bash-completion/completions/man

# man(1) completion

[ $USERLAND = GNU -o $UNAME = Darwin \
  -o $UNAME = FreeBSD -o $UNAME = SunOS -o $UNAME = Cygwin \
  -o $UNAME = OpenBSD ] &&
_man()
{
    local cur i prev sect manpath manext mansect uname

    manext="@([0-9lnp]|[0-9][px]|man|3pm)?(.@([gx]z|bz2|lzma|Z))"
    mansect="@([0-9lnp]|[0-9][px]|3pm)"

    COMPREPLY=()
    _get_comp_words_by_ref cur prev

    if [[ "$prev" == -l ]]; then
        _filedir $manext
        return 0
    fi

    _expand || return 0

    # file based completion if parameter contains /
    if [[ "$cur" == */* ]]; then
        _filedir $manext
        return 0
    fi

    uname=$( uname -s )
    if [[ $uname == @(Linux|GNU|GNU/*|FreeBSD|Cygwin|CYGWIN_*) ]]; then
        manpath=$( manpath 2>/dev/null || command man --path )
    else
        manpath=$MANPATH
    fi

    if [ -z "$manpath" ]; then
        COMPREPLY=( $( compgen -c -- "$cur" ) )
        return 0
    fi

    # determine manual section to search
    [[ "$prev" == $mansect ]] && sect=$prev || sect='*'

    manpath=$manpath:
    if [ -n "$cur" ]; then
        manpath="${manpath//://*man$sect/$cur* } ${manpath//://*cat$sect/$cur* }"
    else
        manpath="${manpath//://*man$sect/ } ${manpath//://*cat$sect/ }"
    fi

    # redirect stderr for when path doesn't exist
    COMPREPLY=( $( eval command ls "$manpath" 2>/dev/null ) )
    # weed out directory path names and paths to man pages
    COMPREPLY=( ${COMPREPLY[@]##*/?(:)} )
    # strip suffix from man pages
    COMPREPLY=( ${COMPREPLY[@]%.@([gx]z|bz2|lzma|Z)} )
    COMPREPLY=( $( compgen -W '${COMPREPLY[@]%.*}' -- "${cur//\\\\/}" ) )

    if [[ "$prev" != $mansect ]]; then
        # File based completion for the rest, prepending ./ if needed
        # (man 1.6f needs that for man pages in current dir)
        local start=${#COMPREPLY[@]}
        _filedir $manext
        for (( i=$start; i < ${#COMPREPLY[@]}; i++ )); do
            [[ ${COMPREPLY[i]} == */* ]] || COMPREPLY[i]=./${COMPREPLY[i]}
        done
    fi

    return 0
}
[ $USERLAND = GNU -o $UNAME = Darwin \
  -o $UNAME = FreeBSD -o $UNAME = SunOS -o $UNAME = Cygwin \
  -o $UNAME = OpenBSD ] && \
complete -F _man -o filenames man apropos whatis

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