Walk a directory/Recursively: Difference between revisions

=={{header|Lua}}==

Lua provides functions such as os.execute([command]) and io.popen(prog [, mode]). Below an example for Windows users having io.popen at their disposal. Mind you, it may pop-up a command window.

<lang Lua>-- Gets the output of given program as string

-- Note that io.popen is not available on all platforms

local function getOutput(prog)

local file = assert(io.popen(prog, "r"))

local output = assert(file:read("*a"))

file:close()

return output

end

-- Iterates files in given directory

local function files(directory, recursively)

-- Use windows" dir command

local directory = directory:gsub("/", "\\")

local filenames = getOutput(string.format("dir %s %s/B/A:A", directory, recursively and '/S' or ''))

-- Function to be called in "for filename in files(directory)"

return coroutine.wrap(function()

for filename in filenames:gmatch("([^\r\n]+)") do

coroutine.yield(filename)

end

end)

end

-- Walk "C:/Windows" looking for executables

local directory = "C:/Windows"

local pattern = ".*%.exe$" -- for finding executables

for filename in files(directory, true) do

if filename:match(pattern) then

print(filename)

end

end</lang>