用Elisp获取雅虎的股票价格？

Question

我想用雅虎从Emacs Lisp程序中获取股票价格.我有两个问题.

1. 我如何制作http GET？
2. 在Elisp中存储数据的最佳方法是什么,以便我可以对数据进行比较？换句话说,我应该使用一个哈希表,几个哈希表或列表来表示从Yahoo返回的数据吗？

这是我想做的基本概要.

;; Call Yahoo to get equity prices
;;
;; Yahoo Input: 
;;   http://download.finance.yahoo.com/d/quotes.csv?s=AAPL+GOOG&f=sb2b3jkm6
;; Yahoo Output:
;;  "AAPL",211.98,211.82,78.20,215.59,+17.90%
;;  "GOOG",602.94,601.69,282.75,629.51,+18.27%
;;
;; Symbol, ask, bid, 52 week low, 52 week high, % change from 200 day mavg
;;
;; Yahoo format described here: http://www.gummy-stuff.org/Yahoo-data.htm

(defun get-price-url (tickers)
"
s = symbol
b2 = ask real-time
b3 = bid real-time
j = 52 week low
k = 52 week high
"

  (concat "http://download.finance.yahoo.com/d/quotes.csv?s="
      (mapconcat 'identity tickers "+") "&f=sb2b3jk"))


(setq lst '("AAPL" "GOOG" "MSFT" "ORCL"))
(setq url (get-price-url lst))

;; Call Yahoo with Url, process results and place in a data structure
;; 

;; Return results sorted by largest change in 200 day mavg, in descending order
;;

Answer 1

这里有一些代码可以帮助您入门; 我将展示如何将URL抓取到缓冲区,解析每一行,然后显示每个项目的股票代码和价格.你可以从那里修改它来做你需要的.

这会将每行库存数据解析为一个列表,并且可以直接使用第一,第二,第三函数或使用第n个函数来获取值.您可以编写函数来获取所需的每个元素,例如get-ticker(quote),它将返回(第一个自动收报机)

我不会想过要使用什么样的数据结构; 什么是最简单的是好的.如果你需要高性能,那么你不应该为此使用emacs lisp.

(defun test()
  (interactive)
  (let ((quotes (get-quotes '("AAPL" "GOOG" "MSFT" "ORCL" "ERTS" "THQI") "sb")))
    (show-quotes quotes)))

(defun show-quotes(quotes)
  (dolist (quote quotes)
    (message (format "%s $%.2f" (first quote) (string-to-number (second quote))))))

(defun get-quotes(tickers field-string)
  "Given a list of ticker names and a string of fields to return as above, this grabs them
from Yahoo, and parses them"
  (let ((results-buffer (get-yahoo-quotes-to-buffer (get-price-url tickers field-string))))
    (switch-to-buffer results-buffer)
    (parse-quote-buffer results-buffer)))

(defun get-price-url (tickers field-string)
  "Set up the get url"
  (concat "http://download.finance.yahoo.com/d/quotes.csv?s=" 
      (mapconcat 'identity tickers "+") 
      "&f=" field-string))

(defun get-yahoo-quotes-to-buffer(url)
  "Retrieve the quotes to a buffer and return it"
  (url-retrieve-synchronously url))

(defun parse-quote-buffer(b)
  "Parse the buffer for quotes"
  (goto-line 1)
  (re-search-forward "^\n")
  (beginning-of-line)
  (let ((res nil))
    (while (> (point-max) (point))
      (setf res (cons  (split-string (thing-at-point 'line) ",") res))
      (forward-line 1))
    (reverse res)))