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env-parser is a small library for configuring programs based on information
from the environment. It's goals and design are similar to that of cmdargs
or optparse-applicative@ but aimed at automatically managed programs such as
those that might be run via Heroku or Runit/daemontools.
env-parser intentionally sacrifices power for comprehensibility---the
primary interface, Parser, implements only Applicative. This provides
better runtime error messages and automatically generated static help using
parser annotations. It also expresses a principle of simplicity in
configuration: arbitrary uses of Monad or even Alternative can lead to
opaque failures prior to a program even beginning to run.
