Thanks Ibrahima; I indeed had to add 'python' to the list in order to
make the very Python plug-in itself work.  I just (revision 13122) made
the Python detection more systematic for all plug-ins that you mention,
so it would be interesting to check whether they become available
at the next release.

Best wishes, --Joris


On Wed, Nov 11, 2020 at 06:54:16AM +0000, Ibrahima Fall wrote:
>    Hi all,
>    What I've noticed, in my case, is that all plugins which contain the
>    following kind of lines of codes:
>    "
>    (define (python-command)
>      (if (url-exists-in-path? "python3") "python3" "python2"))
>    (define (python-exists?)
>      (or (url-exists-in-path? "python3")
>          (url-exists-in-path? "python2")))
>    "
>      inside their init files, don't work properly with my windows 10
>    environment (busy). 
>    For example: asymptote, dratex, gnuplot, graph, graphviz, plantuml,
>    python, sympy ?, tikz, xypic.
>    Hop this can help,
>    best regards
>    Le mar. 10 nov. 2020 à 11:19, TeXmacs <[1]address@hidden> a
>    écrit :
>
>      Hi Marc,
>
>      The current strategy for finding paths under Windows is as follows:
>
>        - We try to keep track at the default place where plug-ins are
>      installed
>          and to hard-code these locations into TeXmacs (the location may use
>          wildcards for the version number).  _Please_ let us know if we
>      missed
>          any standard search locations so that we can add them when needed.
>
>        - Under Windows, the 'Insert -> Session' menu now contains an extra
>      entry
>          'Manual path', which allows you to specify any special path that
>          the automatic detection mechanism may have missed.
>
>      I will wait for feedback from Darcy about paths that may need to be
>      added
>      for the Python-based plug-ins.  Python itself works on a Windows machine
>      that I recently borroughed for testing purposes.
>
>      Best wishes, --Joris
>
>      On Tue, Nov 10, 2020 at 08:49:02AM +0100, marc lalaude-labayle wrote:
>      >    Thanks.
>      >    And when a package is installed, how does texmacs knows the path ?
>      If it
>      >    is in the help files i didn't find it.
>      >    Marc
>      >
>      >    Envoyé depuis un smartphone
>      >    Le mar. 10 nov. 2020 à 00:20, Massimiliano Gubinelli
>      >    <[1][2]address@hidden> a écrit :
>      >
>      >      You need to have LaTeX installed. Other than that I'm not sure.
>      If still
>      >      does not work it could be due to wrong paths or wrong Python.
>      Darcy,
>      >      what is needed under Windows to have TikZ working?
>      >
>      >      Max
>      >
>      >      > On 9. Nov 2020, at 23:31, marc lalaude-labayle
>      >      <[2][3]address@hidden> wrote:
>      >      >
>      >      > Hi,
>      >      >
>      >      > I'll show the use of tikz among other things with TeXmacs
>      during our
>      >      second session of peer training for texmacs.
>      >      >
>      >      > But all my colleagues use windows that I don't use. My question
>      is :
>      >      is it possible to get the tikz plugin working on windows and if
>      so, how
>      >      ?
>      >      >
>      >      > Thanks again for all your help.
>      >      >
>      >      > Best regards,
>      >      >
>      >      > Marc
>      >
>      > References
>      >
>      >    Visible links
>      >    1. mailto:[4]address@hidden
>      >    2. mailto:[5]address@hidden
>      > /usr/bin/xdg-open: line 402: htmlview: command not found
>      > /usr/bin/xdg-open: line 402: firefox: command not found
>      > /usr/bin/xdg-open: line 402: mozilla: command not found
>      > /usr/bin/xdg-open: line 402: netscape: command not found
>
> References
>
>    Visible links
>    1. mailto:address@hidden
>    2. mailto:address@hidden
>    3. mailto:address@hidden
>    4. mailto:address@hidden
>    5. mailto:address@hidden
> /usr/bin/xdg-open: line 402: htmlview: command not found
> /usr/bin/xdg-open: line 402: firefox: command not found
> /usr/bin/xdg-open: line 402: mozilla: command not found
> /usr/bin/xdg-open: line 402: netscape: command not found