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Revision 1.40 - (show annotations) (download)
Sat May 11 12:46:32 2013 UTC (18 months, 2 weeks ago) by slyfox
Branch: MAIN
Changes since 1.39: +24 -4 lines
Added 'ghc-supports-smp' and 'ghc-supports-dynamic-by-default' helpers. Added hint for users to run 'haskell-updater' if configure phase failed.

1 # Copyright 1999-2013 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 1.39 2013/04/28 16:15:33 zmedico 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
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 ${GHC_BOOTSTRAP_FLAGS} \
184 "$@" \
185 -o setup
186 echo $(ghc-getghc) ${HCFLAGS} "$@"
187 $(ghc-getghc) "$@"
188 }
189 if $(ghc-supports-shared-libraries); then
190 # # some custom build systems might use external libraries,
191 # # for which we don't have shared libs, so keep static fallback
192 # bug #411789, http://hackage.haskell.org/trac/ghc/ticket/5743#comment:3
193 # http://hackage.haskell.org/trac/ghc/ticket/7062
194 # http://hackage.haskell.org/trac/ghc/ticket/3072
195 # ghc does not set RPATH for extralibs, thus we do it ourselves by hands
196 einfo "Prepending $(ghc-libdir) to LD_LIBRARY_PATH"
197 if [[ ${CHOST} != *-darwin* ]]; then
198 LD_LIBRARY_PATH="$(ghc-libdir)${LD_LIBRARY_PATH:+:}${LD_LIBRARY_PATH}"
199 export LD_LIBRARY_PATH
200 else
201 DYLD_LIBRARY_PATH="$(ghc-libdir)${DYLD_LIBRARY_PATH:+:}${DYLD_LIBRARY_PATH}"
202 export DYLD_LIBRARY_PATH
203 fi
204 { make_setup -dynamic "$@" && ./setup --help >/dev/null; } ||
205 make_setup "$@" || die "compiling ${setupmodule} failed"
206 else
207 make_setup "$@" || die "compiling ${setupmodule} failed"
208 fi
209 }
210
211 cabal-mksetup() {
212 local setupdir
213
214 if [[ -n $1 ]]; then
215 setupdir=$1
216 else
217 setupdir=${S}
218 fi
219
220 rm -f "${setupdir}"/Setup.{lhs,hs}
221
222 echo 'import Distribution.Simple; main = defaultMainWithHooks defaultUserHooks' \
223 > $setupdir/Setup.hs || die "failed to create default Setup.hs"
224 }
225
226 cabal-hscolour() {
227 set -- hscolour "$@"
228 echo ./setup "$@"
229 ./setup "$@" || die "setup hscolour failed"
230 }
231
232 cabal-haddock() {
233 set -- haddock "$@"
234 echo ./setup "$@"
235 ./setup "$@" || die "setup haddock failed"
236 }
237
238 cabal-hscolour-haddock() {
239 # --hyperlink-source implies calling 'setup hscolour'
240 set -- haddock --hyperlink-source
241 echo ./setup "$@"
242 ./setup "$@" --hyperlink-source || die "setup haddock --hyperlink-source failed"
243 }
244
245 cabal-show-brokens() {
246 # pretty-printer
247 $(ghc-getghcpkg) check 2>&1 \
248 | egrep -v '^Warning: haddock-(html|interfaces): ' \
249 | egrep -v '^Warning: include-dirs: '
250
251 set -- $($(ghc-getghcpkg) check --simple-output)
252 [[ "${#@}" == 0 ]] && return 0
253
254 eerror "Detected broken packages: ${@}"
255
256 die "//==-- Please, run 'haskell-updater' to fix broken packages --==//"
257 }
258
259 cabal-show-brokens-and-die() {
260 cabal-show-brokens
261
262 die "$@"
263 }
264
265 cabal-configure() {
266 has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
267
268 if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
269 cabalconf="${cabalconf} --with-haddock=${EPREFIX}/usr/bin/haddock"
270 fi
271 if [[ -n "${CABAL_USE_PROFILE}" ]] && use profile; then
272 cabalconf="${cabalconf} --enable-library-profiling"
273 fi
274 if [[ -n "${CABAL_USE_ALEX}" ]]; then
275 cabalconf="${cabalconf} --with-alex=${EPREFIX}/usr/bin/alex"
276 fi
277
278 if [[ -n "${CABAL_USE_HAPPY}" ]]; then
279 cabalconf="${cabalconf} --with-happy=${EPREFIX}/usr/bin/happy"
280 fi
281
282 if [[ -n "${CABAL_USE_C2HS}" ]]; then
283 cabalconf="${cabalconf} --with-c2hs=${EPREFIX}/usr/bin/c2hs"
284 fi
285 if [[ -n "${CABAL_USE_CPPHS}" ]]; then
286 cabalconf="${cabalconf} --with-cpphs=${EPREFIX}/usr/bin/cpphs"
287 fi
288 if [[ -n "${CABAL_TEST_SUITE}" ]]; then
289 cabalconf="${cabalconf} $(use_enable test tests)"
290 fi
291
292 local option
293 for option in ${HCFLAGS}
294 do
295 cabalconf+=" --ghc-option=$option"
296 done
297
298 # Building GHCi libs on ppc64 causes "TOC overflow".
299 if use ppc64; then
300 cabalconf="${cabalconf} --disable-library-for-ghci"
301 fi
302
303 # currently cabal does not respect CFLAGS and LDFLAGS on it's own (bug #333217)
304 # so translate LDFLAGS to ghc parameters (without filtering)
305 local flag
306 for flag in $LDFLAGS; do cabalconf="${cabalconf} --ghc-option=-optl$flag"; done
307
308 # disable executable stripping for the executables, as portage will
309 # strip by itself, and pre-stripping gives a QA warning.
310 # cabal versions previous to 1.4 does not strip executables, and does
311 # not accept the flag.
312 # this fixes numerous bugs, amongst them;
313 # bug #251881, bug #251882, bug #251884, bug #251886, bug #299494
314 cabalconf="${cabalconf} --disable-executable-stripping"
315
316 cabalconf="${cabalconf} --docdir=${EPREFIX}/usr/share/doc/${PF}"
317 # As of Cabal 1.2, configure is quite quiet. For diagnostic purposes
318 # it's better if the configure chatter is in the build logs:
319 cabalconf="${cabalconf} --verbose"
320
321 # We build shared version of our Cabal where ghc ships it's shared
322 # version of it. We will link ./setup as dynamic binary againt Cabal later.
323 [[ ${CATEGORY}/${PN} == "dev-haskell/cabal" ]] && \
324 $(ghc-supports-shared-libraries) && \
325 cabalconf="${cabalconf} --enable-shared"
326
327 if $(ghc-supports-shared-libraries); then
328 # maybe a bit lower
329 if $(ghc-supports-dynamic-by-default); then
330 cabalconf="${cabalconf} --enable-shared"
331 fi
332 fi
333
334 set -- configure \
335 --ghc --prefix="${EPREFIX}"/usr \
336 --with-compiler="$(ghc-getghc)" \
337 --with-hc-pkg="$(ghc-getghcpkg)" \
338 --prefix="${EPREFIX}"/usr \
339 --libdir="${EPREFIX}"/usr/$(get_libdir) \
340 --libsubdir=${P}/ghc-$(ghc-version) \
341 --datadir="${EPREFIX}"/usr/share/ \
342 --datasubdir=${P}/ghc-$(ghc-version) \
343 ${cabalconf} \
344 ${CABAL_CONFIGURE_FLAGS} \
345 ${CABAL_EXTRA_CONFIGURE_FLAGS} \
346 "$@"
347 echo ./setup "$@"
348 ./setup "$@" || cabal-show-brokens-and-die "setup configure failed"
349 }
350
351 cabal-build() {
352 unset LANG LC_ALL LC_MESSAGES
353 set -- build ${CABAL_EXTRA_BUILD_FLAGS} "$@"
354 echo ./setup "$@"
355 ./setup "$@" \
356 || die "setup build failed"
357 }
358
359 cabal-copy() {
360 has "${EAPI:-0}" 0 1 2 && ! use prefix && ED=${D}
361
362 set -- copy --destdir="${D}" "$@"
363 echo ./setup "$@"
364 ./setup "$@" || die "setup copy failed"
365
366 # cabal is a bit eager about creating dirs,
367 # so remove them if they are empty
368 rmdir "${ED}/usr/bin" 2> /dev/null
369 }
370
371 cabal-pkg() {
372 # This does not actually register since we're using true instead
373 # of ghc-pkg. So it just leaves the .conf file and we can
374 # register that ourselves (if it exists).
375
376 if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
377 # Newer cabal can generate a package conf for us:
378 ./setup register --gen-pkg-config="${T}/${P}.conf"
379 ghc-setup-pkg "${T}/${P}.conf"
380 ghc-install-pkg
381 fi
382 }
383
384 # Some cabal libs are bundled along with some versions of ghc
385 # eg filepath-1.0 comes with ghc-6.6.1
386 # by putting CABAL_CORE_LIB_GHC_PV="6.6.1" in an ebuild we are declaring that
387 # when building with this version of ghc, the ebuild is a dummy that is it will
388 # install no files since the package is already included with ghc.
389 # However portage still records the dependency and we can upgrade the package
390 # to a later one that's not included with ghc.
391 # You can also put a space separated list, eg CABAL_CORE_LIB_GHC_PV="6.6 6.6.1".
392 cabal-is-dummy-lib() {
393 for version in ${CABAL_CORE_LIB_GHC_PV[*]}; do
394 [[ "$(ghc-version)" == ${version} ]] && return 0
395 done
396 return 1
397 }
398
399 # exported function: check if cabal is correctly installed for
400 # the currently active ghc (we cannot guarantee this with portage)
401 haskell-cabal_pkg_setup() {
402 if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
403 [[ ${RDEPEND} == *dev-lang/ghc* ]] || eqawarn "QA Notice: A library does not have runtime dependency on dev-lang/ghc."
404 fi
405 if [[ -z "${CABAL_HAS_BINARIES}" ]] && [[ -z "${CABAL_HAS_LIBRARIES}" ]]; then
406 eqawarn "QA Notice: Neither bin nor lib are in CABAL_FEATURES."
407 fi
408 if [[ -n "${CABAL_UNKNOWN}" ]]; then
409 eqawarn "QA Notice: Unknown entry in CABAL_FEATURES: ${CABAL_UNKNOWN}"
410 fi
411 if cabal-is-dummy-lib; then
412 einfo "${P} is included in ghc-${CABAL_CORE_LIB_GHC_PV}, nothing to install."
413 fi
414 }
415
416 haskell-cabal_src_configure() {
417 cabal-is-dummy-lib && return
418
419 pushd "${S}" > /dev/null
420
421 cabal-bootstrap
422
423 cabal-configure "$@"
424
425 popd > /dev/null
426 }
427
428 # exported function: nice alias
429 cabal_src_configure() {
430 haskell-cabal_src_configure "$@"
431 }
432
433 # exported function: cabal-style bootstrap configure and compile
434 cabal_src_compile() {
435 # it's a common mistake when one bumps ebuild to EAPI="2" (and upper)
436 # and forgets to separate src_compile() to src_configure()/src_compile().
437 # Such error leads to default src_configure and we lose all passed flags.
438 if ! has "${EAPI:-0}" 0 1; then
439 local passed_flag
440 for passed_flag in "$@"; do
441 [[ ${passed_flag} == --flags=* ]] && \
442 eqawarn "QA Notice: Cabal option '${passed_flag}' has effect only in src_configure()"
443 done
444 fi
445
446 cabal-is-dummy-lib && return
447
448 has src_configure ${HASKELL_CABAL_EXPF} || haskell-cabal_src_configure "$@"
449 cabal-build
450
451 if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
452 if [[ -n "${CABAL_USE_HSCOLOUR}" ]] && use hscolour; then
453 # hscolour and haddock
454 cabal-hscolour-haddock
455 else
456 # just haddock
457 cabal-haddock
458 fi
459 else
460 if [[ -n "${CABAL_USE_HSCOLOUR}" ]] && use hscolour; then
461 # just hscolour
462 cabal-hscolour
463 fi
464 fi
465 }
466
467 haskell-cabal_src_compile() {
468 pushd "${S}" > /dev/null
469
470 cabal_src_compile "$@"
471
472 popd > /dev/null
473 }
474
475 haskell-cabal_src_test() {
476 pushd "${S}" > /dev/null
477
478 if cabal-is-dummy-lib; then
479 einfo ">>> No tests for dummy library: ${CATEGORY}/${PF}"
480 else
481 einfo ">>> Test phase [cabal test]: ${CATEGORY}/${PF}"
482 set -- test "$@"
483 echo ./setup "$@"
484 ./setup "$@" || die "cabal test failed"
485 fi
486
487 popd > /dev/null
488 }
489
490 # exported function: cabal-style copy and register
491 cabal_src_install() {
492 has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
493
494 if ! cabal-is-dummy-lib; then
495 cabal-copy
496 cabal-pkg
497 fi
498
499 # create a dummy local package conf file for haskell-updater
500 # if it does not exist (dummy libraries and binaries w/o libraries)
501 local ghc_confdir_with_prefix="$(ghc-confdir)"
502 # remove EPREFIX
503 dodir ${ghc_confdir_with_prefix#${EPREFIX}}
504 local conf_file="${D}/$(ghc-confdir)/$(ghc-localpkgconf)"
505 [[ -e $conf_file ]] || echo '[]' > "$conf_file" || die
506
507 # make sure installed packages do not destroy ghc's
508 # bundled packages
509 local initial_pkg_db=${ROOT}/$(ghc-libdir)/package.conf.d.initial
510 if [[ -e ${initial_pkg_db} ]]; then
511 local checked_pkg
512 for checked_pkg in $(ghc-listpkg "${conf_file}")
513 do
514 local initial_pkg
515 for initial_pkg in $(ghc-listpkg "${initial_pkg_db}"); do
516 if [[ ${checked_pkg} = ${initial_pkg} ]]; then
517 eerror "Package ${checked_pkg} is shipped with $(ghc-version)."
518 eerror "Ebuild author forgot CABAL_CORE_LIB_GHC_PV entry."
519 eerror "Found in ${initial_pkg_db}."
520 die
521 fi
522 done
523 done
524 fi
525 }
526
527 haskell-cabal_src_install() {
528 pushd "${S}" > /dev/null
529
530 cabal_src_install
531
532 popd > /dev/null
533 }
534
535 # @FUNCTION: cabal_flag
536 # @DESCRIPTION:
537 # ebuild.sh:use_enable() taken as base
538 #
539 # Usage examples:
540 #
541 # CABAL_CONFIGURE_FLAGS=$(cabal_flag gui)
542 # leads to "--flags=gui" or "--flags=-gui" (useflag 'gui')
543 #
544 # CABAL_CONFIGURE_FLAGS=$(cabal_flag gtk gui)
545 # also leads to "--flags=gui" or " --flags=-gui" (useflag 'gtk')
546 #
547 cabal_flag() {
548 if [[ -z "$1" ]]; then
549 echo "!!! cabal_flag() called without a parameter." >&2
550 echo "!!! cabal_flag() <USEFLAG> [<cabal_flagname>]" >&2
551 return 1
552 fi
553
554 local UWORD=${2:-$1}
555
556 if use "$1"; then
557 echo "--flags=${UWORD}"
558 else
559 echo "--flags=-${UWORD}"
560 fi
561
562 return 0
563 }
564
565 # @FUNCTION: cabal_chdeps
566 # @DESCRIPTION:
567 # Allows easier patching of $CABAL_FILE (${S}/${PN}.cabal by default)
568 # depends
569 #
570 # Accepts argument list as pairs of substitutions: <from-string> <to-string>...
571 #
572 # Dies on error.
573 #
574 # Usage examples:
575 #
576 # src_prepare() {
577 # cabal_chdeps \
578 # 'base >= 4.2 && < 4.6' 'base >= 4.2 && < 4.7' \
579 # 'containers ==0.4.*' 'containers >= 0.4 && < 0.6'
580 #}
581 # or
582 # src_prepare() {
583 # CABAL_FILE=${S}/${MY_PN}.cabal cabal_chdeps \
584 # 'base >= 4.2 && < 4.6' 'base >= 4.2 && < 4.7'
585 # CABAL_FILE=${S}/${MY_PN}-tools.cabal cabal_chdeps \
586 # 'base == 3.*' 'base >= 4.2 && < 4.7'
587 #}
588 #
589 cabal_chdeps() {
590 local cf=${CABAL_FILE:-${S}/${PN}.cabal}
591 local from_ss # ss - substring
592 local to_ss
593 local orig_c # c - contents
594 local new_c
595
596 [[ -f $cf ]] || die "cabal file '$cf' does not exist"
597
598 orig_c=$(< "$cf")
599
600 while :; do
601 from_pat=$1
602 to_str=$2
603
604 [[ -n ${from_pat} ]] || break
605 [[ -n ${to_str} ]] || die "'${from_str}' does not have 'to' part"
606
607 einfo "CHDEP: '${from_pat}' -> '${to_str}'"
608
609 # escape pattern-like symbols
610 from_pat=${from_pat//\*/\\*}
611 from_pat=${from_pat//\[/\\[}
612
613 new_c=${orig_c//${from_pat}/${to_str}}
614
615 if [[ -n $CABAL_DEBUG_LOOSENING ]]; then
616 echo "${orig_c}" >"${T}/${cf}".pre
617 echo "${new_c}" >"${T}/${cf}".post
618 diff -u "${T}/${cf}".{pre,post}
619 fi
620
621 [[ "${orig_c}" == "${new_c}" ]] && die "no trigger for '${from_pat}'"
622 orig_c=${new_c}
623 shift
624 shift
625 done
626
627 echo "${new_c}" > "$cf" ||
628 die "failed to update"
629 }

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