feat(pypi): changelog lookup in project_urls (#6421)

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

lib/datasource/pypi/__snapshots__/index.spec.ts.snap

 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`datasource/pypi getReleases find url from project_urls 1`] = `
+Object {
+  "changelogUrl": "https://github.com/Flexget/wiki/blob/master/ChangeLog.md",
+  "homepage": "https://flexget.com",
+  "releases": Array [],
+  "sourceUrl": "https://github.com/Flexget/Flexget",
+}
+`;
+
 exports[`datasource/pypi getReleases process data from +simple endpoint 1`] = `
 Object {
   "releases": Array [
@@ -206,14 +215,6 @@ Object {
 }
 `;
 
-exports[`datasource/pypi getReleases return sourceUrl in project_urls 1`] = `
-Object {
-  "homepage": "https://flexget.com",
-  "releases": Array [],
-  "sourceUrl": "https://github.com/Flexget/Flexget",
-}
-`;
-
 exports[`datasource/pypi getReleases returns non-github home_page 1`] = `
 Object {
   "homepage": "https://microsoft.com",

lib/datasource/pypi/index.spec.ts

@@ -122,25 +122,28 @@ describe('datasource/pypi', () => {
         })
       ).toMatchSnapshot();
     });
-    it('return sourceUrl in project_urls', async () => {
-      got.mockReturnValueOnce({
-        body: {
-          info: {
+    it('find url from project_urls', async () => {
+      const info = {
         name: 'flexget',
         home_page: 'https://flexget.com',
         project_urls: {
           Forum: 'https://discuss.flexget.com',
           Homepage: 'https://flexget.com',
+          changelog: 'https://github.com/Flexget/wiki/blob/master/ChangeLog.md',
           'Issue Tracker': 'https://github.com/Flexget/Flexget/issues',
           Repository: 'https://github.com/Flexget/Flexget',
         },
-          },
+      };
+      got.mockReturnValueOnce({
+        body: {
+          info,
         },
       });
       const result = await pypi.getReleases({
         lookupName: 'flexget',
       });
-      expect(result.sourceUrl).toBe('https://github.com/Flexget/Flexget');
+      expect(result.sourceUrl).toBe(info.project_urls.Repository);
+      expect(result.changelogUrl).toBe(info.project_urls.changelog);
       expect(result).toMatchSnapshot();
     });
     it('returns null if mismatched name', async () => {

lib/datasource/pypi/index.ts

 import url from 'url';
 import is from '@sindresorhus/is';
+import changelogFilenameRegex from 'changelog-filename-regex';
 import { parse } from 'node-html-parser';
 import { logger } from '../../logger';
 import { Http } from '../../util/http';
@@ -83,17 +84,34 @@ async function getDependency(
       }
     }
 
-    if (dep.info?.project_urls && !dependency.sourceUrl) {
+    if (dep.info?.project_urls) {
       for (const [name, projectUrl] of Object.entries(dep.info.project_urls)) {
         const lower = name.toLowerCase();
+
         if (
-          lower.startsWith('repo') ||
+          !dependency.sourceUrl &&
+          (lower.startsWith('repo') ||
             lower === 'code' ||
             lower === 'source' ||
-          github_repo_pattern.exec(projectUrl)
+            github_repo_pattern.exec(projectUrl))
         ) {
           dependency.sourceUrl = projectUrl;
-          break;
+        }
+
+        if (
+          !dependency.changelogUrl &&
+          ([
+            'changelog',
+            'change log',
+            'changes',
+            'release notes',
+            'news',
+            "what's new",
+          ].includes(lower) ||
+            changelogFilenameRegex.exec(lower))
+        ) {
+          // from https://github.com/pypa/warehouse/blob/418c7511dc367fb410c71be139545d0134ccb0df/warehouse/templates/packaging/detail.html#L24
+          dependency.changelogUrl = projectUrl;
         }
       }
     }