snap.md
In rswipl: Embed 'SWI'-'Prolog'

Snap

Snap that runs the latest version of swipl and swipl-win.

The snap is strictly contained, so it has limited access to the host system via the following plugs:

| Plug | Description | Autoconnected | | ----------------- | ------------------------- | ------------- | | home | $HOME (no hidden folders) | Yes | | network | network access | Yes | | x11 | I/O and graphics output | Yes | | desktop | common desktop elements | Yes | | desktop-legacy | legacy desktop elements | Yes | | removable-media | removable media | No | | opengl | opengl/gpu hardware | Yes | | audio-playback | audio playback devices | Yes | | audio-record | audio record devices | No |

To connect the removable-media (read/write files on removable storage devices) run the following command:

snap connect swi-prolog:removable-media

To connect the audio-record (allows audio recording via supported services) run the following command:

snap connect swi-prolog:audio-record

If other connections are needed they can be added from this list in future releases.

snap install swi-prolog

If the snap did not add the automated aliases you can add them as follows:

snap alias swi-prolog.swipl swipl
snap alias swi-prolog.swipl-win swipl-win

The config folders are located in a directory specific to the snap:

~/.config -> ~/snap/swi-prolog/current/.config
~/.local -> ~/snap/swi-prolog/current/.local

The rest of the non hidden folders in $HOME are visible as normal

There is an issue with fontconfig, which is used by the GUI tools, and snap. You are a victim of if running ?- emacs. results in the error below:

?- emacs.
[PCE fatal: @helvetica_roman_12/font: Xopen failed on @display/display
    in: <No exception goal>
]
    [13] M @helvetica_roman_12/font ->_xopen(@display/display)
    [12] M @helvetica_roman_12/font ->_xopen(@display/display)
...

This can be resolved by cleaning the fontconfig global cache. Doing so has no consequences except for the first application to use fontconfig starting slow.