add contributor list to each document

v2/lib/load/docs/metadata.js

@@ -1,6 +1,7 @@
 const fs = require('fs-extra');
 const path = require('path');
 const {getSubFolder, idx, parse} = require('../utils');
+const execSync = require("child_process").execSync;
 
 function getLanguage(filepath, refDir, env) {
   const translationEnabled = idx(env, ['translation', 'enabled']);
@@ -60,6 +61,32 @@ module.exports = async function processMetadata(
     metadata.title = metadata.id;
   }
 
+  /* set metadata author */
+  const authorRegex = /(\d+) author (.+)$/g;
+  const results = execSync(
+    `git blame --line-porcelain ${filepath} \
+    | grep -I "^author " | sort | uniq -c | sort -nr; \
+  `
+  ).toString().split('\n');
+  let authorData;
+  const authors = [];
+  let totalLineCount = 0;
+  results.forEach(result => {
+    if ((authorData = authorRegex.exec(result)) !== null) {
+      const lineCount = parseInt(authorData[1]);
+      const name = authorData[2];
+      authors.push({
+        lineCount,
+        name,
+      });
+      totalLineCount += lineCount;
+    }
+    authorRegex.lastIndex = 0;
+  });
+
+  metadata.authors = authors;
+  metadata.totalLineCount = totalLineCount;
+
   /* language */
   const language = getLanguage(filepath, refDir, env);
   metadata.language = language;

v2/lib/theme/Docs/index.js

@@ -73,7 +73,23 @@ export default class Docs extends React.Component {
               </Link>
             )}
         </div>
-        <div className={styles.mainContainer}>{this.props.children}</div>
+        <div className={styles.mainContainer}>
+          {this.props.children}
+          {metadata &&
+            metadata.authors &&
+            metadata.totalLineCount && (
+              <div className={styles.authorList}>
+                {metadata.authors
+                  .map(({name, lineCount}) => {
+                    const contribution =
+                      ((lineCount / metadata.totalLineCount) * 100).toFixed(2) +
+                      '%';
+                    return `${name} (${contribution})`;
+                  })
+                  .join(', ')}
+              </div>
+            )}
+        </div>
       </Layout>
     );
   }

v2/lib/theme/Docs/styles.css

@@ -8,3 +8,7 @@
   margin-right: auto;
   justify-content: center;
 }
+.authorList {
+  min-width: 100%;
+  text-align: center;
+}