31 Jan 2026

starting a blog

1. Blog experiments

I have been thinking about starting a blog for some time, but after reading https://dou-meishi.github.io/org-blog/2024-01-22-TryOrgStaticBlog/notes.html#org811a1c5 ¹ I started to experiment.

https://github.com/bastibe/org-static-blog/blob/master/README.org

The only requirement is that every org file must have a #+TITLE and a #+DATE, and optionally, #+FILETAGS, #+DESCRIPTION and #+IMAGE.

2. Chronological log

2.1. 2026-01-22 plain HTML export

Using ./j0rat.html as an example, I exported it to HTML using C-c C-e h. The following warning was shown

■ Warning (emacs): Cannot fontify source block (htmlize.el >= 1.34
required).  Falling back to plain text.  (see
‘org-html-htmlize-output-type’)

but a HTML file was produced.

Opening the file in either Firefox or Chrome using the URL p/j0rat/j0rat.html failed, because the browsers are not permitted to access files owned by the `termux~ user. After copying the HTML file to file:///data/data/com.termux/files/home/storage/downloads/bt/j0rat.html (which is another name for file:///storage/emulated/0/Download/bt/j0rat.html)

file:///storage/emulated/0/Download/bt/j0rat.html

I could not open it, but the search engine translated the URL to content://com.android.externalstorage.documents/document/primary%3ADownload%2Fbt%2Fj0rat.html /When marked up as link, org-mode produces the following error

user-error: Org export aborted.  Unable to resolve link: "content://com.android.externalstorage.documents/document/primary%3ADownload%2Fbt%2Fj0rat.html"
See ‘org-export-with-broken-links’

2.2. Android is inadequate 2026-01-26

Similar attempts opening file:/// URLs on anderl were also unsuccessful, my conclusion is that Android is inadequate for local creation amd test of a website.

2.3. TODO `[4/8]` Next steps 2026-01-27

I read Dou-Meishi's description https://dou-meishi.github.io/org-blog/2024-01-22-TryOrgStaticBlog/notes.html#org811a1c5 org-static-blog and want to try a similar setup. So I need to

[X] install org-static-blog
[X] configure it
[X] create an "about" page
[X] render, copy HTML to iwasno.net
[ ] improve design
[ ] CSS experiments
[ ] formula rendering: MathJax, KaTeX, pre-rendered MathJax
[ ] upgrade to ox-tufte?

2.4. TODO `[2/2]` 2026-01-28

Evaluated the following on rhea

(package-install 'org-static-blog)

The first time nothing appeared to happen, bu evaluating the expression again produced the message to be continued "already installed" or something similar Clean up the messages below

Importing package-keyring.gpg...done
Package refresh done [3 times]
Saving file /data/data/com.termux/files/home/.emacs...
Wrote /data/data/com.termux/files/home/.emacs
Saving file /data/data/com.termux/files/home/.emacs...
Wrote /data/data/com.termux/files/home/.emacs
Parsing tar file...done
Extracting...done
  INFO     Scraping 2 files for loaddefs...done
  GEN      org-static-blog-autoloads.el
Checking /data/data/com.termux/files/home/.emacs.d/elpa/org-static-blog-20250320.1842... [3 times]
Compiling /data/data/com.termux/files/home/.emacs.d/elpa/org-static-blog-20250320.1842/org-static-blog.el...done
Wrote /data/data/com.termux/files/home/.emacs.d/elpa/org-static-blog-20250320.1842/org-static-blog.elc
Checking /data/data/com.termux/files/home/.emacs.d/elpa/org-static-blog-20250320.1842...
Done (Total of 1 file compiled, 2 skipped)
Package ‘org-static-blog’ installed.
"Package ‘org-static-blog’ installed."

Copied https://dou-meishi.github.io/org-blog/2024-01-22-TryOrgStaticBlog/notes.html#org811a1c5 to ./2024-01-22-TryOrgStaticBlog.txt, extracted ./static/header.html ./static/postamble.html and ./static/preamble.html Adapted them slightly.

[X] Need style.css,
[X] favicon.icos

Extracted ./blog-settings.el,

2.5. 2026-01-31

needed to create blog/drafts

 ■  Warning (org-element): org-element--cache: Added org-data parent to non-headline element: (section (:standard-properties [532995 532995 532995 533102 533102 0 nil section element t (284 . 532997) 532995 533102 nil #<buffer rhea3.org> nil nil (headline (:standard-properties [532950 532950 532963 533105 533105 0 (:title) nil element nil (284 . 532953) 532965 533105 1 #<buffer rhea3.org> [org-element-deferred org-element--headline-deferred nil t] nil (org-data (:standard-properties [1 1 1 553521 553521 0 nil org-data nil t nil 3 553521 nil #<buffer rhea3.org> [org-element-deferred org-element--get-global-node-properties nil t] nil nil] :path "/data/data/com.termux/files/home/p/rhea3.org" :fragile-cache nil))] :pre-blank 0 :raw-value [org-element-deferred org-element--headline-parse-title (t) t] :title [org-element-deferred org-element--headline-parse-title (t) t] :level [org-element-deferred org-element--headline-parse-title (t) t] :priority [org-element-deferred org-element--headline-parse-title (t) t] :tags [org-element-deferred org-element--headline-parse-title (t) t] :todo-keyword [org-element-deferred org-element--headline-parse-title (t) t] :todo-type [org-element-deferred org-element--headline-parse-title (t) t] :footnote-section-p [org-element-deferred org-element--headline-parse-title (t) t] :archivedp [org-element-deferred org-element--headline-parse-title (t) t] :commentedp [org-element-deferred org-element--headline-parse-title (t) t]))]))
If this warning appears regularly, please report the warning text to Org mode mailing list (M-x org-submit-bug-report).
 ■  Warning (org-element): org-element--cache: Org parser error in rhea3.org::553603. Resetting.
 The error was: (error "Invalid search bound (wrong side of point)")
 Backtrace:
nil
 Please report this to Org mode mailing list (M-x org-submit-bug-report).
 ■  Warning (emacs): Cannot fontify source block (htmlize.el >= 1.34 required).  Falling back to plain text.  (see ‘org-html-htmlize-output-type’)
 ■  Warning (emacs): Cannot fontify source block (htmlize.el >= 1.34 required).  Falling back to plain text.  (see ‘org-html-htmlize-output-type’)
 ■  Warning (emacs): ~/p/j0rat/blog/org/blog-notes.org file does not have a title, using ~/p/j0rat/blog/org/blog-notes.org as the title
 ■  Warning (emacs): ~/p/j0rat/blog/org/blog-notes.org file does not have a title, using ~/p/j0rat/blog/org/blog-notes.org as the title
 ■  Warning (emacs): Cannot fontify source block (htmlize.el >= 1.34 required).  Falling back to plain text.  (see ‘org-html-htmlize-output-type’)

3. 2026-02-01

create symbolic links from blog/org/ to the .org files added TITLE, DATE and FILETAGS to thsi file and j0rat.org.

4. 2026-02-02

evaluated

(package-install 'htmlize)

this time, the installation was reported in both the minibuffer and *Messages*:

Contacting host: melpa.org:443 [2 times]
Parsing tar file...done
Extracting...done
  INFO     Scraping 2 files for loaddefs...done
  GEN      htmlize-autoloads.el
Checking /data/data/com.termux/files/home/.emacs.d/elpa/htmlize-20250724.1703... [3 times]
Compiling /data/data/com.termux/files/home/.emacs.d/elpa/htmlize-20250724.1703/htmlize.el...done
Wrote /data/data/com.termux/files/home/.emacs.d/elpa/htmlize-20250724.1703/htmlize.elc
Checking /data/data/com.termux/files/home/.emacs.d/elpa/htmlize-20250724.1703...
Done (Total of 1 file compiled, 2 skipped)
Package ‘htmlize’ installed.
"Package ‘htmlize’ installed."

After correcting ./blog-settings.el, org-static-blog~publish produced the following files file:///data/data/com.termux/files/home/p/j0rat/blog/archive.html file:///data/data/com.termux/files/home/p/j0rat/blog/index.html file:///data/data/com.termux/files/home/p/j0rat/blog/tag-mathematics.html file:///data/data/com.termux/files/home/p/j0rat/blog/tag-meta.html file:///data/data/com.termux/files/home/p/j0rat/blog/tags.html and, somewhat mislaid file:///data/data/com.termux/files/home/p/j0rat.html file:///data/data/com.termux/files/home/p/blog-notes.html

5. 2026-02-03

j0rat.html refers via href to the following files

15 matches in 14 lines for "href=" in buffer: j0rat.html
    7:      href="~/p/j0rat/blog/rss.xml"
   12:<link href= "static/style.css" rel="stylesheet" type="text/css" />
   13:<link href="static/favicon.ico" rel="icon" />
   21:<div class="post-date">01 Feb 2026</div><h1 class="post-title"><a href="~/p/j0rat/blog/../../j0rat.html">rational minimax approximation for J₀(x)</a></h1>
   26:<li><a href="#org84ad828">1. Introduction</a>
   28:<li><a href="#orgb0ad37d">1.1. Plotting</a></li>
   29:<li><a href="#org9c6f9ce">1.2. <span class="done DONE">DONE</span> Fix git configuration</a></li>
   30:<li><a href="#org6eddd1c">1.3. Another idea</a></li>
   31:<li><a href="#orged3198f">1.4. Meta</a></li>
   45:<a href="https://dlmf.nist.gov/3.11#iii">https://dlmf.nist.gov/3.11#iii</a> describes a rational minimax
   50:<a href="https://dlmf.nist.gov/10.3">https://dlmf.nist.gov/10.3</a> confirms that. I shall look at the
   87:<a href="https://dlmf.nist.gov/3.11#F1">https://dlmf.nist.gov/3.11#F1</a> shows
  133:<div class="taglist"><a href="~/p/j0rat/blog/tags.html">Tags</a>: <a href="~/p/j0rat/blog/tag-mathematics.html">mathematics</a> </div></div>
  134:<div id="postamble" class="status">Created by <a href="https://github.com/bastibe/org-static-blog/">Org Static Blog</a></div>

6. 2026-02-04

Added Emacs version, name of the machine rendering the .org files and a version of the settings to org-static-blog-page-postamble. After moving the .org files to blog/org/, thr .html files end up in blog/, but some files were not updated:

/data/data/com.termux/files/home/p/j0rat/blog:
drwx------. 4 u0_a150 u0_a150  4096 Feb  4 09:35 .
drwx------. 6 u0_a150 u0_a150  4096 Feb  4 09:30 ..
-rw-------. 1 u0_a150 u0_a150  1038 Feb  2 19:09 archive.html
-rw-------. 1 u0_a150 u0_a150 15916 Feb  4 09:35 blog-notes.html
-rw-------. 1 u0_a150 u0_a150  1192 Feb  4 09:35 draft.html
drwx------. 2 u0_a150 u0_a150  4096 Feb  4 09:35 drafts
-rw-------. 1 u0_a150 u0_a150  1691 Feb  2 19:09 index.html
-rw-------. 1 u0_a150 u0_a150  4842 Feb  4 09:35 j0rat.html
drwx------. 2 u0_a150 u0_a150  4096 Feb  4 11:16 org
lrwxrwxrwx. 1 u0_a150 u0_a150    18 Jan 30 18:21 plot -> ../plot/
-rw-------. 1 u0_a150 u0_a150 16670 Feb  2 19:09 rss.xml
lrwxrwxrwx. 1 u0_a150 u0_a150    18 Jan 30 18:21 static -> ../static/
-rw-------. 1 u0_a150 u0_a150  1162 Feb  2 19:09 tag-mathematics.html
-rw-------. 1 u0_a150 u0_a150  1417 Feb  2 19:09 tag-meta.html
-rw-------. 1 u0_a150 u0_a150  1140 Feb  2 19:09 tags.html

My old home page https://roland.iwasno.net uses 9atom-style.css and roland.ico as favicon. I tried to download them from the BGA guest network, but failed.

u0_a150@rhea:~/.../blog/static$ scp rlk@iwasno.net:/var/www.roland.iwasno.net/9atom-style.css .

ssh: connect to host iwasno.net port 8738: Network is unreachable
scp: Connection closed
u0_a150@rhea:~/.../blog/static$
u0_a150@rhea:~/.../blog/static$ pi
PING 5.9.120.57 (5.9.120.57) 56(84) bytes of data.

--- 5.9.120.57 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2061ms

u0_a150@rhea:~/.../blog/static$ pi
PING 5.9.120.57 (5.9.120.57) 56(84) bytes of data.

--- 5.9.120.57 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2039ms

u0_a150@rhea:~/.../blog/static$

Got them via https

u0_a150@rhea:~/.../blog/static$ wget https://roland.iwasno.net/roland.ico
--2026-02-04 13:27:56--  https://roland.iwasno.net/roland.ico
Resolving roland.iwasno.net (roland.iwasno.net)... 5.9.120.57, 2a01:4f8:162:7019::2
Connecting to roland.iwasno.net (roland.iwasno.net)|5.9.120.57|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1150 (1.1K) [image/vnd.microsoft.icon]
Saving to: ‘roland.ico’

roland.ico    100%   1.12K  --.-KB/s    in 0s

2026-02-04 13:27:57 (41.9 MB/s) - ‘roland.ico’ saved [1150/1150]

u0_a150@rhea:~/.../blog/static$ wget https://roland.iwasno.net/9atom-style.css
--2026-02-04 13:28:12--  https://roland.iwasno.net/9atom-style.css
Resolving roland.iwasno.net (roland.iwasno.net)... 5.9.120.57, 2a01:4f8:162:7019::2
Connecting to roland.iwasno.net (roland.iwasno.net)|5.9.120.57|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 752 [text/css]
Saving to: ‘9atom-style.css’

9atom-style.c 100%     752  --.-KB/s    in 0s

2026-02-04 13:28:12 (68.8 MB/s) - ‘9atom-style.css’ saved [752/752]

u0_a150@rhea:~/.../blog/static$

I wanted to move ~/p/gio.org to drafts, but lost it.

7. 2026-02-05

Recovered gio.org, I had moved it to the file blog/draft instead of the directory blog/drafts/. I also changed the name of the main page from index.html to blog.html so it can coexist with my current home page.

8. 2026-02-06

Directory structure

u0_a150@rhea:~/p/j0rat$ tree
.
├── 2024-01-22-TryOrgStaticBlog.txt
├── README-GitLab.md
├── README-template.md
├── README.md
├── README.md-rhea
├── blog
│   ├── archive.html
│   ├── blog-notes.html
│   ├── blog.html
│   ├── draft.html
│   ├── drafts
│   │   ├── draft.org
│   │   └── gio.org
│   ├── gio.html
│   ├── j0rat.html
│   ├── org
│   │   ├── blog-notes.org
│   │   └── j0rat.org
│   ├── plot -> ../plot/
│   ├── rss.xml
│   ├── rss.xml~
│   ├── static -> ../static/
│   ├── tag-mathematics.html
│   ├── tag-meta.html
│   ├── tags.html
├── blog-settings.el
├── blog-settings.el~
├── j0rat-plain.html
├── plot
│   ├── j0rat-01.png
│   └── j0rat-02.png
└── static
    ├── 9atom-style.css
    ├── header.html
    ├── old-postamble.html
    ├── preamble.html
    └── roland.ico

8 directories, 39 files
u0_a150@rhea:~/p/j0rat$

Directories used by org-static-blog: the variables org-static-blog-suffix have the following values:

abb	suffix	value
pu	publish-directory	~/p/j0rat/blog
po	posts-directory	~/p/j0rat/blog/org
dr	drafts-directory	~/p/j0rat/blog/drafts

The references in blog.html below are annotated with the abbreviations from column "abb" or "hc" for URLs hard-coded in org-static-blog.el and "ud" fur URLs defined by the user.

14 matches in 11 lines for "href=\|img=" in buffer: blog.html
pu  7:      href="~/p/j0rat/blog/rss.xml"
hc 12:<link href= "static/style.css" rel="stylesheet" type="text/css" />
hc 13:<link href="static/favicon.ico" rel="icon" />
pu 21:<h2 class="post-title"><a href="~/p/j0rat/blog/j0rat.html">rational minimax approximation for J₀(x)</a></h2><div class="post-date">01 Feb 2026</div><p>
ud 23:<a href="https://dlmf.nist.gov/3.11#iii">https://dlmf.nist.gov/3.11#iii</a> describes a rational minimax
ud 28:<a href="https://dlmf.nist.gov/10.3">https://dlmf.nist.gov/10.3</a> confirms that. I shall look at the
pu pu 30:</p>(...)<div class="taglist"><a href="~/p/j0rat/blog/tags.html">Tags</a>: <a href="~/p/j0rat/blog/tag-mathematics.html">mathematics</a> </div><h2 class="post-title"><a href="~/p/j0rat/blog/blog-notes.html">starting a blog</a></h2><div class="post-date">31 Jan 2026</div><p>
ud 32:reading [[<a href="https://dou-meishi.github.io/org-blog/2024-01-22-TryOrgStaticBlog/notes.html#org811a1c5">https://dou-meishi.github.io/org-blog/2024-01-22-TryOrgStaticBlog/notes.html#org811a1c5</a> <i>insert URLs</i> I started to experiment.
pu 33:</p>(...)<div class="taglist"><a href="~/p/j0rat/blog/tags.html">Tags</a>: <a href="~/p/j0rat/blog/tag-meta.html">meta</a> </div><div id="archive">
pu 34:<a href="~/p/j0rat/blog/archive.html">Other posts</a>
ud 37:<div id="postamble" class="status">Created by <a href="https://github.com/bastibe/org-static-blog/">Org Static Blog</a>, Emacs GNU Emacs 30.2 (build 1, aarch64-unknown-linux-android)

9. 2026-02-09

tried to use relative path for org-static-blog-publish-directory, org-static-blog-posts-directory, org-static-blog-drafts-directory, this seems to produce sensible references.

10. 2026-02-10

copied the files to iwasno.net

u0_a150@rhea:~/p/j0rat/blog$ ssh rlk@iwasno.net mkdir /var/www/roland.iwasno.net/blog
u0_a150@rhea:~/p/j0rat/blog$ rsync *.html rss.xml static/* rlk@iwasno.net:/var/www/roland.iwasno.net/blog/
u0_a150@rhea:~/p/j0rat/blog$

but this failed to create the subdirectory static and the files were not readable by www-data.

11. 2026-02-11

11.1. TODO `[2/9]` next steps

[X] write "about" and
[ ] "starting-a-blog" pages.
[ ] math rendering
[X] add link in quote from DLMF https://dlmf.nist.gov/10.2#ii
[ ] make plots scalable, the PNG plot is too large for a phone display
[ ] start a feature check list
[ ] adjust date format
[ ] improve validation links
[ ] shorten Emacs version information

12. 2026-02-19

12.1. Progress

I did not log my work since 2026-02-11, but now I have a menu and found an error in my calculation of the rational approximation to J₀(x).

13. 2026-02-25

I have implemented a two color scheme, which I will adjust to get a better approximation to Plan 9's acme

https://wiki.selfhtml.org/wiki/Selektoren_in_CSS/Einstieg#Klassen-Selektor

13.0.1. acme colors

acme.png (copied to nc/zmisc) was taken from File:Plan_9_from_Bell_Labs_(with_acme).png

light blue in the command menus (r,g,b) = 168,255,255 = 0xA8, 0xFF, 0xFF darker blue in the border 159,239,239 light yellow I could not seem to pick the color in IrfanView, but using the right mouse button revealed 255,255,168 lilac in the first cell of the second row 133,136,207

acme-color.el contains the following:

;; Acme-inspired colors, from http://www.lispforum.com/viewtopic.php?f=15&p=818#p773
;; Use list-colors-display and a real acme (or
;; http://www.cs.bell-labs.com/plan9/img/screenshot.gif)
;; for fine tuning.
;; https://swtch.com/jsamterm/ uses #e9ffff for blue and #ffffe9 for yellow

but actually uses

(set-face-background 'default "lightyellow1")
(set-face-background 'region "lemonchiffon2")

14. 2026-02-27

[DLMF] NIST Digital Library of Mathematical Functions. https://dlmf.nist.gov/, Release 1.2.5 of 2025-12-15. F. W. J. Olver, A. B. Olde Daalhuis, D. W. Lozier, B. I. Schneider, R. F. Boisvert, C. W. Clark, B. R. Miller, B. V. Saunders, H. S. Cohl, and M. A. McClain, eds.

https://jigsaw.w3.org/css-validator/validator?uri=https%3A%2F%2Froland.iwasno.net%2Fblog%2Fabout.html

15. What does this mean?

When publishing, the following message was shown:

Using vacuous schema

Last changed: 2026-03-05T20:37:22-CET.

Footnotes:

for example, the blogs of Inspiring blogs https://roland.iwasno.net/links/?searchtags=design, but there are others, e.g. from Tim Bradshaw, Sandra Snan and Karl Voit (insert URLs)