fix(go): Improve go-import content parsing (#9022)

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

@@ -143,6 +143,56 @@ Array [
 ]
 `;
 
+exports[`datasource/go getReleases handles fyne.io 1`] = `
+Object {
+  "releases": Array [
+    Object {
+      "gitRef": "v1.0.0",
+      "version": "v1.0.0",
+    },
+    Object {
+      "gitRef": "v2.0.0",
+      "version": "v2.0.0",
+    },
+  ],
+  "sourceUrl": "https://github.com/fyne-io/fyne",
+}
+`;
+
+exports[`datasource/go getReleases handles fyne.io 2`] = `
+Array [
+  Object {
+    "headers": Object {
+      "accept-encoding": "gzip, deflate",
+      "host": "fyne.io",
+      "user-agent": "https://github.com/renovatebot/renovate",
+    },
+    "method": "GET",
+    "url": "https://fyne.io/fyne?go-get=1",
+  },
+  Object {
+    "headers": Object {
+      "accept": "application/vnd.github.v3+json",
+      "accept-encoding": "gzip, deflate",
+      "host": "api.github.com",
+      "user-agent": "https://github.com/renovatebot/renovate",
+    },
+    "method": "GET",
+    "url": "https://api.github.com/repos/fyne-io/fyne/tags?per_page=100",
+  },
+  Object {
+    "headers": Object {
+      "accept": "application/vnd.github.v3+json",
+      "accept-encoding": "gzip, deflate",
+      "host": "api.github.com",
+      "user-agent": "https://github.com/renovatebot/renovate",
+    },
+    "method": "GET",
+    "url": "https://api.github.com/repos/fyne-io/fyne/releases?per_page=100",
+  },
+]
+`;
+
 exports[`datasource/go getReleases processes real data 1`] = `
 Object {
   "releases": Array [

lib/datasource/go/index.spec.ts

@@ -445,5 +445,28 @@ describe('datasource/go', () => {
       expect(httpCalls).toMatchSnapshot();
       httpMock.reset();
     });
+    it('handles fyne.io', async () => {
+      httpMock
+        .scope('https://fyne.io/')
+        .get('/fyne?go-get=1')
+        .reply(
+          200,
+          '<meta name="go-import" content="fyne.io/fyne git https://github.com/fyne-io/fyne">'
+        );
+      httpMock
+        .scope('https://api.github.com/')
+        .get('/repos/fyne-io/fyne/tags?per_page=100')
+        .reply(200, [{ name: 'v1.0.0' }, { name: 'v2.0.0' }])
+        .get('/repos/fyne-io/fyne/releases?per_page=100')
+        .reply(200, []);
+      const res = await getPkgReleases({
+        datasource,
+        depName: 'fyne.io/fyne',
+      });
+      expect(res).toMatchSnapshot();
+      expect(res).not.toBeNull();
+      expect(res).toBeDefined();
+      expect(httpMock.getTrace()).toMatchSnapshot();
+    });
   });
 });

lib/datasource/go/index.ts

@@ -4,6 +4,7 @@ import { logger } from '../../logger';
 import * as hostRules from '../../util/host-rules';
 import { Http } from '../../util/http';
 import { regEx } from '../../util/regex';
+import { trimTrailingSlash } from '../../util/url';
 import * as bitbucket from '../bitbucket-tags';
 import * as github from '../github-tags';
 import * as gitlab from '../gitlab-tags';
@@ -115,8 +116,11 @@ async function getDatasource(goModule: string): Promise<DataSource | null> {
       const parsedUrl = URL.parse(goImportURL);
 
       // split the go module from the URL: host/go/module -> go/module
-      const split = goModule.split('/');
-      const lookupName = split[1] + '/' + split[2];
+      const lookupName = trimTrailingSlash(parsedUrl.pathname)
+        .replace(/\.git$/, '')
+        .split('/')
+        .slice(-2)
+        .join('/');
 
       return {
         datasource: github.id,

lib/util/url.spec.ts

@@ -1,4 +1,4 @@
-import { resolveBaseUrl, validateUrl } from './url';
+import { resolveBaseUrl, trimTrailingSlash, validateUrl } from './url';
 
 describe('util/url', () => {
   test.each([
@@ -53,4 +53,10 @@ describe('util/url', () => {
     expect(validateUrl('http://github.com')).toBe(true);
     expect(validateUrl('https://github.com')).toBe(true);
   });
+  it('trimTrailingSlash', () => {
+    expect(trimTrailingSlash('foo')).toBe('foo');
+    expect(trimTrailingSlash('/foo/bar')).toBe('/foo/bar');
+    expect(trimTrailingSlash('foo/')).toBe('foo');
+    expect(trimTrailingSlash('foo//////')).toBe('foo');
+  });
 });

lib/util/url.ts

@@ -4,6 +4,10 @@ export function ensureTrailingSlash(url: string): string {
   return url.replace(/\/?$/, '/');
 }
 
+export function trimTrailingSlash(url: string): string {
+  return url.replace(/\/+$/, '');
+}
+
 export function resolveBaseUrl(baseUrl: string, input: string | URL): string {
   const inputString = input.toString();