Merge pull request #871 from neuronull/fix_654_stdin_filename

Implement --file-name<name> option

src/bin/bat/app.rs

@@ -136,6 +136,13 @@ impl App {
             }
         });
 
+        match self.matches.values_of("file-name") {
+            Some(filenames) if filenames.len() != files.len() => {
+                return Err(format!("{} {}", filenames.len(), files.len()).into());
+            }
+            _ => {}
+        }
+
         Ok(Config {
             true_color: is_truecolor_terminal(),
             language: self.matches.value_of("language").or_else(|| {
@@ -222,6 +229,10 @@ impl App {
                 .map(LineRanges::from)
                 .map(|lr| HighlightedLineRanges(lr))
                 .unwrap_or_default(),
+            filenames: self
+                .matches
+                .values_of("file-name")
+                .map(|values| values.collect()),
         })
     }
 

src/bin/bat/clap_app.rs

@@ -93,6 +93,18 @@ pub fn build_app(interactive_output: bool) -> ClapApp<'static, 'static> {
                      '--highlight-line 40:' highlights lines 40 to the end of the file"
                 ),
         )
+        .arg(
+            Arg::with_name("file-name")
+                .long("file-name")
+                .takes_value(true)
+                .number_of_values(1)
+                .multiple(true)
+                .value_name("name")
+                .help("Specify the name to display for a file.")
+                .long_help("Specify the name to display for a file. Useful when piping \
+                            data to bat from STDIN when bat does not otherwise know \
+                            the filename."),
+        )
         .arg(
             Arg::with_name("tabs")
                 .long("tabs")