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LuaX interactive usage

The LuaX REPL can be run in various environments:

  • the full featured LuaX interpreter based on the LuaX runtime
  • the reduced version running on a plain Lua interpreter

Full featured LuaX interpreter

Self-contained interpreter

$ luax

Shared library usable with a standard Lua interpreter

$ lua -l luax

Reduced version for plain Lua interpreters

LuaX with a plain Lua interpreter

luax.lua

LuaX with the Pandoc Lua interpreter

luax-pandoc.lua

The integration with Pandoc is interesting to debug Pandoc Lua filters and inspect Pandoc AST. E.g.:

$ rlwrap luax-pandoc.lua

 _               __  __  |  https://cdelord.fr/luax
| |   _   _  __ _\ \/ /  |
| |  | | | |/ _` |\  /   |  Version X.Y
| |__| |_| | (_| |/  \   |  Powered by Lua X.Y
|_____\__,_|\__,_/_/\_\  |  and Pandoc X.Y
                         |  <OS> <ARCH>

>> pandoc.read "*Pandoc* is **great**!"
Pandoc (Meta {unMeta = fromList []}) [Para [Emph [Str "Pandoc"],Space,Str "is",Space,Strong [Str "great"],Str "!"]]

Note that rlwrap can be used to give nice edition facilities to the Pandoc Lua interpreter.

Additional modules

The luax repl provides a few functions for the interactive mode.

In interactive mode, these functions are available as global functions and modules.

LuaX preloads the following modules with the -e option or before entering the REPL:

  • F
  • complex
  • crypt
  • fs
  • imath
  • lz4
  • lzip
  • mathx
  • ps
  • qmath
  • sh
  • sys
show(x)

returns a string representing x with nice formatting for tables and numbers.

precision(len, frac)

changes the format of floats. len is the total number of characters and frac the number of decimals after the floating point (frac can be nil). len can also be a string (custom format string) or nil (to reset the float format). b can be 10 (decimal numbers), 16 (hexadecimal numbers), 8 (octal numbers), a custom format string or nil (to reset the integer format).

base(b)

changes the format of integers. b can be 10 (decimal numbers), 16 (hexadecimal numbers), 8 (octal numbers), a custom format string or nil (to reset the integer format).

indent(i)

indents tables (i spaces). If i is nil, tables are not indented.

prints(x)

prints show(x)