如,修改Emacs-W3M的默认Search为DuckDuck Go ==> http://www.duckduckgo.com/?q=%s
(setq w3m-search-default-engine "DuckDuck Go")
(add-to-list 'w3m-search-engine-alist
'("DuckDuck Go" "http://www.duckduckgo.com/?q=%s"))
(defadvice w3m-search (after change-default activate)
(let ((engine (nth 1 minibuffer-history)))
(when (assoc engine w3m-search-engine-alist)
(setq w3m-search-default-engine engine))))
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