Get file explorer icon based on file type.

Fixes #15

src/gui/filesystem.rs

@@ -3,6 +3,7 @@
 // SPDX-License-Identifier: GNU General Public License v3.0 or later
 
 use cxx_qt_lib::{QModelIndex, QString};
+use devicons::FileIcon;
 use dirs;
 use log::warn;
 use std::fs;
@@ -52,6 +53,9 @@ pub mod qobject {
         #[qinvokable]
         #[cxx_name = "setDirectory"]
         fn set_directory(self: Pin<&mut FileSystem>, path: &QString) -> QModelIndex;
+
+        #[qinvokable]
+        fn icon(self: Pin<&mut FileSystem>, path: &QString) -> QString;
     }
 }
 
@@ -139,4 +143,15 @@ impl qobject::FileSystem {
             self.set_root_path(&QString::from(homedir))
         }
     }
+
+    fn icon(self: std::pin::Pin<&mut Self>, path: &QString) -> QString {
+        let str = path.to_string();
+        if Path::new(&str).is_dir() {
+            // Ensures directories are given a folder icon and not mistakenly resolved to a language.
+            // For example, a directory named `cpp` would otherwise return a C++ icon.
+            return QString::from(FileIcon::from("dir/").to_string())
+        }
+        let icon = FileIcon::from(str);
+        QString::from(icon.to_string())
+    }
 }