#! __SH__
# Copyright 2011 Google Inc.
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#
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# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
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#   may be used to endorse or promote products derived from this software
#   without specific prior written permission.
#
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# \file atf2kyua.sh
# Converts Atffiles to Kyuafiles for a particular test suite.


"${KYUA_ATF_COMPAT_PKGDATADIR:-__PKGDATADIR__}/lib.subr"


# Prunes all Kyuafiles from a test suite in preparation for regeneration.
#
# \param target_root The path to the test suite.
remove_kyuafiles() {
   local target_root="${1}"; shift

   if [ -d "${target_root}" ]; then
       lib_info "Removing stale Kyuafiles from ${target_root}"
       find "${target_root}" -name Kyuafile -exec rm -f {} \;
   fi
}


# Obtains the list of test programs and subdirectories referenced by an Atffile.
#
# Any globs within the Atffile are expanded relative to the directory in which
# the Atffile lives.
#
# \param atffile The path to the Atffile to process.
#
# \post Prints the list of files referenced by the Atffile on stdout.
extract_files() {
   local atffile="${1}"; shift

   local dir="$(dirname "${atffile}")"

   local globs="$(grep '^tp-glob:' "${atffile}" | cut -d ' ' -f 2-)"
   local files="$(grep '^tp:' "${atffile}" | cut -d ' ' -f 2-)"

   for file in ${files} $(cd "$(dirname "${atffile}")" && echo ${globs}); do
       if test -d "${dir}/${file}" -o -x "${dir}/${file}"; then
           echo "${file}"
       fi
   done
}


# Converts an Atffile to a Kyuafile.
#
# \param atffile The path to the Atfffile to convert.
# \param kyuafile The path to where the Kyuafile will be written.
convert_atffile() {
   local atffile="${1}"; shift
   local kyuafile="${1}"; shift

   lib_info "Converting ${atffile} -> ${kyuafile}"

   local test_suite="$(grep 'prop:.*test-suite.*' "${atffile}" \
       | cut -d \" -f 2)"

   local dir="$(dirname "${atffile}")"

   local subdirs=
   local test_programs=
   for file in $(extract_files "${atffile}"); do
       if test -f "${dir}/${file}/Atffile"; then
           subdirs="${subdirs} ${file}"
       elif test -x "${dir}/${file}"; then
           test_programs="${test_programs} ${file}"
       fi
   done

   mkdir -p "$(dirname "${kyuafile}")"

   echo "syntax('kyuafile', 1)" >"${kyuafile}"
   echo >>"${kyuafile}"
   echo "test_suite('${test_suite}')" >>"${kyuafile}"
   if [ -n "${subdirs}" ]; then
       echo >>"${kyuafile}"
       for dir in ${subdirs}; do
           echo "include('${dir}/Kyuafile')" >>"${kyuafile}"
       done
   fi
   if [ -n "${test_programs}" ]; then
       echo >>"${kyuafile}"
       for tp in ${test_programs}; do
           echo "atf_test_program{name='${tp}'}" >>"${kyuafile}"
       done
   fi
}


# Adds Kyuafiles to a test suite by converting any existing Atffiles.
#
# \param source_root The path to the existing test suite root.  Must contain
#     an Atffile and the test programs.
# \param target_root The path to the directory where the Kyuafiles will be
#     written.  The layout will mimic that of source_root.
add_kyuafiles() {
   local source_root="${1}"; shift
   local target_root="${1}"; shift

   for atffile in $(cd "${source_root}" && find . -name Atffile); do
       local subdir="$(echo "${atffile}" | sed 's,Atffile$,,;s,^\./,,')"
       convert_atffile "${source_root}/${subdir}Atffile" \
           "${target_root}/${subdir}Kyuafile"
   done
}


# Prints program usage to stdout.
#
# \param progname The name of the program to use for the syntax help.
usage() {
   local progname="${1}"; shift
   echo "Usage: ${progname} [-s source_root] [-t target_root]"
}


# Entry point for the program.
#
# \param ... The user-provided arguments.
main() {
   local source_root=
   local target_root=

   while getopts ':s:t:' arg "${@}"; do
       case "${arg}" in
       s)
           source_root="${OPTARG}"
           ;;
       t)
           target_root="${OPTARG}"
           ;;
       \?)
           lib_usage_error "Unknown option -${OPTARG}"
           ;;
       esac
   done
   shift $((${OPTIND} - 1))

   [ -n "${source_root}" ] || source_root=.
   [ -n "${target_root}" ] || target_root="${source_root}"

   [ ${#} -eq 0 ] || lib_usage_error "No arguments allowed"

   [ -f "${source_root}/Atffile" ] || \
       lib_error "${source_root} is not a test suite; missing Atffile"

   remove_kyuafiles "${target_root}"
   add_kyuafiles "${source_root}" "${target_root}"
}


main "${@}"

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