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# Makefile for Cabal packages in stockholm[0].
# [0]: http://cgit.cd.krebsco.de/stockholm
pkg-name := $(basename $(wildcard *.cabal))
ifneq ($(words $(pkg-name)),1)
$(error pkg-name is not a single word but '$(pkg-name)')
endif
.ONESHELL:
.SHELLFLAGS := -efu -c
export STOCKHOLM := $(HOME)/stockholm
nix-shell-flags := -I nixpkgs="$$STOCKHOLM"
# make V=1 to enable verbose output
ifeq ($(V),1)
nix-shell-flags += -v
endif
# This is basically what load-env[1] did, which is mostly dead. Eventually
# this should also become a wrapper for entering a development environment.
# Notice that setting HOME is required for project-local GHCi history[2]. And
# as we have to do it anyway, we're also reusing it for other stuff.
# [1]: http://cgit.cd.krebsco.de/load-env
# [2]: https://ghc.haskell.org/trac/ghc/ticket/9089
.PHONY: shell
shell: shell.nix
@verbose() { echo "$$*" >&2; "$$@"; }
verbose export HOME="$$HOME"/.env-home/$(pkg-name)
test -d "$$HOME" || verbose mkdir -p -m 0700 "$$HOME"
! test -f "$$HOME"/profile || verbose . "$$HOME"/profile
export HISTFILE="$$HOME"/histfile HISTSIZE=100000
verbose nix-shell $(nix-shell-flags) --command 'exec ghci'
shell.nix: $(pkg-name).cabal
cabal2nix --shell . > $@
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