bash-completion

# list of commands/arguments
__nnictl_cmds="create resume update stop trial experiment config rest log"
__nnictl_create_cmds="--config --webuiport"
__nnictl_resume_cmds="--experiment --manager --webuiport"
__nnictl_update_cmds="searchspace concurrency duration"
__nnictl_update_searchspace_cmds="--filename"
__nnictl_update_concurrency_cmds="--value"
__nnictl_update_duration_cmds="--value"
__nnictl_trial_cmds="ls kill"
__nnictl_trial_kill_cmds="--trialid"
__nnictl_webui_cmds="start stop url"
__nnictl_webui_start_cmds="--port"
__nnictl_experiment_cmds="show"
__nnictl_config_cmds="show"
__nnictl_rest_cmds="check"
__nnictl_log_cmds="stdout stderr"
__nnictl_log_stdout_cmds="--tail --head --path"
__nnictl_log_stderr_cmds="--tail --head --path"

# list of arguments that accept a file name
__nnictl_file_args=" --config -c --filename -f "

# list of arguments that accept an experiment ID
__nnictl_experiment_args=" --experiment -e "

# list of arguments that accept a trial ID
__nnictl_trial_args=" --trialid -t "


# remove already set arguments from candidates
__nnictl_remain_args()
{
    local ret=${!1}  # ret = $__nnictl_xxx_cmds
    # for arg in COMP_WORDS[:-1]:
    for arg in "${COMP_WORDS[@]::${#COMP_WORDS[@]}-1}"; do
        if [[ $arg == --* ]]; then
            local ret=${ret/$arg/}  # remove it from $ret
        fi
    done
    echo $ret
}

_nnictl()
{
    if [[ ${#COMP_WORDS[@]} -eq 2 ]]; then
        # completing frst argument from __nnictl_cmds
        COMPREPLY=($(compgen -W "$__nnictl_cmds" -- "${COMP_WORDS[1]}"))

    elif [[ ${#COMP_WORDS[@]} -eq 3 ]]; then
        # completing second argument from __nnictl_${FirstArg}_cmds
        local args=__nnictl_${COMP_WORDS[1]}_cmds
        COMPREPLY=($(compgen -W "${!args}" -- "${COMP_WORDS[2]}"))

    elif [[ ${COMP_WORDS[-2]} != -* ]]; then
        # last argument does not starts with "-", so this one is likely to be "--xxx"
        if [[ ${COMP_WORDS[2]} == -* ]]; then
            # second argument starts with "-", use __nnictl_${FirstArg}_cmds
            local args=__nnictl_${COMP_WORDS[1]}_cmds
        else
            # second argument is a word, use __nnictl_${FirstArg}_{SecondArg}_cmds
            local args=__nnictl_${COMP_WORDS[1]}_${COMP_WORDS[2]}_cmds
        fi
        # remove already set arguments from candidates
        local remain_args=$(__nnictl_remain_args ${args})
        COMPREPLY=($(compgen -W "$remain_args" -- "${COMP_WORDS[-1]}"))

    elif [[ $__nnictl_file_args =~ " ${COMP_WORDS[-2]} " ]]; then
        # complete file names
        COMPREPLY=($(compgen -f "${COMP_WORDS[-1]}"))

    elif [[ $__nnictl_experiment_args =~ " ${COMP_WORDS[-2]} " ]]; then
        # complete experiment IDs
        local experiments=$(ls ~/nni/experiments 2>/dev/null)
        COMPREPLY=($(compgen -W "$experiments" -- "${COMP_WORDS[-1]}"))

    elif [[ $__nnictl_trial_args =~ " ${COMP_WORDS[-2]} " ]]; then
        # complete trial IDs
        local trials=$(ls -d ~/nni/experiments/*/trials/* 2>/dev/null | grep -o '[^/]*$')
        COMPREPLY=($(compgen -W "$trials" -- "${COMP_WORDS[-1]}"))
    fi
}

complete -o nospace -F _nnictl nnictl