lxqt: add update script

pkgs/desktops/lxqt/update.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p libarchive curl common-updater-scripts
+
+set -eu -o pipefail
+
+cd "$(dirname "${BASH_SOURCE[0]}")"
+root=../../..
+export NIXPKGS_ALLOW_UNFREE=1
+
+lxqt_version=0.13.0
+lxqtrepo=https://downloads.lxqt.org/${lxqt_version}.html
+
+version() {
+    (cd "$root" && nix-instantiate --eval --strict -A "$1.version" 2>/dev/null | tr -d '"')
+}
+
+update_lxqt() {
+    local pname
+    local pversion
+    curl -sS ${lxqtrepo} | sed -rne 's|.*<a href=.*>(.+) (.+)</a><br>|\1 \2|p' |
+        while read pname pversion; do
+            local pversionold=$(version lxqt.$pname)
+            if [[ "$pversion" = "$pversionold" ]]; then
+                echo "nothing to do, $pname $pversion is current"
+            else
+                echo "$pname: $pversionold -> $pversion"
+                (cd "$root"
+                 local pfile=$(EDITOR=echo nix edit -f. lxqt.$pname 2>/dev/null)
+                 update-source-version lxqt.$pname "$pversion"
+                 git add $pfile
+                 git commit -m "$pname: $pversionold -> $pversion"
+                )
+            fi
+            echo
+        done
+    echo DONE
+}
+
+update_lxqt