cmd/parse: Move accidental pkg var to local var. (#7813)

This commit moves an accidental package-level definition of the `opa
parse` CLI subcommand to a local variable inside the `initParse`
function, similar to how we do command initialization for all other OPA
CLI subcommands.

Before this change, it was possible to see panics from the package
variable `cobra.Command` in `parse.go` having some of its flags redefined.
This fix makes it possible for `make generate-cli-docs` to run without
error again.

Signed-off-by: Philip Conrad <philip@chariot-chaser.net>

Author: philipaconrad

cmd/parse.go

@@ -46,28 +46,6 @@ var configuredParseParams = parseParams{
 	jsonInclude: "",
 }
 
-var parseCommand = &cobra.Command{
-	Use:   "parse <path>",
-	Short: "Parse Rego source file",
-	Long:  `Parse Rego source file and print AST.`,
-	PreRunE: func(cmd *cobra.Command, args []string) error {
-		if len(args) == 0 {
-			return errors.New("no source file specified")
-		}
-		return env.CmdFlags.CheckEnvironmentVariables(cmd)
-	},
-	RunE: func(cmd *cobra.Command, args []string) error {
-		cmd.SilenceErrors = true
-		cmd.SilenceUsage = true
-
-		exit := parse(args, &configuredParseParams, os.Stdout, os.Stderr)
-		if exit != 0 {
-			return newExitError(exit)
-		}
-		return nil
-	},
-}
-
 func parse(args []string, params *parseParams, stdout io.Writer, stderr io.Writer) int {
 	if len(args) == 0 {
 		return 0
@@ -140,6 +118,28 @@ func parse(args []string, params *parseParams, stdout io.Writer, stderr io.Write
 }
 
 func initParse(root *cobra.Command, _ string) {
+	parseCommand := &cobra.Command{
+		Use:   "parse <path>",
+		Short: "Parse Rego source file",
+		Long:  `Parse Rego source file and print AST.`,
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			if len(args) == 0 {
+				return errors.New("no source file specified")
+			}
+			return env.CmdFlags.CheckEnvironmentVariables(cmd)
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			cmd.SilenceErrors = true
+			cmd.SilenceUsage = true
+
+			exit := parse(args, &configuredParseParams, os.Stdout, os.Stderr)
+			if exit != 0 {
+				return newExitError(exit)
+			}
+			return nil
+		},
+	}
+
 	addOutputFormat(parseCommand.Flags(), configuredParseParams.format)
 	parseCommand.Flags().StringVarP(&configuredParseParams.jsonInclude, "json-include", "", "", "include or exclude optional elements. By default comments are included. Current options: locations, comments. E.g. --json-include locations,-comments will include locations and exclude comments.")
 	addV1CompatibleFlag(parseCommand.Flags(), &configuredParseParams.v1Compatible, false)