Makefile: automatically install stack if needed

"install-stack" target will try more methods

1 files changed, 20 insertions, 4 deletions

diff --git a/Makefile b/Makefile
index b082c3d..1303b5e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,9 @@
-all:
+stack_path != which stack
+
+all: $(if $(stack_path),,install-stack)
         stack build
         ln -sfT $$(stack path --local-install-root)/bin ./bin
 
-install-stack:
-        curl -sSL https://get.haskellstack.org/ | sh
-
 .PHONY: all run install install-dev-tools
 
 run: all
@@ -15,3 +14,20 @@ install:
 
 install-dev-tools:
         stack install apply-refact hlint stylish-haskell hasktags hoogle
+
+become_root != [ "$$(id -u)" = 0 ] || echo sudo
+install-stack:
+ifneq (,$(shell which curl))
+        curl -sSL https://get.haskellstack.org/ | sh
+else
+ifneq (,$(shell which wget))
+        wget -qO- https://get.haskellstack.org/ | sh
+else
+ifneq (,$(shell which apt))
+        $(become_root) apt install haskell-stack
+else
+        $(error No stack binary found; and no known means of installing (no curl, wget, or apt).\
+        Follow instructions at <https://haskellstack.org>)
+endif
+endif
+endif