Machine Learning Services R Packages (#8870)

* R Package management in Machine learning services extension

extensions/machine-learning-services/src/common/utils.ts

@@ -47,6 +47,59 @@ export function getPythonExePath(rootFolder: string): string {
 		process.platform === constants.winPlatform ? 'python.exe' : 'bin/python3');
 }
 
+export function getPackageFilePath(rootFolder: string, packageName: string): string {
+	return path.join(
+		rootFolder,
+		constants.rLPackagedFolderName,
+		packageName);
+}
+
+export function getRPackagesFolderPath(rootFolder: string): string {
+	return path.join(
+		rootFolder,
+		constants.rLPackagedFolderName);
+}
+
+/**
+ * Compares two version strings to see which is greater.
+ * @param first First version string to compare.
+ * @param second Second version string to compare.
+ * @returns 1 if the first version is greater, -1 if it's less, and 0 otherwise.
+ */
+export function comparePackageVersions(first: string, second: string): number {
+	let firstVersion = first.split('.').map(numStr => Number.parseInt(numStr));
+	let secondVersion = second.split('.').map(numStr => Number.parseInt(numStr));
+
+	// If versions have different lengths, then append zeroes to the shorter one
+	if (firstVersion.length > secondVersion.length) {
+		let diff = firstVersion.length - secondVersion.length;
+		secondVersion = secondVersion.concat(new Array(diff).fill(0));
+	} else if (secondVersion.length > firstVersion.length) {
+		let diff = secondVersion.length - firstVersion.length;
+		firstVersion = firstVersion.concat(new Array(diff).fill(0));
+	}
+
+	for (let i = 0; i < firstVersion.length; ++i) {
+		if (firstVersion[i] > secondVersion[i]) {
+			return 1;
+		} else if (firstVersion[i] < secondVersion[i]) {
+			return -1;
+		}
+	}
+	return 0;
+}
+
+export function sortPackageVersions(versions: string[], ascending: boolean = true) {
+	return versions.sort((first, second) => {
+		let compareResult = comparePackageVersions(first, second);
+		if (ascending) {
+			return compareResult;
+		} else {
+			return compareResult * -1;
+		}
+	});
+}
+
 export function isWindows(): boolean {
 	return process.platform === 'win32';
 }