Added nvim / ghostty / starship config

Signed-off-by: Rack Lin <racklin@gmail.com>

fish/functions/__ssh_agent_is_started.fish

@@ -0,0 +1,14 @@
+function __ssh_agent_is_started -d "check if ssh agent is already started"
+	if begin; test -f $SSH_ENV; and test -z "$SSH_AGENT_PID"; end
+		source $SSH_ENV > /dev/null
+	end
+
+	if begin; test -z "$SSH_AGENT_PID"; and test -z "$SSH_CONNECTION"; end
+		return 1
+	end
+
+	ssh-add -l > /dev/null 2>&1
+	if test $status -eq 2
+		return 1
+	end
+end