Support for ignored-suffix CLI arguments (#1892)

src/bin/bat/app.rs

@@ -107,6 +107,12 @@ impl App {
 
         let mut syntax_mapping = SyntaxMapping::builtin();
 
+        if let Some(values) = self.matches.values_of("ignored-suffix") {
+            for suffix in values {
+                syntax_mapping.insert_ignored_suffix(suffix);
+            }
+        }
+
         if let Some(values) = self.matches.values_of("map-syntax") {
             for from_to in values {
                 let parts: Vec<_> = from_to.split(':').collect();

src/bin/bat/clap_app.rs

@@ -509,6 +509,18 @@ pub fn build_app(interactive_output: bool) -> ClapApp<'static, 'static> {
                 .hidden_short_help(true)
                 .help("Show diagnostic information for bug reports.")
         )
+        .arg(
+            Arg::with_name("ignored-suffix")
+                .number_of_values(1)
+                .multiple(true)
+                .takes_value(true)
+                .long("ignored-suffix")
+                .hidden_short_help(true)
+                .help(
+                    "Ignore extension. For example:\n  \
+                    'bat --ignored-suffix \".dev\" my_file.json.dev' will use JSON syntax, and ignore '.dev'"
+                )
+        )
         .help_message("Print this help message.")
         .version_message("Show version information.");