Fix foot open in same dir

home/niri/default.nix

@@ -3,12 +3,21 @@
   scale ? null,
   ...
 }: let
-  terminal = "${pkgs.foot}/bin/footclient";
   nautilus = "${pkgs.nautilus}/bin/nautilus";
   playerctl = "${pkgs.playerctl}/bin/playerctl";
   wpctl = "${pkgs.wireplumber}/bin/wpctl";
   brightnessctl = "${pkgs.brightnessctl}/bin/brightnessctl";
-  terminal-name = "foot";
+  # Spawn a foot terminal that the "duplicate window" keybind can later trace back to
+  # its shell. foot's --server mode makes every window report the *server's* PID to the
+  # compositor, so niri can't distinguish windows by PID. Instead we give each window a
+  # unique app-id ("footclient-<pid>") and export the same value as FOOT_APPID into its
+  # shell; -E hands footclient's environment (incl. FOOT_APPID) to the server-spawned
+  # shell. launch_terminal then finds the focused window's shell by matching FOOT_APPID.
+  spawn_terminal = pkgs.writeShellScriptBin "spawn_terminal" ''
+    ID="footclient-$$"
+    export FOOT_APPID="$ID"
+    exec ${pkgs.foot}/bin/footclient -E --app-id="$ID" "$@"
+  '';
   launch_terminal = pkgs.writeShellScriptBin "launch_terminal" ''
     function find_leaf_pid(){
         local PID
@@ -29,28 +38,46 @@
         fi
     }
 
-    LEAF_PID=$(find_leaf_pid "$1")
+    # foot runs in --server mode, so niri reports the shared server PID for every foot
+    # window and cannot tell them apart. Resolve the focused window to its own shell by
+    # matching the FOOT_APPID marker that spawn_terminal exports into each window: scan
+    # the server's direct children for the one whose environment carries our app-id.
+    FOCUSED=$(niri msg --json focused-window)
+    SERVER_PID=$(echo "$FOCUSED" | ${pkgs.jq}/bin/jq -r '.pid // empty')
+    APP_ID=$(echo "$FOCUSED" | ${pkgs.jq}/bin/jq -r '.app_id // empty')
+
+    ROOT_PID=""
+    if [ -n "$APP_ID" ] && [ -n "$SERVER_PID" ]; then
+        for CHILD in $(pgrep -P "$SERVER_PID"); do
+            if grep -qzF "FOOT_APPID=$APP_ID" "/proc/$CHILD/environ" 2>/dev/null; then
+                ROOT_PID="$CHILD"
+                break
+            fi
+        done
+    fi
+
+    # Focused window isn't one of our tagged foot terminals: just open a plain terminal.
+    if [ -z "$ROOT_PID" ]; then
+        exec ${spawn_terminal}/bin/spawn_terminal
+    fi
+
+    LEAF_PID=$(find_leaf_pid "$ROOT_PID")
     if [ "$(ps -p "$LEAF_PID" -o comm=)" == "ssh" ]; then
         SSH_COMMAND=$(ps -p "$LEAF_PID" -o args --no-headers)
         if [[ "$SSH_COMMAND" == *"waypipe"* ]]; then
             CLIENT=$(echo "$SSH_COMMAND" | awk '{ print $5 }')
             PREVIOUS_SESSION_ID=$(grep -z "SSH_SESSION_ID" "/proc/$LEAF_PID/environ" | xargs -0 -n 1 | grep -oP "[0-9]*")
             SSH_SESSION_ID=$RANDOM
-            ${terminal} -e zsh -c "SSH_SESSION_ID=$SSH_SESSION_ID waypipe ssh -t \"$CLIENT\" env SSH_SESSION_ID=\"$SSH_SESSION_ID\" PREVIOUS_SESSION_ID=\"$PREVIOUS_SESSION_ID\" \"zsh --login\""
+            ${spawn_terminal}/bin/spawn_terminal zsh -c "SSH_SESSION_ID=$SSH_SESSION_ID waypipe ssh -t \"$CLIENT\" env SSH_SESSION_ID=\"$SSH_SESSION_ID\" PREVIOUS_SESSION_ID=\"$PREVIOUS_SESSION_ID\" \"zsh --login\""
         else
-            ${terminal} -e zsh -c "ssh -t \"$(echo "$SSH_COMMAND" | awk '{ print $2 }')\""
+            ${spawn_terminal}/bin/spawn_terminal zsh -c "ssh -t \"$(echo "$SSH_COMMAND" | awk '{ print $2 }')\""
         fi
-
+    else # Not an ssh session: open a local terminal in the same directory.
-    else # Not an ssh session
+        CWD=$(readlink -e /proc/"$LEAF_PID"/cwd)
-        if [ "$(ps -p "$1" -o comm=)" == "${terminal-name}" ]; then
+        if [ "$CWD" != "" ]; then
-            CWD=$(readlink -e /proc/"$LEAF_PID"/cwd)
+            ${spawn_terminal}/bin/spawn_terminal --working-directory "$CWD"
-            if [ "$CWD" != "" ]; then
-                ${terminal} --working-directory "$CWD"
-            else
-                ${terminal}
-            fi
         else
-            ${terminal}
+            ${spawn_terminal}/bin/spawn_terminal
         fi
     fi
   '';
@@ -156,8 +183,8 @@ in {
 
         binds {
             // General Binds
-                Mod+Return { spawn "sh" "-c" "${launch_terminal}/bin/launch_terminal $(niri msg --json focused-window | ${pkgs.jq}/bin/jq .pid)"; }
+                Mod+Return { spawn "${launch_terminal}/bin/launch_terminal"; }
-            Mod+Shift+Return { spawn "${terminal}"; }
+            Mod+Shift+Return { spawn "${spawn_terminal}/bin/spawn_terminal"; }
             Mod+Q { close-window; }
             Mod+A { spawn "${nautilus}"; }
             Mod+B { spawn "Helium"; }