Finally make the build.psd1 file optional per #44

Author: Jaykul

Source/Private/GetBuildInfo.ps1

@@ -2,15 +2,7 @@ function GetBuildInfo {
     [CmdletBinding()]
     param(
         # The path to the Build Manifest Build.psd1
-        [Parameter(Mandatory)]
-        [ValidateScript( {
-                if ((Test-Path $_) -and (Split-path -Leaf $_) -eq 'build.psd1') {
-                    $true
-                }
-                else {
-                    throw "The Module Manifest must point to a valid build.psd1 Data file"
-                }
-            })]
+        [Parameter()][AllowNull()]
         [string]$BuildManifest,
 
         # Pass MyInvocation from the Build-Command so we can read parameter values
@@ -19,9 +11,23 @@ function GetBuildInfo {
         $BuildCommandInvocation
     )
 
-    # Read the Module Manifest configuration file for default parameter values
-    Write-Debug "Load Build Manifest $BuildManifest"
-    $BuildInfo = Import-Metadata -Path $BuildManifest
+    $BuildInfo = if ($BuildManifest -and (Test-Path $BuildManifest)) {
+        if ((Split-path -Leaf $BuildManifest) -eq 'build.psd1') {
+            $BuildManifestParent = if ($BuildManifest) {
+                Split-Path -Parent $BuildManifest
+            } else {
+                Get-Location -PSProvider FileSystem
+            }
+            # Read the Module Manifest configuration file for default parameter values
+            Write-Debug "Load Build Manifest $BuildManifest"
+            Import-Metadata -Path $BuildManifest
+        } else {
+            @{ SourcePath = $BuildManifest }
+        }
+    } else {
+        @{}
+    }
+
     $CommonParameters = [System.Management.Automation.Cmdlet]::CommonParameters +
                         [System.Management.Automation.Cmdlet]::OptionalCommonParameters
     $BuildParameters = $BuildCommandInvocation.MyCommand.Parameters
@@ -71,9 +77,6 @@ function GetBuildInfo {
 
     $BuildInfo = $BuildInfo | Update-Object $ParameterValues
 
-    # Resolve Build Manifest's parent folder to find the Absolute path
-    $BuildManifestParent = (Split-Path -Parent $BuildManifest)
-
     # Resolve Module manifest if not defined in Build.psd1
     if (-Not $BuildInfo.SourcePath -and $BuildManifestParent) {
         # Resolve Build Manifest's parent folder to find the Absolute path

Source/Private/ResolveBuildManifest.ps1

@@ -9,7 +9,7 @@ function ResolveBuildManifest {
     if ((Split-Path $SourcePath -Leaf) -eq 'build.psd1') {
         $BuildManifest = $SourcePath
     } elseif (Test-Path $SourcePath -PathType Leaf) {
-        # When you pass the ModuleManifest as parameter, you must have the Build Manifest in the same folder
+        # When you pass the SourcePath as parameter, you must have the Build Manifest in the same folder
         $BuildManifest = Join-Path (Split-Path -Parent $SourcePath) [Bb]uild.psd1
     } else {
         # It's a container, assume the Build Manifest is directly under
@@ -19,9 +19,7 @@ function ResolveBuildManifest {
     # Make sure we are resolving the absolute path to the manifest, and test it exists
     $ResolvedBuildManifest = (Resolve-Path $BuildManifest -ErrorAction SilentlyContinue).Path
 
-    if (-Not ($ResolvedBuildManifest)) {
-        throw "Couldn't resolve the Build Manifest at $BuildManifest"
-    } else {
+    if ($ResolvedBuildManifest) {
         $ResolvedBuildManifest
     }
 

Tests/Integration/Source1.Tests.ps1

@@ -86,6 +86,39 @@ Describe "Build-Module With Source1" {
         It "Should update AliasesToExport in the manifest" {
             $Metadata.AliasesToExport | Should -Be @("GS","GSou", "SS", "SSou")
         }
+    }
+
+    Context "Supports building without a build.psd1" {
+        Copy-Item  $PSScriptRoot\Source1 $PSScriptRoot\Copy1 -Recurse
+        Remove-Item $PSScriptRoot\Copy1\build.psd1
+        Rename-Item $PSScriptRoot\Copy1\Source1.psd1 Copy1.psd1
+
+        $Build = @{ }
+
+        It "No longer fails if there's no build.psd1" {
+            $BuildParameters = @{
+                SourcePath               = "$PSScriptRoot\Copy1\Copy1.psd1"
+                OutputDirectory          = "..\Result1"
+                VersionedOutputDirectory = $true
+            }
+
+            $Build.Output = Build-Module @BuildParameters -Passthru
+        }
+
+        Remove-Item -Recurse $PSScriptRoot\Copy1
+
+
+        It "Creates the same module as with a build.psd1" {
+            $Build.Metadata = Import-Metadata $Build.Output.Path
+        }
+
+        It "Should update AliasesToExport in the manifest" {
+            $Build.Metadata.AliasesToExport | Should -Be @("GS", "GSou", "SS", "SSou")
+        }
+
+        It "Should update FunctionsToExport in the manifest" {
+            $Build.Metadata.FunctionsToExport | Should -Be @("Get-Source", "Set-Source")
+        }
 
     }
 }