feat: origin filename support.

src/dry_run.rs

@@ -20,6 +20,11 @@ impl ShellScript {
         self.lines.push(format!("{}=\"{}\"", name, escaped));
     }
 
+    pub fn add_variable_str(&mut self, name: &str, value: &str) {
+        let escaped = value.replace('"', r#"\""#).replace('$', r#"\$"#);
+        self.lines.push(format!("{}=\"{}\"", name, escaped));
+    }
+
     pub fn add_command(&mut self, command: &str) {
         self.lines.push(command.to_string());
     }