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-- Some file utilities for searching for files recursively and using package.nomsupath
lpeg = require 'lpeg'
re = require 're'
files = {}
_FILE_CACHE = {}
-- Create a fake file and put it in the cache
files.spoof = (filename, contents)->
_FILE_CACHE[filename] = contents
-- Read a file's contents (searching first locally, then in the nomsupath)
files.read = (filename)->
if file_contents = _FILE_CACHE[filename]
return file_contents
if filename == 'stdin'
contents = io.read('*a')
_FILE_CACHE['stdin'] = contents
return contents
file = io.open(filename)
if package.nomsupath and not file
for nomsupath in package.nomsupath\gmatch("[^;]+")
file = io.open(nomsupath.."/"..filename)
break if file
return nil unless file
contents = file\read("*a")
file\close!
_FILE_CACHE[filename] = contents
return contents
iterate_single = (item, prev) -> if item == prev then nil else item
-- `walk` returns an iterator over all files matching a path.
{:match, :gsub} = string
iterate_single = (item, prev) -> if item == prev then nil else item
ok, lfs = pcall(require, "lfs")
if ok
raw_file_exists = (filename)->
mode = lfs.attributes(filename, 'mode')
return if mode == 'file' or mode == 'directory' or mode == 'link' then true else false
files.exists = (path)->
return true if path == 'stdin' or raw_file_exists(path)
if package.nomsupath
for nomsupath in package.nomsupath\gmatch("[^;]+")
return true if raw_file_exists(nomsupath.."/"..path)
return false
-- Return 'true' if any files or directories are found, otherwise 'false', and yield every filename
browse = (filename)->
file_type, err = lfs.attributes(filename, 'mode')
if file_type == 'file'
if match(filename, "%.nom$") or match(filename, "%.lua$")
coroutine.yield filename
return true
elseif file_type == 'directory' or file_type == 'link'
for subfile in lfs.dir(filename)
unless subfile == "." or subfile == ".."
browse(filename.."/"..subfile)
return true
elseif file_type == 'char device'
coroutine.yield(filename)
return true
return false
files.walk = (path)->
if match(path, "%.nom$") or match(path, "%.lua$") or path == 'stdin'
return iterate_single, path
return coroutine.wrap ->
if not browse(path) and package.nomsupath
for nomsupath in package.nomsupath\gmatch("[^;]+")
break if browse(nomsupath.."/"..path)
return nil
else
if io.popen('find . -maxdepth 0')\close!
error "Could not find 'luafilesystem' module and couldn't run system command `find` (this might happen on Windows). Please install `luafilesystem` (which can be found at: http://keplerproject.github.io/luafilesystem/ or `luarocks install luafilesystem`)", 0
-- TODO: improve sanitization
sanitize = (path)->
path = gsub(path,"\\","\\\\")
path = gsub(path,"`","")
path = gsub(path,'"','\\"')
path = gsub(path,"$","")
return path
files.exists = (path)->
return true unless io.popen("ls #{sanitize(path)}")\close!
if package.nomsupath
for nomsupath in package.nomsupath\gmatch("[^;]+")
return true unless io.popen("ls #{nomsupath}/#{sanitize(path)}")\close!
return false
files.walk = (path)->
if match(path, "%.nom$") or match(path, "%.lua$") or path == 'stdin'
return iterate_single, path
path = sanitize(path)
return coroutine.wrap ->
f = io.popen('find -L "'..path..'" -not -path "*/\\.*" -type f -name "*.nom"')
found = false
for line in f\lines!
found = true
coroutine.yield(line)
if not found and package.nomsupath
f\close!
for nomsupath in package.nomsupath\gmatch("[^;]+")
f = io.popen('find -L "'..package.nomsupath..'/'..path..'" -not -path "*/\\.*" -type f -name "*.nom"')
for line in f\lines!
found = true
coroutine.yield(line)
f\close!
break if found
unless found
error("Invalid file path: "..tostring(path))
line_counter = re.compile([[
lines <- {| line (%nl line)* |}
line <- {} (!%nl .)*
]], nl:lpeg.P("\r")^-1 * lpeg.P("\n"))
get_lines = re.compile([[
lines <- {| line (%nl line)* |}
line <- {[^%nl]*}
]], nl:lpeg.P("\r")^-1 * lpeg.P("\n"))
-- LINE_STARTS is a mapping from strings to a table that maps line number to character positions
_LINE_STARTS = {}
files.get_line_starts = (str)->
if type(str) != 'string'
str = tostring(str)
if starts = _LINE_STARTS[str]
return starts
line_starts = line_counter\match(str)
_LINE_STARTS[str] = line_starts
return line_starts
files.get_line_number = (str, pos)->
line_starts = files.get_line_starts(str)
-- Binary search for line number of position
lo, hi = 1, #line_starts
while lo <= hi
mid = math.floor((lo+hi)/2)
if line_starts[mid] > pos
hi = mid-1
else lo = mid+1
return hi
files.get_line = (str, line_no)->
line_starts = files.get_line_starts(str)
return str\sub(line_starts[line_no] or 1, (line_starts[line_no+1] or 1) - 2)
files.get_lines = (str)-> get_lines\match(str)
return files
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