#compdef inv invoke

typeset -A opt_args
local context state line

function _invoke_subcommands {
    LISTINGS=( $(invoke -l | tail -n+2 | sed 's/^ *//g' | while read line ; do _remove_docstrings "$line"; done;) )
    for subcommand_listing in $LISTINGS
    do
	local comma_separated="$(echo $subcommand_listing | tr -d ')\n' | tr '(' ',')"
	local names="$(_echo_split $comma_separated ',')"
	echo $names | tr '\n' ' '
    done
}

function _remove_docstrings {
    local delimiter_character=' '
    if echo $1 | grep ')' > /dev/null
    then
	delimiter_character=')'
    fi
    echo $1 | cut -d "$delimiter_character" -f 1
}

function _echo_split {
   local IFS    
    IFS="$2" read -rA -- arr <<EOF
$1
EOF
    echo "${arr[@]}"
}

function _complete_invoke_subcommand {
    local cache_policy cache_name _invoke_subcommands
    cache_name=invoke/subcommands"$(pwd)"
    zstyle -s ":completion:${curcontext}:" cache-policy cache_policy

    if [[ -z "$cache_policy" ]]; then
        zstyle ":completion:${curcontext}:" cache-policy _invoke_subcommands_caching_policy
    fi

    if _cache_invalid "$cache_name" || ! _retrieve_cache "$cache_name"; then
        _invoke_subcommands=( $(_invoke_subcommands) )
        _store_cache "$cache_name" _invoke_subcommands
    fi

    local expl
    _wanted invoke_subcommands expl 'invoke subcommands' compadd -a _invoke_subcommands
}

function _invoke_subcommands_caching_policy {
    local -a oldp
    oldp=( "$1"(Nmm+1) ) # 1 minute
    (( $#oldp ))
}

_arguments -s -S \
  "--no-dedupe[Disable task deduplication.]" \
  "(-c --collection)"{-c,--collection}"[Specify collection name to load. May be given >1 time.]" \
  "(-e --echo)"{-e,--echo}"[Echo executed commands before running.]" \
  "(-h --help)"{-h,--help}"[Show core or per-task help and exit.]:command:_invoke_subcommand" \
  "(-H --hide)"{-H,--hide}"[Set default value of run()'s 'hide' kwarg.]:command:_invoke_subcommand" \
  "(-l --list)"{-l,--list}"[List available tasks.]" \
  "(-p --pty)"{-p,--pty}"[Use a pty when executing shell commands.]" \
  "(-r --root)"{-r,--root}"[Change root directory used for finding task modules.]:directory:_directories" \
  "(-V --version)"{-V,--version}"[Show version and exit.]:" \
  "(-w --warn-only)"{-w,--warn-only}"[Warn, instead of failing, when shell commands fail.]" \
  "*:invoke command:_complete_invoke_subcommand"