fix(pwsh): print upgrade notice in UTF8

resolves #3606

src/cli/notice.go

@@ -0,0 +1,34 @@
+package cli
+
+import (
+	"fmt"
+
+	"github.com/jandedobbeleer/oh-my-posh/src/platform"
+	"github.com/jandedobbeleer/oh-my-posh/src/upgrade"
+	"github.com/spf13/cobra"
+)
+
+// noticeCmd represents the get command
+var noticeCmd = &cobra.Command{
+	Use:   "notice",
+	Short: "Print the upgrade notice when a new version is available.",
+	Long:  "Print the upgrade notice when a new version is available.",
+	Args:  cobra.NoArgs,
+	Run: func(cmd *cobra.Command, args []string) {
+		env := &platform.Shell{
+			CmdFlags: &platform.Flags{
+				Version: cliVersion,
+			},
+		}
+		env.Init()
+		defer env.Close()
+
+		if notice, hasNotice := upgrade.Notice(env); hasNotice {
+			fmt.Println(notice)
+		}
+	},
+}
+
+func init() { //nolint:gochecknoinits
+	RootCmd.AddCommand(noticeCmd)
+}

src/shell/init.go

@@ -210,7 +210,12 @@ func PrintInit(env platform.Environment) string {
 
 	shell := env.Flags().Shell
 	configFile := env.Flags().Config
-	var script string
+
+	var (
+		script, notice string
+		hasNotice      bool
+	)
+
 	switch shell {
 	case PWSH, PWSH5:
 		executable = quotePwshStr(executable)
@@ -251,7 +256,13 @@ func PrintInit(env platform.Environment) string {
 	default:
 		return fmt.Sprintf("echo \"No initialization script available for %s\"", shell)
 	}
-	notice, hasNotice := upgrade.Notice(env)
+
+	// only run this for shells that support
+	// injecting the notice directly
+	if shell != PWSH && shell != PWSH5 {
+		notice, hasNotice = upgrade.Notice(env)
+	}
+
 	return strings.NewReplacer(
 		"::OMP::", executable,
 		"::CONFIG::", configFile,

src/shell/scripts/omp.ps1

@@ -30,11 +30,6 @@ New-Module -Name "oh-my-posh-core" -ScriptBlock {
         $env:POSH_THEME = (Resolve-Path -Path ::CONFIG::).ProviderPath
     }
 
-    # print upgrade notice
-    if ("::UPGRADE::" -eq "true") {
-        Write-Host "::UPGRADENOTICE::"
-    }
-
     # specific module support (disabled by default)
     if (($null -eq $env:POSH_GIT_ENABLED) -or ($null -eq (Get-Module 'posh-git'))) {
         $env:POSH_GIT_ENABLED = $false
@@ -404,6 +399,11 @@ Example:
         }
     }
 
+    $notice = @(Start-Utf8Process $script:OMPExecutable @("notice"))
+    if ($notice) {
+        Write-Host $notice -NoNewline
+    }
+
     Export-ModuleMember -Function @(
         "Set-PoshContext"
         "Enable-PoshTooltips"