[Rpm-maint] [rpm-software-management/rpm] Add shorthand macros for some conventient Lua string operations (PR #2181)

[Panu Matilainen]

Despite all the Lua magic we already do, it's annoyingly often the case that shelling out is easier (or at least shorter) than doing the same in Lua (substrings, length etc)

Add shorthand macros %gsub, %len, %lower, %rep, %reverse, %sub and %upper which simply wrap the corresponding Lua string.* functions for convenience.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/2181

-- Commit Summary --

  * Add shorthand macros for some conventient Lua string operations

-- File Changes --

    M docs/manual/macros.md (9)
    M rpmio/macro.c (23)
    M tests/rpmmacro.at (29)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/2181.patch
https://github.com/rpm-software-management/rpm/pull/2181.diff

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