This batch script creates an RSS 2.0 XML-file called posts.xml in the current directory, and prompts the user for a message. The message is added to the XML file as a news-feed item. When placed in a Dropbox public folder it can act as a minimal blogging platform, since the feed file can be read with a standard RSS reader application.

mikroblog.bat

@echo OFF
setlocal EnableDelayedExpansion

set "xml_template=^^<?xml version="1.0" encoding="windows-1252"?^^>^^<rss version="2.0"^^>^^<channel^^>^^<title^^>microblog title^^</title^^>^^<description^^>My mikroblog of excellence!^^</description^^>^^</channel^^>^^</rss^^>"

set post_file=posts.xml

if exist %post_file% (
    echo Post database %post_file% found.
) else (
    echo Creating %post_file%...
	echo %xml_template% > %post_file%
	if errorlevel 1 goto db_error
	echo Please edit %post_file% to add custom title and description.
)

goto :ask_message

:ask_message
goto :post_message

:post_message

set command= ^"$a = New-Object System.Globalization.CultureInfo(\"en-US\"); ^
	$message = Read-Host 'New microblog post' ;^
	$d = Get-Date;  ^
	$date = $d.ToString(\"r\", $a); ^
	[xml]$xml = Get-Content %post_file%; ^
	$newpost = $xml.CreateElement(\"item\"); ^
	$content = $xml.CreateElement(\"content\"); ^
	$title = $xml.CreateElement(\"title\"); ^
	$content.AppendChild($xml.CreateTextNode($message)); ^
	$title.AppendChild($xml.CreateTextNode($message)); ^
	$pubDate = $xml.CreateElement(\"pubDate\"); ^
	$pubDate.AppendChild($xml.CreateTextNode($date)); ^
	$newpost.AppendChild($title); ^
	$newpost.AppendChild($pubDate); ^
	$newpost.AppendChild($content); ^
	$xml.rss.channel.PrependChild($newpost); ^
	$result = $xml.Save('%post_file%'); ^
	^"

powershell.exe -NoProfile -Command %command%
if errorlevel 1 goto post_error
echo Message saved successfully.
pause
goto :eof

:db_error
echo Error occured, aborting.
goto :eof

:post_error
echo Error occured when posting, aborting.
goto :eof

:eof
endlocal