Re: [O] [PATCH] Add `org-reverse-string'

[Eric Schulte]

This patch looks fine to me, although you'll need to add a
`declare-function' call to the top of ob-core.el (and maybe to org-id as
well) or the compiler will complain.

Daimrod <address@hidden> writes:

> I needed a `reverse-string' function and I've found two in Org Mode.
> `org-babel-reverse-string' and `org-id-reverse-string'. So instead of
> rolling my own (I'm playing with `org-contacts.el'), I think it would
> be better to unify those functions into one.
>
>
> From e058c4fac767a5faffd8debaabc489c174eef583 Mon Sep 17 00:00:00 2001
> From: =?UTF-8?q?Gr=C3=A9goire=20Jadi?= <address@hidden>
> Date: Sat, 26 Jan 2013 21:12:54 +0100
> Subject: [PATCH] Unify `org-id-reverse-string' and `org-babel-reverse-string'
>  into `org-reverse-string'
>
> * lisp/org.el (org-reverse-string): Add `org-reverse-string' to
>   reverse a string.
> * lisp/org-id.el: Replace `org-id-reverse-string' by
>   `org-reverse-string'.
> * lisp/ob-core.el: Replace `org-babel-reverse-string' by `org-reverse-string'
>
> TINYCHANGE
> ---
>  lisp/ob-core.el |    8 ++------
>  lisp/org-id.el  |    7 ++-----
>  lisp/org.el     |    4 ++++
>  3 files changed, 8 insertions(+), 11 deletions(-)
>
> diff --git a/lisp/ob-core.el b/lisp/ob-core.el
> index 9e4c8b1..0a495d0 100644
> --- a/lisp/ob-core.el
> +++ b/lisp/ob-core.el
> @@ -2495,10 +2495,6 @@ If the table is trivial, then return it as a scalar."
>                             (match-string 1 cell))
>                        cell) t))
>  
> -(defun org-babel-reverse-string (string)
> -  "Return the reverse of STRING."
> -  (apply 'string (reverse (string-to-list string))))
> -
>  (defun org-babel-chomp (string &optional regexp)
>    "Strip trailing spaces and carriage returns from STRING.
>  Default regexp used is \"[ \f\t\n\r\v]\" but can be
> @@ -2513,8 +2509,8 @@ overwritten by specifying a regexp as a second 
> argument."
>    "Strip leading and trailing spaces and carriage returns from STRING.
>  Like `org-babel-chomp' only it runs on both the front and back
>  of the string."
> -  (org-babel-chomp (org-babel-reverse-string
> -                    (org-babel-chomp (org-babel-reverse-string string) 
> regexp))
> +  (org-babel-chomp (org-reverse-string
> +                    (org-babel-chomp (org-reverse-string string) regexp))
>                     regexp))
>  
>  (defvar org-babel-org-babel-call-process-region-original nil)
> diff --git a/lisp/org-id.el b/lisp/org-id.el
> index b35ea5e..bb503bd 100644
> --- a/lisp/org-id.el
> +++ b/lisp/org-id.el
> @@ -343,7 +343,7 @@ So a typical ID could look like \"Org:4nd91V40HI\"."
>        (unless (org-uuidgen-p unique)
>       (setq unique (org-id-uuid))))
>       ((eq org-id-method 'org)
> -      (let* ((etime (org-id-reverse-string (org-id-time-to-b36)))
> +      (let* ((etime (org-reverse-string (org-id-time-to-b36)))
>            (postfix (if org-id-include-domain
>                         (progn
>                           (require 'message)
> @@ -376,9 +376,6 @@ So a typical ID could look like \"Org:4nd91V40HI\"."
>           (substring rnd 18 20)
>           (substring rnd 20 32))))
>  
> -(defun org-id-reverse-string (s)
> -  (mapconcat 'char-to-string (nreverse (string-to-list s)) ""))
> -
>  (defun org-id-int-to-b36-one-digit (i)
>    "Turn an integer between 0 and 61 into a single character 0..9, A..Z, 
> a..z."
>    (cond
> @@ -432,7 +429,7 @@ and time is the usual three-integer representation of 
> time."
>      (if (= 2 (length parts))
>       (setq prefix (car parts) time (nth 1 parts))
>        (setq prefix nil time (nth 0 parts)))
> -    (setq time (org-id-reverse-string time))
> +    (setq time (org-reverse-string time))
>      (setq time (list (org-id-b36-to-int (substring time 0 4))
>                    (org-id-b36-to-int (substring time 4 8))
>                    (org-id-b36-to-int (substring time 8 12))))
> diff --git a/lisp/org.el b/lisp/org.el
> index 5033cbf..65c8c60 100644
> --- a/lisp/org.el
> +++ b/lisp/org.el
> @@ -21038,6 +21038,10 @@ for the search purpose."
>               (error "Unable to create a link to here"))))
>      (org-occur-in-agenda-files (regexp-quote link))))
>  
> +(defun org-reverse-string (string)
> +  "Return the reverse of STRING."
> +  (apply 'string (reverse (string-to-list string))))
> +
>  (defun org-uniquify (list)
>    "Remove duplicate elements from LIST."
>    (let (res)
> -- 
> 1.7.10.4

-- 
Eric Schulte
http://cs.unm.edu/~eschulte