The problem is that the stock Lua distribution (nearly) only includes features that are specified in standard C. Standard C makes no presumptions about there actually being a file system of any specific sort out there (or even an operating system, for that matter), so the os and io modules don't provide access information not available from the standard C library. If you were attempting to code in pure standard C, you would have the same issue.

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There is a chance that you can learn whether the folder exists implicitly from an attempt to use it. If you expect it to exist and be writable to you, then create a temporary file there and if the that succeeds, the folder exists.

If it fails, you might not be able to distinguish a non-existent folder from insufficient permissions, of course. By far the lightest-weight answer to getting a specific answer would be a thin binding to just those OS-specific function calls that provide the information you need. If you can accept the module, then you can like do the binding in otherwise pure Lua.

Simpler, but slightly heavier, is to accept Lua File System. It provides a portable module that supports most things one might want to learn about files and the file system. Et geowizards 102 keygen. Well, the 5.1 reference manual doesn't have anything in, but if you use, you get for precisely what you've explained. If you can afford to fiddle around a bit, or if you know what OS you'll be running on, you might get away with the standard os library's os.execute with some system call that will identify if the file exists.

Even better than os.execute might be os.rename: os.rename(oldname, newname) Renames file named oldname to newname. If this function fails, it returns nil, plus a string describing the error. You could try setting oldname and newname the same -- you might not have write permissions, though, so it might fail because you can't write, even though you can read. In that event, you'd have to parse the returned error string and deduce whether you could write, or you'd have to just try executing your function that needs an existing file, and wrap it in a pcall.

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I use these (but i actually check for the error): require('lfs') -- no function checks for errors.

A subreddit for the. Using for boxes, spoilers, etc. If you actively contribute to a Lua project, and we'll give you flair. “The key benefits unique to Lua are the fact that it is amazingly small, fast, and on a technical level a masterpiece.” “Before you create yet another configuration file or resource format (and yet another parser to accompany it), try Lua.” “If you are ever tempted to put scripting into a program, run don't walk to and use it.” Lua links and stuff • () •, the primary Lua IRC channel •, for all sorts of information about lua, it's sort of disorganized at the moment, so go fix it!

•, what Lua is, why to use it, and what it's good for (sells itself short, methinks) •, the Lua community blog. Resources for beginners: • Lua • Lua: this is for v5.1 and might need an update.

We'll give contributors flair and internet points. • Lua's, extensive documentation of every version of the language. Tools and community projects •, lua's package manager and repository • the •, lua's most notable IDE. •, a lightweight profiler for C, C++, and Lua. • and, the infamous lua trace compiler: Mike Pall's [successful] attempt to prove that dynamic languages can be fast.

•, which aims to be LuaJIT's 'standard library'. Provides modules for data manipulation, audio/video/images/GUI/, and OS bindings. • and, Lua on top of JavaScript: lua.vm.js uses, whereas moonshine is in 'normal' JavaScript. •, Lua implementation in C#, intended for compatibility with •, Lua with almost every library you can think of • A rich programming language the compiles to Lua. Employment and job offers • for game developers, for job offers, for general employment advice/links • Lua development libraries/frameworks • for making deployable executables out of projects written with C, DynASM, Lua, and LuaJIT.

• and, Lua application server on nginx and Lua web framework on openresty •, a Rails-like Lua web framework on nginx, with integrated support for Lua frontends (using Lua-to-JS). • concurrency: for fibers and for green threads •, a modern static type analyzer for Lua (work in progress, but I think it's cool) •, Lua's powerful, expressive, fast and simple parser generator.