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;;; wttrin.el --- Emacs Frontend for Weather WWeb Service wttr.in -*- lexical-binding: t; -*-
;;
;; Copyright (C) 2024 Craig Jennings
;; Maintainer: Craig Jennings <c@cjennings.net>
;;
;; Original Authors: Carl X. Su <bcbcarl@gmail.com>
;; ono hiroko (kuanyui) <azazabc123@gmail.com>
;; Version: 0.2.1
;; Package-Requires: ((emacs "24.4") (xterm-color "1.0"))
;; Keywords: weather, wttrin
;; URL: https://github.com/cjennings/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 wttrin-default-cities '("Berkeley" "New Orleans" "New York" "London" "Taipei")
"Specify default cities list for quick completion."
:group 'wttrin
:type 'list)
(defcustom wttrin-default-accept-language '("Accept-Language" . "en-US,en;q=0.8,zh-CN;q=0.6,zh;q=0.4")
"Specify default HTTP request Header for Accept-Language."
:group 'wttrin
:type '(list))
(defcustom wttrin-unit-system nil
"Specify units of measurement.
Use 'm' for 'metric', 'u' for 'USCS, or nil for location based units (default)."
:group 'wttrin
:type 'string)
(defun wttrin-additional-url-params ()
"Concatenates extra information into the URL."
(concat "?" wttrin-unit-system))
(defun wttrin-fetch-raw-string (query) "Get the weather information based on your QUERY."
(let ((url-user-agent "curl"))
(add-to-list 'url-request-extra-headers wttrin-default-accept-language)
(with-current-buffer
(url-retrieve-synchronously
(concat "http://wttr.in/" query "?A")
(lambda (status) (switch-to-buffer (current-buffer))))
(decode-coding-string (buffer-string) 'utf-8))))
(defun wttrin-exit ()
"Exit the wttrin buffer."
(interactive)
(quit-window t))
(defun wttrin-query (city-name)
"Query weather of CITY-NAME via wttrin, and display the result in new buffer."
(let ((raw-string (wttrin-fetch-raw-string city-name)))
(if (string-match "ERROR" raw-string)
(message "Cannot retrieve weather data. Perhaps the city name was misspelled?")
(let ((buffer (get-buffer-create (format "*wttr.in - %s*" city-name))))
(switch-to-buffer buffer)
(setq buffer-read-only nil)
(erase-buffer)
(insert (xterm-color-filter raw-string))
(goto-char (point-min))
(re-search-forward "^$")
(delete-region (point-min) (1+ (point)))
(goto-char (point-max))
(insert "\n")
(insert "Press 'g' for another city's weather, 'q' to quit.")
(use-local-map (make-sparse-keymap))
(local-set-key "q" 'wttrin-exit)
(local-set-key "g" 'wttrin)
(setq buffer-read-only t)))))
;;;###autoload
(defun wttrin (city)
"Display weather information for CITY."
(interactive
(list
(completing-read "City Name: " wttrin-default-cities nil nil
(when (= (length wttrin-default-cities) 1)
(car wttrin-default-cities)))))
(wttrin-query city))
(provide 'wttrin)
;;; wttrin.el ends here
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