Add xonsh update script

.scripts/update.xsh

@@ -0,0 +1,49 @@
+#!/usr/bin/env xonsh
+
+import re
+
+def get_out(out_obj):
+    for line in out_obj:
+        print(line, end="")
+
+    return out_obj.out.split("\n")
+
+def press_to_exit():
+    read -s -n 1 -p "Exit"
+
+def main():
+    if $ARG1 == "rpm-ostree":
+        out = get_out(!(rpm-ostree upgrade | tee))
+
+        if out[-2] != "No upgrade available.":
+            press_to_exit()
+    elif $ARG1 == "flatpak":
+        flatpak update -y
+        flatpak remove --delete-data --unused
+    elif $ARG1 == "pipx":
+        out = get_out(!(pipx upgrade-all --include-injected | tee))
+        
+        if "did not change" not in out[-2]:
+            press_to_exit()
+    elif $ARG1 == "cargo":
+        out = get_out(!(cargo install-update -a | tee))
+
+        pattern = r"updated (\d+) packages"
+        match = re.search(pattern, out[-2])
+
+        if match is None:
+            press_to_exit()
+            return
+
+        num_updated_packages = match.group(1)
+
+        if num_updated_packages != "0":
+            press_to_exit()
+    elif $ARG1 == "npm":
+        npm update -g
+    elif $ARG1 == "nvim":
+        nvim --headless -c "autocmd User PackerComplete quitall" -c "PackerSync"
+    else:
+        print(f"{$ARG1} not found!")
+
+main()