Consider implementing xcode-locator in osascript

[steeve]

Description of the problem / feature request:

xcode-locator locates the xcode versions installed on the system . It is written in ObjC because it needs LSCopyApplicationURLsForBundleIdentifier. Thus, it needs to be compiled inside a repository rule, which is somewhat of an anti pattern.

It is possible to replace it with JXA, here is a rapid prototype:

#!/usr/bin/osascript -l JavaScript
ObjC.import("CoreServices");

ObjC.bindFunction("CFMakeCollectable", [ "id", [ "void *" ] ]);
Ref.prototype.toNS = function () { return $.CFMakeCollectable(this); };
String.prototype.toCF = function() { return $.CFStringCreateWithCString(0, this, 0).toNS(); };

function applicationURLsForBundleIdentifier(bundleId) {
	const bundles = $.LSCopyApplicationURLsForBundleIdentifier(bundleId.toCF(), $());
	return ObjC.deepUnwrap(bundles.toNS());
}

function bundleVersion(bundle) {
	return ObjC.unwrap(bundle.infoDictionary.objectForKey("CFBundleShortVersionString"));
}

function xcodeBundleProductVersion(bundle) {
	const versionPlistUrl = bundle.bundleURL.URLByAppendingPathComponent("Contents/version.plist");
	const info = $.NSDictionary.alloc.initWithContentsOfURL(versionPlistUrl);
	return ObjC.unwrap(info.objectForKey("ProductBuildVersion"));
}

function expandVersion(version) {
	const parts = version.split(".");
	switch (parts.length) {
		case 1:
			return version + ".0.0";
		case 2:
			return version + ".0";
	}
	return version;
}

function xcodeBundles() {
	const xcodeBundleId = "com.apple.dt.Xcode";
	return applicationURLsForBundleIdentifier(xcodeBundleId).map((url) => {
		return $.NSBundle.bundleWithURL(url);
	}).filter((bundle) => {
		return ObjC.unwrap(bundle.bundleIdentifier) == xcodeBundleId
	}).reduce((xcodes, bundle) => {
		var version = expandVersion(bundleVersion(bundle));
		const productVersion = xcodeBundleProductVersion(bundle);
		if (productVersion) {
			version += "." + productVersion;
		}
		xcodes[version] = ObjC.unwrap(bundle.bundlePath) + "/Contents/Developer";
		return xcodes;
	}, {});
}

function main(argv) {
	const xcodes = xcodeBundles();
	console.log(JSON.stringify(xcodes));
}

main($.NSProcessInfo.processInfo.arguments.js.filter((_, idx) => idx >= 3).map((arg) => arg.js));

When run:

$ ./xcodes.js
{"12.5.0.12E262":"/Applications/Xcode-12.5.0.app/Contents/Developer"}
$

What operating system are you running Bazel on?

macOS

Have you found anything relevant by searching the web?

• Build xcode-locator as a universal binary #14168
• Compile Apple tools as fat binaries if possible #13452

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[github-actions]

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