diff -r 3975fa5ed630 -r b2df1b3f2c83 luaext.lua
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/luaext.lua	Sun Sep 13 22:22:47 2009 +0300
@@ -0,0 +1,96 @@
+--
+-- ion/share/ioncore_luaext.lua
+-- 
+-- Copyright (c) Tuomo Valkonen 2004-2009.
+--
+-- See the included file LICENSE for details.
+--
+
+
+--DOC
+-- Make \var{str} shell-safe.
+function string.shell_safe(str)
+    return "'"..string.gsub(str, "'", "'\\''").."'"
+end
+
+
+--DOC
+-- Make copy of \var{table}. If \var{deep} is unset, shallow one-level
+-- copy is made, otherwise a deep copy is made.
+function table.copy(t, deep)
+    local function docopy(t, deep, seen)
+        local nt={}
+        for k, v in pairs(t) do
+            local v2=v
+            if deep and type(v)=="table" then
+                if seen[v] then
+                    error(TR("Recursive table - unable to deepcopy"))
+                end
+                seen[v]=true
+                v2=docopy(v, deep, seen)
+                seen[v]=nil
+            end
+            nt[k]=v2
+        end
+        return nt
+    end
+    return docopy(t, deep, deep and {})
+end
+
+
+--DOC
+-- Add entries that do not exist in \var{t1} from \var{t2} to \var{t1}.
+function table.append(t1, t2)
+    for k, v in pairs(t2) do
+        if t1[k]==nil then
+            t1[k]=v
+        end
+    end
+    return t1
+end
+
+
+--DOC
+-- Create a table containing all entries from \var{t1} and those from
+-- \var{t2} that are missing from \var{t1}.
+function table.join(t1, t2)
+    return table.append(table.copy(t1, false), t2)
+end
+
+
+--DOC
+-- Insert all positive integer entries from t2 into t1.
+function table.icat(t1, t2)
+    for _, v in ipairs(t2) do
+        table.insert(t1, v)
+    end
+    return t1
+end
+
+
+--DOC
+-- Map all entries of \var{t} by \var{f}.
+function table.map(f, t)
+    local res={}
+    for k, v in pairs(t) do
+        res[k]=f(v)
+    end
+    return res
+end
+
+
+--DOC
+-- Export a list of functions from \var{lib} into global namespace.
+function export(lib, ...)
+    for k, v in pairs({...}) do
+        _G[v]=lib[v]
+    end
+end
+
+function io.openX(file, ...)
+    local f, err = io.open(file, ...)
+    if not f then
+        error(file..": "..err)
+    end
+    return f
+end