Make PowerShell strictly optional for Git hooks

...and remove auto-`dotnet tool restore`. If you don't have PowerShell
on `$PATH`/`%PATH%`, Git hooks will simply not be ran.
I still intend to migrate the rest of `/Dist` to PowerShell. Undecided
on unmanaged cores and wbox.

Dist/git_hook_shim.sh

@@ -1,5 +1,8 @@
 #!/bin/sh
 set -e
+pwsh="$(command -v pwsh)"
+if [ -z "$pwsh" ]; then pwsh="$(command -v dotnet) pwsh"; fi
+if ! ("$pwsh" -v >/dev/null 2>/dev/null); then exit 0; fi
 kind="$(basename "$0")"
 dotnet pwsh "./Dist/git_hooks/$kind.ps1" "$@"
 if [ -e "./Dist/git_hooks/$kind.local.ps1" ]; then dotnet pwsh "./Dist/git_hooks/$kind.local.ps1" "$@"; fi

Dist/git_hooks/commit-msg.ps1

@@ -1,4 +1,4 @@
-#!/usr/bin/env -S dotnet pwsh
+#!/usr/bin/env -S pwsh
 $msg = Get-Content $args[0] -TotalCount 1 # this commit hook is always passed the commit message scratch file's path, so read the first line of that
 if ($msg -Match "^fix(?:ed|es)? #\d+$") {
 	echo "An issue reference alone is not a suitable commit message. Vetoed."

Dist/install_git_hooks.ps1

@@ -1,3 +1,4 @@
+#!/usr/bin/env pwsh
 $targetDir = "$PSScriptRoot/../.git/hooks"
 if (Test-Path $targetDir -PathType Container) { # is Git repo
 	$PSCommandFilename = Split-Path $PSCommandPath -Leaf

shell.nix

@@ -5,6 +5,7 @@
 , git-cola ? pkgs.git-cola
 , git ? pkgs.gitMinimal
 , nano ? pkgs.nano
+, powershell ? pkgs.powershell
 , debugDotnetHostCrashes ? false # forwarded to Dist/launch-scripts.nix
 , debugPInvokes ? false # forwarded to Dist/launch-scripts.nix
 , forNixOS ? true
@@ -15,7 +16,7 @@
 	# thinking of exposing pre-configured IDEs from `default.nix` so they're available here
 	avail = import ./. { inherit debugDotnetHostCrashes debugPInvokes forNixOS system; };
 	f = drv: mkShell {
-		packages = [ git ]
+		packages = [ git powershell ]
 			++ lib.optionals useNanoAndCola [ git-cola nano ]
 			++ lib.optionals useKate [] #TODO
 			++ lib.optionals useVSCode [] #TODO https://devblogs.microsoft.com/dotnet/csharp-dev-kit-now-generally-available/ https://learn.microsoft.com/en-us/training/modules/implement-visual-studio-code-debugging-tools/

src/BizHawk.Common/BizHawk.Common.csproj

@@ -16,12 +16,8 @@
 	<ItemGroup>
 		<Analyzer Include="$(MSBuildProjectDirectory)/../../References/BizHawk.SrcGen.VersionInfo.dll" />
 	</ItemGroup>
-	<Target Name="RestoreTools" BeforeTargets="PreBuildEvent">
-		<!-- why is this not the default behaviour -->
-		<Exec Command="dotnet tool restore"
-			StandardOutputImportance="low" /> <!-- this parameter has almost no documentation, hooray -->
-	</Target>
 	<Target Name="InstallGitHooks" AfterTargets="PreBuildEvent">
-		<Exec Command="dotnet pwsh $(MSBuildProjectDirectory)/../../Dist/install_git_hooks.ps1" />
+		<Exec Command="$(MSBuildProjectDirectory)/../../Dist/install_git_hooks.ps1"
+			IgnoreExitCode="true" /> <!-- i.e. may fail... though it was actually using the exit code properly, but oh well -->
 	</Target>
 </Project>