Commandline xpath query

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-- *
-- xpath query using xmllint shell mode. This method throws the xpath query at xmllint using an echo
-- statement. Since this tool lives on tiger as well as leopard it is a relatively 'safe' method of
-- running an xpath query from applescript. Currently this method only works on queries that select
-- a single node!
-- The result of the shellCommand is trimmed and set to an empty string if the result started with the
-- query (which indicates it failed or multiple nodes were part of the selection).
-- For the idea of creating this method I would refer to: http://uszla.me.uk/space/blog/2007/09/21
--
-- @parameter query A String containing the xpath query you want to use
-- @parameter source A String containing the xml, or a POSIX path to the xml-file you want to query
-- @parameter fromFile A class set to 'file' if the source is a file, otherwise a file is create and source is stored in that file.
-- */
on xpath for query against source from fromFile
	set shellPipe to "|"
	set shellEcho to "echo \"cd " & query & NL & "cat\""
	set shellCommand to "/usr/bin/xmllint --noent --shell "
	set shellCleanup to "sed 's/^[/a-zA-Z][^<]*>//g'"
	set shellCaptureError to " 2>&1" -- For capturing the errorout
	
	-- If source is not from a file, create a temp file...	
	if fromFile is file then
		set filePath to quoted form of POSIX path of source
	else
		set theFilePath to TEMP_FILE
		set filePath to quoted form of POSIX path of theFilePath
		try
			do shell script "/bin/rm " & filePath
		on error
			--Ignore it, no need to worry...
		end try
		set theFileReference to open for access theFilePath with write permission
		write source to theFileReference
		close access theFileReference
	end if
	
	set shellScript to (shellEcho & shellPipe & shellCommand & filePath & shellCaptureError & shellPipe & shellCleanup)
	set shellResult to (do shell script shellScript)
	
	--If the result starts with the query, something went wrong...
	if (shellResult contains query) then
		-- display dialog (shellScript & NL & "'" & trim(true, shellResult) & "'")
		set shellResult to ""
	else
		set shellResult to trim(true, shellResult)
	end if
	
	return shellResult
end xpath
                                              

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