perf(pkgbuild-sync): batch installed package checks

.local/bin/pkgbuild-sync

@@ -101,11 +101,14 @@ update_srcinfo() {
 
 all_packages_current() {
     local expected_version
+    local installed_packages
+    local -A installed_versions=()
     local installed_version
     local srcinfo
     local pkg_names
     local pkg_name
     local epoch
+    local line
     local missing=0
     local pkgrel
     local pkgver
@@ -148,15 +151,23 @@ all_packages_current() {
         return 2
     fi
 
+    mapfile -t installed_packages < <(
+        pacman -Q "${pkg_names[@]}" 2>/dev/null || true
+    )
+
+    for line in "${installed_packages[@]}"; do
+        pkg_name="${line%% *}"
+        installed_versions["$pkg_name"]="${line#"$pkg_name "}"
+    done
+
     for pkg_name in "${pkg_names[@]}"; do
-        if ! installed_version="$(pacman -Q "$pkg_name" 2>/dev/null)"; then
+        installed_version="${installed_versions[$pkg_name]-}"
+        if [[ -z "$installed_version" ]]; then
             printf 'not installed: %s\n' "$pkg_name"
             missing=1
             continue
         fi
 
-        installed_version="${installed_version#"$pkg_name "}"
-
         if [[ "$installed_version" != "$expected_version" ]]; then
             printf 'version mismatch: %s %s installed, %s expected\n' \
                 "$pkg_name" "$installed_version" "$expected_version"
@@ -249,7 +260,6 @@ process_package() {
 main() {
     local failures=0
     local dir
-    local found=0
     local package_count=0
 
     parse_args "$@"
@@ -260,7 +270,6 @@ main() {
 
     for dir in "$root"/*; do
         [[ -f "${dir}/PKGBUILD" ]] || continue
-        found=1
         if ((package_count > 0)); then
             printf '\n'
         fi
@@ -271,7 +280,7 @@ main() {
         fi
     done
 
-    ((found)) || die "no PKGBUILD directories found in $root"
+    ((package_count > 0)) || die "no PKGBUILD directories found in $root"
 
     if ((failures)); then
         printf '\n%d package(s) failed\n' "$failures" >&2