[pkgsrc/trunk]: pkgsrc/mk Support Cabal packages that lack Setup.?hs

[pho <pho%pkgsrc.org@localhost>]

details:   https://anonhg.NetBSD.org/pkgsrc/rev/904c7d25d737
branches:  trunk
changeset: 451781:904c7d25d737
user:      pho <pho%pkgsrc.org@localhost>
date:      Sat May 01 14:10:55 2021 +0000

description:
Support Cabal packages that lack Setup.?hs

They currently have Setup.hs in ${FILESDIR} with almost always the same
content. We can do better than that.

diffstat:

 mk/haskell.mk |  39 ++++++++++++++++++++++++++++++++++++++-
 1 files changed, 38 insertions(+), 1 deletions(-)

diffs (53 lines):

diff -r 6c590c265469 -r 904c7d25d737 mk/haskell.mk
--- a/mk/haskell.mk     Sat May 01 11:44:18 2021 +0000
+++ b/mk/haskell.mk     Sat May 01 14:10:55 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: haskell.mk,v 1.29 2021/04/23 03:57:16 pho Exp $
+# $NetBSD: haskell.mk,v 1.30 2021/05/01 14:10:55 pho Exp $
 #
 # This Makefile fragment handles Haskell Cabal packages.
 # Package configuration, building, installation, registration and
@@ -215,6 +215,43 @@
 # is much faster, we try it and then fall back to static linkage if
 # that didn't work.
 do-configure:
+# Cabal packages are expected to have either Setup.hs or Setup.lhs,
+# but its existence is not mandatory these days because the standard
+# way to build a cabal package is to use the cabal-install command,
+# which is not always available to us. As a result some packages
+# actually lack it. The problem is that its expected content depends
+# on the build-type field in *.cabal so we have to read it.
+       ${RUN} if ! ${TEST} -f ${WRKSRC}/Setup.hs -a -f ${WRKSRC}/Setup.lhs; then \
+               getBuildType=' \
+                       BEGIN { buildTypeLine=0 } \
+                       tolower($$1) ~ /^build-type:/ { \
+                               if ($$2) { \
+                                       print tolower($$2); exit \
+                               } \
+                               else { \
+                                       buildTypeLine=1; next \
+                               } \
+                       } \
+                       buildTypeLine { \
+                               print tolower($$1); exit \
+                       } \
+               '; \
+               buildType=`${CAT} ${WRKSRC}/*.cabal | ${AWK} "$$getBuildType"`; \
+               case "$$buildType" in \
+                       simple) \
+                               echo  >${WRKSRC}/Setup.hs 'import Distribution.Simple'; \
+                               echo >>${WRKSRC}/Setup.hs 'main = defaultMain';; \
+                       configure) \
+                               echo  >${WRKSRC}/Setup.hs 'import Distribution.Simple'; \
+                               echo >>${WRKSRC}/Setup.hs 'main = defaultMainWithHooks autoconfUserHooks';; \
+                       make) \
+                               echo  >${WRKSRC}/Setup.hs 'import Distribution.Make'; \
+                               echo >>${WRKSRC}/Setup.hs 'main = defaultMain';; \
+                       *) \
+                               echo >&2 "Unknown Build-Type: $$buildType"; \
+                               exit 1;; \
+               esac; \
+       fi
        ${RUN} ${_ULIMIT_CMD} cd ${WRKSRC} && \
                ( ${_HASKELL_BIN:Q} ${_HASKELL_BUILD_SETUP_OPTS} --make Setup -dynamic || \
                        ${_HASKELL_BIN:Q} ${_HASKELL_BUILD_SETUP_OPTS} --make Setup -static )