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custom-save-variables: pretty-printing long values
From: |
Adam Spiers |
Subject: |
custom-save-variables: pretty-printing long values |
Date: |
Thu, 11 Apr 2013 16:51:29 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
This simple tweak to cus-edit ensures that custom variable values
which are over 60 bytes long get written to `custom-file' using
`indent-pp-sexp'. For example:
(custom-set-variables
;; custom-set-variables was added by Custom.
;; If you edit it by hand, you could mess it up, so be careful.
;; Your init file should contain only one such instance.
;; If there is more than one, they won't work right.
[snipped]
'(c-default-style
(quote
((c-mode . "linux")
(java-mode . "java")
(awk-mode . "awk")
(other . "gnu"))))
This not only makes the file much easier to read, but is particularly
useful when the file is tracked by a version control system, since
then the diffs become much more manageable. For example, my setting
for `org-agenda-custom-commands' is 349 lines long (14989 characters).
When I recustomise that variable, the output of `git diff' is
almost completely illegible.
Are there any problems with this approach?
Thanks!
Adam
diff --git a/lisp/cus-edit.el b/lisp/cus-edit.el
index 4ed72be..673ea44 100644
--- a/lisp/cus-edit.el
+++ b/lisp/cus-edit.el
@@ -4590,7 +4590,15 @@ This function does not save the buffer."
(princ " '(")
(prin1 symbol)
(princ " ")
- (prin1 (car value))
+ (let ((val (prin1-to-string (car value))))
+ (if (< (length val) 60)
+ (insert val)
+ (newline-and-indent)
+ (let ((beginning-of-val (point)))
+ (insert val)
+ (save-excursion
+ (goto-char beginning-of-val)
+ (indent-pp-sexp 1)))))
(when (or now requests comment)
(princ " ")
(prin1 now)
- custom-save-variables: pretty-printing long values,
Adam Spiers <=