diff --git a/bin/tat b/bin/tat
new file mode 100755
index 0000000..e9c8100
--- /dev/null
+++ b/bin/tat
@@ -0,0 +1,22 @@
+#!/bin/sh
+#
+# Attach or create tmux session named the same as current directory.
+
+session_name="$(basename "$PWD" | tr . -)"
+
+session_exists() {
+  tmux list-sessions | sed -E 's/:.*$//' | grep -q "^$session_name$"
+}
+
+not_in_tmux() {
+  [ -z "$TMUX" ]
+}
+
+if not_in_tmux; then
+  tmux new-session -As "$session_name"
+else
+  if ! session_exists; then
+    (TMUX='' tmux new-session -Ad -s "$session_name")
+  fi
+  tmux switch-client -t "$session_name"
+fi
diff --git a/fish/config.fish b/fish/config.fish
index 93bba8b..52091d5 100644
--- a/fish/config.fish
+++ b/fish/config.fish
@@ -7,6 +7,7 @@ set -g -x EDITOR "emacsclient"
 set -g -x ALTERNATE_EDITOR "vim"
 
 # Setup PATH
+ensure_path ~/.dotfiles/bin
 ensure_path ~/bin
 ensure_path ~/.emacs.d/bin