Hey Pants Team, curious how we be able to extend existing targets to include new file extensions? For example, let's say we want shell sources to autogenerate for

.sh

and

.sh.tpl

. I see this doc https://www.pantsbuild.org/2.18/docs/writing-plugins/the-target-api/extending-existing-targets is the correct way to just extend the shell source value for for

expected_file_extensions

?

Some options that come to mind are setting

sources

on

shell_sources

targets by either: • using a macro wrapping it

shell_sources()

, like

def my_shell_sources(sources=["*.sh", "*.sh.tpl"], **kwargs): return shell_sources(sources=sources,**kwargs)

• setting

sources

with

__defaults__

, e..g

__defaults__({shell_sources: dict(sources=["*.sh", "*.sh.tpl"])})

I'm not sure either of those perfect. For instance,

pants tailor ::

won't create a

shell_sources

target within a directory that contains only

.sh.tpl

files.

Yea, as Huon points out, you'd just want to work with the sources value, as the shell backend doesn't use the expected file extensions feature as shell sources technically doesn't require them.

thank you for the suggestions! Fortunately this is only in one directory. I'm leaning towards creating one

shell_sources

target and globing all files from sub directories. It will be come painful since tailor can't be tuned for this