Xah Emacs Blog

hum, now coded Wolfram Language for several months... now i think i revert a lisp opinion, now i maybe embrace lisp symbols over string. problem with lisp symbols is it pollutes the symbol table, and is hard to rid of. Emacs Lisp: Symbol vs String

the difference is: WolframLang uses symbols extensively sans reservation. It's part of the normal way of using the language, due to symbolic term rewriting nature. every math formula, e.g. (x^2 + x y^3)^4 is arbitrary symbols. in lisp, arbitrary symbols are NOT used much.

here's my WolframLang tutorial:

2021-10-28

Emacs: Xah Replace Pairs, xah-replace-pairs.el if you like it, buy it. Support open source coders not working for google.

2021-10-20

betterment in xah-fly-keys

now, C-v is paste in isearch.
xah-open-file-at-cursor now has xah-open-file-at-cursor-pre-hook.
the emacs default C-j is not removed. (it's tied to pressing return, ascii linefeed.)

2021-10-20 thanks to ctietze [https://christiantietze.de/]

2021-10-18

updated. Emacs: Indentation Commands

2021-10-17

run-hook-with-args-until-success

busied half a day writing this today. emacs lisp, making use of this special hook run-hook-with-args-until-success. so that function can have custom behavior.

2021-10-16

Syntax Coloring Problem with Variable

2021-10-15

XahTV 2021-10-15 grep/sed find/replace in WolframLang elisp golang python perl PowerShell

2021-10-14

XahTV 2021-10-12 grep/sed in emacs lisp PowerShell golang python perl

2021-10-12

new feature added. Now can specify a dir min max depth. Emacs: Find Replace in Pure Elisp, xah-find.el

2021-10-12

added. code to walk dir with depth filter. Elisp: Walk Directory

2021-10-05

massive rewrite on ergoemacs-mode, by mattfidler and big contributor wlandry. [2021-10-06 https://github.com/ergoemacs/ergoemacs-mode/issues/505 ]

2021-10-01

Famous Emacs Users added screen of Knuth.

2021-09-30

emacs. the nav panel on the left is now organized. Xah Emacs Commands

2021-09-25

updated:

2021-09-25

Emacs Bugs One Decade Delay

2021-09-24

How to Avoid Emacs Pinky minor update. Repetitive Strain Injury toys moved to RSI Hand Exercise Toys

2021-09-21

Emacs Magit Mode Problem

2021-09-20

Emacs will crash Windows 10 if font size is set to big like 300. Try Alt+x text-scale-adjust then keep pressing =

2021-09-15

XahTV 2021-09-14 Emacs Xah Html Mode, the Most Powerful Html Editor

2021-09-13

Elisp: Font Lock Mode Basics much expanded.

2021-09-04

Elisp Text Processing vs Structured

2021-08-31

Best Unicode Fonts for Programer

2021-08-29

Emacs Lisp Constructs Speed Comparison

2021-08-28

old article, now on hackernews, for the nth time. https://news.ycombinator.com/item?id=28336724

Emacs Modernization: Simple Changes Emacs Should Adopt

2021-08-27

created a index page of xah commands. Xah Emacs Commands

2021-08-27

sigil war 2

The Sigils WAR, Language Design and Coding Convention

2021-08-26

updated.

2021-08-23

elisp save-restriction narrow-to-region scrolls buffer if message

Seems a annoying emacs lisp problem. If you (save-restriction (narrow-to-region p1 p2) ) , but if you print something with (message) that's long or more than 1 line, the buffer scroll position changes. Took 20 minute to pin down this. test code:

(defun xx (p1 p2)
  "DOCSTRING"
  (interactive "r")
  (save-restriction
    (narrow-to-region p1 p2)
    (message "something very long\n or two lines" )))

2021-08-20

Added how to setup xah-fly-keys in doom emacs at Emacs: Xah Fly Keys

2021-08-19

Elisp: Relation of Curor Position to Begin/End of Matching Pairs in Source Code

2021-08-18

2021-08-18 lol. found a gnu elisp code that isn't formatted correctly.

2021-08-16

new Xah HTML Mode

Emacs: Xah HTML Mode

Complete rewrite. Now 4k lines. Some 80 hours work in past weeks.
Managed to add a lot features, and reduced 400 line count.
Changed some 20 function names.
Complete redesign of keybinding. Most are changed.
Now 136 functions.

draft tutorial at Xah HTML Mode Tutorial

More feature to come, possibly more keybinding change.

2021-08-09

code update. Emacs: Cycle Hyphen/Lowline/Space

2021-08-08

Elisp: Repeat Command by Key, set-transient-map

2021-08-05

XahTV 2021-08-03 emacs packages, CSS, command naming bash vs PowerShell, history of Wikipedia

2021-08-02

new screenshots and other updates.

2021-08-01

Currently looking at how gnu emacs does fill-region. Seems very complex. Thinking not to call it. Always call my own instead.

This is the main code. After 1 thousand lines of jumping about:

ok. replaced call of fill-region by a simply replace of newline by space, then replace double space to single.

code updated. xah-reformat-to-sentence-lines at Elisp: Reformat to Sentence Lines

2021-07-31

massive updates. work on elisp whole day.

2021-07-26

lots of emacs live coding in past week. see XahTV 📺

2021-07-25

Elisp: Syntax Table minor update.

2021-07-20

more massive updates. Revamping my tutorial. you buy it!

2021-07-20

site UI change. move xah commands to elisp example.

Those xah commands with a rocket emoji, on the main emacs tutorial navigation panel is move to the elisp examples navigation panel.

so that, the main emacs tutorial index Practical Emacs Tutorial is just teaching you plain gnu emacs.

and if you want the xah commands, get them at Emacs Lisp Examples

2021-07-19

update 2021-07-19.

2021-07-18

updated, big and small.

2021-07-18

Emacs: Mouse Config
major update.

2021-07-14

update.

2021-07-13

GNU Pepe

2021-07-11

Emacs: Select Line, between Quotes, Extend Selection
minor code update

2021-07-08

Emacs: Lookup Web, xah-lookup.el
code update.

2021-07-05

updated.

Xah Emacs Packages
new page, moved here: Emacs: Xah AutoHotkey Mode from [ http://xahlee.info/mswin/emacs_autohotkey_mode.html ]. Might update the package.

2021-07-05

new index page Elisp Misc Technical Essays

2021-07-04

Emacs lisp coding style: let forms

2021-07-04

Emacs: Move Image File minor code update.

2021-07-04

Elisp: Add Period to Line Ends code update. Now don't add to end of html tag.

2021-07-03

Emacs: Show kill-ring
Fixed a bug about image in kill-ring stopping it. Thanks to Christian Tietze (aka DivineDominion)

2021-07-01

Elisp: Function Naming, String Equal

2021-06-30

Emacs: Xah Fly Keys update:

added indent-rigidly key support (qwerty: Space Tab u then j for left and l for right), thanks to Christian Tietze (DivineDominion) pull request #123
xah-open-in-external-app now works in BSD. thx CelestialNebula pull request #124

2021-06-29

Xah Fly Keys Major Mode Key Problem

2021-06-29

minor updates.

2021-06-28

Massive update.

2021-06-27

Emacs Keybinding List

2021-06-27

Emacs: Key Notation <return> vs RET
minor update.

2021-06-27

emacs keybinding saga. xah fly keys. deep in keys.

2021-06-26

Elisp: Create a Hook

2021-06-26

major update.

2021-06-26

XahTV 2021-06-25 Emacs vs Vscode, on Documentation, Java, WolframLang, PowerShell, Golang, Python

2021-06-25

Doom Emacs

2021-06-25

Emacs vs vsCode Memory

2021-06-24

Emacs: Xah Fly Keys
now there is a dedicated navigation panel on the left.

2021-06-24

by the way, important to know is this Emacs vs vim, Compute Keybinding Efficiency

2021-06-23

Emacs: Xah Fly Keys
• added bepo layout, by brabalan. • added 3 more keys to neo2 layout. by sieman. thanks guys.

2021-06-23

New finding. Just tested running a find string program on 10330 html files. It seems, once they are run once (file content loaded to memory), emacs lisp and golang script takes about the same time. 3 seconds.

2021-06-22