fix (completion): remove file dependencies and add more completion for options

completion/available/capistrano.completion.bash

@@ -1,24 +1,36 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 # Bash completion support for Capistrano.
 
 export COMP_WORDBREAKS=${COMP_WORDBREAKS/\:/}
 
-_capcomplete() {
-    if [ -f Capfile ]; then
-        recent=`ls -t .cap_tasks~ Capfile **/*.cap 2> /dev/null | head -n 1`
-        if [[ $recent != '.cap_tasks~' ]]; then
-            cap --version | grep 'Capistrano v2.' > /dev/null
-            if [ $? -eq 0 ]; then
-              # Capistrano 2.x
-              cap --tool --verbose --tasks | cut -d " " -f 2 > .cap_tasks~
-            else
-              # Capistrano 3.x
-              cap --all --tasks | cut -d " " -f 2 > .cap_tasks~
-            fi
-        fi
-        COMPREPLY=($(compgen -W "`cat .cap_tasks~`" -- ${COMP_WORDS[COMP_CWORD]}))
-        return 0
-    fi
-}
+if _command_exists cap; then
+	function __cap_completions() {
+		[[ ! -f Capfile ]] && return 1
 
-complete -o default -o nospace -F _capcomplete cap
+		local cword
+		cword=$(_get_cword)
+
+		case $cword in
+			-*)
+				# Complete options
+				COMPREPLY=(--{suppress-,}backtrace --comments --job-stats --rules -A --all -B --build-all -C --directory -D --describe -e -E --execute{,-continue,-print} -f --rakefile
+					-G --{no{-,},}system -g -I --libdir -j --jobs -m --multitask -N --no{-,}search -P --prereqs --require -R --rakelib{dir,} -t --trace -T --tasks -W --where -X --no-deprecation-warning
+					-V --version -n --dry-run -r --roles -z --hosts -p --print-config-variables -h -H --help)
+				;;
+
+			*)
+				# Complete tasks
+				if cap --version | grep 'Capistrano v2.' > /dev/null; then
+					# Capistrano 2.x
+					read -ra COMPREPLY < <(cap --tool --verbose --tasks | awk '{print $2}' | tr '\n' ' ')
+				else
+					# Capistrano 3.x
+					read -ra COMPREPLY < <(cap --all --tasks | awk '{print $2}' | tr '\n' ' ')
+				fi
+				;;
+
+		esac
+	}
+
+	complete -F __cap_completions -X "!&*" cap
+fi