A powershell script to generate web.config from a template

configure.ps1

clear

$template = ".\web.config.template"
$confFile = "web.config"

"`n***********************"
"* Configuration script *"
"*************************"

function askConfirm(){
    $value = Read-Host "Do you want to continue? [Y/n]"
    return (($value.Length -eq 0) -Or ($value.ToString().ToLower() -eq "y")) 
}

$webConfig = New-Object System.Xml.XmlDocument
$webConfig.Load($template)
# Hashtable of appkey to replace
$appKeys = @{
    0="key0";
    1="key1";
    2="key2";
}
# Hashtable of default values to use if no stdin is specified
$defaults = @{
    0="";
    1="default";
    2="";
}
# Hashtable of messages to show before stdin read
$messages = @{
    0="Enter the value for key 1";
    1="Enter the value for key 2 ["+$defaults[1]+"]";
    2="Enter the value for key 3";
}

"`n* App key configuration *"
"* You will be asked some questions to configure your environment."
if (askConfirm) {
    for ($i = 0; $i -lt $appKeys.Count; $i++) {
        # read user input
        $userInput = Read-Host $messages[$i]
        # if user input is empty, the defaults value will be used
        if(($userInput.Trim().Length -eq 0) -And ($defaults[$i].Length -gt 0)) {
            "Using default value '" + $defaults[$i] + "'"
            $userInput = $defaults[$i]
        }
        # Generates new web.config
        $webConfig.SelectSingleNode('configuration/appSettings/add[@key="' + $appKeys[$i] + '"]').Value = $userInput.ToString()
    }
    "`nYour App key configuration was correctly built!"
}
"`nWrite new configuration file"
# Save the file as a web.config
$webConfig.Save($confFile)