feat: reloading modules

res/layouts/console.xml.lua

@@ -172,6 +172,7 @@ function run_current_file()
         world = world.reload_script,
         hud = hud.reload_script,
         component = entities.reload_component,
+        module = reload_module,
     }
     func = funcs[script_type] or func
     local output = core.capture_output(function() func(unit) end)

res/scripts/stdmin.lua

@@ -475,6 +475,35 @@ function on_deprecated_call(name, alternatives)
     end
 end
 
+function reload_module(name)
+    local prefix, name = parse_path(name)
+    local path = prefix..":modules/"..name..".lua"
+
+    local previous = package.loaded[path]
+    if not previous then
+        debug.log("attempt to reload non-loaded module "..name.." ("..path..")")
+        return
+    end
+    local script, err = load(file.read(path), path)
+    if script == nil then
+        error(err)
+    end
+    local result = script()
+    if not result then
+        return
+    end
+    for i, value in ipairs(result) do
+        previous[i] = value
+    end
+    local copy = table.copy(result)
+    for key, value in pairs(result) do
+        result[key] = nil
+    end
+    for key, value in pairs(copy) do
+        previous[key] = value
+    end
+end
+
 -- Load script with caching
 --
 -- path - script path `contentpack:filename`.