tools/magit: gate magithub behind +hub flag

Use +magit-hub-features to customize which features to load. Set it to
`t` to load all features.

init.example.el

@@ -56,7 +56,7 @@
       ;gist              ; interacting with github gists
       ;macos             ; MacOS-specific commands
       ;make              ; run make tasks from Emacs
-      ;magit             ;
+      ;(magit +hub)      ;
       ;password-store    ; password manager for nerds
        pdf               ; pdf enhancements
       ;prodigy           ; FIXME managing external services & code builders

modules/tools/magit/config.el

@@ -1,5 +1,14 @@
 ;;; tools/magit/config.el -*- lexical-binding: t; -*-
 
+(defvar +magit-hub-features
+  '(pull-request-merge commit-browse completion)
+  "TODO")
+
+
+;;
+;; Plugins
+;;
+
 (def-package! magit
   :defer t
   :config
@@ -20,6 +29,7 @@
 
 
 (def-package! magithub
+  :when (featurep! +hub)
   :after magit
   :preface
   (setq magithub-dir (concat doom-etc-dir "magithub/"))
@@ -27,7 +37,7 @@
   (setq magithub-clone-default-directory "~/"
         magithub-preferred-remote-method 'clone_url)
   :config
-  (magithub-feature-autoinject t))
+  (magithub-feature-autoinject +magit-hub-features))
 
 
 (def-package! magit-gitflow

modules/tools/magit/packages.el

@@ -2,7 +2,8 @@
 ;;; tools/magit/packages.el
 
 (when (package! magit)
-  (package! magithub)
   (package! magit-gitflow)
+  (when (featurep! +hub)
+    (package! magithub))
   (when (featurep! :feature evil)
     (package! evil-magit)))