Add migrate command

src/commands/migrate_command.ts

@@ -0,0 +1,38 @@
+import Subcommand from "./subcommand.js";
+import {Command} from "commander";
+import ModManager from "../mod-manager.js";
+import MinecraftUtils from "../util/minecraft_utils.js";
+import Mods from "../mods/mods.js";
+import PrintUtils from "../util/print_utils.js";
+import MigrateError from "../errors/migrate_error.js";
+
+export default class MigrateCommand implements Subcommand {
+    registerCommand(program: Command): void {
+        program.command("migrate")
+            .description("Migrates all mods to provided Minecraft version")
+            .argument("[version]", "The Minecraft version to try and migrate to")
+            .option("-f, --force", "Migrates all mods, but discards any non essential mods that are not available", false)
+            .action((version, options) => {
+                ModManager.execute(async () => {
+                    const force = options.force;
+
+                    // If no version is provided, prompt user for one
+                    if (version === "" || version == undefined) {
+                        version = await MinecraftUtils.getMinecraftVersionFromInput("What Minecraft version would you like to migrate to?");
+                    }
+
+                    // Start the migration
+                    try {
+                        await Mods.migrate(version, force)
+                    } catch (e) {
+                        if (e instanceof MigrateError) {
+                            PrintUtils.error(e.message)
+                        } else {
+                            throw e;
+                        }
+                    }
+                })
+            })
+    }
+
+}

src/commands/migrate_possible.ts

@@ -20,25 +20,10 @@ export default class MigratePossibleCommand implements Subcommand {
                             version = await MinecraftUtils.getMinecraftVersionFromInput("What Minecraft version would you like to migrate to?");
                         }
 
-                        // If version is valid, check if migration is possible
-                        if (await MinecraftUtils.isValidVersion(version)) {
                         try {
-                                const possible = await Mods.isMigratePossible(version, force);
-
-                                if (possible) {
-                                    PrintUtils.success(`It is possible to migrate to version ${version}`)
-                                } else {
-                                    PrintUtils.error(`It is not possible to migrate to version ${version}`)
-                                }
+                            await Mods.isMigratePossible(version, force);
                         } catch (e) {
-                                if (!force) {
-                                    PrintUtils.error("There are no mods installed, try `mod-manager install -h` to learn more!")
-                                } else {
-                                    PrintUtils.error("There are no mods installed that are marked essential. Try `mod-manager essential -h` to learn more!")
-                                }
-                            }
-                        } else {
-                            PrintUtils.error(`${version} is not a valid Minecraft version`);
+                            PrintUtils.error(e.message)
                         }
                     }
                 )

src/errors/migrate_error.ts

@@ -0,0 +1,7 @@
+export default class MigrateError extends Error {
+    constructor(message: string | undefined) {
+        super(message);
+        this.name = this.constructor.name;
+        Error.captureStackTrace(this, this.constructor);
+    }
+}

src/mod-manager.ts

@@ -13,6 +13,7 @@ import EssentialCommand from "./commands/essential_command.js";
 import {readFileSync, unlinkSync} from "fs";
 import UpdateCommand from "./commands/upgrade_command.js";
 import MigratePossibleCommand from "./commands/migrate_possible.js";
+import MigrateCommand from "./commands/migrate_command.js";
 
 
 export default class ModManager {
@@ -27,7 +28,8 @@ export default class ModManager {
         new UninstallCommand(),
         new EssentialCommand(),
         new UpdateCommand(),
-        new MigratePossibleCommand()
+        new MigratePossibleCommand(),
+        new MigrateCommand()
     ];
 
     static FilePaths = class {

src/mods/mods.ts

@@ -7,6 +7,7 @@ import {readFileSync, unlinkSync, writeFileSync} from "fs";
 import Util from "../util/util.js";
 import ModManager from "../mod-manager.js";
 import MinecraftUtils from "../util/minecraft_utils.js";
+import MigrateError from "../errors/migrate_error.js";
 
 export default class Mods {
     private static readonly MOD_SOURCES: Array<ModSource> = [
@@ -125,7 +126,7 @@ export default class Mods {
             // Remove mod from list
             mods = mods.filter(item => !Mods.areModsEqual(item, modToMark));
 
-            // Toggle essnetial status, and write back to file
+            // Toggle essential status, and write back to file
             modToMark.essential = !modToMark.essential;
             mods.push(modToMark)
             this.writeFile(mods);
@@ -212,7 +213,15 @@ export default class Mods {
         const mods = !force ? this.getTrackedMods() : this.getEssentialMods();
 
         if (Util.isArrayEmpty(mods)) {
-            throw new Error("Mods list is empty")
+            const msg = !force ? "" +
+                "There are no mods installed, try `mod-manager install -h` to learn more!" : "" +
+                "There are no mods installed that are marked essential. Try `mod-manager essential -h` to learn more!";
+
+            throw new Error(msg)
+        }
+
+        if (!await MinecraftUtils.isValidVersion(version)) {
+            throw new Error(`${version} is not a valid Minecraft version`)
         }
 
         let availableList = [];
@@ -240,10 +249,72 @@ export default class Mods {
         availableList = availableList.filter(available => !available)
 
         // If the array is empty, all the mods reported as available, and a migration is possible
-        return Util.isArrayEmpty(availableList);
+        const possible = Util.isArrayEmpty(availableList);
+
+        // Report and return whether it is possible
+        if (possible) {
+            PrintUtils.success(`It is possible to migrate to version ${version}`)
+        } else {
+            PrintUtils.error(`It is not possible to migrate to version ${version}`)
+        }
+
+        return possible;
     }
 
     private static getEssentialMods() {
         return this.getTrackedMods().filter(mod => mod.essential);
     }
+
+    /**
+     * Migrates to the provided version of minecraft
+     * @param version
+     * @param force
+     */
+    static async migrate(version: string, force: boolean) {
+        const mods = this.getTrackedMods();
+
+        if (Util.isArrayEmpty(mods)) {
+            throw new MigrateError("There are no mods installed right now. Try `mod-manager install -h` to learn more!")
+        }
+
+        if (!await MinecraftUtils.isValidVersion(version)) {
+            throw new MigrateError(`${version} is not a valid version of Minecraft`)
+        }
+
+        if (!await Mods.isMigratePossible(version, force)) {
+            throw new MigrateError(`It is not possible to migrate to ${version}.`)
+        }
+
+        // For every tracked mod
+        for (let mod of mods) {
+            const source = this.getSourceFromName(mod.source);
+
+            const spinner = new PrintUtils.Spinner(`Uninstalling ${mod.name} ${mod.version}...`);
+            spinner.start();
+
+            try {
+                // Uninstall it
+                this.silentUninstall(mod);
+
+                // Get the latest version
+                const latestVersion = await source.getLatestVersion(mod.id, version)
+
+                // Install the new mod
+                spinner.updateText(`Installing ${mod.name} ${latestVersion.version_number}..`)
+                const newMod = await source.install(latestVersion, mod.essential)
+                this.trackMod(newMod)
+
+                spinner.succeed(`Successfully installed ${newMod.name} ${newMod.version}`)
+            } catch (e) {
+                // If a mod is not available, but is essential, throw error, else, warn user, and continue.
+                if (mod.essential) {
+                    throw new Error("Attempted to migrate a mod that is not available for migration")
+                } else {
+                    spinner.warn(`${mod.name} is not available. Discarding...`)
+                }
+            }
+        }
+
+        PrintUtils.success(`Successfully migrated to ${version}`)
+    }
 }