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Revision 1.25 - (hide annotations) (download)
Mon Aug 22 04:46:32 2011 UTC (3 years, 2 months ago) by vapier
Branch: MAIN
Changes since 1.24: +10 -10 lines
fix random bugs in eclass documentation, and convert to new @AUTHOR tag

1 slyfox 1.23 # Copyright 1999-2011 Gentoo Foundation
2 kosmikus 1.1 # Distributed under the terms of the GNU General Public License v2
3 vapier 1.25 # $Header: /var/cvsroot/gentoo-x86/eclass/haskell-cabal.eclass,v 1.24 2011/05/08 15:13:10 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 kosmikus 1.1 # 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 kolmodin 1.21 # hscolour -- generation of colourised sources
22 kosmikus 1.1 # alex -- lexer/scanner generator
23     # happy -- parser generator
24     # c2hs -- C interface generator
25     # cpphs -- C preprocessor clone written in Haskell
26     # profile -- if package supports to build profiling-enabled libraries
27     # bootstrap -- only used for the cabal package itself
28 dcoutts 1.3 # bin -- the package installs binaries
29     # lib -- the package installs libraries
30 kolmodin 1.16 # nocabaldep -- don't add dependency on cabal.
31 slyfox 1.23 # only used for packages that _must_ not pull the dependency
32     # on cabal, but still use this eclass (e.g. haskell-updater).
33 kosmikus 1.1 #
34     # Dependencies on other cabal packages have to be specified
35     # correctly.
36     #
37     # Cabal libraries should usually be SLOTted with "${PV}".
38     #
39     # Many Cabal packages require S to be manually set.
40     #
41     # Conforming Cabal packages don't require any function definitions
42     # in the ebuild.
43 kosmikus 1.8 #
44     # Special flags to Cabal Configure can now be set by using
45     # CABAL_CONFIGURE_FLAGS
46 kosmikus 1.1
47 dcoutts 1.11 inherit ghc-package multilib
48 kosmikus 1.1
49 slyfox 1.24 # @ECLASS-VARIABLE: CABAL_EXTRA_CONFIGURE_FLAGS
50     # @DESCRIPTION:
51     # User-specified additional parameters passed to 'setup configure'.
52     # example: /etc/make.conf: CABAL_EXTRA_CONFIGURE_FLAGS=--enable-shared
53     : ${CABAL_EXTRA_CONFIGURE_FLAGS:=}
54    
55     # @ECLASS-VARIABLE: GHC_BOOTSTRAP_FLAGS
56     # @DESCRIPTION:
57     # User-specified additional parameters for ghc when building
58     # _only_ 'setup' binary bootstrap.
59     # example: /etc/make.conf: GHC_BOOTSTRAP_FLAGS=-dynamic to make
60     # linking 'setup' faster.
61     : ${GHC_BOOTSTRAP_FLAGS:=}
62    
63 kolmodin 1.19 HASKELL_CABAL_EXPF="pkg_setup src_compile src_test src_install"
64    
65     case "${EAPI:-0}" in
66     2|3|4) HASKELL_CABAL_EXPF+=" src_configure" ;;
67     *) ;;
68     esac
69    
70     EXPORT_FUNCTIONS ${HASKELL_CABAL_EXPF}
71 kosmikus 1.1
72     for feature in ${CABAL_FEATURES}; do
73     case ${feature} in
74 kolmodin 1.16 haddock) CABAL_USE_HADDOCK=yes;;
75 kolmodin 1.21 hscolour) CABAL_USE_HSCOLOUR=yes;;
76 kolmodin 1.16 alex) CABAL_USE_ALEX=yes;;
77     happy) CABAL_USE_HAPPY=yes;;
78     c2hs) CABAL_USE_C2HS=yes;;
79     cpphs) CABAL_USE_CPPHS=yes;;
80     profile) CABAL_USE_PROFILE=yes;;
81     bootstrap) CABAL_BOOTSTRAP=yes;;
82     bin) CABAL_HAS_BINARIES=yes;;
83     lib) CABAL_HAS_LIBRARIES=yes;;
84     nocabaldep) CABAL_FROM_GHC=yes;;
85 dcoutts 1.3 *) CABAL_UNKNOWN="${CABAL_UNKNOWN} ${feature}";;
86 kosmikus 1.1 esac
87     done
88    
89     if [[ -n "${CABAL_USE_HADDOCK}" ]]; then
90     IUSE="${IUSE} doc"
91     DEPEND="${DEPEND} doc? ( dev-haskell/haddock )"
92     fi
93    
94 kolmodin 1.21 if [[ -n "${CABAL_USE_HSCOLOUR}" ]]; then
95     IUSE="${IUSE} hscolour"
96     DEPEND="${DEPEND} hscolour? ( dev-haskell/hscolour )"
97     fi
98    
99 kosmikus 1.1 if [[ -n "${CABAL_USE_ALEX}" ]]; then
100     DEPEND="${DEPEND} dev-haskell/alex"
101     fi
102    
103     if [[ -n "${CABAL_USE_HAPPY}" ]]; then
104     DEPEND="${DEPEND} dev-haskell/happy"
105     fi
106    
107     if [[ -n "${CABAL_USE_C2HS}" ]]; then
108     DEPEND="${DEPEND} dev-haskell/c2hs"
109     fi
110    
111     if [[ -n "${CABAL_USE_CPPHS}" ]]; then
112     DEPEND="${DEPEND} dev-haskell/cpphs"
113     fi
114    
115     if [[ -n "${CABAL_USE_PROFILE}" ]]; then
116     IUSE="${IUSE} profile"
117     fi
118    
119     # We always use a standalone version of Cabal, rather than the one that comes
120     # with GHC. But of course we can't depend on cabal when building cabal itself.
121 dcoutts 1.14 if [[ -z ${CABAL_MIN_VERSION} ]]; then
122     CABAL_MIN_VERSION=1.1.4
123     fi
124 kolmodin 1.16 if [[ -z "${CABAL_BOOTSTRAP}" && -z "${CABAL_FROM_GHC}" ]]; then
125 dcoutts 1.11 DEPEND="${DEPEND} >=dev-haskell/cabal-${CABAL_MIN_VERSION}"
126 kosmikus 1.1 fi
127    
128 dcoutts 1.3 # Libraries require GHC to be installed.
129     if [[ -n "${CABAL_HAS_LIBRARIES}" ]]; then
130 dcoutts 1.11 RDEPEND="${RDEPEND} dev-lang/ghc"
131 dcoutts 1.3 fi
132 kosmikus 1.1
133 dcoutts 1.14 # returns the version of cabal currently in use
134     _CABAL_VERSION_CACHE=""
135     cabal-version() {
136     if [[ -z "${_CABAL_VERSION_CACHE}" ]]; then
137     if [[ "${CABAL_BOOTSTRAP}" ]]; then
138     # We're bootstrapping cabal, so the cabal version is the version
139     # of this package itself.
140     _CABAL_VERSION_CACHE="${PV}"
141 kolmodin 1.17 elif [[ "${CABAL_FROM_GHC}" ]]; then
142 slyfox 1.24 local cabal_package=$(echo "$(ghc-libdir)"/Cabal-*)
143     # /path/to/ghc/Cabal-${VER} -> ${VER}
144     _CABAL_VERSION_CACHE="${cabal_package/*Cabal-/}"
145 dcoutts 1.14 else
146     # We ask portage, not ghc, so that we only pick up
147     # portage-installed cabal versions.
148     _CABAL_VERSION_CACHE="$(ghc-extractportageversion dev-haskell/cabal)"
149     fi
150     fi
151     echo "${_CABAL_VERSION_CACHE}"
152     }
153    
154 kosmikus 1.1 cabal-bootstrap() {
155     local setupmodule
156 dcoutts 1.14 local cabalpackage
157 kosmikus 1.1 if [[ -f "${S}/Setup.lhs" ]]; then
158     setupmodule="${S}/Setup.lhs"
159     else
160     if [[ -f "${S}/Setup.hs" ]]; then
161     setupmodule="${S}/Setup.hs"
162     else
163     die "No Setup.lhs or Setup.hs found"
164     fi
165     fi
166    
167     # We build the setup program using the latest version of
168     # cabal that we have installed
169 dcoutts 1.14 if version_is_at_least "6.4" "$(ghc-version)"; then
170     cabalpackage=Cabal-$(cabal-version)
171     else
172     # older ghc's don't support package versioning
173     cabalpackage=Cabal
174     fi
175     einfo "Using cabal-$(cabal-version)."
176 slyfox 1.24
177     make_setup() {
178     $(ghc-getghc) -package "${cabalpackage}" --make "${setupmodule}" \
179     ${GHC_BOOTSTRAP_FLAGS} \
180     "$@" \
181     -o setup
182     }
183     if $(ghc-supports-shared-libraries); then
184     # some custom build systems might use external libraries,
185     # for which we don't have shared libs, so keep static fallback
186     make_setup -dynamic "$@" || make_setup "$@" || die "compiling ${setupmodule} failed"
187     else
188     make_setup "$@" || die "compiling ${setupmodule} failed"
189     fi
190 kosmikus 1.1 }
191    
192 dcoutts 1.14 cabal-mksetup() {
193     local setupdir
194    
195     if [[ -n $1 ]]; then
196     setupdir=$1
197     else
198     setupdir=${S}
199     fi
200    
201     rm -f "${setupdir}"/Setup.{lhs,hs}
202    
203     echo 'import Distribution.Simple; main = defaultMainWithHooks defaultUserHooks' \
204     > $setupdir/Setup.hs
205     }
206    
207 kolmodin 1.21 cabal-hscolour() {
208     ./setup hscolour || die "setup hscolour failed"
209     }
210    
211 kosmikus 1.1 cabal-haddock() {
212     ./setup haddock || die "setup haddock failed"
213     }
214    
215 kolmodin 1.21 cabal-hscolour-haddock() {
216     # --hyperlink-source implies calling 'setup hscolour'
217     ./setup haddock --hyperlink-source || die "setup haddock failed"
218     }
219    
220 kosmikus 1.1 cabal-configure() {
221 slyfox 1.23 has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
222    
223 dcoutts 1.14 if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
224 slyfox 1.23 cabalconf="${cabalconf} --with-haddock=${EPREFIX}/usr/bin/haddock"
225 dcoutts 1.14 fi
226 kosmikus 1.1 if [[ -n "${CABAL_USE_PROFILE}" ]] && use profile; then
227 dcoutts 1.2 cabalconf="${cabalconf} --enable-library-profiling"
228 kosmikus 1.1 fi
229 slyfox 1.23 if [[ -n "${CABAL_USE_ALEX}" ]]; then
230     cabalconf="${cabalconf} --with-alex=${EPREFIX}/usr/bin/alex"
231     fi
232    
233     if [[ -n "${CABAL_USE_HAPPY}" ]]; then
234     cabalconf="${cabalconf} --with-happy=${EPREFIX}/usr/bin/happy"
235     fi
236    
237     if [[ -n "${CABAL_USE_C2HS}" ]]; then
238     cabalconf="${cabalconf} --with-c2hs=${EPREFIX}/usr/bin/c2hs"
239     fi
240     if [[ -n "${CABAL_USE_CPPHS}" ]]; then
241     cabalconf="${cabalconf} --with-cpphs=${EPREFIX}/usr/bin/cpphs"
242     fi
243    
244 dcoutts 1.6 # Building GHCi libs on ppc64 causes "TOC overflow".
245     if use ppc64; then
246 dcoutts 1.5 cabalconf="${cabalconf} --disable-library-for-ghci"
247     fi
248 kosmikus 1.1
249 slyfox 1.24 # currently cabal does not respect CFLAGS and LDFLAGS on it's own (bug #333217)
250     # so translate LDFLAGS to ghc parameters (without filtering)
251     local flag
252     for flag in $LDFLAGS; do cabalconf="${cabalconf} --ghc-option=-optl$flag"; done
253    
254 kolmodin 1.18 if version_is_at_least "1.4" "$(cabal-version)"; then
255     # disable executable stripping for the executables, as portage will
256     # strip by itself, and pre-stripping gives a QA warning.
257     # cabal versions previous to 1.4 does not strip executables, and does
258     # not accept the flag.
259     # this fixes numerous bugs, amongst them;
260     # bug #251881, bug #251882, bug #251884, bug #251886, bug #299494
261     cabalconf="${cabalconf} --disable-executable-stripping"
262     fi
263    
264 dcoutts 1.14 if version_is_at_least "1.2.0" "$(cabal-version)"; then
265 slyfox 1.23 cabalconf="${cabalconf} --docdir=${EPREFIX}/usr/share/doc/${PF}"
266 dcoutts 1.14 # As of Cabal 1.2, configure is quite quiet. For diagnostic purposes
267     # it's better if the configure chatter is in the build logs:
268     cabalconf="${cabalconf} --verbose"
269     fi
270     # Note: with Cabal-1.1.6.x we do not have enough control
271 dcoutts 1.11 # to put the docs into the right place. They're currently going
272     # into /usr/share/${P}/ghc-x.y/doc/
273     # rather than /usr/share/doc/${PF}/
274     # Because we can only set the datadir, not the docdir.
275    
276 slyfox 1.24 # We build shared version of our Cabal where ghc ships it's shared
277     # version of it. We will link ./setup as dynamic binary againt Cabal later.
278     [[ ${CATEGORY}/${PN} == "dev-haskell/cabal" ]] && \
279     $(ghc-supports-shared-libraries) && \
280     cabalconf="${cabalconf} --enable-shared"
281    
282 kosmikus 1.1 ./setup configure \
283 slyfox 1.23 --ghc --prefix="${EPREFIX}"/usr \
284 kosmikus 1.1 --with-compiler="$(ghc-getghc)" \
285     --with-hc-pkg="$(ghc-getghcpkg)" \
286 slyfox 1.23 --prefix="${EPREFIX}"/usr \
287     --libdir="${EPREFIX}"/usr/$(get_libdir) \
288 dcoutts 1.11 --libsubdir=${P}/ghc-$(ghc-version) \
289 slyfox 1.23 --datadir="${EPREFIX}"/usr/share/ \
290 dcoutts 1.11 --datasubdir=${P}/ghc-$(ghc-version) \
291 kosmikus 1.1 ${cabalconf} \
292 kosmikus 1.8 ${CABAL_CONFIGURE_FLAGS} \
293 slyfox 1.24 ${CABAL_EXTRA_CONFIGURE_FLAGS} \
294 kosmikus 1.1 "$@" || die "setup configure failed"
295     }
296    
297     cabal-build() {
298 dcoutts 1.14 unset LANG LC_ALL LC_MESSAGES
299 kosmikus 1.1 ./setup build \
300     || die "setup build failed"
301     }
302    
303     cabal-copy() {
304 slyfox 1.23 has "${EAPI:-0}" 0 1 2 && ! use prefix && ED=${D}
305    
306 kosmikus 1.1 ./setup copy \
307 dcoutts 1.11 --destdir="${D}" \
308 kosmikus 1.1 || die "setup copy failed"
309    
310     # cabal is a bit eager about creating dirs,
311     # so remove them if they are empty
312 slyfox 1.23 rmdir "${ED}/usr/bin" 2> /dev/null
313 kosmikus 1.1
314     # GHC 6.4 has a bug in get/setPermission and Cabal 1.1.1 has
315     # no workaround.
316     # set the +x permission on executables
317 slyfox 1.23 if [[ -d "${ED}/usr/bin" ]] ; then
318     chmod +x "${ED}/usr/bin/"*
319 kosmikus 1.1 fi
320 dcoutts 1.11 # TODO: do we still need this?
321 kosmikus 1.1 }
322    
323     cabal-pkg() {
324 kosmikus 1.9 # This does not actually register since we're using true instead
325 kosmikus 1.1 # of ghc-pkg. So it just leaves the .installed-pkg-config and we can
326     # register that ourselves (if it exists).
327 dcoutts 1.2 local result
328     local err
329    
330 dcoutts 1.4 if [[ -n ${CABAL_HAS_LIBRARIES} ]]; then
331 dcoutts 1.14 if version_is_at_least "1.2.0" "$(cabal-version)"; then
332     # Newer cabal can generate a package conf for us:
333     ./setup register --gen-pkg-config="${T}/${P}.conf"
334     ghc-setup-pkg "${T}/${P}.conf"
335 dcoutts 1.4 ghc-install-pkg
336     else
337 dcoutts 1.14 # With older cabal we have to hack it by replacing its ghc-pkg
338     # with true and then just picking up the .installed-pkg-config
339     # file and registering that ourselves (if it exists).
340     sed -i "s|$(ghc-getghcpkg)|$(type -P true)|" .setup-config
341     ./setup register || die "setup register failed"
342     if [[ -f .installed-pkg-config ]]; then
343     ghc-setup-pkg .installed-pkg-config
344     ghc-install-pkg
345     else
346     die "setup register has not generated a package configuration file"
347     fi
348 dcoutts 1.4 fi
349 kosmikus 1.1 fi
350     }
351    
352 kolmodin 1.13 # Some cabal libs are bundled along with some versions of ghc
353     # eg filepath-1.0 comes with ghc-6.6.1
354     # by putting CABAL_CORE_LIB_GHC_PV="6.6.1" in an ebuild we are declaring that
355     # when building with this version of ghc, the ebuild is a dummy that is it will
356     # install no files since the package is already included with ghc.
357     # However portage still records the dependency and we can upgrade the package
358     # to a later one that's not included with ghc.
359     # You can also put a space separated list, eg CABAL_CORE_LIB_GHC_PV="6.6 6.6.1".
360     cabal-is-dummy-lib() {
361     for version in ${CABAL_CORE_LIB_GHC_PV[*]}; do
362     [[ "$(ghc-version)" == "$version" ]] && return 0
363     done
364     return 1
365     }
366    
367 kosmikus 1.1 # exported function: check if cabal is correctly installed for
368     # the currently active ghc (we cannot guarantee this with portage)
369     haskell-cabal_pkg_setup() {
370 dcoutts 1.11 ghc-package_pkg_setup
371 kolmodin 1.16 if [[ -z "${CABAL_BOOTSTRAP}" && -z "${CABAL_FROM_GHC}" ]] && ! ghc-sanecabal "${CABAL_MIN_VERSION}"; then
372 kosmikus 1.1 eerror "The package dev-haskell/cabal is not correctly installed for"
373     eerror "the currently active version of ghc ($(ghc-version)). Please"
374 kolmodin 1.16 eerror "run ghc-updater or haskell-updater or re-build dev-haskell/cabal."
375 kosmikus 1.1 die "cabal is not correctly installed"
376     fi
377 dcoutts 1.4 if [[ -z "${CABAL_HAS_BINARIES}" ]] && [[ -z "${CABAL_HAS_LIBRARIES}" ]]; then
378     eerror "QA: Neither bin nor lib are in CABAL_FEATURES."
379     fi
380 dcoutts 1.3 if [[ -n "${CABAL_UNKNOWN}" ]]; then
381 kolmodin 1.15 ewarn "Unknown entry in CABAL_FEATURES: ${CABAL_UNKNOWN}"
382 dcoutts 1.3 fi
383 kolmodin 1.13 if cabal-is-dummy-lib; then
384     einfo "${P} is included in ghc-${CABAL_CORE_LIB_GHC_PV}, nothing to install."
385     fi
386 kosmikus 1.1 }
387    
388 kolmodin 1.19 haskell-cabal_src_configure() {
389 slyfox 1.23 if ! cabal-is-dummy-lib; then
390     pushd "${S}" > /dev/null
391 kolmodin 1.19
392 slyfox 1.23 cabal-bootstrap
393 slyfox 1.22
394 slyfox 1.23 cabal-configure $ghc_flags "$@"
395 kolmodin 1.19
396 slyfox 1.23 popd > /dev/null
397     fi
398 kolmodin 1.19 }
399    
400     # exported function: nice alias
401     cabal_src_configure() {
402     haskell-cabal_src_configure "$@"
403     }
404    
405 kosmikus 1.1 # exported function: cabal-style bootstrap configure and compile
406     cabal_src_compile() {
407 slyfox 1.24 # it's a common mistake when one bumps ebuild to EAPI="2" (and upper)
408     # and forgets to separate src_compile() to src_configure()/src_compile().
409     # Such error leads to default src_configure and we lose all passed flags.
410     if ! has "${EAPI:-0}" 0 1; then
411     local passed_flag
412     for passed_flag in "$@"; do
413     [[ ${passed_flag} == --flags=* ]] && \
414     eqawarn "Cabal option '${passed_flag}' has effect only in src_configure()"
415     done
416     fi
417    
418 kolmodin 1.13 if ! cabal-is-dummy-lib; then
419 kolmodin 1.19 has src_configure ${HASKELL_CABAL_EXPF} || haskell-cabal_src_configure "$@"
420 kolmodin 1.13 cabal-build
421 kosmikus 1.1
422 kolmodin 1.13 if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
423 kolmodin 1.21 if [[ -n "${CABAL_USE_HSCOLOUR}" ]] && use hscolour; then
424     # hscolour and haddock
425     cabal-hscolour-haddock
426     else
427     # just haddock
428     cabal-haddock
429     fi
430     else
431     if [[ -n "${CABAL_USE_HSCOLOUR}" ]] && use hscolour; then
432     # just hscolour
433     cabal-hscolour
434     fi
435 kolmodin 1.13 fi
436 kosmikus 1.1 fi
437     }
438 kolmodin 1.16
439 kosmikus 1.1 haskell-cabal_src_compile() {
440 kolmodin 1.19 pushd "${S}" > /dev/null
441    
442     cabal_src_compile "$@"
443    
444     popd > /dev/null
445     }
446    
447     haskell-cabal_src_test() {
448     pushd "${S}" > /dev/null
449    
450 kolmodin 1.20 if cabal-is-dummy-lib; then
451     einfo ">>> No tests for dummy library: ${CATEGORY}/${PF}"
452     else
453     einfo ">>> Test phase [cabal test]: ${CATEGORY}/${PF}"
454     ./setup test || die "cabal test failed"
455     fi
456 kolmodin 1.19
457     popd > /dev/null
458 kosmikus 1.1 }
459    
460     # exported function: cabal-style copy and register
461     cabal_src_install() {
462 slyfox 1.23 has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
463    
464 kolmodin 1.13 if cabal-is-dummy-lib; then
465     # create a dummy local package conf file for the sake of ghc-updater
466 slyfox 1.23 local ghc_confdir_with_prefix="$(ghc-confdir)"
467     # remove EPREFIX
468     dodir ${ghc_confdir_with_prefix#${EPREFIX}}
469 kolmodin 1.13 echo '[]' > "${D}/$(ghc-confdir)/$(ghc-localpkgconf)"
470     else
471     cabal-copy
472     cabal-pkg
473 kosmikus 1.1
474 kolmodin 1.13 if [[ -n "${CABAL_USE_HADDOCK}" ]] && use doc; then
475 dcoutts 1.14 if ! version_is_at_least "1.1.6" "$(cabal-version)"; then
476 kolmodin 1.13 dohtml -r dist/doc/html/*
477     fi
478 dcoutts 1.11 fi
479 kosmikus 1.1 fi
480     }
481 kolmodin 1.19
482 kosmikus 1.1 haskell-cabal_src_install() {
483 kolmodin 1.19 pushd "${S}" > /dev/null
484    
485 kosmikus 1.1 cabal_src_install
486 kolmodin 1.19
487     popd > /dev/null
488 kosmikus 1.1 }
489    
490 kolmodin 1.19 # ebuild.sh:use_enable() taken as base
491     #
492     # Usage examples:
493     #
494     # CABAL_CONFIGURE_FLAGS=$(cabal_flag gui)
495     # leads to "--flags=gui" or "--flags=-gui" (useflag 'gui')
496     #
497     # CABAL_CONFIGURE_FLAGS=$(cabal_flag gtk gui)
498     # also leads to "--flags=gui" or " --flags=-gui" (useflag 'gtk')
499     #
500     cabal_flag() {
501     if [[ -z "$1" ]]; then
502     echo "!!! cabal_flag() called without a parameter." >&2
503     echo "!!! cabal_flag() <USEFLAG> [<cabal_flagname>]" >&2
504     return 1
505     fi
506    
507     local UWORD=${2:-$1}
508    
509     if use "$1"; then
510     echo "--flags=${UWORD}"
511     else
512     echo "--flags=-${UWORD}"
513     fi
514    
515     return 0
516     }

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