You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: zsh_completions.go
    path of file: ./repos/corteza/extra/server-discovery/vendor/github.com/spf13/cobra
    
    the code of the file until where you have to start completion: package cobra

import (
	"bytes"
	"fmt"
	"io"
	"os"
)

// GenZshCompletionFile generates zsh completion file including descriptions.
func (c *Command) GenZshCompletionFile(filename string) error {
	return c.genZshCompletionFile(filename, true)
}

// GenZshCompletion generates zsh completion file including descriptions
// and writes it to the passed writer.
func (c *Command) GenZshCompletion(w io.Writer) error {
	return c.genZshCompletion(w, true)
}

// GenZshCompletionFileNoDesc generates zsh completion file without descriptions.
func (c *Command) GenZshCompletionFileNoDesc(filename string) error {
	return c.genZshCompletionFile(filename, false)
}

// GenZshCompletionNoDesc generates zsh completion file without descriptions
// and writes it to the passed writer.
func (c *Command) GenZshCompletionNoDesc(w io.Writer) error {
	return c.genZshCompletion(w, false)
}

// MarkZshCompPositionalArgumentFile only worked for zsh and its behavior was
// not consistent with Bash completion. It has therefore been disabled.
// Instead, when no other completion is specified, file completion is done by
// default for every argument. One can disable file completion on a per-argument
// basis by using ValidArgsFunction and S
    
func genZshComp(buf io.StringWriter, name string, includeDesc bool) {
	compCmd := ShellCompRequestCmd
	if !includeDesc {
		compCmd = ShellCompNoDescRequestCmd
	}
	WriteStringAndCheck(buf, fmt.Sprintf(`#compdef _%[1]s %[1]s

# zsh completion for %-36[1]s -*- shell-script -*-

__%[1]s_debug()
{
    local file="$BASH_COMP_DEBUG_FILE"
    if [[ -n ${file} ]]; then
        echo "$*" >> "${file}"
    fi
}

_%[1]s()
{
    local shellCompDirectiveError=%[3]d
    local shellCompDirectiveNoSpace=%[4]d
    local shellCompDirectiveNoFileComp=%[5]d
    local shellCompDirectiveFilterFileExt=%[6]d
    local shellCompDirectiveFilterDirs=%[7]d

    local lastParam lastChar flagPrefix requestComp out directive comp lastComp noSpace
    local -a completions

    __%[1]s_debug "\n========= starting completion logic =========="
    __%[1]s_debug "CURRENT: ${CURRENT}, words[*]: ${words[*]}"

    # The user could have moved the cursor backwards on the command-line.
    # We need to trigger completion from the $CURRENT location, so we need
    # to truncate the command-line ($words) up to the $CURRENT location.
    # (We cannot use $CURSOR as its value does not work when a command is an alias.)
    words=("${=words[1,CURRENT]}")
    __%[1]s_debug "Truncated words[*]: ${words[*]},"

    lastParam=${words[-1]}
    lastChar=${lastParam[-1]}
    __%[1]s_debug "lastParam: ${lastParam}, lastChar: ${lastChar}"

    # For zsh, when completing a flag with an = (e.g., %[1]s -n=<TAB>)
    # completions must be prefixed with the flag
    setopt local_options BASH_REMATCH
    if [[ "${lastParam}" =~ '-.*=' ]]; then
        # We are dealing with a flag with an =
        flagPrefix="-P ${BASH_REMATCH}"
    fi

    # Prepare the command to obtain completions
    requestComp="${words[1]} %[2]s ${words[2,-1]}"
    if [ "${lastChar}" = "" ]; then
        # If the last parameter is complete (there is a space following it)
        # We add an extra empty parameter so we can indicate this to the go completion code.
        __%[1]s_debug "Adding extra empty parameter"
        requestComp="${requestComp} \"\""
    fi

    __%[1]s_debug "About to call: eval ${requestComp}"

    # Use eval to handle any environment variables and such
    out=$(eval ${requestComp} 2>/dev/null)
    __%[1]s_debug "completion output: ${out}"

    # Extract the directive integer following a : from the last line
    local lastLine
    while IFS='\n' read -r line; do
        lastLine=${line}
    done < <(printf "%%s\n" "${out[@]}")
    __%[1]s_debug "last line: ${lastLine}"

    if [ "${lastLine[1]}" = : ]; then
        directive=${lastLine[2,-1]}
        # Remove the directive including the : and the newline
        local suffix
        (( suffix=${#lastLine}+2))
        out=${out[1,-$suffix]}
    else
        # There is no directive specified.  Leave $out as is.
        __%[1]s_debug "No directive found.  Setting do default"
        directive=0
    fi

    __%[1]s_debug "directive: ${directive}"
    __%[1]s_debug "completions: ${out}"
    __%[1]s_debug "flagPrefix: ${flagPrefix}"

    if [ $((directive & shellCompDirectiveError)) -ne 0 ]; then
        __%[1]s_debug "Completion received error. Ignoring completions."
        return
    fi

    while IFS='\n' read -r comp; do
        if [ -n "$comp" ]; then
            # If requested, completions are returned with a description.
            # The description is preceded by a TAB character.
            # For zsh's _describe, we need to use a : instead of a TAB.
            # We first need to escape any : as part of the completion itself.
            comp=${comp//:/\\:}

            local tab=$(printf '\t')
            comp=${comp//$tab/:}

            __%[1]s_debug "Adding completion: ${comp}"
            completions+=${comp}
            lastComp=$comp
        fi
    done < <(printf "%%s\n" "${out[@]}")

    if [ $((directive & shellCompDirectiveNoSpace)) -ne 0 ]; then
        __%[1]s_debug "Activating nospace."
        noSpace="-S ''"
    fi

    if [ $((directive & shellCompDirectiveFilterFileExt)) -ne 0 ]; then
        # File extension filtering
        local filteringCmd
        filteringCmd='_files'
        for filter in ${completions[@]}; do
            if [ ${filter[1]} != '*' ]; then
                # zsh requires a glob pattern to do file filtering
                filter="\*.$filter"
            fi
            filteringCmd+=" -g $filter"
        done
        filteringCmd+=" ${flagPrefix}"

        __%[1]s_debug "File filtering command: $filteringCmd"
        _arguments '*:filename:'"$filteringCmd"
    elif [ $((directive & shellCompDirectiveFilterDirs)) -ne 0 ]; then
        # File completion for directories only
        local subdir
        subdir="${completions[1]}"
        if [ -n "$subdir" ]; then
            __%[1]s_debug "Listing directories in $subdir"
            pushd "${subdir}" >/dev/null 2>&1
        else
            __%[1]s_debug "Listing directories in ."
        fi

        local result
        _arguments '*:dirname:_files -/'" ${flagPrefix}"
        result=$?
        if [ -n "$subdir" ]; then
            popd >/dev/null 2>&1
        fi
        return $result
    else
        __%[1]s_debug "Calling _describe"
        if eval _describe "completions" completions $flagPrefix $noSpace; then
            __%[1]s_debug "_describe found some completions"

            # Return the success of having called _describe
            return 0
        else
            __%[1]s_debug "_describe did not find completions."
            __%[1]s_debug "Checking if we should do file completion."
            if [ $((directive & shellCompDirectiveNoFileComp)) -ne 0 ]; then
                __%[1]s_debug "deactivating file completion"

                # We must return an error code here to let zsh know that there were no
                # completions found by _describe; this is what will trigger other
                # matching algorithms to attempt to find completions.
                # For example zsh can match letters in the middle of words.
                return 1
            else
                # Perform file completion
                __%[1]s_debug "Activating file completion"

                # We must return the result of this command, so it must be the
                # last command, or else we must store its result to return it.
                _arguments '*:filename:_files'" ${flagPrefix}"
            fi
        fi
    fi
}

# don't run the completion function when being source-ed or eval-ed
if [ "$funcstack[1]" = "_%[1]s" ]; then
    _%[1]s
fi
`, name, compCmd,
		ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp,
		ShellCompDirectiveFilterFileExt, ShellCompDirectiveFilterDirs))
}