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#!/bin/bash
# Copyright (C) 2011-2014 Luke Shumaker <lukeshu@lukeshu.com>
# Basically run getopt(1) with arguments that reflect wdiff(1)'s usage
# Except for -d|--diff-input, chardiff doesn't support that.
wdiff_getopt() {
declare ifs="$IFS"
IFS=$'\n'
declare -a wdiff_flags
wdiff_flags=($(
LC_ALL=C wdiff --help |
sed -rn 's/^ (-.*\S)\s\s.*/\1/p' |
grep -v diff-input |
sed -r \
-e '/=/{ s/, /:\n/g; s/=.*/:/ }' \
-e '/^[^=]*$/{ s/, /\n/g }'))
declare -a flags_o flags_l
flags_o=($(printf -- '%s\n' "${wdiff_flags[@]}"|sed -rn 's/^-([^-])/\1/p'))
flags_l=($(printf -- '%s\n' "${wdiff_flags[@]}"|sed -n 's/^--//p'))
declare o l
IFS='' o="${flags_o[*]}"
IFS=',' l="${flags_l[*]}"
IFS=$ifs
declare args
args="$(getopt -n "$0" -o "$o" -l "$l" -- "$@")" || return 1
# Check the number of file arguments
eval set -- "$args"
while true; do
case "$1" in
-C|--copyright|-h|--help|-v|--version)
printf -- '%s' "$1"; return;;
--) shift; break;;
*) shift;;
esac
done
if [[ $# -lt 2 ]]; then
printf -- '%s: %s\n' "$0" "$(gettext 'missing file arguments')" >&2
return 1
elif [[ $# -gt 2 ]]; then
printf -- '%s: %s\n' "$0" "$(gettext 'too many file arguments')" >&2
return 1
fi
# Return the result
printf -- '%s' "$args"
}
main() {
# Normalize the arguments
declare flags
if ! flags="$(wdiff_getopt "$@")"; then
printf "$(gettext 'Try `%s'\'' for my information.\n')" "${0##*/} --help" >&2
return 2
fi
eval set -- "$flags"
case "$1" in
-C|--copyright)
wdiff --copyright
return
;;
-h|--help)
printf "$(gettext 'chardiff - Compares characters in two files and report differences.\n')"
wdiff --help | sed -e 1d -e '/\s-d\b/d' -e /diff-input/d -e '/@gnu\.org/d' -e "s/wdiff/${0##*/}/g"
printf "$(gettext 'Report bugs to <lukeshu@lukeshu.com>.\n')"
return 0
;;
-v|--version)
printf "$(gettext 'chardiff (thingutils chardiff) %s\n')" 0
printf "$(gettext 'Using:\n')"
wdiff --version
return 0
;;
esac
# Run wdiff with our filters
declare -a args=("$@")
declare file2=${args[-1]}; unset args[-1]
declare file1=${args[-1]}; unset args[-1]
set -o pipefail
wdiff "${args[@]}" \
<(chardiff_pre <"$file1") \
<(chardiff_pre <"$file2") \
| chardiff_post
}
main "$@"
|
