Add common-lisp-3.eclass from the lisp overlay, required by app-emacs/slime-2.11

diff --git a/eclass/common-lisp-3.eclass b/eclass/common-lisp-3.eclass
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+# Copyright 1999-2010 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: /var/cvsroot/gentoo-x86/eclass/common-lisp-3.eclass,v 1.1 2014/12/19 06:52:10 gienah Exp $
+
+# @ECLASS: common-lisp-3.eclass
+# @MAINTAINER:
+# Common Lisp project <common-lisp@gentoo.org>
+# @BLURB: functions to support the installation of Common Lisp libraries
+# @DESCRIPTION:
+# Since Common Lisp libraries share similar structure, this eclass aims
+# to provide a simple way to write ebuilds with these characteristics.
+
+inherit eutils
+
+# CL packages in the overlay don't have their tarballs on the mirrors
+# so it's useless to mirror them
+RESTRICT="mirror"
+
+# @ECLASS-VARIABLE: CLSOURCEROOT
+# @DESCRIPTION:
+# Default path of Common Lisp libraries sources. Sources will
+# be installed into ${CLSOURCEROOT}/${CLPACKAGE}.
+CLSOURCEROOT="${ROOT%/}"/usr/share/common-lisp/source
+
+# @ECLASS-VARIABLE: CLSYSTEMROOT
+# @DESCRIPTION:
+# Default path to find any asdf file. Any asdf files will be
+# symlinked in ${CLSYSTEMROOT}/${CLSYSTEM} as they may be in
+# an arbitrarily deeply nested directory under ${CLSOURCEROOT}/${CLPACKAGE}.
+CLSYSTEMROOT="${ROOT%/}"/usr/share/common-lisp/systems
+
+# @ECLASS-VARIABLE: CLPACKAGE
+# @DESCRIPTION:
+# Default package name. To override, set these after inheriting this eclass.
+CLPACKAGE="${PN}"
+
+PDEPEND="virtual/commonlisp"
+
+EXPORT_FUNCTIONS src_compile src_install
+
+# @FUNCTION: common-lisp-3_src_compile
+# @DESCRIPTION:
+# Since there's nothing to build in most cases, default doesn't do
+# anything.
+common-lisp-3_src_compile() { true; }
+
+# @FUNCTION: absolute-path-p
+# @DESCRIPTION:
+# Returns true if ${1} is an absolute path.
+absolute-path-p() {
+       [[ $# -eq 1 ]] || die "${FUNCNAME[0]} must receive one argument"
+       [[ ${1} == /* ]]
+}
+
+# @FUNCTION: common-lisp-install-one-source
+# @DESCRIPTION:
+# Installs ${2} source file in ${3} inside CLSOURCEROOT/CLPACKAGE.
+common-lisp-install-one-source() {
+       [[ $# -eq 3 ]] || die "${FUNCNAME[0]} must receive exactly three arguments"
+
+       local fpredicate=${1}
+       local source=${2}
+       local target="${CLSOURCEROOT}/${CLPACKAGE}/${3}"
+
+       if absolute-path-p "${source}" ; then
+               die "Cannot install files with absolute path: ${source}"
+       fi
+
+       if ${fpredicate} "${source}" ; then
+               insinto "${target}"
+               doins "${source}" || die "Failed to install ${source} into $(dirname "${target}")"
+       fi
+}
+
+# @FUNCTION: lisp-file-p
+# @DESCRIPTION:
+# Returns true if ${1} is lisp source file.
+lisp-file-p() {
+       [[ $# -eq 1 ]] || die "${FUNCNAME[0]} must receive one argument"
+
+       [[ ${1} =~ \.(lisp|lsp|cl)$ ]]
+}
+
+# @FUNCTION: common-lisp-get-fpredicate
+# @DESCRIPTION:
+# Outputs the corresponding predicate to check files of type ${1}.
+common-lisp-get-fpredicate() {
+       [[ $# -eq 1 ]] || die "${FUNCNAME[0]} must receive one argument"
+
+       local ftype=${1}
+       case ${ftype} in
+               "lisp") echo "lisp-file-p" ;;
+               "all" ) echo "true" ;;
+               * ) die "Unknown filetype specifier ${ftype}" ;;
+       esac
+}
+
+# @FUNCTION: common-lisp-install-sources
+# @USAGE: common-lisp-install-sources path [<other_paths>...]
+# @DESCRIPTION:
+# Recursively install lisp sources of type ${2} if ${1} is -t or
+# Lisp by default. When given a directory, it will be recursively
+# scanned for Lisp source files with suffixes: .lisp, .lsp or .cl.
+common-lisp-install-sources() {
+       local ftype="lisp"
+       if [[ ${1} == "-t" ]] ; then
+               ftype=${2}
+               shift ; shift
+       fi
+
+       [[ $# -ge 1 ]] || die "${FUNCNAME[0]} must receive one non-option argument"
+
+       local fpredicate=$(common-lisp-get-fpredicate "${ftype}")
+
+       for path in "${@}" ; do
+               if [[ -f ${path} ]] ; then
+                       common-lisp-install-one-source ${fpredicate} "${path}" "$(dirname "${path}")"
+               elif [[ -d ${path} ]] ; then
+                       common-lisp-install-sources -t ${ftype} $(find "${path}" -type f)
+               else
+                       die "${path} it neither a regular file nor a directory"
+               fi
+       done
+}
+
+# @FUNCTION: common-lisp-install-one-asdf
+# @DESCRIPTION:
+# Installs ${1} asdf file in CLSOURCEROOT/CLPACKAGE and symlinks it in
+# CLSYSTEMROOT.
+common-lisp-install-one-asdf() {
+       [[ $# != 1 ]] && die "${FUNCNAME[0]} must receive exactly one argument"
+
+       # the suffix «.asd» is optional
+       local source=${1/.asd}.asd
+       common-lisp-install-one-source true "${source}" "$(dirname "${source}")"
+       local target="${CLSOURCEROOT%/}/${CLPACKAGE}/${source}"
+       dosym "${target}" "${CLSYSTEMROOT%/}/$(basename ${target})"
+}
+
+# @FUNCTION: common-lisp-install-asdf
+# @USAGE: common-lisp-install-asdf path [<other_paths>...]
+# @DESCRIPTION:
+# Installs all ASDF files and creates symlinks in CLSYSTEMROOT.
+# When given a directory, it will be recursively scanned for ASDF
+# files with extension .asd.
+common-lisp-install-asdf() {
+       dodir "${CLSYSTEMROOT}"
+
+       [[ $# = 0 ]] && set - ${CLSYSTEMS}
+       [[ $# = 0 ]] && set - $(find . -type f -name \*.asd)
+       for sys in "${@}" ; do
+               common-lisp-install-one-asdf ${sys}
+       done
+}
+
+# @FUNCTION: common-lisp-3_src_install
+# @DESCRIPTION:
+# Recursively install Lisp sources, asdf files and most common doc files.
+common-lisp-3_src_install() {
+       common-lisp-install-sources .
+       common-lisp-install-asdf
+       for i in AUTHORS README* HEADER TODO* CHANGELOG Change[lL]og CHANGES BUGS CONTRIBUTORS *NEWS* ; do
+               [[ -f ${i} ]] && dodoc ${i}
+       done
+}
+
+# @FUNCTION: common-lisp-export-impl-args
+# @USAGE: common-lisp-export-impl-args <lisp-implementation>
+# @DESCRIPTION:
+#   Export a few variables containing the switches necessary
+#   to make the CL implementation perform basic functions:
+#   * CL_NORC: don't load syste-wide or user-specific initfiles
+#   * CL_LOAD: load a certain file
+#   * CL_EVAL: eval a certain expression at startup
+common-lisp-export-impl-args() {
+       if [[ $# != 1 ]]; then
+               eerror "Usage: ${FUNCNAME[0]} lisp-implementation"
+               die "${FUNCNAME[0]}: wrong number of arguments: $#"
+       fi
+       case ${1} in
+               clisp)
+                       CL_NORC="-norc"
+                       CL_LOAD="-i"
+                       CL_EVAL="-x"
+                       ;;
+               clozure | ccl | openmcl)
+                       CL_NORC="--no-init"
+                       CL_LOAD="--load"
+                       CL_EVAL="--eval"
+                       ;;
+               cmucl)
+                       CL_NORC="-nositeinit -noinit"
+                       CL_LOAD="-load"
+                       CL_EVAL="-eval"
+                       ;;
+               ecl)
+                       CL_NORC="-norc"
+                       CL_LOAD="-load"
+                       CL_EVAL="-eval"
+                       ;;
+               sbcl)
+                       CL_NORC="--sysinit /dev/null --userinit /dev/null"
+                       CL_LOAD="--load"
+                       CL_EVAL="--eval"
+                       ;;
+               *)
+                       die ${1} is not supported by ${0}
+                       ;;
+       esac
+       export CL_NORC CL_LOAD CL_EVAL
+}