Add extractor script

Also runs on Travis

scripts/extract.js

@@ -0,0 +1,68 @@
+/*
+  This is the extractor script that generates the snippets.json and snippetsArchive.json files.
+  Run using `npm run extractor`.
+*/
+// Load modules
+const fs = require('fs-extra');
+const path = require('path');
+const chalk = require('chalk');
+const util = require('./util');
+// Paths
+const SNIPPETS_PATH = './snippets';
+const SNIPPETS_ARCHIVE_PATH = './snippets_archive';
+const OUTPUT_PATH = './snippet_data';
+// Check if running on Travis - only build for cron jobs and custom builds
+if(util.isTravisCI() && process.env['TRAVIS_EVENT_TYPE'] !== 'cron' && process.env['TRAVIS_EVENT_TYPE'] !== 'api') {
+  console.log(`${chalk.green('NOBUILD')} snippet extraction terminated, not a cron or api build!`);
+  process.exit(0);
+}
+// Read data
+let snippets = {}, archivedSnippets = {}, tagDbData = {};
+console.time('Extractor');
+snippets = util.readSnippets(SNIPPETS_PATH);
+archivedSnippets = util.readSnippets(SNIPPETS_ARCHIVE_PATH);
+tagDbData = util.readTags();
+// Extract snippet data
+let snippetData = {
+  data: Object.keys(snippets).map(key => {
+    return {
+      id: key.slice(0,-3),
+      type: 'snippet',
+      attributes: {
+        fileName: key,
+        text: util.getTextualContent(snippets[key]).trim(),
+        codeBlocks: util.getCodeBlocks(snippets[key]).map(v => v.replace(/```js([\s\S]*?)```/g, '$1').trim()),
+        tags: tagDbData[key.slice(0,-3)]
+      },
+      meta: {
+        archived: false,
+        hash: util.hashData(snippets[key])
+      }
+    }
+  })
+};
+// Extract archived snippet data
+let snippetArchiveData = {
+  data: Object.keys(archivedSnippets).map(key => {
+    return {
+      id: key.slice(0,-3),
+      type: 'snippet',
+      attributes: {
+        fileName: key,
+        text: util.getTextualContent(archivedSnippets[key]).trim(),
+        codeBlocks: util.getCodeBlocks(archivedSnippets[key]).map(v => v.replace(/```js([\s\S]*?)```/g, '$1').trim()),
+        tags: []
+      },
+      meta: {
+        archived: true,
+        hash: util.hashData(archivedSnippets[key])
+      }
+    }
+  })
+};
+// Write files
+fs.writeFileSync(path.join(OUTPUT_PATH, 'snippets.json'), JSON.stringify(snippetData, null, 2));
+fs.writeFileSync(path.join(OUTPUT_PATH, 'snippetsArchive.json'), JSON.stringify(snippetArchiveData, null, 2));
+// Display messages and time
+console.log(`${chalk.green('SUCCESS!')} snippets.json and snippetsArchive.json files generated!`);
+console.timeEnd('Extractor');