feat(tmux): add tmx function for attaching or creating a tmux session (#53)

Reviewed-on: https://codeberg.org/vlw/dotfiles/pulls/53

.bash_aliases

@@ -5,10 +5,6 @@ alias phpa="sudo update-alternatives --config php"
 # Kill all code-server processes. Sometimes it hangs on startup
 alias kvscode="ps uxa | grep .vscode-server | awk '{print $2}' | xargs kill -9"
 
-# Tmux split commands, "q" for fast access, "w" for horizontal (right of q), "a" for vertical (below q) 
-alias qw="tmux split-window -h"
-alias qa="tmux split-window -v"
-
 # +-------------------+
 # | Directory & Files |
 # +-------------------+
@@ -197,3 +193,23 @@ sshl () {
 
     ssh -p 2222 "$user"@local.vlw.se
 }
+
+# +------+
+# | Tmux |
+# +------+
+
+# Tmux split commands, "q" for fast access, "w" for horizontal (right of q), "a" for vertical (below q) 
+alias qw="tmux split-window -h"
+alias qa="tmux split-window -v"
+
+tmx() {
+    # Check if any tmux sessions exist
+    if tmux has-session 2>/dev/null; then
+        # Attach to the first existing session
+        tmux attach-session -d -t $(tmux ls | head -n 1 | awk '{print $1}' | tr -d :)
+
+        return 0
+    fi
+
+    tmux new-session -s default
+}