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|
if not modules then modules = { } end modules ['l-file'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- needs a cleanup
file = file or { }
local file = file
local insert, concat = table.insert, table.concat
local find, gmatch, match, gsub, sub, char, lower = string.find, string.gmatch, string.match, string.gsub, string.sub, string.char, string.lower
local lpegmatch = lpeg.match
local getcurrentdir, attributes = lfs.currentdir, lfs.attributes
local P, R, S, C, Cs, Cp, Cc = lpeg.P, lpeg.R, lpeg.S, lpeg.C, lpeg.Cs, lpeg.Cp, lpeg.Cc
local function dirname(name,default)
return match(name,"^(.+)[/\\].-$") or (default or "")
end
local function basename(name)
return match(name,"^.+[/\\](.-)$") or name
end
local function nameonly(name)
return (gsub(match(name,"^.+[/\\](.-)$") or name,"%..*$",""))
end
local function extname(name,default)
return match(name,"^.+%.([^/\\]-)$") or default or ""
end
local function splitname(name)
local n, s = match(name,"^(.+)%.([^/\\]-)$")
return n or name, s or ""
end
file.basename = basename
file.dirname = dirname
file.nameonly = nameonly
file.extname = extname
file.suffix = extname
function file.removesuffix(filename)
return (gsub(filename,"%.[%a%d]+$",""))
end
function file.addsuffix(filename, suffix, criterium)
if not suffix or suffix == "" then
return filename
elseif criterium == true then
return filename .. "." .. suffix
elseif not criterium then
local n, s = splitname(filename)
if not s or s == "" then
return filename .. "." .. suffix
else
return filename
end
else
local n, s = splitname(filename)
if s and s ~= "" then
local t = type(criterium)
if t == "table" then
-- keep if in criterium
for i=1,#criterium do
if s == criterium[i] then
return filename
end
end
elseif t == "string" then
-- keep if criterium
if s == criterium then
return filename
end
end
end
return n .. "." .. suffix
end
end
--~ print("1 " .. file.addsuffix("name","new") .. " -> name.new")
--~ print("2 " .. file.addsuffix("name.old","new") .. " -> name.old")
--~ print("3 " .. file.addsuffix("name.old","new",true) .. " -> name.old.new")
--~ print("4 " .. file.addsuffix("name.old","new","new") .. " -> name.new")
--~ print("5 " .. file.addsuffix("name.old","new","old") .. " -> name.old")
--~ print("6 " .. file.addsuffix("name.old","new","foo") .. " -> name.new")
--~ print("7 " .. file.addsuffix("name.old","new",{"foo","bar"}) .. " -> name.new")
--~ print("8 " .. file.addsuffix("name.old","new",{"old","bar"}) .. " -> name.old")
function file.replacesuffix(filename, suffix)
return (gsub(filename,"%.[%a%d]+$","")) .. "." .. suffix
end
--~ function file.join(...)
--~ local pth = concat({...},"/")
--~ pth = gsub(pth,"\\","/")
--~ local a, b = match(pth,"^(.*://)(.*)$")
--~ if a and b then
--~ return a .. gsub(b,"//+","/")
--~ end
--~ a, b = match(pth,"^(//)(.*)$")
--~ if a and b then
--~ return a .. gsub(b,"//+","/")
--~ end
--~ return (gsub(pth,"//+","/"))
--~ end
local trick_1 = char(1)
local trick_2 = "^" .. trick_1 .. "/+"
function file.join(...)
local lst = { ... }
local a, b = lst[1], lst[2]
if a == "" then
lst[1] = trick_1
elseif b and find(a,"^/+$") and find(b,"^/") then
lst[1] = ""
lst[2] = gsub(b,"^/+","")
end
local pth = concat(lst,"/")
pth = gsub(pth,"\\","/")
local a, b = match(pth,"^(.*://)(.*)$")
if a and b then
return a .. gsub(b,"//+","/")
end
a, b = match(pth,"^(//)(.*)$")
if a and b then
return a .. gsub(b,"//+","/")
end
pth = gsub(pth,trick_2,"")
return (gsub(pth,"//+","/"))
end
--~ print(file.join("//","/y"))
--~ print(file.join("/","/y"))
--~ print(file.join("","/y"))
--~ print(file.join("/x/","/y"))
--~ print(file.join("x/","/y"))
--~ print(file.join("http://","/y"))
--~ print(file.join("http://a","/y"))
--~ print(file.join("http:///a","/y"))
--~ print(file.join("//nas-1","/y"))
function file.is_writable(name)
if lfs.isdir(name) then
name = name .. "/m_t_x_t_e_s_t.tmp"
local f = io.open(name,"wb")
if f then
f:close()
os.remove(name)
return true
end
else
local existing = lfs.isfile(name)
f = io.open(name,"ab")
if f then
f:close()
if not existing then os.remove(name) end
return true
end
end
return false
end
function file.is_readable(name)
local a = attributes(name)
return a and sub(a.permissions,1,1) == "r"
end
file.isreadable = file.is_readable -- depricated
file.iswritable = file.is_writable -- depricated
-- todo: lpeg \\ / .. does not save much
local checkedsplit = string.checkedsplit
function file.splitpath(str,separator) -- string
str = gsub(str,"\\","/")
return checkedsplit(str,separator or io.pathseparator)
end
function file.joinpath(tab,separator) -- table
return concat(tab,separator or io.pathseparator) -- can have trailing //
end
-- we can hash them weakly
--~ function file.collapsepath(str) -- fails on b.c/..
--~ str = gsub(str,"\\","/")
--~ if find(str,"/") then
--~ str = gsub(str,"^%./",(gsub(getcurrentdir(),"\\","/")) .. "/") -- ./xx in qualified
--~ str = gsub(str,"/%./","/")
--~ local n, m = 1, 1
--~ while n > 0 or m > 0 do
--~ str, n = gsub(str,"[^/%.]+/%.%.$","")
--~ str, m = gsub(str,"[^/%.]+/%.%./","")
--~ end
--~ str = gsub(str,"([^/])/$","%1")
--~ -- str = gsub(str,"^%./","") -- ./xx in qualified
--~ str = gsub(str,"/%.$","")
--~ end
--~ if str == "" then str = "." end
--~ return str
--~ end
--~
--~ The previous one fails on "a.b/c" so Taco came up with a split based
--~ variant. After some skyping we got it sort of compatible with the old
--~ one. After that the anchoring to currentdir was added in a better way.
--~ Of course there are some optimizations too. Finally we had to deal with
--~ windows drive prefixes and thinsg like sys://.
function file.collapsepath(str,anchor)
if anchor and not find(str,"^/") and not find(str,"^%a:") then
str = getcurrentdir() .. "/" .. str
end
if str == "" or str =="." then
return "."
elseif find(str,"^%.%.") then
str = gsub(str,"\\","/")
return str
elseif not find(str,"%.") then
str = gsub(str,"\\","/")
return str
end
str = gsub(str,"\\","/")
local starter, rest = match(str,"^(%a+:/*)(.-)$")
if starter then
str = rest
end
local oldelements = checkedsplit(str,"/")
local newelements = { }
local i = #oldelements
while i > 0 do
local element = oldelements[i]
if element == '.' then
-- do nothing
elseif element == '..' then
local n = i -1
while n > 0 do
local element = oldelements[n]
if element ~= '..' and element ~= '.' then
oldelements[n] = '.'
break
else
n = n - 1
end
end
if n < 1 then
insert(newelements,1,'..')
end
elseif element ~= "" then
insert(newelements,1,element)
end
i = i - 1
end
if #newelements == 0 then
return starter or "."
elseif starter then
return starter .. concat(newelements, '/')
elseif find(str,"^/") then
return "/" .. concat(newelements,'/')
else
return concat(newelements, '/')
end
end
--~ local function test(str)
--~ print(string.format("%-20s %-15s %-15s",str,file.collapsepath(str),file.collapsepath(str,true)))
--~ end
--~ test("a/b.c/d") test("b.c/d") test("b.c/..")
--~ test("/") test("c:/..") test("sys://..")
--~ test("") test("./") test(".") test("..") test("./..") test("../..")
--~ test("a") test("./a") test("/a") test("a/../..")
--~ test("a/./b/..") test("a/aa/../b/bb") test("a/.././././b/..") test("a/./././b/..")
--~ test("a/b/c/../..") test("./a/b/c/../..") test("a/b/c/../..")
function file.robustname(str,strict)
str = gsub(str,"[^%a%d%/%-%.\\]+","-")
if strict then
return lower(gsub(str,"^%-*(.-)%-*$","%1"))
else
return str
end
end
file.readdata = io.loaddata
file.savedata = io.savedata
function file.copy(oldname,newname)
file.savedata(newname,io.loaddata(oldname))
end
-- lpeg variants, slightly faster, not always
--~ local period = P(".")
--~ local slashes = S("\\/")
--~ local noperiod = 1-period
--~ local noslashes = 1-slashes
--~ local name = noperiod^1
--~ local pattern = (noslashes^0 * slashes)^0 * (noperiod^1 * period)^1 * C(noperiod^1) * -1
--~ function file.extname(name)
--~ return lpegmatch(pattern,name) or ""
--~ end
--~ local pattern = Cs(((period * noperiod^1 * -1)/"" + 1)^1)
--~ function file.removesuffix(name)
--~ return lpegmatch(pattern,name)
--~ end
--~ local pattern = (noslashes^0 * slashes)^1 * C(noslashes^1) * -1
--~ function file.basename(name)
--~ return lpegmatch(pattern,name) or name
--~ end
--~ local pattern = (noslashes^0 * slashes)^1 * Cp() * noslashes^1 * -1
--~ function file.dirname(name)
--~ local p = lpegmatch(pattern,name)
--~ if p then
--~ return sub(name,1,p-2)
--~ else
--~ return ""
--~ end
--~ end
--~ local pattern = (noslashes^0 * slashes)^0 * (noperiod^1 * period)^1 * Cp() * noperiod^1 * -1
--~ function file.addsuffix(name, suffix)
--~ local p = lpegmatch(pattern,name)
--~ if p then
--~ return name
--~ else
--~ return name .. "." .. suffix
--~ end
--~ end
--~ local pattern = (noslashes^0 * slashes)^0 * (noperiod^1 * period)^1 * Cp() * noperiod^1 * -1
--~ function file.replacesuffix(name,suffix)
--~ local p = lpegmatch(pattern,name)
--~ if p then
--~ return sub(name,1,p-2) .. "." .. suffix
--~ else
--~ return name .. "." .. suffix
--~ end
--~ end
--~ local pattern = (noslashes^0 * slashes)^0 * Cp() * ((noperiod^1 * period)^1 * Cp() + P(true)) * noperiod^1 * -1
--~ function file.nameonly(name)
--~ local a, b = lpegmatch(pattern,name)
--~ if b then
--~ return sub(name,a,b-2)
--~ elseif a then
--~ return sub(name,a)
--~ else
--~ return name
--~ end
--~ end
--~ local test = file.extname
--~ local test = file.basename
--~ local test = file.dirname
--~ local test = file.addsuffix
--~ local test = file.replacesuffix
--~ local test = file.nameonly
--~ print(1,test("./a/b/c/abd.def.xxx","!!!"))
--~ print(2,test("./../b/c/abd.def.xxx","!!!"))
--~ print(3,test("a/b/c/abd.def.xxx","!!!"))
--~ print(4,test("a/b/c/def.xxx","!!!"))
--~ print(5,test("a/b/c/def","!!!"))
--~ print(6,test("def","!!!"))
--~ print(7,test("def.xxx","!!!"))
--~ local tim = os.clock() for i=1,250000 do local ext = test("abd.def.xxx","!!!") end print(os.clock()-tim)
-- also rewrite previous
local letter = R("az","AZ") + S("_-+")
local separator = P("://")
local qualified = P(".")^0 * P("/") + letter*P(":") + letter^1*separator + letter^1 * P("/")
local rootbased = P("/") + letter*P(":")
lpeg.patterns.qualified = qualified
lpeg.patterns.rootbased = rootbased
-- ./name ../name /name c: :// name/name
function file.is_qualified_path(filename)
return lpegmatch(qualified,filename) ~= nil
end
function file.is_rootbased_path(filename)
return lpegmatch(rootbased,filename) ~= nil
end
-- actually these are schemes
local slash = S("\\/")
local period = P(".")
local drive = C(R("az","AZ")) * P(":")
local path = C(((1-slash)^0 * slash)^0)
local suffix = period * C(P(1-period)^0 * P(-1))
local base = C((1-suffix)^0)
local pattern = (drive + Cc("")) * (path + Cc("")) * (base + Cc("")) * (suffix + Cc(""))
function file.splitname(str) -- returns drive, path, base, suffix
return lpegmatch(pattern,str)
end
-- function test(t) for k, v in next, t do print(v, "=>", file.splitname(v)) end end
--
-- test { "c:", "c:/aa", "c:/aa/bb", "c:/aa/bb/cc", "c:/aa/bb/cc.dd", "c:/aa/bb/cc.dd.ee" }
-- test { "c:", "c:aa", "c:aa/bb", "c:aa/bb/cc", "c:aa/bb/cc.dd", "c:aa/bb/cc.dd.ee" }
-- test { "/aa", "/aa/bb", "/aa/bb/cc", "/aa/bb/cc.dd", "/aa/bb/cc.dd.ee" }
-- test { "aa", "aa/bb", "aa/bb/cc", "aa/bb/cc.dd", "aa/bb/cc.dd.ee" }
--~ -- todo:
--~
--~ if os.type == "windows" then
--~ local currentdir = getcurrentdir
--~ function getcurrentdir()
--~ return (gsub(currentdir(),"\\","/"))
--~ end
--~ end
-- for myself:
function file.strip(name,dir)
local b, a = match(name,"^(.-)" .. dir .. "(.*)$")
return a ~= "" and a or name
end
|