Add trim option to shell extension and tests

src/extension/shell.rs

@@ -56,8 +56,20 @@ impl super::Extension for ShellExtension {
         match output {
             Ok(output) => {
                 let output_str = String::from_utf8_lossy(output.stdout.as_slice());
+                let mut output_str = output_str.into_owned();
 
-                Some(output_str.into_owned())
+                // If specified, trim the output
+                let trim_opt = params.get(&Value::from("trim"));
+                if let Some(value) = trim_opt {
+                    let val = value.as_bool();
+                    if let Some(val) = val {
+                        if val {
+                            output_str = output_str.trim().to_owned()
+                        }
+                    }
+                }
+
+                Some(output_str)
             },
             Err(e) => {
                 error!("Could not execute cmd '{}', error: {}", cmd, e);
@@ -66,3 +78,74 @@ impl super::Extension for ShellExtension {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::extension::Extension;
+
+    #[test]
+    fn test_shell_basic() {
+        let mut params = Mapping::new();
+        params.insert(Value::from("cmd"), Value::from("echo hello world"));
+
+        let extension = ShellExtension::new();
+        let output = extension.calculate(&params);
+
+        assert!(output.is_some());
+        assert_eq!(output.unwrap(), "hello world\n");
+    }
+
+    #[test]
+    fn test_shell_trimmed() {
+        let mut params = Mapping::new();
+        params.insert(Value::from("cmd"), Value::from("echo hello world"));
+        params.insert(Value::from("trim"), Value::from(true));
+
+        let extension = ShellExtension::new();
+        let output = extension.calculate(&params);
+
+        assert!(output.is_some());
+        assert_eq!(output.unwrap(), "hello world");
+    }
+
+    #[test]
+    fn test_shell_trimmed_2() {
+        let mut params = Mapping::new();
+        params.insert(Value::from("cmd"), Value::from("echo \"   hello world     \""));
+        params.insert(Value::from("trim"), Value::from(true));
+
+        let extension = ShellExtension::new();
+        let output = extension.calculate(&params);
+
+        assert!(output.is_some());
+        assert_eq!(output.unwrap(), "hello world");
+    }
+
+    #[test]
+    fn test_shell_trimmed_malformed() {
+        let mut params = Mapping::new();
+        params.insert(Value::from("cmd"), Value::from("echo hello world"));
+        params.insert(Value::from("trim"), Value::from("error"));
+
+        let extension = ShellExtension::new();
+        let output = extension.calculate(&params);
+
+        assert!(output.is_some());
+        assert_eq!(output.unwrap(), "hello world\n");
+    }
+
+    #[test]
+    #[cfg(not(target_os = "windows"))]
+    fn test_shell_pipes() {
+        let mut params = Mapping::new();
+        params.insert(Value::from("cmd"), Value::from("echo hello world | cat"));
+        params.insert(Value::from("trim"), Value::from(true));
+
+        let extension = ShellExtension::new();
+        let output = extension.calculate(&params);
+
+        assert!(output.is_some());
+        assert_eq!(output.unwrap(), "hello world");
+    }
+}