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# Copyright 1999-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/elisp-common.eclass,v 1.65 2009/12/29 20:15:12 ulm Exp $
#
# Copyright 2002-2004 Matthew Kennedy <mkennedy@gentoo.org>
# Copyright 2003 Jeremy Maitin-Shepard <jbms@attbi.com>
# Copyright 2004-2005 Mamoru Komachi <usata@gentoo.org>
# Copyright 2007-2008 Christian Faulhammer <fauli@gentoo.org>
# Copyright 2007-2009 Ulrich Müller <ulm@gentoo.org>
#
# @ECLASS: elisp-common.eclass
# @MAINTAINER:
# Feel free to contact the Emacs team through <emacs@gentoo.org> if you
# have problems, suggestions or questions.
# @BLURB: Emacs-related installation utilities
# @DESCRIPTION:
#
# Usually you want to use this eclass for (optional) GNU Emacs support
# of your package. This is NOT for XEmacs!
#
# Many of the steps here are sometimes done by the build system of your
# package (especially compilation), so this is mainly for standalone
# elisp files you gathered from somewhere else.
#
# When relying on the emacs USE flag, you need to add
#
# emacs? ( virtual/emacs )
#
# to your DEPEND/RDEPEND line and use the functions provided here to
# bring the files to the correct locations.
#
# .SS
# src_compile() usage:
#
# An elisp file is compiled by the elisp-compile() function defined
# here and simply takes the source files as arguments. The case of
# interdependent elisp files is also supported, since the current
# directory is added to the load-path which makes sure that all files
# are loadable.
#
# elisp-compile *.el || die
#
# Function elisp-make-autoload-file() can be used to generate a file
# with autoload definitions for the lisp functions. It takes the output
# file name (default: "${PN}-autoloads.el") and a list of directories
# (default: working directory) as its arguments. Use of this function
# requires that the elisp source files contain magic ";;;###autoload"
# comments. See the Emacs Lisp Reference Manual (node "Autoload") for
# a detailed explanation.
#
# .SS
# src_install() usage:
#
# The resulting compiled files (.elc) should be put in a subdirectory of
# /usr/share/emacs/site-lisp/ which is named after the first argument
# of elisp-install(). The following parameters are the files to be put
# in that directory. Usually the subdirectory should be ${PN}, you can
# choose something else, but remember to tell elisp-site-file-install()
# (see below) the change, as it defaults to ${PN}.
#
# elisp-install ${PN} *.el *.elc || die
#
# To let the Emacs support be activated by Emacs on startup, you need
# to provide a site file (shipped in ${FILESDIR}) which contains the
# startup code (have a look in the documentation of your software).
# Normally this would look like this:
#
# (add-to-list 'load-path "@SITELISP@")
# (add-to-list 'auto-mode-alist '("\\.csv\\'" . csv-mode))
# (autoload 'csv-mode "csv-mode" "Major mode for csv files." t)
#
# If your Emacs support files are installed in a subdirectory of
# /usr/share/emacs/site-lisp/ (which is strongly recommended), you need
# to extend Emacs' load-path as shown in the first non-comment line.
# The elisp-site-file-install() function of this eclass will replace
# "@SITELISP@" and "@SITEETC@" by the actual paths.
#
# The next line tells Emacs to load the mode opening a file ending
# with ".csv" and load functions depending on the context and needed
# features. Be careful though. Commands as "load-library" or "require"
# bloat the editor as they are loaded on every startup. When having
# many Emacs support files, users may be annoyed by the start-up time.
# Also avoid keybindings as they might interfere with the user's
# settings. Give a hint in pkg_postinst(), which should be enough.
#
# The naming scheme for this site-init file matches the shell pattern
# "[1-8][0-9]*-gentoo*.el", where the two digits at the beginning define
# the loading order (numbers below 10 or above 89 are reserved for
# internal use). So if your initialisation depends on another Emacs
# package, your site file's number must be higher!
#
# Best practice is to define a SITEFILE variable in the global scope of
# your ebuild (e.g., right after S or RDEPEND):
#
# SITEFILE="50${PN}-gentoo.el"
#
# Which is then installed by
#
# elisp-site-file-install "${FILESDIR}/${SITEFILE}" || die
#
# in src_install(). Any characters after the "-gentoo" part and before
# the extension will be stripped from the destination file's name.
# For example, a file "50${PN}-gentoo-${PV}.el" will be installed as
# "50${PN}-gentoo.el". If your subdirectory is not named ${PN}, give
# the differing name as second argument.
#
# .SS
# pkg_postinst() / pkg_postrm() usage:
#
# After that you need to recreate the start-up file of Emacs after
# emerging and unmerging by using
#
# pkg_postinst() {
# elisp-site-regen
# }
#
# pkg_postrm() {
# elisp-site-regen
# }
#
# When having optional Emacs support, you should prepend "use emacs &&"
# to above calls of elisp-site-regen().
# Don't use "has_version virtual/emacs"! When unmerging the state of
# the emacs USE flag is taken from the package database and not from the
# environment, so it is no problem when you unset USE=emacs between
# merge and unmerge of a package.
#
# .SS
# Miscellaneous functions:
#
# elisp-emacs-version() outputs the version of the currently active Emacs.
# @ECLASS-VARIABLE: SITELISP
# @DESCRIPTION:
# Directory where packages install Emacs Lisp files.
SITELISP=/usr/share/emacs/site-lisp
# @ECLASS-VARIABLE: SITEETC
# @DESCRIPTION:
# Directory where packages install miscellaneous (not Lisp) files.
SITEETC=/usr/share/emacs/etc
# @ECLASS-VARIABLE: EMACS
# @DESCRIPTION:
# Path of Emacs executable.
EMACS=${EPREFIX}/usr/bin/emacs
# @ECLASS-VARIABLE: EMACSFLAGS
# @DESCRIPTION:
# Flags for executing Emacs in batch mode.
# These work for Emacs versions 18-23, so don't change them.
EMACSFLAGS="-batch -q --no-site-file"
# @ECLASS-VARIABLE: BYTECOMPFLAGS
# @DESCRIPTION:
# Emacs flags used for byte-compilation in elisp-compile().
BYTECOMPFLAGS="-L ."
# @FUNCTION: elisp-compile
# @USAGE: <list of elisp files>
# @DESCRIPTION:
# Byte-compile Emacs Lisp files.
#
# This function uses GNU Emacs to byte-compile all ".el" specified by
# its arguments. The resulting byte-code (".elc") files are placed in
# the same directory as their corresponding source file.
#
# The current directory is added to the load-path. This will ensure
# that interdependent Emacs Lisp files are visible between themselves,
# in case they require or load one another.
elisp-compile() {
ebegin "Compiling GNU Emacs Elisp files"
${EMACS} ${EMACSFLAGS} ${BYTECOMPFLAGS} -f batch-byte-compile "$@"
eend $? "elisp-compile: batch-byte-compile failed"
}
elisp-comp() {
die "Function elisp-comp is not supported any more, see bug 235442"
}
# @FUNCTION: elisp-emacs-version
# @DESCRIPTION:
# Output version of currently active Emacs.
elisp-emacs-version() {
# The following will work for at least versions 18-23.
echo "(princ emacs-version)" >"${T}"/emacs-version.el
${EMACS} ${EMACSFLAGS} -l "${T}"/emacs-version.el
rm -f "${T}"/emacs-version.el
}
# @FUNCTION: elisp-make-autoload-file
# @USAGE: [output file] [list of directories]
# @DESCRIPTION:
# Generate a file with autoload definitions for the lisp functions.
elisp-make-autoload-file() {
local f="${1:-${PN}-autoloads.el}" null="" page=$'\f'
shift
ebegin "Generating autoload file for GNU Emacs"
cat >"${f}" <<-EOF
;;; ${f##*/} --- autoloads for ${P}
;;; Commentary:
;; Automatically generated by elisp-common.eclass
;; DO NOT EDIT THIS FILE
;;; Code:
${page}
;; Local ${null}Variables:
;; version-control: never
;; no-byte-compile: t
;; no-update-autoloads: t
;; End:
;;; ${f##*/} ends here
EOF
${EMACS} ${EMACSFLAGS} \
--eval "(setq make-backup-files nil)" \
--eval "(setq generated-autoload-file (expand-file-name \"${f}\"))" \
-f batch-update-autoloads "${@-.}"
eend $? "elisp-make-autoload-file: batch-update-autoloads failed"
}
# @FUNCTION: elisp-install
# @USAGE: <subdirectory> <list of files>
# @DESCRIPTION:
# Install files in SITELISP directory.
elisp-install() {
local subdir="$1"
shift
ebegin "Installing Elisp files for GNU Emacs support"
( # subshell to avoid pollution of calling environment
insinto "${SITELISP}/${subdir}"
doins "$@"
)
eend $? "elisp-install: doins failed"
}
# @FUNCTION: elisp-site-file-install
# @USAGE: <site-init file> [subdirectory]
# @DESCRIPTION:
# Install Emacs site-init file in SITELISP directory. Automatically
# inserts a standard comment header with the name of the package (unless
# it is already present). Tokens @SITELISP@ and @SITEETC@ are replaced
# by the path to the package's subdirectory in SITELISP and SITEETC,
# respectively.
elisp-site-file-install() {
local sf="${1##*/}" my_pn="${2:-${PN}}" ret
local header=";;; ${PN} site-lisp configuration"
[[ ${sf} == [0-9][0-9]*-gentoo*.el ]] \
|| ewarn "elisp-site-file-install: bad name of site-init file"
sf="${T}/${sf/%-gentoo*.el/-gentoo.el}"
ebegin "Installing site initialisation file for GNU Emacs"
[[ $1 = ${sf} ]] || cp "$1" "${sf}"
sed -i -e "1{:x;/^\$/{n;bx;};/^;.*${PN}/I!s:^:${header}\n\n:;1s:^:\n:;}" \
-e "s:@SITELISP@:${EPREFIX}${SITELISP}/${my_pn}:g" \
-e "s:@SITEETC@:${EPREFIX}${SITEETC}/${my_pn}:g;\$q" "${sf}"
( # subshell to avoid pollution of calling environment
insinto "${SITELISP}/site-gentoo.d"
doins "${sf}"
)
ret=$?
rm -f "${sf}"
eend ${ret} "elisp-site-file-install: doins failed"
}
# @FUNCTION: elisp-site-regen
# @DESCRIPTION:
# Regenerate the site-gentoo.el file, based on packages' site
# initialisation files in the /usr/share/emacs/site-lisp/site-gentoo.d/
# directory.
#
# Note: Before December 2007, site initialisation files were installed
# in /usr/share/emacs/site-lisp/. For backwards compatibility, this
# location is still supported when generating site-gentoo.el.
elisp-site-regen() {
local sitelisp=${ROOT}${EPREFIX}${SITELISP}
local sf i line null="" page=$'\f'
local -a sflist
if [ ! -d "${sitelisp}" ]; then
eerror "elisp-site-regen: Directory ${sitelisp} does not exist"
return 1
fi
if [ ! -d "${T}" ]; then
eerror "elisp-site-regen: Temporary directory ${T} does not exist"
return 1
fi
einfon "Regenerating site-gentoo.el for GNU Emacs (${EBUILD_PHASE}) ..."
# Until January 2009, elisp-common.eclass sometimes created an
# auxiliary file for backwards compatibility. Remove any such file.
rm -f "${sitelisp}"/00site-gentoo.el
# set nullglob option, there may be a directory without matching files
local old_shopts=$(shopt -p nullglob)
shopt -s nullglob
for sf in "${sitelisp}"/[0-9][0-9]*-gentoo.el \
"${sitelisp}"/site-gentoo.d/[0-9][0-9]*.el
do
[ -r "${sf}" ] || continue
# sort files by their basename. straight insertion sort.
for ((i=${#sflist[@]}; i>0; i--)); do
[[ ${sf##*/} < ${sflist[i-1]##*/} ]] || break
sflist[i]=${sflist[i-1]}
done
sflist[i]=${sf}
done
eval "${old_shopts}"
cat <<-EOF >"${T}"/site-gentoo.el
;;; site-gentoo.el --- site initialisation for Gentoo-installed packages
;;; Commentary:
;; Automatically generated by elisp-common.eclass
;; DO NOT EDIT THIS FILE
;;; Code:
EOF
# Use sed instead of cat here, since files may miss a trailing newline.
sed '$q' "${sflist[@]}" </dev/null >>"${T}"/site-gentoo.el
cat <<-EOF >>"${T}"/site-gentoo.el
(provide 'site-gentoo)
${page}
;; Local ${null}Variables:
;; no-byte-compile: t
;; buffer-read-only: t
;; End:
;;; site-gentoo.el ends here
EOF
if cmp -s "${sitelisp}"/site-gentoo.el "${T}"/site-gentoo.el; then
# This prevents outputting unnecessary text when there
# was actually no change.
# A case is a remerge where we have doubled output.
echo " no changes."
else
mv "${T}"/site-gentoo.el "${sitelisp}"/site-gentoo.el
echo
case ${#sflist[@]} in
0) ewarn "... Huh? No site initialisation files found." ;;
1) einfo "... ${#sflist[@]} site initialisation file included." ;;
*) einfo "... ${#sflist[@]} site initialisation files included." ;;
esac
fi
# cleanup
rm -f "${T}"/site-gentoo.el
return 0
}