From 9b53537b89d83fd7ade6a8707bb932d46564519a Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Sat, 18 Jul 2020 05:46:59 +0530
Subject: Rename ennu to ennum.

* ennu.el: Rename to ...
* ennum.el: ... this. Replace all instances of ennu with ennum.
* ennu-html.el: Rename to ...
* ennum-html.el: ... this. Replace all instances of ennu with ennum.
* ennu-image.el: Rename to ...
* ennum-image.el: ... this. Replace all instances of ennu with ennum.
---
 ennum.el | 534 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 534 insertions(+)
 create mode 100644 ennum.el

(limited to 'ennum.el')

diff --git a/ennum.el b/ennum.el
new file mode 100644
index 0000000..69a7b5b
--- /dev/null
+++ b/ennum.el
@@ -0,0 +1,534 @@
+;; -*- lexical-binding: t -*-
+
+(require 'ennum-html)
+(require 'ennum-image)
+(require 'ox)
+(require 'seq)
+(require 'cl)
+(require 'map)
+(require 'memoize)
+(require 'simple-httpd)
+
+(defvar ennum-version "0.1.0"
+  "Ennum version string")
+
+(cl-defstruct (ennum-post (:constructor ennum-make-post)
+                         (:copier nil))
+  filename slug author date language links tangle
+  summary tags thumbnail title translation-group)
+
+(cl-defstruct (ennum-operation (:constructor ennum-make-operation)
+                              (:copier nil))
+  inputs outputs publish)
+
+(defun ennum-posts (posts-directory)
+  (sort (seq-map 'ennum-read-post
+                 (file-expand-wildcards
+                  (concat (file-name-as-directory
+                           (ennum-setting :posts-directory))
+                          "*.org")))
+        'ennum-later-post-p))
+
+(defun ennum-later-post-p (post1 post2)
+  (time-less-p (ennum-post-date post2)
+               (ennum-post-date post1)))
+
+(defun ennum-read-post (filename)
+  (ennum--read-post
+   filename (file-attribute-modification-time
+             (file-attributes filename))))
+
+(defmemoize ennum--read-post (filename last-modified)
+  (ennum-with-file-contents filename
+    (let ((metadata (org-export-get-environment 'ennum-html))
+          (export (apply-partially 'org-export-with-backend 'ennum-html)))
+      (seq-do (lambda (key)
+                (unless (plist-member metadata key)
+                  (user-error "Metadata %s not specified" key)))
+              ennum-mandatory-metadata)
+      (let* ((tree (org-element-parse-buffer))
+             (links (org-element-map tree 'link
+                      (lambda (link)
+                        (pcase link
+                          (`(link ,properties . ,_)
+                           (let ((link-type (org-element-property :type link)))
+                             (when (member link-type (list "image" "static" "video"))
+                               (cons link-type (org-element-property :path link))))))))))
+        (ennum-make-post
+         :filename filename
+         :slug (file-name-base filename)
+         :author (when-let (author (plist-get metadata :author))
+                   (funcall export (first author)))
+         :date (org-timestamp-to-time (first (plist-get metadata :date)))
+         :language (plist-get metadata :language)
+         :links links
+         ;; TODO: Deal with cases when the :tangle parameter is "yes"
+         :tangle (seq-uniq
+                  (org-element-map tree 'src-block
+                    (lambda (src-block)
+                      (pcase (org-babel-get-src-block-info nil src-block)
+                        (`(,_ ,_ ,arguments ,_ ,_ ,_ ,_)
+                         (let ((tangle-output-file (map-elt arguments :tangle)))
+                           (pcase tangle-output-file
+                             ("no" nil)
+                             (_ tangle-output-file))))))))
+         :summary (when-let (summary (plist-get metadata :summary))
+                    (funcall export (first summary)))
+         :tags (plist-get metadata :filetags)
+         :thumbnail (or (plist-get metadata :thumbnail)
+                        (seq-some (lambda (link)
+                                    (pcase link
+                                      (`("image" . ,path) path)
+                                      (`("video" . ,path) (ennum-video-poster path))))
+                                  links))
+         :title (funcall export (first (plist-get metadata :title)))
+         :translation-group (or (plist-get metadata :translation-group)
+                                (file-name-base filename)))))))
+
+(defvar ennum-mandatory-metadata
+  (list :title :date))
+
+(defmacro ennum-with-file-contents (file &rest body)
+  "Create a temporary buffer, insert contents of FILE into that
+buffer and evaluate BODY. The value returned is the value of the
+last form in BODY."
+  (declare (indent defun))
+  `(with-temp-buffer
+     (insert-file-contents ,file)
+     ,@body))
+
+(defun ennum--org-output-filename (filename)
+  (concat (file-name-sans-extension filename) ".html"))
+
+(defun ennum-publish-post (posts)
+  (let ((link-publish-operations
+         (seq-mapcat 'ennum-publish-link (seq-mapcat 'ennum-post-links posts)))
+        (input-post-files (seq-map 'ennum-post-filename posts)))
+    (append
+     (list
+      (ennum-make-operation
+       :inputs (append input-post-files
+                       (seq-mapcat 'ennum-operation-inputs link-publish-operations))
+       :outputs (seq-map 'ennum--org-output-filename input-post-files)
+       :publish
+       (lambda (&rest output-files)
+         (seq-mapn
+          (lambda (post output-file)
+            (let ((system-time-locale (map-elt (ennum-setting :locale-alist)
+                                               (ennum-post-language post) nil 'string=)))
+              (ennum-with-file-contents (ennum-post-filename post)
+                (org-export-to-file
+                    'ennum-html output-file nil nil nil nil
+                    (list :translations (seq-remove (apply-partially 'equal post) posts))))))
+          posts
+          output-files))))
+     (ennum--filter-map
+      (lambda (post)
+        (when (ennum-post-tangle post)
+          (ennum-make-operation
+           :inputs (list (ennum-post-filename post))
+           :outputs (seq-map (lambda (tangle-output)
+                               (ennum--expand-relative tangle-output
+                                                      (ennum-setting :static-directory)))
+                             (ennum-post-tangle post))
+           :publish (lambda (&rest output-files)
+                      ;; TODO: Handle tangle outputs that are nested
+                      ;; into directories, and when each tangle output
+                      ;; is nested into a different directory.
+                      (let ((post-file-copy (concat
+                                             (file-name-directory (first output-files))
+                                             (file-name-nondirectory (ennum-post-filename post)))))
+                        (copy-file (ennum-post-filename post) post-file-copy)
+                        (org-babel-tangle-file post-file-copy)
+                        (delete-file post-file-copy))))))
+      posts)
+     link-publish-operations)))
+
+(defun ennum-publish-generic (other-files-directory file)
+  (ennum-make-operation
+   :inputs (list file)
+   :outputs
+   (list (string-remove-prefix
+          (file-name-as-directory other-files-directory)
+          (pcase (file-name-extension file)
+            ("org" (ennum--org-output-filename file))
+            (_ file))))
+   :publish (lambda (output-file)
+              (pcase (file-name-extension file)
+                ("org" (ennum-with-file-contents file
+                         (org-export-to-file 'html output-file)))
+                (_ (ennum-copy file output-file))))))
+
+(defun ennum-video-poster (video)
+  (pcase (directory-files (ennum-setting :images-directory) nil
+                          (concat (file-name-sans-extension video)
+                                  "\\.\\(jpg\\|png\\)$"))
+    (`(,poster . ,_) poster)
+    (`() (user-error "Poster for %s not found" video))))
+
+(defun ennum-add-tongue-suffix (filename tongue)
+  (pcase tongue
+    ("en" filename)
+    (_ (format "%s.%s%s"
+               (file-name-sans-extension filename)
+               tongue
+               (file-name-extension filename t)))))
+
+(defun ennum-index-filename (filename-prefix tongue &optional extension page-number)
+  (let ((extension (if extension (concat "." extension) "")))
+    (ennum-add-tongue-suffix
+     (if page-number
+         (format "%s-%s%s" filename-prefix page-number extension)
+       (concat filename-prefix extension))
+     tongue)))
+
+(defun ennum-publish-index (filename-prefix title posts-per-page posts)
+  (let* ((tongue (ennum-post-language (first posts)))
+         (number-of-pages (ceiling (length posts) posts-per-page))
+         (page-numbers (number-sequence 1 number-of-pages)))
+    (ennum-make-operation
+     :inputs (seq-map 'ennum-post-filename posts)
+     :outputs (cons (ennum-add-tongue-suffix (format "%s.html" filename-prefix) tongue)
+                    (seq-map (apply-partially 'ennum-index-filename filename-prefix tongue "html")
+                             page-numbers))
+     :publish
+     (lambda (home-page &rest output-files)
+       (let ((system-time-locale (map-elt (ennum-setting :locale-alist) tongue nil 'string=)))
+         (seq-mapn
+          (lambda (posts page-number output-file)
+            (with-temp-buffer
+              (insert (format "#+TITLE: %s\n" title))
+              (insert (format "#+LANGUAGE: %s\n" tongue))
+              (insert "#+OPTIONS: num:nil toc:nil\n\n")
+              (seq-do (lambda (post)
+                        (insert (format "* [[post:%s]]\n" (ennum-post-slug post)))
+                        (insert (format-time-string "/%b %e, %Y/\n\n" (ennum-post-date post)))
+                        (when-let ((thumbnail (ennum-post-thumbnail post)))
+                          (insert (format "[[thumbnail:%s]]\n\n" thumbnail)))
+                        (when-let ((summary (ennum-post-summary post)))
+                          (insert summary)
+                          (insert "\n\n"))
+                        (when-let ((tags (ennum-post-tags post)))
+                          (insert "Tags: ")
+                          (insert
+                           (string-join
+                            (seq-map (lambda (tag)
+                                       (format "[[tag:%s][%s]]" (ennum-add-tongue-suffix tag tongue) tag))
+                                     tags)
+                            ", "))
+                          (insert "\n\n")))
+                      posts)
+              (unless (= page-number 1)
+                (insert (format "[[./%s][Newer posts]]\n\n"
+                                (ennum-index-filename (file-name-nondirectory filename-prefix)
+                                                     tongue nil (1- page-number)))))
+              (unless (= page-number number-of-pages)
+                (insert (format "[[./%s][Older posts]]\n"
+                                (ennum-index-filename (file-name-nondirectory filename-prefix)
+                                                     tongue nil (1+ page-number)))))
+              (org-export-to-file 'html output-file)))
+          (seq-partition posts posts-per-page)
+          page-numbers
+          output-files))
+       (copy-file (first output-files) home-page)))))
+
+(defun ennum--absolute-uri (path)
+  (format "%s://%s/%s"
+          (ennum-setting :blog-scheme)
+          (ennum-setting :blog-domain)
+          path))
+
+(defun ennum--atom-date (date)
+  (format-time-string "%Y-%m-%dT%H:%M:%SZ" date))
+
+(defun ennum-publish-feed (feed-file title rights posts)
+  (ennum-make-operation
+   :inputs (seq-map 'ennum-post-filename posts)
+   :outputs (list feed-file)
+   :publish
+   (lambda (output-file)
+     (with-temp-file output-file
+       (insert
+        (xmlgen
+         `(feed :xmlns "http://www.w3.org/2005/Atom"
+                (id ,(ennum--absolute-uri ""))
+                (title ,title)
+                (updated ,(ennum--atom-date (ennum-post-date (first posts))))
+                (link :rel "self" :href ,(ennum--absolute-uri feed-file))
+                (generator
+                 ,(format "Emacs %d.%d Org-mode %s ennum %s"
+                          emacs-major-version emacs-minor-version (org-version) ennum-version))
+                (rights ,rights)
+                ,@(seq-map 'ennum--feed-entry posts))))))))
+
+(defun ennum--feed-entry (post)
+  (let ((link (ennum--absolute-uri (ennum--org-output-filename
+                                   (ennum-post-filename post)))))
+    `(entry (id ,link)
+            (title :xml:lang ,(ennum-post-language post) ,(ennum-post-title post))
+            (updated ,(ennum--atom-date (ennum-post-date post)))
+            ,@(when org-export-with-author
+                `((author
+                   (name ,(ennum-post-author post))
+                   (email ,user-mail-address))))
+            (content :type "html" :xml:lang ,(ennum-post-language post)
+                     ,(ennum-with-file-contents (ennum-post-filename post)
+                        (org-export-as 'ennum-html nil nil t)))
+            (link :rel "alternate" :href ,link)
+            ,@(seq-map (lambda (tag) `(category :term ,tag))
+                       (ennum-post-tags post)))))
+
+(defun ennum-setting (property)
+  (pcase property
+    ((or :blog-domain :blog-license :blog-title
+         :images-directory :output-directory :posts-directory
+         :static-directory :tag-directory :video-directory
+         :working-directory)
+     (or (plist-get ennum-blog property)
+         (user-error "Property %s not defined" property)))
+    ((or :atom-feed-number-of-posts :atom-feed-file
+         :blog-scheme :default-image-width
+         :image-link-width :index-posts-per-page
+         :locale-alist :other-files-directory
+         :tag-directory :thumbnail-image-width)
+     (plist-get (org-combine-plists
+                 (list :atom-feed-number-of-posts 12
+                       :atom-feed-file "blog.atom"
+                       :blog-scheme "https"
+                       :default-image-width 640
+                       :image-link-width 1024
+                       :index-posts-per-page 12
+                       :locale-alist '(("en" . "C"))
+                       :tag-directory "tag"
+                       :thumbnail-image-width 320)
+                 ennum-blog)
+                property))
+    (_ (error "Unknown property %s" property))))
+
+(defun ennum-image-output-filename (image width)
+  (format "%s-%spx.%s"
+          (file-name-sans-extension image)
+          width (file-name-extension image)))
+
+(defun ennum--expand-relative (name directory)
+  (concat (file-name-as-directory directory) name))
+
+(defun ennum-publish-image (widths image)
+  (ennum-make-operation
+   :inputs (list image)
+   :outputs (seq-map (apply-partially 'ennum-image-output-filename image)
+                     widths)
+   :publish
+   (lambda (&rest output-files)
+     (seq-mapn (lambda (output-file width)
+                 (ennum-image-optimize-image
+                  (ennum-image-resize-image image output-file width)))
+               output-files widths))))
+
+(defun ennum-publish-copy (file)
+  (ennum-make-operation
+   :inputs (list file)
+   :outputs (list file)
+   :publish (apply-partially 'ennum-copy file)))
+
+(defun newest-file (files)
+  (pcase files
+    (`(,head . ,tail)
+     (seq-reduce (lambda (file1 file2)
+                   (if (file-newer-than-file-p file1 file2)
+                       file1 file2))
+                 tail head))))
+
+(defun ennum-mkdir-p (directory)
+  (make-directory directory t))
+
+(defun ennum-copy (source destination)
+  "Copy file or directory from SOURCE to DESTINATION. Overwrite
+if DESTINATION already exists."
+  (if (file-directory-p source)
+      (copy-directory source destination)
+    (make-directory (file-name-directory destination) t)
+    (copy-file source destination t)))
+
+(defun ennum--filter-map (function sequence)
+  (seq-filter 'identity (seq-map function sequence)))
+
+;; TODO: What if a file was removed from the inputs? Detect that
+;; change as well.
+
+;; Two separate problems
+;; - tracking of list of inputs
+;; - depending on a function of inputs, or equivalently intermediate files
+
+;; Solve both problems with an "ennum store"
+(defun ennum--do-operation (temporary-directory operation)
+  ;; TODO: Check all outputs were created correctly.
+  (let* ((expand (lambda (directory file)
+                   (expand-file-name file directory)))
+         (inputs (ennum-operation-inputs operation))
+         (outputs (ennum-operation-outputs operation))
+         (absolute-outputs
+          (seq-map (apply-partially expand temporary-directory)
+                   outputs))
+         (previous-outputs
+          (seq-map (apply-partially expand (ennum-setting :output-directory))
+                   outputs)))
+    (cond
+     ((and (seq-every-p 'file-exists-p previous-outputs)
+           (file-newer-than-file-p (newest-file previous-outputs)
+                                   (newest-file inputs)))
+      (message "Skipping publishing %s to %s" inputs outputs)
+      (seq-mapn 'ennum-copy previous-outputs absolute-outputs))
+     (t (message "Publishing %s to %s" inputs outputs)
+        (seq-do 'ennum-mkdir-p
+                (seq-uniq
+                 (seq-map 'file-name-directory absolute-outputs)))
+        (apply (ennum-operation-publish operation) absolute-outputs)))))
+
+(defun ennum-publish-static-file (file)
+  (ennum-make-operation
+   :inputs (list file)
+   :outputs (list file)
+   :publish (apply-partially 'ennum-copy file)))
+
+(defun ennum-publish-link (link)
+  (pcase link
+    (`("image" . ,path)
+     (list
+      (ennum-publish-image
+       (list (ennum-setting :default-image-width)
+             (ennum-setting :image-link-width))
+       (ennum--expand-relative path (ennum-setting :images-directory)))))
+    (`("static" . ,path)
+     (list
+      (ennum-publish-copy (ennum--expand-relative path (ennum-setting :static-directory)))))
+    (`("video" . ,path)
+     (list
+      (ennum-publish-copy (ennum--expand-relative path (ennum-setting :video-directory)))
+      (ennum-publish-copy (ennum--expand-relative (ennum-video-poster path)
+                                                (ennum-setting :images-directory)))))))
+
+(defmacro ennum-with-current-directory (directory &rest body)
+  "Change to DIRECTORY, evaluate BODY and restore the current
+working directory. The value returned is the value of the last
+form in BODY."
+  (declare (indent defun))
+  (let ((current-directory-symbol (make-symbol "current-directory")))
+    `(let ((,current-directory-symbol default-directory))
+       (unwind-protect (progn (cd ,directory) ,@body)
+         (cd ,current-directory-symbol)))))
+
+(defmacro ennum-with-temporary-directory (temporary-directory &rest body)
+  "Create temporary directory, evaluate BODY with the absolute
+path of that directory assigned to TEMPORARY-DIRECTORY and
+finally delete the temporary directory. The value returned is the
+value of the last form in BODY."
+  (declare (indent defun))
+  `(let ((,temporary-directory (make-temp-file "ennum" t)))
+     (chmod ,temporary-directory #o755)
+     (unwind-protect
+         (progn ,@body)
+       (delete-directory ,temporary-directory t))))
+
+(defun ennum-many-to-many-group-by (function sequence)
+  "Apply FUNCTION to each element of SEQUENCE.
+Separate the elements of SEQUENCE into an alist using the results
+as keys. Keys are compared using `equal'."
+  (seq-reduce
+   (lambda (result element)
+     (seq-do
+      (lambda (key)
+        (map-put result key
+                 (cons element (map-elt result key nil 'equal))
+                 'equal))
+      (funcall function element))
+     result)
+   (seq-reverse sequence)
+   nil))
+
+(defun ennum-publish ()
+  (interactive)
+  (let ((make-backup-files nil)
+        (blog-title (ennum-setting :blog-title))
+        (posts-per-page (ennum-setting :index-posts-per-page)))
+    (ennum-with-current-directory (ennum-setting :working-directory)
+      (ennum-with-temporary-directory temporary-directory
+        (seq-do
+         (apply-partially 'ennum--do-operation temporary-directory)
+         (append
+          (let ((posts (ennum-posts (ennum-setting :posts-directory))))
+            (append
+             ;; Publish posts
+             (seq-mapcat (pcase-lambda (`(,translation-group . ,posts))
+                           (ennum-publish-post posts))
+                         (seq-group-by 'ennum-post-translation-group posts))
+             ;; Publish feed
+             (list (ennum-publish-feed (ennum-setting :atom-feed-file)
+                                      blog-title
+                                      (ennum-setting :blog-license)
+                                      (seq-take posts (ennum-setting :atom-feed-number-of-posts))))
+             ;; Publish indices
+             (seq-map
+              (pcase-lambda (`(,tongue . ,posts))
+                (ennum-publish-index "index" blog-title posts-per-page posts))
+              (seq-group-by 'ennum-post-language posts))
+             (seq-mapcat
+              (pcase-lambda (`(,tag . ,posts))
+                (seq-map
+                 (pcase-lambda (`(,tongue . ,posts))
+                   (ennum-publish-index
+                    (ennum--expand-relative tag (ennum-setting :tag-directory))
+                    tag posts-per-page posts))
+                 (seq-group-by 'ennum-post-language posts)))
+              (ennum-many-to-many-group-by 'ennum-post-tags posts))
+             ;; Publish thumbnails
+             (seq-map
+              (apply-partially 'ennum-publish-image (list (ennum-setting :thumbnail-image-width)))
+              (seq-map (lambda (image)
+                         (ennum--expand-relative image (ennum-setting :images-directory)))
+                       (seq-uniq (ennum--filter-map 'ennum-post-thumbnail posts))))))
+          ;; Publish other files
+          (when-let ((other-files-directory (ennum-setting :other-files-directory)))
+            (seq-map (apply-partially 'ennum-publish-generic other-files-directory)
+                     (seq-map (apply-partially 'string-remove-prefix
+                                               (file-name-as-directory (expand-file-name default-directory)))
+                              (directory-files-recursively other-files-directory "."))))))
+        ;; Replace old output directory
+        (let ((output (ennum-setting :output-directory)))
+          (delete-directory output t)
+          (rename-file temporary-directory output t))))))
+
+;;; Server
+;;;
+;;; Test HTTP server to serve the blog locally
+
+;; TODO: Why can't simple-httpd itself handle the unhexing?
+(defun ennum-server-start ()
+  (interactive)
+  (setq httpd-root (expand-file-name (ennum-setting :output-directory)
+                                     (ennum-setting :working-directory)))
+  (defun httpd/ (proc uri-path query request)
+    (let* ((uri-path (httpd-unhex uri-path))
+           (file-path (httpd-gen-path uri-path)))
+      (cond
+       ;; If a HTML file other than index.html was requested, reject
+       ;; that request.
+       ((and (not (string= (file-name-nondirectory file-path) "index.html"))
+             (string= (file-name-extension file-path) "html"))
+        (httpd-error proc 404))
+       ;; If the requested file was found, serve it.
+       ((= (httpd-status file-path) 200)
+        (httpd-serve-root proc httpd-root uri-path request))
+       ;; Perhaps, this is a post or other HTML file that is being
+       ;; requested. Try serving a file with a .html extension
+       ;; appended.
+       (t (httpd-serve-root proc httpd-root (concat uri-path ".html") request)))))
+  (httpd-start)
+  (message "Ennum web server listening at http://localhost:%d" httpd-port))
+
+(defun ennum-server-stop ()
+  (interactive)
+  (httpd-stop)
+  (message "Ennum web server stopped"))
+
+(provide 'ennum)
-- 
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