ELPA manages packages for Emacs nicely. But, how to upgrade packages installed by ELPA in Emacs? Within Emacs, list all packages by M-x list-packages and it will automatically refresh the archive contents. Then, press U to mark all upgradable packages to be upgraded. Last, press x to perform the new updates. Emacs will then download […]
Alt key seems not work in xterm. Alt is important for Emacs. How to make Alt key work in xterm? Put this in your ~/.Xresources file: XTerm*eightBitInput: false XTerm*eightBitOutput: true Remember to make it take effect after you change the ~/.Xresource without restarting the X server by xrdb -merge ~/.Xresources Answered by Eric Z Ma.
if (p:string list) = [c] then (divide p1 c) showing unbound value c. i want to equalise (if one element in p which is (c:anything)) and use that variable let p = [“ocaml”] let f s = match s with | [c] -> print_endline c | _ -> print_endline “ops” f p It will print: […]
How to replacing a string with another string with newline in Emacs? For example, to replace: good editor with good editor: Emacs What you need is actually to input a newline in Emacs: C-q C-j C-q is for quoted-insert, and C-j is a newline (0xa). Answered by Eric Z Ma.
How to make emacs remember last editing positions in files. It will be convenient next time I open the same file the cursor automatically moves to the position I was last time editing the same file. The behavior seems enabled by default in Vim. How to make Emacs do this? I use the saveplace mode. […]
How to make Emacs highlighting part of lines that go over 80 chars? I use the whitespace mode: ;; `lines-tail`, highlight the part that goes beyond the ;; limit of `whitespace-line-column` (require ‘whitespace) (setq whitespace-style ‘(face empty tabs lines-tail trailing)) (global-whitespace-mode t) More: https://github.com/zma/emacs-config/blob/master/.emacs Answered by Eric Z Ma. Alternatively, you can run highlight-lines-matching-regexp with […]
How to convert between dos and unix file coding for files in Emacs? From Dos to Unix coding: M-x set-buffer-file-coding-system RET undecided-unix or C-x RET f undecided-unix Then save the file (C-x C-s). From Unix to Dos M-x set-buffer-file-coding-system RET undecided-dos or C-x RET f undecided-dos Then save the file (C-x C-s). Answered by Eric […]
How to replace tabs with spaces in Emacs? You can first select the regions of text for converting/replacing, then run M-x untabify to replace all tabs with appropriate number of spaces. There is also a M-x tabify for replacing sequences of spaces to tabs. There are also commands to convert tabs to spaces or vice […]
In Emacs, how to print the name of the current file that I am editing? The built-in function buffer-file-name gives the full path of your file. To get the file name: M-: buffer-file-name Answered by Eric Z Ma.
How to generating TAGS file for Emacs recursively? etags seems not support recursively generating TAGS file. I use ctags instead. It can also generate TAGS file for Emacs with the -e option: ctags -e -R . You can also use etags with find: find ./ -print | xargs etags But I prefer the ctags way. […]
How to map the Win key to another Ctrl on Linux? You can set it in gnome-tweak-tool in Gnome 3 by setting the “Alt/Win key behavior”: Answered by Eric Z Ma.
How to rearrange Alt, Ctrl and Win keys on Linux: Win as Alt and Ctrl/Alt as Ctrl? On Linux, the Win key is seldom used. Mapping the Alt keys which are close to my thumb is damn convenient for Emacs users. Hence, the keyboard at the bottom line would look like: ———————————————————— |Ctrl|Alt|Ctrl| Space Bar […]
How to turn the space bar to another ctrl key? It will be dam useful especially for Emacs users and also useful for normal usage like for tab changing in Chrome or Gnome terminal. You may try 2 tools in userspace: Space2Ctrl: https://github.com/r0adrunner/Space2Ctrl xcape: https://github.com/alols/xcape Note that the limitation of these solutions: the space will […]
How to swap alt and ctrl on Linux for Emacs? It will be more easier to press the ctrl keys which is a very important key for Emacs. You can make of xmodmap. Save this as a file modmap: clear control clear mod1 keycode 64 = Control_L NoSymbol Control_L keycode 37 = Alt_L Meta_L Alt_L […]
How to remap the Caps Lock key to Control for Emacs? My left little finger is just so tired… You can either change it in gnome-tweak-tool on Gnome 3: Or: You can make use of 2 tools: xev to find out the key code for Caps Lock and xmodmap to modify key maps. First, run […]
How to make Emacs run in command line by default? I do not want to open the X window. You have at least 2 choices. First choice: use emacs-nox and make it the default: # yum install emacs-nox # alternatives –config emacs and choose emacs-nox. Second choice: use emacs but with -nw to disable the […]
I use Emacs in console. The linum-mode displays the line numbers just well. However, in the console, there is no space between the line numbers and the text content, which makes it a little messy some times. How to add a space between the line numbers and text content in Emacs? If you are using […]
I use Emacs in consoles and start Emacs frequently (like check a file, edit it, close it and loop). However, Emacs seems take some time to start up especially some modes/extensions are used. How to make Emacs start up faster? I summarize my solution at this post: Making Emacs Startup Faster. The key is to […]
On Linux, a default editor is used for text editing such as crontab -e or git commit. How to change it to the editor of my own choice? The default editor is indicated by the EDITOR environment variable. You can set this environment variable to set the default editor. For example, set it to emacs […]
You may already well know “Linux” and may also use the “operating system based on the Linux kernel” directly or indirectly (you are indirectly using it now as this site is hosted on Linux). But how should we name the OS based on Linux? You may know there is GNU/Linux naming controversy. Different people have […]