There is a bug in "scheme → elisp" conversion in the emacs interface.
It can be seen with the following recipe:
1. M-x guix-licenses
2. Move to "FreeBSD" license and press "i" to describe it.
3. In the *Guix License Info* buffer you can see:
https://www.gnu.org/licenses/license-listnilreeBSD
while it should be:
https://www.gnu.org/licenses/license-list#FreeBSD
As you can see, "#F" is replaced with "nil". The problem is: we receive
a string with scheme expression from geiser, and it should be converted
into elisp expression. I don't see how to do it other than just to
replace scheme specific things (#t, #f, #<unspecified>) with elisp
analogs in this raw string.
The attached patch improves this conversion process, but it is still
ugly. Are there better ideas how to perform this conversion?
>From f127fc2ac741334340b650736b98ed15879a3be1 Mon Sep 17 00:00:00 2001
From: Alex Kost <alez...@gmail.com>
Date: Sun, 24 Jan 2016 11:16:44 +0300
Subject: [PATCH] emacs: Fix converting scheme into elisp expression.
* emacs/guix-geiser.el (guix-geiser-eval-read): Replace #f/#t with nil/t
only when they follow "(" or " ".
---
emacs/guix-geiser.el | 22 +++++++++++++++++-----
1 file changed, 17 insertions(+), 5 deletions(-)
diff --git a/emacs/guix-geiser.el b/emacs/guix-geiser.el
index 0e6cc03..833f5bb 100644
--- a/emacs/guix-geiser.el
+++ b/emacs/guix-geiser.el
@@ -46,11 +46,23 @@ Return a list of strings with result values of evaluation."
(defun guix-geiser-eval-read (str &optional repl)
"Evaluate STR with guile expression using Geiser REPL.
Return elisp expression of the first result value of evaluation."
- ;; Parsing scheme code with elisp `read' is probably not the best idea.
- (read (replace-regexp-in-string
- "#f\\|#<unspecified>" "nil"
- (replace-regexp-in-string
- "#t" "t" (car (guix-geiser-eval str repl))))))
+ ;; The goal is to convert a string with scheme expression into elisp
+ ;; expression.
+ (let ((result (car (guix-geiser-eval str repl))))
+ (cond
+ ((or (string= result "#f")
+ (string= result "#<unspecified>"))
+ nil)
+ ((string= result "#t")
+ t)
+ (t
+ (read (replace-regexp-in-string
+ "[ (]\\(#f\\)" "nil"
+ (replace-regexp-in-string
+ "[ (]\\(#t\\)" "t"
+ result
+ nil nil 1)
+ nil nil 1))))))
(defun guix-repl-send (cmd &optional save-history)
"Send CMD input string to the current REPL buffer.
--
2.6.3
