formatted composer completion and used helper function

clean_files.txt

@@ -62,6 +62,7 @@ plugins/available/xterm.plugin.bash
 completion/available/awless.completion.bash
 completion/available/brew.completion.bash
 completion/available/cargo.completion.bash
+completion/available/composer.completion.bash
 completion/available/conda.completion.bash
 completion/available/consul.completion.bash
 completion/available/docker.completion.bash

completion/available/composer.completion.bash

@@ -1,20 +1,21 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
+cite "about-completion"
+about-completion "composer completion"
 
-_composer()
-{
+function _composer() {
 	local cur script coms opts com
 	COMPREPLY=()
 	_get_comp_words_by_ref -n : cur words
 
 	# for an alias, get the real script behind it
-    if [[ $(type -t ${words[0]}) == "alias" ]]; then
-        script=$(alias ${words[0]} | sed -E "s/alias ${words[0]}='(.*)'/\1/")
+	if [[ $(type -t "${words[0]}") == "alias" ]]; then
+		script=$(alias "${words[0]}" | sed -E "s/alias ${words[0]}='(.*)'/\1/")
 	else
 		script=${words[0]}
 	fi
 
 	# lookup for command
-    for word in ${words[@]:1}; do
+	for word in "${words[@]:1}"; do
 		if [[ $word != -* ]]; then
 			com=$word
 			break
@@ -22,7 +23,7 @@ _composer()
 	done
 
 	# completing for an option
-    if [[ ${cur} == --* ]] ; then
+	if [[ ${cur} == --* ]]; then
 		opts="--help --quiet --verbose --version --ansi --no-ansi --no-interaction --profile --no-plugins --working-dir"
 
 		case "$com" in
@@ -113,17 +114,17 @@ _composer()
 
 		esac
 
-        COMPREPLY=($(compgen -W "${opts}" -- ${cur}))
+		COMPREPLY=($(compgen -W "${opts}" -- "${cur}"))
 		__ltrim_colon_completions "$cur"
 
-        return 0;
+		return 0
 	fi
 
 	# completing for a command
-    if [[ $cur == $com ]]; then
+	if [[ "$cur" == "$com" ]]; then
 		coms="about archive browse clear-cache config create-project depends diagnose dump-autoload exec global help init install licenses list outdated prohibits remove require run-script search self-update show status suggests update validate"
 
-        COMPREPLY=($(compgen -W "${coms}" -- ${cur}))
+		COMPREPLY=($(compgen -W "${coms}" -- "${cur}"))
 		__ltrim_colon_completions "$cur"
 
 		return 0