console.lua: allow clicking selectable items

This adds click support for the select menu. Scrolling with the wheel
already worked.

If a custom OSC binds a button to a select.lua script-binding, this lets
users keep using the mouse to select an item.

While the OSC and the select menu are open at the same time, you can no
longer click the OSC's buttons. By using mp.add_key_binding instead of
add_forced_key_binding you could click both, but the console's binding
would be shadowed by MBTN_LEFT bindings in input.conf.

player/lua/console.lua

@@ -791,6 +791,11 @@ local function help_command(param)
     log_add(output:sub(1, -2))
 end
 
+local function unbind_mouse()
+    mp.remove_key_binding('_console_mouse_move')
+    mp.remove_key_binding('_console_mbtn_left')
+end
+
 -- Run the current command and clear the line (Enter)
 local function handle_enter()
     if searching_history then
@@ -800,6 +805,7 @@ local function handle_enter()
         cursor = #line + 1
         log_buffers[id] = {}
         update()
+        unbind_mouse()
         return
     end
 
@@ -833,6 +839,42 @@ local function handle_enter()
     clear()
 end
 
+local function bind_mouse()
+    mp.add_forced_key_binding('MOUSE_MOVE', '_console_mouse_move', function()
+        local height = mp.get_property_native('osd-height')
+        if height == 0 then
+            return
+        end
+
+        local y = mp.get_property_native('mouse-pos').y - global_margins.t * height
+        -- Calculate how many lines could be printed without decreasing them for
+        -- the input line and OSC.
+        local max_lines = height / mp.get_property_native('display-hidpi-scale')
+                          / opts.font_size
+        local clicked_line = math.floor(y / height * max_lines + .5)
+
+        -- Subtract 1 line for "n hidden items" when necessary.
+        local offset = first_match_to_print == 1 and 0 or first_match_to_print - 2
+        max_lines = calculate_max_log_lines()
+
+        if #matches < max_lines then
+            clicked_line = clicked_line - (max_lines - #matches)
+            max_lines = #matches
+        elseif offset + max_lines < #matches then
+            -- Subtract 1 line for "n hidden items".
+            max_lines = max_lines - 1
+        end
+
+        if selected_match ~= offset + clicked_line
+           and clicked_line > 0 and clicked_line <= max_lines then
+            selected_match = offset + clicked_line
+            update()
+        end
+    end)
+
+    mp.add_forced_key_binding('MBTN_LEFT', '_console_mbtn_left', handle_enter)
+end
+
 -- Go to the specified position in the command history
 local function go_history(new_pos)
     local old_pos = history_pos
@@ -932,6 +974,7 @@ local function search_history()
     end
 
     update()
+    bind_mouse()
 end
 
 local function page_up_or_prev_char()
@@ -1665,6 +1708,7 @@ set_active = function (active)
         cursor = 1
         selectable_items = nil
         log_buffers[id] = {}
+        unbind_mouse()
     else
         repl_active = false
         suggestion_buffer = {}
@@ -1679,6 +1723,7 @@ set_active = function (active)
             cursor = 1
             selectable_items = nil
             dont_bind_up_down = false
+            unbind_mouse()
         end
         collectgarbage()
     end
@@ -1754,6 +1799,7 @@ mp.register_script_message('get-input', function (script_name, args)
         for i, item in ipairs(selectable_items) do
             matches[i] = { index = i, text = item }
         end
+        bind_mouse()
     end
 
     set_active(true)