feat: REPLs, by major mode, by project

Also includes Doom's popup code. }:)

users/crumb/programs/emacs/modules/lang/syd-lang-emacs-lisp.el

@@ -0,0 +1,26 @@
+;;; emacs-lisp.el -*- lexical-binding: t; -*-
+
+(require 'syd-handle-repl)
+
+(use-package ielm
+  :hook (emacs-lisp-mode)
+  :custom ((ielm-history-file-name ; Stay out of my config dir!
+            (file-name-concat syd-cache-dir "ielm-history.eld")))
+  :config
+  (defun syd/open-emacs-lisp-repl ()
+    (interactive)
+    (pop-to-buffer
+     (or (get-buffer "*ielm*")
+         (progn (ielm) ; Creates the *ielm* buffer.
+                (let ((b (get-buffer "*ielm*")))
+                  ;; We leave it to the enclosing `pop-to-buffer' to display the
+                  ;; buffer.
+                  (bury-buffer b)
+                  b)))))
+
+  (add-to-list '+syd-major-mode-repl-alist
+               '(emacs-lisp-mode syd/open-emacs-lisp-repl))
+
+  (pp +popup-defaults))
+
+(provide 'syd-lang-emacs-lisp)