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# Eggshell Compiler entry point
#
# Copyright (C) 2016 Patrick "P. J." McDermott
#
# This file is part of the Eggshell Compiler.
#
# The Eggshell Compiler is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 3 of
# the License, or (at your option) any later version.
#
# The Eggshell Compiler is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the Eggshell Compiler. If not, see
# <http://www.gnu.org/licenses/>.
set -u
usage()
{
printf 'Usage: %s [-o <output>] <input>...\n' "${0}"
}
version()
{
cat <<EOF
eshtrans 0.1.0
Copyright (C) 2016 Patrick "P. J." McDermott
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
EOF
}
err()
{
local fmt="${1}"
shift 1
printf "eshtrans: Error: ${fmt}\n" "${@}"
}
main()
{
local opt=
local input=
local output=
output=''
unset OPTARG
while getopts 'V:o:' opt; do
case "${opt}" in
'V')
version
exit
;;
'o')
output="${OPTARG}"
;;
'?')
usage >&2
return 1
;;
esac
unset OPTARG
done
shift $(($OPTIND - 1))
if [ ${#} -eq 0 ]; then
err 'No input files'
return 1
fi
if [ "x${output}" = 'x' ]; then
for input in "${@}"; do
output="${input%.esh}.sh"
contents="$(cat "${input}"; printf '.')"
contents="${contents%.}"
sh_codegen "$(esh_parse "${input}" "${contents}")" \
>"${output}"
done
else
if [ ${#} -gt 1 ]; then
err 'Cannot specify -o with multiple input files'
return 1
fi
input="${1}"
if [ "x${output}" = 'x-' ]; then
contents="$(cat "${input}"; printf '.')"
contents="${contents%.}"
sh_codegen "$(esh_parse "${input}" "${contents}")"
else
contents="$(cat "${input}"; printf '.')"
contents="${contents%.}"
sh_codegen "$(esh_parse "${input}" "${contents}")" \
>"${output}"
fi
fi
}
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