feat(completion): add native zsh completion support

dnf5.spec

@@ -319,6 +319,9 @@ It supports RPM packages, modulemd modules, and comps groups & environments.
 %dir %{_datadir}/bash-completion/
 %dir %{_datadir}/bash-completion/completions/
 %{_datadir}/bash-completion/completions/dnf*
+%dir %{_datadir}/zsh/
+%dir %{_datadir}/zsh/site-functions/
+%{_datadir}/zsh/site-functions/_dnf5
 %license COPYING.md
 %license gpl-2.0.txt
 %doc AUTHORS.md CHANGELOG.md CONTRIBUTING.md README.md

dnf5/CMakeLists.txt

@@ -61,12 +61,16 @@ else()
   message (STATUS "Using fallback bash completion dir ${BASH_COMPLETION_COMPLETIONSDIR}")
 endif()
 
+set(ZSH_COMPLETION_COMPLETIONSDIR "${CMAKE_INSTALL_PREFIX}/share/zsh/site-functions")
+message(STATUS "Using zsh completion dir ${ZSH_COMPLETION_COMPLETIONSDIR}")
+
 find_package(toml11 REQUIRED)
 if (toml11_VERSION VERSION_LESS 4.0.0)
     add_definitions(-DTOML11_COMPAT)
 endif()
 
 install(FILES bash-completion/dnf5 DESTINATION ${BASH_COMPLETION_COMPLETIONSDIR})
+install(FILES zsh-completion/_dnf5 DESTINATION ${ZSH_COMPLETION_COMPLETIONSDIR})
 install(FILES "README.plugins" DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}/dnf5/plugins" RENAME "README")
 install(DIRECTORY "config/usr/" DESTINATION "${CMAKE_INSTALL_PREFIX}" PATTERN ".gitkeep" EXCLUDE)
 install(DIRECTORY "config/etc/" DESTINATION "${CMAKE_INSTALL_FULL_SYSCONFDIR}" PATTERN ".gitkeep" EXCLUDE)

dnf5/zsh-completion/_dnf5

@@ -0,0 +1,9 @@
+#compdef dnf5 dnf
+
+_dnf5() {
+    local -a completions
+    completions=("${(@f)$(dnf5 --complete=$((CURRENT-1)) "${words[@]}" 2>/dev/null)}")
+    compadd -a completions
+}
+
+_dnf5 "$@"