pages tagged emacs

installing and configuring emacs

Tue, 16 May 2017 23:59:39 +0000

Emacs modes

name	instruction	description	type
`follow-mode`	split a frame to two vertical windows that show the same buffer by `C`-`x` `3`, then `M`-`x` `follow-mode`	edit parts of a long file that are vertically far apart	editing
`shell`	`M`-`x` `shell`	run a shell through an Emacs buffer	software
`whitespace-mode`	`M`-`x` `whitespace-mode`	display various kinds of whitespace characters	viewing
`markdown-mode`	`M`-`x` `markdown-mode`	for viewing and editting files using markdown markup language	viewing, editting
`yasnippet`	enter different mode, e.g. `xml-mode`, `lisp-mode`, etc., start typing the beginning of code snippets, and press `Tab` to autocomplete the rest	for quickly entering code snippets in different modes	editting

Direct data download

Emacs packages

`company`	Modular text completion framework.	viewing, editting
`flycheck`	On-the-fly syntax checking.	editting
`helm`	Helm is an Emacs incremental and narrowing framework.	?
`use-package`	A use-package declaration for simplifying your .emacs.	configuration
`which-key`	Display available keybindings in popup.	UI
`yasnippet`	Yet another snippet extension for Emacs.	Editting

Direct data download

References

External links

key bindings of emacs

Tue, 16 May 2017 23:59:39 +0000

Types of key bindings

navigate in a buffer
edit a buffer
query a buffer
manage buffers, frames, and windows
manage commands

Key bindings I frequently use

key binding	command	description	type	comment
`C`-`a`		move to the beginning of line	navigate
`C`-`e`		move to the end of line	navigate
`M`-`>`		move to the bottom of the buffer	navigate
`M`-`<`		move to the top of the buffer	navigate
	`goto-line`	move to a certain line	navigate
`M`-`f`		move forward to next word	navigate
`M`-`b`		move backward to previous word	navigate
`C`-`v`		move to the next screen of the buffer	navigate
`M`-`v`		move to the previous screen of the buffer	navigate
`C`-`x` `o`		move curser to different windows		navigate
`C`-`x` `b`		switching between open buffers in current frame	navigate
`C`-`x` `C`-`b`		list open buffers	navigate
`C`-`x` `r` `l`		list bookmarks	navigate
`C`-`x` `r` `m`		add a bookmark for the current buffer	navigate
`C`-`x` `8` `Enter`		insert a Unicode character by its Unicode name, e.g. "em dash" or hexidecimal number, e.g. "0x2E3B"	edit
`C`-`x` `r` `t` `xxx`	`string-rectangle`	enter `xxx` on multiple lines in a rectangle area	edit	the rectangle area can be defined/selected by `M`-`@`
`M`-`;`	`comment-dwin`	comment multiple lines	edit
`C`-`_` or `C`-`x` `u`		undo	edit
`C`-`y`		yank, reinsert the most recent killed text	edit	the kill ring
`C`-`u` `3` `C`-`y`		yank, reinsert the third most recent killed text	edit
`C`-`k`		delete characters after cursur of the current line	edit
`C`-`d`		delete the next characters after cursur	edit
`C`-`x` `i`		insert content of another file	edit
`C`-`@`	`set-mark-command`	set the mark where the point is	edit
`M`-`%`	`query-replace`	Query replace	edit
`C`-`M`-`%`	`query-replace-regexp`	Query replace regexp	edit
`C`-`u` `C`-`x` `Tab`	`?`	indent a block of text rightward by a tab	edit
`C`-`x` `C`-`i`	`?`	indent a block of text rightward by a whitespace	edit	To select a block of text, move cursor to the front, `C`-`Space` to activate the selection, then move the cursor to the end, `C`-`Space` to end the selection.
`C`-`u` `5` `C`-`x` `Tab`	`?`	indent a block of text rightward by 5 spaces	edit
`C`-`u` `5` `C`-`x` `C`-`i`	`?`	indent a block of text rightward by 5 spaces	edit
`M`-`l`		convert the following word to lower case	edit
`M`-`Tab` (with cursor near an English word)		check dictionary for alternative spellings	edit
`M`-`q` (with a highlight region)	`fill-paragraph`	automatically line wraps a pragraph of text	edit
`C`-`M`-`@`	`mark-sexp`	undo	edit	1) move cursor to the beginning of a block of text by mouse or up arrow key 2) `C`-`M`-`@` to mark the beginning of the block 3) move cursor to the end of the block 4) operate on the block, e.g. indent rightward by 1 whitespace with `C`-`x` `C`-`i`, or indent rightward by 4 whitespaces with `C`-`u` -4 `C`-`x` `C`-`i`
`C`-`s`	`isearch-forward`	I-search	query
`C`-`r`	`isearch-backward`	I-search backward	query
`C`-`M`-`s`	`isearch-forward-regexp`	Regexp I-search	query
`C`-`M`-`r`	`isearch-backward-regexp`	Regexp I-search backward	query
`C`-`x` `C`-`b`	`list-buffers`	list open buffers	manage buffer
`C`-`r`	`recentf-open-files`	list recently opened files	manage buffer
`C`-`x` `C`-`f`	`find-file`	load file to current buffer	manage buffer
`C`-`x` `C`-`w`		write current buffer to a file	manage buffer
`C`-`x` `C`-`v` `Ret`	`find-another-file`	load another file to current buffer, by default reload the same file	manage buffer
	`revert-buffer`	get rid of extensive changes made to current buffer and revert back to	manage buffer	"Reverting a buffer." GNU Emacs Manual.
`C`-`x` `b`	`switch-to-buffer`	switch to buffer	manage buffer
`C`-`x` `C`-`w`		save buffer to another file	manage buffer
`C`-`x` `C`-`+`		increase font size	manage buffer
`C`-`x` `C`-`+`		decrease font size	manage buffer
`C`-`x` `b` arrow key		select buffer to load into current frame	manage buffer
`C`-`x` `0`		close current window	manage frame/window
`C`-`x` `0` `5`		close current frame	manage frame/window
`C`-`x` `3`		split frame vertically	manage frame/window
`C`-`x` `2`		split frame horizontally	manage frame/window
`C`-`x` `5` `2`		open a new frame	manage frame/window
`C`-`x` `o`	`other-window`	move cursor to other window in the current frame	manage frame/window
`C`-`q`		cancel current command	manage commands
`C`-`l` `C`-`\` `chinese-punct`		type Chinese punctuation	misc	Type `C`-`l` `C`-`\` to turn on/off the input method
`C`-`x` `C`-`h`		get help text in another buffer	misc
`M`-`Tab`		find possible word completion	misc

Direct data download

Modifier keys

C-: Ctrl
M-: Meta, M, which is usually the Alt key on most keyboards, and possibly Esc on Mac computers
s-: Super, s, which can be typed in with C-x @ s
H-: Hyper, H, which can be typed in with C-x @ h
A-: Alt, A, which can be typed in with C-x @ a

References

GNU Emacs Manual.

Removing newline characters

Tue, 16 May 2017 23:59:39 +0000

Meng Lu, 2013-7-6

Suppose you want to remove newlines in between the Chinese characters:

南海少年遊俠客，    
詩成嘯傲凌滄州，  
曾因酒醉鞭名馬，
生怕情深累美人。

-- note that the 1st and 2nd Chinese comma ， actually have two or more white spaces following them -- and change it to a single line

南海少年遊俠客，詩成嘯傲凌滄州，曾因酒醉鞭名馬，生怕情深累美人。

One way to do this is using Emacs.

Use `query-replace-regexp`

Press M-x, and type query-replace-regexp, or as a shortcut C-M-%;

Type regexp to match:

\([[:nonascii:\]]\) *
 *\([[:nonascii:\]]\)

Note the line break in the regexp need to be typed into the Emacs minibuffer with C-q C-j.

Type regexp to substitute:

\1\2

This means the white space character(s) (if any) and newline character between non-ASCII characters will be removed in the substituted version, so the result is the character on the first line followed by that on the second line.

Use `fill-paragraph`

Set fill-column variable, which controls how wide a line of text can go before line-wrapping to a very large value for the current buffer: C-x f, 10000000
Highlight the paragraph you'd like to modify: move cursor to the beginning, hold Shift down and move up and down arrow to extend and decrease the selection;
Press M-x, and type fill-paragraph.

This should remove all newline characters in the text. Interestingly, if there are multiple white space characters at the end of lines before the new line character, it will keep one of them:

南海少年遊俠客， 詩成嘯傲凌滄州， 曾因酒醉鞭名馬，生怕情深累美人。

Note there is an additional white space after the 1st and the 2nd ，.

The single white space character is actually still redundant, that can be corrected by

M-x query-replace-regexp
， *
，

How to switch font and theme in Emacs

Tue, 16 May 2017 23:59:39 +0000

In my .emacs, I set "Source Code Pro" as my default font and solarized-dark as my default theme. But occasionally, I'd like to switch the theme and font in the current Emacs frame. After some Internet research, I find the commands to do this:

to swith theme to solarized-light, do

M-x, load-theme, Enter, solarized-light

In Emacs 24+, one can also interactively set font using mouse by

M-x, mouse-set-font, and selecting font faimily, typeface, size in the Fonts pop-up window.

to swith font, do

M-x, set-frame-font, Enter, Space (trigger auto-completition to look for candidates, and use Up, Down to switch font), Enter

References

Installing and configuring input methods on Ubuntu Linux

Mon, 23 Mar 2015 03:24:46 +0000

This is a note on installing and configuring input methods for Chinese, English, and Japanese text on Ubuntu Linux.

Updated: 2015-3-22, Ubuntu Linux 14.04

Install and configure Sougou Pinyin for Chinese, Mocz for Japanese.

Install packages

sudo apt-get install im-switch fcitx fcitx-mozc fcitx-anthy

fcitx: Flexible Input Method Framework
fcitx-mozc: Mozc engine for fcitx - Client of the Mozc input method
Mozc: https://code.google.com/p/mozc/

Install Sougou Pinyin.

Configure Emacs to use fcitx

In order to use fcitx input methods in Emacs, the following configuration needs to be placed in $HOME/.bashrc:

export LC_CTYPE="zh_CN.UTF-8"

References

http://www.cnblogs.com/pylemon/archive/2012/01/05/2312682.html
http://moritzmolch.com/1453

pages tagged emacs

installing and configuring emacs

Emacs modes

Emacs packages

References

Related pages

External links

key bindings of emacs

Types of key bindings

Key bindings I frequently use

Modifier keys

References

Removing newline characters

Use query-replace-regexp

Use fill-paragraph

How to switch font and theme in Emacs

References

Installing and configuring input methods on Ubuntu Linux

Install packages

Configure Emacs to use fcitx

References

Use `query-replace-regexp`

Use `fill-paragraph`