Build Path Cleanup

build-tool.ps1

@@ -7,4 +7,35 @@ Set-Location $repoRoot
 $env:GOCACHE = Join-Path $repoRoot ".cache/go-build"
 $outputPath = Join-Path $repoRoot "tools/sow-toolkit.exe"
 
+function Test-ToolSourcesAreNewer {
+    if (-not (Test-Path $outputPath)) {
+        return $true
+    }
+
+    $outputTime = (Get-Item -LiteralPath $outputPath).LastWriteTimeUtc
+    $sourcePaths = @("go.mod", "go.sum", "cmd", "internal")
+    foreach ($sourcePath in $sourcePaths) {
+        $fullPath = Join-Path $repoRoot $sourcePath
+        if (-not (Test-Path $fullPath)) {
+            continue
+        }
+        $newerSource = Get-ChildItem -LiteralPath $fullPath -Recurse -File |
+            Where-Object { $_.LastWriteTimeUtc -gt $outputTime } |
+            Select-Object -First 1
+        if ($newerSource) {
+            return $true
+        }
+    }
+
+    return $false
+}
+
+New-Item -ItemType Directory -Force -Path (Join-Path $repoRoot "tools") | Out-Null
+New-Item -ItemType Directory -Force -Path $env:GOCACHE | Out-Null
+if (-not (Test-ToolSourcesAreNewer)) {
+    Write-Host "sow-toolkit is up to date."
+    exit 0
+}
+
+Write-Host "Building sow-toolkit..."
 go build -o $outputPath ./cmd/nwn-tool