Turtle is a reimplementation of the Unix command line environment in Haskell so
that you can use Haskell as a scripting language or a shell. Think of
coreutils embedded within the Haskell language.
- Install Stack
$ stack ghci turtle Prelude> :set -XOverloadedStrings Prelude> import Turtle
... and try out some basic filesystem operations:
Prelude Turtle> cd "/tmp" Prelude Turtle> mkdir "test" Prelude Turtle> touch "test/foo" Prelude Turtle> testfile "test/foo" True Prelude Turtle> rm "test/foo" Prelude Turtle> testfile "test/foo" False Prelude Turtle> rmdir "test" Prelude Turtle> view (lstree "/usr/lib") FilePath "/usr/lib/gnome-screensaver" FilePath "/usr/lib/gnome-screensaver/gnome-screensaver-dialog" FilePath "/usr/lib/libplist.so.1.1.8" FilePath "/usr/lib/tracker" FilePath "/usr/lib/tracker/tracker-miner-fs" FilePath "/usr/lib/tracker/tracker-extract" FilePath "/usr/lib/tracker/tracker-writeback" FilePath "/usr/lib/tracker/tracker-search-bar" FilePath "/usr/lib/tracker/tracker-store" FilePath "/usr/lib/libgif.so.4.1" ...
To learn more, read the turtle tutorial.
turtle library focuses on being a "better Bash" by providing a typed and
light-weight shell scripting experience embedded within the Haskell language.
If you have a large shell script that is difficult to maintain, consider
translating it to a "
turtle script" (i.e. a Haskell script using the
Among typed languages, Haskell possesses a unique combination of features that greatly assist scripting:
- Haskell has global type inference, so all type annotations are optional
- Haskell is functional and not object-oriented, so boilerplate is minimal
- Haskell can be type-checked and interpreted quickly (< 1 second startup time)
Batteries included: Command an extended suite of predefined utilities
Interoperability: You can still run external shell commands
Portability: Works on Windows, OS X, and Linux
Exception safety: Safely acquire and release resources
Streaming: Transform or fold command output in constant space
Patterns: Use typed regular expressions that can parse structured values
printf-style text formatting
turtle's types and idioms are reasonably complete and I don't expect there
to be significant changes to the library's core API. The only major
functionality that I might add in the future would be to wrap
optparse-applicative in a simpler API.
The set of available tools currently covers as many filesystem utilities as I
could find across Hackage, but I would like to continue to add to the set of
available tools to minimally match
- The haskell-turtle tag on Stack Overflow
How to contribute
Contribute more utilities
License (BSD 3-clause)
Copyright (c) 2017 Gabriel Gonzalez All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of Gabriel Gonzalez nor the names of other contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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