lunar-client-bin: add package (3.7.12-1)

Upstream moved to an "ow" electron-updater channel with a filename
suffix; latest_version checks both channels (vercmp picks the winner) and
refresh_checksums keeps the _appimage filename in sync. Also clean up
downloaded .AppImage files like the other source leftovers.

lunar-client-bin/pkg.sh

@@ -0,0 +1,46 @@
+# lunar-client-bin - Lunar Client (https://lunarclient.com), Minecraft PvP
+# modpack launcher, proprietary Electron AppImage.
+#
+# Upstream hosts versioned AppImages itself, so there is no build_artifact():
+# on a new version pkgver, the artifact filename (_appimage) and the checksum
+# are refreshed. Upstream currently publishes on the "ow" electron-updater
+# channel (latest-ow-linux.yml) with an -ow filename suffix; the old plain
+# channel (latest-linux.yml) went stale but is still checked in case they
+# switch back - whichever carries the higher version wins.
+
+DL_BASE="https://launcherupdates.lunarclientcdn.com"
+
+_channel_version() {
+  curl -sf "$DL_BASE/$1" | grep -Po '^version: \K\S+'
+}
+
+latest_version() {
+  local a b
+  a="$(_channel_version latest-ow-linux.yml | sed 's/-.*//')"
+  b="$(_channel_version latest-linux.yml | sed 's/-.*//')"
+  [[ -n "$a" || -n "$b" ]] || return 1
+  if [[ -n "$a" && -n "$b" ]]; then
+    if [[ "$(vercmp "$a" "$b")" -ge 0 ]]; then echo "$a"; else echo "$b"; fi
+  else
+    echo "${a:-$b}"
+  fi
+}
+
+# refresh_checksums <version> <pkgbuild-path>
+refresh_checksums() {
+  local ver="$1" pkgbuild="$2"
+  local yml file sha
+  for yml in latest-ow-linux.yml latest-linux.yml; do
+    file="$(curl -sf "$DL_BASE/$yml" | grep -Po '^path: \K.*\.AppImage')"
+    [[ "$file" == *"$ver"* ]] && break
+    file=""
+  done
+  [[ -n "$file" ]] || { echo "no updater channel carries version $ver" >&2; return 1; }
+  file="${file// /%20}"
+
+  sha="$(curl -sfL "$DL_BASE/$file" | sha256sum | cut -d' ' -f1)"
+  sed -i \
+    -e "s|^_appimage=.*|_appimage=\"$file\"|" \
+    -e "s|^sha256sums=.*|sha256sums=('$sha')|" \
+    "$pkgbuild"
+}