Initial prototype for Lua plugins

plugins/uncompress.lua

@@ -0,0 +1,21 @@
+function tempdir()
+    local stream = assert(io.popen('mktemp --directory'))
+    local output = stream:read('*all')
+    stream:close()
+    return string.gsub(output, "\n", "")
+end
+
+function preprocess(path)
+    prefix = string.match(path, '^(.*)%.gz$')
+    if prefix then
+        local temp_directory = tempdir()
+        local new_path = temp_directory .. "/" .. prefix
+
+        -- TODO: how to prevent shell injection bugs?
+        os.execute("gunzip < '" .. path .. "' > '" .. new_path .. "'")
+
+        return new_path
+    else
+        return path
+    end
+end