#!/bin/sh
# vim: ft=sh ts=4 sw=4 et
#
# Given the name of a Mercury source file, print the name of the module
# recorded in Mercury.modules as the name of the Mercury module
# in that file.
#

if test "$#" = 1
then
    m_file="$1"
else
    echo "usage: m_file_module file_name.m"
    exit 1
fi

case "${m_file}" in
    *.m)
        ;;
    *)
        echo "m_file_module: ${m_file} does not end in .m"
        exit 1
        ;;
esac

if test ! -f "Mercury.modules"
then
    echo "m_file_module: Mercury.modules does not exist"
    exit 1
fi

awk_prog="
\$2 == \"${m_file}\"    {
        printf \"%s\\n\", \$1;
        found = 1;
    }
END                     {
        if (found) {
            exit 0;
        } else {
            printf \"m_file_module: %s is not in Mercury.modules\\n\",
                \"${m_file}\";
            exit 1;
        }
    }
"
awk -e "${awk_prog}" < Mercury.modules