mirror of
https://github.com/nboughton/dotfiles
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260 lines
8.4 KiB
Bash
260 lines
8.4 KiB
Bash
# bash completion V2 for swnt -*- shell-script -*-
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__swnt_debug()
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{
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if [[ -n ${BASH_COMP_DEBUG_FILE:-} ]]; then
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echo "$*" >> "${BASH_COMP_DEBUG_FILE}"
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fi
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}
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# Macs have bash3 for which the bash-completion package doesn't include
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# _init_completion. This is a minimal version of that function.
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__swnt_init_completion()
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{
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COMPREPLY=()
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_get_comp_words_by_ref "$@" cur prev words cword
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}
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# This function calls the swnt program to obtain the completion
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# results and the directive. It fills the 'out' and 'directive' vars.
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__swnt_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 ${words[0]} instead of directly swnt allows to handle aliases
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args=("${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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__swnt_debug "lastParam ${lastParam}, lastChar ${lastChar}"
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if [ -z "${cur}" ] && [ "${lastChar}" != "=" ]; then
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# If the last parameter is complete (there is a space following it)
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# We add an extra empty parameter so we can indicate this to the go method.
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__swnt_debug "Adding extra empty parameter"
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requestComp="${requestComp} ''"
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fi
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# When completing a flag with an = (e.g., swnt -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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__swnt_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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__swnt_debug "The completion directive is: ${directive}"
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__swnt_debug "The completions are: ${out[*]}"
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}
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__swnt_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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if [ $((directive & shellCompDirectiveError)) -ne 0 ]; then
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# Error code. No completion.
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__swnt_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)) -ne 0 ]; then
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if [[ $(type -t compopt) = "builtin" ]]; then
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__swnt_debug "Activating no space"
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compopt -o nospace
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else
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__swnt_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 & shellCompDirectiveNoFileComp)) -ne 0 ]; then
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if [[ $(type -t compopt) = "builtin" ]]; then
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__swnt_debug "Activating no file completion"
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compopt +o default
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else
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__swnt_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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if [ $((directive & shellCompDirectiveFilterFileExt)) -ne 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 $out variable or else newline
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# characters will be kept.
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for filter in ${out[*]}; do
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fullFilter+="$filter|"
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done
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filteringCmd="_filedir $fullFilter"
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__swnt_debug "File filtering command: $filteringCmd"
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$filteringCmd
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elif [ $((directive & shellCompDirectiveFilterDirs)) -ne 0 ]; then
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# File completion for directories only
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# Use printf to strip any trailing newline
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local subdir
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subdir=$(printf "%s" "${out[0]}")
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if [ -n "$subdir" ]; then
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__swnt_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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__swnt_debug "Listing directories in ."
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_filedir -d
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fi
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else
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__swnt_handle_standard_completion_case
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fi
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__swnt_handle_special_char "$cur" :
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__swnt_handle_special_char "$cur" =
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}
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__swnt_handle_standard_completion_case() {
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local tab comp
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tab=$(printf '\t')
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local longest=0
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# Look for the longest completion so that we can format things nicely
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while IFS='' read -r comp; do
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# Strip any description before checking the length
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comp=${comp%%$tab*}
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# Only consider the completions that match
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comp=$(compgen -W "$comp" -- "$cur")
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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" "${out[@]}")
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local completions=()
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while IFS='' read -r comp; do
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if [ -z "$comp" ]; then
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continue
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fi
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__swnt_debug "Original comp: $comp"
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comp="$(__swnt_format_comp_descriptions "$comp" "$longest")"
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__swnt_debug "Final comp: $comp"
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completions+=("$comp")
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done < <(printf "%s\n" "${out[@]}")
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while IFS='' read -r comp; do
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COMPREPLY+=("$comp")
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done < <(compgen -W "${completions[*]}" -- "$cur")
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# If there is a single completion left, remove the description text
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if [ ${#COMPREPLY[*]} -eq 1 ]; then
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__swnt_debug "COMPREPLY[0]: ${COMPREPLY[0]}"
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comp="${COMPREPLY[0]%% *}"
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__swnt_debug "Removed description from single completion, which is now: ${comp}"
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COMPREPLY=()
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COMPREPLY+=("$comp")
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fi
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}
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__swnt_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 [[ $((--idx)) -ge 0 ]]; do
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COMPREPLY[$idx]=${COMPREPLY[$idx]#"$word"}
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done
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fi
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}
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__swnt_format_comp_descriptions()
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{
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local tab
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tab=$(printf '\t')
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local comp="$1"
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local longest=$2
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# Properly format the description string which follows a tab character if there is one
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if [[ "$comp" == *$tab* ]]; then
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desc=${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 -gt 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 -gt 0 ]; then
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if [ ${#desc} -gt $maxdesclength ]; then
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desc=${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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fi
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# Must use printf to escape all special characters
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printf "%q" "${comp}"
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}
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__start_swnt()
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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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__swnt_init_completion -n "=:" || return
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fi
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__swnt_debug
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__swnt_debug "========= starting completion logic =========="
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__swnt_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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__swnt_debug "Truncated words[*]: ${words[*]},"
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local out directive
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__swnt_get_completion_results
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__swnt_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_swnt swnt
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else
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complete -o default -o nospace -F __start_swnt swnt
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fi
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# ex: ts=4 sw=4 et filetype=sh
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