From 259cd8442ca4132257c7699076c48a9dff376ee4 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@cryptonomic.net>
Date: Fri, 23 Sep 2022 10:39:51 -0400
Subject: Makefile: automatically install stack if needed

"install-stack" target will try more methods
---
 Makefile | 24 ++++++++++++++++++++----
 1 file 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
-- 
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