Change the L/R syntax from a prefix to a suffix

README.md

@@ -168,8 +168,8 @@ For the `MOD1-` part, the following prefixes can be used (also case-insensitive)
 * Windows: `SUPER-`, `WIN-`, `WINDOWS-`
 
 You can use multiple prefixes like `C-M-Shift-a`.
-You may also prefix them with `L` or `R` (case-insensitive) so that
-remapping is triggered only on a left or right modifier, e.g. `LCtrl-a`.
+You may also suffix them with `_L` or `_R` (case-insensitive) so that
+remapping is triggered only on a left or right modifier, e.g. `Ctrl_L-a`.
 
 ### application
 

src/config/key_press.rs

@@ -72,11 +72,11 @@ fn parse_modifier(modifier: &str) -> Option<(Modifier, ModifierState)> {
     // Everything is case-insensitive
     let mut modifier = &modifier.to_uppercase()[..];
     let mut modifier_state = ModifierState::Either;
-    if modifier.starts_with("L") {
-        modifier = remove_first_char(modifier);
+    if modifier.ends_with("_L") {
+        modifier = remove_suffix(modifier);
         modifier_state = ModifierState::Left;
-    } else if modifier.starts_with("R") {
-        modifier = remove_first_char(modifier);
+    } else if modifier.ends_with("_R") {
+        modifier = remove_suffix(modifier);
         modifier_state = ModifierState::Right;
     }
 
@@ -99,8 +99,9 @@ fn parse_modifier(modifier: &str) -> Option<(Modifier, ModifierState)> {
     }
 }
 
-fn remove_first_char(string: &str) -> &str {
+fn remove_suffix(string: &str) -> &str {
     let mut chars = string.chars();
-    chars.next();
+    chars.next_back();
+    chars.next_back();
     chars.as_str()
 }

src/config/tests.rs

@@ -66,9 +66,9 @@ fn test_keymap_lr_modifiers() {
     keymap:
       - name: Global
         remap:
-          LAlt-Enter: RCtrl-Enter
+          Alt_L-Enter: Ctrl_L-Enter
       - remap:
-          RM-S: LC-S
+          M_R-S: C_L-S
     "})
 }