[Rpm-maint] [rpm-software-management/rpm] Introduce convenient %gsub macro to wrap Lua's string.gsub() (#1764)

[Miro Hrončok]

> Regarding making lua functions easier to access: it would not be hard to add function support to the expression parser:
> 
> ```
> %[lua:gsub("aaa", "a", "b", 2)]
> ```
> 
> Just a thought...

Since `gsub()` is a method of string, would this expose string methods only, or would the actual call need to be `%[lua:string.gsub("aaa", "a", "b", 2)]`?

And considering I need to apply this method on macro value, would I need to do `%[lua:string.gsub(macros.foo, "a", "b", 2)]`? That is not such a big improvement over `%{lua:print((string.gsub(macros.foo, "a", "b", 2)))}`.



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