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#!/usr/bin/env gosh
(use gauche.process)
(use srfi-13)
(use srfi-19)
(use file.util)
(define url "https://ilztalbahn.eu/wp-content/uploads/2020/07/gtfs.zip")
(define cachefile "/tmp/urlwatch-cache")
(define storagedir "/var/lib/urlwatch-ilztal")
(do-process `(mkdir "-p" ,storagedir))
(define (get-hash url)
(string-trim-both
(process-output->string `((curl ,url)
(sha256sum)))))
(define hash
(get-hash url))
(define pretty-date
(date->string (time-utc->date (current-time)) "~5"))
(define (hash-did-change oldhash newhash)
(print (format "the url's hash has changed to ~s!" newhash))
(let ([newfile (string-append storagedir "/" newhash)])
(do-process `(curl ,url "-o" ,newfile))
(let ([diff (if oldhash
(let ([oldfile (string-append storagedir "/" oldhash)])
(process-output->string `(zipcmp ,oldfile ,newfile)))
"")])
(do-pipeline `((echo ,(format "
From: urlwatcher@flora.stuebinm.eu
Subject: Ilztalbahn GTFS Update
Neuer hash: ~a
Link: ~a
~a
(~a)
" newhash url diff pretty-date))
(sendmail "stuebinm@disroot.org")))
(sexp-list->file
cachefile
(list (list pretty-date newhash))
:if-exists :append))))
(if (file-is-writable? cachefile)
(let ([oldhash (cadr (last (file->sexp-list cachefile)))])
(if (equal? (cadr (last (file->sexp-list cachefile))) hash)
(print (format "url did not change, hash remains ~a" hash))
(hash-did-change oldhash hash)))
(hash-did-change #f hash))
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