PIE - Package Installer for Emacs

Introduction

Pie is a very simple Package Installer for Emacs. It has less features than Elpaca, Straight etc.

I used to use package.el (and elpa/melpa etc.), but it has some drawbacks IMO, including:

• A single repository may be split into several packages. Some people like it, but not including me.
• It does not support optional dependencies. When I say optional dependency, I mean, for example, package A depends on B or C to get nearly identical functionality, but you don’t need them at the same time. But when using package + (m)elpa, you need to install both B and C. Some packages on melpa have this kind of problem, but I forget their names. But I must admit it’s a little unfair to compare package.el and pie in this way, because when using pie, you write recipes yourself, but when using package.el, you cannot control how a recipe of a package is written.

I’ve only tested/used it with Emacs 28.2 on Linux, maybe there are some problems on Windows and/or Mac.

Features

Pie supports the following features:

• Support cloning a repository or downloading files (e.g. from emacswiki) directly.
• Support cloning a particular branch/tag/commit
• Support git’s shadow clone
• Support customized building logic
• Support specifying dependencies according to your actual needs
• Support generating autoloads files and loading it

Install and use it

Clone this repository to some directory and add it to load-path.

Here are some examples.

(require 'pie)
(setq pie-repos-directory "/path/to/repos/directory")

(setq pie-builds-directory "/path/to/builds/directory")

(pie "s"
     "https://github.com/magnars/s.el"
     :branch "1.13.0")

(pie "bash-completion"
     "https://github.com/szermatt/emacs-bash-completion"
     :rev "de2c844")

(pie "magit"
     "https://github.com/magit/magit"
     :lisp-dir "lisp"
     :deps '("compat" "dash" "with-editor"))

(pie "lspce"
     "https://bitbucket.org/zbelial/lspce"
     :deps '("markdown-mode" "yasnippet")
     :build #'(lambda (pp)
                (let* ((name (pie-package-package pp))
                       (lisp-dir (pie-package-lisp-dir pp))
                       (default-directory lisp-dir)
                       (files (directory-files lisp-dir t "\\.el$"))
                       (autoloads (concat (file-name-nondirectory (directory-file-name lisp-dir)) "-autoloads.el")))
                  (shell-command "cargo clean && cargo build --release && ln -s target/release/liblspce_module.so lspce-module.so")
                  (cl-dolist (file files)
                    (when (not (string-suffix-p ".dir-locals.el" file))
                      (byte-compile-file file)))
                  (make-directory-autoloads lisp-dir autoloads))))


;; then you can call `pie-install-packages' to install all packages, or
;; use pie-use-package to install and config packages
;; pie-use-package mimics use-package, but has less features. Here is an example

(pie-use-package yafolding
  :pie t ;; or use :pie yafolding
  :when (eq system-type windows-nt)
  :autoloads (yafolding-toggle-element-dwim)
  :demand t
  :init (progn
          ;; nothing
          )
  :config (progn
            (add-hook 'prog-mode-hook #'yafolding-mode)
            )
  )

All the keywords that pie supports

backend

Symbol, optional.

Which BACKEND to clone. Should be 'http or a VC backend in vc-handled-backends.

If not specified, use pie-vc-heuristic-alist to determine the value, (or pie-vc-default-backend if no backend can be determined).

branch

String, optional.

Which BRANCH or tag to check out.

rev

String, optional.

Which REV to clone. Has higher priority than branch.

depth

t or a positve nubmer, optional.

Only works with git for now. If specified, the value should be t (all history), or a positive integer. If omitted, use pie-git-depth.

build

Function, optional.

Specify how to build the package. If not specified, use pie-default-build.

There are three different build functions built-in pie, pie-empty-build, pie-autoloads-build and pie-default-build.

deps

List of string or a function returning a list of string. Optional.

lisp-dir

String, optional.

Subdirectory containing elisp files inside the repository.

build-type

If it’s 'repo, then build the package in the repos directory, aka pie-repos-directory/<pkg>.

Else, build it in the builds directory, aka pie-builds-directory/<pkg>.

condition

A function without any parameter, optional.

Only when it (if specified) returns t, this package will be installed.

All the keywords that pie-use-package supports

disabled when pie load-path init config autoloads after demand

If you use/have used use-package, all but `pie` and `autoloads` will be familiar for you.

pie

The value of this keyword can be t or a symbol. See the example above. If this keyword is present, pie-use-package will call `pie–install-package-by-name` to install this package.

autoloads

Similiar to use-package’s commands.

All the defcustom

pie-vc-heuristic-alist

Heuristic mapping URL regular expressions to VC backends.

pie-vc-default-backend

Default: ‘Git.

Default VC backend used when cloning a package repository. If no repository type was specified or could be guessed by pie-vc-heuristic-alist, this is the default VC backend used as fallback. The value must be a member of vc-handled-backends and the named backend must implement the clone function.

pie-git-depth

Default: 1.

Default depth used with git backend.

If no depth is specified explicitly, this value will be used.

pie-activite-package

Default: t.

Whether activite packages after installing them.

pie-repos-directory

Default: ~/.emacs.d/pie/repos.

The directory used to store packages’ repos.

pie-builds-directory

Default: ~/.emacs.d/pie/builds.

The directory used to store built packages.

How does it work

Let’s use a package called A to explain how pie works.

1. It will clone the repository of A to a directory repos/A
2. Then It will copy the repository directory into builds/A directory
3. Use the default/specified building function to build A, and generate a autoload file named A-autoloads.el Building happens in the directory builds/A
4. Add builds/A to load-path and load the A-autoloads file. Actually, for some packages, the directory added to load-path is what is specifed by :lisp-dir (see magit example above)

Some notes

Minimal version of Emacs that pie supports

When I started this project, I was using Emacs 29.0.51. Then I switched back to Emacs 28.2, leaving a function vc-clone, which appeared first in Emacs 29, in the code. And pie will check its existence before using it. I mean, pie should work well in older versions of Emacs, but if you use Emacs older than 29.0.50, pie only supports Git and Http.

License

GPLv3