feat: autocompletion with omelette

.vscode/settings.json

@@ -19,6 +19,8 @@
     "helloworld",
     "importmap",
     "oneliner",
-    "stdlib"
+    "pcopy",
+    "stdlib",
+    "velociraptor"
   ]
 }

README.md

@@ -74,6 +74,27 @@ to see what else you can do with deno CLI use the help flag:
 $ denon --help
 ```
 
+## Autocompletion
+
+In **zsh**, you can install autocompletion with:
+
+```bash
+echo '. <(denon --completion)' >> ~/.zshrc
+```
+
+In **bash**:
+
+```bash
+denon --completion >> ~/.config/denon.completion.sh
+echo 'source ~/.config/denon.completion.sh' >> ~/.bash_profile
+```
+
+In **fish**:
+
+```bash
+echo 'denon --completion-fish | source' >> ~/.config/fish/config.fish
+```
+
 ## Configuration
 
 denon is designed to be simple but also extremely configurable to fit your project needs. It supports both json and yaml for the configuration file. The configuration options in yaml is the same as json making it compatible.

denon.ts

@@ -12,6 +12,7 @@ import {
   initializeConfig,
   grantPermissions,
   upgrade,
+  autocomplete,
 } from "./src/cli.ts";
 import { readConfig, DenonConfig } from "./src/config.ts";
 import { parseArgs } from "./src/args.ts";
@@ -100,6 +101,8 @@ if (import.meta.main) {
   const config = await readConfig(args.config);
   await setupLog(config);
 
+  autocomplete(config);
+
   config.args = args;
 
   // show help message.

deps.ts

@@ -49,3 +49,6 @@ export { deferred, delay } from "https://deno.land/std@0.52.0/async/mod.ts";
 
 // permission management
 export { grant } from "https://deno.land/std@0.52.0/permissions/mod.ts";
+
+// autocomplete
+export * as omelette from "https://deno.land/x/omelette/omelette.ts";

src/cli.ts

@@ -10,6 +10,7 @@ import {
   setColorEnabled,
   grant,
   exists,
+  omelette,
 } from "../deps.ts";
 
 import { DenonConfig, writeConfig, getConfigFilename } from "./config.ts";
@@ -96,6 +97,25 @@ export async function upgrade() {
   Deno.exit(0);
 }
 
+/**
+ * Generate autocomplete suggestions
+ */
+export function autocomplete(config: DenonConfig) {
+  // Write your CLI template.
+  const completion = omelette.default(`denon <script>`);
+
+  // Bind events for every template part.
+  completion.on('script', function ({ reply }: { reply: Function}) {
+    const auto = Object.keys(config.scripts); 
+    for (const file of Deno.readDirSync(Deno.cwd())) {
+      auto.push(file.name);
+    }
+    reply(auto);
+  });
+
+  completion.init();
+}
+
 /**
  * List all available scripts declared in the config file.
  * // TODO: make it interactive