Popularity
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Growing
Activity
2.4
Growing
42
12
3
Monthly Downloads: 659
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Latest version: v0.13
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README
getopt-generics
Status
This library is experimental.
Usage
getopt-generics tries to make it very simple to create command line
interfaces. Here's an example:
<!--- ### Start "docs/Simple.hs" "module Simple where\n\n" (MarkDown Haskell) ### -->
import WithCli
main :: IO ()
main = withCli run
run :: String -> Int -> Bool -> IO ()
run s i b = print (s, i, b)
<!--- ### End ### -->
This is how the program behaves in a shell:
<!--- ### Start "docs/Simple.shell-protocol" "" (MarkDown Shell) ### -->
$ program foo 42 true
("foo",42,True)
$ program --help
program [OPTIONS] STRING INTEGER BOOL
-h --help show help and exit
$ program foo 42 bar
cannot parse as BOOL: bar
# exit-code 1
$ program
missing argument of type STRING
missing argument of type INTEGER
missing argument of type BOOL
# exit-code 1
$ program foo 42 yes bar
unknown argument: bar
# exit-code 1
<!--- ### End ### -->