fix!: map unicode yen to KEY_YEN (#527)

This commit also allows "yen" to be overridden if desired.

docs/config.adoc

@@ -63,10 +63,11 @@ amount of whitespace (spaces, tabs, newlines) are not relevant. You may use
 spaces, tabs, or newlines however you like to visually format `defsrc` to your
 liking.
 
-The the primary source of all key names is the
-https://github.com/jtroo/kanata/blob/main/parser/src/keys/mod.rs[str_to_oscode]
-function in the source code. Please feel free to file an issue if you're unable
-to find the key you're looking for.
+The the primary source of all key names are the
+`str_to_oscode` and `default_mappings` functions in
+https://github.com/jtroo/kanata/blob/main/parser/src/keys/mod.rs[the source].
+Please feel welcome to file an issue
+if you're unable to find the key you're looking for.
 
 An example `defsrc` containing the US QWERTY keyboard keys as an
 approximately 60% keyboard layout:

parser/src/keys/mod.rs

@@ -66,6 +66,10 @@ fn add_default_str_osc_mappings(mapping: &mut HashMap<String, OsCode>) {
         (",", OsCode::KEY_COMMA),
         (".", OsCode::KEY_DOT),
         ("\\", OsCode::KEY_BACKSLASH),
+        // Mapped as backslash because in some locales/fonts, yen=backslash
+        ("yen", OsCode::KEY_BACKSLASH),
+        // Unicode yen is probably the yen key, so map this to a separate oscode by default.
+        ("¥", OsCode::KEY_YEN),
     ];
     for dm in default_mappings {
         mapping.entry(dm.0.into()).or_insert(dm.1);
@@ -109,7 +113,7 @@ pub fn str_to_oscode(s: &str) -> Option<OsCode> {
         "p" => OsCode::KEY_P,
         "lbrc" => OsCode::KEY_LEFTBRACE,
         "rbrc" => OsCode::KEY_RIGHTBRACE,
-        "bksl" | "yen" | "¥" => OsCode::KEY_BACKSLASH,
+        "bksl" => OsCode::KEY_BACKSLASH,
         "caps" => OsCode::KEY_CAPSLOCK,
         "a" => OsCode::KEY_A,
         "s" => OsCode::KEY_S,