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coreutils

Unix core utilities implemented in Haskell.

Goals are:

  • idiomatic implementations
  • fast, lazy IO
  • feature parity with GNU utils
  • fully tested
  • platform independent
Utility Idiomatic Complete Fast Lazy Tests
cat
cut 90 75 90
echo - - -
env - -
head
nologin - - -
pwd - - -
rev
seq
split
sleep - -
tac 90
tee
test
tr 70 40 40 30
uniq 80 90
wc
which - - -
yes -
Symbol Meaning
Fully complete
- Not applicable
n% % feature complete

Usage

This project compiles to a single executable which detects which utility to call depending on the name of the binary.

make release

or

stack install --flag coreutils:release

Platform Independent

With utils on your path, you can call any utility by name, using the name as the first argument.

I leaf@elm ~> utils echo hello | utils rev
olleh
C:\Users\leaf>utils echo hello | utils rev
olleh

This is the best option for trying things out without committing your entire shell to these implementations. The testing done is mostly thorough, but there's some crazy usage of the coreutils out in the wild; like cat - - - in build scripts. Who needs to read stdin three separate times? The standard Haskell IO libraries make some sane assumptions that things like this don't happen, so this project has balance ugly workarounds with idomatic behavior. Where reasonable, idomatic is preferred. Further, this project relies on the Haskell IO libraries for platform independence - where they decided to simplify (permissions, file types), this project does also.

Linux, FreeBSD, MacOS

If you do want to commit, symlink the utilities you'd like to expose to your $PATH variable. If ~/.local/bin/ has precedence over /bin/ and /usr/bin/, these are the versions your shell will use.

cd ~/.local/bin/
ln -s utils cat
ln -s utils sleep
ln -s utils rev
...
I leaf@elm ~> which which
/home/leaf/.local/bin/which

On Windows

Symlinking doesn't appear to change the name reported by System.Environment.getProgName, so you'll need to create copies of the binary with different names.

PS C:\> cd (Split-Path -Parent (Get-Command utils.exe).Path)
PS C:\Users\leaf\AppData\Roaming\local\bin> cp utils.exe which.exe
PS C:\Users\leaf\AppData\Roaming\local\bin> cd C:\
PS C:\> which calc.exe
C:\WINDOWS\system32\calc.exe
PS C:\> which which.exe
C:\Users\leaf\AppData\Roaming\local\bin\which.exe

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Unix core utilities implemented in Haskell

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