fix: convert invalid recipe variable name to raw content (#3420)

crates/goose-cli/src/recipes/template_recipe.rs

@@ -12,6 +12,77 @@ use crate::recipes::recipe::BUILT_IN_RECIPE_DIR_PARAM;
 
 const CURRENT_TEMPLATE_NAME: &str = "current_template";
 
+fn preprocess_template_variables(content: &str) -> Result<String> {
+    let all_template_variables = extract_template_variables(content);
+    let complex_template_variables = filter_complex_variables(&all_template_variables);
+    let unparsable_template_variables = filter_unparseable_variables(&complex_template_variables)?;
+    replace_unparseable_vars_with_raw(content, &unparsable_template_variables)
+}
+
+fn extract_template_variables(content: &str) -> Vec<String> {
+    let template_var_re = Regex::new(r"\{\{(.*?)\}\}").unwrap();
+    template_var_re
+        .captures_iter(content)
+        .map(|cap| cap[1].to_string())
+        .collect()
+}
+
+fn filter_complex_variables(template_variables: &[String]) -> Vec<String> {
+    let valid_var_re = Regex::new(r"^\s*[a-zA-Z_][a-zA-Z0-9_]*\s*$").unwrap();
+    template_variables
+        .iter()
+        .filter(|var| !valid_var_re.is_match(var))
+        .cloned()
+        .collect()
+}
+
+fn filter_unparseable_variables(template_variables: &[String]) -> Result<Vec<String>> {
+    let mut vars_to_convert = Vec::new();
+
+    for var in template_variables {
+        // Create individual environment for each validation
+        let mut env = Environment::new();
+        env.set_undefined_behavior(UndefinedBehavior::Lenient);
+
+        let test_template = format!(
+            "{open}{content}{close}",
+            open = "{{",
+            content = var,
+            close = "}}"
+        );
+        if env.template_from_str(&test_template).is_err() {
+            vars_to_convert.push(var.clone());
+        }
+    }
+
+    Ok(vars_to_convert)
+}
+
+fn replace_unparseable_vars_with_raw(
+    content: &str,
+    unparsable_template_variables: &[String],
+) -> Result<String> {
+    let mut result = content.to_string();
+
+    for var in unparsable_template_variables {
+        let pattern = format!(
+            "{open}{content}{close}",
+            open = "{{",
+            content = var,
+            close = "}}"
+        );
+        let replacement = format!(
+            "{{% raw %}}{open}{content}{close}{{% endraw %}}",
+            open = "{{",
+            close = "}}",
+            content = var
+        );
+        result = result.replace(&pattern, &replacement);
+    }
+
+    Ok(result)
+}
+
 pub fn render_recipe_content_with_params(
     content: &str,
     params: &HashMap<String, String>,
@@ -19,10 +90,14 @@ pub fn render_recipe_content_with_params(
     // Pre-process content to replace empty double quotes with single quotes
     // This prevents MiniJinja from escaping "" to "\"\"" which would break YAML parsing
     let re = Regex::new(r#":\s*"""#).unwrap();
-    let processed_content = re.replace_all(content, ": ''");
+    let content_with_empty_quotes_replaced = re.replace_all(content, ": ''");
+
+    // Pre-process template variables to convert invalid variable names to raw content
+    let content_with_safe_variables =
+        preprocess_template_variables(&content_with_empty_quotes_replaced)?;
 
     let env = add_template_in_env(
-        &processed_content,
+        &content_with_safe_variables,
         params.get(BUILT_IN_RECIPE_DIR_PARAM).unwrap().clone(),
         UndefinedBehavior::Strict,
     )?;
@@ -37,9 +112,11 @@ pub fn render_recipe_silent_when_variables_are_provided(
     content: &str,
     params: &HashMap<String, String>,
 ) -> Result<String> {
+    let preprocessed_content = preprocess_template_variables(content)?;
+
     let mut env = minijinja::Environment::new();
     env.set_undefined_behavior(UndefinedBehavior::Lenient);
-    let template = env.template_from_str(content)?;
+    let template = env.template_from_str(&preprocessed_content)?;
     let rendered_content = template.render(params)?;
     Ok(rendered_content)
 }
@@ -87,8 +164,14 @@ pub fn parse_recipe_content(
     content: &str,
     recipe_dir: String,
 ) -> Result<(Recipe, HashSet<String>)> {
-    let (env, template_variables) =
+    // Pre-process template variables to handle invalid variable names
-        get_env_with_template_variables(content, recipe_dir, UndefinedBehavior::Lenient)?;
+    let preprocessed_content = preprocess_template_variables(content)?;
+
+    let (env, template_variables) = get_env_with_template_variables(
+        &preprocessed_content,
+        recipe_dir,
+        UndefinedBehavior::Lenient,
+    )?;
     let template = env.get_template(CURRENT_TEMPLATE_NAME).unwrap();
     let rendered_content = template
         .render(())
@@ -104,8 +187,14 @@ pub fn render_recipe_for_preview(
     recipe_dir: String,
     params: &HashMap<String, String>,
 ) -> Result<Recipe> {
-    let (env, template_variables) =
+    // Pre-process template variables to handle invalid variable names
-        get_env_with_template_variables(content, recipe_dir, UndefinedBehavior::Lenient)?;
+    let preprocessed_content = preprocess_template_variables(content)?;
+
+    let (env, template_variables) = get_env_with_template_variables(
+        &preprocessed_content,
+        recipe_dir,
+        UndefinedBehavior::Lenient,
+    )?;
     let template = env.get_template(CURRENT_TEMPLATE_NAME).unwrap();
     // if the variables are not provided, the template will be rendered with the variables, otherwise it will keep the variables as is
     let mut ctx = preserve_vars(&template_variables).clone();
@@ -175,6 +264,35 @@ mod tests {
             assert!(err.to_string().contains("unexpected end of input"));
         }
 
+        #[test]
+        fn test_render_content_with_spaced_variables() {
+            let content = "Hello {{hf model org}}_{{hf model name}}!";
+            let params = HashMap::from([("recipe_dir".to_string(), "some_dir".to_string())]);
+            let result = render_recipe_content_with_params(content, &params).unwrap();
+            assert_eq!(result, "Hello {{hf model org}}_{{hf model name}}!");
+
+            let content = "Hello {{hf model org}_{hf model name}}!";
+            let params = HashMap::from([("recipe_dir".to_string(), "some_dir".to_string())]);
+            let result = render_recipe_content_with_params(content, &params).unwrap();
+            assert_eq!(result, "Hello {{hf model org}_{hf model name}}!");
+
+            let content = "Hello {{valid_var}}!";
+            let params = HashMap::from([
+                ("recipe_dir".to_string(), "some_dir".to_string()),
+                ("valid_var".to_string(), "World".to_string()),
+            ]);
+            let result = render_recipe_content_with_params(content, &params).unwrap();
+            assert_eq!(result, "Hello World!");
+
+            let content = "{{valid_var}} and {{invalid var}}";
+            let params = HashMap::from([
+                ("recipe_dir".to_string(), "some_dir".to_string()),
+                ("valid_var".to_string(), "Hello".to_string()),
+            ]);
+            let result = render_recipe_content_with_params(content, &params).unwrap();
+            assert_eq!(result, "Hello and {{invalid var}}");
+        }
+
         #[test]
         fn test_empty_prompt() {
             let content = r#"