Add selecting tags on the compare page (#15723)

* Add selecting tags on the compare page

* Remove unused condition and change indentation

* Fix tag tab in dropdown to be black

* Add compare tag integration test

Co-authored-by: Jonathan Tran <jon@allspice.io>

integrations/compare_test.go

@@ -0,0 +1,24 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package integrations
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCompareTag(t *testing.T) {
+	defer prepareTestEnv(t)()
+
+	session := loginUser(t, "user2")
+	req := NewRequest(t, "GET", "/user2/repo1/compare/v1.1...master")
+	resp := session.MakeRequest(t, req, http.StatusOK)
+	htmlDoc := NewHTMLParser(t, resp.Body)
+	selection := htmlDoc.doc.Find(".choose.branch .filter.dropdown")
+	// A dropdown for both base and head.
+	assert.Lenf(t, selection.Nodes, 2, "The template has changed")
+}

options/locale/locale_en-US.ini

@@ -1286,6 +1286,9 @@ issues.review.resolved_by = marked this conversation as resolved
 issues.assignee.error = Not all assignees was added due to an unexpected error.
 issues.reference_issue.body = Body
 
+compare.compare_base = base
+compare.compare_head = compare
+
 pulls.desc = Enable pull requests and code reviews.
 pulls.new = New Pull Request
 pulls.compare_changes = New Pull Request

routers/repo/compare.go

@@ -391,34 +391,36 @@ func ParseCompareInfo(ctx *context.Context) (*models.User, *models.Repository, *
 	if rootRepo != nil &&
 		rootRepo.ID != headRepo.ID &&
 		rootRepo.ID != baseRepo.ID {
-		perm, branches, err := getBranchesForRepo(ctx.User, rootRepo)
+		perm, branches, tags, err := getBranchesAndTagsForRepo(ctx.User, rootRepo)
 		if err != nil {
 			ctx.ServerError("GetBranchesForRepo", err)
 			return nil, nil, nil, nil, "", ""
 		}
 		if perm {
 			ctx.Data["RootRepo"] = rootRepo
 			ctx.Data["RootRepoBranches"] = branches
+			ctx.Data["RootRepoTags"] = tags
 		}
 	}
 
 	// If we have a ownForkRepo and it's different from:
 	// 1. The computed base
-	// 2. The computed hea
+	// 2. The computed head
 	// 3. The rootRepo (if we have one)
 	// then get the branches from it.
 	if ownForkRepo != nil &&
 		ownForkRepo.ID != headRepo.ID &&
 		ownForkRepo.ID != baseRepo.ID &&
 		(rootRepo == nil || ownForkRepo.ID != rootRepo.ID) {
-		perm, branches, err := getBranchesForRepo(ctx.User, ownForkRepo)
+		perm, branches, tags, err := getBranchesAndTagsForRepo(ctx.User, ownForkRepo)
 		if err != nil {
 			ctx.ServerError("GetBranchesForRepo", err)
 			return nil, nil, nil, nil, "", ""
 		}
 		if perm {
 			ctx.Data["OwnForkRepo"] = ownForkRepo
 			ctx.Data["OwnForkRepoBranches"] = branches
+			ctx.Data["OwnForkRepoTags"] = tags
 		}
 	}
 
@@ -572,25 +574,29 @@ func PrepareCompareDiff(
 	return false
 }
 
-func getBranchesForRepo(user *models.User, repo *models.Repository) (bool, []string, error) {
+func getBranchesAndTagsForRepo(user *models.User, repo *models.Repository) (bool, []string, []string, error) {
 	perm, err := models.GetUserRepoPermission(repo, user)
 	if err != nil {
-		return false, nil, err
+		return false, nil, nil, err
 	}
 	if !perm.CanRead(models.UnitTypeCode) {
-		return false, nil, nil
+		return false, nil, nil, nil
 	}
 	gitRepo, err := git.OpenRepository(repo.RepoPath())
 	if err != nil {
-		return false, nil, err
+		return false, nil, nil, err
 	}
 	defer gitRepo.Close()
 
 	branches, _, err := gitRepo.GetBranches(0, 0)
 	if err != nil {
-		return false, nil, err
+		return false, nil, nil, err
 	}
-	return true, branches, nil
+	tags, err := gitRepo.GetTags()
+	if err != nil {
+		return false, nil, nil, err
+	}
+	return true, branches, tags, nil
 }
 
 // CompareDiff show different from one commit to another commit
@@ -608,14 +614,29 @@ func CompareDiff(ctx *context.Context) {
 		return
 	}
 
-	if ctx.Data["PageIsComparePull"] == true {
-		headBranches, _, err := headGitRepo.GetBranches(0, 0)
-		if err != nil {
-			ctx.ServerError("GetBranches", err)
-			return
-		}
-		ctx.Data["HeadBranches"] = headBranches
+	baseGitRepo := ctx.Repo.GitRepo
+	baseTags, err := baseGitRepo.GetTags()
+	if err != nil {
+		ctx.ServerError("GetTags", err)
+		return
+	}
+	ctx.Data["Tags"] = baseTags
 
+	headBranches, _, err := headGitRepo.GetBranches(0, 0)
+	if err != nil {
+		ctx.ServerError("GetBranches", err)
+		return
+	}
+	ctx.Data["HeadBranches"] = headBranches
+
+	headTags, err := headGitRepo.GetTags()
+	if err != nil {
+		ctx.ServerError("GetTags", err)
+		return
+	}
+	ctx.Data["HeadTags"] = headTags
+
+	if ctx.Data["PageIsComparePull"] == true {
 		pr, err := models.GetUnmergedPullRequest(headRepo.ID, ctx.Repo.Repository.ID, headBranch, baseBranch)
 		if err != nil {
 			if !models.IsErrPullRequestNotExist(err) {