338 lines
12 KiB
Bash
338 lines
12 KiB
Bash
# bash completion V2 for headscale -*- shell-script -*-
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__headscale_debug()
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{
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if [[ -n ${BASH_COMP_DEBUG_FILE-} ]]; then
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echo "$*" >> "${BASH_COMP_DEBUG_FILE}"
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fi
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}
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# Macs have bash3 for which the bash-completion package doesn't include
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# _init_completion. This is a minimal version of that function.
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__headscale_init_completion()
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{
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COMPREPLY=()
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_get_comp_words_by_ref "$@" cur prev words cword
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}
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# This function calls the headscale program to obtain the completion
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# results and the directive. It fills the 'out' and 'directive' vars.
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__headscale_get_completion_results() {
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local requestComp lastParam lastChar args
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# Prepare the command to request completions for the program.
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# Calling ${words[0]} instead of directly headscale allows handling aliases
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args=("${words[@]:1}")
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requestComp="${words[0]} __complete ${args[*]}"
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lastParam=${words[$((${#words[@]}-1))]}
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lastChar=${lastParam:$((${#lastParam}-1)):1}
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__headscale_debug "lastParam ${lastParam}, lastChar ${lastChar}"
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if [[ -z ${cur} && ${lastChar} != = ]]; then
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# If the last parameter is complete (there is a space following it)
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# We add an extra empty parameter so we can indicate this to the go method.
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__headscale_debug "Adding extra empty parameter"
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requestComp="${requestComp} ''"
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fi
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# When completing a flag with an = (e.g., headscale -n=<TAB>)
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# bash focuses on the part after the =, so we need to remove
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# the flag part from $cur
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if [[ ${cur} == -*=* ]]; then
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cur="${cur#*=}"
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fi
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__headscale_debug "Calling ${requestComp}"
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# Use eval to handle any environment variables and such
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out=$(eval "${requestComp}" 2>/dev/null)
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# Extract the directive integer at the very end of the output following a colon (:)
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directive=${out##*:}
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# Remove the directive
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out=${out%:*}
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if [[ ${directive} == "${out}" ]]; then
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# There is not directive specified
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directive=0
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fi
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__headscale_debug "The completion directive is: ${directive}"
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__headscale_debug "The completions are: ${out}"
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}
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__headscale_process_completion_results() {
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local shellCompDirectiveError=1
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local shellCompDirectiveNoSpace=2
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local shellCompDirectiveNoFileComp=4
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local shellCompDirectiveFilterFileExt=8
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local shellCompDirectiveFilterDirs=16
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local shellCompDirectiveKeepOrder=32
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if (((directive & shellCompDirectiveError) != 0)); then
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# Error code. No completion.
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__headscale_debug "Received error from custom completion go code"
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return
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else
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if (((directive & shellCompDirectiveNoSpace) != 0)); then
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if [[ $(type -t compopt) == builtin ]]; then
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__headscale_debug "Activating no space"
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compopt -o nospace
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else
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__headscale_debug "No space directive not supported in this version of bash"
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fi
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fi
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if (((directive & shellCompDirectiveKeepOrder) != 0)); then
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if [[ $(type -t compopt) == builtin ]]; then
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# no sort isn't supported for bash less than < 4.4
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if [[ ${BASH_VERSINFO[0]} -lt 4 || ( ${BASH_VERSINFO[0]} -eq 4 && ${BASH_VERSINFO[1]} -lt 4 ) ]]; then
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__headscale_debug "No sort directive not supported in this version of bash"
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else
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__headscale_debug "Activating keep order"
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compopt -o nosort
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fi
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else
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__headscale_debug "No sort directive not supported in this version of bash"
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fi
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fi
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if (((directive & shellCompDirectiveNoFileComp) != 0)); then
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if [[ $(type -t compopt) == builtin ]]; then
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__headscale_debug "Activating no file completion"
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compopt +o default
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else
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__headscale_debug "No file completion directive not supported in this version of bash"
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fi
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fi
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fi
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# Separate activeHelp from normal completions
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local completions=()
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local activeHelp=()
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__headscale_extract_activeHelp
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if (((directive & shellCompDirectiveFilterFileExt) != 0)); then
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# File extension filtering
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local fullFilter filter filteringCmd
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# Do not use quotes around the $completions variable or else newline
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# characters will be kept.
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for filter in ${completions[*]}; do
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fullFilter+="$filter|"
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done
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filteringCmd="_filedir $fullFilter"
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__headscale_debug "File filtering command: $filteringCmd"
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$filteringCmd
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elif (((directive & shellCompDirectiveFilterDirs) != 0)); then
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# File completion for directories only
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local subdir
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subdir=${completions[0]}
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if [[ -n $subdir ]]; then
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__headscale_debug "Listing directories in $subdir"
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pushd "$subdir" >/dev/null 2>&1 && _filedir -d && popd >/dev/null 2>&1 || return
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else
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__headscale_debug "Listing directories in ."
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_filedir -d
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fi
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else
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__headscale_handle_completion_types
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fi
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__headscale_handle_special_char "$cur" :
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__headscale_handle_special_char "$cur" =
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# Print the activeHelp statements before we finish
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if ((${#activeHelp[*]} != 0)); then
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printf "\n";
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printf "%s\n" "${activeHelp[@]}"
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printf "\n"
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# The prompt format is only available from bash 4.4.
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# We test if it is available before using it.
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if (x=${PS1@P}) 2> /dev/null; then
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printf "%s" "${PS1@P}${COMP_LINE[@]}"
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else
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# Can't print the prompt. Just print the
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# text the user had typed, it is workable enough.
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printf "%s" "${COMP_LINE[@]}"
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fi
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fi
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}
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# Separate activeHelp lines from real completions.
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# Fills the $activeHelp and $completions arrays.
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__headscale_extract_activeHelp() {
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local activeHelpMarker="_activeHelp_ "
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local endIndex=${#activeHelpMarker}
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while IFS='' read -r comp; do
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if [[ ${comp:0:endIndex} == $activeHelpMarker ]]; then
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comp=${comp:endIndex}
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__headscale_debug "ActiveHelp found: $comp"
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if [[ -n $comp ]]; then
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activeHelp+=("$comp")
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fi
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else
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# Not an activeHelp line but a normal completion
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completions+=("$comp")
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fi
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done <<<"${out}"
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}
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__headscale_handle_completion_types() {
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__headscale_debug "__headscale_handle_completion_types: COMP_TYPE is $COMP_TYPE"
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case $COMP_TYPE in
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37|42)
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# Type: menu-complete/menu-complete-backward and insert-completions
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# If the user requested inserting one completion at a time, or all
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# completions at once on the command-line we must remove the descriptions.
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# https://github.com/spf13/cobra/issues/1508
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local tab=$'\t' comp
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while IFS='' read -r comp; do
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[[ -z $comp ]] && continue
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# Strip any description
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comp=${comp%%$tab*}
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# Only consider the completions that match
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if [[ $comp == "$cur"* ]]; then
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COMPREPLY+=("$comp")
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fi
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done < <(printf "%s\n" "${completions[@]}")
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;;
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*)
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# Type: complete (normal completion)
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__headscale_handle_standard_completion_case
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;;
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esac
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}
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__headscale_handle_standard_completion_case() {
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local tab=$'\t' comp
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# Short circuit to optimize if we don't have descriptions
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if [[ "${completions[*]}" != *$tab* ]]; then
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IFS=$'\n' read -ra COMPREPLY -d '' < <(compgen -W "${completions[*]}" -- "$cur")
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return 0
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fi
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local longest=0
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local compline
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# Look for the longest completion so that we can format things nicely
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while IFS='' read -r compline; do
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[[ -z $compline ]] && continue
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# Strip any description before checking the length
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comp=${compline%%$tab*}
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# Only consider the completions that match
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[[ $comp == "$cur"* ]] || continue
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COMPREPLY+=("$compline")
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if ((${#comp}>longest)); then
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longest=${#comp}
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fi
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done < <(printf "%s\n" "${completions[@]}")
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# If there is a single completion left, remove the description text
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if ((${#COMPREPLY[*]} == 1)); then
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__headscale_debug "COMPREPLY[0]: ${COMPREPLY[0]}"
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comp="${COMPREPLY[0]%%$tab*}"
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__headscale_debug "Removed description from single completion, which is now: ${comp}"
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COMPREPLY[0]=$comp
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else # Format the descriptions
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__headscale_format_comp_descriptions $longest
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fi
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}
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__headscale_handle_special_char()
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{
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local comp="$1"
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local char=$2
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if [[ "$comp" == *${char}* && "$COMP_WORDBREAKS" == *${char}* ]]; then
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local word=${comp%"${comp##*${char}}"}
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local idx=${#COMPREPLY[*]}
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while ((--idx >= 0)); do
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COMPREPLY[idx]=${COMPREPLY[idx]#"$word"}
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done
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fi
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}
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__headscale_format_comp_descriptions()
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{
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local tab=$'\t'
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local comp desc maxdesclength
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local longest=$1
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local i ci
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for ci in ${!COMPREPLY[*]}; do
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comp=${COMPREPLY[ci]}
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# Properly format the description string which follows a tab character if there is one
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if [[ "$comp" == *$tab* ]]; then
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__headscale_debug "Original comp: $comp"
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desc=${comp#*$tab}
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comp=${comp%%$tab*}
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# $COLUMNS stores the current shell width.
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# Remove an extra 4 because we add 2 spaces and 2 parentheses.
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maxdesclength=$(( COLUMNS - longest - 4 ))
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# Make sure we can fit a description of at least 8 characters
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# if we are to align the descriptions.
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if ((maxdesclength > 8)); then
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# Add the proper number of spaces to align the descriptions
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for ((i = ${#comp} ; i < longest ; i++)); do
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comp+=" "
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done
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else
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# Don't pad the descriptions so we can fit more text after the completion
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maxdesclength=$(( COLUMNS - ${#comp} - 4 ))
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fi
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# If there is enough space for any description text,
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# truncate the descriptions that are too long for the shell width
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if ((maxdesclength > 0)); then
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if ((${#desc} > maxdesclength)); then
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desc=${desc:0:$(( maxdesclength - 1 ))}
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desc+="…"
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fi
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comp+=" ($desc)"
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fi
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COMPREPLY[ci]=$comp
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__headscale_debug "Final comp: $comp"
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fi
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done
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}
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__start_headscale()
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{
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local cur prev words cword split
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COMPREPLY=()
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# Call _init_completion from the bash-completion package
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# to prepare the arguments properly
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if declare -F _init_completion >/dev/null 2>&1; then
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_init_completion -n =: || return
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else
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__headscale_init_completion -n =: || return
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fi
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__headscale_debug
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__headscale_debug "========= starting completion logic =========="
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__headscale_debug "cur is ${cur}, words[*] is ${words[*]}, #words[@] is ${#words[@]}, cword is $cword"
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# The user could have moved the cursor backwards on the command-line.
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# We need to trigger completion from the $cword location, so we need
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# to truncate the command-line ($words) up to the $cword location.
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words=("${words[@]:0:$cword+1}")
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__headscale_debug "Truncated words[*]: ${words[*]},"
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local out directive
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__headscale_get_completion_results
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__headscale_process_completion_results
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}
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if [[ $(type -t compopt) = "builtin" ]]; then
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complete -o default -F __start_headscale headscale
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else
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complete -o default -o nospace -F __start_headscale headscale
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fi
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# ex: ts=4 sw=4 et filetype=sh
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