Run preferred syntax checker for each file type.

tidy_by_type.sh

#!/bin/sh
# [Gedit Tool]
# Save-files=document
# Shortcut=<Primary><Shift>bar
# Output=replace-document
# Name=Tidy by filetype
# Applicability=all
# Input=document


if [ $GEDIT_CURRENT_DOCUMENT_TYPE = "text/x-python" ]; then
    autopep8 - -v -a
    pylint  $GEDIT_CURRENT_DOCUMENT_NAME -r no > /dev/stderr
elif [ $GEDIT_CURRENT_DOCUMENT_TYPE = "text/html" ]; then 
    #-i auto indents, -w 80 wrap at 80 chars, -c replace font tags w/CSS
    exec tidy -utf8 -i -w 100 -c "$GEDIT_CURRENT_DOCUMENT_NAME"
    echo "Tidying." > /dev/stderr
#elif [ $GEDIT_CURRENT_DOCUMENT_TYPE = "text/css" ]; then
    # TK: CSS Tidy
#elif [ $GEDIT_CURRENT_DOCUMENT_TYPE = "application/javascript" ]; then
    # TK: JS Lint
else 
    #cat $GEDIT_CURRENT_DOCUMENT_NAME, then trim the blank line it added
    cat -
    sed -i '${/^$/d;}'
    echo "This seems to be " $GEDIT_CURRENT_DOCUMENT_TYPE " I don't know how to tidy that. ..." > /dev/stderr
fi