Resolves #188, upgrade to Asciidoctor.js 1.5.6-rc.1

* Remove 'bestikk-opal-compiler' dependency (we now use 'opal-compiler' directly)
* Remove async dependency (not used anymore)
* Simplify build scripts and use ECMAScript 6 syntax
* Run the task examples on Travis
* The examples task does not run the task build anymore

.travis.yml

@@ -25,6 +25,7 @@ script:
 - npm install
 - bundle exec rake build:converter:opal
 - npm run build
+- npm run examples
 - npm test
 
 notifications:

npm/build.js

@@ -1,4 +1,39 @@
-var Builder = require('./builder.js');
-var builder = new Builder();
+const log = require('bestikk-log');
+const bfs = require('bestikk-fs');
+const CompilerModule = require('./compiler.js');
 
-builder.build();
+const clean = function () {
+  log.task('clean');
+  removeBuildDirSync(); // remove build directory
+};
+
+const removeBuildDirSync = function () {
+  log.debug('remove build directory');
+  bfs.removeSync('build');
+  bfs.mkdirsSync('build');
+};
+
+const compile = function () {
+  CompilerModule.compile();
+};
+
+const copyToDist = function () {
+  log.task('copy to dist/');
+  removeDistDirSync();
+  bfs.copySync('build/asciidoctor-reveal.js', 'dist/main.js');
+};
+
+const removeDistDirSync = function () {
+  log.debug('remove dist directory');
+  bfs.removeSync('dist');
+  bfs.mkdirsSync('dist');
+};
+
+if (process.env.SKIP_BUILD) {
+  log.info('SKIP_BUILD environment variable is true, skipping "build" task');
+  return;
+}
+
+clean();
+compile();
+copyToDist();

npm/compiler.js

@@ -0,0 +1,15 @@
+const fs = require('fs');
+const log = require('bestikk-log');
+const OpalBuilder = require('opal-compiler').Builder;
+
+module.exports.compile = function () {
+  log.task('compile');
+
+  const opalBuilder = OpalBuilder.create();
+  opalBuilder.appendPaths('lib');
+  opalBuilder.setCompilerOptions({dynamic_require_severity: 'ignore'});
+  const module = 'asciidoctor-revealjs';
+  log.debug(module);
+  const data = opalBuilder.build(module).toString();
+  fs.writeFileSync('build/asciidoctor-reveal.js', data, 'utf8');
+};

npm/examples.js

@@ -1,6 +1,29 @@
+const fs = require('fs');
+const path = require('path');
 const log = require('bestikk-log');
-const Builder = require('./builder.js');
-const builder = new Builder();
+
+const examplesDir = 'examples';
 
 log.task('examples');
-builder.examples();
+
+// Load asciidoctor.js and local asciidoctor-reveal.js
+const asciidoctor = require('asciidoctor.js')();
+require('../build/asciidoctor-reveal.js');
+
+// Convert *a* document using the reveal.js converter
+var attributes = {'revealjsdir': 'node_modules/reveal.js@'};
+var options = {safe: 'safe', backend: 'revealjs', attributes: attributes, to_dir: examplesDir};
+
+fs.readdir(examplesDir, (err, files) => {
+  files.forEach(function (filename) {
+    if (path.extname(filename) === '.adoc') {
+      try {
+        asciidoctor.convertFile(path.join(examplesDir, filename), options);
+        log.info(`Successfully converted ${filename}`);
+      }
+      catch (err) {
+        log.error(`Error converting ${filename}: ${err}`);
+      }
+    }
+  });
+});