lang/ruby: major refactor

+ Robe is now to be started manually.
+ Adds more keybindings for robe (including <localleader> ' for
  robe-start).
+ Use ruby-mode if ruby isn't available (e.g. editing ruby files on
  remote systems), enh-ruby-mode otherwise.
+ Added rake, bundler, rvm, rbenv and minitest packages
+ Added $RBENV_ROOT/shims to exec-path. This should fix rbenv support
  for the ruby version display in the modeline.

modules/lang/ruby/autoload.el

@@ -1,5 +1,8 @@
 ;;; lang/ruby/autoload.el -*- lexical-binding: t; -*-
 
+(defvar +ruby-version-cache (make-hash-table :test 'equal)
+  "TODO")
+
 ;;;###autoload
 (defun +ruby|cleanup-robe-servers ()
   "Clean up dangling inf robe processes if there are no more `enh-ruby-mode'
@@ -22,11 +25,28 @@ ruby executable found in your PATH).
 This is not necessarily aware of env management tools like virtualenv, pyenv or
 pipenv, unless those tools have modified the PATH that Emacs picked up when you
 started it."
-  (unless (executable-find "ruby")
-    (user-error "Couldn't find ruby executable in PATH"))
-  (with-temp-buffer
-    (let ((p (call-process "ruby" nil (current-buffer) nil "--version"))
-          (output (string-trim (buffer-string))))
-      (unless (zerop p)
-        (user-error "ruby --version failed: %s" output))
-      (nth 1 (split-string output " " t)))))
+  (condition-case _
+      (let ((version-str (car (process-lines "ruby" "--version"))))
+        (puthash (doom-project-root)
+                 (format "Ruby %s" (cadr (split-string version-str " ")))
+                 +ruby-version-cache))
+    (error "Ruby")))
+
+
+;;
+;; Hooks
+
+;;;###autoload
+(defun +ruby|update-version (&rest _)
+  "Update `+ruby--version' by consulting `+ruby-version' function."
+  (setq +ruby--version
+        (or (gethash (doom-project-root) +python-version-cache)
+            (+ruby-version))))
+
+;;;###autoload
+(defun +ruby|update-version-in-all-buffers ()
+  "Update `+ruby--version' in all `enh-ruby-mode' buffers."
+  (dolist (buffer (doom-buffers-in-mode 'enh-ruby-mode))
+    (setq +ruby-version-cache (clrhash +ruby-version-cache))
+    (with-current-buffer buffer
+      (+ruby|update-version))))