[feat] Update flake.lock and add start-tmux script

config/nix/scripts/start-tmux.nix

@@ -0,0 +1,48 @@
+{
+  pkgs,
+  ...
+}:
+pkgs.writeShellScript "start-tmux" ''
+    live_sessions=$(${pkgs.tmux}/bin/tmux list-sessions 2>/dev/null)
+    all_sessions=$(${pkgs.findutils}/bin/find -L ~/.config/tmux/sessions -type f -executable  -printf '%f\n'| sort)
+    TMUX_SESSIONS="$HOME/.config/tmux/sessions"
+    # for some reason ~/.config/tmux/session doesn't work if made with quotes
+    # TMUX_SESSIONS=$XDG_CONFIG_HOME/tmux/sessions
+    if ! [ -z "$TMUX" ];then
+    echo "Nested tmux sessions are a bad idea?"
+    echo "If you want to really do this unset TMUX environment variable"
+    exit 1
+    fi
+    IFS=$'\n'
+    for live_session in $live_sessions;do
+        live_session_name=$(echo $live_session | ${pkgs.coreutils}/bin/cut -d: -f1)
+        if [ -z "''\${all_sessions##*$live_session_name*}" ];then # see https://stackoverflow.com/questions/229551/how-to-check-if-a-string-contains-a-substring-in-bash
+            all_sessions="$(echo "$all_sessions" | sed "s/$live_session_name/$live_session/g")"
+        else
+            all_sessions=$(echo -e "$all_sessions\n$live_session")
+    # Okay I know this is ugly it is 5:13 my brain is not working
+        fi
+    session=$(echo "''\$all_sessions" | fzf)
+    session_name=$(echo $session | cut -d: -f1)
+    if [ -z "$session" ];then
+        exit 0
+    fi
+    if ! [ -z "''\${session##*created*}" ];then
+        if [ -x "$TMUX_SESSIONS/$session_name" ];then
+            source $TMUX_SESSIONS/$session_name
+        else
+            echo $TMUX_SESSIONS/$session_name not found or is not executable
+            exit 1
+        fi
+    fi
+    if [ -z "''\${session##*attached*}" ];then
+        read -r -p "The session is already attached somewhere else. Attach it here too ? (y/N): " choice
+        if [ "$choice" == "y" ] || [ "$choice" == "Y" ];then
+            tmux attach-session -t$session_name
+        fi
+    else
+        tmux attach-session -t$session_name
+    fi
+    done
+''
+