Custom PSmodule sample to load command defined separated files using dot-sourcing.

PSModuleLoading.psm1

#Write-Host "Load script files..." -ForegroundColor DarkGray

$scriptFiles = Get-ChildItem "$PSScriptRoot\*.ps1" -Exclude "*.Tests.ps1" -Recurse
foreach ($script in $scriptFiles)
{
    #Write-Host "`tLoad script:" $script.Name -ForegroundColor DarkGray
    try
    {
        #TODO: Suppress $Error entry recorded after module loading completed(can't suppress inside psm1 module?)
        . $script.FullName
    }
    catch [Management.Automation.ScriptRequiresException]
    {
        $errorRecord = $_
        $exception = $errorRecord.Exception

        switch ($errorRecord.FullyQualifiedErrorId)
        {
            "ScriptRequiresElevation"{
                Write-Warning ("`tSkip Load script: {0,-30}(Require runas administrator)" -f $script.Name)
            }
            "ScriptRequiresMissingModules"{
                Write-Warning ("`tSkip Load script: {0,-30}(Require missing modules: {1})" -f $script.Name, $exception.MissingPSSnapIns[0])
            }
            "ScriptRequiresMissingPSSnapIns"{
                Write-Warning ("`tSkip Load script: {0,-30}(Require PSSnapin: {1})" -f $script.Name, $exception.MissingPSSnapIns[0])
            }
            "ScriptRequiresUnmatchedPSVersion"{
                Write-Warning ("`tSkip Load script: {0,-30}(Require PowerShell version: {1})" -f $script.Name, $exception.RequiresPSVersion)
            }
            "RequiresShellIDInvalidForSingleShell"{
                Write-Warning ("`tSkip Load script: {0,-30}(Require PowerShell host ShellID: {1})" -f $script.Name, $exception.RequiresShellId)
            }
            default{
                throw
            }
        }
    }
}

#TODO:Export only public members that match specific criteria.
#Export-ModuleMember -Function * -Alias * -Cmdlet * -Variable *