# Michael Schuerig, michael@schuerig.de, 2007-02-24
# Free for all uses.

_gem()
{
    local cur prev completions

    COMPREPLY=()
    cur=${COMP_WORDS[COMP_CWORD]}
    prev=${COMP_WORDS[COMP_CWORD-1]}

    COMMANDS='build cert check cleanup contents dependency\
      environment help install list query rdoc search specification\
      uninstall unpack update'

    COMMON_OPTIONS='\
      --source
      -p --http-proxy --no-http-proxy\
      -h --help\
      --config-file\
      --backtrace\
      --debug'

    CERT_OPTIONS='\
      -a -add\
      -l --list\
      -r --remove\
      -b --build\
      -C --certificate\
      -K --private-key\
      -s --sign'

    CHECK_OPTIONS='\
      -v --verify\
      -a --alien\
      -t --test\
      -V --version'

    CLEANUP_OPTIONS='\
      -d --dry-run'

    CONTENTS_OPTIONS='\
      -l --list\
      -V --version\
      -s --spec-dir\
      -v --verbose'

    DEPENDENCY_OPTIONS='\
      -v --version\
      -r --reverse-dependencies --no-reverse-dependencies\
      -p --pipe'

    HELP_OPTIONS=$COMMANDS

    INSTALL_OPTIONS='\
      -v --version\
      -l --local\
      -r --remote\
      -b --both\
      -i --install-dir\
      -B --build-root\
      -d --rdoc --no-rdoc\
      --ri --no-ri\
      -f --force --no-force\
      -t --test --no-test\
      -w --wrappers --no-wrappers\
      -P --trust-policy\
      --ignore-dependencies\
      -y --include-dependencies'

    LIST_OPTIONS='\
      -d --details --no-details\
      -l --local\
      -r --remote\
      -b --both'

    QUERY_OPTIONS='\
      -n --name-matches\
      -d --details --no-details\
      -l --local\
      -r --remote\
      -b --both'

    RDOC_OPTIONS='\
      --all\
      --rdoc --no-rdoc\
      --ri --no-ri\
      -v --version'

    SEARCH_OPTIONS='\
      -d --details --no-details\
      -l --local\
      -r --remote\
      -b --both'

    SPECIFICATION_OPTIONS='\
      -v --version\
      -l --local\
      -r --remote\
      -b --both\
      -all'

    UNINSTALL_OPTIONS='\
      -a --all --no-all\
      -i --ignore-dependencies --no-ignore-dependencies\
      -x --executables --no-executables\
      -v --version'

    UNPACK_OPTIONS='\
      -v --version'

    UPDATE_OPTIONS='\
      -i --install-dir\
      -B --build-root\
      -d --rdoc --no-rdoc\
      -ri --no-ri\
      -f --force --no-force\
      -t --test --no-test\
      -w --wrappers --no-wrappers\
      -P --trust-policy\
      --ignore-dependencies\
      -y --include-dependencies\
      --system'

    case "${prev}" in
      build)
        completions="$COMMON_OPTIONS $BUILD_OPTIONS"
        ;;
      cert)
        completions="$COMMON_OPTIONS $CERT_OPTIONS"
        ;;
      check)
        completions="$COMMON_OPTIONS $CHECK_OPTIONS"
        ;;
      cleanup)
        completions="$COMMON_OPTIONS $CLEANUP_OPTIONS"
        ;;
      contents)
        completions="$COMMON_OPTIONS $CONTENTS_OPTIONS"
        ;;
      dependency)
        completions="$COMMON_OPTIONS $DEPENDENCY_OPTIONS"
        ;;
      environment)
        completions="$COMMON_OPTIONS $ENVIRONMENT_OPTIONS"
        ;;
      help)
        completions="$COMMON_OPTIONS $HELP_OPTIONS"
        ;;
      install)
        completions="$COMMON_OPTIONS $INSTALL_OPTIONS"
        ;;
      list)
        completions="$COMMON_OPTIONS $LIST_OPTIONS"
        ;;
      query)
        completions="$COMMON_OPTIONS $QUERY_OPTIONS"
        ;;
      rdoc)
        completions="$COMMON_OPTIONS $RDOC_OPTIONS"
        ;;
      search)
        completions="$COMMON_OPTIONS $SEARCH_OPTIONS"
        ;;
      specification)
        completions="$COMMON_OPTIONS $SPECIFICATION_OPTIONS"
        ;;
      uninstall)
        completions="$COMMON_OPTIONS $UNINSTALL_OPTIONS"
        ;;
      unpack)
        completions="$COMMON_OPTIONS $UNPACK_OPTIONS"
        ;;
      update)
        completions="$COMMON_OPTIONS $UPDATE_OPTIONS"
        ;;
      *)
        completions="$COMMANDS $COMMON_OPTIONS"
        ;;
    esac

    COMPREPLY=( $( compgen -W "$completions" -- $cur ))
    return 0
}

[ -n "${have:-}" ] && complete -F _gem $filenames gem