Which languages (and target names) does genmsg support?

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@janindu thanks very much. When you mention "languages such as C++, Python, and Lisp", what documentation are you referencing? Also, the regular expression you show is specific to message field names, whereas my question concerns cmake target names.

@rubicks, I was referring to the ROS documentation http://wiki.ros.org/ROS/Introduction And yes, the regex was a bit of extra information. The canoe target names as mentioned in the answer are ‘bar_gencpp’, ‘bar_genpy’ and bar_lisp

@janindu , okay, but where is this documented? It would seem genmsg generates cmake target names of the form ${project}_gen${lang}, but I can't find this documented anywhere.

This answer is incomplete: there are code generators for Java and NodeJS as well (and some others, but those are largely unmaintained).

@gvdhoorn , do I understand correctly that such code generators merely exist; i.e., that there is no canonical enumeration thereof?

This loop in genmsg invokes all available generators which are on their own create their targets: https://github.com/ros/genmsg/blob/f9...

@rubicks: generators essentially register as plugins against genmsg using a message_generator tag in the export section of their manifests (here for gencpp fi). I'm not sure there is any convenience script that could look for all such packages on your system.

An indirect way to figure out which generators exist would be to check the Used by section of the Package Links box on the right side of the package header of the wiki/genmsg page. All generators must (well, should, if they want to benefit from it) depend on genmsg, so inspecting that list should give you an idea for which generators exist.

Note that some packages erronously state a dependency on genmsg, but are clearly not generators.

@gvdhoorn , ah, okay. Thanks very much for explaining --- it's not so much that generators are collected and named, it's that each is a package of a certain form and brought in as a dependency. Thanks again.