Use dependencies installed using Nix if possible

All development dependencies should be managed using Nix to ensure
reproducibility. For ease of use, the Nix dependencies are implicitly
used by all scripts.

This may cause a noticeable performance hit if Nix is installed. The
dependencies are assumed to be correctly installed if the environment
variable `IN_MINILUA_NIX_SHELL` is set to a non-empty value (`nix-shell`
exports this automatically). Hence, it's recommended to use the default
Nix workflow of developing inside a `nix-shell` to eliminate this
performance overhead.

Note that `shell.nix` was reformatted using `alejandra` (an
uncompromising Nix formatter) to adhere to standard Nix conventions
(e.g. spaces instead of tabs).

scripts/_common.sh

@@ -1,2 +1,4 @@
+source "$(dirname "${BASH_SOURCE[0]}")/_env.sh"
+
 # common variables used by multiple scripts
 FILES=$(find \( -path './build*' -prune -false \) -or \( -path './extern*' -prune -false \) -or -name '*.cpp' -or -name '*.hpp')

scripts/_env.sh

@@ -1,3 +1,9 @@
 #!/usr/bin/env bash
 
 export MAKEFLAGS=-j4
+
+# Install dependencies using Nix, if installed.
+if command -v nix >/dev/null && [ -n "IN_MINILUA_NIX_SHELL" ]
+then
+    . <(nix print-dev-env -f "$(dirname "${BASH_SOURCE[0]}")/../shell.nix")
+fi

scripts/_run_luatest.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+source "$(dirname "${BASH_SOURCE[0]}")/_env.sh"
+
 file="$1"
 
 cmd="build/bin/MiniLua-bin --quiet"

scripts/check_format.sh

@@ -1,5 +1,4 @@
-#!/usr/bin/env nix-shell
-#!nix-shell -i bash --pure ../shell.nix
+#!/usr/bin/env bash
 
 set -evx
 

scripts/format.sh

@@ -1,5 +1,4 @@
-#!/usr/bin/env nix-shell
-#!nix-shell -i bash --pure ../shell.nix
+#!/usr/bin/env bash
 
 DIR=$(dirname "${BASH_SOURCE[0]}")
 source "$DIR/_common.sh"

scripts/hooks/pre-commit

@@ -31,6 +31,8 @@ EOF
     exit 1
 fi
 
+source "$(dirname "${BASH_SOURCE[0]}")/../../scripts/_env.sh"
+
 # Reformat C/C++ files that are part of the commit
 for file in $(git diff --cached --name-only | grep -E '\.(c|h|cpp|hpp)$'); do
     echo "Formatting $file"

scripts/run_luatests.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+source "$(dirname "${BASH_SOURCE[0]}")/_env.sh"
+
 pushd build
 make MiniLua-bin
 popd

scripts/setup_build.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 set -ev
 
+source "$(dirname "${BASH_SOURCE[0]}")/_env.sh"
+
 mkdir -pv build
 pushd build
 

scripts/update_luatest.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+source "$(dirname "${BASH_SOURCE[0]}")/_env.sh"
+
 file="$1"
 
 cmd=build/bin/MiniLua-bin

scripts/upload_coverage.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 set -ev
 
+source "$(dirname "${BASH_SOURCE[0]}")/_env.sh"
+
 pushd build
 bash <(curl -s https://codecov.io/bash) -f coverage.info.cleaned
 popd

shell.nix

@@ -1,17 +1,34 @@
 {
-	sources ? import ./nix/sources.nix,
-	system ? builtins.currentSystem,
-	pkgs ? 
-		import sources.nixpkgs {
-			overlays = [];
-			config = {};
-			inherit system;
-		},
+  sources ? import ./nix/sources.nix,
+  system ? builtins.currentSystem,
+  pkgs ?
+    import sources.nixpkgs {
+      overlays = [];
+      config = {};
+      inherit system;
+    },
 }:
 pkgs.mkShell {
-	nativeBuildInputs = with pkgs; [
-		niv
-		clang-tools 
-		python3
-	];
+  nativeBuildInputs = with pkgs; [
+    # Build tools
+    niv
+    git
+    cmake
+
+    # Dependencies
+    boost
+    qt5.qtbase
+    qt5.qmake
+
+    # Tools
+    clang-tools
+    python3
+    lcov
+    gcovr
+    doxygen
+    which
+    curl
+  ];
+
+  IN_MINILUA_NIX_SHELL = true;
 }