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| author | Vincent Ambo <mail@tazj.in> | 2020-06-16T00·05+0100 |
|---|---|---|
| committer | Vincent Ambo <mail@tazj.in> | 2020-06-16T00·05+0100 |
| commit | 2edb963b97867b27f68efac8d05bf966077b0b01 (patch) | |
| tree | c3bb279dfd4330e09a0af6ef4e84ff8a9a3bc7ad /users/glittershark/xanthous/src/Xanthous/Util/Optparse.hs | |
| parent | 91f53f02d8479303910abfd3f3690d3ef27e6c4b (diff) | |
| parent | 53b56744f4335c038724a1bcffc27a7eb8cf6a6d (diff) | |
Add 'users/glittershark/xanthous/' from commit '53b56744f4335c038724a1bcffc27a7eb8cf6a6d' r/978
git-subtree-dir: users/glittershark/xanthous git-subtree-mainline: 91f53f02d8479303910abfd3f3690d3ef27e6c4b git-subtree-split: 53b56744f4335c038724a1bcffc27a7eb8cf6a6d
Diffstat (limited to 'users/glittershark/xanthous/src/Xanthous/Util/Optparse.hs')
| -rw-r--r-- | users/glittershark/xanthous/src/Xanthous/Util/Optparse.hs | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/users/glittershark/xanthous/src/Xanthous/Util/Optparse.hs b/users/glittershark/xanthous/src/Xanthous/Util/Optparse.hs new file mode 100644 index 0000000000..dfa6537235 --- /dev/null +++ b/users/glittershark/xanthous/src/Xanthous/Util/Optparse.hs @@ -0,0 +1,21 @@ +-------------------------------------------------------------------------------- +module Xanthous.Util.Optparse + ( readWithGuard + ) where +-------------------------------------------------------------------------------- +import Xanthous.Prelude +-------------------------------------------------------------------------------- +import qualified Options.Applicative as Opt +-------------------------------------------------------------------------------- + +readWithGuard + :: Read b + => (b -> Bool) + -> (b -> String) + -> Opt.ReadM b +readWithGuard predicate errmsg = do + res <- Opt.auto + unless (predicate res) + $ Opt.readerError + $ errmsg res + pure res |