从Emacs缓冲区中提取URL？

Question

从Emacs缓冲区中提取URL？

如何编写Emacs Lisp函数来查找HTML文件中的所有href并提取所有链接？

输入:

<html>
 <a href="http://www.stackoverflow.com" _target="_blank">StackOverFlow</a>
 <h1>Emacs Lisp</h1>
 <a href="http://news.ycombinator.com" _target="_blank">Hacker News</a>
</html>

输出:

http://www.stackoverflow.com|StackOverFlow
http://news.ycombinator.com|Hacker News

我在搜索过程中看到了多次提到的重新搜索转发功能.根据我到目前为止所读到的内容,我认为这是我需要做的.

(defun extra-urls (file)
 ...
 (setq buffer (...
 (while
        (re-search-forward "http://" nil t)
        (when (match-string 0)
...
))

Answer 1

小智 5

我采用了Heinzi的解决方案,并提出了我需要的最终解决方案.我现在可以获取文件列表,提取所有URL和标题,并将结果放在一个输出缓冲区中.

(defun extract-urls (fname)
 "Extract HTML href url's,titles to buffer 'new-urls.csv' in | separated format."
  (setq in-buf (set-buffer (find-file fname))); Save for clean up
  (beginning-of-buffer); Need to do this in case the buffer is already open
  (setq u1 '())
  (while
      (re-search-forward "^.*<a href=\"\\([^\"]+\\)\"[^>]+>\\([^<]+\\)</a>" nil t)

      (when (match-string 0)            ; Got a match
        (setq url (match-string 1) )    ; URL
        (setq title (match-string 2) )  ; Title
        (setq u1 (cons (concat url "|" title "\n") u1)) ; Build the list of URLs
       )
      )
  (kill-buffer in-buf)          ; Don't leave a mess of buffers
  (progn
    (with-current-buffer (get-buffer-create "new-urls.csv"); Send results to new buffer
      (mapcar 'insert u1))
    (switch-to-buffer "new-urls.csv"); Finally, show the new buffer
    )
  )

;; Create a list of files to process
;;
(mapcar 'extract-urls '(
                       "/tmp/foo.html"
                       "/tmp/bar.html"
               ))

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