I have a Haskell application which uses optparse-applicative library for CLI arguments parsing. My data type for CLI arguments contains FilePaths (both files and directories), Doubles and etc. optparse-applicative can handle parse errors but I want…
I have the following Haskell code using optparse-applicative which hangs at runtime.
main :: IO ()
main = do
printf "Start...\n"
args <- execParser $ info args fullDesc
printf "Cmdline args: %s\n" (show args)
args :: Parser [Integer]
args =…
Using optparse-applicative, I'd like to have an optional argument, which should be a path to a file, or when not specified, stdin. The obvious choice here is to make this argument type IO Handle and when an argument is passed in use openFile. Here's…
optparse-applicative package provides very powerful tools for command-line arguments parsing. Among them is the automatic usage text generation, which is printed in case of parsing error or by --help option if the parser is used by execParser…
I'm trying to use my own monad (instead of IO) with customExecParser https://hackage.haskell.org/package/optparse-applicative-0.15.1.0/docs/Options-Applicative-Extra.html#v:customExecParser.
So I've ended up with (significant function being…
I'm trying to build a CLI food journal app.
And this is the data type I want the user input to be parsed in.
data JournalCommand =
JournalSearch Query DataTypes Ingridents BrandOwnder PageNumber
| JournalReport Query DataTypes Ingridents…
I'm using optparse-applicative that comes with stackage lts 5.1
I have a parser with subcommands and I have described a help text for their options, but they don't show.
This is the output when I run the executable with --help :
[david@devcentos65…
i will determine the program mode from the arguments count (without flags / 'subparser' & 'command') but without success.
ghci session
main% stack ghci optparse-applicative
Configuring GHCi with the following packages:
GHCi, version 7.10.2:…
I have a basic command add that takes 2 kind of arguments: a word or a tag. A tag is just a word starting by +. A word is just a String. It can contain at least one argument (I use some for this).
data Arg = Add AddOpts
data AddOpts = AddOpts
{…
I am having two issues with optparse-applicative: (I put the issues together, since it is likely there is one underlying mis-conception).
It is saying that the usage is : (COMMAND | COMMAND)
crime cli - process CRIME template and deploy…
I want to parse command line options corresponding to a product type resembling below.
data SumType1 = d | e | f
data SumType2 = g | h | i
data Config = Config {
a :: Bool,
b :: SumType1,
c :: SumType2
}
pB :: Parser SumType1
pB =…
Given a Parser a and a value of type a is it possible to generate the relevant command-line (in textual format)? (Basically, the exact reverse of what optparse-applicative is generally used for!)
For example, given something like...
data Args =…
I was watching a video made by Richard Cook on SafariBookOnline. He builds a command line app with Haskell. In this video, he explains some basic concepts while writing a program to parse command lines arguments.
I am quite new to Haskell, and I…
I have complicated command line options, as
data Arguments = Arguments Bool (Maybe SubArguments)
data SubArguments = SubArguments String String
I want to parse these subarguments with a flag:
programName --someflag --subarguments "a"…
