chktex pre-commit hook for git

pre-commit

#!/bin/sh
# Run chktex on 'report.tex'. Notice that this does not only test the staged files due
# to the recursive nature of chktex, but everything referenced by 'report.tex'.
# The chktex exit code cannot be used to distinguish a
# well formatted LaTeX document and a bad-formatted document, so we do that by grepping
# warings in the output. If the word "warning" has been written to the output, the output
# is printed to stdout. Also remove some chktex warnings of the form "chktex: WARNING --".
BODY=$(
    output="$(chktex -q -V report.tex 2>&1 | grep -v 'chktex: WARNING --')";
    warn=$(echo $output | grep Warning);
    if [ "$warn" ] ;
        then echo "$output" ;
    fi
)
if [ -n "$BODY" ]
   then
   echo "$BODY"
   echo "------\nPlease fix the errors before committing!"
   exit 1
else exit 0
fi