fix: move ctor for command help class to its own function (#244)

* fix: move ctor for command help class to its own function

@W-9708749@

* chore: add property to capture original argv

* chore: apply review comments

src/help/index.ts

@@ -90,6 +90,8 @@ export class Help extends HelpBase {
   }
 
   public async showHelp(argv: string[]) {
+    argv = argv.filter(arg => !getHelpFlagAdditions(this.config).includes(arg))
+
     if (this.config.topicSeparator !== ':') argv = standardizeIDFromArgv(argv, this.config)
     const subject = getHelpSubject(argv, this.config)
     if (!subject) {
@@ -202,10 +204,14 @@ export class Help extends HelpBase {
       command.id = command.id.replace(/:/g, this.config.topicSeparator)
       command.aliases = command.aliases && command.aliases.map(a => a.replace(/:/g, this.config.topicSeparator))
     }
-    const help = new this.CommandHelpClass(command, this.config, this.opts)
+    const help = this.getCommandHelpClass(command)
     return help.generate()
   }
 
+  protected getCommandHelpClass(command: Interfaces.Command) {
+    return new this.CommandHelpClass(command, this.config, this.opts)
+  }
+
   protected formatCommands(commands: Interfaces.Command[]): string {
     if (commands.length === 0) return ''
 

src/main.ts

@@ -51,7 +51,6 @@ export async function run(argv = process.argv.slice(2), options?: Interfaces.Loa
 
   // display help version if applicable
   if (helpAddition(argv, config)) {
-    argv = argv.filter(arg => !getHelpFlagAdditions(config).includes(arg))
     const Help = await loadHelpClass(config)
     const help = new Help(config, config.pjson.helpOptions)
     await help.showHelp(argv)