Use array for default users

This also avoids shelling out to `whoami` always, and only uses `$USER`
by default.

config.example

@@ -75,9 +75,9 @@ clip_clear=45
 # open new password entries in editor
 edit_new_pass="true"
 
-# default_user is also used for password files that have no user field.
-#default_user="${ROFI_PASS_DEFAULT_USER-$(whoami)}"
-#default_user2=mary_ann
+# The first entry from default_users is also used for password files that have
+# no user field.
+#default_users=(${ROFI_PASS_DEFAULT_USER-$(whoami)})
 #password_length=12
 
 # Custom Keybindings

rofi-pass

@@ -29,8 +29,7 @@ notify='false'
 help_color=""
 clip=primary
 clip_clear=45
-default_user="${ROFI_PASS_DEFAULT_USER-$(whoami)}"
-default_user2=john_doe
+default_users=("${ROFI_PASS_DEFAULT_USER-$(whoami)}")
 password_length=12
 fix_layout=false
 
@@ -418,12 +417,12 @@ mainMenu () {
 		fi
 	fi
 	if [[ -z "${stuff["${USERNAME_field}"]}" ]]; then
-		if [[ -n $default_user ]]; then
-			if [[ "$default_user" == ":filename" ]]; then
-		    	stuff["${USERNAME_field}"]="$(basename $selected_password)"
-		    else
-		    	stuff["${USERNAME_field}"]="${default_user}"
-    		fi
+		if [[ -n ${default_users[0]} ]]; then
+			if [[ "${default_users[0]}" == ":filename" ]]; then
+				stuff["${USERNAME_field}"]="$(basename $selected_password)"
+			else
+				stuff["${USERNAME_field}"]="${default_users[0]}"
+			fi
 		fi
 	fi
 	pass_content="$(for key in "${!stuff[@]}"; do printf '%s\n' "${key}: ${stuff[$key]}"; done)"
@@ -690,11 +689,7 @@ insertPass () {
 		exit
 	fi
 
-	user_content=("${default_user2}"
-		"${USER}"
-		"${default_user}")
-
-	user=$(printf '%s\n' "${user_content[@]}" | _rofi -dmenu -mesg "Chose Username or type" -p "> ")
+	user=$(printf '%s\n' "${default_users[@]}" | _rofi -dmenu -mesg "Chose Username or type" -p "> ")
 	val=$?
 
 	if [[ $val -eq 1 ]]; then
@@ -791,6 +786,23 @@ main () {
 	config_file="$(get_config_file)"
 	[[ ! -z "$config_file" ]] && source "$config_file"
 
+	# Handle deprecated default_user/default_user2 config.
+	if [[ -z "${default_users[*]}" ]]; then
+		# shellcheck disable=SC2154
+		if [[ -n "$default_user" ]]; then
+			default_users+=("$default_user")
+		fi
+		# shellcheck disable=SC2154
+		if [[ -n "$default_user2" ]]; then
+			default_users+=("$default_user2")
+		fi
+		if [[ ${#default_users[@]} -eq 0 ]]; then
+			default_users=("$USER")
+		fi
+	else
+		default_users=("$USER")
+	fi
+
 	# create tmp dir
 	if [[ ! -d "$HOME/.cache/rofi-pass" ]]; then
 		mkdir "$HOME/.cache/rofi-pass"