Xah Emacs Blog

emacs bug. if u have a lang with comment syntax such as

/▮/ comment
/▮* comment */
(▮* comment *)

and cursor is on after the 1st char in the line, then you do (nth 4 (syntax-ppss)) it returns nil.

however, if cursor is at

/* comment *▮/
(* comment *▮)

it return true.

• here's the story.
• in xah-fly-keys , there is this command
• xah-delete-backward-char-or-bracket-text.
• however, when in a programing language with this comment syntax
• (* comment *)▮
• it skips the comment and delet some other text in buffer.
• to fix this, took 5 hours today.

• Emacs: Run Elisp Code When File Opens (Persistent Highlight)
• Emacs: Bold, Underline, Color Texts (Persistent Highlight)

• Emacs Lisp: Determine Cursor is Inside String/Comment

major re-organization Xah Emacs Tutorial

now

• Lisp Basics → lisp language stuff
• Practical Emacs Lisp ⭐ → emacs related lisp stuff
• Emacs Lisp Examples
• Emacs Lisp How to Write Major Mode

more updates, minor or major:

• Emacs Lisp: Write a Major Mode for Syntax Coloring
• Emacs Lisp: Font Lock Mode Basics

• Emacs Lisp Basics
• Emacs Lisp: Boolean (true/false) (t/nil)
• Emacs Lisp: Convert Int/Float/String
• Emacs Lisp: Format String

and lots other pages.

massive reorg

• Emacs Lisp Basics
• Arithmetic
• Boolean
• Variable
• Block of Expression
• If Then Else
• Loop
• Function

• how many items can emacs lisp completing-read take

• xtodo review Emacs Lisp: How to Write Keyword Completion Command

• Emacs: Organize Init File
• Emacs: Init File Tutorial

all code update

• Emacs: xah-get-thing.el
• Emacs Lisp: Syntax Color Source Code in HTML
• Emacs: Convert File Line Ending
• Emacs: Insert Date Time
• Emacs: Compile TypeScript File
• Emacs: Change Brackets/Quotes
• Emacs: Dired Sort File by Time, Size

• Emacs Lisp: Documentation Lookup
• Emacs: Show Variable Value, List Variables

• Emacs: Set Default Browser

• new url Emacs: Xah Fly Keys

set-transient-map clear-transient-map bug

• Emacs Lisp: Sequence Functions
• Emacs Lisp: Sequence Type
• Emacs Lisp: Test Equality
• Emacs Lisp: Symbol

new version of xah emacs tutorial is generated. buy it! Sending update in this week.

Buy Xah Emacs Tutorial

• Emacs: Run Current File
• Emacs Lisp: Get User Input

• new Emacs: Smart Key

updates:

• Emacs: Xah Fly Keys Customization
• Emacs: Abbrev Mode by Commands
• Emacs: Abbrev Mode by Lisp Code
• Emacs: icomplete mode, fido mode
• Emacs: How to Bind Super Hyper Keys

new and updates

• xah talk show 2022-06-08 emacs lisp tutorial, write command to change space to newline
• Emacs: Spaces to New Lines

other updates

• Emacs: auto-save (filename with #hashtag#)
• Emacs: Turn Off Emacs Auto Backup~
• Emacs: Install Package from ELPA
• How to Install Emacs Package Manually
• Emacs: Byte Compile Elisp Files
• Emacs: Delete Emacs Backup Files
• Emacs: Set Default Major Mode

• new Emacs: How to Create Your Own Theme
• updated Emacs: Switch Buffer
• 2022-06-07 xtodo cperl mode freezes emacs 28.1 Emacs: perl-mode vs cperl-mode

• Emacs Lisp: Bionic Reading

updates

• Emacs: Quote Lines
• now free Emacs: xah-get-thing.el
• Emacs Basics
• Emacs: Abbrev Mode by Lisp Code
• Emacs: Interactive Abbrev
• Emacs: Make Buffer Flow Side-by-Side

• Emacs Lisp: Property List
• Emacs Lisp: Symbol Property List
• Emacs Lisp: Text Properties

• xah talk show 2022-05-28 write a emacs lisp script to count elisp function usage frequency
• Emacs Lisp: Hash Table

• Emacs Command Frequency Statistics
• Emacs Lisp Function Frequency
• List of Emacs Hooks
• List of Emacs Lisp Variables

updates

• Emacs Lisp Basics
• Emacs Lisp: How to Write a Command
• Emacs Lisp: Interactive Form
• Emacs Lisp: Get User Input
• Emacs Lisp: Functions on Line

• Emacs Lisp: Create Sitemap
• Emacs: Quote Lines

updated.

• Emacs Lisp: Function Parameters
• Emacs Lisp: throw, catch, exit function
• Emacs Lisp: Function Doc String Markup
• Emacs Lisp: What's Function

• Emacs: Set Color Theme
• Emacs: Theme Gallery

xah talk show 2022-05-21 emacs lisp coding, bionic reading command

updates

• Emacs Lisp: Major Mode Names
• Emacs Lisp: load, load-file, autoload, require
• Emacs Lisp: provide, require, features
• Emacs Lisp: Symbol

• Emacs: Convert Chinese/Japanese Punctuations Full-Width/Half-Width
• Emacs: Convert Full-Width/Half-Width Characters (new page)

great to know. powershell does not choke by emacs Formfeed char

• Emacs Form Feed ^L
• Emacs: Show Form Feed as Line
• Emacs: Make Form Feed Character Obsolete

• xah talk show 2022-05-16 emacs, most efficient way to toggle letter case, upcase sentences, reformat lines, problems of fill-region

new and updates

• Emacs Lisp: Determine OS, Emacs Version, Machine Host Name. minor update

• Emacs Lisp: Text Editing Functions

• Emacs: Show Variable Value, List Variables
• Emacs: Search Documentation, List Commands

• Emacs: Font Setup
• Emacs: What is Major Mode
• Emacs: What is Hook

xah talk show 2022-05-12 emacs, most efficient ways to open file

and updated:

• Emacs: Bookmark
• Emacs: Open Last Closed File
• Emacs: Open Recently Opened File

Xah Talk Show 2022-05-11 How I Got into LISP, Should You Learn Wolfram Language, Math Plane Curves

updates

• Emacs Lisp: Run Emacs Lisp Code in Shell
• Download Emacs for Windows/Mac
• Emacs on MacOS Cannot Access File

xtodo

• emacs 28 so-long-mode. fantastic. (also needs to fix all my pages mentioning long lines problem.)

Famous Emacs Users new addition.

• Emacs in Microsoft Windows FAQ
• Emacs Basics
• Emacs Keys Basics
• Emacs: Setup Standard Copy Cut Paste Keys
• Emacs Basics Tips
• Emacs: Spell Checking
• Emacs: Refresh File Automatically
• Emacs: Environment Variables in Emacs

updates.

• Emacs Lisp: Symbol
• Emacs Lisp: Function Parameters
• Emacs Lisp: Test Equality
• Emacs Lisp: Documentation Lookup
• Emacs: Unicode Tutorial
• Emacs: Auto Close Brackets, electric-pair-mode

xah talk show 2022-04-25 emacs lisp, write command to delete cache files, Language Server Protocol Kills Emacs

xah-fly-keys now on nonGnu ELPA. Emacs: Xah Fly Keys

14 years old bug, now fixed in emacs 29. describe-mode. thanks to Lars Ingebrigtsen

• emacs bug 575, add link to info doc in describe mode
• emacs bug 2473, usability issues on emacs's describe-mode

following xtodo todo, clean up the index mess:

• Emacs: Make elisp-index-search use Current Symbol
• Emacs Misc Index

Richard Stallman, High-tech Prankster new photos. from [Don Hopkins][ https://en.wikipedia.org/wiki/Don_Hopkins ]

• xtodo work in progress Emacs 28.1 Features (released 2022-04)

• xah talk show 2022-04-09 emacs 28, icomplete, fido, replace ido, and smex

emacs 28 added the 'emoji group of characters.

• Emacs: Font Setup

emacs 28 now support flex match for name completion for all commands that use minibuffer prompt. major update:

• Emacs: icomplete mode, fido mode
• Emacs: icomplete vs ido mode

• new page Emacs Version History

emac 28, am extremely IMPRESSED. Best upgrade, most user level features in past 10 years, and the “NEWS” file is now READABLE. eg emacs now has proper undo/redo. All packages trying to fix it in past 20 years are done for. Review/livestream in coming weeks.

• Xah Emacs Tutorial Search 🔍

xah talk show 2022-03-26 write a search engine for my site. emacs lisp + JavaScript coding

• Emacs: Hippie Expand
• Emacs: Hippie Expand Setup

xah lee emacs packages on melpa stats xtodo need to get other stat to that page.

Major update. Lots new pages. some parts are still work in progress xtodo

• Emacs Init Setup

• Emacs: Setup Standard Copy Cut Paste Keys
• Emacs: Type Overwrite Selection
• Emacs: Set Default File Encoding
• Emacs: Setup Down Arrow Key for Screen Line or Logical Line
• Emacs: Setup Soft-Wrap Lines
• Emacs: Hard-Wrap Lines

• Emacs: Auto Close Brackets, electric-pair-mode
• Emacs: Delete Emacs Backup Files

minor updates.

• Best Keyboards for Emacs
• Kinesis/Ergodox Layout for Xah Fly Keys

• updated Emacs: Mouse Config

Emacs: Find Replace in Pure Elisp, xah-find.el
now much faster

3 new functions.

• xah-dired-rotate-img-180
• xah-dired-rotate-img-left
• xah-dired-rotate-img-right

Emacs: xah-dired.el
buy it.

update or new

• Emacs Keys Basics
• Emacs Principles, Command and Keys
• Xah HTML Mode Tutorial

Emacs: Xah HTML Mode
new video

how to get dired to display file size with seperators e.g. 123,456,789.

;; 2022-03-30 original, in lisp/ls-lisp.el
(defun ls-lisp-format-file-size (file-size human-readable)
  (if (not human-readable)
      (format (if (floatp file-size)
		  ls-lisp-filesize-f-fmt
		ls-lisp-filesize-d-fmt)
	      file-size)
    (format " %6s" (file-size-human-readable file-size))))

;; (defun ls-lisp-format-file-size (FileSize HumanReadable)
;;   (if HumanReadable
;;       (format " %6s" (file-size-human-readable FileSize))
;;     (format (if (floatp FileSize)
;;                 ls-lisp-filesize-f-fmt
;;               ls-lisp-filesize-d-fmt)
;;             FileSize)))


;; 2022-02-22 from Jacob L
;; (defun ls-lisp-format-file-size (FileSize HumanReadable)
;;   (if HumanReadable
;;       (format " %6s" (file-size-human-readable FileSize))
;;     (concat
;;      " "
;;      (let*
;;          ((xInput (format (if (floatp FileSize)
;;                               ls-lisp-filesize-f-fmt
;;                             ls-lisp-filesize-d-fmt)
;;                           FileSize))
;;           (xNumber (substring xInput 1))
;;           (xDigits (length xNumber))
;;           (xSepRequired (/ xDigits 3)))
;;        (dotimes (i xSepRequired xNumber)
;;          (let ((xSepPos (- xDigits (* (+ 1 i) 3))))
;;            (setq
;;             xNumber
;;             (concat (substring xNumber 0 xSepPos)
;;                     (if (string-equal " " (substring xNumber (- xSepPos 1) xSepPos))
;;                         " "
;;                       "_")
;;                     (substring xNumber xSepPos)))))))))

(defun jacob-format-filesize-with-seperator (input seperator)
  (letrec ((digits (split-string input "" t))
           (go (lambda (l c nl)
                 (if (null l)
                     nl
                   (funcall
                    go (cdr l) (+ c 1)
                    (cons (car l)
                          (cons (if (and (= (% c 3) 0)
                                         (not (null nl)))
                                    (if (string-equal " " (car l))
                                        " "
                                      seperator))
                                nl)))))))
    (mapconcat 'identity
               (funcall go (reverse digits) 0 nil)
               "")))

(defun ls-lisp-format-file-size (file-size human-readable)
  (if (not human-readable)
      (format " %s"
              (jacob-format-filesize-with-seperator
               (format (if (floatp file-size)
                           ls-lisp-filesize-f-fmt
                         ls-lisp-filesize-d-fmt)
                       file-size)
               ","))
    (format " %6s" (file-size-human-readable file-size))))

;; ssss---------------------------------------------------

(defun xah-format-int (Int)
  "add _ every 3 digits.
version 2022-03-30"
  (interactive)
  (let* ((xDigits (mapcar
                   'identity
                   (number-to-string Int)))
         (xLen (length xDigits))
         (xResultList nil)
         (xTimes (/ xLen 3))
         (xStart (mod xLen 3))
         (xEnd (+ xStart xLen)))
    (while (<= xStart xEnd)
      (if (= (mod xStart 3) 0)
          (push 95 xResultList)
        (progn
          (push (pop xDigits) xResultList)
          (setq xStart (1+ xStart)))))
    (mapconcat 'char-to-string xResultList ""))
  ;;
  )

(mapconcat 'number-to-string '(3 4 5) "_")

(xah-format-int 123)

emacs bug 1111, fixed after 13 years

emacs_bug_1111_describe_keys_key_notation.txt

• Emacs Bugs One Decade Delay

• Emacs: Xah CSS Mode

misc updates

• Emacs Lisp: Overlay Highlighting
• Emacs: Indentation Commands
• Emacs: Tab/Indent Setup
• Emacs: Make Whitespaces Visible
• Emacs: Name Completion

Major rework on emacs lisp doc popup. Clear cache and reload to check. Shift+Ctrl+r in chrome. ⌥ option+⌘ command+e in safari.

major rewrite:

• Emacs Lisp: Read File
• Emacs Lisp: Write File

minor updates:

• Emacs: What is Major Mode
• Emacs: What is Minor Mode
• Emacs: Init File Tutorial
• Emacs: Save Cursor Position
• Emacs: Show Line Numbers

Emacs Lisp: Association List
more update.

Xah Talk Show 2022-01-22 emacs lisp coding narrow-to-region, sort-lines, hilight-unicode, emacs vs xemacs

Emacs: Convert File Line Ending
more efficient code

updates

• Emacs: Xah Fly Keys Mode Status Customization
• Emacs: Font Setup

Emacs Lisp: Get Text Block
improved code.

xah talk show 2022-01-20 emacs lisp coding plus tutorial, xah-add-space-after-comma

Emacs: Xah Fly Keys Customization Major update. Still working on it.

xah packages. Added lots features. Minor and major updates. Buy them.

• Emacs: Lookup Web, xah-lookup.el
• Emacs: Find Replace in Pure Elisp, xah-find.el
• Emacs: Xah CSS Mode

Download Emacs for Windows/Mac
added download emacs for Android. thanks to Infu.

Emacs: Xah Fly Keys . Added neo2 layout to the svg diagram. Thanks to p1umps.