Move lang/org => org/*

Since lang/org has grown (and is expected to grow much, much more), it
has been given its own module category.

Concerns #129, #138

modules/org/org-export/config.el

@@ -0,0 +1,35 @@
+;;; org/org-export/config.el -*- lexical-binding: t; -*-
+
+(add-hook 'org-load-hook #'+org-export|init t)
+
+;; I don't have any beef with org's built-in export system, but I do wish it
+;; would export to a central directory, rather than `default-directory'. This is
+;; because all my org files are usually in one place, and I want to be able to
+;; refer back to old exports if needed.
+
+(def-package! ox-pandoc
+  :config
+  (unless (executable-find "pandoc")
+    (warn "org-export: couldn't find pandoc, disabling pandoc export"))
+  (setq org-pandoc-options
+        '((standalone . t)
+          (mathjax . t)
+          (parse-raw . t))))
+
+;;
+(defun +org-export|init ()
+  (setq org-export-directory (expand-file-name ".export" +org-dir)
+        org-export-backends '(ascii html latex md)
+        org-export-with-toc t
+        org-export-with-author t)
+
+  ;; Always export to a central location
+  (unless (file-directory-p org-export-directory)
+    (make-directory org-export-directory t))
+  (defun +org*export-output-file-name (args)
+    "Return a centralized export location."
+    (unless (nth 2 args)
+      (setq args (append args (list org-export-directory))))
+    args)
+  (advice-add #'org-export-output-file-name
+              :filter-args #'+org*export-output-file-name))