cLua

A Conditional Lua compiler!

Currently on version: 2.0.0

Now available through MPT! (currently on version 2.0.0-p42; support discontinued)

cLua
Changelog

What does it do?

cLua allows you to create modular CC Programs and release them as a single file, without needing to copy-paste them into a release file.

Why'd you make it?

I felt inspired after seeing @SquidDev's Pre-Processor Includes, so I decided to make a conditional compiler.

How do I use it?

It works just like the preprocessor in C++. It scans for preprocessor directives (PPDs), and performs commands based on them.

The current PPDs are:

#INCLUDE file FROM dir -- Copies the contents of the specified file to that point in the file. Use `~' as a shortcut to the library folder. Use '?here' as a shortcut to the current directory. Use `?there' as a shortcut to the output directory.
#DEFINE flag -- Sets flag at a given point. cLua keeps track of these flags to prevent infinite loops, so I recommend using something like #DEFINE <filename> at the start of each file.
#IFDEF flag ... #ENDIFDEF -- Only copies the code between #IFDEF and ENDIFDEF if flag has been set.
#IFNDEF flag ... #ENDIFNDEF -- Only copies the code between #IFNDEF and #ENDIFNDEF if flag has not been set.
#IFVAR variable ... #ENDIFVAR -- Only copies the code between #IFVAR and #ENDIFVAR if variable is defined.
#IFNVAR variable ... #ENDIFNVAR -- Only copies the code between #IFNVAR and #ENDIFNVAR if variable is not defined.
#SNIPPET -- Ignores all directives until the end of the file. Use at the start of a file if you want to be able to #INCLUDE it several times.
#EXEC code -- Executes arbitrary Lua code. Should not be used to set variables.
#LICENSE license [vars] -- Adds the specified license to the .licensing file for the current file.
#SETDYNAMICVAR variable:value ... -- adds a value the the list VAR.
#DYNAMIC-INCLUDE delim1 delim2 [text] ... -- Inserts a line into the current file, replacing text between delim1 and delim2 with its value in VAR.

To compile a program, use the following syntax:

clua <input> <output> [--help] [-?] [--log] [--version] [--dry-run] [--exec:<code> ...] [--dyn:<var>=<val>[;<var>=<val>...] ...] [--define:<flag>[;<flag>...] ...] [--quiet] [--silent] [--verbose] [--devel] [--no-debug] [--no-trim] [--self-update] [--to-path:<path>] [--from-path:<path>]
--help, -? - Display this help message and exit.
--log - Enables logging.
--version - Print version info and exit.
--dry-run - Runs through the compilation, but doesn't modify the output file.
--exec:<code> - Executes arbitrary code before compilation. Use ++ instead of spaces, or include the entire option in double quotes (").
--dyn:<var>=<val>[;<var>=<val>...] - Equivelent to #DYNAMIC-INCLUDE
--define:<flag>[;<flag>...] - Equivelent to #DEFINE.
--quiet - Do not print most messages.
--silent - Only print errors.
--verbose - Prints ALL messages.
--devel - Allows logging of DEVEL level messages. Useful only for debugging. Much slower than normal, especially for large programs. Not recommended.
--no-debug - Don't log DEBUG level messages.
--self-update - Downloads and runs the latest cLua installer, then reboots.
--no-trim - Prevents the trimming of empty lines when writing the output.
--to-path:/path/ - Specifies where to output the compiled program and license.
--from-path:/path/ - Specifies where to look for the main source file.

Don't worry about including cLua's path when you call it; the installer takes care of that for you.

When should I use it?

cLua really shines in large projects where managing code becomes a hassle, because multiple independent phases of a program get forced into a single massive file. It's also really useful when you use the same code in multiple projects; just write that code in a separate file, and #INCLUDE it.

When shouldn't I use it?

cLua is NOT a replacement for os.loadAPI(). Use PPI for that. (Don't worry, we're compatible!) cLua does not support more than one level of recursion. Loop detection would need way too much work to fix this, so it'll probably never change.

How do I install it?

Using pastebin

Simply type:

pastebin run zPMasvZ2

to install it.

If that doesn't work, type:

pastebin get zPMasvZ2 cLua-inst
cLua-inst

The installer will ask you where you'd like it installed; I recommend using /clua, but it's really a matter of preference.

To update, just run:

clua --self-update

Using MPT

Simply run

mpt ppa add skwerlman
mpt install clua

How do I uninstall it?

Step one: let me know why (assuming its an issue with the program itself). I'm always looking for feedback about the quality of programs, and knowing what people like or dislike is essential to creating a good program. Step two: Depends on how it was installed.

If you installed using MPT

Simply run:

mpt remove clua
mpt install clua-uninstall
mpt remove clua-uninstall

If you installed using Pastebin

First, delete the folder where cLua was installed. Next, run edit /startup Look through startup for the line -- BEGIN CLUA GLOBALS. It should be near the top. Delete all of the lines from that one until the line -- END CLUA GLOBALS.

What's next?

I'm going to start working on a collection of libraries which will be included with cLua, and will be easily available.

My current To-Do list (in no particular order):

Add #ELSE directive
Add #ELSEIF directive
Add #ELSEIFN directive
Fix everything in the 'Known Bugs' section
Update to the current CC
Add --minify
- Figure out how to get LuaMinify running under CC
- Add tests for minify
Merge logging options
Port OneOS to cLua
Add short versions of most options
Update documentation
Add optional examples folder
Add more libraries
Port cLua to cLua
- Split cLua.lua into seperate parts
Improve code comments
Clean up code style

My top three priorities ATM (most to least important):

Add --minify option
Merge logging options into single --log-level= option
Add #ELSE, #ELSEIF, and #ELSEIFN

What if there's an issue?

If you encounter a bug, typo, or other problem with the code, create a new issue here. If you'd like to make a suggestion, create an issue with [suggestion] in the title.

I coded this in CC 1.63, but with the intention of it being backwards compatible with CC 1.5. If it isn't, let me know here!

Can you add...?

Let me know in the comments. If it's a good idea (and I can figure out how to implement it) I'll add it. One thing will never happen, though: a GUI.

Known bugs

None, at the moment. Help me find some!

I'd like to submit a library...

If you'd like to submit a library for inclusion in the cLua library, send me a PM with a link to the code. If it's good enough, I'll include it.

Important notes!

The cLua installer will inject code into the existing startup file. If there is no startup file, it will create one. The code inserted includes several global variable definitions, and one shell.setAlias() command. This code is inserted at the top of the startup file, and should have no effect on the function of rest of the startup file. As of version 1.3.0, the injected code will look something like this:

-- BEGIN CLUA GLOBALS
-- FILE MODIFIED BY CLUA-INSTALL
-- cLua Copyright 2014 Skwerlman
CLUA_VERSION = '1.3.0'
CLUA_HOME = '/clua/'
CLUA = CLUA_HOME..'clua.lua'
CLUA_LIB = CLUA_HOME..'lib'
CLUA_LIB_LIST = {}
CLUA_LOG = CLUA_HOME..'clua.log'
CLUA_LUAMAN = false
shell.setAlias('clua', CLUA)
-- END CLUA GLOBALS

When rerunning the installer (such as when upgrading to a new version), all code between -- BEGIN CLUA GLOBALS and -- END CLUA GLOBALS will be removed from the file, and replaced with the newer info.

If you'd like to override any of these values, I recommend doing so after -- END CLUA GLOBALS so that the changes aren't overwritten.

cLua is semantically versioned.

cLua is released under GPLv2. A copy of the license is available here.

Changelog

2.0.0
- BUGFIX: Nested block-type directives now behave as expected
- BUGFIX: Line numbers are no longer distorted by block-type directives
- BUGFIX: EXEC no longer crashes when reporting certain crashes
- BUGFIX: Handles failure to open log more gracefully (more improvements to come)
- CHANGE: --silent now prevents ALL output except errors
- CHANGE: GPLv2 now lists author in MODULE line
- CHANGE: --define now supports multiple flags per option, separated by semicolons
- CHANGE: because of a change in the versioning system, we've moved to version 2.0.0
- CHANGE: LICENSE no longer errors when a file is given more than one license; it throws a warning instead
- CHANGE: DEVEL logging is slightly less verbose
- NEW: self testing suite added (not automatically downloaded; available on the github)
- NEW: --no-trim option
- NEW: --dyn option
- NEW: --from-path option
- NEW: --to-path option
- NEW: Add full support for nested directives
1.5.0
- BUGFIX: EXEC, IFVAR, IFNVAR, and --exec now have read-only access to certain internal functions and vars
- BUGFIX: EXEC, IFVAR, IFNVAR, and --exec now have read-only access to _G
- BUGFIX: Various typos fixed
- BUGFIX: cLua now reports faulty environments rather than simply crashing
- CHANGE: all code now wrapped in pcall to allow for prettier errors
- CHANGE: libraries now call EXEC log() instead of EXEC print()
- CHANGE: added correct licensing info to LUABIT
- CHANGE: all libraries are now formatted the same way
- CHANGE: logging output is now cleaner
- NEW: 3 new directives
  - #SETDYNAMICVAR
  - #DYNAMIC-INCLUDE
  - #LICENSE
- NEW: 1 new library
  - RANDOM
- NEW: 3 new licenses
  - GPLv3
  - MIT
  - UNKNOWN -- used when I don't know which license to use
- NEW: cLua now generates a .licensing file during compilation
1.4.0
- BUGFIX: IFVAR and IFNVAR now actually receive the correct input
- BUGFIX: IFDEF, IFNDEF, IFVAR, and IFNVAR now always find the end of their block
- BUGFIX: cLua now handles invalid source files gracefully
- BUGFIX: more efficient option parsing
- BUGFIX: updater now skips asking where to install if it detects a current install
- CHANGE: timer now measures in ticks and seconds instead of delta gametime
- CHANGE: better timer formatting
- CHANGE: better overall formatting
- CHANGE: all libraries now have credit headers
- CHANGE: usage info is now displayed using textutils.pagedPrint()
- NEW: adjustable logging
- NEW: 10 new command line options
  - --help
  - -?
  - --version
  - --dry-run
  - --quiet
  - --silent
  - --verbose
  - --devel
  - --no-debug
  - --self-update
- NEW: 2 new libraries
  - JSON
  - SPLASH
1.3.0
- BUGFIX: Fixed a crash caused by the --exec option
- BUGFIX: When a crash occurs during option parsing but after logging is enabled, it now creates a new log file
- CHANGE: Logging now supports multiline strings
- CHANGE: Various minor logging changes
- NEW: Add #EXEC directive
- NEW: Add #IFVAR directive
- NEW: Add #IFNVAR directive
- NEW: Add #ENDIFVAR directive
- NEW: Add #ENDIFNVAR directive
- NEW: Errors in the --exec option now reference the specific option that caused the issue
1.2.0
- NEW: Add command line args
  - --log - Enables logging
  - --exec:<code> - Executes arbitrary code before compilation
  - --define:<flag> - Equivalent to #DEFINE
- NEW: Add two libraries to pastebin version (they were already in MPT version):
  - CRC32 - A high-speed hashing API
  - LUABIT - A bitwise API capable of handling 32-bit integers
- NEW: Add compilation timing
1.1.1
- BUGFIX: Line numbers in logs (should) now reference the line in the source instead of their source table key.
- BUGFIX: #SNIPPET no longer claims to ignore itself
- CHANGE: fixed a typo ('beacause' ==> 'because')
- CHANGE: significantly less console spam (no effect on logging verbosity)
- CHANGE: #ELSE, #ELSEIF, and #ELSEIFN now have their own error messages, since the main loop should never encounter them
- NEW: enabled FROM shortcut. Use as #INCLUDE library FROM ~ to load a standard library. Standard libraries are currently only available through MPT.
- MPT Version Only:
  - BUGFIX: no longer crashes under X System (we're now injecting into the kernel instead of startup; I'm working on re-enabling the alias)
  - NEW: now includes two libraries
1.1.0
- BUGFIX: #IFDEF and #IFNDEF no longer destroy the line after their closing directive
- CHANGE: minor directive recognition optimization
- CHANGE: minor #IFDEF and #IFNDEF optimization
- CHANGE: file trimming is now ~2x faster (I merged two loops)
- CHANGE: better logging
- NEW: Set CLUA_LIB global and create /<clua-root>/lib folder (prep for library support)
- NEW: add #SNIPPET directive
- NEW: don't error on #ELSE, #ELSEIF, #ELSEIFN (Planned directives)
- NEW: strip trailing whitespace (may prevent issues with newer directive recognition)
1.0.0
- Initial public release

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