Updated build scripts to latest setup used with HandmadeHero repo

scripts/helpers/incremental_checks.ps1

@@ -0,0 +1,73 @@
+# This is meant to be used with build.ps1, and is not a standalone script.
+
+function check-FileForChanges
+{
+    param(
+        [Parameter(Mandatory=$true)]
+        [string]$path_file
+    )
+
+    if (-not (Test-Path $path_file -PathType Leaf)) {
+        Write-Error "The provided path is not a valid file: $path_file"
+        return $false
+    }
+    $file_name = Split-Path $path_file -Leaf
+    $path_csv  = Join-Path $path_build ($file_name + "_file_hash.csv")
+
+    $csv_file_hash = $null
+    if (Test-Path $path_csv) {
+        $csv_file_hash = Import-Csv $path_csv | Select-Object -ExpandProperty value
+    }
+
+    $current_hash_info = Get-FileHash -Path $path_file -Algorithm MD5
+    $current_file_hash = $current_hash_info.Hash
+
+    # Save the current hash to the CSV
+    [PSCustomObject]@{
+        name  = $path_file
+        value = $current_file_hash
+    } | Export-Csv $path_csv -NoTypeInformation
+
+    if ($csv_file_hash -and $csv_file_hash -eq $current_file_hash) {
+        return $false
+    } else {
+        return $true
+    }
+}
+
+# Check to see if the module has changed files since the last build
+function check-ModuleForChanges
+{
+	param( [string]$path_module, [array]$excludes )
+
+	$module_name = split-path $path_module -leaf
+	$path_csv    = Join-Path $path_build ($module_name + "_module_hashes.csv")
+
+	$csv_file_hashes = $null
+	if ( test-path $path_csv ) {
+		$csv_file_hashes = @{}
+		import-csv $path_csv | foreach-object {
+			$csv_file_hashes[ $_.name ] = $_.value
+		}
+	}
+
+	$file_hashes = @{}
+	get-childitem -path $path_module -recurse -file -Exclude $excludes | foreach-object {
+		$id                 = $_.fullname
+		$hash_info          = get-filehash -path $id -Algorithm MD5
+		$file_hashes[ $id ] = $hash_info.Hash
+	}
+
+	$file_hashes.GetEnumerator() | foreach-object { [PSCustomObject]$_ } |
+		export-csv $path_csv -NoTypeInformation
+
+	if ( -not $csv_file_hashes )                         { return $true }
+	if ( $csv_file_hashes.Count -ne $file_hashes.Count ) { return $true }
+
+	foreach ( $key in $csv_file_hashes.Keys ) {
+		if ( $csv_file_hashes[ $key ] -ne $file_hashes[ $key ] ) {
+			return $true
+		}
+	}
+	return $false
+}