[PATCH] ob-lilypond: allow user configuration of header-args

[PATCH] ob-lilypond: allow user configuration of header-args

[Jamie Bayne]

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Hi all,

I hit the problem described in
https://www.mail-archive.com/emacs-orgmode@gnu.org/msg127317.html - I
couldn't see that anyone else had fixed it so I had a go.

The problem is that, unusually, ob-lilypond has some conditional logic on
its header-args. Its solution is to set the header-args internally when
required, which overrides any user-specified value.

The quickest way I could see to preserve the conditional logic was to add a
new variable to hold the user configuration, which I called
ob-lilypond-header-args. Now the conditional logic sets
org-babel-header-args:lilypond to the new variable's value when appropriate.

Another way would be to create a context which sets the variable when
needed and then resets it. I opted against this as I'm not sure it would
have the same behaviour in all cases. Happy to have a go if it would be
preferable, though.

Cheers,
Jamie

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From f413a36ac9b7ca7c990ee1ab6456cc237ebccf3d Mon Sep 17 00:00:00 2001
From: Jamie Bayne <jamiebayne@hotmail.com>
Date: Sat, 2 Jan 2021 02:18:37 +0000
Subject: [PATCH] Allow user to set ob-lilypond header arguments

* ob-lilypond.el (org-babel-lilypond-set-header-args): Replace
hard-coded settings with user-configurable variable.
(org-babel-header-args:lilypond): Modify documentation.
(ob-lilypond-header-args): New variable.

TINYCHANGE
---
 lisp/ob-lilypond.el | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/lisp/ob-lilypond.el b/lisp/ob-lilypond.el
index fbdd905a5..11ae9ae88 100644
--- a/lisp/ob-lilypond.el
+++ b/lisp/ob-lilypond.el
@@ -43,6 +43,15 @@
 (defvar org-babel-default-header-args:lilypond '()
   "Default header arguments for lilypond code blocks.
 NOTE: The arguments are determined at lilypond compile time.
+See `org-babel-lilypond-set-header-args'
+To configure, see `ob-lilypond-header-args'
+.")
+
+(defvar ob-lilypond-header-args
+  '((:results . "file") (:exports . "results"))
+  "User-configurable header arguments for lilypond code blocks.
+NOTE: The final value used by org-babel is computed at compile-time
+and stored in  `org-babel-default-header-args:lilypond'
 See `org-babel-lilypond-set-header-args'.")
 
 (defvar org-babel-lilypond-compile-post-tangle t
@@ -403,9 +412,8 @@ These depend upon whether we are in Arrange mode i.e. MODE is t."
            (:results . "silent")
            (:cache . "yes")
            (:comments . "yes")))
-        (t
-         '((:results . "file")
-           (:exports . "results")))))
+        (t 
+          ob-lilypond-header-args)))
 
 (defun org-babel-lilypond-set-header-args (mode)
   "Set org-babel-default-header-args:lilypond
-- 
2.29.2

Re: [PATCH] ob-lilypond: allow user configuration of header-args

[Jonathan Gregory]

Hi Jamie

On 10 Jan 2021, Jamie Bayne wrote:

> Hi all,
>
> I hit the problem described in 
> https://www.mail-archive.com/emacs-orgmode@gnu.org/msg127317.html 
> - I couldn't see that anyone else had fixed it so I had a go.
>
> The problem is that, unusually, ob-lilypond has some conditional 
> logic on its header-args. Its solution is to set the header-args 
> internally when required, which overrides any user-specified 
> value.
>
> The quickest way I could see to preserve the conditional logic 
> was to add a new variable to hold the user configuration, which 
> I called ob-lilypond-header-args. Now the conditional logic sets 
> org-babel-header-args:lilypond to the new variable's value when 
> appropriate.
>
> Another way would be to create a context which sets the variable 
> when needed and then resets it. I opted against this as I'm not 
> sure it would have the same behaviour in all cases. Happy to 
> have a go if it would be preferable, though.
>
> Cheers, Jamie

I'm not sure I understand the second proposal. Either way, the 
solution looks reasonable.

Thanks for your help

-- 
Jonathan

Re: [PATCH] ob-lilypond: allow user configuration of header-args

[Bastien]

Hi Jamie,

thanks for the patch, I applied it as ea8f7610c.

ob-lilypond.el does not have a maintainer, would you be willing
to volunteer?

Thanks!