Explore different completion options

[da-luce]

• Traditional _longopt Bash completion is probably simple and safer than current approach
• This probably won't scale the 200k cities though, so we can leverage the binary for city completion:

I need to understand how bash completions work deeper, but here's an idea:

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

    # If the previous word was --city or -c, call the binary dynamically
    if [[ "$prev" == "--city" || "$prev" == "-c" ]]; then
        # Call the C program, pass the partial string, and map results to Bash
        local opts=$(astroterm --complete "$cur")
        COMPREPLY=( $(compgen -W "$opts" -- "$cur") )
        return 0
    fi

    # Fallback to standard flags
    if [[ "$cur" == -* ]]; then
        COMPREPLY=( $(compgen -W "--city --help --version" -- "$cur") )
        return 0
    fi
}

# Register the function
complete -F _astroterm_completions astroterm

No clue if this works though.