NuGet PowerShell寫作練習--天氣查詢

param($installPath, $toolsPath, $package)

Import-Module (Join-Path $toolsPath GoogleWeather.psm1)

#加上自動完成之提示項目

Register-TabExpansion "Get-Weather" @{ 

    'city' = { "台北市", "台中市", "高雄市" }

}    

#由XML節點取出data Attribute的小函數

function GetData($node, [string]$name) 

{

    $data = $node.SelectSingleNode($name)

    if ($data) {

        return $data.GetAttribute("data")

    } else {

        return "N/A"

    }

}

#天氣資訊查詢函數

function Get-Weather($city) {

    #建立WebClient物件

    $wc = New-Object System.Net.WebClient

    #帶入城市組成URL取得XML

    $url = "http://www.google.com/ig/api?hl=zh-TW&weather=" + $city

    $result = $wc.DownloadString($url)

    $xml = ([Xml]$result).xml_api_reply

    $info = $xml.weather.forecast_information

    #解析XML取出天氣資訊，進行簡單的排版

    if ($info -eq $null) 

    {

        "目前沒有" + $city + "的氣象資訊"

        return

    }

    $display = "=== " + $(GetData $info "forecast_date") 

    $display +=  " " + $(GetData $info "city") + "氣象資訊 ============`n"

    $curr = $xml.weather.current_conditions

    $display += "現在天氣：" + $(GetData $curr "condition") + "`n"

    $display += "氣溫：" + $(GetData $curr "temp_c") + "   "

    $display += $(GetData $curr "humidity") + "`n"

    $wind = GetData $curr "wind_condition"

    if ($wind -ne "N/A") { $display += $wind + "`n" }

    $display += "============================================`n"

    $xml.weather.SelectNodes("//forecast_conditions") | ForEach-Object {

        $display += $(GetData $_ "day_of_week") + " "

        $display += $(GetData $_ "low") + " - " + $(GetData $_ "high")

        $display += "  /  " + $(GetData $_ "condition") + "`n"

    }

    $display                

}

#註冊Get-Weather，以便在NuGet Console中呼叫

Export-ModuleMember Get-Weather