feat(steps): hand pending root steps to a quickshell window

Notification balloons carried the GRUB and homepage root commands, but a
balloon cannot stay open while its commands are pasted into a root shell.
bin/udt-steps NAME writes a consumer's pending steps to
~/.cache/udt/steps/NAME and pokes quickshell's appearance shell, which shows
one tab per file on DP-3. Empty stdin clears the tab, so producers report
on every run and a consumer that caught up drops out by itself.

udt-grub and udt-homepage now route through it. install.sh's SDDM block
checks what is installed and reports only the steps still missing, rather
than printing the full install on every run. udt-homepage remembers the
last staged pair, since udt-accent now also runs on icon switches, which
change neither file and would re-raise the finish steps for nothing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 20 insertions, 9 deletions

diff --git a/install.sh b/install.sh
index 33e6f0c..ff08dba 100755
--- a/install.sh
+++ b/install.sh
@@ -104,7 +104,7 @@ ln -sfn "$HOME/.cache/udt/colors.json" "$HOME/.cache/wal/colors.json"
 
 # The rofi menus are bound by name in hypr-theme's keybindings, so they keep
 # the names they had when they lived loose in ~/bin.
-for f in udt-accent udt-grub udt-palette udt-machine-name udt-powermenu.sh udt-launcher.sh qar-scrotmenu.sh; do
+for f in udt-accent udt-grub udt-steps udt-palette udt-machine-name udt-powermenu.sh udt-launcher.sh qar-scrotmenu.sh; do
     ln -sfn "$repo/bin/$f" "$HOME/bin/$f"
 done
 
@@ -327,16 +327,27 @@ if pgrep -x conky >/dev/null 2>&1; then
 fi
 
 # SDDM. The theme code is root-installed, but the palette the greeter reads has
-# to stay live, so the root block below symlinks the generated file in. Printed,
-# never run: /usr/share/sddm is root-owned and this script is not.
-sddm_repo="$repo/../sddm-theme-udt"
+# to stay live, so the root block below symlinks the generated file in. Never
+# run here: /usr/share/sddm is root-owned and this script is not. Only the
+# steps still needed are printed and handed to the steps window; none clears
+# its tab.
+sddm_repo="$(realpath -m "$repo/../sddm-theme-udt")"
 if [ -d "$sddm_repo/theme" ]; then
+    sddm=/usr/share/sddm/themes/udt
+    sddm_conf="$HOME/.local/share/udt/sddm-theme.conf"
+    sddm_steps="$(
+        diff -rq -x theme.conf.user "$sddm_repo/theme" "$sddm" >/dev/null 2>&1 ||
+            printf '  install -d %s\n  cp -r "%s/theme/." %s/\n' "$sddm" "$sddm_repo" "$sddm"
+        [ "$(readlink "$sddm/theme.conf.user")" = "$sddm_conf" ] ||
+            printf '  ln -sfn "%s" %s/theme.conf.user\n' "$sddm_conf" "$sddm"
+        grep -qx 'Current=udt' /etc/sddm.conf.d/udt.conf 2>/dev/null ||
+            printf "  printf '[Theme]\\\\nCurrent=udt\\\\n' > /etc/sddm.conf.d/udt.conf\n"
+    )"
+    [ -n "$sddm_steps" ] && sddm_steps="The SDDM theme is out of date. As root:
+$sddm_steps"
     echo
-    echo "sddm theme: run these as root to install or refresh it"
-    echo "  install -d /usr/share/sddm/themes/udt"
-    echo "  cp -r \"$sddm_repo/theme/.\" /usr/share/sddm/themes/udt/"
-    echo "  ln -sfn \"$HOME/.local/share/udt/sddm-theme.conf\" /usr/share/sddm/themes/udt/theme.conf.user"
-    echo "  printf '[Theme]\\nCurrent=udt\\n' > /etc/sddm.conf.d/udt.conf"
+    echo "sddm theme: ${sddm_steps:-up to date}"
+    printf '%s' "$sddm_steps" | "$repo/bin/udt-steps" sddm
 fi
 
 # GRUB. Same shape as SDDM: udt-palette has rendered theme.txt, and udt-grub