package cobra import ( "bytes" "fmt" "io" "os" ) func (c *Command) genBashCompletion(w io.Writer, includeDesc bool) error { buf := new(bytes.Buffer) genBashComp(buf, c.Name(), includeDesc) _, err := buf.WriteTo(w) return err } func genBashComp(buf io.StringWriter, name string, includeDesc bool) { compCmd := ShellCompRequestCmd if !includeDesc { compCmd = ShellCompNoDescRequestCmd } WriteStringAndCheck(buf, fmt.Sprintf(`# bash completion V2 for %-36[1]s -*- shell-script -*- __%[1]s_debug() { if [[ -n ${BASH_COMP_DEBUG_FILE:-} ]]; then echo "$*" >> "${BASH_COMP_DEBUG_FILE}" fi } # Macs have bash3 for which the bash-completion package doesn't include # _init_completion. This is a minimal version of that function. __%[1]s_init_completion() { COMPREPLY=() _get_comp_words_by_ref "$@" cur prev words cword } # This function calls the %[1]s program to obtain the completion # results and the directive. It fills the 'out' and 'directive' vars. __%[1]s_get_completion_results() { local requestComp lastParam lastChar args # Prepare the command to request completions for the program. # Calling ${words[0]} instead of directly %[1]s allows to handle aliases args=("${words[@]:1}") requestComp="${words[0]} %[2]s ${args[*]}" lastParam=${words[$((${#words[@]}-1))]} lastChar=${lastParam:$((${#lastParam}-1)):1} __%[1]s_debug "lastParam ${lastParam}, lastChar ${lastChar}" if [ -z "${cur}" ] && [ "${lastChar}" != "=" ]; then # If the last parameter is complete (there is a space following it) # We add an extra empty parameter so we can indicate this to the go method. __%[1]s_debug "Adding extra empty parameter" requestComp="${requestComp} ''" fi # When completing a flag with an = (e.g., %[1]s -n=) # bash focuses on the part after the =, so we need to remove # the flag part from $cur if [[ "${cur}" == -*=* ]]; then cur="${cur#*=}" fi __%[1]s_debug "Calling ${requestComp}" # Use eval to handle any environment variables and such out=$(eval "${requestComp}" 2>/dev/null) # Extract the directive integer at the very end of the output following a colon (:) directive=${out##*:} # Remove the directive out=${out%%:*} if [ "${directive}" = "${out}" ]; then # There is not directive specified directive=0 fi __%[1]s_debug "The completion directive is: ${directive}" __%[1]s_debug "The completions are: ${out}" } __%[1]s_process_completion_results() { local shellCompDirectiveError=%[3]d local shellCompDirectiveNoSpace=%[4]d local shellCompDirectiveNoFileComp=%[5]d local shellCompDirectiveFilterFileExt=%[6]d local shellCompDirectiveFilterDirs=%[7]d if [ $((directive & shellCompDirectiveError)) -ne 0 ]; then # Error code. No completion. __%[1]s_debug "Received error from custom completion go code" return else if [ $((directive & shellCompDirectiveNoSpace)) -ne 0 ]; then if [[ $(type -t compopt) = "builtin" ]]; then __%[1]s_debug "Activating no space" compopt -o nospace else __%[1]s_debug "No space directive not supported in this version of bash" fi fi if [ $((directive & shellCompDirectiveNoFileComp)) -ne 0 ]; then if [[ $(type -t compopt) = "builtin" ]]; then __%[1]s_debug "Activating no file completion" compopt +o default else __%[1]s_debug "No file completion directive not supported in this version of bash" fi fi fi if [ $((directive & shellCompDirectiveFilterFileExt)) -ne 0 ]; then # File extension filtering local fullFilter filter filteringCmd # Do not use quotes around the $out variable or else newline # characters will be kept. for filter in ${out}; do fullFilter+="$filter|" done filteringCmd="_filedir $fullFilter" __%[1]s_debug "File filtering command: $filteringCmd" $filteringCmd elif [ $((directive & shellCompDirectiveFilterDirs)) -ne 0 ]; then # File completion for directories only # Use printf to strip any trailing newline local subdir subdir=$(printf "%%s" "${out}") if [ -n "$subdir" ]; then __%[1]s_debug "Listing directories in $subdir" pushd "$subdir" >/dev/null 2>&1 && _filedir -d && popd >/dev/null 2>&1 || return else __%[1]s_debug "Listing directories in ." _filedir -d fi else __%[1]s_handle_completion_types fi __%[1]s_handle_special_char "$cur" : __%[1]s_handle_special_char "$cur" = } __%[1]s_handle_completion_types() { __%[1]s_debug "__%[1]s_handle_completion_types: COMP_TYPE is $COMP_TYPE" case $COMP_TYPE in 37|42) # Type: menu-complete/menu-complete-backward and insert-completions # If the user requested inserting one completion at a time, or all # completions at once on the command-line we must remove the descriptions. # https://github.com/spf13/cobra/issues/1508 local tab=$'\t' comp while IFS='' read -r comp; do [[ -z $comp ]] && continue # Strip any description comp=${comp%%%%$tab*} # Only consider the completions that match if [[ $comp == "$cur"* ]]; then COMPREPLY+=("$comp") fi done < <(printf "%%s\n" "${out}") ;; *) # Type: complete (normal completion) __%[1]s_handle_standard_completion_case ;; esac } __%[1]s_handle_standard_completion_case() { local tab=$'\t' comp # Short circuit to optimize if we don't have descriptions if [[ $out != *$tab* ]]; then IFS=$'\n' read -ra COMPREPLY -d '' < <(IFS=$'\n' compgen -W "$out" -- "$cur") return 0 fi local longest=0 local compline # Look for the longest completion so that we can format things nicely while IFS='' read -r compline; do [[ -z $compline ]] && continue # Strip any description before checking the length comp=${compline%%%%$tab*} # Only consider the completions that match [[ $comp == "$cur"* ]] || continue COMPREPLY+=("$compline") if ((${#comp}>longest)); then longest=${#comp} fi done < <(printf "%%s\n" "${out}") # If there is a single completion left, remove the description text if [ ${#COMPREPLY[*]} -eq 1 ]; then __%[1]s_debug "COMPREPLY[0]: ${COMPREPLY[0]}" comp="${COMPREPLY[0]%%%%$tab*}" __%[1]s_debug "Removed description from single completion, which is now: ${comp}" COMPREPLY[0]=$comp else # Format the descriptions __%[1]s_format_comp_descriptions $longest fi } __%[1]s_handle_special_char() { local comp="$1" local char=$2 if [[ "$comp" == *${char}* && "$COMP_WORDBREAKS" == *${char}* ]]; then local word=${comp%%"${comp##*${char}}"} local idx=${#COMPREPLY[*]} while [[ $((--idx)) -ge 0 ]]; do COMPREPLY[$idx]=${COMPREPLY[$idx]#"$word"} done fi } __%[1]s_format_comp_descriptions() { local tab=$'\t' local comp desc maxdesclength local longest=$1 local i ci for ci in ${!COMPREPLY[*]}; do comp=${COMPREPLY[ci]} # Properly format the description string which follows a tab character if there is one if [[ "$comp" == *$tab* ]]; then __%[1]s_debug "Original comp: $comp" desc=${comp#*$tab} comp=${comp%%%%$tab*} # $COLUMNS stores the current shell width. # Remove an extra 4 because we add 2 spaces and 2 parentheses. maxdesclength=$(( COLUMNS - longest - 4 )) # Make sure we can fit a description of at least 8 characters # if we are to align the descriptions. if [[ $maxdesclength -gt 8 ]]; then # Add the proper number of spaces to align the descriptions for ((i = ${#comp} ; i < longest ; i++)); do comp+=" " done else # Don't pad the descriptions so we can fit more text after the completion maxdesclength=$(( COLUMNS - ${#comp} - 4 )) fi # If there is enough space for any description text, # truncate the descriptions that are too long for the shell width if [ $maxdesclength -gt 0 ]; then if [ ${#desc} -gt $maxdesclength ]; then desc=${desc:0:$(( maxdesclength - 1 ))} desc+="…" fi comp+=" ($desc)" fi COMPREPLY[ci]=$comp __%[1]s_debug "Final comp: $comp" fi done } __start_%[1]s() { local cur prev words cword split COMPREPLY=() # Call _init_completion from the bash-completion package # to prepare the arguments properly if declare -F _init_completion >/dev/null 2>&1; then _init_completion -n "=:" || return else __%[1]s_init_completion -n "=:" || return fi __%[1]s_debug __%[1]s_debug "========= starting completion logic ==========" __%[1]s_debug "cur is ${cur}, words[*] is ${words[*]}, #words[@] is ${#words[@]}, cword is $cword" # The user could have moved the cursor backwards on the command-line. # We need to trigger completion from the $cword location, so we need # to truncate the command-line ($words) up to the $cword location. words=("${words[@]:0:$cword+1}") __%[1]s_debug "Truncated words[*]: ${words[*]}," local out directive __%[1]s_get_completion_results __%[1]s_process_completion_results } if [[ $(type -t compopt) = "builtin" ]]; then complete -o default -F __start_%[1]s %[1]s else complete -o default -o nospace -F __start_%[1]s %[1]s fi # ex: ts=4 sw=4 et filetype=sh `, name, compCmd, ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp, ShellCompDirectiveFilterFileExt, ShellCompDirectiveFilterDirs)) } // GenBashCompletionFileV2 generates Bash completion version 2. func (c *Command) GenBashCompletionFileV2(filename string, includeDesc bool) error { outFile, err := os.Create(filename) if err != nil { return err } defer outFile.Close() return c.GenBashCompletionV2(outFile, includeDesc) } // GenBashCompletionV2 generates Bash completion file version 2 // and writes it to the passed writer. func (c *Command) GenBashCompletionV2(w io.Writer, includeDesc bool) error { return c.genBashCompletion(w, includeDesc) }