feat: generalize help coordination inot showHelp()

src/commands/help.ts

@@ -1,5 +1,4 @@
 import {Command, flags} from '@anycli/command'
-import cli from 'cli-ux'
 
 import Help from '..'
 
@@ -14,18 +13,9 @@ export default class HelpCommand extends Command {
   ]
 
   async run() {
-    const {flags, args} = this.parse(HelpCommand)
+    const {flags, argv} = this.parse(HelpCommand)
     const format = flags.format as any || 'screen'
-    let id = args.command
     let help = new Help(this.config, {format})
-    if (!id) {
-      let rootHelp = help.root()
-      cli.info(rootHelp)
-    } else {
-      let command = this.config.findCommand(id, {must: true})
-      let commandHelp = help.command(command)
-      cli.info(commandHelp)
-    }
-    if (format === 'screen') cli.info()
+    help.showHelp(argv)
   }
 }

src/index.ts

@@ -47,12 +47,24 @@ export interface HelpOptions {
 export default class Help {
   constructor(public config: Config.IConfig, public opts: HelpOptions = {}) {}
 
-  showHelp(command: Config.Command.Class, _: string[]) {
-    // if (command.type === 'engine') {
-    //   cli.info(this.root())
-    // } else {
-      cli.info(this.command(Config.Command.toCached(command)))
-    // }
+  showHelp(argv: string[]) {
+    const getHelpSubject = () => {
+      for (let arg of argv) {
+        if (arg === '--') return
+        if (arg.startsWith('-')) continue
+        if (arg === 'help') continue
+        return arg
+      }
+    }
+    const subject = getHelpSubject()
+    if (!subject) {
+      cli.info(this.root())
+    } else {
+      // TODO: topic help
+      let command = this.config.findCommand(subject, {must: true})
+      cli.info(this.command(command))
+    }
+    if (this.opts.format === 'screen') cli.info()
   }
 
   root(): string {