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# Copyright 1999-2007 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License v2
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# $Header: /var/cvsroot/gentoo-x86/eclass/elisp-common.eclass,v 1.34 2007/12/28 17:48:34 ulm Exp $
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#
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# Copyright 2002-2004 Matthew Kennedy <mkennedy@gentoo.org>
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# Copyright 2003 Jeremy Maitin-Shepard <jbms@attbi.com>
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# Copyright 2004-2005 Mamoru Komachi <usata@gentoo.org>
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# Copyright 2007-2008 Christian Faulhammer <opfer@gentoo.org>
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# Copyright 2007-2008 Ulrich Müller <ulm@gentoo.org>
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#
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# @ECLASS: elisp-common.eclass
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# @MAINTAINER:
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# Feel free to contact the Emacs team through <emacs@gentoo.org> if you have
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# problems, suggestions or questions.
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# @BLURB: Emacs-related installation utilities
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# @DESCRIPTION:
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#
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# Usually you want to use this eclass for (optional) GNU Emacs support of
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# your package. This is NOT for XEmacs!
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#
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# Many of the steps here are sometimes done by the build system of your
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# package (especially compilation), so this is mainly for standalone elisp
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# files you gathered from somewhere else.
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#
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# When relying on the emacs USE flag, you need to add
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#
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# emacs? ( virtual/emacs )
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#
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# to your DEPEND/RDEPEND line and use the functions provided here to bring
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# the files to the correct locations.
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#
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# .SS
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# src_compile() usage:
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#
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# An elisp file is compiled by the elisp-compile() function defined here and
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# simply takes the source files as arguments.
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#
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# elisp-compile *.el || die "elisp-compile failed"
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#
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# In the case of interdependent elisp files, you can use the elisp-comp()
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# function which makes sure all files are loadable.
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#
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# elisp-comp *.el || die "elisp-comp failed"
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#
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# Function elisp-make-autoload-file() can be used to generate a file with
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# autoload definitions for the lisp functions. It takes the output file name
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# (default: "${PN}-autoloads.el") and a list of directories (default: working
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# directory) as its arguments. Use of this function requires that the elisp
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# source files contain magic ";;;###autoload" comments. See the Emacs Lisp
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# Reference Manual (node "Autoload") for a detailed explanation.
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#
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# .SS
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# src_install() usage:
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#
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# The resulting compiled files (.elc) should be put in a subdirectory of
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# /usr/share/emacs/site-lisp/ which is named after the first argument
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# of elisp-install(). The following parameters are the files to be put in
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# that directory. Usually the subdirectory should be ${PN}, you can choose
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# something else, but remember to tell elisp-site-file-install() (see below)
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# the change, as it defaults to ${PN}.
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#
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# elisp-install ${PN} *.el *.elc || die "elisp-install failed"
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#
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# To let the Emacs support be activated by Emacs on startup, you need
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# to provide a site file (shipped in ${FILESDIR}) which contains the startup
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# code (have a look in the documentation of your software). Normally this
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# would look like this:
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#
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# ;;; csv-mode site-lisp configuration
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#
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# (add-to-list 'load-path "@SITELISP@")
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# (add-to-list 'auto-mode-alist '("\\.csv\\'" . csv-mode))
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# (autoload 'csv-mode "csv-mode" "Major mode for csv files." t)
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#
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# If your Emacs support files are installed in a subdirectory of
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# /usr/share/emacs/site-lisp/ (which is recommended), you need to extend
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# Emacs' load-path as shown in the first non-comment.
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# The elisp-site-file-install() function of this eclass will replace
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# "@SITELISP@" by the actual path.
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#
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# The next line tells Emacs to load the mode opening a file ending with
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# ".csv" and load functions depending on the context and needed features.
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# Be careful though. Commands as "load-library" or "require" bloat the
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# editor as they are loaded on every startup. When having a lot of Emacs
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# support files, users may be annoyed by the start-up time. Also avoid
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# keybindings as they might interfere with the user's settings. Give a hint
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# in pkg_postinst(), which should be enough.
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#
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# The naming scheme for this site file is "[0-9][0-9]*-gentoo.el", where the
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# two digits at the beginning define the loading order. So if you depend on
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# another Emacs package, your site file's number must be higher!
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#
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# Best practice is to define a SITEFILE variable in the global scope of your
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# ebuild (right after DEPEND e.g.):
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#
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# SITEFILE=50${PN}-gentoo.el
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#
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# Which is then installed by
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#
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# elisp-site-file-install "${FILESDIR}/${SITEFILE}" || die
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#
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# in src_install(). If your subdirectory is not named ${PN}, give the
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# differing name as second argument.
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#
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# .SS
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# pkg_postinst() / pkg_postrm() usage:
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#
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# After that you need to recreate the start-up file of Emacs after emerging
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# and unmerging by using
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#
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# pkg_postinst() {
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# elisp-site-regen
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# }
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#
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# pkg_postrm() {
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# elisp-site-regen
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# }
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#
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# When having optional Emacs support, you should prepend "use emacs &&" to
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# above calls of elisp-site-regen(). Don't use "has_version virtual/emacs"!
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# When unmerging the state of the emacs USE flag is taken from the package
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# database and not from the environment, so it is no problem when you unset
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# USE=emacs between merge and unmerge of a package.
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#
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# .SS
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# Miscellaneous functions:
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#
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# elisp-emacs-version() outputs the version of the currently active Emacs.
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# @ECLASS-VARIABLE: SITELISP
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# @DESCRIPTION:
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# Directory where packages install Emacs Lisp files.
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SITELISP=/usr/share/emacs/site-lisp
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# Directory where packages install miscellaneous (not Lisp) files.
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SITEETC=/usr/share/emacs/etc
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# @ECLASS-VARIABLE: SITEFILE
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# @DESCRIPTION:
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# Name of package's site-init file.
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SITEFILE=50${PN}-gentoo.el
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EMACS=/usr/bin/emacs
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# The following works for Emacs versions 18--23, don't change it.
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EMACSFLAGS="-batch -q --no-site-file"
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# @FUNCTION: elisp-compile
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# @USAGE: <list of elisp files>
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# @DESCRIPTION:
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# Byte-compile Emacs Lisp files.
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elisp-compile() {
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ebegin "Compiling GNU Emacs Elisp files"
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${EMACS} ${EMACSFLAGS} -f batch-byte-compile "$@"
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eend $? "batch-byte-compile failed"
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}
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# @FUNCTION: elisp-comp
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# @USAGE: <list of elisp files>
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# @DESCRIPTION:
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# Byte-compile interdependent Emacs Lisp files.
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#
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# This function byte-compiles all ".el" files which are part of its
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# arguments, using GNU Emacs, and puts the resulting ".elc" files into the
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# current directory, so disregarding the original directories used in ".el"
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# arguments.
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#
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# This function manages in such a way that all Emacs Lisp files to be
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# compiled are made visible between themselves, in the event they require or
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# load one another.
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elisp-comp() {
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# Copyright 1995 Free Software Foundation, Inc.
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# François Pinard <pinard@iro.umontreal.ca>, 1995.
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# Originally taken from GNU autotools.
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[ $# -gt 0 ] || return 1
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ebegin "Compiling GNU Emacs Elisp files"
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tempdir=elc.$$
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mkdir ${tempdir}
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cp "$@" ${tempdir}
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pushd ${tempdir}
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echo "(add-to-list 'load-path \"../\")" > script
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${EMACS} ${EMACSFLAGS} -l script -f batch-byte-compile *.el
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local ret=$?
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mv *.elc ..
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popd
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rm -fr ${tempdir}
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eend ${ret} "batch-byte-compile failed"
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return ${ret}
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}
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# @FUNCTION: elisp-emacs-version
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# @DESCRIPTION:
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# Output version of currently active Emacs.
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elisp-emacs-version() {
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# The following will work for at least versions 18--23.
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echo "(princ emacs-version)" >"${T}"/emacs-version.el
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${EMACS} ${EMACSFLAGS} -l "${T}"/emacs-version.el
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}
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# @FUNCTION: elisp-make-autoload-file
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# @USAGE: [output file] [list of directories]
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# @DESCRIPTION:
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# Generate a file with autoload definitions for the lisp functions.
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elisp-make-autoload-file() {
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local f="${1:-${PN}-autoloads.el}"
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shift
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ebegin "Generating autoload file for GNU Emacs"
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sed 's/^FF/\f/' >"${f}" <<-EOF
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;;; ${f##*/} --- autoloads for ${P}
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;;; Commentary:
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;; Automatically generated by elisp-common.eclass
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;; DO NOT EDIT THIS FILE
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;;; Code:
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FF
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;; Local Variables:
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;; version-control: never
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;; no-byte-compile: t
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;; no-update-autoloads: t
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;; End:
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;;; ${f##*/} ends here
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EOF
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${EMACS} ${EMACSFLAGS} \
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--eval "(setq make-backup-files nil)" \
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--eval "(setq generated-autoload-file (expand-file-name \"${f}\"))" \
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-f batch-update-autoloads "${@-.}"
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eend $? "batch-update-autoloads failed"
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}
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# @FUNCTION: elisp-install
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# @USAGE: <subdirectory> <list of files>
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# @DESCRIPTION:
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# Install files in SITELISP directory.
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elisp-install() {
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local subdir="$1"
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shift
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ebegin "Installing Elisp files for GNU Emacs support"
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( # subshell to avoid pollution of calling environment
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insinto "${SITELISP}/${subdir}"
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doins "$@"
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)
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eend $? "doins failed"
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}
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# @FUNCTION: elisp-site-file-install
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# @USAGE: <site-init file> [subdirectory]
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# @DESCRIPTION:
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# Install Emacs site-init file in SITELISP directory.
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elisp-site-file-install() {
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local sf="${1##*/}" my_pn="${2:-${PN}}"
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ebegin "Installing site initialisation file for GNU Emacs"
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cp "$1" "${T}/${sf}"
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sed -i -e "s:@SITELISP@:${SITELISP}/${my_pn}:g" \
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-e "s:@SITEETC@:${SITEETC}/${my_pn}:g" "${T}/${sf}"
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( # subshell to avoid pollution of calling environment
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insinto "${SITELISP}/site-gentoo.d"
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doins "${T}/${sf}"
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)
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eend $? "doins failed"
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}
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# @FUNCTION: elisp-site-regen
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# @DESCRIPTION:
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# Regenerate site-gentoo.el file. The old location for site initialisation
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# files of packages was /usr/share/emacs/site-lisp/. In December 2007 this
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# has been changed to /usr/share/emacs/site-lisp/site-gentoo.d/. Remerge of
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# packages with Emacs support is enough, the old location is still supported
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# when generating the start-up file.
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elisp-site-regen() {
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local i sf line obsolete
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local -a sflist
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if [ ! -e "${ROOT}${SITELISP}"/site-gentoo.el ] \
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&& [ ! -e "${ROOT}${SITELISP}"/site-start.el ]; then
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einfo "Creating default ${SITELISP}/site-start.el ..."
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cat <<-EOF >"${T}"/site-start.el
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;;; site-start.el
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;;; Commentary:
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;; This default site startup file is installed by elisp-common.eclass.
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;; You may replace this file by your own site initialisation, or even
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;; remove it completely; it will not be recreated.
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;;; Code:
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;; Load site initialisation for Gentoo-installed packages.
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(require 'site-gentoo)
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;;; site-start.el ends here
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EOF
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fi
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einfon "Regenerating ${SITELISP}/site-gentoo.el ..."
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# remove auxiliary file
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rm -f "${ROOT}${SITELISP}"/00site-gentoo.el
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# set nullglob option, there may be a directory without matching files
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local old_shopts=$(shopt -p nullglob)
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shopt -s nullglob
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for sf in "${ROOT}${SITELISP}"/[0-9][0-9]*-gentoo.el \
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"${ROOT}${SITELISP}"/site-gentoo.d/[0-9][0-9]*.el
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do
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[ -r "${sf}" ] || continue
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# sort files by their basename. straight insertion sort.
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for ((i=${#sflist[@]}; i>0; i--)); do
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[[ ${sf##*/} < ${sflist[i-1]##*/} ]] || break
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sflist[i]=${sflist[i-1]}
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done
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sflist[i]=${sf}
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# set a flag if there are obsolete files
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[ "${sf%/*}" = "${ROOT}${SITELISP}" ] && obsolete=t
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done
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eval "${old_shopts}"
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cat <<-EOF >"${T}"/site-gentoo.el
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;;; site-gentoo.el --- site initialisation for Gentoo-installed packages
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;;; Commentary:
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;; Automatically generated by elisp-common.eclass
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;; DO NOT EDIT THIS FILE
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;;; Code:
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EOF
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cat "${sflist[@]}" </dev/null >>"${T}"/site-gentoo.el
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cat <<-EOF >>"${T}"/site-gentoo.el
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(provide 'site-gentoo)
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;; Local Variables:
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;; no-byte-compile: t
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;; End:
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;;; site-gentoo.el ends here
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EOF
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if cmp -s "${ROOT}${SITELISP}"/site-gentoo.el "${T}"/site-gentoo.el; then
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# This prevents outputting unnecessary text when there
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# was actually no change.
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# A case is a remerge where we have doubled output.
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echo " no changes."
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else
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mv "${T}"/site-gentoo.el "${ROOT}${SITELISP}"/site-gentoo.el
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[ -f "${T}"/site-start.el ] \
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&& [ ! -e "${ROOT}${SITELISP}"/site-start.el ] \
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&& mv "${T}"/site-start.el "${ROOT}${SITELISP}"/site-start.el
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echo; einfo
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for sf in "${sflist[@]##*/}"; do
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einfo " Adding ${sf} ..."
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done
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einfo "Regenerated ${SITELISP}/site-gentoo.el."
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echo
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while read line; do einfo "${line}"; done <<EOF
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All site initialisation for Gentoo-installed packages is added to
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/usr/share/emacs/site-lisp/site-gentoo.el; site-start.el is no longer
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managed by Gentoo. You are responsible for all maintenance of
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site-start.el if there is such a file.
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In order for this site initialisation to be loaded for all users
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automatically, you can add a line like this:
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(require 'site-gentoo)
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to /usr/share/emacs/site-lisp/site-start.el. Alternatively, that line
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can be added by individual users to their initialisation files, or,
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for greater flexibility, users can load individual package-specific
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initialisation files from /usr/share/emacs/site-lisp/site-gentoo.d/.
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EOF
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echo
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if [ "${obsolete}" ]; then
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while read line; do ewarn "${line}"; done <<-EOF
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Site-initialisation files of Emacs packages are now installed in
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/usr/share/emacs/site-lisp/site-gentoo.d/. You may consider using
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/usr/sbin/emacs-updater to rebuild the installed Emacs packages.
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However, the old location is still supported.
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EOF
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echo
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fi
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fi
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# Kludge for backwards compatibility: During pkg_postrm, old versions
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# of this eclass (saved in the VDB) won't find packages' site-init files
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# in the new location. So we copy them to an auxiliary file that is
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# visible to old eclass versions.
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for sf in "${sflist[@]}"; do
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[ "${sf%/*}" = "${ROOT}${SITELISP}/site-gentoo.d" ] \
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&& cat "${sf}" >>"${ROOT}${SITELISP}"/00site-gentoo.el
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done
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}
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