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gentoo-overlay/eclass/haskell-cabal.eclass

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21 KiB

# Copyright 1999-2018 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: haskell-cabal.eclass
# @MAINTAINER:
# Haskell herd <haskell@gentoo.org>
# @AUTHOR:
# Original author: Andres Loeh <kosmikus@gentoo.org>
# Original author: Duncan Coutts <dcoutts@gentoo.org>
# @BLURB: for packages that make use of the Haskell Common Architecture for Building Applications and Libraries (cabal)
# @DESCRIPTION:
# Basic instructions:
#
# Before inheriting the eclass, set CABAL_FEATURES to
# reflect the tools and features that the package makes
# use of.
#
# Currently supported features:
# haddock -- for documentation generation
# hscolour -- generation of colourised sources
# hoogle -- generation of documentation search index
# profile -- if package supports to build profiling-enabled libraries
# bootstrap -- only used for the cabal package itself
# lib -- the package installs libraries
# nocabaldep -- don't add dependency on cabal.
# only used for packages that _must_ not pull the dependency
# on cabal, but still use this eclass (e.g. haskell-updater).
# ghcdeps -- constraint dependency on package to ghc onces
# only used for packages that use libghc internally and _must_
# not pull upper versions
# test-suite -- add support for cabal test-suites (introduced in Cabal-1.8)
inherit eutils ghc-package multilib toolchain-funcs
# @ECLASS-VARIABLE: CABAL_EXTRA_CONFIGURE_FLAGS
# @DESCRIPTION:
# User-specified additional parameters passed to 'setup configure'.
# example: /etc/portage/make.conf:
# CABAL_EXTRA_CONFIGURE_FLAGS="--enable-shared --enable-executable-dynamic"
: ${CABAL_EXTRA_CONFIGURE_FLAGS:=}
# @ECLASS-VARIABLE: CABAL_EXTRA_BUILD_FLAGS
# @DESCRIPTION:
# User-specified additional parameters passed to 'setup build'.
# example: /etc/portage/make.conf: CABAL_EXTRA_BUILD_FLAGS=-v
: ${CABAL_EXTRA_BUILD_FLAGS:=}
# @ECLASS-VARIABLE: GHC_BOOTSTRAP_FLAGS
# @DESCRIPTION:
# User-specified additional parameters for ghc when building
# _only_ 'setup' binary bootstrap.
# example: /etc/portage/make.conf: GHC_BOOTSTRAP_FLAGS=-dynamic to make
# linking 'setup' faster.
: ${GHC_BOOTSTRAP_FLAGS:=}
# @ECLASS-VARIABLE: CABAL_EXTRA_TEST_FLAGS
# @DESCRIPTION:
# User-specified additional parameters passed to 'setup test'.
# example: /etc/portage/make.conf:
# CABAL_EXTRA_TEST_FLAGS="-v3 --show-details=streaming"
: ${CABAL_EXTRA_TEST_FLAGS:=}
# @ECLASS-VARIABLE: CABAL_DEBUG_LOOSENING
# @DESCRIPTION:
# Show debug output for 'cabal_chdeps' function if set.
# Needs working 'diff'.
: ${CABAL_DEBUG_LOOSENING:=}
HASKELL_CABAL_EXPF="pkg_setup src_compile src_test src_install pkg_postinst pkg_postrm"
# 'dev-haskell/cabal' passes those options with ./configure-based
# configuration, but most packages don't need/don't accept it:
# #515362, #515362
QA_CONFIGURE_OPTIONS+=" --with-compiler --with-hc --with-hc-pkg --with-gcc"
case "${EAPI:-0}" in
2|3|4|5|6|7) HASKELL_CABAL_EXPF+=" src_configure" ;;
*) ;;
esac
EXPORT_FUNCTIONS ${HASKELL_CABAL_EXPF}
for feature in ${CABAL_FEATURES}; do
case ${feature} in
haddock) CABAL_USE_HADDOCK=yes;;
hscolour) CABAL_USE_HSCOLOUR=yes;;
hoogle) CABAL_USE_HOOGLE=yes;;
profile) CABAL_USE_PROFILE=yes;;
bootstrap) CABAL_BOOTSTRAP=yes;;
lib) CABAL_HAS_LIBRARIES=yes;;
nocabaldep) CABAL_FROM_GHC=yes;;
ghcdeps) CABAL_GHC_CONSTRAINT=yes;;
test-suite) CABAL_TEST_SUITE=yes;;
# does nothing, removed 2016-09-04
bin) ;;
*) CABAL_UNKNOWN="${CABAL_UNKNOWN} ${feature}";;
esac
done
if [[ -n "${CABAL_USE_HADDOCK}" ]]; then
IUSE="${IUSE} doc"
# don't require depend on itself to build docs.
# ebuild bootstraps docs from just built binary
#
# starting from ghc-7.10.2 we install haddock bundled with
# ghc to keep links to base and ghc library, otherwise
# newer haddock versions change index format and can't
# read index files for packages coming with ghc.
[[ ${CATEGORY}/${PN} = "dev-haskell/haddock" ]] || \
DEPEND="${DEPEND} doc? ( || ( dev-haskell/haddock >=dev-lang/ghc-7.10.2 ) )"
fi
if [[ -n "${CABAL_USE_HSCOLOUR}" ]]; then
IUSE="${IUSE} hscolour"
DEPEND="${DEPEND} hscolour? ( dev-haskell/hscolour )"
fi
if [[ -n "${CABAL_USE_HOOGLE}" ]]; then
# enabled only in ::haskell
#IUSE="${IUSE} hoogle"
CABAL_USE_HOOGLE=
fi
if [[ -n "${CABAL_USE_PROFILE}" ]]; then
IUSE="${IUSE} profile"
fi
if [[ -n "${CABAL_TEST_SUITE}" ]]; then
IUSE="${IUSE} test"
fi
# returns the version of cabal currently in use.
# Rarely it's handy to pin cabal version from outside.
: ${_CABAL_VERSION_CACHE:=""}
cabal-version() {
if [[ -z "${_CABAL_VERSION_CACHE}" ]]; then
if [[ "${CABAL_BOOTSTRAP}" ]]; then
# We're bootstrapping cabal, so the cabal version is the version
# of this package itself.
_CABAL_VERSION_CACHE="${PV}"
elif [[ "${CABAL_FROM_GHC}" ]]; then
_CABAL_VERSION_CACHE="$(ghc-cabal-version)"
else
# We ask portage, not ghc, so that we only pick up
# portage-installed cabal versions.
_CABAL_VERSION_CACHE="$(ghc-extractportageversion dev-haskell/cabal)"
fi
fi
echo "${_CABAL_VERSION_CACHE}"
}
cabal-bootstrap() {
local setupmodule
local cabalpackage
local setup_bootstrap_args=()
if [[ -f "${S}/Setup.lhs" ]]; then
setupmodule="${S}/Setup.lhs"
elif [[ -f "${S}/Setup.hs" ]]; then
setupmodule="${S}/Setup.hs"
else
eqawarn "No Setup.lhs or Setup.hs found. Either add Setup.hs to package or call cabal-mksetup from ebuild"
cabal-mksetup
setupmodule="${S}/Setup.hs"
fi
# We build the setup program using the latest version of
# cabal that we have installed
cabalpackage=Cabal-$(cabal-version)
einfo "Using cabal-$(cabal-version)."
if $(ghc-supports-threaded-runtime); then
# Cabal has a bug that deadlocks non-threaded RTS:
# https://bugs.gentoo.org/537500
# https://github.com/haskell/cabal/issues/2398
setup_bootstrap_args+=(-threaded)
fi
make_setup() {
set -- -package "${cabalpackage}" --make "${setupmodule}" \
$(ghc-make-args) \
"${setup_bootstrap_args[@]}" \
${HCFLAGS} \
${GHC_BOOTSTRAP_FLAGS} \
"$@" \
-o setup
echo $(ghc-getghc) "$@"
$(ghc-getghc) "$@"
}
if $(ghc-supports-shared-libraries); then
# # some custom build systems might use external libraries,
# # for which we don't have shared libs, so keep static fallback
# bug #411789, http://hackage.haskell.org/trac/ghc/ticket/5743#comment:3
# http://hackage.haskell.org/trac/ghc/ticket/7062
# http://hackage.haskell.org/trac/ghc/ticket/3072
# ghc does not set RPATH for extralibs, thus we do it ourselves by hands
einfo "Prepending $(ghc-libdir) to LD_LIBRARY_PATH"
if [[ ${CHOST} != *-darwin* ]]; then
LD_LIBRARY_PATH="$(ghc-libdir)${LD_LIBRARY_PATH:+:}${LD_LIBRARY_PATH}"
export LD_LIBRARY_PATH
else
DYLD_LIBRARY_PATH="$(ghc-libdir)${DYLD_LIBRARY_PATH:+:}${DYLD_LIBRARY_PATH}"
export DYLD_LIBRARY_PATH
fi
{ make_setup -dynamic "$@" && ./setup --help >/dev/null; } ||
make_setup "$@" || die "compiling ${setupmodule} failed"
else
make_setup "$@" || die "compiling ${setupmodule} failed"
fi
}
cabal-mksetup() {
local setupdir=${1:-${S}}
local setup_src=${setupdir}/Setup.hs
rm -vf "${setupdir}"/Setup.{lhs,hs}
elog "Creating 'Setup.hs' for 'Simple' build type."
echo 'import Distribution.Simple; main = defaultMain' \
> "${setup_src}" || die "failed to create default Setup.hs"
}
cabal-hscolour() {
set -- hscolour "$@"
echo ./setup "$@"
./setup "$@" || die "setup hscolour failed"
}
cabal-haddock() {
set -- haddock "$@"
echo ./setup "$@"
./setup "$@" || die "setup haddock failed"
}
cabal-hoogle() {
ewarn "hoogle USE flag requires doc USE flag, building without hoogle"
}
cabal-hscolour-haddock() {
# --hyperlink-source implies calling 'setup hscolour'
set -- haddock --hyperlink-source
echo ./setup "$@"
./setup "$@" --hyperlink-source || die "setup haddock --hyperlink-source failed"
}
cabal-hoogle-haddock() {
set -- haddock --hoogle
echo ./setup "$@"
./setup "$@" || die "setup haddock --hoogle failed"
}
cabal-hoogle-hscolour-haddock() {
cabal-hscolour-haddock
cabal-hoogle-haddock
}
cabal-hoogle-hscolour() {
ewarn "hoogle USE flag requires doc USE flag, building without hoogle"
cabal-hscolour
}
cabal-die-if-nonempty() {
local breakage_type=$1
shift
[[ "${#@}" == 0 ]] && return 0
eerror "Detected ${breakage_type} packages: ${@}"
die "//==-- Please, run 'haskell-updater' to fix ${breakage_type} packages --==//"
}
cabal-show-brokens() {
elog "ghc-pkg check: 'checking for other broken packages:'"
# pretty-printer
$(ghc-getghcpkg) check 2>&1 \
| egrep -v '^Warning: haddock-(html|interfaces): ' \
| egrep -v '^Warning: include-dirs: ' \
| head -n 20
cabal-die-if-nonempty 'broken' \
$($(ghc-getghcpkg) check --simple-output)
}
cabal-show-old() {
cabal-die-if-nonempty 'outdated' \
$("${EPREFIX}"/usr/sbin/haskell-updater --quiet --upgrade --list-only)
}
cabal-show-brokens-and-die() {
cabal-show-brokens
cabal-show-old
die "$@"
}
cabal-configure() {
local cabalconf=()
has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
# We use the bundled with GHC version if exists
# Haddock is very picky about index files
# it generates for ghc's base and other packages.
local p=${EPREFIX}/usr/bin/haddock-ghc-$(ghc-version)
if [[ -f $p ]]; then
cabalconf+=(--with-haddock="${p}")
else
cabalconf+=(--with-haddock=${EPREFIX}/usr/bin/haddock)
fi
fi
if [[ -n "${CABAL_USE_PROFILE}" ]] && use profile; then
cabalconf+=(--enable-library-profiling)
fi
if [[ -n "${CABAL_TEST_SUITE}" ]]; then
cabalconf+=($(use_enable test tests))
fi
if [[ -n "${CABAL_GHC_CONSTRAINT}" ]]; then
cabalconf+=($(cabal-constraint "ghc"))
fi
cabalconf+=(--ghc-options="$(ghc-make-args)")
local option
for option in ${HCFLAGS}
do
cabalconf+=(--ghc-option="$option")
done
# toolchain
cabalconf+=(--with-ar="$(tc-getAR)")
# Building GHCi libs on ppc64 causes "TOC overflow".
if use ppc64; then
cabalconf+=(--disable-library-for-ghci)
fi
# currently cabal does not respect CFLAGS and LDFLAGS on it's own (bug #333217)
# so translate LDFLAGS to ghc parameters (without filtering)
local flag
for flag in $CFLAGS; do cabalconf+=(--ghc-option="-optc$flag"); done
for flag in $LDFLAGS; do cabalconf+=(--ghc-option="-optl$flag"); done
# disable executable stripping for the executables, as portage will
# strip by itself, and pre-stripping gives a QA warning.
# cabal versions previous to 1.4 does not strip executables, and does
# not accept the flag.
# this fixes numerous bugs, amongst them;
# bug #251881, bug #251882, bug #251884, bug #251886, bug #299494
cabalconf+=(--disable-executable-stripping)
cabalconf+=(--docdir="${EPREFIX}"/usr/share/doc/${PF})
# As of Cabal 1.2, configure is quite quiet. For diagnostic purposes
# it's better if the configure chatter is in the build logs:
cabalconf+=(--verbose)
# We build shared version of our Cabal where ghc ships it's shared
# version of it. We will link ./setup as dynamic binary againt Cabal later.
[[ ${CATEGORY}/${PN} == "dev-haskell/cabal" ]] && \
$(ghc-supports-shared-libraries) && \
cabalconf+=(--enable-shared)
if $(ghc-supports-shared-libraries); then
# Experimental support for dynamically linked binaries.
# We are enabling it since 7.10.1_rc3
if ver_test "$(ghc-version)" -ge "7.10.0.20150316"; then
# we didn't enable it before as it was not stable on all arches
cabalconf+=(--enable-shared)
# Known to break on ghc-7.8/Cabal-1.18
# https://ghc.haskell.org/trac/ghc/ticket/9625
cabalconf+=(--enable-executable-dynamic)
fi
fi
# --sysconfdir appeared in Cabal-1.18+
if ./setup configure --help | grep -q -- --sysconfdir; then
cabalconf+=(--sysconfdir="${EPREFIX}"/etc)
fi
# appeared in Cabal-1.18+ (see '--disable-executable-stripping')
if ./setup configure --help | grep -q -- --disable-library-stripping; then
cabalconf+=(--disable-library-stripping)
fi
set -- configure \
--ghc --prefix="${EPREFIX}"/usr \
--with-compiler="$(ghc-getghc)" \
--with-hc-pkg="$(ghc-getghcpkg)" \
--prefix="${EPREFIX}"/usr \
--libdir="${EPREFIX}"/usr/$(get_libdir) \
--libsubdir=${P}/ghc-$(ghc-version) \
--datadir="${EPREFIX}"/usr/share/ \
--datasubdir=${P}/ghc-$(ghc-version) \
"${cabalconf[@]}" \
${CABAL_CONFIGURE_FLAGS} \
${CABAL_EXTRA_CONFIGURE_FLAGS} \
"$@"
echo ./setup "$@"
./setup "$@" || cabal-show-brokens-and-die "setup configure failed"
}
cabal-build() {
set -- build ${CABAL_EXTRA_BUILD_FLAGS} "$@"
echo ./setup "$@"
./setup "$@" \
|| die "setup build failed"
}
cabal-copy() {
has "${EAPI:-0}" 0 1 2 && ! use prefix && ED=${D}
set -- copy --destdir="${D}" "$@"
echo ./setup "$@"
./setup "$@" || die "setup copy failed"
# cabal is a bit eager about creating dirs,
# so remove them if they are empty
rmdir "${ED}/usr/bin" 2> /dev/null
}
cabal-pkg() {
# This does not actually register since we're using true instead
# of ghc-pkg. So it just leaves the .conf file and we can
# register that ourselves (if it exists).
if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
# Newer cabal can generate a package conf for us:
./setup register --gen-pkg-config="${T}/${P}.conf"
if [[ -d "${T}/${P}.conf" ]]; then
ghc-install-pkg "${T}/${P}.conf"/*
else
ghc-install-pkg "${T}/${P}.conf"
fi
fi
}
# Some cabal libs are bundled along with some versions of ghc
# eg filepath-1.0 comes with ghc-6.6.1
# by putting CABAL_CORE_LIB_GHC_PV="6.6.1" in an ebuild we are declaring that
# when building with this version of ghc, the ebuild is a dummy that is it will
# install no files since the package is already included with ghc.
# However portage still records the dependency and we can upgrade the package
# to a later one that's not included with ghc.
# You can also put a space separated list, eg CABAL_CORE_LIB_GHC_PV="6.6 6.6.1".
# Those versions are taken as-is from ghc `--numeric-version`.
# Package manager versions are also supported:
# CABAL_CORE_LIB_GHC_PV="7.10.* PM:7.8.4-r1".
cabal-is-dummy-lib() {
local bin_ghc_version=$(ghc-version)
local pm_ghc_version=$(ghc-pm-version)
for version in ${CABAL_CORE_LIB_GHC_PV}; do
[[ "${bin_ghc_version}" == ${version} ]] && return 0
[[ "${pm_ghc_version}" == ${version} ]] && return 0
done
return 1
}
# exported function: check if cabal is correctly installed for
# the currently active ghc (we cannot guarantee this with portage)
haskell-cabal_pkg_setup() {
if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
[[ ${RDEPEND} == *dev-lang/ghc* ]] || eqawarn "QA Notice: A library does not have runtime dependency on dev-lang/ghc."
fi
if [[ -n "${CABAL_UNKNOWN}" ]]; then
eqawarn "QA Notice: Unknown entry in CABAL_FEATURES: ${CABAL_UNKNOWN}"
fi
if cabal-is-dummy-lib; then
einfo "${P} is included in ghc-${CABAL_CORE_LIB_GHC_PV}, nothing to install."
fi
}
haskell-cabal_src_configure() {
cabal-is-dummy-lib && return
pushd "${S}" > /dev/null || die
cabal-bootstrap
cabal-configure "$@"
popd > /dev/null || die
}
# exported function: nice alias
cabal_src_configure() {
haskell-cabal_src_configure "$@"
}
# exported function: cabal-style bootstrap configure and compile
cabal_src_compile() {
# it's a common mistake when one bumps ebuild to EAPI="2" (and upper)
# and forgets to separate src_compile() to src_configure()/src_compile().
# Such error leads to default src_configure and we lose all passed flags.
if ! has "${EAPI:-0}" 0 1; then
local passed_flag
for passed_flag in "$@"; do
[[ ${passed_flag} == --flags=* ]] && \
eqawarn "QA Notice: Cabal option '${passed_flag}' has effect only in src_configure()"
done
fi
cabal-is-dummy-lib && return
has src_configure ${HASKELL_CABAL_EXPF} || haskell-cabal_src_configure "$@"
cabal-build
if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
if [[ -n "${CABAL_USE_HSCOLOUR}" ]] && use hscolour; then
if [[ -n "${CABAL_USE_HOOGLE}" ]] && use hoogle; then
# hoogle, hscolour and haddock
cabal-hoogle-hscolour-haddock
else
# haddock and hscolour
cabal-hscolour-haddock
fi
else
if [[ -n "${CABAL_USE_HOOGLE}" ]] && use hoogle; then
# hoogle and haddock
cabal-hoogle-haddock
else
# just haddock
cabal-haddock
fi
fi
else
if [[ -n "${CABAL_USE_HSCOLOUR}" ]] && use hscolour; then
if [[ -n "${CABAL_USE_HOOGLE}" ]] && use hoogle; then
# hoogle and hscolour
cabal-hoogle-hscolour
else
# just hscolour
cabal-hscolour
fi
else
if [[ -n "${CABAL_USE_HOOGLE}" ]] && use hoogle; then
# just hoogle
cabal-hoogle
fi
fi
fi
}
haskell-cabal_src_compile() {
pushd "${S}" > /dev/null || die
cabal_src_compile "$@"
popd > /dev/null || die
}
haskell-cabal_src_test() {
local cabaltest=()
pushd "${S}" > /dev/null || die
if cabal-is-dummy-lib; then
einfo ">>> No tests for dummy library: ${CATEGORY}/${PF}"
else
einfo ">>> Test phase [cabal test]: ${CATEGORY}/${PF}"
# '--show-details=streaming' appeared in Cabal-1.20
if ./setup test --help | grep -q -- "'streaming'"; then
cabaltest+=(--show-details=streaming)
fi
set -- test \
"${cabaltest[@]}" \
${CABAL_TEST_FLAGS} \
${CABAL_EXTRA_TEST_FLAGS} \
"$@"
echo ./setup "$@"
./setup "$@" || die "cabal test failed"
fi
popd > /dev/null || die
}
# exported function: cabal-style copy and register
cabal_src_install() {
has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
if ! cabal-is-dummy-lib; then
cabal-copy
cabal-pkg
fi
# create a dummy local package conf file for haskell-updater
# if it does not exist (dummy libraries and binaries w/o libraries)
local ghc_confdir_with_prefix="$(ghc-confdir)"
# remove EPREFIX
dodir ${ghc_confdir_with_prefix#${EPREFIX}}
local hint_db="${D}/$(ghc-confdir)"
local hint_file="${hint_db}/gentoo-empty-${CATEGORY}-${PF}.conf"
mkdir -p "${hint_db}" || die
touch "${hint_file}" || die
}
haskell-cabal_src_install() {
pushd "${S}" > /dev/null || die
cabal_src_install
popd > /dev/null || die
}
haskell-cabal_pkg_postinst() {
ghc-package_pkg_postinst
}
haskell-cabal_pkg_postrm() {
ghc-package_pkg_postrm
}
# @FUNCTION: cabal_flag
# @DESCRIPTION:
# ebuild.sh:use_enable() taken as base
#
# Usage examples:
#
# CABAL_CONFIGURE_FLAGS=$(cabal_flag gui)
# leads to "--flags=gui" or "--flags=-gui" (useflag 'gui')
#
# CABAL_CONFIGURE_FLAGS=$(cabal_flag gtk gui)
# also leads to "--flags=gui" or " --flags=-gui" (useflag 'gtk')
#
cabal_flag() {
if [[ -z "$1" ]]; then
echo "!!! cabal_flag() called without a parameter." >&2
echo "!!! cabal_flag() <USEFLAG> [<cabal_flagname>]" >&2
return 1
fi
local UWORD=${2:-$1}
if use "$1"; then
echo "--flags=${UWORD}"
else
echo "--flags=-${UWORD}"
fi
return 0
}
# @FUNCTION: cabal_chdeps
# @DESCRIPTION:
# Allows easier patching of $CABAL_FILE (${S}/${PN}.cabal by default)
# depends
#
# Accepts argument list as pairs of substitutions: <from-string> <to-string>...
#
# Dies on error.
#
# Usage examples:
#
# src_prepare() {
# cabal_chdeps \
# 'base >= 4.2 && < 4.6' 'base >= 4.2 && < 4.7' \
# 'containers ==0.4.*' 'containers >= 0.4 && < 0.6'
#}
# or
# src_prepare() {
# CABAL_FILE=${S}/${MY_PN}.cabal cabal_chdeps \
# 'base >= 4.2 && < 4.6' 'base >= 4.2 && < 4.7'
# CABAL_FILE=${S}/${MY_PN}-tools.cabal cabal_chdeps \
# 'base == 3.*' 'base >= 4.2 && < 4.7'
#}
#
cabal_chdeps() {
local cabal_fn=${MY_PN:-${PN}}.cabal
local cf=${CABAL_FILE:-${S}/${cabal_fn}}
local from_ss # ss - substring
local to_ss
local orig_c # c - contents
local new_c
[[ -f $cf ]] || die "cabal file '$cf' does not exist"
orig_c=$(< "$cf")
while :; do
from_pat=$1
to_str=$2
[[ -n ${from_pat} ]] || break
[[ -n ${to_str} ]] || die "'${from_str}' does not have 'to' part"
einfo "CHDEP: '${from_pat}' -> '${to_str}'"
# escape pattern-like symbols
from_pat=${from_pat//\*/\\*}
from_pat=${from_pat//\[/\\[}
new_c=${orig_c//${from_pat}/${to_str}}
if [[ -n $CABAL_DEBUG_LOOSENING ]]; then
echo "${orig_c}" >"${T}/${cf}".pre
echo "${new_c}" >"${T}/${cf}".post
diff -u "${T}/${cf}".{pre,post}
fi
[[ "${orig_c}" == "${new_c}" ]] && die "no trigger for '${from_pat}'"
orig_c=${new_c}
shift
shift
done
echo "${new_c}" > "$cf" ||
die "failed to update"
}
# @FUNCTION: cabal-constraint
# @DESCRIPTION:
# Allowes to set contraint to the libraries that are
# used by specified package
cabal-constraint() {
while read p v ; do
echo "--constraint \"$p == $v\""
done < $(ghc-pkgdeps ${1})
}
# @FUNCTION: replace-hcflags
# @USAGE: <old> <new>
# @DESCRIPTION:
# Replace the <old> flag with <new> in HCFLAGS. Accepts shell globs for <old>.
# The implementation is picked from flag-o-matic.eclass:replace-flags()
replace-hcflags() {
[[ $# != 2 ]] && die "Usage: replace-hcflags <old flag> <new flag>"
local f new=()
for f in ${HCFLAGS} ; do
# Note this should work with globs like -O*
if [[ ${f} == ${1} ]]; then
einfo "HCFLAGS: replacing '${f}' to '${2}'"
f=${2}
fi
new+=( "${f}" )
done
export HCFLAGS="${new[*]}"
return 0
}