Add experimental mode

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

3 files changed, 36 insertions, 0 deletions

diff --git a/cmd/gomplate/config.go b/cmd/gomplate/config.go
index 02278618..caaf4963 100644
--- a/cmd/gomplate/config.go
+++ b/cmd/gomplate/config.go
@@ -156,6 +156,10 @@ func cobraConfig(cmd *cobra.Command, args []string) (cfg *config.Config, err err
 	if err != nil {
 		return nil, err
 	}
+	cfg.Experimental, err = getBool(cmd, "experimental")
+	if err != nil {
+		return nil, err
+	}
 
 	cfg.LDelim, err = getString(cmd, "left-delim")
 	if err != nil {
@@ -249,5 +253,9 @@ func applyEnvVars(ctx context.Context, cfg *config.Config) (*config.Config, erro
 		cfg.SuppressEmpty = true
 	}
 
+	if !cfg.Experimental && conv.ToBool(env.Getenv("GOMPLATE_EXPERIMENTAL", "false")) {
+		cfg.Experimental = true
+	}
+
 	return cfg, nil
 }
diff --git a/cmd/gomplate/config_test.go b/cmd/gomplate/config_test.go
index 24178423..97b9a89f 100644
--- a/cmd/gomplate/config_test.go
+++ b/cmd/gomplate/config_test.go
@@ -233,6 +233,25 @@ func TestApplyEnvVars(t *testing.T) {
 			&config.Config{SuppressEmpty: true},
 			&config.Config{SuppressEmpty: true},
 		},
+
+		{
+			"GOMPLATE_EXPERIMENTAL", "bogus",
+			false,
+			&config.Config{},
+			&config.Config{Experimental: false},
+		},
+		{
+			"GOMPLATE_EXPERIMENTAL", "true",
+			false,
+			&config.Config{},
+			&config.Config{Experimental: true},
+		},
+		{
+			"GOMPLATE_EXPERIMENTAL", "false",
+			false,
+			&config.Config{Experimental: true},
+			&config.Config{Experimental: true},
+		},
 	}
 
 	for i, d := range data {
diff --git a/cmd/gomplate/main.go b/cmd/gomplate/main.go
index cbd3f744..ab52c630 100644
--- a/cmd/gomplate/main.go
+++ b/cmd/gomplate/main.go
@@ -78,6 +78,13 @@ func newGomplateCmd() *cobra.Command {
 			if err != nil {
 				return err
 			}
+			ctx = config.ContextWithConfig(ctx, cfg)
+			if cfg.Experimental {
+				log.UpdateContext(func(c zerolog.Context) zerolog.Context {
+					return c.Bool("experimental", true)
+				})
+				log.Info().Msg("experimental functions and features enabled!")
+			}
 
 			log.Debug().Msgf("starting %s", cmd.Name())
 			log.Debug().
@@ -135,6 +142,8 @@ func initFlags(command *cobra.Command) {
 	command.Flags().String("left-delim", ldDefault, "override the default left-`delimiter` [$GOMPLATE_LEFT_DELIM]")
 	command.Flags().String("right-delim", rdDefault, "override the default right-`delimiter` [$GOMPLATE_RIGHT_DELIM]")
 
+	command.Flags().Bool("experimental", false, "enable experimental features [$GOMPLATE_EXPERIMENTAL]")
+
 	command.Flags().BoolP("verbose", "V", false, "output extra information about what gomplate is doing")
 
 	command.Flags().String("config", defaultConfigFile, "config file (overridden by commandline flags)")