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| -rw-r--r-- | atom.scm | 238 | ||||
| -rw-r--r-- | example.scm | 22 |
2 files changed, 260 insertions, 0 deletions
diff --git a/atom.scm b/atom.scm new file mode 100644 index 0000000..148a5cb --- /dev/null +++ b/atom.scm @@ -0,0 +1,238 @@ +(define-module (atom) + #:use-module (srfi srfi-1) + #:use-module (srfi srfi-9) + #:use-module (srfi srfi-19) + #:use-module (sxml simple) + #:use-module (ice-9 binary-ports) + #:use-module (rnrs bytevectors) + #:export (feed + entry + person + media + render)) + +; ATOM Explanation: http://www.atomenabled.org/developers/syndication/ +; ATOM Validator: https://validator.w3.org/feed/check.cgi + +(define mime-types + '(("3gp" . "audio/3gpp") + ("3gpp" . "audio/3gpp") + ("3g2" . "audio/3gpp2") + ("3gpp2" . "audio/3gpp2") + ("aac" . "audio/aac") + ("adts" . "audio/aac") + ("loas" . "audio/aac") + ("ass" . "audio/aac") + ("au" . "audio/basic") + ("snd" . "audio/basic") + ("mp3" . "audio/mpeg") + ("mp2" . "audio/mpeg") + ("opus" . "audio/opus") + ("oga" . "audio/ogg") + ("aif" . "audio/x-aiff") + ("aifc" . "audio/x-aiff") + ("aiff" . "audio/x-aiff") + ("ra" . "audio/x-pn-realaudio") + ("wav" . "audio/x-wav") + ("avif" . "image/avif") + ("bmp" . "image/bmp") + ("gif" . "image/gif") + ("ief" . "image/ief") + ("jpg" . "image/jpeg") + ("jpe" . "image/jpeg") + ("jpeg" . "image/jpeg") + ("heic" . "image/heic") + ("heif" . "image/heif") + ("png" . "image/png") + ("svg" . "image/svg+xml") + ("tiff" . "image/tiff") + ("tif" . "image/tiff") + ("ico" . "image/vnd.microsoft.icon") + ("ras" . "image/x-cmu-raster") + ("pnm" . "image/x-portable-anymap") + ("pbm" . "image/x-portable-bitmap") + ("pgm" . "image/x-portable-graymap") + ("ppm" . "image/x-portable-pixmap") + ("rgb" . "image/x-rgb") + ("xbm" . "image/x-xbitmap") + ("xpm" . "image/x-xpixmap") + ("xwd" . "image/x-xwindowdump") + ("ogv" . "video/ogv") + ("mp4" . "video/mp4") + ("mpeg" . "video/mpeg") + ("m1v" . "video/mpeg") + ("mpa" . "video/mpeg") + ("mpe" . "video/mpeg") + ("mpg" . "video/mpeg") + ("mov" . "video/quicktime") + ("qt" . "video/quicktime") + ("webm" . "video/webm") + ("avi" . "video/x-msvideo") + ("movie" . "video/x-sgi-movie"))) + +;; Entities +(define-record-type <feed> + (make-feed id title subtitle uri date entries) + feed? + (id feed-id) + (title feed-title) + (subtitle feed-subtitle) + (uri feed-uri) + (date feed-date set-feed-date!) + (entries feed-entries set-feed-entries!)) + +(define-record-type <entry> + (make-entry id title published updated authors summary content categories contributors media) + entry? + (id entry-id set-entry-id!) + (title entry-title) + (published _entry-published) + (updated _entry-updated) + (authors entry-authors) + (summary entry-summary) + (content entry-content) + (categories entry-categories) + (contributors entry-contributors) + (media entry-media)) + +(define (date->string/RFC3339 date) + (date->string date "~4")) +(define (entry-published entry) + (date->string/RFC3339 (_entry-published entry))) +(define (entry-updated entry) + (date->string/RFC3339 (_entry-updated entry))) +(define (string->date/ISO string) + (string->date string "~Y-~m-~d")) + +(define-record-type <media> + (make-media title type length uri path contents) + media? + (title media-title) + (type media-type) + (length media-length) + (uri media-uri) + (path media-path) + (contents media-contents)) + +(define-record-type <person> + (make-person name email uri) + person? + (name person-name) + (email person-email) + (uri person-uri)) + +(define zero-date (string->date/ISO "1970-01-01")) +(define (newest a b) (if (time>? (date->time-utc a) (date->time-utc b)) a b)) +(define (find-newest dates) (reduce newest zero-date dates)) + +(define* (feed #:key (title "") + (subtitle "") + (uri "") + (entries '())) + (make-feed uri + title + subtitle + uri + (find-newest (map entry-updated entries)) + entries)) + +(define* (register-entry! feed entry) + (let ((entries (feed-entries feed))) + (set-entry-id! entry (string-append + (feed-uri feed) "/" + (number->string (length entries)))) ;; TODO: is this enough + (set-feed-entries! feed (append entries (list entry)))) + (set-feed-date! feed (find-newest (map entry-updated + (feed-entries feed))))) + + +(define* (entry feed #:key (title "") + (published "1970-01-01") + (updated "1970-01-01") + (authors '()) + (summary-html '()) + (content-html '()) + (categories '()) + (contributors '()) + (media '())) + + (register-entry! feed + (make-entry #f + title + (string->date/ISO published) + (find-newest (map string->date/ISO + (list published updated))) + authors + summary-html + content-html + categories + contributors + media))) + +(define* (person name #:key (email "") + (uri "")) + (make-person name email uri)) + + +(define* (media path #:key (title "") + (uri "")) + (define (type path) + (let* ((extension (car (last-pair (string-split path #\.)))) + (type (assoc-ref mime-types extension))) + (if (string? type) type (throw "Unknown mime-type")))) + (let ((contents (call-with-input-file path get-bytevector-all #:binary #t))) + (make-media title + (type path) + (bytevector-length contents) + uri + path + contents))) + +;; Rendering +(define (render-person tag person) + `(,tag + (name ,(person-name person)) + (uri ,(or (person-uri person) "")) + (email ,(or (person-email person) "")))) + +(define (partial f . set) + (lambda (. args) (apply f (append set args)))) +(define render-author (partial render-person 'author)) +(define render-contributor (partial render-person 'contributor)) + +(define (render-media med) + `(link (@(rel enclosure) + (href ,(media-uri med)) + (type ,(media-type med)) + (title ,(media-title med)) + (length ,(media-length med))))) + +(define (render-category cat) + `(category (@(term ,cat)))) + +(define (render-entry ent) + `(entry + (id ,(entry-id ent)) + (title ,(entry-title ent)) + (published ,(entry-published ent)) + (updated ,(entry-updated ent)) + ,@(map render-author (entry-authors ent)) + (summary (@(type html)) ,(entry-summary ent)) + (content (@(type html)) ,(entry-content ent)) + ,@(map render-category (entry-categories ent)) + ,@(map render-contributor (entry-contributors ent)) + ,@(map render-media (entry-media ent)))) + +(define (render-feed fe) + `(feed (@(xmlns "http://www.w3.org/2005/Atom")) + (id ,(feed-id fe)) + (title ,(feed-title fe)) + (link (@(href ,(feed-uri fe)) + (rel "self"))) + (updated ,(feed-date fe)) + (subtitle ,(feed-subtitle fe)) + ,@(map render-entry (feed-entries fe)))) + +(define* (render feed #:optional (port (current-output-port))) + (display "<?xml version=\"1.0\" encoding=\"utf-8\"?>" port) + (sxml->xml (render-feed feed)) port) diff --git a/example.scm b/example.scm new file mode 100644 index 0000000..0bb7255 --- /dev/null +++ b/example.scm @@ -0,0 +1,22 @@ +(define-module (content) + #:use-module ((atom) #:prefix atom:)) + +(define me (atom:person "Ekaitz" + #:email "ekaitz@elenq.tech" + #:uri "https://elenq.tech")) + +(define feed (atom:feed #:title "Mi feed" + #:subtitle "Este es mi feed" + #:uri "https://thoughts.elenq.tech")) + +(atom:entry feed + #:title "first entry" + #:published "2023-03-01" + #:authors (list me) + #:summary-html '(p "Este es el resumen") + #:content-html '(p "Este es el contenido") + #:categories (list "una" "dos" "tres") + #:media (list (atom:media "../HOLA.webm" #:title "01" + #:uri ""))) + +(atom:render feed) |