Re: DSL in lua

[steve donovan <steve.j.donovan@...>]

On Thu, Dec 6, 2012 at 7:52 AM, Vasiliy Tolstov <v.tolstov@selfip.ru> wrote:
> directory "/etc/" {
>   owner "root";
>   group "wheel";
>   mode "0755";
>   action "create";
> }

Here is how to make this valid Lua:

0) use semicolons or commas as delimiters (my edit!)
1) directory is a function that takes a path string and returns a function
2) which takes a table argument
3) owner, group, etc are functions that take strings.

(Because of Lua call syntax sugar, we can leave out parens when there
is a single argument which is a string literal or a table constructor)

Alternative to 3), set table keys (since presumably order is not
important here?)

directory "/etc/" {
  owner="root";
  group="wheel";
  mode="0755";
  action="create";
 }

If you don't want delimiters, the code can be converted into valid Lua
by a suitable string transformation, e.g a simple-minded replacement
of strings at end-of-line with the string plus semi-colon.

When executing such configuration Lua, run it in your own environment
that will contain the directory, etc functions and have no references
to dangerous global functions

steve d.