update l-md5

1 files changed, 25 insertions, 11 deletions

diff --git a/lualibs-md5.lua b/lualibs-md5.lua
index 27955ef..6abf2e1 100644
--- a/lualibs-md5.lua
+++ b/lualibs-md5.lua
@@ -7,6 +7,7 @@ if not modules then modules = { } end modules ['l-md5'] = {
 
 -- This also provides file checksums and checkers.
 
+local md5, file = md5, file
 local gsub, format, byte = string.gsub, string.format, string.byte
 
 local function convert(str,fmt)
@@ -30,17 +31,30 @@ if not md5.dec then function md5.dec(str) return convert(str,"%03i") end end
 --~     function md5.dec(str) return (gsub(md5.sum(str),".",remap)) end
 --~ end
 
-file.needs_updating_threshold = 1
-
-function file.needs_updating(oldname,newname) -- size modification access change
-    local oldtime = lfs.attributes(oldname, modification)
-    local newtime = lfs.attributes(newname, modification)
-    if newtime >= oldtime then
-        return false
-    elseif oldtime - newtime < file.needs_updating_threshold then
-        return false
+function file.needsupdating(oldname,newname,threshold) -- size modification access change
+    local oldtime = lfs.attributes(oldname,"modification")
+    if oldtime then
+        local newtime = lfs.attributes(newname,"modification")
+        if not newtime then
+            return true -- no new file, so no updating needed
+        elseif newtime >= oldtime then
+            return false -- new file definitely needs updating
+        elseif oldtime - newtime < (threshold or 1) then
+            return false -- new file is probably still okay
+        else
+            return true -- new file has to be updated
+        end
     else
-        return true
+        return false -- no old file, so no updating needed
+    end
+end
+
+file.needs_updating = file.needsupdating
+
+function file.syncmtimes(oldname,newname)
+    local oldtime = lfs.attributes(oldname,"modification")
+    if oldtime and lfs.isfile(newname) then
+        lfs.touch(newname,oldtime,oldtime)
     end
 end
 
@@ -62,7 +76,7 @@ function file.loadchecksum(name)
     return nil
 end
 
-function file.savechecksum(name, checksum)
+function file.savechecksum(name,checksum)
     if not checksum then checksum = file.checksum(name) end
     if checksum then
         io.savedata(name .. ".md5",checksum)