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-- Copyright 2007-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--[[ This comment is for LuaDoc.
---
-- Extends the `lfs` library to find files in directories and determine absolute
-- file paths.
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$'}
}
local lfs_symlinkattributes = lfs.symlinkattributes
-- Determines whether or not the given file matches the given filter.
-- @param file The filename.
-- @param filter The filter table.
-- @return boolean `true` or `false`.
local function exclude(file, filter)
if not filter then return false end
local ext = filter.extensions
if ext and ext[file:match('[^%.]+$')] 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 filter.symlink and lfs_symlinkattributes(file, 'mode') == 'link'
end
---
-- Iterates over all files and sub-directories (up to *n* levels deep) 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`, `lfs.FILTER` as well. A filter table
-- contains:
--
-- + Lua patterns that match filenames to exclude.
-- + Optional `folders` sub-table that contains patterns matching directories
-- to exclude.
-- + Optional `extensions` sub-table that contains raw file extensions to
-- exclude.
-- + Optional `symlink` flag that when `true`, excludes symlinked files (but
-- not symlinked directories).
-- + Optional `folders.symlink` flag that when `true`, excludes symlinked
-- directories.
--
-- Any filter 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 `lfs.FILTER` in the search. If `false`, adds `lfs.FILTER` to
-- *filter*.
-- The default value is `false` to include the default filter.
-- @param n Optional maximum number of directory levels to descend into.
-- The default value is `nil`, which indicates no limit.
-- @param include_dirs Optional flag indicating whether or not to call *f* with
-- directory names too. Directory names are passed with a trailing '/' or '\',
-- depending on the current platform.
-- The default value is `false`.
-- @param level Utility value indicating the directory level this function is
-- at. This value 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, n, include_dirs, level)
if not level then level = 0 end
if level == 0 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 type(v) == 'table' then
if not filter[k] then filter[k] = {} end
local filter_k = filter[k]
for k2, v2 in pairs(v) do
filter_k[tonumber(k2) and #filter_k + 1 or k2] = v2
end
else
filter[tonumber(k) and #filter + 1 or k] = v
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 dir_sep, lfs_attributes = not WIN32 and '/' or '\\', lfs.attributes
for basename in lfs.dir(dir) do
if not basename:find('^%.%.?$') then -- ignore . and ..
local filename = dir..(dir ~= '/' and dir_sep or '')..basename
local mode = lfs_attributes(filename, 'mode')
if mode == 'directory' and not exclude(filename, filter.folders) then
if include_dirs and f(filename..dir_sep) == false then return end
if not n or level < n then
lfs.dir_foreach(filename, f, filter, nil, n, include_dirs, level + 1)
end
elseif mode == 'file' and not exclude(filename, filter) then
if f(filename) == false then return end
end
end
end
end
---
-- Returns the absolute path to string *filename*.
-- *prefix* or `lfs.currentdir()` is prepended to a relative filename. The
-- returned path is not guaranteed to exist.
-- @param filename The relative or absolute path to a file.
-- @param prefix Optional prefix path prepended to a relative filename.
-- @return string absolute path
-- @name abspath
function lfs.abspath(filename, prefix)
if WIN32 then filename = filename:gsub('/', '\\') end
if not filename:find(not WIN32 and '^/' or '^%a:[/\\]') and
not (WIN32 and filename:find('^\\\\')) then
prefix = prefix or lfs.currentdir()
filename = prefix..(not WIN32 and '/' or '\\')..filename
end
filename = filename:gsub('%f[^/\\]%.[/\\]', '') -- clean up './'
while filename:find('[^/\\]+[/\\]%.%.[/\\]') do
filename = filename:gsub('[^/\\]+[/\\]%.%.[/\\]', '', 1) -- clean up '../'
end
return filename
end
|
