feat: Allow configuring PowerShell preference variables

chore: Change default VerbosePreference to SilentlyContinue

Author: z-Fng

README.md

@@ -25,6 +25,14 @@ Set of automated actions, which bucket maintainers can use to save time managing
 1. `SPECIAL_SNOWFLAKES`
     - String
     - List of manifest names joined with `,` used as parameter for auto-pr utility.
+1. [PowerShell Preference Variables](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_preference_variables)
+    - If an environment variable with the same name as the following PowerShell preference variable exists, its value will be assigned to the corresponding PowerShell preference variable:
+    | Name                                                         | Type   | Default Value        |
+    | ------------------------------------------------------------ | ------ | -------------------- |
+    | [DebugPreference](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_preference_variables?view=powershell-7.5#debugpreference) | String | `'SilentlyContinue'` |
+    | [InformationPreference](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_preference_variables?view=powershell-7.5#informationpreference) | String | `'SilentlyContinue'` |
+    | [VerbosePreference](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_preference_variables?view=powershell-7.5#verbosepreference) | String | `'SilentlyContinue'` |
+    | [WarningPreference](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_preference_variables?view=powershell-7.5#warningpreference) | String | `'Continue'`         |
 
 ## Available actions
 

action.ps1

@@ -1,7 +1,3 @@
-# Set Global Preference
-$Global:ErrorActionPreference = 'Continue'
-$Global:VerbosePreference = 'Continue'
-
 # Import all modules
 Join-Path $PSScriptRoot 'src' | Get-ChildItem -File | Select-Object -ExpandProperty Fullname | Import-Module
 

src/Variables.psm1

@@ -1,3 +1,37 @@
+function Initialize-PreferenceVariable {
+    <#
+    .SYNOPSIS
+        Initializes PowerShell preference variables based on environment variables or default values.
+    #>
+
+    $DefaultPreferences = [ordered]@{
+        ErrorActionPreference = @{ Value = 'Continue'; IgnoreEnv = $true } # Prevent changing ErrorActionPreference from env
+        DebugPreference       = @{ Value = 'SilentlyContinue' }
+        InformationPreference = @{ Value = 'SilentlyContinue' }
+        VerbosePreference     = @{ Value = 'SilentlyContinue' }
+        WarningPreference     = @{ Value = 'Continue' }
+    }
+
+    foreach ($Name in $DefaultPreferences.Keys) {
+        $Preferences = $DefaultPreferences[$Name]
+        $Value = $Preferences.Value
+
+        $EnvValue = Get-Item "Env:$Name" -ErrorAction SilentlyContinue | Select-Object -ExpandProperty Value
+
+        if ((-not $Preferences.IgnoreEnv) -and ($EnvValue)) {
+            $Value = $EnvValue
+        }
+
+        # Use built-in output functions instead of Write-Log here to avoid dependency issues
+        Write-Host "Setting $Name to $Value ..."
+
+        Set-Variable -Name $Name -Value $Value -Scope Global
+    }
+}
+
+# Initialize PowerShell Preference Variables
+Initialize-PreferenceVariable
+
 # Environment
 $env:SCOOP = Join-Path $env:USERPROFILE 'SCOOP'
 $env:SCOOP_HOME = Join-Path $env:SCOOP 'apps\scoop\current'