Re: Using recfmt with curly-brace markup

[Jose E. Marchesi]

> I'm trying to use recfmt to generate LaTeX code snippets from records.
> The current implementation results in a fatal error ("invalid
> expression in a template slot") when straightforwardly attempting to
> wrap recfmt's template syntax in another pair of braces.  This has
> somewhat been discussed in a related use case in Guix, which would be
> to get BibTeX records from package descriptions [1].
>
> I attached a patch, which excludes opening braces from the internals of
> a template slot.  This makes it so that only the inner-most template
> pairs are matched and the resulting SEX compiles correctly.

Very nice :)

Applied the patch on your behalf.
Thanks!

> [1] https://lists.gnu.org/archive/html/guix-devel/2021-12/msg00070.html
>
> From 297cfb622c62e90753463692386551449179c008 Mon Sep 17 00:00:00 2001
> From: Liliana Marie Prikler <liliana.prikler@ist.tugraz.at>
> Date: Thu, 20 Jan 2022 11:21:37 +0100
> Subject: [PATCH] recfmt: Allow curly-brace markup in template.
>
> 2022-01-20 Liliana Marie Prikler <liliana.prikler@ist.tugraz.at>
>
>       * utils/recfmt.c (recfmt_apply_template): Add open brace as excluded
>       character in regexp.
>       * torture/utils/recfmt.sh (recfmt-curly): New test.
> ---
>  torture/utils/recfmt.sh | 11 +++++++++++
>  utils/recfmt.c          |  2 +-
>  2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/torture/utils/recfmt.sh b/torture/utils/recfmt.sh
> index 9acdc40..f127408 100755
> --- a/torture/utils/recfmt.sh
> +++ b/torture/utils/recfmt.sh
> @@ -127,6 +127,17 @@ value21 value22value23
>  value31 value32value33
>  '
>  
> +# Apply a template containing curly-brace markup.
> +test_tool recfmt-curly ok \
> +          recfmt \
> +          '"\def\field1{{{field1}}}
> +"' \
> +          multiple-records \
> +'\def\field1{value11}
> +\def\field1{value21}
> +\def\field1{value31}
> +'
> +
>  # Try to apply an empty slot.
>  test_tool recfmt-empty-slot xfail \
>            recfmt \
> diff --git a/utils/recfmt.c b/utils/recfmt.c
> index 7c0b5fa..082e0f5 100644
> --- a/utils/recfmt.c
> +++ b/utils/recfmt.c
> @@ -174,7 +174,7 @@ recfmt_apply_template (rec_record_t record,
>       slot with the empty string.
>    */
>  
> -  if (regcomp (&regexp, "\\{\\{" "[^}]*" "\\}\\}", REG_EXTENDED) != 0)
> +  if (regcomp (&regexp, "\\{\\{" "[^{}]*" "\\}\\}", REG_EXTENDED) != 0)
>      recutl_fatal (_("recfmt_apply_template: error compiling regexp.\
>   Please report this.\n"));