flow like the river

BACK_BACK/node_modules/uncss/bin/uncss

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+#!/usr/bin/env node
+
+'use strict';
+
+(function () {
+    process.title = 'uncss';
+
+    const uncss = require('../src/uncss.js'),
+        data = require('../package.json'),
+        program = require('commander'),
+        fs = require('fs');
+
+    let buffer = '',
+        options;
+
+    function listArg(val) {
+        return val.split(',');
+    }
+
+    program
+        .version(data.version)
+        .usage('[options] <file or URL, ...>\n\t e.g. uncss https://getbootstrap.com/docs/3.3/examples/jumbotron/ > stylesheet.css')
+        .option('-i, --ignore <selector, ...>', 'Do not remove given selectors', listArg)
+        .option('-m, --media <media_query, ...>', 'Process additional media queries', listArg)
+        .option('-C, --csspath <path>', 'Relative path where the CSS files are located')
+        .option('-s, --stylesheets <file, ...>', 'Specify additional stylesheets to process', listArg)
+        .option('-S, --ignoreSheets <selector, ...>', 'Do not include specified stylesheets', listArg)
+        .option('-r, --raw <string>', 'Pass in a raw string of CSS')
+        .option('-t, --timeout <milliseconds>', 'Wait for JS evaluation')
+        .option('-H, --htmlroot <folder>', 'Absolute paths\' root location')
+        .option('-u, --uncssrc <file>', 'Load these options from <file>')
+        .option('-n, --noBanner', 'Disable banner')
+        .option('-a, --userAgent <string>', 'Use a custom useragent string')
+        .option('-I, --inject <file>', 'Path to javascript file to be executed before uncss runs')
+        .option('-o, --output <file>', 'Path to write resulting CSS to')
+        .parse(process.argv);
+
+    options = {
+        ignore: program.ignore,
+        ignoreSheets: program.ignoreSheets,
+        media: program.media,
+        csspath: program.csspath,
+        stylesheets: program.stylesheets,
+        raw: program.raw,
+        timeout: program.timeout,
+        htmlroot: program.htmlroot,
+        uncssrc: program.uncssrc,
+        banner: !program.noBanner,
+        userAgent: program.userAgent,
+        inject: program.inject
+    };
+
+    if (program.args.length) {
+        if (options.ignore) {
+            options.ignore = options.ignore.map((ign) => {
+                /* Create RegExes */
+                if (ign[0] === '/') {
+                    /* Remove starting and trailing '/' */
+                    return new RegExp(ign.slice(1, -1));
+                }
+                return ign;
+            });
+        }
+
+        if (options.ignoreSheets) {
+            options.ignoreSheets = options.ignoreSheets.map((ign) => {
+                /* Create RegExes */
+                if (ign[0] === '/') {
+                    /* Remove starting and trailing '/' */
+                    return new RegExp(ign.slice(1, -1));
+                }
+                return ign;
+            });
+        }
+
+        /* If used from the command line, concatenate the output */
+        uncss(program.args, options, (err, css) => {
+            if (err) {
+                throw err;
+            }
+            if (program.output) {
+                fs.writeFile(program.output, css, 'utf8', (err) => {
+                    if (err) {
+                        throw err;
+                    }
+                    console.log(`${program.output} has been saved!`);
+                });
+            } else {
+                console.log(css);
+            }
+        });
+    } else {
+        /* No files were specified, read HTML from stdin */
+        process.stdin.resume();
+        process.stdin.setEncoding('utf8');
+
+        process.stdin.on('data', (chunk) => {
+            buffer += chunk;
+        });
+
+        process.stdin.on('end', () => {
+            uncss(buffer, options, (err, css) => {
+                if (err) {
+                    throw err;
+                }
+                console.log(css);
+            });
+        });
+    }
+
+}());