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Fresh install of Ubuntu 20.04
Added openjdk-11 and lein 2.9.3

$ sudo apt-add-repository ppa:kelleyk/emacs

Installed
GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.14)
of 2020-03-26, modified by Debian

Tried the instructions on the cider Getting Started page

M-x package-refresh-contents
M-x package install <RET>
cider <RET>

The cider package isn’t found. Tried to package-list-packages – list doesn’t contain cider.
What am I missing?

Finally did the steps from the following link to get it to work
Brave Clojure book companion repo

4

Answers


  1. Chosen as BEST ANSWER

    Not sure why the cider instructions don't mention this.

    You need to create a ~/.emacs.d/init.el file with the following contents

    (require 'package)
    
    (add-to-list 'package-archives
                 '("melpa" . "https://melpa.org/packages/") t)
    
    (package-initialize)
    
    (when (not package-archive-contents)
      (package-refresh-contents))
    

    Save and restart emacs.

    M-x package-list-packages check the archive column shows packages from gnu as well as melpa archives.

    • Sometimes you would see an error Failed to download ‘gnu’ archive. - this one is a flaky one. A restart and/or M-x package-refresh-contents fixed it for me.

    Now we have the sources configured correctly.

    1. Install: M-x package-install <RET> cider <RET>

    2. M-x package-list-packages - Move to the end of the listing to see Status=installed packages.

    3. Test: M-x cider-jack-in. Answer no to the prompt indicating you are not in a clojure project. Soon you should be dropped to a user> prompt - ready to REPL and roll.


  2. You may also consider trying out popular existing “bundle setups’ like Spacemacs and Prelude Both of which have all the tooling necessary for Clojure development built-in.

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  3. Instead of modifying .emacs or init file manually, you can just change the package-archives variable by typing the following:

    M-x customize-variable package-archives
    

    By default, you should only have a GNU source set. Go ahead and add Melpa’s name and URL (https://melpa.org/packages/) too by clicking INS. Then apply the changes. Next, type the following commands into the terminal:

    M-x package-refresh-contents  [RET]
    M-x package-install [RET] cider [RET]
    

    You should be all set.

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  4. CIDER is available on the two major package.el community maintained repos – MELPA Stable and MELPA.

    After adding the following in my ./emacs, i could install CIDER.

    (setq package-archives
        '(("Elpa"     . "https://elpa.gnu.org/packages/")
          ("Melpa Stable" . "https://stable.melpa.org/packages/")
          ("Melpa"        . "https://melpa.org/packages/")
          ("marmalade" . "http://marmalade-repo.org/packages/"))
        package-archive-priorities
        '(("MELPA Stable" . 10)
          ("GNU ELPA"     . 5)
          ("MELPA"        . 0)))
    
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