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[bash] Support program input with the -c flag #1

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[bash] Support program input with the -c flag #1

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31 changes: 24 additions & 7 deletions bash/bf.bash
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Original file line number Diff line number Diff line change
Expand Up @@ -8,15 +8,32 @@ die()
exit 1
}

if (( $# )); then
if [[ -e $1 ]]; then
program=$(< "$1")
# program comes from -c flag
program=''
while getopts 'c:' flag; do
case $flag in
c)
program=$OPTARG
;;
'?')
exit 1 # usage error occured, and bash printed a diagnostic
;;
esac
done

if test -z "$program"; then # corner case: -c '' gets here
if (( $# )); then
# program comes from filename argument
if [[ -e $1 ]]; then
program=$(< "$1")
else
die "file '$1' does not exist"
fi
else
die "file '$1' does not exist"
# program comes from stdin
mapfile -t
program=${MAPFILE[*]}
fi
else
mapfile -t
program=${MAPFILE[*]}
fi

program=${program//[^'><+-.,[]']}
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