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This directory contains plug-in examples in various languages. All source
files here are in the public domain.
In order to be found by the plugin-proxy module, they would be installed under
$(libexecdir)/gwyddion/plugins. However, they are only distributed as
documentation because (a) the plug-in mechanism has been deprecated for more
than a decade (b) registering all the stuff with plugin-proxy would be one of
the slowest things doing during Gwyddion startup, despite also being almost
entirely useless.
All plug-ins implement the same simple Value Invert function for easy
comparison and cross reference. They all appear in
Data Proces -> Plug-Ins -> Test -> Value Invert (LANGUAGE_NAME)
menu in Gwyddion.
All also implement it the same way, if possible: a class/module/unit reading
and writing plug-in proxy dump files is defined separately from the plug-in.
This makes the plug-ins really simple and allows to reuse the module as is.
For languages where it seemed useful, a plug-in helper function/method
encapsulating the command line argument handling is defined too.
C++
Note it doesn't resemble Gwyddion C implementation much, it's full of STL
stuff, a really different implementation.
It is only distributed but never built. It seems a proper configure check
for *optional* C++ is next to impossible.
Files:
dump.cc, dump.hh: Dump format implementation (a really simple class).
plugin-helper.hh: Plug-in helper simplifying command line processing.
invert_cpp.cc: The plug-in itself.
Pascal
Uses Delphi dialect (namely for dynamic arrays), should be compilable
with FreePascal >= 1.9 and Delphi.
Files:
GwyddionDump.pas: Dump format and plug-in helper.
invert_pascal.pas: The plug-in itself.
Perl
Files:
invert_perl.pl: The plug-in itself.
The dump format in implemented in Gwyddion::dump module in
../../perl/Gwyddion/dump.pm, installed with Gwyddion by default.
Python
Files:
invert_python.py: The plug-in itself.
The dump format in implemented in Gwyddion.dump module in
../../python/Gwyddion/dump.py, installed with Gwyddion by default.
Beside that, a one extraodrinary plug-in is present:
yellow.sh
A shell plug-in demostrating a property of plug-in proxy: it remembers
EVERYTHING and only updates it with data obtained from the plug-in.
So this plug-in only writes a single line of metadata and does not
deal with the data itself at all.
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