Branch switching script

gistfile1.ps1

#
# The script switches IIS web applications to point to some other directory. It is very usefull when frequently changing branches.
# The script assumes SVN-ish branch structure like this:
# Root
#  |
#  |--Branches
#  |   |
#  |   |--Branch 1
#  |   |
#  |   \--Branch 2
#  |
#  \--Trunk
#      |
#      |--First.Web.Project
#      |
#      \--Second.Web.Project
#
# The list of web projects to use is provided via 'webapps.txt' file with following structure:
# app;dir
# webapp1;First.Web.Project
# webapp2;Second.Web.Project
#

param (
    [string]$Root = $(Throw "Source code root folder not specified"),    
    [string]$Branch = $(Throw "Branch not specified")
)

$websites = Import-Csv "webapps.txt" -Delimiter ";"

function Execute-Cmd([string]$source, [string]$command, [string]$message) {          
    Write-Host "${message}..." -NoNewline   
    Write-Debug "${source}: ${command}"
    $output = cmd.exe /C $command
    if ($?) {
        Write-Host "OK"
    } else {
        Write-Host "Failed"        
        throw "Failed ${message}"
    }
}

if ($Branch -eq "Trunk") {
    $root_dir = "${Root}\Code\Trunk\"
} else {
    $root_dir = "${Root}\Code\Branches\${Branch}\"
}

$websites | ForEach-Object {
    $dir = $_.dir
    $app = $_.app
    $work_dir = $root_dir + $dir
    $params = "set app `"Default Web Site/$app`" -[path='/'].physicalpath:`"${work_dir}`""
    $command = "$env:SystemRoot\system32\inetsrv\appcmd $params"
    $message = "Switching working directory of $app to $work_dir"
    Execute-Cmd "APPCMD" $command $message
}