1.0.0

- Add `setup`, `install`, `remove`, and `update`.

.gitattributes

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+# General
+* text=auto
+
+# Project
+package-lock.json -diff

.gitignore

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+node_modules/
+*.jar

changelog.md

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+# Changelog
+
+## 1.0.0
+*2021-04-04*
+- Added functions and CLI commands `setup`, `install`, `remove`, and `update`.

index.js

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+const fs = require('fs');
+const download = require('download');
+const curseforge = require('mc-curseforge-api');
+
+const VERSION = '1.0.0';
+const MODS_FILE = 'mods.json';
+
+function getConfig() { return JSON.parse(fs.readFileSync(MODS_FILE, { encoding: 'utf8' }, data => data)); }
+function getUrlFileName(url) { return url.match(/[^/]+$/)?.[0]; }
+
+async function getMod(source, modID) {
+    switch (source) {
+        case 'curseforge': return await curseforge.getMod(+modID);
+    }
+}
+
+async function getModFiles(source, modID) {
+    switch (source) {
+        case 'curseforge': return await curseforge.getModFiles(+modID);
+    }
+}
+
+function getValidVersions(versions, mcver) {
+    const validVers = versions.filter(obj => {
+        const getMajor = ver => ver.replace(/^(\d+\.\d+).*$/, '$1');
+        return obj.minecraft_versions.map(ver => getMajor(ver)).includes(getMajor(mcver));
+    });
+    return validVers;
+}
+
+async function setup(mcver) {
+    const data = { versions: { minecraft: mcver }, mods: {} };
+    fs.writeFile(MODS_FILE, JSON.stringify(data, {}, 4), { encoding: 'utf8' }, data => data);
+}
+
+async function install(srcArg, modID) {
+    if (!modID) throw new Error(`Mod host argument is missing. Try 'modmanager install curse ${srcArg}'.`);
+    const source = /^-*c/.test(srcArg) ? 'curseforge' : srcArg;
+    const modsJson = getConfig();
+    const mcver = modsJson.version.minecraft;
+    const modinfo = await getMod(source, modID);
+    const files = getValidVersions(await getModFiles(source, modID), mcver);
+    if (!files.length) throw new Error(`No valid ${mcver} versions for mod ${modID} ${modinfo.name}`);
+    modsJson.mods[modID] = {
+        name: modinfo.name,
+        host: source,
+        url: modinfo.url,
+        version: getUrlFileName(files[0].download_url),
+    }
+    download(files[0].download_url, '.');
+    fs.writeFile(MODS_FILE, JSON.stringify(modsJson, {}, 4), { encoding: 'utf8' }, data => data);
+}
+
+async function remove(modID) {
+    const modsJson = getConfig();
+    if (!modsJson.mods[modID]) return;
+    fs.unlink('./' + modsJson.mods[modID].version, err => err && console.log(err))
+    delete modsJson.mods[modID];
+    fs.writeFile(MODS_FILE, JSON.stringify(modsJson, {}, 4), { encoding: 'utf8' }, data => data);
+}
+
+async function update() {
+    const modsJson = getConfig();
+    const mcver = modsJson.version.minecraft;
+    for (let [modID, obj] of Object.entries(modsJson.mods)) {
+        const files = getValidVersions(await curseforge.getModFiles(modID), mcver);
+        const dlUrl = files[0]?.download_url;
+        if (!dlUrl || getUrlFileName(dlUrl) !== obj.version) {
+            install(modID).catch(e => { console.error(e) });
+        }
+    }
+}
+
+module.exports = { install, remove, update, setup };
+
+const args = process.argv.slice(2);
+if (args[0]) {
+    if (args[0].includes('h')) console.log(`
+    ModManager commands:
+
+        modmanager help
+            Display this help message.
+        modmanager setup <mcVersion>
+            Initialise a 'mods.json' listing file with a given Minecraft version.
+        modmanager install curse <modID>
+            Install a mod from CurgeForge, saving its metadata to 'mods.json'.
+        modmanager remove <modID>
+            Uninstall a mod and remove its metadata from 'mods.json'.
+        modmanager update
+            Update all mods specified in the 'mods.json' file.
+        modmanager version
+            Display the current version of ModManager.
+    `);
+    else if (args[0].includes('s')) init(args[1]).catch(e => console.error(e));
+    else if (args[0].includes('i')) install(args[1], args[2]).catch(e => console.error(e));
+    else if (args[0].includes('r')) remove(args[1]).catch(e => console.error(e));
+    else if (args[0].includes('u')) update().catch(e => console.error(e));
+    else if (args[0].includes('v')) console.log(`The current version of ModManager is ${VERSION}`)
+}

license.md

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+# ISC License
+
+Copyright © 2021 Nixinova
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+The software is provided "as is" and the author disclaims all warranties
+with regard to this software including all implied warranties of
+merchantability and fitness. In no event shall the author be liable for
+any special, direct, indirect, or consequential damages or any damages
+whatsoever resulting from loss of use, data or profits, whether in an
+action of contract, negligence or other tortious action, arising out of
+or in connection with the use or performance of this software.

mods.json

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+{
+    "version": {
+        "minecraft": "1.16"
+    },
+    "mods": {
+        "238222": {
+            "name": "Just Enough Items (JEI)",
+            "host": "curseforge",
+            "url": "https://www.curseforge.com/minecraft/mc-mods/jei",
+            "version": "jei-1.16.4-7.6.0.56.jar"
+        }
+    }
+}