MacOS – How to change the icon of Emacs installed via Homebrew

emacshomebrewmacos

I am aware of the "Get Info" process of changing icons, but when I change the icon of Emacs, nothing happens

I installed Emacs with this command:

brew install emacs --HEAD --with-cocoa

When I run csrutil status I get disabled.

I am able to change the icons of folders but not apps

Best Answer

App icons are part of the application and not something easily changed by the user.

Changing the icon will change the data the application hashses over for its signature and so some things will complain the application is corrupt.

Icons can be changed by going to the Application in Finder and then choose Show Package Contents. In the simplest case an icon file will usually be for application X (I think the developer can decide to use another name) X.app/Contents/Resources/X.icns You can then replace that file. However if the application is well written and so complies with Apple's Human Interface Guidelines there will be several icons

Every app must include several sizes of its app icon for display in the Finder, Dock, Launchpad, and elsewhere.

Note that when Homebrew gets an updated version of Emacs and you update it will overwrite the change you made.

With Emacsclient, keeping Emacs running all the time

Emacs uses a slightly different setup than e.g. vim. The editor itself can remain active all the time (because you may have it open for other things as well) and you use a utility called emacsclient to connect to it (pass a file to edit) if you need it.

Add the following line to your config file (.emacs):

(server-start)  ; Starts server for (among others) emacsclient

Or, if you don't wish to keep the server for emacsclient running at all times, you may issue the command M-x server-start to emacs when you're ready to run. Issuing that command is probably the right thing to do when you're already running emacs, unless you want to reload .emacs.

All you have to do now is to make sure that MUTT uses emacsclient as its editor. You can do this by adding the following line to your config file (.muttrc):

set editor="emacsclient"

Recent versions of mutt (at least 1.4.1) require the following format:

set editor="emacsclient %s"

Source: Emacs and MUTT

Starting Emacs every time

set editor="emacs %s"

Best Answer

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With Emacsclient, keeping Emacs running all the time

Starting Emacs every time

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