Move keymap as an implementation detail of the normal mode keys

Only expose a free function that tries to get the NormalCmd from a
key.

src/input_handler.cc

@@ -281,19 +281,18 @@ public:
                 context().client().info_hide();
 
             do_restore_hooks = true;
-            auto it = keymap.find(key);
+            if (auto command = get_normal_command(key))
-            if (it != keymap.end() and it->key == key)
             {
                 auto autoinfo = context().options()["autoinfo"].get<AutoInfo>();
                 if (autoinfo & AutoInfo::Normal and context().has_client())
-                    context().client().info_show(key_to_str(key), it->value.docstring.str(),
+                    context().client().info_show(key_to_str(key), command->docstring.str(),
                                                  {}, InfoStyle::Prompt);
 
                 // reset m_params now to be reentrant
                 NormalParams params = m_params;
                 m_params = { 0, 0 };
 
-                it->value.func(context(), params);
+                command->func(context(), params);
             }
         }
 

src/normal.cc

@@ -1943,7 +1943,7 @@ void force_redraw(Context& context, NormalParams)
     }
 }
 
-const HashMap<Key, NormalCmd> keymap{
+static const HashMap<Key, NormalCmd> keymap{
     { {'h'}, {"move left", move<CharCount, Backward>} },
     { {'j'}, {"move down", move<LineCount, Forward>} },
     { {'k'}, {"move up",  move<LineCount, Backward>} },
@@ -2131,4 +2131,12 @@ const HashMap<Key, NormalCmd> keymap{
     { {ctrl('l')}, {"force redraw", force_redraw} },
 };
 
+Optional<NormalCmd> get_normal_command(Key key)
+{
+    auto it = keymap.find(key);
+    if (it != keymap.end())
+        return it->value;
+    return {};
+}
+
 }

src/normal.hh

@@ -1,7 +1,7 @@
 #ifndef normal_hh_INCLUDED
 #define normal_hh_INCLUDED
 
-#include "hash_map.hh"
+#include "optional.hh"
 #include "keys.hh"
 #include "string.hh"
 
@@ -22,7 +22,7 @@ struct NormalCmd
     void (*func)(Context& context, NormalParams params);
 };
 
-extern const HashMap<Key, NormalCmd> keymap;
+Optional<NormalCmd> get_normal_command(Key key);
 
 }