Replace Input::stdin_as_file with bat-application functions

src/bin/bat/input.rs

@@ -0,0 +1,20 @@
+use bat::input::Input;
+use std::ffi::OsStr;
+
+pub fn new_file_input<'a>(file: &'a OsStr, name: Option<&'a OsStr>) -> Input<'a> {
+    named(Input::ordinary_file(file), name.or_else(|| Some(file)))
+}
+
+pub fn new_stdin_input(name: Option<&OsStr>) -> Input {
+    named(Input::stdin(), name)
+}
+
+fn named<'a>(input: Input<'a>, name: Option<&OsStr>) -> Input<'a> {
+    if let Some(provided_name) = name {
+        let mut input = input.with_name(Some(provided_name));
+        input.description_mut().set_kind(Some("File".to_owned()));
+        input
+    } else {
+        input
+    }
+}