nagix/chartjs-plugin-colorschemes

/* global Promise */

var gulp = require('gulp');
var eslint = require('gulp-eslint');
var file = require('gulp-file');
var replace = require('gulp-replace');
var streamify = require('gulp-streamify');
var zip = require('gulp-zip');
var karma = require('karma');
var merge = require('merge2');
var path = require('path');
var {exec} = require('child_process');
var pkg = require('./package.json');

var argv = require('yargs')
    .option('output', {alias: 'o', default: 'dist'})
    .option('samples-dir', {default: 'samples'})
    .option('docs-dir', {default: 'docs'})
    .argv;

function run(bin, args) {
    return new Promise((resolve, reject) => {
        var exe = '"' + process.execPath + '"';
        var src = require.resolve(bin);
        var ps = exec([exe, src].concat(args || []).join(' '));

        ps.stdout.pipe(process.stdout);
        ps.stderr.pipe(process.stderr);
        ps.on('close', (error) => {
            if (error) {
                reject(error);
            } else {
                resolve();
            }
        });
    });
}

gulp.task('build', function() {
    return run('rollup/dist/bin/rollup', ['-c', argv.watch ? '--watch' : '']);
});

gulp.task('test', function(done) {
    new karma.Server({
        configFile: path.join(__dirname, 'karma.config.js'),
        singleRun: !argv.watch,
        args: {
            coverage: !!argv.coverage,
            inputs: (argv.inputs || 'test/specs/**/*.js').split(';'),
            watch: argv.watch
        }
    },
    function(error) {
        // https://github.com/karma-runner/gulp-karma/issues/18
        error = error ? new Error('Karma returned with the error code: ' + error) : undefined;
        done(error);
    }).start();
});

gulp.task('lint', function() {
    var files = [
        'docs/**/*.html',
        'samples/**/*.html',
        'src/**/*.js',
        'test/**/*.js',
        '*.js'
    ];

    var options = {
        rules: {
            complexity: [1, 10],
            'max-statements': [1, 30]
        }
    };

    return gulp.src(files)
        .pipe(eslint(options))
        .pipe(eslint.format())
        .pipe(eslint.failAfterError());
});

gulp.task('samples', function() {
    // since we moved the dist files one folder up (package root), we need to rewrite
    // samples src="../dist/ to src="../ and then copy them in the /samples directory.
    var out = path.join(argv.output, argv.samplesDir);
    return gulp.src('samples/**/*', {base: 'samples'})
        .pipe(streamify(replace(/src="((?:\.\.\/)+)dist\//g, 'src="$1', {skipBinary: true})))
        .pipe(gulp.dest(out));
});

gulp.task('package', gulp.series(gulp.parallel('build', 'samples'), function() {
    var out = argv.output;
    var streams = merge(
        gulp.src(path.join(out, argv.samplesDir, '**/*'), {base: out}),
        gulp.src([path.join(out, '*.js'), 'LICENSE.md'])
    );

    return streams
        .pipe(zip(pkg.name + '.zip'))
        .pipe(gulp.dest(out));
}));

gulp.task('bower', function() {
    var json = JSON.stringify({
        name: pkg.name,
        description: pkg.description,
        homepage: pkg.homepage,
        license: pkg.license,
        version: pkg.version,
        main: argv.output + '/' + pkg.name + '.js',
        ignore: [
            '.codeclimate.yml',
            '.gitignore',
            '.npmignore',
            '.travis.yml',
            'scripts'
        ]
    }, null, 2);

    return file('bower.json', json, {src: true})
        .pipe(gulp.dest('./'));
});

gulp.task('default', gulp.parallel('build'));