First chunk of major refactor. Move code to external files located in .includes. Better code organization and easier to deal with.

.includes/update.sh

@@ -0,0 +1,52 @@
+# Check for latest news
+check_news() {
+    # For use by update scripts that want to source functions in this file.
+    [[ "$agmNoLaunch" == "true" ]] && return
+    trap return INT
+    # url for news file
+    local newsFile="https://stormgames.wolfe.casa/media/agm.ogg"
+    local newsPath="${configFile%/*.conf}/.news"
+    local newsTag="$(curl --connect-timeout 5 -sI "$newsFile" | grep -i '^etag: "' | cut -d '"' -f2)"
+    if [[ -z "${newsTag}" ]]; then
+        return
+    fi
+    local newsOldTag="$(cat "$newsPath" 2> /dev/null)"
+    if [[ "$newsTag" != "$newsOldTag" ]]; then
+        dialog --yes-label 'Play' \
+            --no-label 'Later' \
+            --backtitle 'Audiogame Manager News' \
+            --yesno 'Audiogame manager news is available. Please use left and right arrows to navigate and enter to confirm.' -1 -1 || return
+        sox -qV0 "$newsFile" -d  &> /dev/null
+        echo -n "$newsTag" > "$newsPath"
+    fi
+}
+
+# Automatic update function
+# Automatic update function
+update() {
+    if ! [[ -d ".git" ]]; then
+        return
+    fi
+    local url="$(git ls-remote --get-url)"
+    if [[ "$url" =~ ^ssh://|git@|gitea@ ]] || [[ -z "$url" ]]; then
+        return
+    fi
+    git remote update &> /dev/null
+    local upstream='@{u}'
+    local home="$(git rev-parse @)"
+    local remote="$(git rev-parse "$upstream")"
+if [[ "$home" == "$remote" ]]; then
+    return
+fi
+    dialog --backtitle "Audiogame Manager" \
+        --yesno "Updates are available. Would you like to update now?" -1 -1 --stdout || return
+    { git pull
+    git log '@{1}..' --pretty=format:'%an: %s' | tac; }
+    exit $?
+}
+# Get latest news if available
+check_news
+# With no arguments, open the game launcher.
+if [[ $# -eq 0 ]]; then
+    game_launcher
+fi