How do I autocomplete nested, multi-level subcommands?

autocomplete, bash, compgen, tab-completion

Solution

Here's an example script for your two-level case (with a section for subcommands of `show` to show how it's done - you can just delete those three lines if they're not relevant to your case):

_foo()
{
    local cur prev

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

    case ${COMP_CWORD} in
        1)
            COMPREPLY=($(compgen -W "configure show" -- ${cur}))
            ;;
        2)
            case ${prev} in
                configure)
                    COMPREPLY=($(compgen -W "CM DSP NPU" -- ${cur}))
                    ;;
                show)
                    COMPREPLY=($(compgen -W "some other args" -- ${cur}))
                    ;;
            esac
            ;;
        *)
            COMPREPLY=()
            ;;
    esac
}

complete -F _foo foo

Hopefully it's fairly obvious from that example how you'd extend it to three-level commands etc., as well.

Problem

I am trying to develop an autocomplete or tab-complete feature for my own set of commands. For example, assume foo is my binary: ``` CLI>> foo [TAB] [TAB] ``` It should show the main commands `configure` and `show`. Then if I select `configure`, it should show the subcommands `CM`, `DSP` and `NPU`: ``` CLI>> foo configure [TAB] [TAB] DSP NPU CM` ``` I only know how to tab-complete and display for the first level - how can I get the second level as well? I will place this in `/etc/completion.d`. My Code: ``` _foo() { local cur prev opts COMPREPLY=() cur="${COMP_WORDS[COMP_CWORD]}" prev="${COMP_WORDS[COMP_CWORD-1]}" words=("${COMP_WORDS[@]}") cword=$COMP_CWORD opts="configure show" } ``` I'm stuck as how to add sub commands `CM` `DSP` `NPU` under `configure`.

Original source

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