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;;; bom.el -- Australian weather forecast from the Bureau -*- lexical-binding: t -*-
;; Copyright (C) 2023 Free Software Foundation, Inc.
;; Author: Yuchen Pei <id@ypei.org>
;; Package-Requires: ((emacs "28.2") (web-server "0.0.2"))
;; This file is part of bom.el.
;; bom.el is free software: you can redistribute it and/or modify it
;; under the terms of the GNU Affero General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.
;; bom.el is distributed in the hope that it will be useful, but WITHOUT
;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
;; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General
;; Public License for more details.
;; You should have received a copy of the GNU Affero General Public
;; License along with bom.el. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Australian weather forecast from the Bureau. A client that
;; downloads weather forecast and serves them using emacs-web-server.
;;; Code:
(require 'hierarchy)
(require 'web-server)
(defvar bom-state-files
'((act . "IDN11060")
(nsw . "IDN11060")
(nt . "IDD10207")
(qld . "IDQ11295")
(sa . "IDS10044")
(tas . "IDT16710")
(vic . "IDV10753")
(wa . "IDW14199"))
"Alist of states and territories and their corresponding filenames on the BOM FTP server, see <http://www.bom.gov.au/catalogue/data-feeds.shtml>.")
(defun bom-api (state)
"Get weather forecast data of STATE from the BOM FTP."
(if-let ((filename (alist-get (intern (downcase state)) bom-state-files)))
(with-current-buffer
(find-file-noselect
(format "/ftp:anonymous@ftp.bom.gov.au:/anon/gen/fwo/%s.xml" filename))
(libxml-parse-xml-region (point-min) (point-max)))
(user-error "State %s not found" state)))
(defun bom-get-areas (resp)
"Given an API response RESP, get all areas."
(dom-children (dom-by-tag resp 'forecast)))
(defvar bom-areas nil "List of areas with forecasts.")
(defvar bom-server nil "The BOM server object.")
(defun bom-area-parent (area)
"Search `bom-areas' for the parent of AREA.
Used as parentfn for hierarchy."
(let ((parent-aac (dom-attr area 'parent-aac)))
(cl-find-if
(lambda (area)
(equal (dom-attr area 'aac) parent-aac))
bom-areas)))
(defun bom-hyphenate-downcase (name)
"Downcase NAME and replace all space with hyphens."
(replace-regexp-in-string " " "-" (downcase name)))
(defun bom-format-area (area level)
"Format an AREA of LEVEL."
(format "%s %s
:PROPERTIES:
:CUSTOM_ID: %s
:END:
%s
"
(make-string level ?*)
(dom-attr area 'description)
(bom-hyphenate-downcase (dom-attr area 'description))
(if (dom-children area)
(concat "\n" (bom-format-forecasts (dom-children area)))
"")))
(defun bom-area-lessp (a1 a2)
"Compare two areas A1 and A2 based on their AAC identifier."
(string-lessp (dom-attr a1 'aac) (dom-attr a2 'aac)))
(defun bom-format-forecasts (forecasts)
"Format a list of FORECASTS."
(mapconcat 'bom-format-forecast forecasts "\n"))
(defun bom-format-forecast (forecast)
"Format a FORECAST period."
(let ((date (substring (dom-attr forecast 'start-time-local) 5 10))
(data (dom-children forecast))
(min-temp) (max-temp) (precis) (prec-prob))
(dolist (item data)
(pcase (dom-attr item 'type)
("air_temperature_minimum" (setq min-temp (dom-text item)))
("air_temperature_maximum" (setq max-temp (dom-text item)))
("probability_of_precipitation" (setq prec-prob (dom-text item)))
("precis" (setq precis (dom-text item)))))
(format "- %s :: %s %s %s"
date prec-prob precis (bom-format-temp-range min-temp max-temp))))
(defun bom-format-temp-range (min-temp max-temp)
"Format a temperature range from MIN-TEMP to MAX-TEMP."
(if (or min-temp max-temp)
(format "%s - %s"
(if min-temp (concat min-temp "C") "")
(if max-temp (concat max-temp "C") ""))
""))
(defun bom-format-areas-org (areas)
"Format hierarchy of AREAS with forecasts.
We use the description of the first root as the state name."
(let ((state-name (dom-attr (car (hierarchy-roots areas)) 'description)))
(format "#+title: %s weather forecast\n\n%s"
state-name
(string-join
(hierarchy-map 'bom-format-area areas 1)
"\n"))))
(defun bom-org-to-html (s)
"Export org string S to html and return the html string."
(with-temp-buffer
(insert s)
(let ((org-html-postamble))
(org-export-as 'html))))
(defun bom-format-areas-html (areas)
"Format hierarchy of AREAS with forecasts to html."
(bom-org-to-html (bom-format-areas-org areas)))
(defun bom-get-forecasts (state)
"Call BOM API and return hierarchy of STATE areas with forecasts."
(let ((areas (hierarchy-new)))
(hierarchy-add-trees
areas
(setq bom-areas (bom-get-areas (bom-api state)))
'bom-area-parent)
(hierarchy-sort areas 'bom-area-lessp)
areas))
(defun bom-format-state-lists-org ()
(format
"#+title: Australia weather forecast\n%s"
(mapconcat
(lambda (pair) (format "[[file:%s][%s]]"
(car pair)
(upcase (format "%s" (car pair)))))
bom-state-files
" ")))
(defun bom-format-state-lists-html ()
(bom-org-to-html (bom-format-state-lists-org)))
(defun bom-format-state-lists-html ())
(defun bom-serve (path)
"Serve based on PATH."
(setq path (substring path 1))
(if (string-empty-p path)
(bom-format-state-lists-html)
(bom-format-areas-html
(bom-get-forecasts path))))
;;;###autoload
(defun bom-start ()
"Start serving weather forecasts."
(when bom-server (bom-stop))
(setq bom-server
(ws-start
(lambda (request)
(with-slots (process headers) request
(ws-response-header process 200 '("Content-type" . "text/html"))
(process-send-string
process
(bom-serve (alist-get :GET headers))
)))
9000)))
(defun bom-stop ()
"Stop serving weather forecasts."
(ws-stop bom-server))
(provide 'bom)
;;; bom.el ends here
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