support project id

README.MD

@@ -8,17 +8,29 @@ Worry no more, because here you got
 > Warning: If you are so afraid of cmd, better go away from here. Here you got something with [GUI written in Java](https://github.com/Vazkii/CMPDL), I don't know how it works, use at your own responsibility. Maybe I will add some GUI to this project later
 
 ## Usage
-First you need project name, you take it from modpack url  
-![](img/1.png)  
-Now just open your terminal/cmd, enter the directory when you want to download modpack and type
+### Using Project ID
+Find the project ID on the modpack's CurseForge page.
+
+![](img/3.png)
+
+Open your terminal/cmd, enter the directory when you want to download modpack and type `cmpdl <project id>`
+
+For example, [Project Ozone Lite (https://www.curseforge.com/minecraft/modpacks/project-ozone-lite)](https://www.curseforge.com/minecraft/modpacks/project-ozone-lite)
 ```bash
-    cmpdl <project name>
+    cmpdl 273726
 ```
-For example
+
+### Using Project Name/Slug
+Or you can try using the project name taken from modpack url, but this method is slower and not always successful. 
+
+![](img/1.png)  
+
+Now just open your terminal/cmd, enter the directory when you want to download modpack and type `cmpdl <project name>`
+
+For example, [Project Ozone Lite (https://www.curseforge.com/minecraft/modpacks/project-ozone-lite)](https://www.curseforge.com/minecraft/modpacks/project-ozone-lite)
 ```bash
     cmpdl project-ozone-light
 ```
-And wait until it's downloaded
 
 # Installation
 ## Install node with npm for your operating system from [here](https://nodejs.org/en/)

cli.js

@@ -71,7 +71,12 @@ async function getProjectById(projectId) {
         const res = await requestPromise.get(`${BASE_URL}/addon/${projectId}`);
         return JSON.parse(res);
     } catch (err) {
-        console.error(err);
+        if (err.statusCode == 404) {
+            console.error(`Can't find project ${projectId}.`);
+        }
+        else {
+            console.error(err);
+        }
         process.exit(1);
     }
 }
@@ -93,7 +98,7 @@ async function getProjectFiles(projectId) {
 
 /**
  * 
- * @param {string} project project name
+ * @param {string} projectSlug project slug
  * @returns { { url: string, version: string, fileName: string } }
  */
 async function getLatestProjectFileUrl(projectSlug) {
@@ -106,6 +111,21 @@ async function getLatestProjectFileUrl(projectSlug) {
     }
 }
 
+/**
+ * 
+ * @param {string} projectId project ID
+ * @returns { { url: string, version: string, fileName: string } }
+ */
+async function getLatestProjectFileUrlById(projectId) {
+    const project = await getProjectById(projectId);
+    const defaultFile = project.latestFiles.filter(x => x.id == project.defaultFileId)[0];
+    return {
+        url: defaultFile.downloadUrl,
+        version: defaultFile.displayName,
+        fileName: defaultFile.fileName
+    }
+}
+
 /**
  * 
  * @param {string} projectId project ID
@@ -154,12 +174,18 @@ function removeIllegalCharactersFromFilename(filename) {
  */
 async function main(argv) {
     if(argv.length < 3) {
-        console.error("Usage: cmpdl <project name>");
+        console.error("Usage: cmpdl <project id|project name>");
         process.exit(1);
     }
     const project = argv[2];
-    console.log("Searching for project main file");
-    const latest = await getLatestProjectFileUrl(project);
+    let latest;
+    if (isNaN(parseInt(project, 10))) {
+        console.log("Searching for project main file");
+        latest = await getLatestProjectFileUrl(project);
+    }
+    else {
+        latest = await getLatestProjectFileUrlById(project);
+    }
     createModpacksFolder();
     const projectFolderName = removeIllegalCharactersFromFilename(latest.version);
     createProjectFolder(projectFolderName);