bash_completion.bash

# This script registers the bash auto completion for GM2Calc's main
# program gm2calc.x.
#
# Usage:
#
#   . bash_completions.bash

_gm2calc()
{
    local cur prev opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"
    opts="
--gm2calc-input-file=
--slha-input-file=
--thdm-input-file=
--help
--version
"

    # handle --xxxxxx=
    if [[ ${prev} == "--"* && ${cur} == "=" ]] ; then
        compopt -o filenames
        COMPREPLY=(*)
        return 0
    fi

    # handle --xxxxx=path
    if [[ ${prev} == '=' ]] ; then
        # unescape space
        cur=${cur//\\ / }
        # expand tilde to $HOME
        [[ ${cur} == "~/"* ]] && cur=${cur/\~/$HOME}
        # show completion if path exist (and escape spaces)
        compopt -o filenames
        local files=("${cur}"*)
        [[ -e ${files[0]} ]] && COMPREPLY=( "${files[@]// /\ }" )
        return 0
    fi

    # handle other options
    COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
    if [[ ${#COMPREPLY[@]} == 1 && ${COMPREPLY[0]} != "--"*"=" ]] ; then
        # if there's only one option, without =, then allow a space
        compopt +o nospace
    fi

    return 0
}

complete -o nospace -F _gm2calc gm2calc.x