Add mounter abstraction, enable minimal GVfs support

src/mounter/gvfs.rs

@@ -0,0 +1,54 @@
+use cosmic::widget;
+use gio::prelude::*;
+use gio::{Mount, ThemedIcon, Volume, VolumeMonitor};
+use std::{error::Error, path::PathBuf};
+
+use super::{Mounter, MounterItem, MounterItems};
+
+pub struct Gvfs {
+    monitor: VolumeMonitor,
+}
+
+impl Gvfs {
+    pub fn new() -> Self {
+        let monitor = VolumeMonitor::get();
+        Self { monitor }
+    }
+}
+
+impl Mounter for Gvfs {
+    fn items(&self) -> Result<MounterItems, Box<dyn Error>> {
+        let mut items = MounterItems::new();
+        for mount in self.monitor.mounts() {
+            items.push(Box::new(mount));
+        }
+        Ok(items)
+    }
+}
+
+impl MounterItem for Mount {
+    fn name(&self) -> String {
+        MountExt::name(self).to_string()
+    }
+
+    fn icon(&self, size: u16) -> widget::icon::Handle {
+        let icon = MountExt::symbolic_icon(self);
+        if let Some(themed_icon) = icon.downcast_ref::<ThemedIcon>() {
+            for name in themed_icon.names() {
+                let named = widget::icon::from_name(name.as_str()).size(size);
+                if let Some(path) = named.path() {
+                    return widget::icon::from_path(path);
+                }
+            }
+        }
+
+        //TODO: handle more gio icon types
+        widget::icon::from_name("folder-symbolic")
+            .size(size)
+            .handle()
+    }
+
+    fn path(&self) -> Option<PathBuf> {
+        MountExt::root(self).path()
+    }
+}