make python conditional

gazelle/python/BUILD.bazel

@@ -0,0 +1,24 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+config_setting(
+    name = "windows",
+    constraint_values = ["@platforms//os:windows"],
+)
+
+go_library(
+    name = "python",
+    srcs = [
+        "unix.go",
+        "windows.go",
+    ],
+    importpath = "aspect.build/cli/gazelle/python",
+    visibility = ["//visibility:public"],
+    deps = [
+        "@bazel_gazelle//language:go_default_library",
+    ] + select({
+        ":windows": [],
+        "//conditions:default": [
+            "@com_github_bazelbuild_rules_python_gazelle//python",
+        ],
+    }),
+)

gazelle/python/unix.go

@@ -0,0 +1,13 @@
+//go:build linux || darwin
+// +build linux darwin
+
+package python
+
+import (
+	"github.com/bazelbuild/bazel-gazelle/language"
+	python "github.com/bazelbuild/rules_python/gazelle/python"
+)
+
+func NewLanguage() language.Language {
+	return python.NewLanguage()
+}

gazelle/python/windows.go

@@ -0,0 +1,15 @@
+//go:build windows
+// +build windows
+
+package python
+
+import (
+	"log"
+
+	"github.com/bazelbuild/bazel-gazelle/language"
+)
+
+func NewLanguage() language.Language {
+	log.Fatalln("Python extension is not supported on Windows.\nSee: https://github.com/aspect-build/aspect-cli/issues/747")
+	return nil
+}

pkg/aspect/configure/BUILD.bazel

@@ -18,6 +18,7 @@ go_library(
         "//gazelle/bzl",
         "//gazelle/js",
         "//gazelle/kotlin",
+        "//gazelle/python",
         "//pkg/aspect/configure/internal/wspace",
         "//pkg/aspecterrors",
         "//pkg/ioutils",
@@ -33,7 +34,6 @@ go_library(
         "@bazel_gazelle//rule:go_default_library",
         "@bazel_gazelle//walk:go_default_library",
         "@com_github_bazelbuild_buildtools//build:go_default_library",
-        # "@com_github_bazelbuild_rules_python_gazelle//python",
         "@com_github_pmezard_go_difflib//difflib",
         "@com_github_spf13_cobra//:cobra",
         "@com_github_spf13_viper//:viper",

pkg/aspect/configure/configure.go

@@ -26,12 +26,12 @@ import (
 	bzl "aspect.build/cli/gazelle/bzl"
 	js "aspect.build/cli/gazelle/js"
 	kotlin "aspect.build/cli/gazelle/kotlin"
+	python "aspect.build/cli/gazelle/python"
 	"aspect.build/cli/pkg/aspecterrors"
 	"aspect.build/cli/pkg/ioutils"
 	"github.com/bazelbuild/bazel-gazelle/language"
 	golang "github.com/bazelbuild/bazel-gazelle/language/go"
 	"github.com/bazelbuild/bazel-gazelle/language/proto"
-	// python "github.com/bazelbuild/rules_python/gazelle/python"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 )
@@ -93,10 +93,10 @@ func (c *Configure) addDefaultLanguages() {
 		c.AddLanguage("bzl", bzl.NewLanguage)
 	}
 
-	// viper.SetDefault("configure.languages.python", false)
-	// if viper.GetBool("configure.languages.python") {
-	// 	c.AddLanguage("python", python.NewLanguage)
-	// }
+	viper.SetDefault("configure.languages.python", false)
+	if viper.GetBool("configure.languages.python") {
+		c.AddLanguage("python", python.NewLanguage)
+	}
 }
 
 func (runner *Configure) Run(_ context.Context, cmd *cobra.Command, args []string) error {