Feat: Add a some mappings

src/mappings.v

@@ -0,0 +1,65 @@
+module main
+
+type MappingValue = Comment | Field
+
+[params]
+struct Field {
+	// The name of the field in openttd.cfg file.
+	// This is the thing OpenTTD seees.
+	name string [required]
+	// The docs for the field.
+	docs string [required]
+	// The value of the field.
+	value string [required]
+	// Transforms the value.
+	transformer fn (string) string = fn (s string) string {
+		return s
+	}
+}
+
+type Comment = string
+
+fn field(f Field) MappingValue {
+	return f
+}
+
+fn comment(c Comment) MappingValue {
+	return c
+}
+
+fn seconds_to_ticks(s string) string {
+	return (s.int() * 1000 / 30).str()
+}
+
+const mappings = {
+	'time_limits.maximum_initialization_time': field(
+		name: 'network.max_init_time'
+		docs: 'The time the client has to initialize the game in seconds.'
+		value: '5'
+		transformer: seconds_to_ticks
+	)
+	'time_limits.maximum_join_time':           field(
+		name: 'network.max_join_time'
+		docs: 'The time the client has to join the server in seconds.'
+		value: '20'
+		transformer: seconds_to_ticks
+	)
+	'time_limits.maximum_download_time':       field(
+		name: 'network.max_download_time'
+		docs: 'The time the client has to download the map in seconds.'
+		value: '300'
+		transformer: seconds_to_ticks
+	)
+	'time_limits.maximum_password_time':       field(
+		name: 'network.max_password_time'
+		docs: 'The time the client has to enter the server password in seconds.'
+		value: '600'
+		transformer: seconds_to_ticks
+	)
+	'time_limits.maximum_lag_time':            field(
+		name: 'network.max_lag_time'
+		docs: 'The time the client can lag behind the server in seconds.'
+		value: '20'
+		transformer: seconds_to_ticks
+	)
+}