support building with BUILDER=stack to use stack instead of cabal

Makefile

@@ -1,7 +1,8 @@
 mans=$(shell find doc -maxdepth 1 -name git-annex*.mdwn | sed -e 's/^doc/man/' -e 's/\.mdwn/\.1/')
 all=git-annex mans docs
 
-CABAL?=cabal # set to "./Setup" if you lack a cabal program
+# set to "./Setup" if you lack a cabal program. Or can be set to "stack"
+BUILDER?=cabal
 GHC?=ghc
 
 PREFIX?=/usr
@@ -15,13 +16,21 @@ endif
 build: $(all)
 
 Build/SysConfig.hs: configure.hs Build/TestConfig.hs Build/Configure.hs
-	if [ "$(CABAL)" = ./Setup ]; then ghc --make Setup; fi
-	$(CABAL) configure --ghc-options="$(shell Build/collect-ghc-options.sh)"
+	if [ "$(BUILDER)" = ./Setup ]; then ghc --make Setup; fi
+	if [ "$(BUILDER)" = stack ]; then \
+		$(BUILDER) build -j1; \
+	else \
+		$(BUILDER) configure --ghc-options="$(shell Build/collect-ghc-options.sh)"; \
+	fi
 
 # -j1 is used for reproducible build
 git-annex: Build/SysConfig.hs
-	$(CABAL) build -j1
-	ln -sf dist/build/git-annex/git-annex git-annex
+	$(BUILDER) build -j1
+	if [ "$(BUILDER)" = stack ]; then \
+		ln -sf $(shell find .stack-work/ -name git-annex -type f | grep build/git-annex/git-annex) git-annex; \
+	else \
+		ln -sf dist/build/git-annex/git-annex git-annex; \
+	fi
 
 man/%.1: doc/%.mdwn
 	./Build/mdwn2man $@ 1 $< > $@
@@ -89,6 +98,7 @@ docs: mans
 		--exclude='users/*' --exclude='devblog/*' --exclude='thanks'
 
 clean:
+	$(BUILDER) clean
 	rm -rf tmp dist git-annex $(mans) configure  *.tix .hpc \
 		doc/.ikiwiki html dist tags Build/SysConfig.hs \
 		Setup Build/InstallDesktopFile Build/EvilSplicer \
@@ -206,9 +216,9 @@ ANDROID_FLAGS?=
 # Uses https://github.com/neurocyte/ghc-android
 android: Build/EvilSplicer
 	echo "Running native build, to get TH splices.."
-	if [ ! -e dist/setup/setup ]; then $(CABAL) configure -O0 $(ANDROID_FLAGS) -fAndroidSplice;  fi
+	if [ ! -e dist/setup/setup ]; then $(BUILDER) configure -O0 $(ANDROID_FLAGS) -fAndroidSplice;  fi
 	mkdir -p tmp
-	if ! $(CABAL) build --ghc-options=-ddump-splices 2> tmp/dump-splices; then tail tmp/dump-splices >&2; exit 1; fi
+	if ! $(BUILDER) build --ghc-options=-ddump-splices 2> tmp/dump-splices; then tail tmp/dump-splices >&2; exit 1; fi
 	echo "Setting up Android build tree.."
 	./Build/EvilSplicer tmp/splices tmp/dump-splices standalone/no-th/evilsplicer-headers.hs
 	rsync -az --exclude tmp --exclude dist . tmp/androidtree
@@ -250,8 +260,8 @@ fast: dist/caballog
 	@$(MAKE) tags >/dev/null 2>&1 &
 
 dist/caballog: git-annex.cabal
-	$(CABAL) configure -f"-Production" -O0 --enable-executable-dynamic
-	$(CABAL) build -v2 | tee $@
+	$(BUILDER) configure -f"-Production" -O0 --enable-executable-dynamic
+	$(BUILDER) build -v2 | tee $@
 
 # Hardcoded command line to make hdevtools start up and work.
 # You will need some memory. It's worth it.

debian/cabal-wrapper

@@ -1,6 +1,6 @@
 #!/bin/sh
 # It would be more usual to use:
-#   export CABAL=./Setup
+#   export BUILDER=./Setup
 # But Setup currently has a very bad dependency resolver, and very bad
 # debugging output, and tends to eat all memory and die on small buildds.
 # See https://github.com/haskell/cabal/issues/2777

debian/rules

@@ -1,6 +1,6 @@
 #!/usr/bin/make -f
 
-export CABAL=debian/cabal-wrapper
+export BUILDER=debian/cabal-wrapper
 
 STANDALONE_BUILD=$(shell grep -qe '^Package: git-annex-standalone' debian/control \
                          && echo 1 || echo 0)