chore: improve development cycle

When running npm run dev, we now optionally output to a given Obsidian
vault controlled by the VITE_OBSIDIAN_VAULT environment variable. This
can be set by .env.local in the plugin/ dir.

.gitignore

@@ -1,7 +1,2 @@
-# Plugin things
-plugin/node_modules/
-plugin/dist/
-
-# Nix-related things
 .direnv/
 .devenv/

plugin/.gitignore

@@ -0,0 +1,3 @@
+node_modules/
+dist/
+.env.local

plugin/package.json

@@ -4,7 +4,7 @@
   "description": "A Todoist plugin for Obsidian",
   "scripts": {
     "check": "svelte-check",
-    "dev": "npm run check && vite build",
+    "dev": "npm run check && VITE_ENV=dev vite build",
     "build": "vite build",
     "test": "vitest",
     "format": "prettier --write src/**/*",

plugin/vite.config.mts

@@ -1,7 +1,22 @@
 import { configDefaults, defineConfig } from 'vitest/config'
 import { svelte } from '@sveltejs/vite-plugin-svelte'
 import { viteStaticCopy } from 'vite-plugin-static-copy'
-import { resolve } from 'path'
+import path, { resolve } from 'path'
+import { loadEnv } from 'vite'
+
+function getOutDir(): string | undefined {
+  const env = loadEnv("prod", process.cwd());
+  if (env?.VITE_ENV !== "dev") {
+    return undefined;
+  }
+
+  const vaultDir = env?.VITE_OBSIDIAN_VAULT;
+  if (vaultDir === undefined) {
+    return vaultDir;
+  }
+
+  return path.join(vaultDir, ".obsidian", "plugins", "todoist-sync-plugin");
+}
 
 export default defineConfig({
   plugins: [
@@ -31,7 +46,8 @@ export default defineConfig({
     },
     rollupOptions: {
       external: ["obsidian"]
-    }
+    },
+    outDir: getOutDir(),
   },
   test: {
     watch: false,