configure

#! /bin/sh

# Copyright (c) 2023 Robbert Haarman
#
# SPDX-License-Identifier: MIT
#
# Creates config and Makefile.
#
# The script requires the following command line arguments:
#
#   --shell-to-test <path>
#
# This specifies the path of the shell to be tested.
#
# If the configure script is run inside a directory other than
# the directory where it is located, the config file and Makefile
# are created in that directory.
#
# If the configure script is run inside the directory where it
# is located, a directory "out" is created if it does not already
# exist, and the configure script is re-run in there. Then, a
# Makefile is created in the currect directory which
# effectively cd's into the out directory and invokes the
# Makefile there.

set -e

goodsh=/bin/sh

# Parse command line arguments.
testsh=""
while [ $# -gt 0 ]
do
    if [ "$1" = "--shell-to-test" ]
    then
        if [ $# -lt 2 ]
        then
            printf "missing value for --shell-to-test\n" >&2
            exit 2
        fi
        shift
        testsh="$1"
    else
        printf "unknown parameter: %s\n" "$1" >&2
        exit 2
    fi
    shift
done

if [ -z "$testsh" ]
then
    printf "missing required argument --shell-to-test\n" >&2
    exit 2
fi

srcdir="$(dirname "$0")"
if [ "$srcdir" = "." -o "$srcdir" = "" ]
then
    # configure is being run in the sourc directory.
    # Create the out directory, re-run configure from there,
    # and create a Makefile in the source directory so that
    # running make from there works.

    # If testsh is not absolute, make it absolute.
    case "$testsh" in
        /*) true ;;
        *) testsh="$PWD/$testsh" ;;
    esac
    mkdir -p out
    cd out
    ../configure --shell-to-test "$testsh"
    cd ..
    cat >Makefile <<'EOT'
all :
	$(MAKE) -C out all

check :
	$(MAKE) -C out check

clean :
	$(MAKE) -C out clean

distclean :
	$(MAKE) -C out distclean
	rm -fr out

.PHONY : all check clean distclean
EOT
    exit
fi

# Enumerate tests.
tests=""
for x in "$srcdir/src/"*.test
do
    name="$(basename "$x" .test)"
    tests="$tests $name"
    test_targets="$(printf "%s %s\n\t%s" "$tests" \\ "$name")"
done

bindir="$srcdir/bin"
cat >config <<EOT
TESTSH="$testsh"
BINDIR="$bindir"
EOT

cat >Makefile <<EOT
all :

check : ${test_targets}
	@$goodsh "${bindir}/check_results"

clean :

distclean : clean

.PHONY : all check clean distclean
EOT

for test in $tests
do
    cat >>Makefile <<EOT

.PHONY : ${test}
${test} :
	@printf "%s\n" "$test"
	@printf 'UNFINISHED\n' > "$test.result"
	@$goodsh ${srcdir}/src/${test}.test
EOT
done