Some fish shell configuration changes

terminal/fish/functions/is_ssh_agent_running.fish

@@ -0,0 +1,12 @@
+function is_ssh_agent_running
+  if begin; test -f ~/.ssh/env; and test -z "$SSH_AGENT_PID"; end
+    source ~/.ssh/env > /dev/null
+  end
+
+  if test -z "$SSH_AGENT_PID"
+    return 1
+  end
+
+  ps -ef | grep $SSH_AGENT_PID | grep -v grep | grep -q ssh-agent
+  return $status
+end