Restructure modules

src/support/cmd.rs

@@ -0,0 +1,32 @@
+//! Helper functions for invoking system commands.
+
+
+use errors::*;
+use glib;
+use prefs::Prefs;
+use std::error::Error;
+use std;
+
+
+
+/// Execute an available volume control command asynchronously, starting with
+/// the preferences and using some fallback values. If none of these
+/// are valid executables in `$PATH`, then return `Err(err)`.
+pub fn execute_vol_control_command(prefs: &Prefs) -> Result<()> {
+    let m_cmd = prefs.get_avail_vol_control_cmd();
+
+    match m_cmd {
+        Some(ref cmd) => execute_command(cmd.as_str()),
+        None => bail!("No command found"),
+    }
+}
+
+
+/// Try to execute the given command asynchronously via gtk.
+pub fn execute_command(cmd: &str) -> Result<()> {
+    return glib::spawn_command_line_async(cmd)
+        .map_err(|e| {
+            std::io::Error::new(std::io::ErrorKind::Other, e.description())
+        })
+        .from_err();
+}