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#!/bin/bash
#
# Bash completion generated for '{{name}}' at {{date}}.
#
# The original template lives here:
# https://github.com/trentm/node-dashdash/blob/master/etc/dashdash.bash_completion.in
#
#
# Copyright 2016 Trent Mick
# Copyright 2016 Joyent, Inc.
#
#
# A generic Bash completion driver script.
#
# This is meant to provide a re-usable chunk of Bash to use for
# "etc/bash_completion.d/" files for individual tools. Only the "Configuration"
# section with tool-specific info need differ. Features:
#
# - support for short and long opts
# - support for knowing which options take arguments
# - support for subcommands (e.g. 'git log <TAB>' to show just options for the
# log subcommand)
# - does the right thing with "--" to stop options
# - custom optarg and arg types for custom completions
# - (TODO) support for shells other than Bash (tcsh, zsh, fish?, etc.)
#
#
# Examples/design:
#
# 1. Bash "default" completion. By default Bash's 'complete -o default' is
# enabled. That means when there are no completions (e.g. if no opts match
# the current word), then you'll get Bash's default completion. Most notably
# that means you get filename completion. E.g.:
# $ tool ./<TAB>
# $ tool READ<TAB>
#
# 2. all opts and subcmds:
# $ tool <TAB>
# $ tool -v <TAB> # assuming '-v' doesn't take an arg
# $ tool -<TAB> # matching opts
# $ git lo<TAB> # matching subcmds
#
# Long opt completions are given *without* the '=', i.e. we prefer space
# separated because that's easier for good completions.
#
# 3. long opt arg with '='
# $ tool --file=<TAB>
# $ tool --file=./d<TAB>
# We maintain the "--file=" prefix. Limitation: With the attached prefix
# the 'complete -o filenames' doesn't know to do dirname '/' suffixing. Meh.
#
# 4. envvars:
# $ tool $<TAB>
# $ tool $P<TAB>
# Limitation: Currently only getting exported vars, so we miss "PS1" and
# others.
#
# 5. Defer to other completion in a subshell:
# $ tool --file $(cat ./<TAB>
# We get this from 'complete -o default ...'.
#
# 6. Custom completion types from a provided bash function.
# $ tool --profile <TAB> # complete available "profiles"
#
#
# Dev Notes:
# - compgen notes, from http://unix.stackexchange.com/questions/151118/understand-compgen-builtin-command
# - https://www.gnu.org/software/bash/manual/html_node/Programmable-Completion-Builtins.html
#
# Debugging this completion:
# 1. Uncomment the "_{{name}}_log_file=..." line.
# 2. 'tail -f /var/tmp/dashdash-completion.log' in one terminal.
# 3. Re-source this bash completion file.
#_{{name}}_log=/var/tmp/dashdash-completion.log
function _{{name}}_completer {
# ---- cmd definition
{{spec}}
# ---- locals
declare -a argv
# ---- support functions
function trace {
[[ -n "$_{{name}}_log" ]] && echo "$*" >&2
}
function _dashdash_complete {
local idx context
idx=$1
context=$2
local shortopts longopts optargs subcmds allsubcmds argtypes
shortopts="$(eval "echo \${cmd${context}_shortopts}")"
longopts="$(eval "echo \${cmd${context}_longopts}")"
optargs="$(eval "echo \${cmd${context}_optargs}")"
subcmds="$(eval "echo \${cmd${context}_subcmds}")"
allsubcmds="$(eval "echo \${cmd${context}_allsubcmds}")"
IFS=', ' read -r -a argtypes <<< "$(eval "echo \${cmd${context}_argtypes}")"
trace ""
trace "_dashdash_complete(idx=$idx, context=$context)"
trace " shortopts: $shortopts"
trace " longopts: $longopts"
trace " optargs: $optargs"
trace " subcmds: $subcmds"
trace " allsubcmds: $allsubcmds"
# Get 'state' of option parsing at this COMP_POINT.
# Copying "dashdash.js#parse()" behaviour here.
local state=
local nargs=0
local i=$idx
local argtype
local optname
local prefix
local word
local dashdashseen=
while [[ $i -lt $len && $i -le $COMP_CWORD ]]; do
argtype=
optname=
prefix=
word=
arg=${argv[$i]}
trace " consider argv[$i]: '$arg'"
if [[ "$arg" == "--" && $i -lt $COMP_CWORD ]]; then
trace " dashdash seen"
dashdashseen=yes
state=arg
word=$arg
elif [[ -z "$dashdashseen" && "${arg:0:2}" == "--" ]]; then
arg=${arg:2}
if [[ "$arg" == *"="* ]]; then
optname=${arg%%=*}
val=${arg##*=}
trace " long opt: optname='$optname' val='$val'"
state=arg
argtype=$(echo "$optargs" | awk -F "-$optname=" '{print $2}' | cut -d' ' -f1)
word=$val
prefix="--$optname="
else
optname=$arg
val=
trace " long opt: optname='$optname'"
state=longopt
word=--$optname
if [[ "$optargs" == *"-$optname="* && $i -lt $COMP_CWORD ]]; then
i=$(( $i + 1 ))
state=arg
argtype=$(echo "$optargs" | awk -F "-$optname=" '{print $2}' | cut -d' ' -f1)
word=${argv[$i]}
trace " takes arg (consume argv[$i], word='$word')"
fi
fi
elif [[ -z "$dashdashseen" && "${arg:0:1}" == "-" ]]; then
trace " short opt group"
state=shortopt
word=$arg
local j=1
while [[ $j -lt ${#arg} ]]; do
optname=${arg:$j:1}
trace " consider index $j: optname '$optname'"
if [[ "$optargs" == *"-$optname="* ]]; then
argtype=$(echo "$optargs" | awk -F "-$optname=" '{print $2}' | cut -d' ' -f1)
if [[ $(( $j + 1 )) -lt ${#arg} ]]; then
state=arg
word=${arg:$(( $j + 1 ))}
trace " takes arg (rest of this arg, word='$word', argtype='$argtype')"
elif [[ $i -lt $COMP_CWORD ]]; then
state=arg
i=$(( $i + 1 ))
word=${argv[$i]}
trace " takes arg (word='$word', argtype='$argtype')"
fi
break
fi
j=$(( $j + 1 ))
done
elif [[ $i -lt $COMP_CWORD && -n "$arg" ]] && $(echo "$allsubcmds" | grep -w "$arg" >/dev/null); then
trace " complete subcmd: recurse _dashdash_complete"
_dashdash_complete $(( $i + 1 )) "${context}__${arg/-/_}"
return
else
trace " not an opt or a complete subcmd"
state=arg
word=$arg
nargs=$(( $nargs + 1 ))
if [[ ${#argtypes[@]} -gt 0 ]]; then
argtype="${argtypes[$(( $nargs - 1 ))]}"
if [[ -z "$argtype" ]]; then
# If we have more args than argtypes, we use the
# last type.
argtype="${argtypes[@]: -1:1}"
fi
fi
fi
trace " state=$state prefix='$prefix' word='$word'"
i=$(( $i + 1 ))
done
trace " parsed: state=$state optname='$optname' argtype='$argtype' prefix='$prefix' word='$word' dashdashseen=$dashdashseen"
local compgen_opts=
if [[ -n "$prefix" ]]; then
compgen_opts="$compgen_opts -P $prefix"
fi
case $state in
shortopt)
compgen $compgen_opts -W "$shortopts $longopts" -- "$word"
;;
longopt)
compgen $compgen_opts -W "$longopts" -- "$word"
;;
arg)
# If we don't know what completion to do, then emit nothing. We
# expect that we are running with:
# complete -o default ...
# where "default" means: "Use Readline's default completion if
# the compspec generates no matches." This gives us the good filename
# completion, completion in subshells/backticks.
#
# We cannot support an argtype="directory" because
# compgen -S '/' -A directory -- "$word"
# doesn't give a satisfying result. It doesn't stop at the trailing '/'
# so you cannot descend into dirs.
if [[ "${word:0:1}" == '$' ]]; then
# By default, Bash will complete '$<TAB>' to all envvars. Apparently
# 'complete -o default' does *not* give us that. The following
# gets *close* to the same completions: '-A export' misses envvars
# like "PS1".
trace " completing envvars"
compgen $compgen_opts -P '$' -A export -- "${word:1}"
elif [[ -z "$argtype" ]]; then
# Only include opts in completions if $word is not empty.
# This is to avoid completing the leading '-', which foils
# using 'default' completion.
if [[ -n "$dashdashseen" ]]; then
trace " completing subcmds, if any (no argtype, dashdash seen)"
compgen $compgen_opts -W "$subcmds" -- "$word"
elif [[ -z "$word" ]]; then
trace " completing subcmds, if any (no argtype, empty word)"
compgen $compgen_opts -W "$subcmds" -- "$word"
else
trace " completing opts & subcmds (no argtype)"
compgen $compgen_opts -W "$shortopts $longopts $subcmds" -- "$word"
fi
elif [[ $argtype == "none" ]]; then
# We want *no* completions, i.e. some way to get the active
# 'complete -o default' to not do filename completion.
trace " completing 'none' (hack to imply no completions)"
echo "##-no-completion- -results-##"
elif [[ $argtype == "file" ]]; then
# 'complete -o default' gives the best filename completion, at least
# on Mac.
trace " completing 'file' (let 'complete -o default' handle it)"
echo ""
elif ! type complete_$argtype 2>/dev/null >/dev/null; then
trace " completing '$argtype' (fallback to default b/c complete_$argtype is unknown)"
echo ""
else
trace " completing custom '$argtype'"
completions=$(complete_$argtype "$word")
if [[ -z "$completions" ]]; then
trace " no custom '$argtype' completions"
# These are in ascii and "dictionary" order so they sort
# correctly.
echo "##-no-completion- -results-##"
else
echo $completions
fi
fi
;;
*)
trace " unknown state: $state"
;;
esac
}
trace ""
trace "-- $(date)"
#trace "\$IFS: '$IFS'"
#trace "\$@: '$@'"
#trace "COMP_WORDBREAKS: '$COMP_WORDBREAKS'"
trace "COMP_CWORD: '$COMP_CWORD'"
trace "COMP_LINE: '$COMP_LINE'"
trace "COMP_POINT: $COMP_POINT"
# Guard against negative COMP_CWORD. This is a Bash bug at least on
# Mac 10.10.4's bash. See
# <https://lists.gnu.org/archive/html/bug-bash/2009-07/msg00125.html>.
if [[ $COMP_CWORD -lt 0 ]]; then
trace "abort on negative COMP_CWORD"
exit 1;
fi
# I don't know how to do array manip on argv vars,
# so copy over to argv array to work on them.
shift # the leading '--'
i=0
len=$#
while [[ $# -gt 0 ]]; do
argv[$i]=$1
shift;
i=$(( $i + 1 ))
done
trace "argv: '${argv[@]}'"
trace "argv[COMP_CWORD-1]: '${argv[$(( $COMP_CWORD - 1 ))]}'"
trace "argv[COMP_CWORD]: '${argv[$COMP_CWORD]}'"
trace "argv len: '$len'"
_dashdash_complete 1 ""
}
# ---- mainline
# Note: This if-block to help work with 'compdef' and 'compctl' is
# adapted from 'npm completion'.
if type complete &>/dev/null; then
function _{{name}}_completion {
local _log_file=/dev/null
[[ -z "$_{{name}}_log" ]] || _log_file="$_{{name}}_log"
COMPREPLY=($(COMP_CWORD="$COMP_CWORD" \
COMP_LINE="$COMP_LINE" \
COMP_POINT="$COMP_POINT" \
_{{name}}_completer -- "${COMP_WORDS[@]}" \
2>$_log_file)) || return $?
}
complete -o default -F _{{name}}_completion {{name}}
elif type compdef &>/dev/null; then
function _{{name}}_completion {
local _log_file=/dev/null
[[ -z "$_{{name}}_log" ]] || _log_file="$_{{name}}_log"
compadd -- $(COMP_CWORD=$((CURRENT-1)) \
COMP_LINE=$BUFFER \
COMP_POINT=0 \
_{{name}}_completer -- "${words[@]}" \
2>$_log_file)
}
compdef _{{name}}_completion {{name}}
elif type compctl &>/dev/null; then
function _{{name}}_completion {
local cword line point words si
read -Ac words
read -cn cword
let cword-=1
read -l line
read -ln point
local _log_file=/dev/null
[[ -z "$_{{name}}_log" ]] || _log_file="$_{{name}}_log"
reply=($(COMP_CWORD="$cword" \
COMP_LINE="$line" \
COMP_POINT="$point" \
_{{name}}_completer -- "${words[@]}" \
2>$_log_file)) || return $?
}
compctl -K _{{name}}_completion {{name}}
fi
##
## This is a Bash completion file for the '{{name}}' command. You can install
## with either:
##
## cp FILE /usr/local/etc/bash_completion.d/{{name}} # Mac
## cp FILE /etc/bash_completion.d/{{name}} # Linux
##
## or:
##
## cp FILE > ~/.{{name}}.completion
## echo "source ~/.{{name}}.completion" >> ~/.bashrc
##