Make BASH hook compatible with spaces in completion results

ZSH handles multi-word completion results correctly out of the box, but BASH needed
some prodding to stop it interpreting all space-delimited words as separate
suggestions. There are two parts to this fix:

- The addition of a local `IFS` variable was required to prevent splitting
  from happening inside multi-word completions.

- Spaces needed to be manually escaped when quotes were missing as completing
  as completion was otherwise dumping the raw result without escaping. I haven't
  looked into how filename completion mode handles this without showing
  backslashes in the completion result, but the behaviour here mirrors ZSH so
  this isn't a huge problem.

Custom multi-word completions in BASH aren't particularly intuitive - these
threads were helpful while figuring this solution out:

https://stackoverflow.com/questions/26509260/bash-tab-completion-with-spaces
https://stackoverflow.com/questions/1146098/properly-handling-spaces-and-quotes-in-bash-completion
https://stackoverflow.com/questions/10652492/bash-autocompletion-how-to-pass-this-array-to-compgen-without-significant-whit

Author: stecman

src/HookFactory.php

@@ -41,6 +41,9 @@ function %%function_name%% {
 
     local RESULT STATUS;
 
+    # Force splitting by newline instead of default delimiters
+    local IFS=$'\n'
+
     RESULT="$(%%completion_command%% </dev/null)";
     STATUS=$?;
 
@@ -65,6 +68,11 @@ function %%function_name%% {
 
     COMPREPLY=(`compgen -W "$RESULT" -- $cur`);
 
+    # Escape any spaces in results if the current word doesn't begin with a quote
+    if [[ ! -z $COMPREPLY  ]] && [[ ! $cur =~ ^[\'\"] ]]; then
+        COMPREPLY=($(printf '%q\n' "${COMPREPLY[@]}"));
+    fi;
+
     __ltrim_colon_completions "$cur";
 
     MAILCHECK=mail_check_backup;