osm requires json-parse-string

osm requires json-parse-string

[Eric S Fraga]

The osm package requires json-parse-string which is not built-in to
Emacs, as far as I can see.  Should the package indicate requirements
and/or auto-install them if using package-install?
-- 
Eric S Fraga with org 9.5.2 in Emacs 29.0.50 on Debian 11.2

Re: osm requires json-parse-string

[Eric S Fraga]

Ignore noise: it seems I need to actually build Emacs with json support.
-- 
Eric S Fraga with org 9.5.2 in Emacs 29.0.50 on Debian 11.2

Re: osm requires json-parse-string

[Robert Pluim]

>>>>> On Thu, 17 Mar 2022 10:05:17 +0000, Eric S Fraga <e.fraga@ucl.ac.uk> said:

    Eric> Ignore noise: it seems I need to actually build Emacs with json support.

But osm should be fixed to fall back to using json-read-from-string in
that case.

Robert
-- 

Re: osm requires json-parse-string

[Thibaut Verron]

On 17/03/2022 11:00, Eric S Fraga wrote:
> The osm package requires json-parse-string which is not built-in to
> Emacs, as far as I can see.  Should the package indicate requirements
> and/or auto-install them if using package-install?

As far as I know, it is included in emacs, unless emacs was compiled 
with --without-json or --without-all.

If the function is missing, as it is a C function, I don't know if there 
is a drop-in elisp replacement one could install as a fallback.

Best wishes,

Thibaut

Re: osm requires json-parse-string

[Eric S Fraga]

On Thursday, 17 Mar 2022 at 11:08, Thibaut Verron wrote:
> As far as I know, it is included in emacs, unless emacs was compiled
> with --without-json or --without-all.

Ah, true but only if the requisite library is available as well!  I had
to delve into the configure script to figure out I needed to install the
jansson dev package.

All good now.

Thank you,
eric

PS - osm is fantastic!  yet another thing I can do in Emacs.
-- 
Eric S Fraga with org 9.5.2 in Emacs 29.0.50 on Debian 11.2

Re: osm requires json-parse-string

[Joost]

On Thu, 17 Mar 2022, at 11:08, Thibaut Verron wrote:
> On 17/03/2022 11:00, Eric S Fraga wrote:
>> The osm package requires json-parse-string which is not built-in to
>> Emacs, as far as I can see.  Should the package indicate requirements
>> and/or auto-install them if using package-install?
>
> As far as I know, it is included in emacs, unless emacs was compiled 
> with --without-json or --without-all.
>
> If the function is missing, as it is a C function, I don't know if there 
> is a drop-in elisp replacement one could install as a fallback.

There is an Elisp library `json.el` that comes with Emacs, which is also available in Emacs 26 (and perhaps earlier versions, dunno). But it's not a drop-in replacement, because the functionality of the two isn't entirely equivalent (and function names are different). So if `osm` isn't set up to work with it as an alternative, native json support is gonna be necessary.

-- 
Joost Kremers
Life has its moments