Support AltGr (ISO_Level3_Shift) as a modifier key

man.md

@@ -59,7 +59,8 @@ and each modifier is one of:
 \    **C** - Control\
 \    **M** - Meta/Super\
 \    **A** - Alt\
-\    **S** - Shift
+\    **S** - Shift\
+\    **I** - AltGr (ISO_Level3_Shift)
 
 In addition to simple key mappings keyd can remap keys to actions which
 can conditionally send keystrokes or transform the state of the keymap. 

src/config.c

@@ -71,6 +71,11 @@ static const char *modseq_to_string(uint8_t mods) {
 		i+=2;
 	}
 
+	if(mods & MOD_ALT_GR) {
+		strcpy(s+i, "-I");
+		i+=2;
+	}
+
 	if(i)
 		return s+1;
 	else
@@ -105,6 +110,11 @@ static const char *keyseq_to_string(uint32_t keyseq) {
 		i+=2;
 	}
 
+	if(mods & MOD_ALT_GR) {
+		strcpy(s+i, "I-");
+		i+=2;
+	}
+
 	if(key)
 		strcpy(s+i, keycode_strings[code]);
 	else
@@ -131,6 +141,9 @@ static int parse_mods(const char *s, uint8_t *mods)
 		case 'S':
 			*mods |= MOD_SHIFT;
 			break;
+		case 'I':
+			*mods |= MOD_ALT_GR;
+			break;
 		default:
 			return -1;
 			break;
@@ -170,6 +183,9 @@ static int parse_keyseq(const char *s, uint16_t *keycode, uint8_t *mods) {
 		case 'S':
 			*mods |= MOD_SHIFT;
 			break;
+		case 'I':
+			*mods |= MOD_ALT_GR;
+			break;
 		default:
 			return -1;
 			break;

src/keys.h

@@ -41,6 +41,7 @@
 #define MOD_SHIFT 0x4
 #define MOD_SUPER 0x2
 #define MOD_ALT 0x1
+#define MOD_ALT_GR 0x10
 
 static const char *keycode_strings[] = {
 	[KEY_ESC] = "esc",

src/main.c

@@ -244,6 +244,8 @@ static void send_mods(uint16_t mods, int pressed)
 		send_key(KEY_LEFTMETA, pressed);
 	if(mods & MOD_ALT)
 		send_key(KEY_LEFTALT, pressed);
+	if(mods & MOD_ALT_GR)
+		send_key(KEY_RIGHTALT, pressed);
 }
 
 static void send_keyseq(uint32_t keyseq, int pressed)