Add drenv setup command

Various minor fixes.

commands/new.ts

@@ -4,7 +4,7 @@ import { readVersion } from "../utils/read-version.ts";
 
 import global from "./global.ts";
 
-export default async function newCommand(name: string | undefined = undefined) {
+export default async function newCommand(name: string) {
   return copy(
     `${Deno.env.get("HOME")}/.drenv/versions/${await global()}`,
     name,

commands/register.ts

@@ -1,6 +1,8 @@
+import { move } from "jsr:@std/fs";
+
 import { readVersion } from "../utils/read-version.ts";
 
-export default async function register(path: string | undefined = undefined) {
+export default async function register(path: string) {
   // TODO: Validate that directory is a DragonRuby installation
 
   const version = await readVersion(path + "/CHANGELOG-CURR.txt");

commands/setup.ts

@@ -0,0 +1,25 @@
+import { exists, move } from "jsr:@std/fs";
+
+export default async function setup() {
+  const binPath = `${Deno.env.get("HOME")}/.drenv/bin/drenv`;
+  const shell = Deno.env.get("SHELL");
+
+  if (await exists(binPath)) {
+    return "drenv: already installed";
+  } else {
+    if (!Deno.execPath().includes("drenv")) {
+      return "drenv: this command must be run from the drenv executable"
+    }
+
+    await move(Deno.execPath(), binPath);
+
+    console.log(`Installed at ${binPath}\n`);
+    console.log(`Run the following to add drenv to your shell profile:\n`);
+
+    if (shell?.includes("zsh")) {
+      console.log(`echo 'export PATH="$HOME/.drenv/bin:$PATH"' >> ~/.zshrc && source ~/.zshrc`);
+    } else if (shell?.includes("bash")) {
+      console.log(`echo 'export PATH="$HOME/.drenv/bin:$PATH"' >> ~/.bashrc && source ~/.bashrc`);
+    }
+  }
+}

deno.json

@@ -1,6 +1,7 @@
 {
   "tasks": {
-    "dev": "deno run --watch main.ts"
+    "dev": "deno run --watch main.ts",
+    "compile": "deno compile -A --output=builds/drenv main.ts"
   },
   "imports": {
     "@std/assert": "jsr:@std/assert@1",

main.ts

@@ -4,6 +4,7 @@ import global from "./commands/global.ts";
 import local from "./commands/local.ts";
 import newCommand from "./commands/new.ts";
 import register from "./commands/register.ts";
+import setup from "./commands/setup.ts";
 import versions from "./commands/versions.ts";
 
 const program = new Command();
@@ -24,7 +25,11 @@ const actionRunner = (fn: (...args: any[]) => Promise<any>) => {
 program
   .name("drenv")
   .description("CLI to manage DragonRuby environments.")
-  .version("0.2.0");
+  .version("0.2.1");
+
+program.command("setup")
+  .description("Setup your shell profile to use drenv.")
+  .action(actionRunner(setup));
 
 program.command("new")
   .argument("<name>", "Name of the new project")
@@ -44,7 +49,7 @@ program.command("global")
   .action(actionRunner(global));
 
 program.command("local")
-  .argument("[version]", "Version of DragonRuby to use")
+  .argument("<version>", "Version of DragonRuby to use")
   .description("Get or set the local version of DragonRuby.")
   .action(actionRunner(local));
 

utils/read-version.ts

@@ -1,6 +1,8 @@
 import { readFirstLine } from "./read-first-line.ts";
 
-export const readVersion = async (path: string): Promise<string> => {
+export const readVersion = async (
+  path: string,
+): Promise<string | undefined> => {
   let currentVersion;
 
   try {