CAD-2712 cabal-inside-nix-shell: use the script

Makefile

@@ -40,10 +40,10 @@ cluster-shell:
 	nix-shell --max-jobs 8 --cores 0 -A 'devops' --arg 'autoStartCluster' 'true'
 
 cabal-setup setup:
-	sed -ni '1,/--- 8< ---/ p' cabal.project
+	./scripts/cabal-inside-nix-shell.sh
 
 cabal-restore restore:
-	git checkout HEAD cabal.project
+	./scripts/cabal-inside-nix-shell.sh --restore
 
 cli node:
 	cabal --ghc-options="+RTS -qn8 -A32M -RTS" build cardano-$@
@@ -71,4 +71,4 @@ full-clean: clean
 cls:
 	echo -en "\ec"
 
-.PHONY: stylish-haskell cabal-hashes ghcid ghcid-test run-test test-ghci test-ghcid help clean clean-profile proclean cls
+.PHONY: stylish-haskell cabal-hashes ghcid ghcid-test run-test test-ghci test-ghcid help clean clean-profile proclean cls cabal-setup setup cabal-restore restore

cabal.project

@@ -87,9 +87,10 @@ package io-sim-classes
 
 -- ---------------------------------------------------------
 
--- The two following one-liners will restore / cut off the remainder of this file (for nix-shell users):
--- git checkout HEAD "$(git rev-parse --show-toplevel)"/cabal.project
--- sed -ni '1,/--- 8< ---/ p' "$(git rev-parse --show-toplevel)"/cabal.project
+-- The two following one-liners will cut off / restore the remainder of this file (for nix-shell users):
+-- scripts/cabal-inside-nix-shell.sh
+-- scripts/cabal-inside-nix-shell.sh --restore
+-- --------------------------- 8< --------------------------
 -- Please do not put any `source-repository-package` clause above this line.
 
 source-repository-package

scripts/cabal-inside-nix-shell.sh

@@ -1,3 +1,8 @@
 #!/usr/bin/env bash
 
-sed -ni '1,/--- 8< ---/ p' "$(git rev-parse --show-toplevel)"/cabal.project
+case $1 in
+    --exit | --undo | --restore )
+        git checkout HEAD cabal.project;;
+    * )
+        sed -ni '1,/--- 8< ---/ p' "$(git rev-parse --show-toplevel)"/cabal.project
+esac

shell.nix

@@ -50,10 +50,11 @@ let
 
     shellHook = ''
       echo "Setting 'cabal.project' for local builds.."
-      make cabal-setup
+      ./scripts/cabal-inside-nix-shell.sh
+
       function atexit() {
           echo "Reverting 'cabal.project' to the index version.."
-          make cabal-restore
+          ./scripts/cabal-inside-nix-shell.sh --restore
       }
       trap atexit EXIT
     '';