emacs/code/elpa/use-package-20221029.1857/use-package.info

This is use-package.info, produced by makeinfo version 6.7 from
use-package.texi.

     Copyright (C) 2012-2022 John Wiegley <johnw@newartisans.com>

     You can redistribute this document and/or modify it under the terms
     of the GNU General Public License as published by the Free Software
     Foundation, either version 3 of the License, or (at your option)
     any later version.

     This document is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

INFO-DIR-SECTION Emacs
START-INFO-DIR-ENTRY
* use-package: (use-package). Declarative package configuration for Emacs.
END-INFO-DIR-ENTRY


File: use-package.info,  Node: Top,  Next: Introduction,  Up: (dir)

use-package User Manual
***********************

The ‘use-package’ macro allows you to isolate package configuration in
your ‘.emacs’ file in a way that is both performance-oriented and, well,
tidy.  I created it because I have over 80 packages that I use in Emacs,
and things were getting difficult to manage.  Yet with this utility my
total load time is around 2 seconds, with no loss of functionality!

     Copyright (C) 2012-2022 John Wiegley <johnw@newartisans.com>

     You can redistribute this document and/or modify it under the terms
     of the GNU General Public License as published by the Free Software
     Foundation, either version 3 of the License, or (at your option)
     any later version.

     This document is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

* Menu:

* Introduction::
* Installation::
* Getting Started::
* Basic Concepts::
* Issues/Requests::
* Keywords::
* Debugging Tools::

— The Detailed Node Listing —

Installation

* Installing from an Elpa Archive::
* Installing from the Git Repository::
* Post-Installation Tasks::

Keywords

* after::
* ‘bind-keymap’, ‘bind-keymap*’: bind-keymap bind-keymap*.
* ‘bind’, ‘bind*’: bind bind*.
* commands::
* ‘preface’, ‘init’, ‘config’: preface init config.
* custom::
* custom-face::
* ‘defer’, ‘demand’: defer demand.
* ‘defines’, ‘functions’: defines functions.
* ‘diminish’, ‘delight’: diminish delight.
* disabled::
* ‘ensure’, ‘pin’: ensure pin.
* hook::
* ‘if’, ‘when’, ‘unless’: if when unless.
* load-path::
* ‘mode’, ‘interpreter’: mode interpreter.
* ‘magic’, ‘magic-fallback’: magic magic-fallback.
* no-require::
* requires::

‘:bind’, ‘:bind*’

* Binding to local keymaps::




File: use-package.info,  Node: Introduction,  Next: Installation,  Prev: Top,  Up: Top

1 Introduction
**************

The ‘use-package’ macro allows you to isolate package configuration in
your ‘.emacs’ file in a way that is both performance-oriented and, well,
tidy.  I created it because I have over 80 packages that I use in Emacs,
and things were getting difficult to manage.  Yet with this utility my
total load time is around 2 seconds, with no loss of functionality!

   More text to come...


File: use-package.info,  Node: Installation,  Next: Getting Started,  Prev: Introduction,  Up: Top

2 Installation
**************

use-package can be installed using Emacs’ package manager or manually
from its development repository.

* Menu:

* Installing from an Elpa Archive::
* Installing from the Git Repository::
* Post-Installation Tasks::


File: use-package.info,  Node: Installing from an Elpa Archive,  Next: Installing from the Git Repository,  Up: Installation

2.1 Installing from an Elpa Archive
===================================

use-package is available from Melpa and Melpa-Stable.  If you haven’t
used Emacs’ package manager before, then it is high time you familiarize
yourself with it by reading the documentation in the Emacs manual, see
*note (emacs)Packages::.  Then add one of the archives to
‘package-archives’:

   • To use Melpa:

     (require 'package)
     (add-to-list 'package-archives
                  '("melpa" . "https://melpa.org/packages/") t)

   • To use Melpa-Stable:

     (require 'package)
     (add-to-list 'package-archives
                  '("melpa-stable" . "https://stable.melpa.org/packages/") t)

   Once you have added your preferred archive, you need to update the
local package list using:

     M-x package-refresh-contents RET

   Once you have done that, you can install use-package and its
dependencies using:

     M-x package-install RET use-package RET

   Now see *note Post-Installation Tasks::.


File: use-package.info,  Node: Installing from the Git Repository,  Next: Post-Installation Tasks,  Prev: Installing from an Elpa Archive,  Up: Installation

2.2 Installing from the Git Repository
======================================

First, use Git to clone the use-package repository:

     $ git clone https://github.com/jwiegley/use-package.git ~/.emacs.d/site-lisp/use-package
     $ cd ~/.emacs.d/site-lisp/use-package

   Then compile the libraries and generate the info manuals:

     $ make

   You may need to create ‘/path/to/use-package/config.mk’ with the
following content before running ‘make’:

     LOAD_PATH  = -L /path/to/use-package

   Finally add this to your init file:

     (add-to-list 'load-path "~/.emacs.d/site-lisp/use-package")
     (require 'use-package)

     (with-eval-after-load 'info
       (info-initialize)
       (add-to-list 'Info-directory-list
                    "~/.emacs.d/site-lisp/use-package/"))

   Note that elements of ‘load-path’ should not end with a slash, while
those of ‘Info-directory-list’ should.

   Instead of running use-package directly from the repository by adding
it to the ‘load-path’, you might want to instead install it in some
other directory using ‘sudo make install’ and setting ‘load-path’
accordingly.

   To update use-package use:

     $ git pull
     $ make

   At times it might be necessary to run ‘make clean all’ instead.

   To view all available targets use ‘make help’.

   Now see *note Post-Installation Tasks::.


File: use-package.info,  Node: Post-Installation Tasks,  Prev: Installing from the Git Repository,  Up: Installation

2.3 Post-Installation Tasks
===========================

After installing use-package you should verify that you are indeed using
the use-package release you think you are using.  It’s best to restart
Emacs before doing so, to make sure you are not using an outdated value
for ‘load-path’.

     C-h v use-package-version RET

   should display something like

     use-package-version’s value is "2.4.1"

   If you are completely new to use-package then see *note Getting
Started::.

   If you run into problems, then please see the *note Debugging
Tools::.


File: use-package.info,  Node: Getting Started,  Next: Basic Concepts,  Prev: Installation,  Up: Top

3 Getting Started
*****************

TODO.  For now, see ‘README.md’.


File: use-package.info,  Node: Basic Concepts,  Next: Issues/Requests,  Prev: Getting Started,  Up: Top

4 Basic Concepts
****************

‘use-package’ was created for few basic reasons, each of which drove the
design in various ways.  Understanding these reasons may help make some
of those decisions clearer:

   • To gather all configuration details of a package into one place,
     making it easier to copy, disable, or move it elsewhere in the init
     file.

   • To reduce duplication and boilerplate, capturing several common
     practices as mere keywords both easy and intuitive to use.

   • To make startup time of Emacs as quick as possible, without
     sacrificing the quantity of add-on packages used.

   • To make it so errors encountered during startup disable only the
     package raising the error, and as little else as possible, leaving
     a close to a functional Emacs as possible.

   • To allow byte-compilation of one’s init file so that any warnings
     or errors seen are meaningful.  In this way, even if
     byte-compilation is not used for speed (reason 3), it can still be
     used as a sanity check.


File: use-package.info,  Node: Issues/Requests,  Next: Keywords,  Prev: Basic Concepts,  Up: Top

5 Issues/Requests
*****************


File: use-package.info,  Node: Keywords,  Next: Debugging Tools,  Prev: Issues/Requests,  Up: Top

6 Keywords
**********

* Menu:

* after::
* ‘bind-keymap’, ‘bind-keymap*’: bind-keymap bind-keymap*.
* ‘bind’, ‘bind*’: bind bind*.
* commands::
* ‘preface’, ‘init’, ‘config’: preface init config.
* custom::
* custom-face::
* ‘defer’, ‘demand’: defer demand.
* ‘defines’, ‘functions’: defines functions.
* ‘diminish’, ‘delight’: diminish delight.
* disabled::
* ‘ensure’, ‘pin’: ensure pin.
* hook::
* ‘if’, ‘when’, ‘unless’: if when unless.
* load-path::
* ‘mode’, ‘interpreter’: mode interpreter.
* ‘magic’, ‘magic-fallback’: magic magic-fallback.
* no-require::
* requires::


File: use-package.info,  Node: after,  Next: bind-keymap bind-keymap*,  Up: Keywords

6.1 ‘:after’
============

Sometimes it only makes sense to configure a package after another has
been loaded, because certain variables or functions are not in scope
until that time.  This can achieved using an ‘:after’ keyword that
allows a fairly rich description of the exact conditions when loading
should occur.  Here is an example:

     (use-package hydra
       :load-path "site-lisp/hydra")

     (use-package ivy
       :load-path "site-lisp/swiper")

     (use-package ivy-hydra
       :after (ivy hydra))

   In this case, because all of these packages are demand-loaded in the
order they occur, the use of ‘:after’ is not strictly necessary.  By
using it, however, the above code becomes order-independent, without an
implicit depedence on the nature of your init file.

   By default, ‘:after (foo bar)’ is the same as ‘:after (:all foo
bar)’, meaning that loading of the given package will not happen until
both ‘foo’ and ‘bar’ have been loaded.  Here are some of the other
possibilities:

     :after (foo bar)
     :after (:all foo bar)
     :after (:any foo bar)
     :after (:all (:any foo bar) (:any baz quux))
     :after (:any (:all foo bar) (:all baz quux))

   When you nest selectors, such as ‘(:any (:all foo bar) (:all baz
quux))’, it means that the package will be loaded when either both ‘foo’
and ‘bar’ have been loaded, or both ‘baz’ and ‘quux’ have been loaded.

   *NOTE*: Pay attention if you set ‘use-package-always-defer’ to t, and
also use the ‘:after’ keyword, as you will need to specify how the
declared package is to be loaded: e.g., by some ‘:bind’.  If you’re not
using one of the mechanisms that registers autoloads, such as ‘:bind’ or
‘:hook’, and your package manager does not provide autoloads, it’s
possible that without adding ‘:demand t’ to those declarations, your
package will never be loaded.


File: use-package.info,  Node: bind-keymap bind-keymap*,  Next: bind bind*,  Prev: after,  Up: Keywords

6.2 ‘:bind-keymap’, ‘:bind-keymap*’
===================================

Normally ‘:bind’ expects that commands are functions that will be
autoloaded from the given package.  However, this does not work if one
of those commands is actually a keymap, since keymaps are not functions,
and cannot be autoloaded using Emacs’ ‘autoload’ mechanism.

   To handle this case, ‘use-package’ offers a special, limited variant
of ‘:bind’ called ‘:bind-keymap’.  The only difference is that the
"commands" bound to by ‘:bind-keymap’ must be keymaps defined in the
package, rather than command functions.  This is handled behind the
scenes by generating custom code that loads the package containing the
keymap, and then re-executes your keypress after the first load, to
reinterpret that keypress as a prefix key.

   For example:

     (use-package projectile
       :bind-keymap
       ("C-c p" . projectile-command-map)


File: use-package.info,  Node: bind bind*,  Next: commands,  Prev: bind-keymap bind-keymap*,  Up: Keywords

6.3 ‘:bind’, ‘:bind*’
=====================

Another common thing to do when loading a module is to bind a key to
primary commands within that module:

     (use-package ace-jump-mode
       :bind ("C-." . ace-jump-mode))

   This does two things: first, it creates an autoload for the
‘ace-jump-mode’ command and defers loading of ‘ace-jump-mode’ until you
actually use it.  Second, it binds the key ‘C-.’ to that command.  After
loading, you can use ‘M-x describe-personal-keybindings’ to see all such
keybindings you’ve set throughout your ‘.emacs’ file.

   A more literal way to do the exact same thing is:

     (use-package ace-jump-mode
       :commands ace-jump-mode
       :init
       (bind-key "C-." 'ace-jump-mode))

   When you use the ‘:commands’ keyword, it creates autoloads for those
commands and defers loading of the module until they are used.  Since
the ‘:init’ form is always run—even if ‘ace-jump-mode’ might not be on
your system—remember to restrict ‘:init’ code to only what would succeed
either way.

   The ‘:bind’ keyword takes either a cons or a list of conses:

     (use-package hi-lock
       :bind (("M-o l" . highlight-lines-matching-regexp)
              ("M-o r" . highlight-regexp)
              ("M-o w" . highlight-phrase)))

   The ‘:commands’ keyword likewise takes either a symbol or a list of
symbols.

   NOTE: Special keys like ‘tab’ or ‘F1’-‘Fn’ can be written in square
brackets, i.e.  ‘[tab]’ instead of ‘"tab"’.  The syntax for the
keybindings is similar to the "kbd" syntax: see the Emacs Manual
(https://www.gnu.org/software/emacs/manual/html_node/emacs/Init-Rebinding.html)
for more information.

   Examples:

     (use-package helm
       :bind (("M-x" . helm-M-x)
              ("M-<f5>" . helm-find-files)
              ([f10] . helm-buffers-list)
              ([S-f10] . helm-recentf)))

* Menu:

* Binding to local keymaps::


File: use-package.info,  Node: Binding to local keymaps,  Up: bind bind*

6.3.1 Binding to local keymaps
------------------------------

Slightly different from binding a key to a keymap, is binding a key
*within* a local keymap that only exists after the package is loaded.
‘use-package’ supports this with a ‘:map’ modifier, taking the local
keymap to bind to:

     (use-package helm
       :bind (:map helm-command-map
              ("C-c h" . helm-execute-persistent-action)))

   The effect of this statement is to wait until ‘helm’ has loaded, and
then to bind the key ‘C-c h’ to ‘helm-execute-persistent-action’ within
Helm’s local keymap, ‘helm-mode-map’.

   Multiple uses of ‘:map’ may be specified.  Any binding occurring
before the first use of ‘:map’ are applied to the global keymap:

     (use-package term
       :bind (("C-c t" . term)
              :map term-mode-map
              ("M-p" . term-send-up)
              ("M-n" . term-send-down)
              :map term-raw-map
              ("M-o" . other-window)
              ("M-p" . term-send-up)
              ("M-n" . term-send-down)))


File: use-package.info,  Node: commands,  Next: preface init config,  Prev: bind bind*,  Up: Keywords

6.4 ‘:commands’
===============


File: use-package.info,  Node: preface init config,  Next: custom,  Prev: commands,  Up: Keywords

6.5 ‘:preface’, ‘:init’, ‘:config’
==================================

Here is the simplest ‘use-package’ declaration:

     ;; This is only needed once, near the top of the file
     (eval-when-compile
       ;; Following line is not needed if use-package.el is in ~/.emacs.d
       (add-to-list 'load-path "<path where use-package is installed>")
       (require 'use-package))

     (use-package foo)

   This loads in the package ‘foo’, but only if ‘foo’ is available on
your system.  If not, a warning is logged to the ‘*Messages*’ buffer.
If it succeeds, a message about ‘"Loading foo"’ is logged, along with
the time it took to load, if it took over 0.1 seconds.

   Use the ‘:init’ keyword to execute code before a package is loaded.
It accepts one or more forms, up until the next keyword:

     (use-package foo
       :init
       (setq foo-variable t))

   Similarly, ‘:config’ can be used to execute code after a package is
loaded.  In cases where loading is done lazily (see more about
autoloading below), this execution is deferred until after the autoload
occurs:

     (use-package foo
       :init
       (setq foo-variable t)
       :config
       (foo-mode 1))

   As you might expect, you can use ‘:init’ and ‘:config’ together:

     (use-package color-moccur
       :commands (isearch-moccur isearch-all)
       :bind (("M-s O" . moccur)
              :map isearch-mode-map
              ("M-o" . isearch-moccur)
              ("M-O" . isearch-moccur-all))
       :init
       (setq isearch-lazy-highlight t)
       :config
       (use-package moccur-edit))

   In this case, I want to autoload the commands ‘isearch-moccur’ and
‘isearch-all’ from ‘color-moccur.el’, and bind keys both at the global
level and within the ‘isearch-mode-map’ (see next section).  When the
package is actually loaded (by using one of these commands),
‘moccur-edit’ is also loaded, to allow editing of the ‘moccur’ buffer.


File: use-package.info,  Node: custom,  Next: custom-face,  Prev: preface init config,  Up: Keywords

6.6 ‘:custom’
=============

The ‘:custom’ keyword allows customization of package custom variables.

     (use-package comint
       :custom
       (comint-buffer-maximum-size 20000 "Increase comint buffer size.")
       (comint-prompt-read-only t "Make the prompt read only."))

   The documentation string is not mandatory.


File: use-package.info,  Node: custom-face,  Next: defer demand,  Prev: custom,  Up: Keywords

6.7 ‘:custom-face’
==================

The ‘:custom-face’ keyword allows customization of package custom faces.

     (use-package eruby-mode
       :custom-face
       (eruby-standard-face ((t (:slant italic)))))


File: use-package.info,  Node: defer demand,  Next: defines functions,  Prev: custom-face,  Up: Keywords

6.8 ‘:defer’, ‘:demand’
=======================

In almost all cases you don’t need to manually specify ‘:defer t’.  This
is implied whenever ‘:bind’ or ‘:mode’ or ‘:interpreter’ is used.
Typically, you only need to specify ‘:defer’ if you know for a fact that
some other package will do something to cause your package to load at
the appropriate time, and thus you would like to defer loading even
though use-package isn’t creating any autoloads for you.

   You can override package deferral with the ‘:demand’ keyword.  Thus,
even if you use ‘:bind’, using ‘:demand’ will force loading to occur
immediately and not establish an autoload for the bound key.


File: use-package.info,  Node: defines functions,  Next: diminish delight,  Prev: defer demand,  Up: Keywords

6.9 ‘:defines’, ‘:functions’
============================

Another feature of ‘use-package’ is that it always loads every file that
it can when ‘.emacs’ is being byte-compiled.  This helps to silence
spurious warnings about unknown variables and functions.

   However, there are times when this is just not enough.  For those
times, use the ‘:defines’ and ‘:functions’ keywords to introduce dummy
variable and function declarations solely for the sake of the
byte-compiler:

     (use-package texinfo
       :defines texinfo-section-list
       :commands texinfo-mode
       :init
       (add-to-list 'auto-mode-alist '("\\.texi$" . texinfo-mode)))

   If you need to silence a missing function warning, you can use
‘:functions’:

     (use-package ruby-mode
       :mode "\\.rb\\'"
       :interpreter "ruby"
       :functions inf-ruby-keys
       :config
       (defun my-ruby-mode-hook ()
         (require 'inf-ruby)
         (inf-ruby-keys))

       (add-hook 'ruby-mode-hook 'my-ruby-mode-hook))


File: use-package.info,  Node: diminish delight,  Next: disabled,  Prev: defines functions,  Up: Keywords

6.10 ‘:diminish’, ‘:delight’
============================

‘use-package’ also provides built-in support for the diminish and
delight utilities—if you have them installed.  Their purpose is to
remove or change minor mode strings in your mode-line.

   diminish (https://github.com/myrjola/diminish.el) is invoked with the
‘:diminish’ keyword, which is passed either a minor mode symbol, a cons
of the symbol and its replacement string, or just a replacement string,
in which case the minor mode symbol is guessed to be the package name
with "-mode" appended at the end:

     (use-package abbrev
       :diminish abbrev-mode
       :config
       (if (file-exists-p abbrev-file-name)
           (quietly-read-abbrev-file)))

   delight (https://elpa.gnu.org/packages/delight.html) is invoked with
the ‘:delight’ keyword, which is passed a minor mode symbol, a
replacement string or quoted mode-line data
(https://www.gnu.org/software/emacs/manual/html_node/elisp/Mode-Line-Data.html)
(in which case the minor mode symbol is guessed to be the package name
with "-mode" appended at the end), both of these, or several lists of
both.  If no arguments are provided, the default mode name is hidden
completely.

     ;; Don't show anything for rainbow-mode.
     (use-package rainbow-mode
       :delight)

     ;; Don't show anything for auto-revert-mode, which doesn't match
     ;; its package name.
     (use-package autorevert
       :delight auto-revert-mode)

     ;; Remove the mode name for projectile-mode, but show the project name.
     (use-package projectile
       :delight '(:eval (concat " " (projectile-project-name))))

     ;; Completely hide visual-line-mode and change auto-fill-mode to " AF".
     (use-package emacs
       :delight
       (auto-fill-function " AF")
       (visual-line-mode))


File: use-package.info,  Node: disabled,  Next: ensure pin,  Prev: diminish delight,  Up: Keywords

6.11 ‘:disabled’
================

The ‘:disabled’ keyword can turn off a module you’re having difficulties
with, or stop loading something you’re not using at the present time:

     (use-package ess-site
       :disabled
       :commands R)

   When byte-compiling your ‘.emacs’ file, disabled declarations are
omitted from the output entirely, to accelerate startup times.


File: use-package.info,  Node: ensure pin,  Next: hook,  Prev: disabled,  Up: Keywords

6.12 ‘:ensure’, ‘:pin’
======================

You can use ‘use-package’ to load packages from ELPA with ‘package.el’.
This is particularly useful if you share your ‘.emacs’ among several
machines; the relevant packages are downloaded automatically once
declared in your ‘.emacs’.  The ‘:ensure’ keyword causes the package(s)
to be installed automatically if not already present on your system (set
‘(setq use-package-always-ensure t)’ if you wish this behavior to be
global for all packages):

     (use-package magit
       :ensure t)

   If you need to install a different package from the one named by
‘use-package’, you can specify it like this:

     (use-package tex
       :ensure auctex)

   Lastly, when running on Emacs 24.4 or later, use-package can pin a
package to a specific archive, allowing you to mix and match packages
from different archives.  The primary use-case for this is preferring
packages from the ‘melpa-stable’ and ‘gnu’ archives, but using specific
packages from ‘melpa’ when you need to track newer versions than what is
available in the ‘stable’ archives is also a valid use-case.

   By default ‘package.el’ prefers ‘melpa’ over ‘melpa-stable’ due to
the versioning ‘(> evil-20141208.623 evil-1.0.9)’, so even if you are
tracking only a single package from ‘melpa’, you will need to tag all
the non-‘melpa’ packages with the appropriate archive.  If this really
annoys you, then you can set ‘use-package-always-pin’ to set a default.

   If you want to manually keep a package updated and ignore upstream
updates, you can pin it to ‘manual’, which as long as there is no
repository by that name, will Just Work(tm).

   ‘use-package’ throws an error if you try to pin a package to an
archive that has not been configured using ‘package-archives’ (apart
from the magic ‘manual’ archive mentioned above):

     Archive 'foo' requested for package 'bar' is not available.

   Example:

     (use-package company
       :ensure t
       :pin melpa-stable)

     (use-package evil
       :ensure t)
       ;; no :pin needed, as package.el will choose the version in melpa

     (use-package adaptive-wrap
       :ensure t
       ;; as this package is available only in the gnu archive, this is
       ;; technically not needed, but it helps to highlight where it
       ;; comes from
       :pin gnu)

     (use-package org
       :ensure t
       ;; ignore org-mode from upstream and use a manually installed version
       :pin manual)

   *NOTE*: the ‘:pin’ argument has no effect on emacs versions < 24.4.


File: use-package.info,  Node: hook,  Next: if when unless,  Prev: ensure pin,  Up: Keywords

6.13 ‘:hook’
============

The ‘:hook’ keyword allows adding functions onto hooks, here only the
basename of the hook is required.  Thus, all of the following are
equivalent:

     (use-package ace-jump-mode
       :hook prog-mode)

     (use-package ace-jump-mode
       :hook (prog-mode . ace-jump-mode))

     (use-package ace-jump-mode
       :commands ace-jump-mode
       :init
       (add-hook 'prog-mode-hook #'ace-jump-mode))

   And likewise, when multiple hooks should be applied, the following
are also equivalent:

     (use-package ace-jump-mode
       :hook (prog-mode text-mode))

     (use-package ace-jump-mode
       :hook ((prog-mode text-mode) . ace-jump-mode))

     (use-package ace-jump-mode
       :hook ((prog-mode . ace-jump-mode)
              (text-mode . ace-jump-mode)))

     (use-package ace-jump-mode
       :commands ace-jump-mode
       :init
       (add-hook 'prog-mode-hook #'ace-jump-mode)
       (add-hook 'text-mode-hook #'ace-jump-mode))

   The use of ‘:hook’, as with ‘:bind’, ‘:mode’, ‘:interpreter’, etc.,
causes the functions being hooked to implicitly be read as ‘:commands’
(meaning they will establish interactive ‘autoload’ definitions for that
module, if not already defined as functions), and so ‘:defer t’ is also
implied by ‘:hook’.


File: use-package.info,  Node: if when unless,  Next: load-path,  Prev: hook,  Up: Keywords

6.14 ‘:if’, ‘:when’, ‘:unless’
==============================

You can use the ‘:if’ keyword to predicate the loading and
initialization of modules.

   For example, I only want ‘edit-server’ running for my main, graphical
Emacs, not for other Emacsen I may start at the command line:

     (use-package edit-server
       :if window-system
       :init
       (add-hook 'after-init-hook 'server-start t)
       (add-hook 'after-init-hook 'edit-server-start t))

   In another example, we can load things conditional on the operating
system:

     (use-package exec-path-from-shell
       :if (memq window-system '(mac ns))
       :ensure t
       :config
       (exec-path-from-shell-initialize))

   Note that ‘:when’ is provided as an alias for ‘:if’, and ‘:unless
foo’ means the same thing as ‘:if (not foo)’.


File: use-package.info,  Node: load-path,  Next: mode interpreter,  Prev: if when unless,  Up: Keywords

6.15 ‘:load-path’
=================

If your package needs a directory added to the ‘load-path’ in order to
load, use ‘:load-path’.  This takes a symbol, a function, a string or a
list of strings.  If the path is relative, it is expanded within
‘user-emacs-directory’:

     (use-package ess-site
       :load-path "site-lisp/ess/lisp/"
       :commands R)

   Note that when using a symbol or a function to provide a dynamically
generated list of paths, you must inform the byte-compiler of this
definition so the value is available at byte-compilation time.  This is
done by using the special form ‘eval-and-compile’ (as opposed to
‘eval-when-compile’).  Further, this value is fixed at whatever was
determined during compilation, to avoid looking up the same information
again on each startup:

     (eval-and-compile
       (defun ess-site-load-path ()
         (shell-command "find ~ -path ess/lisp")))

     (use-package ess-site
       :load-path (lambda () (list (ess-site-load-path)))
       :commands R)


File: use-package.info,  Node: mode interpreter,  Next: magic magic-fallback,  Prev: load-path,  Up: Keywords

6.16 ‘:mode’, ‘:interpreter’
============================

Similar to ‘:bind’, you can use ‘:mode’ and ‘:interpreter’ to establish
a deferred binding within the ‘auto-mode-alist’ and
‘interpreter-mode-alist’ variables.  The specifier to either keyword can
be a cons cell, a list of cons cells, or a string or regexp:

     (use-package ruby-mode
       :mode "\\.rb\\'"
       :interpreter "ruby")

     ;; The package is "python" but the mode is "python-mode":
     (use-package python
       :mode ("\\.py\\'" . python-mode)
       :interpreter ("python" . python-mode))

   If you aren’t using ‘:commands’, ‘:bind’, ‘:bind*’, ‘:bind-keymap’,
‘:bind-keymap*’, ‘:mode’, or ‘:interpreter’ (all of which imply
‘:defer’; see the docstring for ‘use-package’ for a brief description of
each), you can still defer loading with the ‘:defer’ keyword:

     (use-package ace-jump-mode
       :defer t
       :init
       (autoload 'ace-jump-mode "ace-jump-mode" nil t)
       (bind-key "C-." 'ace-jump-mode))

   This does exactly the same thing as the following:

     (use-package ace-jump-mode
       :bind ("C-." . ace-jump-mode))


File: use-package.info,  Node: magic magic-fallback,  Next: no-require,  Prev: mode interpreter,  Up: Keywords

6.17 ‘:magic’, ‘:magic-fallback’
================================

Similar to ‘:mode’ and ‘:interpreter’, you can also use ‘:magic’ and
‘:magic-fallback’ to cause certain function to be run if the beginning
of a file matches a given regular expression.  The difference between
the two is that ‘:magic-fallback’ has a lower priority than ‘:mode’.
For example:

     (use-package pdf-tools
       :load-path "site-lisp/pdf-tools/lisp"
       :magic ("%PDF" . pdf-view-mode)
       :config
       (pdf-tools-install))

   This registers an autoloaded command for ‘pdf-view-mode’, defers
loading of ‘pdf-tools’, and runs ‘pdf-view-mode’ if the beginning of a
buffer matches the string ‘"%PDF"’.


File: use-package.info,  Node: no-require,  Next: requires,  Prev: magic magic-fallback,  Up: Keywords

6.18 ‘:no-require’
==================

Normally, ‘use-package’ will load each package at compile time before
compiling the configuration, to ensure that any necessary symbols are in
scope to satisfy the byte-compiler.  At times this can cause problems,
since a package may have special loading requirements, and all that you
want to use ‘use-package’ for is to add a configuration to the
‘eval-after-load’ hook.  In such cases, use the ‘:no-require’ keyword:

     (use-package foo
       :no-require t
       :config
       (message "This is evaluated when `foo' is loaded"))


File: use-package.info,  Node: requires,  Prev: no-require,  Up: Keywords

6.19 ‘:requires’
================

While the ‘:after’ keyword delays loading until the dependencies are
loaded, the somewhat simpler ‘:requires’ keyword simply never loads the
package if the dependencies are not available at the time the
‘use-package’ declaration is encountered.  By "available" in this
context it means that ‘foo’ is available of ‘(featurep 'foo)’ evaluates
to a non-nil value.  For example:

     (use-package abbrev
       :requires foo)

   This is the same as:

     (use-package abbrev
       :if (featurep 'foo))

   As a convenience, a list of such packages may be specified:

     (use-package abbrev
       :requires (foo bar baz))

   For more complex logic, such as that supported by ‘:after’, simply
use ‘:if’ and the appropriate Lisp expression.


File: use-package.info,  Node: Debugging Tools,  Prev: Keywords,  Up: Top

7 Debugging Tools
*****************

TODO



Tag Table:
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Node: Introduction2828
Node: Installation3339
Node: Installing from an Elpa Archive3691
Node: Installing from the Git Repository4820
Node: Post-Installation Tasks6363
Node: Getting Started7051
Node: Basic Concepts7230
Node: Issues/Requests8394
Node: Keywords8531
Node: after9299
Node: bind-keymap bind-keymap*11311
Node: bind bind*12364
Node: Binding to local keymaps14439
Node: commands15586
Node: preface init config15728
Node: custom17827
Node: custom-face18267
Node: defer demand18587
Node: defines functions19399
Node: diminish delight20544
Node: disabled22487
Node: ensure pin22982
Node: hook25712
Node: if when unless27137
Node: load-path28083
Node: mode interpreter29229
Node: magic magic-fallback30540
Node: no-require31394
Node: requires32098
Node: Debugging Tools32985

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