BSD-3-Clause licensed and maintained by Neil Mitchell
This version can be pinned in stack with:cmdargs-0.10.12@sha256:933ea0b92e9faa00c60563a3b3307b4af37be6a63f9ea28ec5cce13992ff5d53,4099

Module documentation for 0.10.12

  • System
    • System.Console
      • System.Console.CmdArgs
        • System.Console.CmdArgs.Annotate
        • System.Console.CmdArgs.Default
        • System.Console.CmdArgs.Explicit
        • System.Console.CmdArgs.GetOpt
        • System.Console.CmdArgs.Helper
        • System.Console.CmdArgs.Implicit
        • System.Console.CmdArgs.Text
        • System.Console.CmdArgs.Verbosity

CmdArgs: Easy Command Line Processing Hackage version Build Status

sample = Sample{hello = def &= help “World argument” &= opt “world”} &= summary “Sample v1”

main = print =<< cmdArgs sample

$ runhaskell Sample.hs –help Sample v1, (C) Neil Mitchell 2009

sample [FLAG]

-? –help[=FORMAT] Show usage information (optional format) -V –version Show version information -v –verbose Higher verbosity -q –quiet Lower verbosity -h –hello=VALUE World argument (default=world)

{-# LANGUAGE DeriveDataTypeable #-}
module Sample where
import System.Console.CmdArgs

data Sample = Sample {hello :: String}
              deriving (Show, Data, Typeable)

sample = Sample{hello = def}

main = print =<< cmdArgs sample

$ runhaskell Sample.hs –version The sample program

$ runhaskell Sample.hs –help The sample program

sample [OPTIONS]

-? –help Display help message -V –version Print version information -h –hello=ITEM

data Sample = Hello {whom :: String}
            | Goodbye
              deriving (Show, Data, Typeable)

hello = Hello{whom = def}
goodbye = Goodbye

main = print =<< cmdArgs (modes [hello,goodbye])

$ runhaskell Sample.hs goodbye Goodbye

$ runhaskell Sample.hs –help The sample program

sample [OPTIONS]

Common flags -? –help Display help message -V –version Print version information

sample hello [OPTIONS]

-w –whom=ITEM

sample goodbye [OPTIONS]

HLint v0.0.0, (C) Neil Mitchell

Suggest improvements to Haskell source code

Common flags:
  -r --report[=FILE]	        Generate a report in HTML
  -h --hint=FILE	            Hint/ignore file to use
  -c --colour --color	        Color the output (requires ANSI terminal)
  -i --ignore=MESSAGE	        Ignore a particular hint
  -s --show                     Show all ignored ideas
     --extension=EXT            File extensions to search (defaults to hs and lhs)
  -X --language=LANG	        Language extension (Arrows, NoCPP)
  -u --utf8	                    Use UTF-8 text encoding
     --encoding=ENC	            Choose the text encoding
  -f --find=FILE	            Find hints in a Haskell file
  -t --test	                    Run in test mode
  -d --datadir=DIR	            Override the data directory
     --cpp-define=NAME[=VALUE]  CPP #define
     --cpp-include=DIR	        CPP include path
  -? --help	                    Display help message
  -V --version	                Print version information
  -v --verbose	                Loud verbosity
  -q --quiet	                Quiet verbosity

Hlint gives hints on how to improve Haskell code

To check all Haskell files in 'src' and generate a report type:
  hlint src --report
Diffy v1.0
diffy [COMMAND] ... [OPTIONS]
  Create and compare differences
Common flags:
  -o --out=FILE	 Output file
  -? --help	     Display help message
  -V --version	 Print version information
diffy create [OPTIONS]
  Create a fingerprint
  -s  --src=DIR  Source directory
  Perform a diff
Maker v1.0
  Make it
maker [COMMAND] ... [OPTIONS]
  Build helper program
Common flags:
  -? --help     Display help message
  -V --version  Print version information
maker [build] [OPTIONS] [ITEM]
  Build the project
  -j --threads=NUM  Number of threads to use
  -r --release      Release build
  -d --debug        Debug build
  -p --profile      Profile build
maker wipe [OPTIONS]
  Clean all build objects
maker test [OPTIONS] [ANY]
  Run the test suite
  -j --threads=NUM  Number of threads to use


Changelog for CmdArgs

GHC 7.2 compatibility
#15, never put [brackets] around optional args in Explicit
#14, fix @ file arguments
#10, fix versionArgs (broken in 0.10.8)
Avoid compilation warnings on GHC 7.8
#9, add --numeric-version flag
Update the copyright year
Change GetOpt.usageInfo to be more like GetOpt
#1, fix timestamps in .tar.gz dist file
#625, more documentation about args/argPos
#626, ensure initial lists don't get reversed (fix after #610)
#615, support lists inside a newtype
#610, make sure it is O(n) to append arguments, not O(n^2)
Append list items under an enum
Support &= ignore on enum fields
Relax upper bounds to be GHC 7.7 compatible
#569, set the test program to off by default
Complete revamp of cmdargs-browser, far better Javascript
Add a missing case for Helper marshalling FlagNone
Revert to 0.9.6, including modeExpandAt
Revert to 0.9.5, to fix up PVP breakage
#539, hopefully more fixes to compiling in profile mode
#522, add modeExpandAt and noAtExpand annotation
#522, don't @expand after --
Don't specify TH extension unless quotation is true
#539, specify the TH extension in the Cabal file
Allow transformers 0.3.*
Correct copyright in license and cabal file
Add expandArgsAt and support for @ flag file directives
Don't build the test program if quotation is turned off
Improve the documentation for the Explicit module
#433, propagate groupname on modes in the Implicit code
#467, add completions for people running bash
#334, add a Quote module, to write pure in the impure syntax
#482, fix the sample in Explicit, don't use def
#461, fix the translation for enum/enum_
Make showHelp take an argument for the prefix bits
Add Helper interface, and initial cmdargs-browser code
Add splitArgs/joinArgs
#450, redo the manual generator so Maker example is not cut off
Support all the types in Data.Int/Data.Word
Make modeArgs take a list of arguments as well
No changes, just a version bump to allow requiring the GHC fix
Change the annotate module to cope better with GHC's CSE
#422, support newtype value as the underlying type
Allow versionArgs [summary] to override --version
Improve the documentation surrounding opt
Add modeReform to Mode
Add modeEmpty, to construct blank Mode values
Improve the documentation surrounding pure annotations.
#395, don't put two newlines after --help or --version
#392, support helpArgs [groupname "something"]
Don't fail with ambiguous enum if you exactly match a value
Put errors on stderr
Eliminate the filepath dependence
Switch mtl for transformers
Build on GHC 7.0 RC2, add an extra type signature
Add verbosityArgs to customise the verbose/quiet flags
Add helpArg/versionArg flags to customise those flags
Support multiline summary using \n escape codes
Build on GHC 6.10, don't rely on record name disambiguation
Add ignore annotation for modes and flags
#350, make top-level help appear properly
#351, name/explicit attributes on mode were broken (regression)
#342, display common fields only once
Raise errors if annotations are placed in invalid places
Rewrite the translation of annotation to explicit modes
Treat anything after -- as an argument
Add a pure annotation mechanism
Introduce System.Console.CmdArgs.Annotate
Add a documentation example for the Explicit mode
Improve the purity and annotations a bit, try disabling CSE
Change the help format
Rename groupHiden to groupHidden, patch from Matthew Cox
Bug, missing fields and explicit enums didn't work together
#252, add support for grouped flags/modes
#333, support missing fields
Add support for reading tuple values (including nested)
#292, add support for automatic enumerations
#221, make argpos work with non-string fields
#222, support opt and args together
#230, different modes can share short flags
#295, make verbosity flags explicit
#231, add support for Maybe
#256, add --option=false support
Complete rewrite to introduce Explicit module
Start of changelog