Add Rails support to Ruby module

The +rails flag sets up projectile-rails as a minor mode for
enh-ruby-mode and, if enabled under :lang, web-mode. Projectile-rails
keybindings are under "<localleader> r".

robe-rails-refresh was moved to "<localleader> R".

docs/modules.org

@@ -131,7 +131,7 @@ Modules that bring support for a language or group of languages to Emacs.
 + qt - TODO
 + racket - TODO
 + [[file:../modules/lang/rest/README.org][rest]] - TODO
-+ ruby =+lsp +rvm +rbenv= - TODO
++ ruby =+lsp +rvm +rbenv +rails= - TODO
 + [[file:../modules/lang/rust/README.org][rust]] =+lsp= - TODO
 + scala =+lsp= - TODO
 + [[file:../modules/lang/scheme/README.org][scheme]] - TODO

modules/lang/ruby/config.el

@@ -63,7 +63,7 @@
         "'"  #'robe-start
         ;; robe mode specific
         "h"  #'robe-doc
-        "rr" #'robe-rails-refresh
+        "R" #'robe-rails-refresh
         ;; inf-enh-ruby-mode
         :prefix "s"
         "d"  #'ruby-send-definition
@@ -168,3 +168,20 @@
         "a" #'minitest-verify-all
         "s" #'minitest-verify-single
         "v" #'minitest-verify))
+
+
+(use-package! projectile-rails
+  :when (featurep! +rails)
+  :hook (enh-ruby-mode . projectile-rails-mode)
+  :init
+  (when (featurep! :lang web)
+    (add-hook 'web-mode-hook #'projectile-rails-mode))
+  :config
+  (when (featurep! :editor evil)
+    (add-hook 'projectile-rails-mode-hook #'evil-normalize-keymaps))
+  (map! :localleader
+        :map projectile-rails-mode-map
+        "r" #'projectile-rails-command-map)
+  (push '((nil . "projectile-rails-\\(.+\\)") . (nil . "\\1"))
+        which-key-replacement-alist)
+  (set-popup-rule! "^\\*\\(projectile-\\)?rails" :ttl nil))

modules/lang/ruby/packages.el

@@ -27,3 +27,8 @@
 ;; Testing frameworks
 (package! rspec-mode :pin "c4353a1bff")
 (package! minitest :pin "6d9f6233b7")
+
+;; Rails
+(when (featurep! +rails)
+  (package! projectile-rails :pin "228f631")
+  (package! inflections :pin "e4f1372"))