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;;; wttrin.el --- Emacs frontend for weather web service wttr.in
;; Copyright (C) 2016 Carl X. Su
;; Author: Carl X. Su <bcbcarl@gmail.com>
;; Version: 0.1.0
;; Package-Requires: ((emacs "24.4") (xterm-color "20150823.646"))
;; Keywords: comm, weather, wttrin
;; URL: https://github.com/bcbcarl/emacs-wttrin
;;; Commentary:
;; Provides the weather information from wttr.in based on your query condition.
;;; Code:
(require 'url)
(require 'xterm-color)
(defgroup wttrin nil
"Emacs frontend for weather web service wttr.in."
:prefix "wttrin-"
:group 'comm)
(defcustom wttring-default-city "Taipei"
"Specify a defauly city to get the weather information."
:group 'wttrin
:type 'string)
(defun wttrin-fetch-raw-string (query)
"Get the weather information based on your QUERY."
(let ((url-request-extra-headers '(("User-Agent" . "curl"))))
(with-current-buffer
(url-retrieve-synchronously
(concat "http://wttr.in/" query)
(lambda (status) (switch-to-buffer (current-buffer))))
(decode-coding-string (buffer-string) 'utf-8))))
(defun wttrin-query (city-name)
"Query weather of CITY-NAME via wttrin, and display the result
in another buffer."
(let ((raw-string (wttrin-fetch-raw-string city-name)))
(if (string-match "ERROR" raw-string)
(message "Cannot get weather data. Maybe you inputed a wrong city name?")
(let ((buffer (get-buffer-create (format "*wttr.in - %s*" city-name))))
(switch-to-buffer buffer)
(insert (xterm-color-filter raw-string))
(goto-char (point-min))
(re-search-forward "^$")
(delete-region (point-min) (1+ (point)))
(setq buffer-read-only t)))))
(defun wttrin (&optional force-ask)
"Display weather information.
Add C-u prefix to force to ask city name."
(interactive)
(let* ((ask? (or current-prefix-arg force-ask))
(city-name (if ask?
(read-from-minibuffer "City name: ")
(or wttring-default-city (read-from-minibuffer "City name: ")))))
(wttrin-query city-name)))
(provide 'wttrin)
;;; wttrin.el ends here
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