feat: Rework Lua version and path macros using RPM Lua blocks

The `%lua_version`, `%lua_version_nodots`, and `%lua_noarchdir`
macros have been refactored to use the RPM internal Lua
interpreter blocks (`%{lua:...}`) instead of relying solely on
shell command execution (`%()`).

This change offers several benefits:
1. Consistency: Standardizes the approach, as other macros like
   `%lua_version_default` already use RPM Lua blocks.
2. Robustness: Improves path handling by explicitly trimming
   whitespace/newlines from the `pkgconf` output in
   `%lua_noarchdir`.
3. Clarity: Simplifies the logic for extracting the version
   number and calculating the no-dots version.

The `%lua_noarchdir` logic was also improved to correctly handle
a failure of the `pkgconf` command (e.g., when the package isn't
installed) by checking for `f == nil`.

A comment was also added to `%lua_provides` to clarify the
required definition of `%mod_name`.

lua-macros.changes

@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sat Oct 11 16:45:06 UTC 2025 - Matej Cepl <mcepl@cepl.eu>
+
+- Rework Lua version and path macros using RPM Lua blocks.
+
 -------------------------------------------------------------------
 Fri Oct 10 10:56:01 UTC 2025 - Matej Cepl <mcepl@cepl.eu>
 

macros.lua

@@ -1,23 +1,40 @@
 # RPM macros for Lua
 
 # The major.minor version of Lua
-%lua_version %(lua -e 'print(_VERSION)' | cut -d ' ' -f 2)
-%lua_version_nodots %(lua -e 'print((string.gsub("%{lua_version}", "%.", "")))')
+%lua_version %{lua:
+local f = io.popen("lua -e 'print(_VERSION)'")
+local output = f:read("*a")
+f:close()
+local ver = output:match("Lua (%d%.%d)")
+print(ver)
+}
+%lua_version_nodots %{lua:
+  local ver = rpm.expand("%{lua_version}")
+  local nodots = ver:gsub("%.", "")
+  print(nodots)
+}
 
 # compiled modules should go here
 %lua_archdir %(pkgconf --variable=INSTALL_CMOD lua)
 
 # pure Lua modules should go here
+%lua_noarchdir %{lua:
+local output = ""
 local f = io.popen("pkgconf --variable=INSTALL_LMOD lua")
-local output = f:read("*a")
-f:close()
 
-if output:len() == 0 then
-%lua_noarchdir %{_datadir}/lua/%{lua_version}/luacheck/
-else
-%lua_noarchdir %(pkgconf --variable=INSTALL_LMOD lua)
+if f ~= nil then
+    output = f:read("*a"):gsub("^%s*(.-)%s*$", "%1")
+    f:close()
 end
 
+if output:len() > 0 then
+    print(output)
+    return
+end
+
+print(rpm.expand("%{_datadir}/lua/%{lua_version}"))
+}
+
 # lua includes folder
 %lua_incdir %(pkgconf --variable=includedir lua)
 
@@ -41,6 +58,7 @@ print(result)
 %{nil}
 
 # Lua default version
+# This REQUIRES macro %{mod_name} to be defined.
 # -e: Exclude lua prefix
 # -n: Specify name
 %lua_provides(en:) \