Build etags from javascript files including names exposed using global namespace convention and properties assigned to prototype

jstags.sh

#!/usr/bin/env sh

SYMBOL="[a-zA-Z_][a-zA-Z0-9_]*"
CAP_SYMBOL="[A-Z][a-zA-Z0-9_]*"
GLOB_SYMBOL="${CAP_SYMBOL}\(\.${SYMBOL}\)*"

if [ -z "$1" ]; then
    echo "You need to provide at list one path where to search for js files" 1>&2
    exit 1
fi

find ${@} -name *.js -print | etags \
   --regex="/[ \t]*prototype\.\(${SYMBOL}\) *=/\1/" \
   --regex="/[ \t]*${GLOB_SYMBOL}\.\(${SYMBOL}\) *=/\2/" \
   -