pacdiff: provide an --output option to show any .pac* files

This is an option to just echo's the pacnews/pacsaves instead of merging
or removing them. This can be used to check the config status such as in
a cron job without modifying the system.

Signed-off-by: Jonathan Frazier <eyeswide@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

contrib/pacdiff.sh.in

@@ -27,7 +27,7 @@ diffprog=${DIFFPROG:-vimdiff}
 diffsearchpath=${DIFFSEARCHPATH:-/etc}
 USE_COLOR='y'
 declare -a oldsaves
-declare -i USE_FIND=0 USE_LOCATE=0 USE_PACDB=0
+declare -i USE_FIND=0 USE_LOCATE=0 USE_PACDB=0 OUTPUTONLY=0
 
 m4_include(../scripts/library/output_format.sh)
 
@@ -43,6 +43,7 @@ Search Options:     select one, default: pacmandb
   -p/--pacmandb     scan active config files from pacman db
 
 General Options:
+  -o/--output       print files instead of merging them
   --nocolor         remove colors from output
 
 Enviroment Variables:
@@ -51,6 +52,7 @@ Enviroment Variables:
                     (default: /etc)
 
 Example: DIFFPROG=meld DIFFSEARCHPATH="/boot /etc /usr" $myname
+Example: $myname --output --locate
 
 EOF
 }
@@ -98,6 +100,8 @@ while [[ -n "$1" ]]; do
 			USE_FIND=1;;
 		-p|--pacmandb)
 			USE_PACDB=1;;
+		-o|--output)
+			OUTPUTONLY=1;;
 		--nocolor)
 			USE_COLOR='n';;
 		-V|--version)
@@ -136,6 +140,11 @@ fi
 while IFS= read -u 3 -r -d '' pacfile; do
 	file="${pacfile%.pac*}"
 	file_type="pac${pacfile##*.pac}"
+	
+	if (( OUTPUTONLY )); then
+		echo "$pacfile"
+		continue
+	fi
 
 	# add matches for pacsave.N to oldsaves array, do not prompt
 	if [[ $file_type = pacsave.+([0-9]) ]]; then