switch code indentation to hard tabs

also update code guidelines.

doc/HACKING.txt

@@ -4,11 +4,7 @@ Style guidelines
 Indentation
 -----------
 
-Code must be indented using four spaces.
-In vim, this can be accomplished using
-
-	set shiftwidth=4
-	set expandtab
+Code must be indented using hard tabs.
 
 Naming
 ------

tomb

@@ -176,7 +176,7 @@ TRAPSTOP() { _endgame STOP  }
 _cat() { local -a _arr;
 		 # read file using mapfile, newline fix
 		 _arr=("${(f@)${mapfile[${1}]%$'\n'}}"); print "$_arr"
-}
+	   }
 
 _is_found() {
 	# returns 0 if binary is found in path
@@ -1651,7 +1651,7 @@ forge_key() {
 	[[ -z "$destkey" ]] && {
 		_failure "A filename needs to be specified using -k to forge a new key." }
 
-#    _message "Commanded to forge key ::1 key::" $destkey
+	#	 _message "Commanded to forge key ::1 key::" $destkey
 
 	_check_swap # Ensure the available memory is safe to use
 
@@ -2029,9 +2029,8 @@ mount_tomb() {
 	{ option_is_set -o } && {
 		local oldmountopts=$MOUNTOPTS
 		MOUNTOPTS="$(option_value -o)" }
-
 	# TODO: safety check MOUNTOPTS
-    # safe_mount_options && \
+	# safe_mount_options &&
 	_sudo mount -o $MOUNTOPTS /dev/mapper/${mapper} ${tombmount}
 	# Clean up if the mount failed
 	[[ $? == 0 ]] || {
@@ -3138,6 +3137,3 @@ EOF
 main "$@" || exit $?   # Prevent `source tomb source` from exiting
 
 # }}}
-
-# -*- tab-width: 4; indent-tabs-mode:nil; -*-
-# vim: set shiftwidth=4 expandtab: