geiser-squarify to toggle between () and []

4 files changed, 27 insertions, 0 deletions

diff --git a/README b/README
index 8134f97..b10af2a 100644
--- a/README
+++ b/README
@@ -111,6 +111,7 @@
     | M-.                 | Go to definition of identifier at point         |
     | M-,                 | Go back to where M-. was last invoked           |
     | C-c C-e m           | Ask for a module and open its file              |
+    | C-c C-e [           | Toggle between () and [] for current form       |
     |---------------------+-------------------------------------------------|
     | C-M-x               | Eval definition around point                    |
     | C-c M-e             | Eval definition around point and switch to REPL |
diff --git a/doc/cheat.texi b/doc/cheat.texi
index adcc4d8..4e81b92 100644
--- a/doc/cheat.texi
+++ b/doc/cheat.texi
@@ -31,6 +31,9 @@
 @item C-c C-e C-m
 @tab geiser-edit-module
 @tab Ask for a module and open its file
+@item C-c C-e C-[
+@tab geiser-squarify
+@tab Toggle between () and [] for current form
 @item @tab @tab
 @item C-M-x
 @tab geiser-eval-definition
diff --git a/doc/parens.texi b/doc/parens.texi
index 9ce0d05..9839892 100644
--- a/doc/parens.texi
+++ b/doc/parens.texi
@@ -482,6 +482,10 @@ try to find a module name that matches it. You can also request
 explicitly completion only over module names using @kbd{M-`} (that's a
 backtick).
 
+There's also this little command, @code{geiser-squarify}, which will
+toggle the delimiters of the innermost list around point between round
+and square brackets. It is bound to @key{C-c C-e [}.
+
 @c Local Variables:
 @c mode: texinfo
 @c TeX-master: "geiser"
diff --git a/elisp/geiser-mode.el b/elisp/geiser-mode.el
index e9e5563..3575474 100644
--- a/elisp/geiser-mode.el
+++ b/elisp/geiser-mode.el
@@ -176,6 +176,24 @@ With prefix, try to enter the current's buffer module."
     (goto-char (point-max))
     (pop-to-buffer b)))
 
+(defun geiser-squarify ()
+  "Toggle between () and [] for current form."
+  (interactive)
+  (let ((pared (and (boundp 'paredit-mode) paredit-mode)))
+    (when pared (paredit-mode -1))
+    (unwind-protect
+        (save-excursion
+          (unless (looking-at-p "\\s(") (backward-up-list))
+          (let ((p (point))
+                (round (looking-at-p "(")))
+            (forward-sexp)
+            (backward-delete-char 1)
+            (insert (if round "]" ")"))
+            (goto-char p)
+            (delete-char 1)
+            (insert (if round "[" "("))))
+      (when pared (paredit-mode 1)))))
+
 
 ;;; Geiser mode:
 
@@ -258,6 +276,7 @@ interacting with the Geiser REPL is at your disposal.
   ("Complete module name" ((kbd "M-`") (kbd "C-."))
    geiser-completion--complete-module)
   ("Edit module" ("\C-c\C-e\C-m" "\C-c\C-em") geiser-edit-module)
+  ("Toggle ()/[]" ("\C-c\C-e\C-[" "\C-c\C-e[") geiser-squarify)
   --
   ("Callers" ((kbd "C-c <")) geiser-xref-callers
    :enable (and (geiser-eval--supported-p 'callers) (symbol-at-point)))