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Revision 1.44 - (show annotations) (download)
Thu May 22 16:35:11 2014 UTC (7 months ago) by slyfox
Branch: MAIN
Changes since 1.43: +17 -15 lines
cabal_chdeps() now defaults to MY_PN (autogenerated by hackport) if exists, then to PN

1 # Copyright 1999-2014 Gentoo Foundation
2 # Distributed under the terms of the GNU General Public License v2
3 # $Header: /var/cvsroot/gentoo-x86/eclass/haskell-cabal.eclass,v 1.43 2014/02/11 19:00:06 slyfox Exp $
4
5 # @ECLASS: haskell-cabal.eclass
6 # @MAINTAINER:
7 # Haskell herd <haskell@gentoo.org>
8 # @AUTHOR:
9 # Original author: Andres Loeh <kosmikus@gentoo.org>
10 # Original author: Duncan Coutts <dcoutts@gentoo.org>
11 # @BLURB: for packages that make use of the Haskell Common Architecture for Building Applications and Libraries (cabal)
12 # @DESCRIPTION:
13 # Basic instructions:
14 #
15 # Before inheriting the eclass, set CABAL_FEATURES to
16 # reflect the tools and features that the package makes
17 # use of.
18 #
19 # Currently supported features:
20 # haddock -- for documentation generation
21 # hscolour -- generation of colourised sources
22 # hoogle -- generation of documentation search index
23 # alex -- lexer/scanner generator
24 # happy -- parser generator
25 # c2hs -- C interface generator
26 # cpphs -- C preprocessor clone written in Haskell
27 # profile -- if package supports to build profiling-enabled libraries
28 # bootstrap -- only used for the cabal package itself
29 # bin -- the package installs binaries
30 # lib -- the package installs libraries
31 # nocabaldep -- don't add dependency on cabal.
32 # only used for packages that _must_ not pull the dependency
33 # on cabal, but still use this eclass (e.g. haskell-updater).
34 # test-suite -- add support for cabal test-suites (introduced in Cabal-1.8)
35
36 inherit eutils ghc-package multilib multiprocessing
37
38 # @ECLASS-VARIABLE: CABAL_EXTRA_CONFIGURE_FLAGS
39 # @DESCRIPTION:
40 # User-specified additional parameters passed to 'setup configure'.
41 # example: /etc/portage/make.conf: CABAL_EXTRA_CONFIGURE_FLAGS=--enable-shared
42 : ${CABAL_EXTRA_CONFIGURE_FLAGS:=}
43
44 # @ECLASS-VARIABLE: CABAL_EXTRA_BUILD_FLAGS
45 # @DESCRIPTION:
46 # User-specified additional parameters passed to 'setup build'.
47 # example: /etc/portage/make.conf: CABAL_EXTRA_BUILD_FLAGS=-v
48 : ${CABAL_EXTRA_BUILD_FLAGS:=}
49
50 # @ECLASS-VARIABLE: GHC_BOOTSTRAP_FLAGS
51 # @DESCRIPTION:
52 # User-specified additional parameters for ghc when building
53 # _only_ 'setup' binary bootstrap.
54 # example: /etc/portage/make.conf: GHC_BOOTSTRAP_FLAGS=-dynamic to make
55 # linking 'setup' faster.
56 : ${GHC_BOOTSTRAP_FLAGS:=}
57
58 # @ECLASS-VARIABLE: CABAL_DEBUG_LOOSENING
59 # @DESCRIPTION:
60 # Show debug output for 'cabal_chdeps' function if set.
61 # Needs working 'diff'.
62 : ${CABAL_DEBUG_LOOSENING:=}
63
64 HASKELL_CABAL_EXPF="pkg_setup src_compile src_test src_install"
65
66 case "${EAPI:-0}" in
67 2|3|4|5) HASKELL_CABAL_EXPF+=" src_configure" ;;
68 *) ;;
69 esac
70
71 EXPORT_FUNCTIONS ${HASKELL_CABAL_EXPF}
72
73 for feature in ${CABAL_FEATURES}; do
74 case ${feature} in
75 haddock) CABAL_USE_HADDOCK=yes;;
76 hscolour) CABAL_USE_HSCOLOUR=yes;;
77 hoogle) CABAL_USE_HOOGLE=yes;;
78 alex) CABAL_USE_ALEX=yes;;
79 happy) CABAL_USE_HAPPY=yes;;
80 c2hs) CABAL_USE_C2HS=yes;;
81 cpphs) CABAL_USE_CPPHS=yes;;
82 profile) CABAL_USE_PROFILE=yes;;
83 bootstrap) CABAL_BOOTSTRAP=yes;;
84 bin) CABAL_HAS_BINARIES=yes;;
85 lib) CABAL_HAS_LIBRARIES=yes;;
86 nocabaldep) CABAL_FROM_GHC=yes;;
87 test-suite) CABAL_TEST_SUITE=yes;;
88 *) CABAL_UNKNOWN="${CABAL_UNKNOWN} ${feature}";;
89 esac
90 done
91
92 if [[ -n "${CABAL_USE_HADDOCK}" ]]; then
93 IUSE="${IUSE} doc"
94 # don't require depend on itself to build docs.
95 # ebuild bootstraps docs from just built binary
96 [[ ${CATEGORY}/${PN} = "dev-haskell/haddock" ]] || DEPEND="${DEPEND} doc? ( dev-haskell/haddock )"
97 fi
98
99 if [[ -n "${CABAL_USE_HSCOLOUR}" ]]; then
100 IUSE="${IUSE} hscolour"
101 DEPEND="${DEPEND} hscolour? ( dev-haskell/hscolour )"
102 fi
103
104 if [[ -n "${CABAL_USE_ALEX}" ]]; then
105 DEPEND="${DEPEND} dev-haskell/alex"
106 fi
107
108 if [[ -n "${CABAL_USE_HAPPY}" ]]; then
109 DEPEND="${DEPEND} dev-haskell/happy"
110 fi
111
112 if [[ -n "${CABAL_USE_C2HS}" ]]; then
113 DEPEND="${DEPEND} dev-haskell/c2hs"
114 fi
115
116 if [[ -n "${CABAL_USE_CPPHS}" ]]; then
117 DEPEND="${DEPEND} dev-haskell/cpphs"
118 fi
119
120 if [[ -n "${CABAL_USE_PROFILE}" ]]; then
121 IUSE="${IUSE} profile"
122 fi
123
124 if [[ -n "${CABAL_TEST_SUITE}" ]]; then
125 IUSE="${IUSE} test"
126 fi
127
128 # We always use a standalone version of Cabal, rather than the one that comes
129 # with GHC. But of course we can't depend on cabal when building cabal itself.
130 if [[ -z ${CABAL_MIN_VERSION} ]]; then
131 CABAL_MIN_VERSION=1.1.4
132 fi
133 if [[ -z "${CABAL_BOOTSTRAP}" && -z "${CABAL_FROM_GHC}" ]]; then
134 DEPEND="${DEPEND} >=dev-haskell/cabal-${CABAL_MIN_VERSION}"
135 fi
136
137 # returns the version of cabal currently in use
138 _CABAL_VERSION_CACHE=""
139 cabal-version() {
140 if [[ -z "${_CABAL_VERSION_CACHE}" ]]; then
141 if [[ "${CABAL_BOOTSTRAP}" ]]; then
142 # We're bootstrapping cabal, so the cabal version is the version
143 # of this package itself.
144 _CABAL_VERSION_CACHE="${PV}"
145 elif [[ "${CABAL_FROM_GHC}" ]]; then
146 local cabal_package=$(echo "$(ghc-libdir)"/Cabal-*)
147 # /path/to/ghc/Cabal-${VER} -> ${VER}
148 _CABAL_VERSION_CACHE="${cabal_package/*Cabal-/}"
149 else
150 # We ask portage, not ghc, so that we only pick up
151 # portage-installed cabal versions.
152 _CABAL_VERSION_CACHE="$(ghc-extractportageversion dev-haskell/cabal)"
153 fi
154 fi
155 echo "${_CABAL_VERSION_CACHE}"
156 }
157
158 cabal-bootstrap() {
159 local setupmodule
160 local cabalpackage
161 if [[ -f "${S}/Setup.lhs" ]]; then
162 setupmodule="${S}/Setup.lhs"
163 elif [[ -f "${S}/Setup.hs" ]]; then
164 setupmodule="${S}/Setup.hs"
165 else
166 die "No Setup.lhs or Setup.hs found"
167 fi
168
169 if [[ -z "${CABAL_BOOTSTRAP}" && -z "${CABAL_FROM_GHC}" ]] && ! ghc-sanecabal "${CABAL_MIN_VERSION}"; then
170 eerror "The package dev-haskell/cabal is not correctly installed for"
171 eerror "the currently active version of ghc ($(ghc-version)). Please"
172 eerror "run haskell-updater or re-build dev-haskell/cabal."
173 die "cabal is not correctly installed"
174 fi
175
176 # We build the setup program using the latest version of
177 # cabal that we have installed
178 cabalpackage=Cabal-$(cabal-version)
179 einfo "Using cabal-$(cabal-version)."
180
181 make_setup() {
182 set -- -package "${cabalpackage}" --make "${setupmodule}" \
183 ${HCFLAGS} \
184 ${GHC_BOOTSTRAP_FLAGS} \
185 "$@" \
186 -o setup
187 echo $(ghc-getghc) "$@"
188 $(ghc-getghc) "$@"
189 }
190 if $(ghc-supports-shared-libraries); then
191 # # some custom build systems might use external libraries,
192 # # for which we don't have shared libs, so keep static fallback
193 # bug #411789, http://hackage.haskell.org/trac/ghc/ticket/5743#comment:3
194 # http://hackage.haskell.org/trac/ghc/ticket/7062
195 # http://hackage.haskell.org/trac/ghc/ticket/3072
196 # ghc does not set RPATH for extralibs, thus we do it ourselves by hands
197 einfo "Prepending $(ghc-libdir) to LD_LIBRARY_PATH"
198 if [[ ${CHOST} != *-darwin* ]]; then
199 LD_LIBRARY_PATH="$(ghc-libdir)${LD_LIBRARY_PATH:+:}${LD_LIBRARY_PATH}"
200 export LD_LIBRARY_PATH
201 else
202 DYLD_LIBRARY_PATH="$(ghc-libdir)${DYLD_LIBRARY_PATH:+:}${DYLD_LIBRARY_PATH}"
203 export DYLD_LIBRARY_PATH
204 fi
205 { make_setup -dynamic "$@" && ./setup --help >/dev/null; } ||
206 make_setup "$@" || die "compiling ${setupmodule} failed"
207 else
208 make_setup "$@" || die "compiling ${setupmodule} failed"
209 fi
210 }
211
212 cabal-mksetup() {
213 local setupdir=${1:-${S}}
214 local setup_src=${setupdir}/Setup.hs
215
216 rm -vf "${setupdir}"/Setup.{lhs,hs}
217 elog "Creating 'Setup.hs' for 'Simple' build type."
218
219 echo 'import Distribution.Simple; main = defaultMainWithHooks defaultUserHooks' \
220 > "${setup_src}" || die "failed to create default Setup.hs"
221 }
222
223 cabal-hscolour() {
224 set -- hscolour "$@"
225 echo ./setup "$@"
226 ./setup "$@" || die "setup hscolour failed"
227 }
228
229 cabal-haddock() {
230 set -- haddock "$@"
231 echo ./setup "$@"
232 ./setup "$@" || die "setup haddock failed"
233 }
234
235 cabal-hscolour-haddock() {
236 # --hyperlink-source implies calling 'setup hscolour'
237 set -- haddock --hyperlink-source
238 echo ./setup "$@"
239 ./setup "$@" --hyperlink-source || die "setup haddock --hyperlink-source failed"
240 }
241
242 cabal-die-if-nonempty() {
243 local breakage_type=$1
244 shift
245
246 [[ "${#@}" == 0 ]] && return 0
247 eerror "Detected ${breakage_type} packages: ${@}"
248 die "//==-- Please, run 'haskell-updater' to fix ${breakage_type} packages --==//"
249 }
250
251 cabal-show-brokens() {
252 elog "ghc-pkg check: 'checking for other broken packages:'"
253 # pretty-printer
254 $(ghc-getghcpkg) check 2>&1 \
255 | egrep -v '^Warning: haddock-(html|interfaces): ' \
256 | egrep -v '^Warning: include-dirs: ' \
257 | head -n 20
258
259 cabal-die-if-nonempty 'broken' \
260 $($(ghc-getghcpkg) check --simple-output)
261 }
262
263 cabal-show-old() {
264 cabal-die-if-nonempty 'outdated' \
265 $("${EPREFIX}"/usr/sbin/haskell-updater --quiet --upgrade --list-only)
266 }
267
268 cabal-show-brokens-and-die() {
269 cabal-show-brokens
270 cabal-show-old
271
272 die "$@"
273 }
274
275 cabal-configure() {
276 local cabalconf=()
277 has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
278
279 if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
280 cabalconf+=(--with-haddock=${EPREFIX}/usr/bin/haddock)
281 fi
282 if [[ -n "${CABAL_USE_PROFILE}" ]] && use profile; then
283 cabalconf+=(--enable-library-profiling)
284 fi
285 if [[ -n "${CABAL_USE_ALEX}" ]]; then
286 cabalconf+=(--with-alex=${EPREFIX}/usr/bin/alex)
287 fi
288
289 if [[ -n "${CABAL_USE_HAPPY}" ]]; then
290 cabalconf+=(--with-happy=${EPREFIX}/usr/bin/happy)
291 fi
292
293 if [[ -n "${CABAL_USE_C2HS}" ]]; then
294 cabalconf+=(--with-c2hs=${EPREFIX}/usr/bin/c2hs)
295 fi
296 if [[ -n "${CABAL_USE_CPPHS}" ]]; then
297 cabalconf+=(--with-cpphs=${EPREFIX}/usr/bin/cpphs)
298 fi
299 if [[ -n "${CABAL_TEST_SUITE}" ]]; then
300 cabalconf+=($(use_enable test tests))
301 fi
302
303 local option
304 for option in ${HCFLAGS}
305 do
306 cabalconf+=(--ghc-option="$option")
307 done
308
309 # parallel on all available cores
310 if ghc-supports-parallel-make; then
311 local max_jobs=$(makeopts_jobs)
312
313 # limit to very small value, as parallelism
314 # helps slightly, but makes things severely worse
315 # when amount of threads is Very Large.
316 [[ ${max_jobs} -gt 4 ]] && max_jobs=4
317
318 cabalconf+=(--ghc-option=-j"$max_jobs")
319 fi
320
321 # Building GHCi libs on ppc64 causes "TOC overflow".
322 if use ppc64; then
323 cabalconf+=(--disable-library-for-ghci)
324 fi
325
326 # currently cabal does not respect CFLAGS and LDFLAGS on it's own (bug #333217)
327 # so translate LDFLAGS to ghc parameters (without filtering)
328 local flag
329 for flag in $LDFLAGS; do cabalconf+=(--ghc-option="-optl$flag"); done
330
331 # disable executable stripping for the executables, as portage will
332 # strip by itself, and pre-stripping gives a QA warning.
333 # cabal versions previous to 1.4 does not strip executables, and does
334 # not accept the flag.
335 # this fixes numerous bugs, amongst them;
336 # bug #251881, bug #251882, bug #251884, bug #251886, bug #299494
337 cabalconf+=(--disable-executable-stripping)
338
339 cabalconf+=(--docdir="${EPREFIX}"/usr/share/doc/${PF})
340 # As of Cabal 1.2, configure is quite quiet. For diagnostic purposes
341 # it's better if the configure chatter is in the build logs:
342 cabalconf+=(--verbose)
343
344 # We build shared version of our Cabal where ghc ships it's shared
345 # version of it. We will link ./setup as dynamic binary againt Cabal later.
346 [[ ${CATEGORY}/${PN} == "dev-haskell/cabal" ]] && \
347 $(ghc-supports-shared-libraries) && \
348 cabalconf+=(--enable-shared)
349
350 if $(ghc-supports-shared-libraries); then
351 # maybe a bit lower
352 if $(ghc-supports-dynamic-by-default); then
353 cabalconf+=(--enable-shared)
354 fi
355 fi
356
357 # --sysconfdir appeared in Cabal-1.18+
358 if ./setup configure --help | grep -q -- --sysconfdir; then
359 cabalconf+=(--sysconfdir="${EPREFIX}"/etc)
360 fi
361
362 # appeared in Cabal-1.18+ (see '--disable-executable-stripping')
363 if ./setup configure --help | grep -q -- --disable-library-stripping; then
364 cabalconf+=(--disable-library-stripping)
365 fi
366
367 set -- configure \
368 --ghc --prefix="${EPREFIX}"/usr \
369 --with-compiler="$(ghc-getghc)" \
370 --with-hc-pkg="$(ghc-getghcpkg)" \
371 --prefix="${EPREFIX}"/usr \
372 --libdir="${EPREFIX}"/usr/$(get_libdir) \
373 --libsubdir=${P}/ghc-$(ghc-version) \
374 --datadir="${EPREFIX}"/usr/share/ \
375 --datasubdir=${P}/ghc-$(ghc-version) \
376 "${cabalconf[@]}" \
377 ${CABAL_CONFIGURE_FLAGS} \
378 ${CABAL_EXTRA_CONFIGURE_FLAGS} \
379 "$@"
380 echo ./setup "$@"
381 ./setup "$@" || cabal-show-brokens-and-die "setup configure failed"
382 }
383
384 cabal-build() {
385 unset LANG LC_ALL LC_MESSAGES
386 set -- build ${CABAL_EXTRA_BUILD_FLAGS} "$@"
387 echo ./setup "$@"
388 ./setup "$@" \
389 || die "setup build failed"
390 }
391
392 cabal-copy() {
393 has "${EAPI:-0}" 0 1 2 && ! use prefix && ED=${D}
394
395 set -- copy --destdir="${D}" "$@"
396 echo ./setup "$@"
397 ./setup "$@" || die "setup copy failed"
398
399 # cabal is a bit eager about creating dirs,
400 # so remove them if they are empty
401 rmdir "${ED}/usr/bin" 2> /dev/null
402 }
403
404 cabal-pkg() {
405 # This does not actually register since we're using true instead
406 # of ghc-pkg. So it just leaves the .conf file and we can
407 # register that ourselves (if it exists).
408
409 if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
410 # Newer cabal can generate a package conf for us:
411 ./setup register --gen-pkg-config="${T}/${P}.conf"
412 ghc-setup-pkg "${T}/${P}.conf"
413 ghc-install-pkg
414 fi
415 }
416
417 # Some cabal libs are bundled along with some versions of ghc
418 # eg filepath-1.0 comes with ghc-6.6.1
419 # by putting CABAL_CORE_LIB_GHC_PV="6.6.1" in an ebuild we are declaring that
420 # when building with this version of ghc, the ebuild is a dummy that is it will
421 # install no files since the package is already included with ghc.
422 # However portage still records the dependency and we can upgrade the package
423 # to a later one that's not included with ghc.
424 # You can also put a space separated list, eg CABAL_CORE_LIB_GHC_PV="6.6 6.6.1".
425 cabal-is-dummy-lib() {
426 for version in ${CABAL_CORE_LIB_GHC_PV[*]}; do
427 [[ "$(ghc-version)" == ${version} ]] && return 0
428 done
429 return 1
430 }
431
432 # exported function: check if cabal is correctly installed for
433 # the currently active ghc (we cannot guarantee this with portage)
434 haskell-cabal_pkg_setup() {
435 if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
436 [[ ${RDEPEND} == *dev-lang/ghc* ]] || eqawarn "QA Notice: A library does not have runtime dependency on dev-lang/ghc."
437 fi
438 if [[ -z "${CABAL_HAS_BINARIES}" ]] && [[ -z "${CABAL_HAS_LIBRARIES}" ]]; then
439 eqawarn "QA Notice: Neither bin nor lib are in CABAL_FEATURES."
440 fi
441 if [[ -n "${CABAL_UNKNOWN}" ]]; then
442 eqawarn "QA Notice: Unknown entry in CABAL_FEATURES: ${CABAL_UNKNOWN}"
443 fi
444 if cabal-is-dummy-lib; then
445 einfo "${P} is included in ghc-${CABAL_CORE_LIB_GHC_PV}, nothing to install."
446 fi
447 }
448
449 haskell-cabal_src_configure() {
450 cabal-is-dummy-lib && return
451
452 pushd "${S}" > /dev/null
453
454 cabal-bootstrap
455
456 cabal-configure "$@"
457
458 popd > /dev/null
459 }
460
461 # exported function: nice alias
462 cabal_src_configure() {
463 haskell-cabal_src_configure "$@"
464 }
465
466 # exported function: cabal-style bootstrap configure and compile
467 cabal_src_compile() {
468 # it's a common mistake when one bumps ebuild to EAPI="2" (and upper)
469 # and forgets to separate src_compile() to src_configure()/src_compile().
470 # Such error leads to default src_configure and we lose all passed flags.
471 if ! has "${EAPI:-0}" 0 1; then
472 local passed_flag
473 for passed_flag in "$@"; do
474 [[ ${passed_flag} == --flags=* ]] && \
475 eqawarn "QA Notice: Cabal option '${passed_flag}' has effect only in src_configure()"
476 done
477 fi
478
479 cabal-is-dummy-lib && return
480
481 has src_configure ${HASKELL_CABAL_EXPF} || haskell-cabal_src_configure "$@"
482 cabal-build
483
484 if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
485 if [[ -n "${CABAL_USE_HSCOLOUR}" ]] && use hscolour; then
486 # hscolour and haddock
487 cabal-hscolour-haddock
488 else
489 # just haddock
490 cabal-haddock
491 fi
492 else
493 if [[ -n "${CABAL_USE_HSCOLOUR}" ]] && use hscolour; then
494 # just hscolour
495 cabal-hscolour
496 fi
497 fi
498 }
499
500 haskell-cabal_src_compile() {
501 pushd "${S}" > /dev/null
502
503 cabal_src_compile "$@"
504
505 popd > /dev/null
506 }
507
508 haskell-cabal_src_test() {
509 pushd "${S}" > /dev/null
510
511 if cabal-is-dummy-lib; then
512 einfo ">>> No tests for dummy library: ${CATEGORY}/${PF}"
513 else
514 einfo ">>> Test phase [cabal test]: ${CATEGORY}/${PF}"
515 set -- test "$@"
516 echo ./setup "$@"
517 ./setup "$@" || die "cabal test failed"
518 fi
519
520 popd > /dev/null
521 }
522
523 # exported function: cabal-style copy and register
524 cabal_src_install() {
525 has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
526
527 if ! cabal-is-dummy-lib; then
528 cabal-copy
529 cabal-pkg
530 fi
531
532 # create a dummy local package conf file for haskell-updater
533 # if it does not exist (dummy libraries and binaries w/o libraries)
534 local ghc_confdir_with_prefix="$(ghc-confdir)"
535 # remove EPREFIX
536 dodir ${ghc_confdir_with_prefix#${EPREFIX}}
537 local conf_file="${D}/$(ghc-confdir)/$(ghc-localpkgconf)"
538 [[ -e $conf_file ]] || echo '[]' > "$conf_file" || die
539
540 # make sure installed packages do not destroy ghc's
541 # bundled packages
542 local initial_pkg_db=${ROOT}/$(ghc-libdir)/package.conf.d.initial
543 if [[ -e ${initial_pkg_db} ]]; then
544 local checked_pkg
545 for checked_pkg in $(ghc-listpkg "${conf_file}")
546 do
547 local initial_pkg
548 for initial_pkg in $(ghc-listpkg "${initial_pkg_db}"); do
549 if [[ ${checked_pkg} = ${initial_pkg} ]]; then
550 eerror "Package ${checked_pkg} is shipped with $(ghc-version)."
551 eerror "Ebuild author forgot CABAL_CORE_LIB_GHC_PV entry."
552 eerror "Found in ${initial_pkg_db}."
553 die
554 fi
555 done
556 done
557 fi
558 }
559
560 haskell-cabal_src_install() {
561 pushd "${S}" > /dev/null
562
563 cabal_src_install
564
565 popd > /dev/null
566 }
567
568 # @FUNCTION: cabal_flag
569 # @DESCRIPTION:
570 # ebuild.sh:use_enable() taken as base
571 #
572 # Usage examples:
573 #
574 # CABAL_CONFIGURE_FLAGS=$(cabal_flag gui)
575 # leads to "--flags=gui" or "--flags=-gui" (useflag 'gui')
576 #
577 # CABAL_CONFIGURE_FLAGS=$(cabal_flag gtk gui)
578 # also leads to "--flags=gui" or " --flags=-gui" (useflag 'gtk')
579 #
580 cabal_flag() {
581 if [[ -z "$1" ]]; then
582 echo "!!! cabal_flag() called without a parameter." >&2
583 echo "!!! cabal_flag() <USEFLAG> [<cabal_flagname>]" >&2
584 return 1
585 fi
586
587 local UWORD=${2:-$1}
588
589 if use "$1"; then
590 echo "--flags=${UWORD}"
591 else
592 echo "--flags=-${UWORD}"
593 fi
594
595 return 0
596 }
597
598 # @FUNCTION: cabal_chdeps
599 # @DESCRIPTION:
600 # Allows easier patching of $CABAL_FILE (${S}/${PN}.cabal by default)
601 # depends
602 #
603 # Accepts argument list as pairs of substitutions: <from-string> <to-string>...
604 #
605 # Dies on error.
606 #
607 # Usage examples:
608 #
609 # src_prepare() {
610 # cabal_chdeps \
611 # 'base >= 4.2 && < 4.6' 'base >= 4.2 && < 4.7' \
612 # 'containers ==0.4.*' 'containers >= 0.4 && < 0.6'
613 #}
614 # or
615 # src_prepare() {
616 # CABAL_FILE=${S}/${MY_PN}.cabal cabal_chdeps \
617 # 'base >= 4.2 && < 4.6' 'base >= 4.2 && < 4.7'
618 # CABAL_FILE=${S}/${MY_PN}-tools.cabal cabal_chdeps \
619 # 'base == 3.*' 'base >= 4.2 && < 4.7'
620 #}
621 #
622 cabal_chdeps() {
623 local cabal_fn=${MY_PN:-${PN}}.cabal
624 local cf=${CABAL_FILE:-${S}/${cabal_fn}}
625 local from_ss # ss - substring
626 local to_ss
627 local orig_c # c - contents
628 local new_c
629
630 [[ -f $cf ]] || die "cabal file '$cf' does not exist"
631
632 orig_c=$(< "$cf")
633
634 while :; do
635 from_pat=$1
636 to_str=$2
637
638 [[ -n ${from_pat} ]] || break
639 [[ -n ${to_str} ]] || die "'${from_str}' does not have 'to' part"
640
641 einfo "CHDEP: '${from_pat}' -> '${to_str}'"
642
643 # escape pattern-like symbols
644 from_pat=${from_pat//\*/\\*}
645 from_pat=${from_pat//\[/\\[}
646
647 new_c=${orig_c//${from_pat}/${to_str}}
648
649 if [[ -n $CABAL_DEBUG_LOOSENING ]]; then
650 echo "${orig_c}" >"${T}/${cf}".pre
651 echo "${new_c}" >"${T}/${cf}".post
652 diff -u "${T}/${cf}".{pre,post}
653 fi
654
655 [[ "${orig_c}" == "${new_c}" ]] && die "no trigger for '${from_pat}'"
656 orig_c=${new_c}
657 shift
658 shift
659 done
660
661 echo "${new_c}" > "$cf" ||
662 die "failed to update"
663 }
664
665 # @FUNCTION: replace-hcflags
666 # @USAGE: <old> <new>
667 # @DESCRIPTION:
668 # Replace the <old> flag with <new> in HCFLAGS. Accepts shell globs for <old>.
669 # The implementation is picked from flag-o-matic.eclass:replace-flags()
670 replace-hcflags() {
671 [[ $# != 2 ]] && die "Usage: replace-hcflags <old flag> <new flag>"
672
673 local f new=()
674 for f in ${HCFLAGS} ; do
675 # Note this should work with globs like -O*
676 if [[ ${f} == ${1} ]]; then
677 einfo "HCFLAGS: replacing '${f}' to '${2}'"
678 f=${2}
679 fi
680 new+=( "${f}" )
681 done
682 export HCFLAGS="${new[*]}"
683
684 return 0
685 }

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