"dimgrey": "#696969",
+	"dodgerblue": "#1e90ff",
+	"firebrick": "#b22222",
+	"floralwhite": "#fffaf0",
+	"forestgreen": "#228b22",
+	"fuchsia": "#ff00ff",
+	"gainsboro": "#dcdcdc",
+	"ghostwhite": "#f8f8ff",
+	"gold": "#ffd700",
+	"goldenrod": "#daa520",
+	"gray": "#808080",
+	"grey": "#808080",
+	"green": "#008000",
+	"greenyellow": "#adff2f",
+	"honeydew": "#f0fff0",
+	"hotpink": "#ff69b4",
+	"indianred": "#cd5c5c",
+	"indigo": "#4b0082",
+	"ivory": "#fffff0",
+	"khaki": "#f0e68c",
+	"lavender": "#e6e6fa",
+	"lavenderblush": "#fff0f5",
+	"lawngreen": "#7cfc00",
+	"lemonchiffon": "#fffacd",
+	"lightblue": "#add8e6",
+	"lightcoral": "#f08080",
+	"lightcyan": "#e0ffff",
+	"lightgoldenrodyellow": "#fafad2",
+	"lightgray": "#d3d3d3",
+	"lightgrey": "#d3d3d3",
+	"lightgreen": "#90ee90",
+	"lightpink": "#ffb6c1",
+	"lightsalmon": "#ffa07a",
+	"lightseagreen": "#20b2aa",
+	"lightskyblue": "#87cefa",
+	"lightslategray": "#778899",
+	"lightslategrey": "#778899",
+	"lightsteelblue": "#b0c4de",
+	"lightyellow": "#ffffe0",
+	"lime": "#00ff00",
+	"limegreen": "#32cd32",
+	"linen": "#faf0e6",
+	"magenta": "#ff00ff",
+	"maroon": "#800000",
+	"mediumaquamarine": "#66cdaa",
+	"mediumblue": "#0000cd",
+	"mediumorchid": "#ba55d3",
+	"mediumpurple": "#9370db",
+	"mediumseagreen": "#3cb371",
+	"mediumslateblue": "#7b68ee",
+	"mediumspringgreen": "#00fa9a",
+	"mediumturquoise": "#48d1cc",
+	"mediumvioletred": "#c71585",
+	"midnightblue": "#191970",
+	"mintcream": "#f5fffa",
+	"mistyrose": "#ffe4e1",
+	"moccasin": "#ffe4b5",
+	"navajowhite": "#ffdead",
+	"navy": "#000080",
+	"oldlace": "#fdf5e6",
+	"olive": "#808000",
+	"olivedrab": "#6b8e23",
+	"orange": "#ffa500",
+	"orangered": "#ff4500",
+	"orchid": "#da70d6",
+	"palegoldenrod": "#eee8aa",
+	"palegreen": "#98fb98",
+	"paleturquoise": "#afeeee",
+	"palevioletred": "#db7093",
+	"papayawhip": "#ffefd5",
+	"peachpuff": "#ffdab9",
+	"peru": "#cd853f",
+	"pink": "#ffc0cb",
+	"plum": "#dda0dd",
+	"powderblue": "#b0e0e6",
+	"purple": "#800080",
+	"rebeccapurple": "#663399",
+	"red": "#ff0000",
+	"rosybrown": "#bc8f8f",
+	"royalblue": "#4169e1",
+	"saddlebrown": "#8b4513",
+	"salmon": "#fa8072",
+	"sandybrown": "#f4a460",
+	"seagreen": "#2e8b57",
+	"seashell": "#fff5ee",
+	"sienna": "#a0522d",
+	"silver": "#c0c0c0",
+	"skyblue": "#87ceeb",
+	"slateblue": "#6a5acd",
+	"slategray": "#708090",
+	"slategrey": "#708090",
+	"snow": "#fffafa",
+	"springgreen": "#00ff7f",
+	"steelblue": "#4682b4",
+	"tan": "#d2b48c",
+	"teal": "#008080",
+	"thistle": "#d8bfd8",
+	"tomato": "#ff6347",
+	"turquoise": "#40e0d0",
+	"violet": "#ee82ee",
+	"wheat": "#f5deb3",
+	"white": "#ffffff",
+	"whitesmoke": "#f5f5f5",
+	"yellow": "#ffff00",
+	"yellowgreen": "#9acd32"
+}

cssprops.json

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+["align-content:", "align-items:", "align-self:", "animation:", "animation-delay:", "animation-direction:", "animation-duration:", "animation-fill-mode:", "animation-iteration-count:", "animation-name:", "animation-play-state:", "animation-timing-function:", "backface-visibility:", "background:", "background-attachment:", "background-blend-mode:", "background-clip:", "background-color:", "background-image:", "background-origin:", "background-position:", "background-repeat:", "background-size:", "border:", "border-bottom:", "border-bottom-color:", "border-bottom-left-radius:", "border-bottom-right-radius:", "border-bottom-style:", "border-bottom-width:", "border-collapse:", "border-color:", "border-image:", "border-image-outset:", "border-image-repeat:", "border-image-slice:", "border-image-source:", "border-image-width:", "border-left:", "border-left-color:", "border-left-style:", "border-left-width:", "border-radius:", "border-right:", "border-right-color:", "border-right-style:", "border-right-width:", "border-spacing:", "border-style:", "border-top:", "border-top-color:", "border-top-left-radius:", "border-top-right-radius:", "border-top-style:", "border-top-width:", "border-width:", "bottom:", "box-shadow:", "box-sizing:", "caption-side:", "clear:", "clip:", "color:", "column-count:", "column-fill:", "column-gap:", "column-rule:", "column-rule-color:", "column-rule-style:", "column-rule-width:", "column-span:", "column-width:", "columns:", "content:", "counter-increment:", "counter-reset:", "cursor:", "direction:", "display:", "empty-cells:", "filter:", "flex:", "flex-basis:", "flex-direction:", "flex-flow:", "flex-grow:", "flex-shrink:", "flex-wrap:", "float:", "font:", "@font-face:", "font-family:", "font-size:", "font-size-adjust:", "font-stretch:", "font-style:", "font-variant:", "font-weight:", "hanging-punctuation:", "height:", "justify-content:", "@keyframes:", "left:", "letter-spacing:", "line-height:", "list-style:", "list-style-image:", "list-style-position:", "list-style-type:", "margin:", "margin-bottom:", "margin-left:", "margin-right:", "margin-top:", "max-height:", "max-width:", "@media:", "min-height:", "min-width:", "nav-down:", "nav-index:", "nav-left:", "nav-right:", "nav-up:", "opacity:", "order:", "outline:", "outline-color:", "outline-offset:", "outline-style:", "outline-width:", "overflow:", "overflow-x:", "overflow-y:", "padding:", "padding-bottom:", "padding-left:", "padding-right:", "padding-top:", "page-break-after:", "page-break-before:", "page-break-inside:", "perspective:", "perspective-origin:", "position:", "quotes:", "resize:", "right:", "tab-size:", "table-layout:", "text-align:", "text-align-last:", "text-decoration:", "text-decoration-color:", "text-decoration-line:", "text-decoration-style:", "text-indent:", "text-justify:", "text-overflow:", "text-shadow:", "text-transform:", "top:", "transform:", "transform-origin:", "transform-style:", "transition:", "transition-delay:", "transition-duration:", "transition-property:", "transition-timing-function:", "unicode-bidi:", "vertical-align:", "visibility:", "white-space:", "width:", "word-break:", "word-spacing:", "word-wrap:", "z-index:"]