# Copyright 1999-2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: elisp.eclass
# @MAINTAINER:
# Gentoo GNU Emacs project <gnu-emacs@gentoo.org>
# @AUTHOR:
# Matthew Kennedy <mkennedy@gentoo.org>
# Jeremy Maitin-Shepard <jbms@attbi.com>
# Christian Faulhammer <fauli@gentoo.org>
# Ulrich Müller <ulm@gentoo.org>
# @BLURB: Eclass for Emacs Lisp packages
# @DESCRIPTION:
#
# This eclass is designed to install elisp files of Emacs related
# packages into the site-lisp directory.  The majority of elisp packages
# will only need to define the standard ebuild variables (like SRC_URI)
# and optionally SITEFILE for successful installation.
#
# Emacs support for other than pure elisp packages is handled by
# elisp-common.eclass where you won't have a dependency on Emacs itself.
# All elisp-* functions are documented there.
#
# If the package's source is a single (in whatever way) compressed elisp
# file with the file name ${P}.el, then this eclass will move ${P}.el to
# ${PN}.el in src_unpack().

# @ECLASS-VARIABLE: NEED_EMACS
# @DEFAULT_UNSET
# @DESCRIPTION:
# If you need anything different from Emacs 23, use the NEED_EMACS
# variable before inheriting elisp.eclass.  Set it to the major version
# your package uses and the dependency will be adjusted.

# @ECLASS-VARIABLE: ELISP_PATCHES
# @DEFAULT_UNSET
# @DESCRIPTION:
# Space separated list of patches to apply after unpacking the sources.
# Patch files are searched for in the current working dir, WORKDIR, and
# FILESDIR.

# @ECLASS-VARIABLE: ELISP_REMOVE
# @DEFAULT_UNSET
# @DESCRIPTION:
# Space separated list of files to remove after unpacking the sources.

# @ECLASS-VARIABLE: SITEFILE
# @DEFAULT_UNSET
# @DESCRIPTION:
# Name of package's site-init file.  The filename must match the shell
# pattern "[1-8][0-9]*-gentoo.el"; numbers below 10 and above 89 are
# reserved for internal use.  "50${PN}-gentoo.el" is a reasonable choice
# in most cases.

# @ECLASS-VARIABLE: ELISP_TEXINFO
# @DEFAULT_UNSET
# @DESCRIPTION:
# Space separated list of Texinfo sources.  Respective GNU Info files
# will be generated in src_compile() and installed in src_install().

# @ECLASS-VARIABLE: DOCS
# @DEFAULT_UNSET
# @DESCRIPTION:
# DOCS="blah.txt ChangeLog" is automatically used to install the given
# files by dodoc in src_install().

inherit elisp-common
case ${EAPI:-0} in
	0|1|2|3|4|5) inherit epatch ;;
	6|7) ;;
	*) die "${ECLASS}: EAPI ${EAPI} not supported" ;;
esac

case ${EAPI:-0} in
	0|1) EXPORT_FUNCTIONS src_{unpack,compile,install} \
			pkg_{setup,postinst,postrm} ;;
	*) EXPORT_FUNCTIONS src_{unpack,prepare,configure,compile,install} \
			pkg_{setup,postinst,postrm} ;;
esac

RDEPEND=">=virtual/emacs-${NEED_EMACS:-23}"
case ${EAPI:-0} in
	0|1|2|3|4|5|6) DEPEND="${RDEPEND}" ;;
	*) BDEPEND="${RDEPEND}" ;;
esac

# @FUNCTION: elisp_pkg_setup
# @DESCRIPTION:
# Test if the eselected Emacs version is sufficient to fulfil the major
# version requirement of the NEED_EMACS variable.

elisp_pkg_setup() {
	elisp-need-emacs "${NEED_EMACS:-23}"
	case $? in
		0) ;;
		1) die "Emacs version too low" ;;
		*) die "Could not determine Emacs version" ;;
	esac
}

# @FUNCTION: elisp_src_unpack
# @DESCRIPTION:
# Unpack the sources; also handle the case of a single *.el file in
# WORKDIR for packages distributed that way.  For EAPIs without
# src_prepare, call elisp_src_prepare.

elisp_src_unpack() {
	[[ -n ${A} ]] && unpack ${A}
	if [[ -f ${P}.el ]]; then
		# the "simple elisp" case with a single *.el file in WORKDIR
		mv ${P}.el ${PN}.el || die
		[[ -d ${S} ]] || S=${WORKDIR}
	fi

	case ${EAPI:-0} in
		0|1) [[ -d ${S} ]] && cd "${S}"
			elisp_src_prepare ;;
	esac
}

# @FUNCTION: elisp_src_prepare
# @DESCRIPTION:
# Apply any patches listed in ELISP_PATCHES.  Patch files are searched
# for in the current working dir, WORKDIR, and FILESDIR.

elisp_src_prepare() {
	local patch file
	for patch in ${ELISP_PATCHES}; do
		if [[ -f ${patch} ]]; then
			file="${patch}"
		elif [[ -f ${WORKDIR}/${patch} ]]; then
			file="${WORKDIR}/${patch}"
		elif [[ -f ${FILESDIR}/${patch} ]]; then
			file="${FILESDIR}/${patch}"
		else
			die "Cannot find ${patch}"
		fi
		case ${EAPI:-0} in
			0|1|2|3|4|5) epatch "${file}" ;;
			*) eapply "${file}" ;;
		esac
	done

	# apply any user patches
	case ${EAPI:-0} in
		0|1|2|3|4|5) epatch_user ;;
		*) eapply_user ;;
	esac

	if [[ -n ${ELISP_REMOVE} ]]; then
		rm ${ELISP_REMOVE} || die
	fi
}

# @FUNCTION: elisp_src_configure
# @DESCRIPTION:
# Do nothing, because Emacs packages seldomly bring a full build system.

elisp_src_configure() { :; }

# @FUNCTION: elisp_src_compile
# @DESCRIPTION:
# Call elisp-compile to byte-compile all Emacs Lisp (*.el) files.
# If ELISP_TEXINFO lists any Texinfo sources, call makeinfo to generate
# GNU Info files from them.

elisp_src_compile() {
	elisp-compile *.el
	if [[ -n ${ELISP_TEXINFO} ]]; then
		makeinfo ${ELISP_TEXINFO} || die
	fi
}

# @FUNCTION: elisp_src_install
# @DESCRIPTION:
# Call elisp-install to install all Emacs Lisp (*.el and *.elc) files.
# If the SITEFILE variable specifies a site-init file, install it with
# elisp-site-file-install.  Also install any GNU Info files listed in
# ELISP_TEXINFO and documentation listed in the DOCS variable.

elisp_src_install() {
	elisp-install ${PN} *.el *.elc
	if [[ -n ${SITEFILE} ]]; then
		elisp-site-file-install "${FILESDIR}/${SITEFILE}"
	fi
	if [[ -n ${ELISP_TEXINFO} ]]; then
		set -- ${ELISP_TEXINFO}
		set -- ${@##*/}
		doinfo ${@/%.*/.info*} || die
	fi
	if [[ -n ${DOCS} ]]; then
		dodoc ${DOCS} || die
	fi
	if declare -f readme.gentoo_create_doc >/dev/null; then
		readme.gentoo_create_doc
	fi
}

# @FUNCTION: elisp_pkg_postinst
# @DESCRIPTION:
# Call elisp-site-regen, in order to collect the site initialisation for
# all installed Emacs Lisp packages in the site-gentoo.el file.

elisp_pkg_postinst() {
	elisp-site-regen
	if declare -f readme.gentoo_print_elog >/dev/null; then
		readme.gentoo_print_elog
	fi
}

# @FUNCTION: elisp_pkg_postrm
# @DESCRIPTION:
# Call elisp-site-regen, in order to collect the site initialisation for
# all installed Emacs Lisp packages in the site-gentoo.el file.

elisp_pkg_postrm() {
	elisp-site-regen
}