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-- Copyright 2007-2013 Mitchell mitchell.att.foicica.com. See LICENSE.
--[[ This comment is for LuaDoc.
---
-- Extends the `lfs` library to find files in directories.
module('lfs')]]
---
-- The filter table containing common binary file extensions and version control
-- directories to exclude when iterating over files and directories using
-- `dir_foreach` when its `exclude_FILTER` argument is `false`.
-- @see dir_foreach
-- @class table
-- @name FILTER
lfs.FILTER = {
extensions = {
'a', 'bmp', 'bz2', 'class', 'dll', 'exe', 'gif', 'gz', 'jar', 'jpeg', 'jpg',
'o', 'png', 'so', 'tar', 'tgz', 'tif', 'tiff', 'zip'
},
folders = {'%.bzr$', '%.git$', '%.hg$', '%.svn$', 'CVS$'}
}
-- Determines whether or not the given file matches the given filter.
-- @param file The filename.
-- @param filter The filter table.
-- @return boolean `true` or `false`.
local function exclude(file, filter)
if not filter then return false end
local ext = filter.extensions
if ext and ext[file:match('[^%.]+$')] then return true end
for i = 1, #filter do
local patt = filter[i]
if patt:sub(1, 1) ~= '!' then
if file:find(patt) then return true end
else
if not file:find(patt:sub(2)) then return true end
end
end
return false
end
---
-- Iterates over all files and sub-directories in directory *dir*, calling
-- function *f* with each file found.
-- Files passed to *f* do not match any pattern in string or table *filter*,
-- and, unless *exclude_FILTER* is `true`, `FILTER` as well. A filter table
-- contains Lua patterns that match filenames to exclude, an optional `folders`
-- sub-table that contains patterns matching directories to exclude, and an
-- optional `extensions` sub-table that contains raw file extensions to exclude.
-- Any patterns starting with '!' exclude files and directories that do not
-- match the pattern that follows.
-- @param dir The directory path to iterate over.
-- @param f Function to call with each full file path found. If *f* returns
-- `false` explicitly, iteration ceases.
-- @param filter Optional filter for files and directories to exclude.
-- @param exclude_FILTER Optional flag indicating whether or not to exclude the
-- default filter `FILTER` in the search. If `false`, adds `FILTER` to
-- *filter*.
-- The default value is `false` to include the default filter.
-- @param recursing Utility flag indicating whether or not this function has
-- been recursively called. This flag is used and set internally, and should
-- not be set otherwise.
-- @see FILTER
-- @name dir_foreach
function lfs.dir_foreach(dir, f, filter, exclude_FILTER, recursing)
if not recursing then
-- Convert filter to a table from nil or string arguments.
if not filter then filter = {} end
if type(filter) == 'string' then filter = {filter} end
-- Add FILTER to filter unless specified otherwise.
if not exclude_FILTER then
for k, v in pairs(lfs.FILTER) do
if not filter[k] then filter[k] = {} end
local filter_k = filter[k]
for i = 1, #v do filter_k[#filter_k + 1] = v[i] end
end
end
-- Create file extension filter hash table for quick lookups.
local ext = filter.extensions
if ext then for i = 1, #ext do ext[ext[i]] = true end end
end
local lfs_attributes = lfs.attributes
for file in lfs.dir(dir) do
if not file:find('^%.%.?$') then -- ignore . and ..
file = dir..(not WIN32 and '/' or '\\')..file
local type = lfs_attributes(file, 'mode')
if type == 'directory' and not exclude(file, filter.folders) then
lfs.dir_foreach(file, f, filter, nil, true)
elseif type == 'file' and not exclude(file, filter) then
if f(file) == false then return end
end
end
end
end
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