Add --help-env command

CHANGELOG.md

@@ -7,6 +7,7 @@ Please, check out guidelines: https://keepachangelog.com/en/1.0.0/
 ### Added
 
 - Install command https://github.com/tuist/tuist/pull/83 by @pepibumur.
+- `--help-env` command to tuistenv by @pepibumur.
 
 ## 0.1.0
 

Sources/TuistEnvKit/Commands/CommandRegistry.swift

@@ -43,7 +43,9 @@ public final class CommandRegistry {
 
     public func run() {
         do {
-            if let parsedArguments = try parse() {
+            if processArguments().dropFirst().first == "--help-env" {
+                parser.printUsage(on: stdoutStream)
+            } else if let parsedArguments = try parse() {
                 try process(arguments: parsedArguments)
             } else {
                 try commandRunner.run()