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"""Runs ghc --help"""
hs_toolchain = "@io_tweag_rules_haskell//haskell:toolchain"
def _impl(ctx):
output = ctx.outputs.out
ghc = ctx.toolchains[hs_toolchain].tools.ghc
ctx.actions.run_shell(
inputs = [ghc],
outputs = [output],
progress_message = "Printing ghc help message",
command = "%s --help > %s" % (ghc.path, output.path),
)
ghc_help = rule(
implementation = _impl,
outputs = {"out": "out_file"},
toolchains = [hs_toolchain],
)
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