bacman: small code cleanup

This includes:
 - Quoting fixes.
 - Drop deprecated mktemp option -p.
 - Set extglob nullglob shell options at the top.
 - Use extended globbing instead of regex to match %HEADER% in pacman db.

Signed-off-by: lolilolicon <lolilolicon@gmail.com>

contrib/bacman.in

@@ -20,6 +20,9 @@
 #   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
+shopt -s extglob
+shopt -s nullglob
+
 readonly progname="bacman"
 readonly progver="0.2.1"
 
@@ -109,8 +112,8 @@ fi
 #
 # Begin
 #
-echo Package: ${pkg_namver}
-work_dir=$(mktemp -d -p /tmp)
+echo "Package: ${pkg_namver}"
+work_dir=$(mktemp -d --tmpdir bacman.XXXXXXXXXX)
 cd "$work_dir" || exit 1
 
 #
@@ -124,12 +127,12 @@ while read i; do
 		continue
 	fi
 
-	if [[ "$i" =~ %[A-Z]*% ]]; then
+	if [[ $i == %+([A-Z])% ]]; then
 		current=$i
 		continue
 	fi
 
-	case $current in
+	case "$current" in
 		%FILES%)
 			ret=0
 			if [[ -e /$i ]]; then
@@ -163,6 +166,7 @@ pkg_size=$(du -sk | awk '{print $1 * 1024}')
 
 #
 # .PKGINFO stuff
+# TODO adopt makepkg's write_pkginfo() into this or scripts/library
 #
 echo Generating .PKGINFO metadata...
 echo "# Generated by $progname $progver"    > .PKGINFO
@@ -174,11 +178,11 @@ echo "#"                    >> .PKGINFO
 
 cat "$pkg_dir"/{desc,files} |
 while read i; do
-	if [[ -z "$i" ]]; then
+	if [[ -z $i ]]; then
 		continue;
 	fi
 
-	if [[ "$i" =~ %[A-Z]*% ]]; then
+	if [[ $i == %+([A-Z])% ]]; then
 		current=$i
 		continue
 	fi
@@ -273,9 +277,6 @@ esac
 pkg_file="$pkg_dest/$pkg_namver-$pkg_arch${PKGEXT}"
 ret=0
 
-# when fileglobbing, we want * in an empty directory to expand to
-# the null string rather than itself
-shopt -s nullglob
 # TODO: Maybe this can be set globally for robustness
 shopt -s -o pipefail
 bsdtar -cf - $comp_files * |
@@ -284,7 +285,7 @@ case "$PKGEXT" in
 	*tar.bz2) bzip2 -c -f ;;
 	*tar.xz)  xz -c -z - ;;
 	*tar)     cat ;;
-esac > ${pkg_file} || ret=$?
+esac > "${pkg_file}"; ret=$?
 
 if (( ret )); then
 	echo "ERROR: unable to write package to $pkg_dest"