[Rpm-maint] [rpm-software-management/rpm] Allow to call lua functions from the expresion parser (PR #1834)

[Michael Schroeder]

Lua functions start with a "lua:" prefix. The result of the function call is always stringified, nil is translated to the empty string.

You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1834

-- Commit Summary --

  * Add support for functions to the expression parser
  * Refactor arg handling in rpmluaHook
  * Add rpmluaCallStringFunction() allowing to call a generic lua function
  * Allow to call lua functions from the expresion parser

-- File Changes --

    M rpmio/expression.c (118)
    M rpmio/rpmlua.c (187)
    M rpmio/rpmlua.h (3)
    M tests/rpmmacro.at (11)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1834.patch
https://github.com/rpm-software-management/rpm/pull/1834.diff

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