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Showing content from https://github.com/lunarmodules/Penlight below:

lunarmodules/Penlight: A set of pure Lua libraries focusing on input data handling (such as reading configuration files), functional programming (such as map, reduce, placeholder expressions,etc), and OS path management. Much of the functionality is inspired by the Python standard libraries.

Penlight brings together a set of generally useful pure Lua modules, focusing on input data handling (such as reading configuration files), functional programming (such as map, reduce, placeholder expressions, etc), and OS path management. Much of the functionality is inspired by the Python standard libraries.

• path: queries like isdir,isfile,exists, splitting paths like dirname and basename
• dir: listing files in directories (getfiles,getallfiles) and creating/removing directory paths
• file: copy,move; read/write contents with read and write

• app: require_here to rebase require to work with main script path; simple argument parsing parse_args
• lapp: sophisticated usage-text-driven argument parsing for applications
• config: flexibly read Unix config files and Windows INI files
• strict: check for undefined global variables - can use strict.module for modules
• utils,compat: Penlight support for unified Lua 5.1/5.2 codebases
• types: predicates like is_callable and is_integer; extended type function.

• utils: can split a string with a delimiter using utils.split
• stringx: extended string functions covering the Python string type
• stringio: open strings for reading, and creating strings using standard Lua IO methods
• lexer: lexical scanner for splitting text into tokens; special cases for Lua and C
• text: indenting and dedenting text, wrapping paragraphs; optionally make % work as in Python
• template: small but powerful template expansion engine
• sip: Simple Input Patterns - higher-level string patterns for parsing text

• tablex: copying, comparing and mapping over
• pretty: pretty-printing Lua tables, and various safe ways to load Lua as data
• List: implementation of Python 'list' type - slices, concatenation and partitioning
• Map, Set, OrderedMap: classes for specialized kinds of tables
• data: reading tabular data into 2D arrays and efficient queries
• array2d: operations on 2D arrays
• permute: generate permutations

• seq: working with iterator pipelines; collecting iterators as tables
• class: a simple reusable class framework
• func: symbolic manipulation of expressions and lambda expressions
• utils: utils.string_lambda converts short strings like '|x| x^2' into functions
• comprehension: list comprehensions: C'x for x=1,4'()=={1,2,3,4}

Penlight is strictly versioned according to Semantic Versioning.

In scope of the version:

• functionality provided by Penlight modules/classes
• based on stock Lua PuC-Rio or LuaJIT

Not in scope of the version:

• Documentation
• Error messages (textual changes)
• Deprecation warnings (by default to stderr)

Any version may deprecate functionality. So new deprecation notices may appear in major, minor, and patch releases. Final removal of functionality (assuming it is a breaking change) will only be done in a major version.

It is strongly suggested to use the deprecation warning mechanism to test usage of deprecated functionalities when upgrading. This is done by enabling the warning system (in Lua 5.4, or the Penlight compatibility function for earlier versions):

require "pl.compat"
warn "@on"

See pl.utils.raise_deprecation for more info.

Penlight is distributed under the MIT license.

Using LuaRocks: simply run luarocks install penlight.

Manually: copy lua/pl directory into your Lua module path. It's typically /usr/local/share/lua/5.x on a Linux system and C:\Program Files\Lua\5.x\lua for Lua for Windows.

The file and directory functions depend on LuaFileSystem, which is installed automatically if you are using LuaRocks. Additionally, if you want dir.copyfile to work elegantly on Windows, then you need Alien. Both libraries are present in Lua for Windows.

Requires ldoc, which is available through LuaRocks. Then it's a simple matter of running ldoc . from the repo.

Contributions are most welcome, please check the contribution guidelines.

Execute lua run.lua tests to run the tests. Execute lua run.lua examples to run examples.

For a complete history of the development of Penlight, please check the changelog.

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