mate: add update script

pkgs/desktops/mate/update.sh

@@ -0,0 +1,54 @@
+#!/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
+
+mate_version=1.20
+theme_version=3.22
+materepo=https://pub.mate-desktop.org/releases/${mate_version}
+themerepo=https://pub.mate-desktop.org/releases/themes/${theme_version}
+
+version() {
+    (cd "$root" && nix-instantiate --eval --strict -A "$1.version" | tr -d '"')
+}
+
+update_package() {
+    local p=$1
+    echo $p
+
+    local repo
+    if [ "$p" = "mate-themes" ]; then
+        repo=$themerepo
+    else
+        repo=$materepo
+    fi
+  
+    local p_version_old=$(version mate.$p)
+    local p_versions=$(curl -sS ${repo}/ | sed -rne "s/.*\"$p-([0-9]+\\.[0-9]+\\.[0-9]+)\\.tar\\.xz.*/\\1/p")
+    local p_version=$(echo $p_versions | sed -e 's/ /\n/g' | sort -t. -k 1,1n -k 2,2n -k 3,3n | tail -n1)
+  
+    if [[ "$p_version" = "$p_version_old" ]]; then
+        echo "nothing to do, $p $p_version is current"
+        echo
+        return
+    fi
+
+    # Download package and save hash and file path.
+    local url="$repo/$p-${p_version}.tar.xz"
+    mapfile -t prefetch < <(nix-prefetch-url --print-path "$url")
+    local hash=${prefetch[0]}
+    local path=${prefetch[1]}
+    echo "$p: $p_version_old -> $p_version"
+    (cd "$root" && update-source-version mate.$p "$p_version" "$hash")
+    echo
+}
+
+for d in $(ls -A --indicator-style=none); do
+    if [ -d $d ]; then
+        update_package $d
+    fi
+done