From 94e81d179d20413d8fe1aa9c3e20583887059b6a Mon Sep 17 00:00:00 2001
From: cos <cos>
Date: Thu, 10 Jan 2019 22:08:25 +0100
Subject: Make AltGr a key modifier with prefix G

This code kind of works for me, but no thought has been put into correct implementation.
---
 src/actions.c |  4 ++++
 src/data.h    |  2 ++
 src/input.c   | 11 +++++++++++
 3 files changed, 17 insertions(+)

diff --git a/src/actions.c b/src/actions.c
index e65ca0c..14828b7 100644
--- a/src/actions.c
+++ b/src/actions.c
@@ -1215,6 +1215,10 @@ parse_keydesc (char *keydesc, struct rp_key *key)
                 {
                   key->state |= RP_ALT_MASK;
                 }
+              else if (!strcmp (token, "G"))
+                {
+                  key->state |= RP_ALTGR_MASK;
+                }
               else if (!strcmp (token, "S"))
                 {
                   key->state |= RP_SHIFT_MASK;
diff --git a/src/data.h b/src/data.h
index ac87fea..c6e5571 100644
--- a/src/data.h
+++ b/src/data.h
@@ -341,12 +341,14 @@ struct rp_child_info
 #define RP_ALT_MASK     8
 #define RP_SUPER_MASK   16
 #define RP_HYPER_MASK   32
+#define RP_ALTGR_MASK   64
 
 struct modifier_info
 {
 /*   unsigned int mode_switch_mask; */
   unsigned int meta_mod_mask;
   unsigned int alt_mod_mask;
+  unsigned int altgr_mod_mask;
   unsigned int super_mod_mask;
   unsigned int hyper_mod_mask;
 
diff --git a/src/input.c b/src/input.c
index c71d58c..7d27a77 100644
--- a/src/input.c
+++ b/src/input.c
@@ -47,6 +47,7 @@ x11_mask_to_rp_mask (unsigned int mask)
   result |= mask & ControlMask ? RP_CONTROL_MASK:0;
   result |= mask & rp_modifier_info.meta_mod_mask ? RP_META_MASK:0;
   result |= mask & rp_modifier_info.alt_mod_mask ? RP_ALT_MASK:0;
+  result |= mask & rp_modifier_info.altgr_mod_mask ? RP_ALTGR_MASK:0;
   result |= mask & rp_modifier_info.hyper_mod_mask ? RP_HYPER_MASK:0;
   result |= mask & rp_modifier_info.super_mod_mask ? RP_SUPER_MASK:0;
 
@@ -69,6 +70,7 @@ rp_mask_to_x11_mask (unsigned int mask)
   result |= mask & RP_CONTROL_MASK ? ControlMask:0;
   result |= mask & RP_META_MASK ? rp_modifier_info.meta_mod_mask:0;
   result |= mask & RP_ALT_MASK ? rp_modifier_info.alt_mod_mask:0;
+  result |= mask & RP_ALTGR_MASK ? rp_modifier_info.altgr_mod_mask:0;
   result |= mask & RP_HYPER_MASK ? rp_modifier_info.hyper_mod_mask:0;
   result |= mask & RP_SUPER_MASK ? rp_modifier_info.super_mod_mask:0;
 
@@ -139,6 +141,7 @@ update_modifier_map (void)
 
   rp_modifier_info.meta_mod_mask = 0;
   rp_modifier_info.alt_mod_mask = 0;
+  rp_modifier_info.altgr_mod_mask = 0;
   rp_modifier_info.super_mod_mask = 0;
   rp_modifier_info.hyper_mod_mask = 0;
   rp_modifier_info.num_lock_mask = 0;
@@ -187,6 +190,13 @@ update_modifier_map (void)
                                   rp_modifier_info.alt_mod_mask));
                     break;
 
+                  case XK_ISO_Level3_Shift:
+                    found_alt_or_meta = 1;
+                    rp_modifier_info.altgr_mod_mask |= modmasks[row - 3];
+                    PRINT_DEBUG (("Found Alt on %d\n",
+                                  rp_modifier_info.altgr_mod_mask));
+                    break;
+
                   case XK_Super_L:
                   case XK_Super_R:
                     if (!found_alt_or_meta)
@@ -377,6 +387,7 @@ cook_keycode (XKeyEvent *ev, KeySym *keysym, unsigned int *mod, char *keysym_nam
   *mod = ev->state;
   *mod &= (rp_modifier_info.meta_mod_mask
            | rp_modifier_info.alt_mod_mask
+           | rp_modifier_info.altgr_mod_mask
            | rp_modifier_info.hyper_mod_mask
            | rp_modifier_info.super_mod_mask
            | ControlMask
-- 
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