Support '~' in label repo (#1518)

* Support '~' in label repo

* ~ first to avoid regex range

* Everything but ~ is allowed as first letter

label/label.go

@@ -62,7 +62,8 @@ func New(repo, pkg, name string) Label {
 var NoLabel = Label{}
 
 var (
- labelRepoRegexp = regexp.MustCompile(`^@$|^[A-Za-z.-][A-Za-z0-9_.-]*$`)
+ // This was taken from https://github.com/bazelbuild/bazel/blob/71fb1e4188b01e582a308cfe4bcbf1c730eded1b/src/main/java/com/google/devtools/build/lib/cmdline/RepositoryName.java#L159C1-L164
+ labelRepoRegexp = regexp.MustCompile(`^@$|^[A-Za-z0-9_.-][A-Za-z0-9_.~-]*$`)
  labelPkgRegexp = regexp.MustCompile(`^[A-Za-z0-9/._@-]*$`)
  // This was taken from https://docs.bazel.build/versions/main/build-ref.html#name
  labelNameRegexp = regexp.MustCompile("^[A-Za-z0-9!%-@^_` \"#$&'()*-+,;<=>?\\[\\]{|}~/.]*$")

label/label_test.go

@@ -82,6 +82,8 @@ func TestParse(t *testing.T) {
  {str: "@go_sdk//:src/cmd/go/testdata/mod/rsc.io_!q!u!o!t!e_v1.5.2.txt", want: Label{Repo: "go_sdk", Name: "src/cmd/go/testdata/mod/rsc.io_!q!u!o!t!e_v1.5.2.txt"}},
  {str: "//:a][b", want: Label{Name: "a][b"}},
  {str: "//:a b", want: Label{Name: "a b"}},
+ {str: "@rules_python~0.0.0~pip~name_dep//:_pkg", want: Label{Repo: "rules_python~0.0.0~pip~name_dep", Name: "_pkg"}},
+ {str: "@rules_python~0.0.0~pip~name//:dep_pkg", want: Label{Repo: "rules_python~0.0.0~pip~name", Name: "dep_pkg"}},
  } {
  got, err := Parse(tc.str)
  if err != nil && !tc.wantErr {