Merge remote branch 'github/master'

8 files changed, 367 insertions, 158 deletions

diff --git a/luaextra-aux.lua b/luaextra-aux.lua
index 1ff5c08..7950a03 100644
--- a/luaextra-aux.lua
+++ b/luaextra-aux.lua
@@ -6,19 +6,30 @@ if not modules then modules = { } end modules ['l-aux'] = {
     license   = "see context related readme files"
 }
 
+-- for inline, no store split : for s in string.gmatch(str,",* *([^,]+)") do .. end
+
 aux = aux or { }
 
 local concat, format, gmatch = table.concat, string.format, string.gmatch
 local tostring, type = tostring, type
 local lpegmatch = lpeg.match
 
+local P, R, V = lpeg.P, lpeg.R, lpeg.V
+
+local escape, left, right = P("\\"), P('{'), P('}')
+
+lpeg.patterns.balanced = P {
+    [1] = ((escape * (left+right)) + (1 - (left+right)) + V(2))^0,
+    [2] = left * V(1) * right
+}
+
 local space     = lpeg.P(' ')
 local equal     = lpeg.P("=")
 local comma     = lpeg.P(",")
 local lbrace    = lpeg.P("{")
 local rbrace    = lpeg.P("}")
 local nobrace   = 1 - (lbrace+rbrace)
-local nested    = lpeg.P{ lbrace * (nobrace + lpeg.V(1))^0 * rbrace }
+local nested    = lpeg.P { lbrace * (nobrace + lpeg.V(1))^0 * rbrace }
 local spaces    = space^0
 
 local value     = lpeg.P(lbrace * lpeg.C((nobrace + nested)^0) * rbrace) + lpeg.C((nested + (1-comma))^0)
@@ -98,6 +109,8 @@ local pattern   = lpeg.Ct(value*(separator*value)^0)
 
 aux.settings_to_array_pattern = pattern
 
+-- we could use a weak table as cache
+
 function aux.settings_to_array(str)
     if not str or str == "" then
         return { }
@@ -182,21 +195,14 @@ end
 
 -- temporary here
 
-local digit    = lpeg.R("09")
-local period   = lpeg.P(".")
-local zero     = lpeg.P("0")
-
---~ local finish   = lpeg.P(-1)
---~ local nodigit  = (1-digit) + finish
---~ local case_1   = (period * zero^1 * #nodigit)/"" -- .000
---~ local case_2   = (period * (1-(zero^0/"") * #nodigit)^1 * (zero^0/"") * nodigit) -- .010 .10 .100100
-
+local digit         = lpeg.R("09")
+local period        = lpeg.P(".")
+local zero          = lpeg.P("0")
 local trailingzeros = zero^0 * -digit -- suggested by Roberto R
-local case_1 = period * trailingzeros / ""
-local case_2 = period * (digit - trailingzeros)^1 * (trailingzeros / "")
-
-local number   = digit^1 * (case_1 + case_2)
-local stripper = lpeg.Cs((number + 1)^0)
+local case_1        = period * trailingzeros / ""
+local case_2        = period * (digit - trailingzeros)^1 * (trailingzeros / "")
+local number        = digit^1 * (case_1 + case_2)
+local stripper      = lpeg.Cs((number + 1)^0)
 
 --~ local sample = "bla 11.00 bla 11 bla 0.1100 bla 1.00100 bla 0.00 bla 0.001 bla 1.1100 bla 0.100100100 bla 0.00100100100"
 --~ collectgarbage("collect")
@@ -205,6 +211,8 @@ local stripper = lpeg.Cs((number + 1)^0)
 --~ lpegmatch(stripper,str)
 --~ print(#str, os.clock()-ts, lpegmatch(stripper,sample))
 
+lpeg.patterns.strip_zeros = stripper
+
 function aux.strip_zeros(str)
     return lpegmatch(stripper,str)
 end
diff --git a/luaextra-dimen.lua b/luaextra-dimen.lua
index e15e294..a8faa27 100644
--- a/luaextra-dimen.lua
+++ b/luaextra-dimen.lua
@@ -16,7 +16,7 @@ table.</p>
 --ldx]]--
 
 local format, match, gsub, type, setmetatable = string.format, string.match, string.gsub, type, setmetatable
-local lpegmatch = lpeg.match
+local P, S, R, Cc, lpegmatch = lpeg.P, lpeg.S, lpeg.R, lpeg.Cc, lpeg.match
 
 number = number or { }
 
@@ -100,6 +100,7 @@ end
 <p>We collect a bunch of converters in the <type>number</type> namespace.</p>
 --ldx]]--
 
+number.maxdimen     = 1073741823
 number.todimen      = todimen
 number.dimenfactors = dimenfactors
 
@@ -124,10 +125,12 @@ a number and optionally a unit. When no unit is given a constant
 capture takes place.</p>
 --ldx]]--
 
-local amount = (lpeg.S("+-")^0 * lpeg.R("09")^0 * lpeg.P(".")^0 * lpeg.R("09")^0) + lpeg.Cc("0")
-local unit   = lpeg.R("az")^1
+local amount = (S("+-")^0 * R("09")^0 * P(".")^0 * R("09")^0) + Cc("0")
+local unit   = R("az")^1
 
-local pattern = amount/tonumber * (unit^1/dimenfactors + lpeg.Cc(1)) -- tonumber is new
+local pattern = amount/tonumber * (unit^1/dimenfactors + Cc(1)) -- tonumber is new
+
+lpeg.patterns.dimenpair = pattern
 
 --[[ldx--
 <p>We use a metatable to intercept errors. When no key is found in
@@ -147,11 +150,18 @@ function string:todimen()
         return self
     else
         local value, unit = lpegmatch(pattern,self)
-        print(value,unit)
         return value/unit
     end
 end
 
+local amount = S("+-")^0 * R("09")^0 * S(".,")^0 * R("09")^0
+local unit   = P("pt") + P("cm") + P("mm") + P("sp") + P("bp") + P("in")  +
+               P("pc") + P("dd") + P("cc") + P("nd") + P("nc")
+
+local pattern = amount * unit
+
+lpeg.patterns.validdimen = pattern
+
 --[[ldx--
 <p>This converter accepts calls like:</p>
 
diff --git a/luaextra-dir.lua b/luaextra-dir.lua
index 3760db2..0d08362 100644
--- a/luaextra-dir.lua
+++ b/luaextra-dir.lua
@@ -6,6 +6,8 @@ if not modules then modules = { } end modules ['l-dir'] = {
     license   = "see context related readme files"
 }
 
+-- dir.expand_name will be merged with cleanpath and collapsepath
+
 local type = type
 local find, gmatch, match, gsub = string.find, string.gmatch, string.match, string.gsub
 local lpegmatch = lpeg.match
@@ -174,7 +176,7 @@ end
 
 local make_indeed = true -- false
 
-if string.find(os.getenv("PATH"),";") then
+if string.find(os.getenv("PATH"),";") then -- os.type == "windows"
 
     function dir.mkdirs(...)
         local str, pth = "", ""
@@ -241,7 +243,7 @@ if string.find(os.getenv("PATH"),";") then
 --~         print(dir.mkdirs("///a/b/c"))
 --~         print(dir.mkdirs("a/bbb//ccc/"))
 
-    function dir.expand_name(str)
+    function dir.expand_name(str) -- will be merged with cleanpath and collapsepath
         local first, nothing, last = match(str,"^(//)(//*)(.*)$")
         if first then
             first = lfs.currentdir() .. "/"
@@ -323,7 +325,7 @@ else
 --~         print(dir.mkdirs("///a/b/c"))
 --~         print(dir.mkdirs("a/bbb//ccc/"))
 
-    function dir.expand_name(str)
+    function dir.expand_name(str) -- will be merged with cleanpath and collapsepath
         if not find(str,"^/") then
             str = lfs.currentdir() .. "/" .. str
         end
diff --git a/luaextra-file.lua b/luaextra-file.lua
index c95ef65..6f5f5d0 100644
--- a/luaextra-file.lua
+++ b/luaextra-file.lua
@@ -11,7 +11,7 @@ if not modules then modules = { } end modules ['l-file'] = {
 file = file or { }
 
 local concat = table.concat
-local find, gmatch, match, gsub, sub = string.find, string.gmatch, string.match, string.gsub, string.sub
+local find, gmatch, match, gsub, sub, char = string.find, string.gmatch, string.match, string.gsub, string.sub, string.char
 local lpegmatch = lpeg.match
 
 function file.removesuffix(filename)
@@ -19,7 +19,9 @@ function file.removesuffix(filename)
 end
 
 function file.addsuffix(filename, suffix)
-    if not find(filename,"%.[%a%d]+$") then
+    if not suffix or suffix == "" then
+        return filename
+    elseif not find(filename,"%.[%a%d]+$") then
         return filename .. "." .. suffix
     else
         return filename
@@ -48,14 +50,33 @@ end
 
 file.suffix = file.extname
 
---~ 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.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 pth = concat({...},"/")
+    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
@@ -65,9 +86,20 @@ function file.join(...)
     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.iswritable(name)
     local a = lfs.attributes(name) or lfs.attributes(file.dirname(name,"."))
     return a and sub(a.permissions,2,2) == "w"
@@ -106,16 +138,22 @@ function file.join_path(tab)
     return concat(tab,io.pathseparator) -- can have trailing //
 end
 
+-- we can hash them weakly
+
 function file.collapse_path(str)
-    str = gsub(str,"/%./","/")
-    local n, m = 1, 1
-    while n > 0 or m > 0 do
-        str, n = gsub(str,"[^/%.]+/%.%.$","")
-        str, m = gsub(str,"[^/%.]+/%.%./","")
+    str = gsub(str,"\\","/")
+    if find(str,"/") then
+        str = gsub(str,"^%./",(gsub(lfs.currentdir(),"\\","/")) .. "/") -- ./xx in qualified
+        str = gsub(str,"/%./","/")
+        local n, m = 1, 1
+        while n > 0 or m > 0 do
+            str, n = gsub(str,"[^/%.]+/%.%.$","")
+            str, m = gsub(str,"[^/%.]+/%.%./","")
+        end
+        str = gsub(str,"([^/])/$","%1")
+    --  str = gsub(str,"^%./","") -- ./xx in qualified
+        str = gsub(str,"/%.$","")
     end
-    str = gsub(str,"([^/])/$","%1")
-    str = gsub(str,"^%./","")
-    str = gsub(str,"/%.$","")
     if str == "" then str = "." end
     return str
 end
@@ -265,3 +303,12 @@ end
 -- 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 = lfs.currentdir
+--~     function lfs.currentdir()
+--~         return (gsub(currentdir(),"\\","/"))
+--~     end
+--~ end
diff --git a/luaextra-lpeg.lua b/luaextra-lpeg.lua
index 9e761e4..2e366a9 100644
--- a/luaextra-lpeg.lua
+++ b/luaextra-lpeg.lua
@@ -6,55 +6,58 @@ if not modules then modules = { } end modules ['l-lpeg'] = {
     license   = "see context related readme files"
 }
 
-lpeg = require("lpeg")
+local lpeg = require("lpeg")
 
-local P, R, S, Ct, C, Cs, Cc = lpeg.P, lpeg.R, lpeg.S, lpeg.Ct, lpeg.C, lpeg.Cs, lpeg.Cc
-local match = lpeg.match
-
---~ l-lpeg.lua :
+lpeg.patterns  = lpeg.patterns or { } -- so that we can share
+local patterns = lpeg.patterns
 
---~ lpeg.digit         = lpeg.R('09')^1
---~ lpeg.sign          = lpeg.S('+-')^1
---~ lpeg.cardinal      = lpeg.P(lpeg.sign^0 * lpeg.digit^1)
---~ lpeg.integer       = lpeg.P(lpeg.sign^0 * lpeg.digit^1)
---~ lpeg.float         = lpeg.P(lpeg.sign^0 * lpeg.digit^0 * lpeg.P('.') * lpeg.digit^1)
---~ lpeg.number        = lpeg.float + lpeg.integer
---~ lpeg.oct           = lpeg.P("0") * lpeg.R('07')^1
---~ lpeg.hex           = lpeg.P("0x") * (lpeg.R('09') + lpeg.R('AF'))^1
---~ lpeg.uppercase     = lpeg.P("AZ")
---~ lpeg.lowercase     = lpeg.P("az")
-
---~ lpeg.eol           = lpeg.S('\r\n\f')^1 -- includes formfeed
---~ lpeg.space         = lpeg.S(' ')^1
---~ lpeg.nonspace      = lpeg.P(1-lpeg.space)^1
---~ lpeg.whitespace    = lpeg.S(' \r\n\f\t')^1
---~ lpeg.nonwhitespace = lpeg.P(1-lpeg.whitespace)^1
+local P, R, S, Ct, C, Cs, Cc, V = lpeg.P, lpeg.R, lpeg.S, lpeg.Ct, lpeg.C, lpeg.Cs, lpeg.Cc, lpeg.V
+local match = lpeg.match
 
-local hash = { }
+local digit, sign      = R('09'), S('+-')
+local cr, lf, crlf     = P("\r"), P("\n"), P("\r\n")
+local utf8byte         = R("\128\191")
+
+patterns.utf8byte      = utf8byte
+patterns.utf8one       = R("\000\127")
+patterns.utf8two       = R("\194\223") * utf8byte
+patterns.utf8three     = R("\224\239") * utf8byte * utf8byte
+patterns.utf8four      = R("\240\244") * utf8byte * utf8byte * utf8byte
+
+patterns.digit         = digit
+patterns.sign          = sign
+patterns.cardinal      = sign^0 * digit^1
+patterns.integer       = sign^0 * digit^1
+patterns.float         = sign^0 * digit^0 * P('.') * digit^1
+patterns.number        = patterns.float + patterns.integer
+patterns.oct           = P("0") * R("07")^1
+patterns.octal         = patterns.oct
+patterns.HEX           = P("0x") * R("09","AF")^1
+patterns.hex           = P("0x") * R("09","af")^1
+patterns.hexadecimal   = P("0x") * R("09","AF","af")^1
+patterns.lowercase     = R("az")
+patterns.uppercase     = R("AZ")
+patterns.letter        = patterns.lowercase + patterns.uppercase
+patterns.space         = S(" ")
+patterns.eol           = S("\n\r")
+patterns.spacer        = S(" \t\f\v")  -- + string.char(0xc2, 0xa0) if we want utf (cf mail roberto)
+patterns.newline       = crlf + cr + lf
+patterns.nonspace      = 1 - patterns.space
+patterns.nonspacer     = 1 - patterns.spacer
+patterns.whitespace    = patterns.eol + patterns.spacer
+patterns.nonwhitespace = 1 - patterns.whitespace
+patterns.utf8          = patterns.utf8one + patterns.utf8two + patterns.utf8three + patterns.utf8four
+patterns.utfbom        = P('\000\000\254\255') + P('\255\254\000\000') + P('\255\254') + P('\254\255') + P('\239\187\191')
 
 function lpeg.anywhere(pattern) --slightly adapted from website
-    return P { P(pattern) + 1 * lpeg.V(1) }
-end
-
-function lpeg.startswith(pattern) --slightly adapted
-    return P(pattern)
+    return P { P(pattern) + 1 * V(1) } -- why so complex?
 end
 
 function lpeg.splitter(pattern, action)
     return (((1-P(pattern))^1)/action+1)^0
 end
 
--- variant:
-
---~ local parser = lpeg.Ct(lpeg.splitat(newline))
-
-local crlf     = P("\r\n")
-local cr       = P("\r")
-local lf       = P("\n")
-local space    = S(" \t\f\v")  -- + string.char(0xc2, 0xa0) if we want utf (cf mail roberto)
-local newline  = crlf + cr + lf
-local spacing  = space^0 * newline
-
+local spacing  = patterns.spacer^0 * patterns.newline -- sort of strip
 local empty    = spacing * Cc("")
 local nonempty = Cs((1-spacing)^1) * spacing^-1
 local content  = (empty + nonempty)^1
@@ -65,7 +68,7 @@ function string:splitlines()
     return match(capture,self)
 end
 
-lpeg.linebyline = content -- better make a sublibrary
+patterns.textline = content
 
 --~ local p = lpeg.splitat("->",false)  print(match(p,"oeps->what->more"))  -- oeps what more
 --~ local p = lpeg.splitat("->",true)   print(match(p,"oeps->what->more"))  -- oeps what->more
@@ -121,45 +124,20 @@ end
 --~     local p = pp
 --~     for l=1,#list do
 --~         if p then
---~             p = p + lpeg.P(list[l])
+--~             p = p + P(list[l])
 --~         else
---~             p = lpeg.P(list[l])
+--~             p = P(list[l])
 --~         end
 --~     end
 --~     return p
 --~ end
 
 --~ from roberto's site:
---~
---~ -- decode a two-byte UTF-8 sequence
---~ local function f2 (s)
---~   local c1, c2 = string.byte(s, 1, 2)
---~   return c1 * 64 + c2 - 12416
---~ end
---~
---~ -- decode a three-byte UTF-8 sequence
---~ local function f3 (s)
---~   local c1, c2, c3 = string.byte(s, 1, 3)
---~   return (c1 * 64 + c2) * 64 + c3 - 925824
---~ end
---~
---~ -- decode a four-byte UTF-8 sequence
---~ local function f4 (s)
---~   local c1, c2, c3, c4 = string.byte(s, 1, 4)
---~   return ((c1 * 64 + c2) * 64 + c3) * 64 + c4 - 63447168
---~ end
---~
---~ local cont = lpeg.R("\128\191")   -- continuation byte
---~
---~ local utf8 = lpeg.R("\0\127") / string.byte
---~            + lpeg.R("\194\223") * cont / f2
---~            + lpeg.R("\224\239") * cont * cont / f3
---~            + lpeg.R("\240\244") * cont * cont * cont / f4
---~
---~ local decode_pattern = lpeg.Ct(utf8^0) * -1
-
 
-local cont = R("\128\191")   -- continuation byte
+local f1 = string.byte
 
-lpeg.utf8 = R("\0\127") + R("\194\223") * cont + R("\224\239") * cont * cont + R("\240\244") * cont * cont * cont
+local function f2(s) local c1, c2         = f1(s,1,2) return   c1 * 64 + c2                       -    12416 end
+local function f3(s) local c1, c2, c3     = f1(s,1,3) return  (c1 * 64 + c2) * 64 + c3            -   925824 end
+local function f4(s) local c1, c2, c3, c4 = f1(s,1,4) return ((c1 * 64 + c2) * 64 + c3) * 64 + c4 - 63447168 end
 
+patterns.utf8byte = patterns.utf8one/f1 + patterns.utf8two/f2 + patterns.utf8three/f3 + patterns.utf8four/f4
diff --git a/luaextra-os.lua b/luaextra-os.lua
index b60dfb7..4f0c0c1 100644
--- a/luaextra-os.lua
+++ b/luaextra-os.lua
@@ -8,7 +8,7 @@ if not modules then modules = { } end modules ['l-os'] = {
 
 -- maybe build io.flush in os.execute
 
-local find, format = string.find, string.format
+local find, format, gsub = string.find, string.format, string.gsub
 local random, ceil = math.random, math.ceil
 
 local execute, spawn, exec, ioflush = os.execute, os.spawn or os.execute, os.exec or os.execute, io.flush
@@ -43,6 +43,12 @@ end
 os.type = os.type or (io.pathseparator == ";"       and "windows") or "unix"
 os.name = os.name or (os.type          == "windows" and "mswin"  ) or "linux"
 
+if os.type == "windows" then
+    os.libsuffix, os.binsuffix = 'dll', 'exe'
+else
+    os.libsuffix, os.binsuffix = 'so', ''
+end
+
 function os.launch(str)
     if os.type == "windows" then
         os.execute("start " .. str) -- os.spawn ?
@@ -51,10 +57,6 @@ function os.launch(str)
     end
 end
 
-if not os.setenv then
-    function os.setenv() return false end
-end
-
 if not os.times then
     -- utime  = user time
     -- stime  = system time
@@ -86,63 +88,182 @@ end
 
 -- no need for function anymore as we have more clever code and helpers now
 
-os.platform  = os.name or os.type or "linux"
-os.libsuffix = 'so'
-os.binsuffix = ''
+os.resolvers = os.resolvers or { }
 
-local name = os.name
+local resolvers = os.resolvers
 
-if name == "windows" or name == "mswin" or name == "win32" or name == "msdos" or os.type == "windows" then
-    if os.getenv("PROCESSOR_ARCHITECTURE") == "AMD64" then
-        os.platform = "mswin-64"
-    else
-        os.platform = "mswin"
+local osmt = getmetatable(os) or { __index = function(t,k) t[k] = "unset" return "unset" end }
+local osix = osmt.__index
+
+osmt.__index = function(t,k)
+    return (resolvers[k] or osix)(t,k)
+end
+
+setmetatable(os,osmt)
+
+if not os.setenv then
+
+    -- we still store them but they won't be seen in
+    -- child processes although we might pass them some day
+    -- using command concatination
+
+    local env, getenv = { }, os.getenv
+
+    function os.setenv(k,v)
+        env[k] = v
     end
-    os.libsuffix = 'dll'
-    os.binsuffix = 'exe'
-else
-    local architecture = os.getenv("HOSTTYPE") or ""
-    if architecture == "" then
-        architecture = os.resultof("uname -m") or ""
+
+    function os.getenv(k)
+        return env[k] or getenv(k)
     end
-    if architecture == "" then
-        local architecture = os.resultof("echo $HOSTTYPE")
+
+end
+
+-- we can use HOSTTYPE on some platforms
+
+local name, platform = os.name or "linux", os.getenv("MTX_PLATFORM") or ""
+
+local function guess()
+    local architecture = os.resultof("uname -m") or ""
+    if architecture ~= "" then
+        return architecture
+    end
+    architecture = os.getenv("HOSTTYPE") or ""
+    if architecture ~= "" then
+        return architecture
+    end
+    return os.resultof("echo $HOSTTYPE") or ""
+end
+
+if platform ~= "" then
+
+    os.platform = platform
+
+elseif os.type == "windows" then
+
+    -- we could set the variable directly, no function needed here
+
+    function os.resolvers.platform(t,k)
+        local platform, architecture = "", os.getenv("PROCESSOR_ARCHITECTURE") or ""
+        if find(architecture,"AMD64") then
+            platform = "mswin-64"
+        else
+            platform = "mswin"
+        end
+        os.setenv("MTX_PLATFORM",platform)
+        os.platform = platform
+        return platform
     end
-    if name == "linux" then
+
+elseif name == "linux" then
+
+    function os.resolvers.platform(t,k)
+        -- we sometims have HOSTTYPE set so let's check that first
+        local platform, architecture = "", os.getenv("HOSTTYPE") or os.resultof("uname -m") or ""
         if find(architecture,"x86_64") then
-            os.platform = "linux-64"
+            platform = "linux-64"
         elseif find(architecture,"ppc") then
-            os.platform = "linux-ppc"
+            platform = "linux-ppc"
         else
-            os.platform = "linux"
+            platform = "linux"
         end
-    elseif name == "macosx" then
-        if find(architecture,"i386") then
-            os.platform = "osx-intel"
+        os.setenv("MTX_PLATFORM",platform)
+        os.platform = platform
+        return platform
+    end
+
+elseif name == "macosx" then
+
+    --[[
+        Identifying the architecture of OSX is quite a mess and this
+        is the best we can come up with. For some reason $HOSTTYPE is
+        a kind of pseudo environment variable, not known to the current
+        environment. And yes, uname cannot be trusted either, so there
+        is a change that you end up with a 32 bit run on a 64 bit system.
+        Also, some proper 64 bit intel macs are too cheap (low-end) and
+        therefore not permitted to run the 64 bit kernel.
+      ]]--
+
+    function os.resolvers.platform(t,k)
+     -- local platform, architecture = "", os.getenv("HOSTTYPE") or ""
+     -- if architecture == "" then
+     --     architecture = os.resultof("echo $HOSTTYPE") or ""
+     -- end
+        local platform, architecture = "", os.resultof("echo $HOSTTYPE") or ""
+        if architecture == "" then
+         -- print("\nI have no clue what kind of OSX you're running so let's assume an 32 bit intel.\n")
+            platform = "osx-intel"
+        elseif find(architecture,"i386") then
+            platform = "osx-intel"
         elseif find(architecture,"x86_64") then
-            os.platform = "osx-64"
+            platform = "osx-64"
         else
-            os.platform = "osx-ppc"
+            platform = "osx-ppc"
         end
-    elseif name == "sunos" then
+        os.setenv("MTX_PLATFORM",platform)
+        os.platform = platform
+        return platform
+    end
+
+elseif name == "sunos" then
+
+    function os.resolvers.platform(t,k)
+        local platform, architecture = "", os.resultof("uname -m") or ""
         if find(architecture,"sparc") then
-            os.platform = "solaris-sparc"
+            platform = "solaris-sparc"
         else -- if architecture == 'i86pc'
-            os.platform = "solaris-intel"
+            platform = "solaris-intel"
         end
-    elseif name == "freebsd" then
+        os.setenv("MTX_PLATFORM",platform)
+        os.platform = platform
+        return platform
+    end
+
+elseif name == "freebsd" then
+
+    function os.resolvers.platform(t,k)
+        local platform, architecture = "", os.resultof("uname -m") or ""
         if find(architecture,"amd64") then
-            os.platform = "freebsd-amd64"
+            platform = "freebsd-amd64"
         else
-            os.platform = "freebsd"
+            platform = "freebsd"
         end
-    else
-        os.platform = 'linux'
+        os.setenv("MTX_PLATFORM",platform)
+        os.platform = platform
+        return platform
     end
+
+elseif name == "kfreebsd" then
+
+    function os.resolvers.platform(t,k)
+        -- we sometims have HOSTTYPE set so let's check that first
+        local platform, architecture = "", os.getenv("HOSTTYPE") or os.resultof("uname -m") or ""
+        if find(architecture,"x86_64") then
+            platform = "kfreebsd-64"
+        else
+            platform = "kfreebsd-i386"
+        end
+        os.setenv("MTX_PLATFORM",platform)
+        os.platform = platform
+        return platform
+    end
+
+else
+
+    -- platform = "linux"
+    -- os.setenv("MTX_PLATFORM",platform)
+    -- os.platform = platform
+
+    function os.resolvers.platform(t,k)
+        local platform = "linux"
+        os.setenv("MTX_PLATFORM",platform)
+        os.platform = platform
+        return platform
+    end
+
 end
 
 -- beware, we set the randomseed
---
 
 -- from wikipedia: Version 4 UUIDs use a scheme relying only on random numbers. This algorithm sets the
 -- version number as well as two reserved bits. All other bits are set using a random or pseudorandom
@@ -151,7 +272,6 @@ end
 --
 -- as we don't call this function too often there is not so much risk on repetition
 
-
 local t = { 8, 9, "a", "b" }
 
 function os.uuid()
@@ -163,3 +283,18 @@ function os.uuid()
         random(0xFFFF),random(0xFFFF),random(0xFFFF)
     )
 end
+
+local d
+
+function os.timezone(delta)
+    d = d or tonumber(tonumber(os.date("%H")-os.date("!%H")))
+    if delta then
+        if d > 0 then
+            return format("+%02i:00",d)
+        else
+            return format("-%02i:00",-d)
+        end
+    else
+        return 1
+    end
+end
diff --git a/luaextra-table.lua b/luaextra-table.lua
index 70a901e..e8f72ed 100644
--- a/luaextra-table.lua
+++ b/luaextra-table.lua
@@ -12,6 +12,7 @@ local concat, sort, insert, remove = table.concat, table.sort, table.insert, tab
 local format, find, gsub, lower, dump, match = string.format, string.find, string.gsub, string.lower, string.dump, string.match
 local getmetatable, setmetatable = getmetatable, setmetatable
 local type, next, tostring, tonumber, ipairs, pairs = type, next, tostring, tonumber, ipairs, pairs
+local unpack = unpack or table.unpack
 
 function table.strip(tab)
     local lst = { }
@@ -28,7 +29,7 @@ end
 
 function table.keys(t)
     local k = { }
-    for key,_ in next, t do
+    for key, _ in next, t do
         k[#k+1] = key
     end
     return k
diff --git a/luaextra-url.lua b/luaextra-url.lua
index 1d282a1..e3e6f81 100644
--- a/luaextra-url.lua
+++ b/luaextra-url.lua
@@ -32,7 +32,9 @@ local hexdigit  = lpeg.R("09","AF","af")
 local plus      = lpeg.P("+")
 local escaped   = (plus / " ") + (percent * lpeg.C(hexdigit * hexdigit) / tochar)
 
-local scheme    =                 lpeg.Cs((escaped+(1-colon-slash-qmark-hash))^0) * colon + lpeg.Cc("")
+-- we assume schemes with more than 1 character (in order to avoid problems with windows disks)
+
+local scheme    =                 lpeg.Cs((escaped+(1-colon-slash-qmark-hash))^2) * colon + lpeg.Cc("")
 local authority = slash * slash * lpeg.Cs((escaped+(1-      slash-qmark-hash))^0)         + lpeg.Cc("")
 local path      = slash *         lpeg.Cs((escaped+(1-            qmark-hash))^0)         + lpeg.Cc("")
 local query     = qmark         * lpeg.Cs((escaped+(1-                  hash))^0)         + lpeg.Cc("")
@@ -40,22 +42,48 @@ local fragment  = hash          * lpeg.Cs((escaped+(1-           endofstring))^0
 
 local parser = lpeg.Ct(scheme * authority * path * query * fragment)
 
+-- todo: reconsider Ct as we can as well have five return values (saves a table)
+-- so we can have two parsers, one with and one without
+
 function url.split(str)
     return (type(str) == "string" and lpegmatch(parser,str)) or str
 end
 
+-- todo: cache them
+
 function url.hashed(str)
     local s = url.split(str)
+    local somescheme = s[1] ~= ""
     return {
-        scheme = (s[1] ~= "" and s[1]) or "file",
+        scheme    = (somescheme and s[1]) or "file",
         authority = s[2],
-        path = s[3],
-        query = s[4],
-        fragment = s[5],
-        original = str
+        path      = s[3],
+        query     = s[4],
+        fragment  = s[5],
+        original  = str,
+        noscheme  = not somescheme,
     }
 end
 
+function url.hasscheme(str)
+    return url.split(str)[1] ~= ""
+end
+
+function url.addscheme(str,scheme)
+    return (url.hasscheme(str) and str) or ((scheme or "file:///") .. str)
+end
+
+function url.construct(hash)
+    local fullurl = hash.sheme .. "://".. hash.authority .. hash.path
+    if hash.query then
+        fullurl = fullurl .. "?".. hash.query
+    end
+    if hash.fragment then
+        fullurl = fullurl .. "?".. hash.fragment
+    end
+    return fullurl
+end
+
 function url.filename(filename)
     local t = url.hashed(filename)
     return (t.scheme == "file" and (gsub(t.path,"^/([a-zA-Z])([:|])/)","%1:"))) or filename