fix: Fix terraform_wrapper_module_for_each hook heredoc vars defaults (antonbabenko#554)

Author: ajax-ryzhyi-r

hooks/terraform_wrapper_module_for_each.sh

@@ -323,11 +323,11 @@ EOF
 
     # Get names of module variables in all terraform files
     # shellcheck disable=SC2207
-    module_vars=($(echo "$all_tf_content" | hcledit block list | { grep variable. || true; } | cut -d'.' -f 2))
+    module_vars=($(echo "$all_tf_content" | hcledit block list | { grep variable. | cut -d'.' -f 2 || true; }))
 
     # Get names of module outputs in all terraform files
     # shellcheck disable=SC2207
-    module_outputs=($(echo "$all_tf_content" | hcledit block list | { grep output. || true; } | cut -d'.' -f 2))
+    module_outputs=($(echo "$all_tf_content" | hcledit block list | { grep output. | cut -d'.' -f 2 || true; }))
 
     # Looking for sensitive output
     local wrapper_output_sensitive="# sensitive = false # No sensitive module output found"
@@ -360,6 +360,13 @@ EOF
         # https://github.com/terraform-aws-modules/terraform-aws-security-group/blob/0bd31aa88339194efff470d3b3f58705bd008db0/rules.tf#L8
         # As a result, wrappers in terraform-aws-security-group module are missing values of the rules variable and is not useful. :(
         var_value="try(each.value.${module_var}, var.defaults.${module_var}, {})"
+      elif [[ $var_default == \<\<* ]]; then
+        # Heredoc style default values produce HCL parsing error:
+        # 'Unterminated template string; No closing marker was found for the string.'
+        # Because closing marker must be alone on it's own line:
+        # https://developer.hashicorp.com/terraform/language/expressions/strings#heredoc-strings
+        var_value="try(each.value.${module_var}, var.defaults.${module_var}, $var_default
+          )"
       else
         var_value="try(each.value.${module_var}, var.defaults.${module_var}, $var_default)"
       fi