new path rules

Author: devsnek

README.md

@@ -8,7 +8,12 @@ esvu is your one-stop shop for all implementations of ECMAScript.
 $ npm i -g esvu
 ```
 
-Add `~/.esvu/bin` to your `PATH`.
+esvu will attempt to respect `XDG_DATA_HOME`, and will fall back to the
+home directory. You will need to add esvu's bin to your `PATH`, for
+example `$XDG_DATA_HOME/.esvu/bin` or `/home/snek/.esvu/bin`.
+
+You may override the path entirely by setting the `ESVU_PATH` environment
+variable.
 
 ## Usage
 

src/common.js

@@ -7,7 +7,18 @@ const extractZip = require('extract-zip');
 const tar = require('tar');
 const rimraf = require('rimraf');
 
-const ESVU_PATH = path.join(os.homedir(), '.esvu');
+const ESVU_PATH = (() => {
+  const NEW_ESVU_PATH = process.env.ESVU_PATH || path.join(process.env.XDG_DATA_HOME || os.homedir(), '.esvu');
+  const OLD_ESVU_PATH = path.join(os.homedir(), '.esvu');
+
+  try {
+    fs.statSync(path.join(OLD_ESVU_PATH, 'status.json'));
+    return OLD_ESVU_PATH;
+  } catch {
+    return NEW_ESVU_PATH;
+  }
+})();
+
 const STATUS_PATH = path.join(ESVU_PATH, 'status.json');
 
 async function fileExists(file) {