hk

Bash script for running some quick haskell on the command line

USAGE: hk [OPTIONS] [CODE]

hk facilitates running some quick haskell at your shell prompt

The type of CODE can be an IO type or anything for which there is a Show instance. If unsure, try something and then just run hk -e to see the actual program in vim or the editor indicated by the EDITOR environment variable. Remember to observe the quoting rules of your shell; for example, in bash, you probably want to enclose CODE in single quotes.

OPTIONS:

-e Edit the last script and then run it in current directory

-d Dump last script to stdout

-p CODE Pipe mode, apply CODE to contents of stdin

-x CODE Show result of CODE using xmessage

-h This help screen

EXAMPLES:

Assuming Bash quoting rules:

Use hk as a calculator

$ hk sum [1..10]/5
11.0

Sum numbers in file 'Nums'

$ hk 'readFile "Nums" >>= print . sum . map read . lines'
1123

Alternative to above using pipe

$ cat Nums | hk -p 'sum . map read . lines' 
1123

If getArgs occurs in first parameter, then interpret the rest as command line arguments

$ hk 'getArgs>>= print . sum . map read' 1000 100 20 3
1123

Note: -p is only for convenience, it may be preferable to call getContents explicitly

$ echo -e "ok\nthen\nsome" | hk 'liftM2 zip getArgs (fmap lines getContents)' arg1 arg2 arg3
[("arg1","ok"),("arg2","then"),("arg3","some")]