Added untested advanced keycode translation

backends/x/event.go

@@ -58,8 +58,8 @@ func (backend *Backend) handleKeyPress (
 	event xevent.KeyPressEvent,
 ) {
 	keyEvent := *event.KeyPressEvent
-	keysym   := backend.keycodeToKeysym(keyEvent.Detail)
-	backend.channel <- stone.EventPress(keysymToButtonCode(keysym))
+	button   := backend.keycodeToButton(keyEvent.Detail, keyEvent.State)
+	backend.channel <- stone.EventPress(button)
 }
 
 func (backend *Backend) handleKeyRelease (
@@ -67,8 +67,8 @@ func (backend *Backend) handleKeyRelease (
 	event xevent.KeyReleaseEvent,
 ) {
 	keyEvent := *event.KeyReleaseEvent
-	keysym   := backend.keycodeToKeysym(keyEvent.Detail)
-	backend.channel <- stone.EventRelease(keysymToButtonCode(keysym))
+	button   := backend.keycodeToButton(keyEvent.Detail, keyEvent.State)
+	backend.channel <- stone.EventRelease(button)
 }
 
 func (backend *Backend) handleMotionNotify (

backends/x/unicode.go

@@ -1,5 +1,6 @@
 package x
 
+import "unicode"
 import "github.com/jezek/xgb/xproto"
 import "github.com/jezek/xgbutil/keybind"
 import "git.tebibyte.media/sashakoshka/stone"
@@ -55,48 +56,138 @@ var buttonCodeTable = map[xproto.Keysym] stone.Button {
 	0xFFC9: stone.KeyF12,
 }
 
-func (backend *Backend) keycodeToKeysym (
+func (backend *Backend) keycodeToButton (
 	keycode xproto.Keycode,
+	state   uint16,
 ) (
-	keysym xproto.Keysym,
+	button stone.Button,
 ) {
-	keysym = keybind.KeysymGet(backend.connection, keycode, 0)
+	// FIXME: also set shift to true if the lock modifier is on and the lock
+	// modifier is interpreted as shiftLock
+	shift    := state & xproto.ModMaskShift > 0
+
+	// FIXME: only set this to true if the lock modifier is on and the lock
+	// modifier is interpreted as capsLock
+	capsLock := state & xproto.ModMaskLock  > 0
+
+	symbol1 := keybind.KeysymGet(backend.connection, keycode, 0)
+	symbol2 := keybind.KeysymGet(backend.connection, keycode, 1)
+	symbol3 := keybind.KeysymGet(backend.connection, keycode, 2)
+	symbol4 := keybind.KeysymGet(backend.connection, keycode, 3)
+
+	cased := false
+
+	// third paragraph
+	switch {
+	case symbol2 == 0 && symbol3 == 0 && symbol4 == 0:
+		symbol3 = symbol1
+	case symbol3 == 0 && symbol4 == 0:
+		symbol3 = symbol1
+		symbol2 = symbol2
+	case symbol4 == 0:
+		symbol4 = 0
+	}
+
+	symbol1Rune := keysymToRune(symbol1)
+	symbol2Rune := keysymToRune(symbol2)
+	symbol3Rune := keysymToRune(symbol3)
+	symbol4Rune := keysymToRune(symbol4)
+
+	// FIXME: we ignore mode switch stuff
+	_ = symbol4Rune
+
+	// fourth paragraph
+	if symbol2 == 0 {
+		upper := unicode.IsUpper(symbol1Rune)
+		lower := unicode.IsLower(symbol1Rune)
+		if upper || lower {
+			symbol1Rune = unicode.ToLower(symbol1Rune)
+			symbol2Rune = unicode.ToUpper(symbol1Rune)
+			cased = true
+		} else {
+			symbol2 = symbol1
+		}
+	}
+	if symbol4 == 0 {
+		upper := unicode.IsUpper(symbol3Rune)
+		lower := unicode.IsLower(symbol3Rune)
+		if upper || lower {
+			symbol3Rune = unicode.ToLower(symbol3Rune)
+			symbol4Rune = unicode.ToUpper(symbol3Rune)
+			cased = true
+		} else {
+			symbol4 = symbol3
+		}
+	}
+
+	var selectedKeysym xproto.Keysym
+	var selectedRune   rune
+	
+	// big ol list in the middle
+	switch {
+	// FIXME: take into account numlock
+	case !shift && !capsLock:
+		selectedKeysym = symbol1
+		selectedRune   = symbol1Rune
+		
+	case !shift && capsLock:
+		if cased && unicode.IsLower(symbol1Rune) {
+			selectedRune = symbol2Rune
+		} else {
+			selectedKeysym = symbol1
+			selectedRune   = symbol1Rune
+		}
+		
+	case shift && capsLock:
+		if cased && unicode.IsLower(symbol2Rune) {
+			selectedRune = unicode.ToUpper(symbol2Rune)
+		} else {
+			selectedKeysym = symbol2
+			selectedRune   = symbol2Rune
+		}
+		
+	case shift:
+		selectedKeysym = symbol3
+		selectedRune   = symbol3Rune
+	}
+
+	// look up in table
+	var isControl bool
+	button, isControl = buttonCodeTable[selectedKeysym]
+	if isControl { return }
+
+	button = stone.Button(selectedRune)
 
 	// TODO: shift isnt working. follow
 	// https://tronche.com/gui/x/xlib/input/keyboard-encoding.html
 	
 	println("--")
 	println(keycode)
-	println(keysym)
-	println(stone.EventPress(keysymToButtonCode(keysym)))
+	println(selectedKeysym)
+	println(selectedRune)
+	println(button)
 	
 	return
 }
 
-func keysymToButtonCode (keysym xproto.Keysym) (button stone.Button) {
-	var isControl bool
-	button, isControl = buttonCodeTable[keysym]
-	if isControl { return }
+func keysymToRune (keysym xproto.Keysym) (character rune) {
+	// X keysyms like 0xFF.. or 0xFE.. are non-character keys. these cannot
+	// be converted so we return a zero.
+	if (keysym >> 8) == 0xFF || (keysym >> 8) == 0xFE {
+		character = 0
+		return
+	}
 	
 	// some X keysyms have a single bit set to 1 here. i believe this is to
 	// prevent conflicts with existing codes. if we mask it off we will get
 	// a correct utf-32 code point.
 	if keysym & 0xF000000 == 0x1000000 {
-		button = stone.Button(keysym & 0x0111111)
-		return
-	}
-
-	// X keysyms like 0xFF.. or 0xFE.. are non-character keys. we already
-	// resolve these by looking them up in the button code table, so if any
-	// that we don't support pop up we should just silence them as it is
-	// effectively garbage data as far as stone applications are concerned.
-	if (keysym >> 8) == 0xFF || (keysym >> 8) == 0xFE {
-		button = stone.ButtonUnknown
+		character = rune(keysym & 0x0111111)
 		return
 	}
 
 	// if none of these things happened, we can safely (i think) assume that
 	// the keysym is an exact utf-32 code point.
-	button = stone.Button(keysym)
+	character = rune(keysym)
 	return
 }