Add +roam submodule to lang/org

Closes #2764, #2759

modules/lang/org/README.org

@@ -67,6 +67,7 @@ https://www.mfoot.com/blog/2015/11/22/literate-emacs-configuration-with-org-mode
 + =+pomodoro= Enables a pomodoro timer for clocking time on tasks.
 + =+present= Enables integration with reveal.js, beamer and org-tree-slide, so
   Emacs can be used for presentations.
++ =+roam= Enables org-roam integration.
 
 ** Plugins
 + [[https://github.com/hniksic/emacs-htmlize][htmlize]]

modules/lang/org/config.el

@@ -936,6 +936,7 @@ compelling reason, so..."
   (if (featurep! +jupyter)   (load! "contrib/jupyter"))
   (if (featurep! +pomodoro)  (load! "contrib/pomodoro"))
   (if (featurep! +present)   (load! "contrib/present"))
+  (if (featurep! +roam)      (load! "contrib/roam"))
 
   ;; In case the user has eagerly loaded org from their configs
   (when (and (featurep 'org)

modules/lang/org/contrib/roam.el

@@ -0,0 +1,36 @@
+;;; lang/org/contrib/roam.el -*- lexical-binding: t; -*-
+;;;###if (featurep! +roam)
+
+(use-package! org-roam
+  :commands (org-roam
+             org-roam-insert
+             org-roam-find-file
+             org-roam-switch-to-buffer
+             org-roam-show-graph)
+  :init
+  (map! :after org
+        :map org-mode-map
+        :localleader
+        :prefix ("m" . "org-roam")
+        "m" #'org-roam
+        "i" #'org-roam-insert
+        "b" #'org-roam-switch-to-buffer
+        "f" #'org-roam-find-file
+        "g" #'org-roam-show-graph
+        "i" #'org-roam-insert)
+  :config
+  (setq org-roam-directory org-directory)
+  (org-roam-mode +1))
+
+
+;; Since the org module lazy loads org-protocol (waits until an org URL is
+;; detected), we can safely chain `org-roam-protocol' to it.
+(use-package! org-roam-protocol
+  :after org-protocol)
+
+
+(use-package company-org-roam
+  :when (featurep! :completion company)
+  :after org-roam
+  :config
+  (set-company-backend! 'org-mode '(company-org-roam company-yasnippet company-dabbrev)))

modules/lang/org/packages.el

@@ -73,6 +73,10 @@
   (package! ox-reveal :pin "ea8b502170"))
 (when (featurep! +journal)
   (package! org-journal :pin "664c08e12c"))
+(when (featurep! +roam)
+  (package! org-roam :pin "b86d2c8637")
+  (when (featurep! :completion company)
+    (package! company-org-roam :pin "0d14bf56f5")))
 
 ;;; Babel
 (package! ob-async :pin "80a30b96a0")