The Things' Engine – Blog

1. Create a emacs lisp script, HelloWorld.el

   (message "Hello Elisp World!")
   

2. Run a elisp script on a MacOS from the command line

   /Applications/Emacs.app/Contents/MacOS/Emacs --script HelloWorld.el
   

Most useful options for running emacs lisp as a script:

• "–no-init-file" or "-q"
• "–no-site-file"
• "–batch"
• "–load= path" or "-l path"
• "–script path"

Two more things:

1. What is site-start.el The site-start.el is a int file for site-wide running of emacs, a init file for all users fo the installed emacs. On MacOS, The path is "/Applications/Emacs.app/Contents/Resources/site-lisp".
2. How to prepare your emacs lisp scrip to run in batch mode
   • self-contained
   • load all needed libraies properly

   • set the necessary load path set in the script, such as follows:

     (add-to-list 'load-path lib_path)
     

While exploring difference, never lose sight of sameness for it is sameness that brings us together. – John Briggs

A long journey begins with the first step – Lao Tzu

The macros in Org allow you to add text or code to an Org document that will be expanded during export: the text between the 3 pairs of accolades is expanded so that readers can see it in the exported versions of the document.

It can be used to construct complex HTML or LaTeX code.

#+MACRO: color @@html:<span style="color: $1">$2</span>@@
{{{color(blue, This text is colored in blue.)}}}
{{{color(red, This other text is in red.)}}}

This text is colored in blue. This other text is in red.

• Hexagrams
  “✡” “⎈” “✽” “✲” “✱” “✻” “✼” “✽” “✾” “✿” “❀” “❁” “❂” “❃” “❄” “❅” “❆” “❇”
• Circles
  “○” “☉” “◎” “◉” “○” “◌” “◎” “●” “◦” “◯” “⚪” “⚫” “⚬” “❍” “￮” “⊙” “⊚” “⊛” “∙” “∘”
• Special Circles
  “◐” “◑” “◒” “◓” “◴” “◵” “◶” “◷” “⚆” “⚇” “⚈” “⚉” “♁” “⊖” “⊗” “⊘”
• Crosses
  “✙” “♱” “♰” “☥” “✞” “✟” “✝” “†” “✠” “✚” “✜” “✛” “✢” “✣” “✤” “✥”
• Poker Sybmols
  “♠” “♣” “♥” “♦” “♤” “♧” “♡” “♢”
• Yinyang
  “☯” “☰” “☱” “☲” “☳” “☴” “☵” “☶” “☷”
• Special Symbols
  “☀” “♼” “☼” “☾” “☽” “☣” “§” “¶” “‡” “※” “✕” “△” “◇” “▶” “◀” “◈”

1: ;; use org-bullets-mode for utf8 symbols as org bullets
2: (require 'org-bullets)
3: ;; make available "org-bullet-face" such that I can control the font size individually
4: (setq org-bullets-face-name (quote org-bullet-face))
5: (add-hook 'org-mode-hook (lambda () (org-bullets-mode 1)))
6: (setq org-bullets-bullet-list '("✙" "♱" "♰" "☥" "✞" "✟" "✝" "†" "✠" "✚" "✜" "✛" "✢" "✣" "✤" "✥"))

It is how to use Emacs Lisp as formulas in Org tables. Example 1: manipulate cells. Here is a simple table:

Now type C-c } to display the table's coordinates.

1: '(concat $1 "." $2 "@emacs.edu")

Now copy this formula, type C-c = in the bottom right field to insert a column formula2 and copy the formula here. Hitting RET will immediately insert the result in this field (Even.Yellow@emacs.edu) and add the #+TBLFM line (#+TBLFM: $3='(concat $1 "." $2 "@abc.edu")) at the bottom of the table.

Paragraphs are separated by at least one empty line. If you need to enforce a line break within a paragraph, use ‘\\’ at the end of a line.

To preserve the line breaks, indentation and blank lines in a region, but otherwise use normal formatting, you can use this construct, which can also be used to format poetry.

Great clouds overhead
Tiny black birds rise and fall
Snow covers Emacs

   —AlexSchroeder

When quoting a passage from another document, it is customary to format this as a paragraph that is indented on both the left and the right margin. You can include quotations in Org documents like this:

Everything should be made as simple as possible, but not any simpler —Albert Einstein

If you would like to center some text, do it like this:

Valign.el

This package provides visual alignment for Org and Markdown tables on GUI Emacs. It can properly align tables containing variable-pitch font, CJK characters and images. Meanwhile, the text-based alignment generated by Org mode (or Markdown mode) is left untouched.

To use this package, load it and add valign-mode to org-mode-hook or markdown-mode-hook:

1: (add-hook ’org-mode-hook #’valign-mode)

To simply convert one file from Markdown to Org the following command can be used:

pandoc -f markdown -t org -o newfile.org original-file.markdown

The solution was to export the VoodooPad document to a folder as text (File > Export Document > Export as Text…). Then call pandoc via the find command to convert them all in one go:

$ find . -name \*.txt -type f -exec pandoc  -f markdown -t org -o {}.org {} \; 

for f in `ls *.md`; do 
  pandoc -f markdown -t org -o ${f}.org ${f}; 
done

(defun markdown-convert-buffer-to-org ()
   "Convert the current buffer's content from markdown to orgmode format and save it with the current buffer's file name but with .org extension."
   (interactive)
   (shell-command-on-region (point-min) (point-max)
                            (format "pandoc -f markdown -t org -o %s"
                                    (concat (file-name-sans-extension (buffer-file-name)) ".org"))))

Plan to write an article to talk about "Tables in Emacs with Org-mode"

End is a new beginning – YF Lin