add error GroupFileNotFound

crates/main/main.rs

@@ -28,15 +28,16 @@ fn main() -> ExitCode {
 
 /// Skip printing the error chain when searching packages yields no results,
 /// otherwise report error chain.
+#[allow(clippy::option_if_let_else)]
 fn handle_final_result(result: Result<()>) -> ExitCode {
     match result {
         Ok(_) => ExitCode::SUCCESS,
         Err(ref e) => {
-            let root_e = e.root_cause().downcast_ref();
-            match root_e {
-                Some(pacdef_core::Error::NoPackagesFound) => ExitCode::FAILURE,
-                Some(_) => result.context("unknown pacdef error type").report(),
-                None => result.report(),
+            if let Some(root_error) = e.root_cause().downcast_ref::<pacdef_core::Error>() {
+                eprintln!("{root_error}");
+                ExitCode::FAILURE
+            } else {
+                result.report()
             }
         }
     }

crates/pacdef_core/src/core.rs

@@ -340,7 +340,7 @@ fn get_group_file_paths_matching_args<'a>(
             Some(group) => {
                 result.push(group.path.as_path());
             }
-            None => bail!("group file {} not found", file),
+            None => bail!(crate::errors::Error::GroupFileNotFound(file.clone())),
         }
     }
 

crates/pacdef_core/src/errors.rs

@@ -9,6 +9,8 @@ pub enum Error {
     NoPackagesFound,
     /// Config file not found.
     ConfigFileNotFound,
+    /// Group file not found.
+    GroupFileNotFound(String),
 }
 
 impl Display for Error {
@@ -16,6 +18,7 @@ impl Display for Error {
         match self {
             Self::NoPackagesFound => f.write_str("no packages matching query"),
             Self::ConfigFileNotFound => f.write_str("config file not found"),
+            Self::GroupFileNotFound(name) => f.write_str(&format!("group file '{name}' not found")),
         }
     }
 }