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#!/bin/sh
#
# Check for variable ($1) being set or used in scripts ($2 ...)
#
# Note that the script uses shallow parsing of the shell script files,
# so does not understand comments, strings, backquotes or fragments of
# perl/awk/sed/<<documents/... embedded in the scripts; this can lead
# to some false matches.
#
# Copyright (c) 2022 Ken McDonell. All Rights Reserved.
#
if [ $# -lt 2 ]
then
echo "Usage: $0 variable file ..."
exit 1
fi
name=$1
shift
tmp=/var/tmp/var-use-$$
trap "rm -f $tmp.*; exit 0" 0 1 2 3 15
for script
do
sed <$script >$tmp.out \
-e 's/^/ /' \
-e 's/$/ /' \
-e "/\\\$$name[^a-zA-Z0-9_]/s/^/U/" \
-e "/\\\${$name[^a-zA-Z0-9_]/s/^/U/" \
-e "/[ ;(]$name=/s/^/S/" \
-e "/[ ;]read $name /s/^/S/" \
-e "/[ ;]read [^;|()]* $name /s/^/S/" \
-e "/[ ;]for[ ][ ]*$name[ ;]/s/^/S/" \
# end
#debug# grep '^[SU]' $tmp.out
if grep '^[^ ]*S' $tmp.out >/dev/null
then
state='set'
else
state=''
fi
if grep '^[^ ]*U' $tmp.out >/dev/null
then
if [ -n "$state" ]
then
state='set and used'
else
state='used'
fi
fi
echo "$script: $state"
done
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