feat: add xdg support

If ~/.local/share/polar exists, use it to store application data instead
of ~/.polar, abiding to the XDG specification.

The xdg directory is not  created  automatically  (the  user  must  have
created it manually beforehand) and if it does not exist, the  data  dir
falls back to ~/.polar.

e2e/helpers/index.ts

@@ -1,7 +1,6 @@
 import { remove } from 'fs-extra';
-import { join } from 'path';
-import { homedir } from 'os';
 import { ClientFunction } from 'testcafe';
+import { networksPath } from '../../src/utils/config';
 
 export const pageUrl = '../build/index.html';
 
@@ -14,5 +13,5 @@ export const assertNoConsoleErrors = async (t: TestController) => {
 };
 
 export const cleanup = async () => {
-  await remove(join(homedir(), '.polar', 'networks'));
+  await remove(networksPath);
 };

src/shared/utils.ts

@@ -3,14 +3,18 @@ import log from 'electron-log';
 import { join } from 'path';
 import http from 'http';
 import https from 'https';
+import { existsSync } from 'fs';
 
 /**
  * setup logging to store log files in ~/.polar/logs/ dir
  */
 export const initLogger = () => {
   log.transports.file.resolvePath = (variables: log.PathVariables) => {
     const ap = app || remote.app;
-    return join(ap.getPath('home'), '.polar', 'logs', variables.fileName as string);
+    const home = ap.getPath('home');
+    const xdgPath = join(home, '.local', 'share', 'polar');
+    const dataPath = existsSync(xdgPath) ? xdgPath : join(home, '.polar');
+    return join(dataPath, 'logs', variables.fileName as string);
   };
 };
 

src/utils/config.ts

@@ -3,11 +3,19 @@ import { join } from 'path';
 import { NodeImplementation } from 'shared/types';
 import { Network } from 'types';
 import { dockerConfigs } from './constants';
+import { existsSync } from 'fs';
+
+/**
+ * XDG-compliant path where application data is stored
+ */
+export const xdgDataPath = join(remote.app.getPath('home'), '.local', 'share', 'polar');
 
 /**
  * root path where application data is stored
  */
-export const dataPath = join(remote.app.getPath('home'), '.polar');
+export const dataPath = existsSync(xdgDataPath)
+  ? xdgDataPath
+  : join(remote.app.getPath('home'), '.polar');
 
 /**
  * legacy path where application data was stored in v0.1.0
@@ -20,7 +28,7 @@ export const legacyDataPath = join(remote.app.getPath('userData'), 'data');
 export const networksPath = join(dataPath, 'networks');
 
 /**
- * returns a path to store dtat for an individual node
+ * returns a path to store data for an individual node
  */
 export const nodePath = (
   network: Network,