[hcledit/read] add flag to CLI command to control this behavior

cmd/hcledit/internal/command/fixture/file.tf

@@ -15,6 +15,9 @@ module "my-module" {
     "f",
   ]
 
+  unevaluateable_reference = var.name
+  unevaluateable_interpolation = "this-${local.reference}"
+
   map_variable = {
     bool_variable   = true
     int_variable    = 1

cmd/hcledit/internal/command/read.go

@@ -15,6 +15,7 @@ import (
 
 type ReadOptions struct {
 	OutputFormat string
+	Fallback     bool
 }
 
 func NewCmdRead() *cobra.Command {
@@ -36,6 +37,7 @@ func NewCmdRead() *cobra.Command {
 	}
 
 	cmd.Flags().StringVarP(&opts.OutputFormat, "output-format", "o", "go-template='{{.Value}}'", "format to print the value as")
+	cmd.Flags().BoolVar(&opts.Fallback, "fallback", false, "falls back to reading the raw value if it cannot be evaluated")
 
 	return cmd
 }
@@ -48,7 +50,11 @@ func runRead(opts *ReadOptions, args []string) (string, error) {
 		return "", fmt.Errorf("failed to read file: %s", err)
 	}
 
-	results, err := editor.Read(query)
+	readOpts:= []hcledit.Option{}
+	if opts.Fallback {
+		readOpts = append(readOpts, hcledit.WithReadFallbackToRawString())
+	}
+	results, err := editor.Read(query, readOpts...)
 	if err != nil {
 		return "", fmt.Errorf("failed to read file: %s", err)
 	}

cmd/hcledit/internal/command/read_test.go

@@ -95,6 +95,22 @@ func TestRunRead(t *testing.T) {
 			want:  "",
 			opts:  defaultOpts,
 		},
+		"unevaluateable reference fallback": {
+			query: "module.my-module.unevaluateable_reference",
+			want:  "var.name",
+			opts: &ReadOptions{
+				OutputFormat: "go-template='{{.Value}}'",
+				Fallback:     true,
+			},
+		},
+		"unevaluateable interpolation fallback": {
+			query: "module.my-module.unevaluateable_interpolation",
+			want:  `"this-${local.reference}"`,
+			opts: &ReadOptions{
+				OutputFormat: "go-template='{{.Value}}'",
+				Fallback:     true,
+			},
+		},
 	}
 
 	for name, tc := range cases {