BEGIN {}

function getTag()
{
	tag = gensub(/^ *<([a-zA-Z]+).*/,"\\1","g",$0)
	t = $0
	# </tag> may not be on the same line - read as many as needed
	while ((index(t,"</" tag ">") == 0) && (match(t,"/> *$") == 0))
	{
		if (getline > 0)
			t = t "\n" $0;
		else
			break;
	}
	#t = gensub("^ *<" tag "[^>]*>","","g",t)
	#t = gensub("</" tag ">","","g",t)
	return t
}

# scan the file
# ----------------------------------------------------------------------

(FNR == 1) {
	part = 0
 }

/^ +<programVersion>(.*)<\/programVersion>/ {
	programVersion = gensub(/(.*<programVersion>)(.*)(<\/programVersion>.*)/,"\\2","g")
	if (substr(programVersion,1,2) != "2.") {
		print "FATAL: only scores created with MuseScore version 2.x are supported: " FILENAME > "/dev/stderr"
		exit
	}
}


/^ *<Part>/ {
	Part = 1
}

	/^ *<Staff id="[0-9]+">/ {
		StaffId = gensub(/^[^"]+"([0-9]+)".*$/,"\\1","g",$0)
	}

	/^ *<show>[0-9]+<\/show>/ && (Part == 1) {
		# remove the tag := set the visibility to yes
		getTag()
		next
	}
	
	/^ *<Instrument>/ && (Part == 1) {
		Instrument = 1
	}

		/^ *<Channel>/ && (Instrument == 1) {
			Channel = 1
		}

			/^ *<controller ctrl="[0-9]+" value="[0-9]+"\/>/ && (Channel == 1) {
				# remove the tag := populate in the second pass
				getTag()
				next
			}
		
			/^ *<mute>[0-9]<\/mute>/ && (Channel == 1) {
				# remove the tag := populate in the second pass
				getTag()
				next
			}
		
			/^ *<solo>[0-9]<\/solo>/ && (Channel == 1) {
				# remove the tag := populate in the second pass
				getTag()
				next
			}
		/^ *<\/Channel>/ && (Instrument == 1) {
			Channel = 0
		}
	/^ *<\/Instrument>/ && (Part == 1) {
		Instrument = 0
		Channel = 0
	}
	

/^ *<\/Part>/ {
	Part = 0
}

{ print }

END {}