NMLTutorial/Version check
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Jump to navigationJump to searchVersion checks in NML are actually pretty straight forward.
NML provides the global variables openttd_version and ttd_platform. Concerning version checks the built-in function version_openttd comes in very handy as it provides an easy means to specify the version instead of manually constructing the version number corresponding to a specific version.
Thus checking for the TTD platform is simply done by an if block:
if (ttd_platform != PLATFORM_OPENTTD) {
error(FATAL, REQUIRES_OPENTTD, string(STR_MIN_OPENTTD_VERSION));
exit;
}
as is the check for a specific OpenTTD (and similarily TTDPatch) version:
/* Only define cargo_age_period when that property is available */
if (openttd_version > version_openttd(1, 2, 0, 22713)) {
item (FEAT_TRAINS, my_engine) {
property {
cargo_age_period: 200;
}
}
}
It's also possible to combine these checks into a single block:
/* Long date string codes require OpenTTD > 1.2.0 or r22780 */
if (ttd_platform != PLATFORM_OPENTTD || openttd_version < version_openttd(1, 2, 0, 22780)) {
error(FATAL, REQUIRES_OPENTTD, string(STR_MIN_OPENTTD_VERSION));
exit;
}
NML Tutorial: Version check
