fix(waybar): call the bar's installer instead of copying one file

The palette reaches the bar as three generated files, not one: the stylesheet,
dots.colors for the two dot scripts, which are bash and cannot read
@define-color, and two tints of the Slackware mark, which has to contrast with
the accent pill at rest and the dark pill on hover.

Copying only the stylesheet meant a scheme switch recoloured every pill and
left the dots and the mark on the previous scheme. Generating the other two
here would have put a second writer on files the bar's own install.sh already
writes, drifting apart the moment either side was edited. So this calls that
script rather than reimplementing it, with UDT_PALETTE_DONE=1 so it skips the
palette run this one has just done.

Never fatal, like udt-appthemes: a failure there warns and leaves the bar on
its old colours rather than stopping kitty, Kvantum and Sublime from being
themed.

Verified by switching tokyo-night to nord and back with only this script: the
accent, DOT_SUCCESS and both mark tints followed in each direction.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

2 files changed, 34 insertions, 11 deletions

diff --git a/install.sh b/install.sh
index 7bc93c5..3371bba 100755
--- a/install.sh
+++ b/install.sh
@@ -48,18 +48,30 @@ ln -sfn "$repo/bin/udt-palette" "$HOME/bin/udt-palette"
 # with settings that are none of this repo's business.
 scheme="$(sed -n 's/^scheme *= *//p' "$selector")"
 
-# waybar. The bar is waybar-theme-udt, which keeps its own config directory and
-# imports styles/theme.css under a fixed name, so this is a copy to one path
-# with no import to repoint: switching scheme rewrites the file the running bar
-# already reads.
+# waybar. The bar is waybar-theme-udt, a sibling checkout with its own
+# install.sh, and that script is called here rather than having this one copy
+# the stylesheet into place.
+#
+# The reason is that the palette reaches the bar as THREE generated files, not
+# one: styles/theme.css, dots.colors for the two dot scripts, which are bash
+# and cannot read @define-color, and two tints of the Slackware mark, which
+# has to contrast with the accent pill at rest and the dark pill on hover.
+# Copying only the stylesheet left the dots and the mark on the previous
+# scheme's colours after a switch, and a second writer for those files here
+# would drift from the one over there.
+#
+# Called with the palette already generated, and never fatal: a failure in the
+# bar's install must not stop kitty, Kvantum or Sublime from being themed. The
+# same reasoning as udt-appthemes below.
 #
 # The stock ~/.config/waybar/ is deliberately left alone. Nothing launches it
 # any more, and its stylesheets still reference the per-module role names this
 # generator no longer emits, so writing a new theme in there would leave it
 # referencing colours that do not exist rather than simply sitting unused.
-if [ -d "$HOME/.config/waybar-udt" ]; then
-    install -Dm644 "$repo/templates/waybar/theme.css" \
-        "$HOME/.config/waybar-udt/styles/theme.css"
+waybar_repo="$repo/../waybar-theme-udt"
+if [ -x "$waybar_repo/install.sh" ]; then
+    UDT_PALETTE_DONE=1 "$waybar_repo/install.sh" >/dev/null || \
+        echo "waybar: its install.sh failed, bar left on the old colours" >&2
 fi
 
 install -Dm644 "$repo/templates/terminal/kitty-theme.conf" \
diff --git a/templates/waybar/README.md b/templates/waybar/README.md
index 19c220c..a69f228 100644
--- a/templates/waybar/README.md
+++ b/templates/waybar/README.md
@@ -4,10 +4,21 @@ The bar is [waybar-theme-udt](../../../waybar-theme-udt), which lives in its
 own repository and its own config directory, `~/.config/waybar-udt/`. This
 project supplies only its colours.
 
-`theme.css` is generated here and copied there by `install.sh`, under a fixed
-name that the bar's stylesheet imports, so switching scheme rewrites the file
-the running bar already reads. There is no import to repoint and no per-scheme
-filename.
+`theme.css` is generated here, but `install.sh` does not copy it there itself:
+it calls the bar's own `install.sh`, with `UDT_PALETTE_DONE=1` so that script
+skips regenerating the palette it has just been handed.
+
+That is because the palette reaches the bar as **three** generated files, not
+one: `styles/theme.css`, `dots.colors` for the two dot scripts, which are bash
+and cannot read `@define-color`, and two tints of the Slackware mark, which
+has to contrast with the accent pill at rest and the dark pill on hover.
+Copying only the stylesheet recoloured every pill and left the dots and the
+mark on the previous scheme's colours. Generating them here instead would mean
+two writers for the same files, drifting apart the moment either is edited.
+
+The call is never fatal: a failure in the bar's install warns and leaves the
+bar on its old colours rather than stopping kitty, Kvantum and Sublime from
+being themed. Same reasoning as `udt-appthemes`.
 
 ## What the bar asks for