Revert "Remove unnecessary quoting"

This reverts commit ef1a9c6.

Author: Oliver Weiler

src/main/bash/sdkman-env.sh

@@ -17,15 +17,15 @@
 #
 
 function __sdk_env() {
-	SDKMANRC=.sdkmanrc
+	SDKMANRC=".sdkmanrc"
 
-	if [[ $1 == init ]]; then
+	if [[ "$1" == "init" ]]; then
 		__sdkman_generate_sdkmanrc
 
 		return 0
 	fi
 
-	if [[ ! -f $SDKMANRC ]]; then
+	if [[ ! -f "$SDKMANRC" ]]; then
 		__sdkman_echo_red "Could not find $SDKMANRC in the current directory."
 		echo ""
 		__sdkman_echo_yellow "Run 'sdk env init' to create it."
@@ -35,7 +35,7 @@ function __sdk_env() {
 
 	while IFS= read -r line || [[ -n "$line" ]]; do
 		local normalised_line
-		normalised_line=$(__sdkman_normalise "$line")
+		normalised_line="$(__sdkman_normalise "$line")"
 
 		__sdkman_is_blank_line "$normalised_line" && continue
 
@@ -52,32 +52,32 @@ function __sdk_env() {
 }
 
 function __sdkman_generate_sdkmanrc() {
-	if [[ -f $SDKMANRC ]]; then
+	if [[ -f "$SDKMANRC" ]]; then
 		__sdkman_echo_red "$SDKMANRC already exists!"
 
 		return 1
 	fi
 
-	__sdkman_determine_current_version 'java'
+	__sdkman_determine_current_version "java"
 
 	local version
-	[[ -n $CURRENT ]] && version=$CURRENT || version=$(__sdkman_secure_curl "${SDKMAN_CANDIDATES_API}/candidates/default/java")
+	[[ -n "$CURRENT" ]] && version="$CURRENT" || version="$(__sdkman_secure_curl "${SDKMAN_CANDIDATES_API}/candidates/default/java")"
 
 	echo "java=$version" > "$SDKMANRC"
 
 	__sdkman_echo_green "$SDKMANRC created."
 }
 
 function __sdkman_is_blank_line() {
-	[[ -z $1 ]]
+	[[ -z "$1" ]]
 }
 
 function __sdkman_normalise() {
-	local line_without_comments=${1/\#*/}
+	local line_without_comments="${1/\#*/}"
 
 	echo "${line_without_comments//[[:space:]]/}"
 }
 
 function __sdkman_matches_candidate_format() {
-	[[ $1 =~ ^[[:lower:]]+\=.+$ ]]
+	[[ "$1" =~ ^[[:lower:]]+\=.+$ ]]
 }