feat(checksum): extract file processing into a separate function

src/uucore/src/lib/features/checksum.rs

@@ -92,6 +92,25 @@ impl From<ChecksumError> for LineCheckError {
     }
 }
 
+#[allow(clippy::enum_variant_names)]
+enum FileCheckError {
+    UError(Box<dyn UError>),
+    NonCriticalError,
+    CriticalError,
+}
+
+impl From<Box<dyn UError>> for FileCheckError {
+    fn from(value: Box<dyn UError>) -> Self {
+        Self::UError(value)
+    }
+}
+
+impl From<ChecksumError> for FileCheckError {
+    fn from(value: ChecksumError) -> Self {
+        Self::UError(Box::new(value))
+    }
+}
+
 /// This struct regroups CLI flags.
 #[derive(Debug, Default, Clone, Copy)]
 pub struct ChecksumOptions {
@@ -656,20 +675,12 @@ fn process_checksum_line(
     Ok(())
 }
 
-/***
- * Do the checksum validation (can be strict or not)
-*/
-pub fn perform_checksum_validation<'a, I>(
-    files: I,
-    algo_name_input: Option<&str>,
-    length_input: Option<usize>,
+fn process_checksum_file(
+    filename_input: &OsStr,
+    cli_algo_name: Option<&str>,
+    cli_algo_length: Option<usize>,
     opts: ChecksumOptions,
-) -> UResult<()>
-where
-    I: Iterator<Item = &'a OsStr>,
-{
-    // if cksum has several input files, it will print the result for each file
-    for filename_input in files {
+) -> Result<(), FileCheckError> {
     let mut correct_format = 0;
     let mut properly_formatted = false;
     let mut res = ChecksumResult::default();
@@ -685,7 +696,7 @@ where
                 // Could not read the file, show the error and continue to the next file
                 show_error!("{e}");
                 set_exit_code(1);
-                    continue;
+                return Err(FileCheckError::NonCriticalError);
             }
         }
     };
@@ -699,7 +710,7 @@ where
         };
         show_error!("{e}");
         set_exit_code(1);
-            continue;
+        return Err(FileCheckError::NonCriticalError);
     };
 
     for (i, line) in lines.iter().enumerate() {
@@ -710,14 +721,14 @@ where
             &chosen_regex,
             is_algo_based_format,
             &mut res,
-                algo_name_input,
-                length_input,
+            cli_algo_name,
+            cli_algo_length,
             &mut properly_formatted,
             &mut correct_format,
             opts,
         ) {
             Ok(_) => (),
-                Err(LineCheckError::UError(e)) => return Err(e),
+            Err(LineCheckError::UError(e)) => return Err(e.into()),
         };
     }
 
@@ -731,8 +742,7 @@ where
             .into());
         }
         set_exit_code(1);
-
-            return Ok(());
+        return Err(FileCheckError::CriticalError);
     }
 
     // if any incorrectly formatted line, show it
@@ -759,6 +769,30 @@ where
     if (res.failed_cksum > 0 || res.failed_open_file > 0) && !opts.ignore_missing {
         set_exit_code(1);
     }
+
+    Ok(())
+}
+
+/***
+ * Do the checksum validation (can be strict or not)
+*/
+pub fn perform_checksum_validation<'a, I>(
+    files: I,
+    algo_name_input: Option<&str>,
+    length_input: Option<usize>,
+    opts: ChecksumOptions,
+) -> UResult<()>
+where
+    I: Iterator<Item = &'a OsStr>,
+{
+    // if cksum has several input files, it will print the result for each file
+    for filename_input in files {
+        use FileCheckError::*;
+        match process_checksum_file(filename_input, algo_name_input, length_input, opts) {
+            Err(UError(e)) => return Err(e),
+            Err(CriticalError) => break,
+            Err(NonCriticalError) | Ok(_) => continue,
+        }
     }
 
     Ok(())