Let Neovim's current line and status line show the terminal background on existing installs (#15024)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

migrations/1791723398.sh

@@ -0,0 +1,55 @@
+echo "Let Neovim's current line and status line show the terminal background"
+
+# ~/.config/nvim is copied once from omarchy-nvim, so it misses the package's
+# later changes. Bring in the transparency file and lualine spec it now ships.
+config="$HOME/.config/nvim"
+package="/usr/share/omarchy-nvim/config"
+files=(plugin/after/transparency.lua lua/plugins/lualine-transparent.lua)
+
+[[ -d $config ]] || exit 0
+
+# Dotfile managers may own a file or a parent directory through a symlink.
+# Preserve that layout rather than detaching or editing its target.
+for file in "${files[@]}"; do
+  path="$config/$file"
+  while [[ $path != "$HOME" && $path != / ]]; do
+    if [[ -L $path ]]; then
+      echo "Preserving symlink-managed Neovim config: $path"
+      exit 0
+    fi
+    path=$(dirname "$path")
+  done
+done
+
+# Updates install packages before migrations. An older package leaves this
+# pending rather than copying files it does not have yet.
+if [[ ! -f $package/${files[1]} ]]; then
+  echo "Update omarchy-nvim to 2026.9.21-5 or newer before rerunning this migration." >&2
+  exit 1
+fi
+
+# A copy staged beside its target and moved into place whole, so a failed
+# write leaves the original for a retry.
+staged=""
+trap 'rm -f -- ${staged:+"$staged"}' EXIT
+install_from_package() {
+  staged=$(mktemp "$config/$1.new.XXXXXX")
+  install -m 0644 "$package/$1" "$staged"
+  mv -fT -- "$staged" "$config/$1"
+}
+
+# Only a transparency file still as Omarchy shipped it is replaced, so one the
+# user changed is kept.
+if [[ -f $config/${files[0]} ]]; then
+  case $(sha256sum <"$config/${files[0]}") in
+    bd833dc094e3546b5fad512e61cfb09f3032c2a4461c23be7bd90851de80688e* | \
+      6e31b917f13e16514ac94ff9270d47f24e76509a3e559ca85116a5aa2d61306a* | \
+      33d29360df84ed48c70606580749536520384ec64afe650151d4e26e7922b410*)
+      install_from_package "${files[0]}"
+      ;;
+  esac
+fi
+
+if [[ -d $config/lua/plugins && ! -e $config/${files[1]} ]]; then
+  install_from_package "${files[1]}"
+fi