mescc: Out of the box Geiser support.

* .dir-locals.el: New file.  Out of the box Geiser support for mescc.

.dir-locals.el

@@ -0,0 +1,49 @@
+((nil
+  .
+  ((indent-tabs-mode . nil)
+   (eval
+    .
+    (progn
+      (let ((top (locate-dominating-file default-directory ".dir-locals.el"))))
+
+      (defun guile--manual-look-up (id mod)
+        (message "guile--manual-look-up id=%s => %s mod=%s" id (symbol-name id) mod)
+        (let ((info-lookup-other-window-flag
+               geiser-guile-manual-lookup-other-window-p))
+          (info-lookup-symbol (symbol-name id) 'scheme-mode))
+        (when geiser-guile-manual-lookup-other-window-p
+          (switch-to-buffer-other-window "*info*"))
+        (search-forward (format "%s" id) nil t))
+
+      (add-hook 'before-save-hook 'delete-trailing-whitespace nil t)
+
+      (defun guix-switch-profile (&optional profile)
+        "reset Emacs' environment by snarfing PROFILE/etc/profile"
+
+        (defun matches-in-string (regexp string)
+          "return a list of matches of REGEXP in STRING."
+          (let ((matches))
+            (save-match-data
+              (string-match "^" "")
+              (while (string-match regexp string (match-end 0))
+                (push (or (match-string 1 string) (match-string 0 string)) matches)))
+            matches))
+
+        (interactive "fprofile: ")
+        (let* ((output (shell-command-to-string (concat "GUIX_PROFILE= /bin/sh -x " profile "/etc/profile")))
+               (exports (matches-in-string "^[+] export \\(.*\\)" output)))
+          (mapcar (lambda (line) (apply #'setenv (split-string line "="))) exports )))
+))))
+ (scheme-mode
+  .
+  ((geiser-active-implementations . (guile))
+   (eval
+    .
+    (progn
+      (defun prefix-dir-locals-dir (elt)
+        (concat (locate-dominating-file buffer-file-name ".dir-locals.el") elt))
+      (mapcar
+       (lambda (dir) (add-to-list 'geiser-guile-load-path dir))
+       (mapcar
+        #'prefix-dir-locals-dir
+        '("scripts" "guile"))))))))