Implement bindsym --release

This is a "simple" version of --release (same as i3) that only supports
a binding that contain one normal key. e.g.:

    bindsym --release $mod+x exec somthing-fun

I didn't bother implementing it for a combination like `$mod+x+z` since
it is a bit tricky to get right and also a bit weird to actually do on a
keyboard.

2 files changed, 4 insertions, 0 deletions

diff --git a/include/config.h b/include/config.h
index 5e1c39f3..8220f804 100644
--- a/include/config.h
+++ b/include/config.h
@@ -22,6 +22,7 @@ struct sway_variable {
  */
 struct sway_binding {
         int order;
+        bool release;
         list_t *keys;
         uint32_t modifiers;
         char *command;
diff --git a/include/input_state.h b/include/input_state.h
index 79e27d91..903301fb 100644
--- a/include/input_state.h
+++ b/include/input_state.h
@@ -9,6 +9,9 @@
 // returns true if key has been pressed, otherwise false
 bool check_key(uint32_t key_sym, uint32_t key_code);
 
+// returns true if key_sym matches latest released key.
+bool check_released_key(uint32_t key_sym);
+
 // sets a key as pressed
 void press_key(uint32_t key_sym, uint32_t key_code);