eclass/lua-utils-alt.eclass

   1 # Copyright 1999-2020 Gentoo Foundation
   2 # Distributed under the terms of the GNU General Public License v2
   3
   4 # @ECLASS: lua-utils-alt.eclass
   5 # @MAINTAINER:
   6 # ???????
   7 # @AUTHOR:
   8 # S. Gilles <sgilles@math.umd.edu>
   9 # Based on work of: Michał Górny <mgorny@gentoo.org>
  10 # Based on work of: Krzysztof Pawlik <nelchael@gentoo.org>
  11 # @SUPPORTED_EAPIS: 6 7
  12 # @BLURB: Utility functions for packages with Lua parts.
  13 # @DESCRIPTION:
  14 # A utility class providing functions to query Lua implementations
  15 #
  16 # This eclass does not export any phase functions.
  17 #
  18 # This eclass sets correct IUSE. Modification of REQUIRED_USE has
  19 # to be done by the author of the ebuild.
  20
  21 case "${EAPI:-0}" in
  22         0|1|2|3|4|5)
  23                 die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
  24                 ;;
  25         6|7)
  26                 ;;
  27         *)
  28                 die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
  29                 ;;
  30 esac
  31
  32
  33 inherit multibuild
  34 inherit toolchain-funcs
  35
  36 # @ECLASS-VARIABLE: LUA_COMPAT
  37 # @REQUIRED
  38 # @DESCRIPTION:
  39 # This variable contains a list of Lua implementations the package
  40 # supports. It must be set before the `inherit' call. It has to be
  41 # an array.
  42 #
  43 # Example:
  44 # @CODE
  45 # LUA_COMPAT=( lua5_4 lua5_3 luajit2 )
  46 # @CODE
  47
  48 # @ECLASS-VARIABLE: _LUA_ALL_IMPLS
  49 # @INTERNAL
  50 # @DESCRIPTION:
  51 # All supported Lua implementations
  52 _LUA_ALL_IMPLS=( luajit2 lua5_1 lua5_2 lua5_3 lua5_4 )
  53 readonly _LUA_ALL_IMPLS
  54
  55 # @FUNCTION _lua_package_from_target
  56 # @INTERNAL
  57 # @DESCRIPTION:
  58 # Given "lua5_3", return "dev-lang/lua:5.3" or such
  59 _lua_package_from_target() {
  60         [ "$1" == "lua5_4" ] && echo "dev-lang/lua:5.4"
  61         [ "$1" == "lua5_3" ] && echo "dev-lang/lua:5.3"
  62         [ "$1" == "lua5_2" ] && echo "dev-lang/lua:5.2"
  63         [ "$1" == "lua5_1" ] && echo "dev-lang/lua:5.1"
  64         [ "$1" == "luajit2" ] && echo "dev-lang/luajit:2"
  65 }
  66
  67 # @FUNCTION: _lua_pkgconfig_from_target
  68 # @INTERNAL
  69 # DESCRIPTION:
  70 # Given a name from LUA_COMPAT, return the appropriate name for pkg-config
  71 _lua_pkgconfig_from_target() {
  72         [ "$1" == "lua5_4" ] && echo "lua5.4"
  73         [ "$1" == "lua5_3" ] && echo "lua5.3"
  74         [ "$1" == "lua5_2" ] && echo "lua5.2"
  75         [ "$1" == "lua5_1" ] && echo "lua5.1"
  76         [ "$1" == "luajit2" ] && echo "luajit"
  77 }
  78
  79 # @FUNCTION: _lua_set_impls
  80 # @INTERNAL
  81 # @DESCRIPTION:
  82 #  Check LUA_COMPAT for well-formedness and validity, then set
  83 #  _LUA_IMPLS to be the intersection of LUA_COMPAT and _LUA_ALL_IMPLS.
  84 #  Also set IUSE.
  85 _lua_set_globals() {
  86         debug-print-function ${FUNCNAME} "${@}"
  87         local deps i
  88
  89         if ! declare -p LUA_COMPAT &>/dev/null; then
  90                 die 'LUA_COMPAT not declared.'
  91         fi
  92         if [[ $(declare -p LUA_COMPAT) != "declare -a"* ]]; then
  93                 die 'LUA_COMPAT must be an array.'
  94         fi
  95
  96         _LUA_IMPLS=()
  97
  98         for i in "${_LUA_ALL_IMPLS[@]}"; do
  99                 if has "${i}" "${LUA_COMPAT[@]}"; then
 100                         _LUA_IMPLS+=( "${i}" )
 101                 fi
 102         done
 103
 104         if [[ ! ${_LUA_IMPLS[@]} ]]; then
 105                 die "No supported implementation in LUA_COMPAT."
 106         fi
 107
 108         for i in "${_LUA_IMPLS[@]}"; do
 109                 deps+="lua_targets_${i}? ( $(_lua_package_from_target ${i}) ) "
 110         done
 111
 112         local flags=( "${_LUA_ALL_IMPLS[@]/#/lua_targets_}" )
 113         local requse="|| ( ${flags[*]} )"
 114
 115         local f=( )
 116         for (( i = ${#_LUA_ALL_IMPLS[@]} - 1; i >= 0; i-- )); do
 117                 f+=( "lua_targets_${_LUA_ALL_IMPLS[i]}" )
 118         done
 119         IUSE=${f[*]}
 120
 121         LUA_DEPS=${deps}
 122         LUA_REQUIRED_USE=${requse}
 123         readonly LUA_DEPS LUA_REQUIRED_USE
 124 }
 125 _lua_set_globals
 126 unset -f _lua_set_globals