Merge pull request #5374 from GreenRecycleBin/!$&'()+,;=@

generateCompareURL uses url.PathEscape instead of url.QueryEscape

pkg/cmd/pr/create/create.go

@@ -755,7 +755,7 @@ func generateCompareURL(ctx CreateContext, state shared.IssueMetadataState) (str
 	u := ghrepo.GenerateRepoURL(
 		ctx.BaseRepo,
 		"compare/%s...%s?expand=1",
-		url.QueryEscape(ctx.BaseBranch), url.QueryEscape(ctx.HeadBranchLabel))
+		url.PathEscape(ctx.BaseBranch), url.PathEscape(ctx.HeadBranchLabel))
 	url, err := shared.WithPrAndIssueQueryParams(ctx.Client, ctx.BaseRepo, u, state)
 	if err != nil {
 		return "", err

pkg/cmd/pr/create/create_test.go

@@ -989,13 +989,29 @@ func Test_generateCompareURL(t *testing.T) {
 			wantErr: false,
 		},
 		{
-			name: "complex branch names",
+			name: "'/'s in branch names/labels are percent-encoded",
 			ctx: CreateContext{
 				BaseRepo:        api.InitRepoHostname(&api.Repository{Name: "REPO", Owner: api.RepositoryOwner{Login: "OWNER"}}, "github.com"),
 				BaseBranch:      "main/trunk",
 				HeadBranchLabel: "owner:feature",
 			},
-			want:    "https://github.com/OWNER/REPO/compare/main%2Ftrunk...owner%3Afeature?body=&expand=1",
+			want:    "https://github.com/OWNER/REPO/compare/main%2Ftrunk...owner:feature?body=&expand=1",
+			wantErr: false,
+		},
+		{
+			name: "Any of !'(),; but none of $&+=@ and : in branch names/labels are percent-encoded ",
+			/*
+					- Technically, per section 3.3 of RFC 3986, none of !$&'()*+,;= (sub-delims) and :[]@ (part of gen-delims) in path segments are optionally percent-encoded, but url.PathEscape percent-encodes !'(),; anyway
+					- !$&'()+,;=@ is a valid Git branch name—essentially RFC 3986 sub-delims without * and gen-delims without :/?#[]
+					- : is GitHub separator between a fork name and a branch name
+				    - See https://github.com/golang/go/issues/27559.
+			*/
+			ctx: CreateContext{
+				BaseRepo:        api.InitRepoHostname(&api.Repository{Name: "REPO", Owner: api.RepositoryOwner{Login: "OWNER"}}, "github.com"),
+				BaseBranch:      "main/trunk",
+				HeadBranchLabel: "owner:!$&'()+,;=@",
+			},
+			want:    "https://github.com/OWNER/REPO/compare/main%2Ftrunk...owner:%21$&%27%28%29+%2C%3B=@?body=&expand=1",
 			wantErr: false,
 		},
 	}