If you have io.popen, then this is what I use: function os.capture(cmd, raw) local f = assert(io.popen(cmd, ‘r’)) local s = assert(f:read(‘*a’)) f:close() if raw then return s end s = string.gsub(s, ‘^%s+’, ”) s = string.gsub(s, ‘%s+$’, ”) s = string.gsub(s, ‘[\n\r]+’, ‘ ‘) return s end If you don’t have io.popen, then presumably … Read more
There’s a good discussion at Lambda the Ultimate. LuaJIT is very good. Many people have reported impressive speedups on lua-l (the lua mailing list). The speedups are most impressive for pure Lua code; the trace compiler is not as effective when there are lots of calls to C functions in loadable library modules.
Overcomplicated answers much? Here is my implementation: function TableConcat(t1,t2) for i=1,#t2 do t1[#t1+1] = t2[i] end return t1 end
LuaJ is easy to embed in Java. I did have to change a few lines of their source to get it to work how I expected (it didn’t require the IO library automatically). http://sourceforge.net/projects/luaj/
That is the length operator: The length operator is denoted by the unary operator #. The length of a string is its number of bytes (that is, the usual meaning of string length when each character is one byte). The length of a table t is defined to be any integer index n such that … Read more
y = y.long() does the job. There are similar methods for other data types, such as int, char, float and byte. You can check different dtypes here.
There is a way of deducing the “local path” of a file (more concretely, the string that was used to load the file). If you are requiring a file inside lib.foo.bar, you might be doing something like this: require ‘lib.foo.bar’ Then you can get the path to the file as the first element (and only) … Read more
Try: name = “^aH^ai” name = name:gsub(“%^a”, “”) See also: http://lua-users.org/wiki/StringLibraryTutorial
You can use ls -lrt -d -1 “$PWD”/{*,.*} It will also catch hidden files.
Since you say “embedded system” and “small and fast” and “integrate nicely” I would say you are correct that Lua is the number one if not the only choice. But I no longer agree that the programming language has “quirky corners”. Firstly, the book Programming in Lua is simply splendid, one of the best books … Read more