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/* global module:false */
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module.exports = function(grunt) {
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	var port = grunt.option('port') || 8000;
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	var root = grunt.option('root') || '.';
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	if (!Array.isArray(root)) root = [root];
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	// Project configuration
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	grunt.initConfig({
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		pkg: grunt.file.readJSON('package.json'),
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		meta: {
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			banner:
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				'/*!\n' +
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				' * reveal.js <%= pkg.version %> (<%= grunt.template.today("yyyy-mm-dd, HH:MM") %>)\n' +
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				' * http://revealjs.com\n' +
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				' * MIT licensed\n' +
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				' *\n' +
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				' * Copyright (C) 2017 Hakim El Hattab, http://hakim.se\n' +
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				' */'
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		},
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		qunit: {
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			files: [ 'test/*.html' ]
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		},
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		uglify: {
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			options: {
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				banner: '<%= meta.banner %>\n',
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				screwIE8: false
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			},
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			build: {
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				src: 'js/reveal.js',
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				dest: 'js/reveal.min.js'
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			}
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		},
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		sass: {
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			core: {
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				src: 'css/reveal.scss',
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				dest: 'css/reveal.css'
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			},
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			themes: {
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				expand: true,
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				cwd: 'css/theme/source',
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				src: ['*.sass', '*.scss'],
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				dest: 'css/theme',
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				ext: '.css'
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			}
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		},
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		autoprefixer: {
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			core: {
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				src: 'css/reveal.css'
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			}
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		},
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		cssmin: {
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			options: {
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				compatibility: 'ie9'
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			},
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			compress: {
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				src: 'css/reveal.css',
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				dest: 'css/reveal.min.css'
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			}
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		},
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		jshint: {
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			options: {
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				curly: false,
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				eqeqeq: true,
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				immed: true,
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				esnext: true,
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				latedef: 'nofunc',
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				newcap: true,
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				noarg: true,
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				sub: true,
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				undef: true,
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				eqnull: true,
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				browser: true,
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				expr: true,
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				globals: {
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					head: false,
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					module: false,
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					console: false,
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					unescape: false,
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					define: false,
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					exports: false
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				}
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			},
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			files: [ 'Gruntfile.js', 'js/reveal.js' ]
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		},
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		connect: {
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			server: {
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				options: {
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					port: port,
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					base: root,
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					livereload: true,
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					open: true,
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					useAvailablePort: true
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				}
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			}
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		},
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		zip: {
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			bundle: {
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				src: [
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					'index.html',
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					'css/**',
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					'js/**',
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					'lib/**',
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					'images/**',
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					'plugin/**',
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					'**.md'
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				],
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				dest: 'reveal-js-presentation.zip'
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			}
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		},
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		watch: {
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			js: {
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				files: [ 'Gruntfile.js', 'js/reveal.js' ],
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				tasks: 'js'
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			},
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			theme: {
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				files: [
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					'css/theme/source/*.sass',
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					'css/theme/source/*.scss',
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					'css/theme/template/*.sass',
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					'css/theme/template/*.scss'
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				],
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				tasks: 'css-themes'
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			},
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			css: {
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				files: [ 'css/reveal.scss' ],
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				tasks: 'css-core'
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			},
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			html: {
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				files: root.map(path => path + '/*.html')
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			},
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			markdown: {
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				files: root.map(path => path + '/*.md')
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			},
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			options: {
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				livereload: true
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			}
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		},
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		retire: {
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			js: [ 'js/reveal.js', 'lib/js/*.js', 'plugin/**/*.js' ],
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			node: [ '.' ]
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		}
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	});
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	// Dependencies
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	grunt.loadNpmTasks( 'grunt-contrib-connect' );
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	grunt.loadNpmTasks( 'grunt-contrib-cssmin' );
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	grunt.loadNpmTasks( 'grunt-contrib-jshint' );
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	grunt.loadNpmTasks( 'grunt-contrib-qunit' );
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	grunt.loadNpmTasks( 'grunt-contrib-uglify' );
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	grunt.loadNpmTasks( 'grunt-contrib-watch' );
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	grunt.loadNpmTasks( 'grunt-autoprefixer' );
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	grunt.loadNpmTasks( 'grunt-retire' );
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	grunt.loadNpmTasks( 'grunt-sass' );
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	grunt.loadNpmTasks( 'grunt-zip' );
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	// Default task
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	grunt.registerTask( 'default', [ 'css', 'js' ] );
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	// JS task
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	grunt.registerTask( 'js', [ 'jshint', 'uglify', 'qunit' ] );
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	// Theme CSS
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	grunt.registerTask( 'css-themes', [ 'sass:themes' ] );
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	// Core framework CSS
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	grunt.registerTask( 'css-core', [ 'sass:core', 'autoprefixer', 'cssmin' ] );
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	// All CSS
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	grunt.registerTask( 'css', [ 'sass', 'autoprefixer', 'cssmin' ] );
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	// Package presentation to archive
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	grunt.registerTask( 'package', [ 'default', 'zip' ] );
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	// Serve presentation locally
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	grunt.registerTask( 'serve', [ 'connect', 'watch' ] );
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	// Run tests
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	grunt.registerTask( 'test', [ 'jshint', 'qunit' ] );
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};
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