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- (in-package #:chatikbot)
- (defparameter +yahoo-url+ "https://query.yahooapis.com/v1/public/yql" "Yahoo Finance API endpoint")
- (defparameter +yahoo-query+ "select Name,Rate from yahoo.finance.xchange where pair in (~{\"~A\"~^,~})")
- (defvar *rate-pairs* '("USDRUB" "EURRUB" "GBPRUB"))
- (defun get-rates (&optional (pairs *rate-pairs*))
- (let ((response (yason:parse
- (flexi-streams:octets-to-string
- (drakma:http-request +yahoo-url+
- :parameters (append '(("format" . "json")
- ("env" . "store://datatables.org/alltableswithkeys"))
- (list (cons "q" (format nil +yahoo-query+ pairs)))))
- :external-format :utf-8)
- :object-as :alist)))
- (when (aget "error" response)
- (error "Error in rates request"))
- (loop for rate in (aget "rate" (aget "results" (aget "query" response)))
- collect (cons (aget "Name" rate)
- (read-from-string (aget "Rate" rate))))))
- (defun get-serie (series name)
- (loop for (time . rates) in series
- when (aget name rates)
- collect (list time (aget name rates))))
- (defun make-chart (series &key (usd t) (eur t) (gbp t))
- (let ((flat (remove-if #'null (if (alexandria:circular-list-p series)
- (flat-circular series)
- series))))
- (adw-charting:with-line-chart (1200 900)
- (when usd (adw-charting:add-series "USD/RUB" (get-serie flat "USD/RUB")))
- (when eur (adw-charting:add-series "EUR/RUB" (get-serie flat "EUR/RUB")))
- (when gbp (adw-charting:add-series "GBP/RUB" (get-serie flat "GBP/RUB")))
- (adw-charting:set-axis
- :x "Time" :draw-gridlines-p t
- :label-formatter #'(lambda (v) (local-time:format-timestring nil (local-time:unix-to-timestamp v)
- :format '((:hour 2) ":" (:min 2)))))
- (adw-charting:set-axis :y "RUB" :draw-gridlines-p t :label-formatter "~,2F")
- (adw-charting:save-file "chart.png"))))
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