# gcc(1) completion                                        -*- shell-script -*-
#
# The only unusual feature is that we don't parse "gcc --help -v" output
# directly, because that would include the options of all the other backend
# tools (linker, assembler, preprocessor, etc) without any indication that
# you cannot feed such options to the gcc driver directly.  (For example, the
# linker takes a -z option, but you must type -Wl,-z for gcc.)  Instead, we
# ask the driver ("g++") for the name of the compiler ("cc1"), and parse the
# --help output of the compiler.

proc _gcc
{
    var cur = '', prev = '', words = '', cword = ''
    _init_completion || return

    _expand || return 0

    var cc = '', backend = ''

    match $1 {
        with gcj
            set backend = 'jc1'
            
        with gpc
            set backend = 'gpc1'
            
        with *77
            set backend = 'f771'
            
        with *95
            set backend = 'f951'
            
        with *
            set backend = 'cc1' # (near-)universal backend
            
    }

    if [[ "$cur" == -* ]] {
        set cc = $[ $1 -print-prog-name=$backend !2 >/dev/null]
        [[ $cc ]] || return
        # sink stderr:
        # for C/C++/ObjectiveC it's useless
        # for FORTRAN/Java it's an error
        setglobal COMPREPLY = '( '$( compgen -W "$( $cc --help 2>/dev/null | tr '\t' ' ' |\
           sed -e '/^  *-/!d' -e 's/ *-\([^][ <>]*\).*/-\1/' )" -- "$cur" ) )
        [[ $COMPREPLY == *= ]] && compopt -o nospace
    } else {
        _filedir
    }
} &&
complete -F _gcc gcc g++ gfortran g77 g95 gcj gpc &&
do {
    cc  --version !2 >/dev/null | command grep -q GCC || \
        [[ $( _realcommand cc ) == *gcc* ]] && \
        complete -F _gcc cc  || complete -F _minimal cc
    c++ --version !2 >/dev/null | command grep -q GCC || \
        [[ $( _realcommand c++ ) == *g++* ]] && \
        complete -F _gcc c++ || complete -F _minimal c++
    f77 --version !2 >/dev/null | command grep -q GCC || \
        [[ $( _realcommand f77 ) == *gfortran* ]] && \
        complete -F _gcc f77 || complete -F _minimal f77
    f95 --version !2 >/dev/null | command grep -q GCC || \
        [[ $( _realcommand f95 ) == *gfortran* ]] && \
        complete -F _gcc f95 || complete -F _minimal f95
}

# ex: ts=4 sw=4 et filetype=sh