From c0cc79f9955dd1cd0aa46f88a4b2c49745fcf2c2 Mon Sep 17 00:00:00 2001
From: Fienny Angelina <fifi.angelina@yahoo.com>
Date: Tue, 25 Sep 2018 19:18:42 +0800
Subject: [PATCH] add contributor list to each document

---
 v2/lib/load/docs/metadata.js | 35 +++++++++++++++++++++++++++++++----
 v2/lib/theme/Docs/index.js   | 18 +++++++++++++++++-
 v2/lib/theme/Docs/styles.css |  6 +++++-
 3 files changed, 53 insertions(+), 6 deletions(-)

diff --git a/v2/lib/load/docs/metadata.js b/v2/lib/load/docs/metadata.js
index 4f147743c548..44d2fdb8d04e 100644
--- a/v2/lib/load/docs/metadata.js
+++ b/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 ${filepath} \
+    | grep -I "^author " | sort | uniq -c | sort -nr; \
+  `
+  ).toString().split('\n');
+  let authorData;
+  const authors = [];
+  let totalLineCount = 0;
+  results.forEach(result => {
+    if ((authorData = authorRegex.exec(result)) !== null) {
+      const lineCount = parseInt(authorData[1]);
+      const name = authorData[2];
+      authors.push({
+        lineCount,
+        name,
+      });
+      totalLineCount += lineCount;
+    }
+    authorRegex.lastIndex = 0;
+  });
+
+  metadata.authors = authors;
+  metadata.totalLineCount = totalLineCount;
+
   /* language */
   const language = getLanguage(filepath, refDir, env);
   metadata.language = language;
@@ -77,7 +104,7 @@ module.exports = async function processMetadata(
   const versionPart =
     (version && version !== latestVersion && `${version}/`) || '';
 
-  /* 
+  /*
     Convert temporarily metadata.id to the form of dirname/id without version/lang prefix
     ex: file `versioned_docs/version-1.0.0/en/foo/bar.md` with id `version-1.0.0-bar` => `foo/bar`
   */
@@ -105,16 +132,16 @@ module.exports = async function processMetadata(
     }
   }
 
-  /* 
+  /*
     The docs absolute file source
-    e.g: `/end/docs/hello.md` or `/end/website/versioned_docs/version-1.0.0/hello.md` 
+    e.g: `/end/docs/hello.md` or `/end/website/versioned_docs/version-1.0.0/hello.md`
   */
   metadata.source = path.join(refDir, source);
 
   /* Build the permalink */
   const {baseUrl, docsUrl} = siteConfig;
 
-  /* 
+  /*
     if user has own custom permalink defined in frontmatter
     e.g: :baseUrl:docsUrl/:langPart/:versionPart/endiliey/:id
   */
diff --git a/v2/lib/theme/Docs/index.js b/v2/lib/theme/Docs/index.js
index 3aff930ce506..733eb26ff869 100644
--- a/v2/lib/theme/Docs/index.js
+++ b/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>
     );
   }
diff --git a/v2/lib/theme/Docs/styles.css b/v2/lib/theme/Docs/styles.css
index 52f2cff1653c..d5c2782850b6 100644
--- a/v2/lib/theme/Docs/styles.css
+++ b/v2/lib/theme/Docs/styles.css
@@ -7,4 +7,8 @@
   margin-left: auto;
   margin-right: auto;
   justify-content: center;
-}
\ No newline at end of file
+}
+.authorList {
+  min-width: 100%;
+  text-align: center;
+}