Add a request_keys() function with a midend wrapper.

This function gives the front end a way to find out what keys the back
end requires; and as such it is mostly useful for ports without a
keyboard. It is based on changes originally found in Chris Boyle's
Android port, though some modifications were needed to make it more
flexible.

1 files changed, 22 insertions, 0 deletions

diff --git a/keen.c b/keen.c
index ec7af12..1e531d9 100644
--- a/keen.c
+++ b/keen.c
@@ -1251,6 +1251,27 @@ static const char *validate_desc(const game_params *params, const char *desc)
     return NULL;
 }
 
+static key_label *game_request_keys(const game_params *params, int *nkeys)
+{
+    int i;
+    int w = params->w;
+
+    key_label *keys = snewn(w+1, key_label);
+    *nkeys = w + 1;
+
+    for (i = 0; i < w; i++) {
+        if (i<9) keys[i].button = '1' + i;
+        else keys[i].button = 'a' + i - 9;
+
+        keys[i].label = NULL;
+    }
+    keys[w].button = '\b';
+    keys[w].label = NULL;
+
+
+    return keys;
+}
+
 static game_state *new_game(midend *me, const game_params *params,
                             const char *desc)
 {
@@ -2354,6 +2375,7 @@ const struct game thegame = {
     free_ui,
     encode_ui,
     decode_ui,
+    game_request_keys,
     game_changed_state,
     interpret_move,
     execute_move,