Import-Carbon.ps1

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<#
.SYNOPSIS
Imports the Carbon module.
 
.DESCRIPTION
Intelligently imports the Carbon module, re-importing it if needed. Carbon will be re-imported if:
 
 * a different version is currently loaded
 * any of Carbon's files were modified since it was last imported with this script
 * the `Force` switch is set
 
.EXAMPLE
Import-Carbon.ps1
 
Imports the Carbon module, re-loading it if its already loaded.
#>


# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

[CmdletBinding(SupportsShouldProcess=$true)]
param(
    [Parameter()]
    [string]
    # The prefix to use on all the module's functions, cmdlets, etc.
    $Prefix,

    [Switch]
    # Reload the module no matter what.
    $Force
)

#Requires -Version 4
Set-StrictMode -Version 'Latest'

$carbonPsd1Path = Join-Path -Path $PSScriptRoot -ChildPath 'Carbon.psd1' -Resolve

$startedAt = Get-Date
$loadedModule = Get-Module -Name 'Carbon'
if( $loadedModule )
{
    $importedAt = $loadedModule | Select-Object -ExpandProperty 'ImportedAt' -ErrorAction Ignore
    if( -not $Force -and $importedAt )
    {
        $newFiles = Get-ChildItem -Path $PSScriptRoot -File -Recurse |
                        Where-Object { $_.LastWriteTime -gt $importedAt }
        if( $newFiles )
        {
            Write-Verbose -Message ('Reloading Carbon module. The following files were modified since {0}:{1} * {2}' -f $importedAt,([Environment]::NewLine),($newFiles -join ('{0} * ' -f ([Environment]::NewLine))))
            $Force = $true
        }
    }

    $thisModuleManifest = Test-ModuleManifest -Path $carbonPsd1Path
    if( $thisModuleManifest )
    {
        if( -not $Force -and $thisModuleManifest.Version -ne $loadedModule.Version )
        {
            Write-Verbose -Message ('Reloading Carbon module. Module from {0} at version {1} not equal to module from {2} at version {3}.' -f $loadedModule.ModuleBase,$loadedModule.Version,(Split-Path -Parent -Path $thisModuleManifest.Path),$thisModuleManifest.Version)
            $Force = $true
        }
    }
}
else
{
    $Force = $true
}

if( -not $Force )
{
    return
}

$importModuleParams = @{ }
if( $Prefix )
{
    $importModuleParams.Prefix = $Prefix
}

Write-Verbose -Message ('Importing Carbon ({0}).' -f $carbonPsd1Path)
& {
    $originalVerbosePreference = $Global:VerbosePreference
    $Global:VerbosePreference = [Management.Automation.ActionPreference]::SilentlyContinue
    try 
    {
        if( $Force -and $loadedModule )
        {
            # Remove so we don't get errors about conflicting type data.
            Remove-Module -Name 'Carbon' -WhatIf:$false
        }

        Import-Module $carbonPsd1Path -ErrorAction Stop @importModuleParams
    }
    finally
    {
        $Global:VerbosePreference = $originalVerbosePreference
    }
}

if( -not (Get-Module -Name 'Carbon' | Get-Member -Name 'ImportedAt') )
{
    Get-Module -Name 'Carbon' | Add-Member -MemberType NoteProperty -Name 'ImportedAt' -Value (Get-Date)
}

if( $Force )
{
    $loadedModule = Get-Module -Name 'Carbon'
    $loadedModule.ImportedAt = Get-Date
}