Skip non-file inputs when using --diff

src/config.rs

@@ -16,7 +16,7 @@ pub enum VisibleLines {
 }
 
 impl VisibleLines {
-    pub fn diff_context(&self) -> bool {
+    pub fn diff_mode(&self) -> bool {
         match self {
             Self::Ranges(_) => false,
             #[cfg(feature = "git")]

src/controller.rs

@@ -73,15 +73,15 @@ impl<'b> Controller<'b> {
                 }
                 Ok(mut opened_input) => {
                     #[cfg(feature = "git")]
-                    let line_changes = if self.config.visible_lines.diff_context()
+                    let line_changes = if self.config.visible_lines.diff_mode()
                         || (!self.config.loop_through && self.config.style_components.changes())
                     {
-                        if let crate::input::OpenedInputKind::OrdinaryFile(ref path) =
+                        match opened_input.kind {
-                            opened_input.kind
+                            crate::input::OpenedInputKind::OrdinaryFile(ref path) => {
-                        {
                                 let diff = get_git_diff(path);
 
-                            if self.config.visible_lines.diff_context()
+                                // Skip files without Git modifications
+                                if self.config.visible_lines.diff_mode()
                                     && diff
                                         .as_ref()
                                         .map(|changes| changes.is_empty())
@@ -91,8 +91,12 @@ impl<'b> Controller<'b> {
                                 }
 
                                 diff
-                        } else {
+                            }
-                            None
+                            _ if self.config.visible_lines.diff_mode() => {
+                                // Skip non-file inputs in diff mode
+                                continue;
+                            }
+                            _ => None,
                         }
                     } else {
                         None
@@ -134,7 +138,7 @@ impl<'b> Controller<'b> {
         printer: &mut dyn Printer,
         writer: &mut dyn Write,
         input: &mut OpenedInput,
-        #[cfg(feature = "git")] line_changes: &Option<LineChanges>,
+        line_changes: &Option<LineChanges>,
     ) -> Result<()> {
         if !input.reader.first_line.is_empty() || self.config.style_components.header() {
             printer.print_header(writer, input)?;

src/printer.rs

@@ -101,7 +101,7 @@ impl<'a> InteractivePrinter<'a> {
         config: &'a Config,
         assets: &'a HighlightingAssets,
         input: &mut OpenedInput,
-        #[cfg(feature = "git")] line_changes: &'a Option<LineChanges>,
+        line_changes: &'a Option<LineChanges>,
     ) -> Self {
         let theme = assets.get_theme(&config.theme);