Added support to write modifiers to footswitch.

Reading modifiers is not yet supported. This will be supported in the
next commit.

src/key_operations.rs

@@ -276,13 +276,25 @@ static KEY_MAP : &[(&str, u8)] = &[
     ("<ff>"                , 0xff),
 ];
 
-enum Modifier {
+pub enum Modifier {
     Ctrl = 1,
     Shift = 2,
     Alt = 4,
     Win = 8,
 }
 
+impl Modifier {
+    pub fn value(modifier:&str) -> Option<Modifier> {
+        match modifier {
+            "ctrl" => Some(Modifier::Ctrl),
+            "shift" => Some(Modifier::Shift),
+            "alt" => Some(Modifier::Alt),
+            "win" => Some(Modifier::Win),
+            _ => None,
+        }
+    }
+}
+
 enum MouseButton {
     MouseLeft = 1,
     MouseRight = 2,

src/main.rs

@@ -138,8 +138,11 @@ fn main() {
                     "append_str" => {
                         pedals.set_string(ped_list[i] as usize, val_list[i].as_str());
                     }
+                    "append_mod" => {
+                        pedals.set_modifier(ped_list[i] as usize, val_list[i].as_str());
+                    }
                     _ => {
-                        error!("Unkonwn command!");
+                        error!("Unknown command!");
                     }
                 }
             }

src/pedal_operations.rs

@@ -220,6 +220,17 @@ impl Pedals {
         }
     }
 
+    pub fn set_modifier(& mut self, ped:usize, modifier:&str) {
+        let modifier = match key_operations::Modifier::value(modifier) {
+            Some(x) => x,
+            None => error!("Unkown modifier! Please use one of the following: ctrl, shift, alt, win."),
+        };
+
+        self.set_type(ped, Type::Key);
+
+        self.ped_data[ped].data[2] |= modifier as u8;
+    }
+
     pub fn print_string(&self, dev: & hidapi::HidDevice, response: & mut [u8]) -> Option<String> {
         let mut string = String::new();
         let mut len = response[0] - 2;