v2: prepare to move

v2/lib/webpack/loader/markdown.js

@@ -0,0 +1,78 @@
+const {getOptions} = require('loader-utils');
+const fm = require('front-matter');
+
+module.exports = function(fileString) {
+  const options = getOptions(this);
+  const {
+    siteConfig,
+    versionedDir,
+    docsDir,
+    translatedDir,
+    sourceToMetadata
+  } = options;
+
+  /* Extract content of markdown (without frontmatter) */
+  const {body} = fm(fileString);
+
+  /* Determine the source dir. e.g: @docs, @translated_docs/ko and @versioned_docs/version-1.0.0 */
+  let sourceDir;
+  let thisSource = this.resourcePath;
+  if (thisSource.startsWith(translatedDir)) {
+    thisSource = thisSource.replace(translatedDir, '@translated_docs');
+    const {language, version} = sourceToMetadata[thisSource] || {};
+    if (language && version && version !== 'next') {
+      sourceDir = `@translated_docs/${language}/version-${version}`;
+    } else if (language && (!version || version === 'next')) {
+      sourceDir = `@translated_docs/${language}`;
+    }
+  } else if (thisSource.startsWith(versionedDir)) {
+    thisSource = thisSource.replace(versionedDir, '@versioned_docs');
+    const {version} = sourceToMetadata[thisSource] || {};
+    if (version) {
+      sourceDir = `@versioned_docs/version-${version}`;
+    }
+  } else if (thisSource.startsWith(docsDir)) {
+    sourceDir = `@docs`;
+  }
+
+  /* Replace internal markdown linking (except in fenced blocks) */
+  let content = body;
+  if (sourceDir) {
+    let fencedBlock = false;
+    const lines = body.split('\n').map(line => {
+      if (line.trim().startsWith('```')) {
+        fencedBlock = !fencedBlock;
+      }
+      if (fencedBlock) return line;
+
+      let modifiedLine = line;
+      const mdLinks = [];
+      const mdRegex = /(?:\]\()(?:\.\/)?([^'")\]\s>]+\.md)/g;
+      let match = mdRegex.exec(content);
+      while (match !== null) {
+        mdLinks.push(match[1]);
+        match = mdRegex.exec(content);
+      }
+      mdLinks.forEach(mdLink => {
+        const targetSource = `${sourceDir}/${mdLink}`;
+        const {permalink} = sourceToMetadata[targetSource] || {};
+        if (permalink) {
+          modifiedLine = modifiedLine.replace(mdLink, permalink);
+        }
+      });
+      return modifiedLine;
+    });
+    content = lines.join('\n');
+  }
+
+  /* Return a React component */
+  return (
+    `import React from 'react';\n` +
+    `import Markdown from '@theme/Markdown'\n` +
+    `export default () => (
+      <Markdown siteConfig={${JSON.stringify(siteConfig)}}>
+        {${JSON.stringify(content)}}
+      </Markdown>
+    );`
+  );
+};