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transient.el
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transient.el
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;;; transient.el --- Transient commands -*- lexical-binding: t; -*-
;; Copyright (C) 2018-2021 Free Software Foundation, Inc.
;; Author: Jonas Bernoulli <jonas@bernoul.li>
;; Homepage: https://github.com/magit/transient
;; Keywords: bindings
;; Package-Requires: ((emacs "25.1"))
;; Package-Version: 0.3.6
;; SPDX-License-Identifier: GPL-3.0-or-later
;; GNU Emacs is free software: you can redistribute it 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.
;;
;; GNU Emacs 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.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;; This file is part of GNU Emacs.
;;; Commentary:
;; Taking inspiration from prefix keys and prefix arguments, Transient
;; implements a similar abstraction involving a prefix command, infix
;; arguments and suffix commands. We could call this abstraction a
;; "transient command", but because it always involves at least two
;; commands (a prefix and a suffix) we prefer to call it just a
;; "transient".
;; When the user calls a transient prefix command, then a transient
;; (temporary) keymap is activated, which binds the transient's infix
;; and suffix commands, and functions that control the transient state
;; are added to `pre-command-hook' and `post-command-hook'. The
;; available suffix and infix commands and their state are shown in
;; the echo area until the transient is exited by invoking a suffix
;; command.
;; Calling an infix command causes its value to be changed, possibly
;; by reading a new value in the minibuffer.
;; Calling a suffix command usually causes the transient to be exited
;; but suffix commands can also be configured to not exit the
;; transient state.
;;; Code:
(require 'cl-lib)
(require 'eieio)
(require 'format-spec)
(require 'seq)
(eval-when-compile
(require 'subr-x))
(declare-function info 'info)
(declare-function Man-find-section 'man)
(declare-function Man-next-section 'man)
(declare-function Man-getpage-in-background 'man)
(defvar Man-notify-method)
(define-obsolete-function-alias 'define-transient-command
'transient-define-prefix "Transient 0.3.0")
(define-obsolete-function-alias 'define-suffix-command
'transient-define-suffix "Transient 0.3.0")
(define-obsolete-function-alias 'define-infix-command
'transient-define-infix "Transient 0.3.0")
(define-obsolete-function-alias 'define-infix-argument
'transient-define-argument "Transient 0.3.0")
(define-obsolete-variable-alias 'current-transient-prefix
'transient-current-prefix "Transient 0.3.0")
(define-obsolete-variable-alias 'current-transient-command
'transient-current-command "Transient 0.3.0")
(define-obsolete-variable-alias 'current-transient-suffixes
'transient-current-suffixes "Transient 0.3.0")
(define-obsolete-variable-alias 'post-transient-hook
'transient-exit-hook "Transient 0.3.0")
(defmacro transient--with-emergency-exit (&rest body)
(declare (indent defun))
`(condition-case err
(let ((debugger #'transient--exit-and-debug))
,(macroexp-progn body))
((debug error)
(transient--emergency-exit)
(signal (car err) (cdr err)))))
(defun transient--exit-and-debug (&rest args)
(transient--emergency-exit)
(apply #'debug args))
;;; Options
(defgroup transient nil
"Transient commands."
:group 'extensions)
(defcustom transient-show-popup t
"Whether to show the current transient in a popup buffer.
- If t, then show the popup as soon as a transient prefix command
is invoked.
- If nil, then do not show the popup unless the user explicitly
requests it, by pressing an incomplete prefix key sequence.
- If a number, then delay displaying the popup and instead show
a brief one-line summary. If zero or negative, then suppress
even showing that summary and display the pressed key only.
Show the popup when the user explicitly requests it by pressing
an incomplete prefix key sequence. Unless zero, then also show
the popup after that many seconds of inactivity (using the
absolute value)."
:package-version '(transient . "0.1.0")
:group 'transient
:type '(choice (const :tag "instantly" t)
(const :tag "on demand" nil)
(const :tag "on demand (no summary)" 0)
(number :tag "after delay" 1)))
(defcustom transient-enable-popup-navigation nil
"Whether navigation commands are enabled in the transient popup.
While a transient is active the transient popup buffer is not the
current buffer, making it necessary to use dedicated commands to
act on that buffer itself. If this non-nil, then the following
features are available:
- \"<up>\" moves the cursor to the previous suffix.
\"<down>\" moves the cursor to the next suffix.
\"RET\" invokes the suffix the cursor is on.
- \"<mouse-1>\" invokes the clicked on suffix.
- \"C-s\" and \"C-r\" start isearch in the popup buffer."
:package-version '(transient . "0.2.0")
:group 'transient
:type 'boolean)
(defcustom transient-display-buffer-action
'(display-buffer-in-side-window
(side . bottom)
(inhibit-same-window . t))
"The action used to display the transient popup buffer.
The transient popup buffer is displayed in a window using
\(display-buffer buf transient-display-buffer-action)
The value of this option has the form (FUNCTION . ALIST),
where FUNCTION is a function or a list of functions. Each such
function should accept two arguments: a buffer to display and
an alist of the same form as ALIST. See `display-buffer' for
details.
The default is:
(display-buffer-in-side-window
(side . bottom)
(inhibit-same-window . t))
This displays the window at the bottom of the selected frame.
Another useful value is (display-buffer-below-selected). This
is what `magit-popup' used by default. For more alternatives
see info node `(elisp)Display Action Functions'.
It may be possible to display the window in another frame, but
whether that works in practice depends on the window-manager.
If the window manager selects the new window (Emacs frame),
then it doesn't work.
If you change the value of this option, then you might also
want to change the value of `transient-mode-line-format'."
:package-version '(transient . "0.3.0")
:group 'transient
:type '(cons (choice function (repeat :tag "Functions" function))
alist))
(defcustom transient-mode-line-format 'line
"The mode-line format for the transient popup buffer.
If nil, then the buffer has no mode-line. If the buffer is not
displayed right above the echo area, then this probably is not
a good value.
If `line' (the default), then the buffer also has no mode-line,
but a thin line is drawn instead, using the background color of
the face `transient-separator'. Termcap frames cannot display
thin lines and therefore fallback to treating `line' like nil.
Otherwise this can be any mode-line format.
See `mode-line-format' for details."
:package-version '(transient . "0.2.0")
:group 'transient
:type '(choice (const :tag "hide mode-line" nil)
(const :tag "substitute thin line" line)
(const :tag "name of prefix command"
("%e" mode-line-front-space
mode-line-buffer-identification))
(sexp :tag "custom mode-line format")))
(defcustom transient-show-common-commands nil
"Whether to show common transient suffixes in the popup buffer.
These commands are always shown after typing the prefix key
\"C-x\" when a transient command is active. To toggle the value
of this variable use \"C-x t\" when a transient is active."
:package-version '(transient . "0.1.0")
:group 'transient
:type 'boolean)
(defcustom transient-read-with-initial-input nil
"Whether to use the last history element as initial minibuffer input."
:package-version '(transient . "0.2.0")
:group 'transient
:type 'boolean)
(defcustom transient-highlight-mismatched-keys nil
"Whether to highlight keys that do not match their argument.
This only affects infix arguments that represent command-line
arguments. When this option is non-nil, then the key binding
for infix argument are highlighted when only a long argument
\(e.g. \"--verbose\") is specified but no shor-thand (e.g \"-v\").
In the rare case that a short-hand is specified but does not
match the key binding, then it is highlighed differently.
The highlighting is done using using `transient-mismatched-key'
and `transient-nonstandard-key'."
:package-version '(transient . "0.1.0")
:group 'transient
:type 'boolean)
(defcustom transient-highlight-higher-levels nil
"Whether to highlight suffixes on higher levels.
This is primarily intended for package authors.
When non-nil then highlight the description of suffixes whose
level is above 4, the default of `transient-default-level'.
Assuming you have set that variable to 7, this highlights all
suffixes that won't be available to users without them making
the same customization."
:package-version '(transient . "0.3.6")
:group 'transient
:type 'boolean)
(defcustom transient-substitute-key-function nil
"Function used to modify key bindings.
This function is called with one argument, the prefix object,
and must return a key binding description, either the existing
key description it finds in the `key' slot, or a substitution.
This is intended to let users replace certain prefix keys. It
could also be used to make other substitutions, but that is
discouraged.
For example, \"=\" is hard to reach using my custom keyboard
layout, so I substitute \"(\" for that, which is easy to reach
using a layout optimized for Lisp.
(setq transient-substitute-key-function
(lambda (obj)
(let ((key (oref obj key)))
(if (string-match \"\\\\`\\\\(=\\\\)[a-zA-Z]\" key)
(replace-match \"(\" t t key 1)
key)))))"
:package-version '(transient . "0.1.0")
:group 'transient
:type '(choice (const :tag "Transform no keys (nil)" nil) function))
(defcustom transient-semantic-coloring nil
"Whether to color prefixes and suffixes in Hydra-like fashion.
This feature is experimental.
If non-nil, then the key binding of each suffix is colorized to
indicate whether it exits the transient state or not. The color
of the prefix is indicated using the line that is drawn when the
value of `transient-mode-line-format' is `line'.
For more information about how Hydra uses colors see
https://github.com/abo-abo/hydra#color and
https://oremacs.com/2015/02/19/hydra-colors-reloaded."
:package-version '(transient . "0.3.0")
:group 'transient
:type 'boolean)
(defcustom transient-detect-key-conflicts nil
"Whether to detect key binding conflicts.
Conflicts are detected when a transient prefix command is invoked
and results in an error, which prevents the transient from being
used."
:package-version '(transient . "0.1.0")
:group 'transient
:type 'boolean)
(defcustom transient-force-fixed-pitch nil
"Whether to force use of monospaced font in the popup buffer.
Even if you use a proportional font for the `default' face,
you might still want to use a monospaced font in transient's
popup buffer. Setting this option to t causes `default' to
be remapped to `fixed-pitch' in that buffer."
:package-version '(transient . "0.2.0")
:group 'transient
:type 'boolean)
(defcustom transient-force-single-column nil
"Whether to force use of a single column to display suffixes.
This might be useful for users with low vision who use large
text and might otherwise have to scroll in two dimensions."
:package-version '(transient . "0.3.6")
:group 'transient
:type 'boolean)
(defconst transient--default-child-level 1)
(defconst transient--default-prefix-level 4)
(defcustom transient-default-level transient--default-prefix-level
"Control what suffix levels are made available by default.
Each suffix command is placed on a level and each prefix command
has a level, which controls which suffix commands are available.
Integers between 1 and 7 (inclusive) are valid levels.
The levels of individual transients and/or their individual
suffixes can be changed individually, by invoking the prefix and
then pressing \"C-x l\".
The default level for both transients and their suffixes is 4.
This option only controls the default for transients. The default
suffix level is always 4. The author of a transient should place
certain suffixes on a higher level if they expect that it won't be
of use to most users, and they should place very important suffixes
on a lower level so that they remain available even if the user
lowers the transient level.
\(Magit currently places nearly all suffixes on level 4 and lower
levels are not used at all yet. So for the time being you should
not set a lower level here and using a higher level might not
give you as many additional suffixes as you hoped.)"
:package-version '(transient . "0.1.0")
:group 'transient
:type '(choice (const :tag "1 - fewest suffixes" 1)
(const 2)
(const 3)
(const :tag "4 - default" 4)
(const 5)
(const 6)
(const :tag "7 - most suffixes" 7)))
(defcustom transient-levels-file
(locate-user-emacs-file (convert-standard-filename "transient/levels.el"))
"File used to save levels of transients and their suffixes."
:package-version '(transient . "0.1.0")
:group 'transient
:type 'file)
(defcustom transient-values-file
(locate-user-emacs-file (convert-standard-filename "transient/values.el"))
"File used to save values of transients."
:package-version '(transient . "0.1.0")
:group 'transient
:type 'file)
(defcustom transient-history-file
(locate-user-emacs-file (convert-standard-filename "transient/history.el"))
"File used to save history of transients and their infixes."
:package-version '(transient . "0.1.0")
:group 'transient
:type 'file)
(defcustom transient-history-limit 10
"Number of history elements to keep when saving to file."
:package-version '(transient . "0.1.0")
:group 'transient
:type 'integer)
(defcustom transient-save-history t
"Whether to save history of transient commands when exiting Emacs."
:package-version '(transient . "0.1.0")
:group 'transient
:type 'boolean)
;;; Faces
(defgroup transient-faces nil
"Faces used by Transient."
:group 'transient)
(defface transient-heading '((t :inherit font-lock-keyword-face))
"Face used for headings."
:group 'transient-faces)
(defface transient-key '((t :inherit font-lock-builtin-face))
"Face used for keys."
:group 'transient-faces)
(defface transient-argument '((t :inherit font-lock-warning-face))
"Face used for enabled arguments."
:group 'transient-faces)
(defface transient-value '((t :inherit font-lock-string-face))
"Face used for values."
:group 'transient-faces)
(defface transient-inactive-argument '((t :inherit shadow))
"Face used for inactive arguments."
:group 'transient-faces)
(defface transient-inactive-value '((t :inherit shadow))
"Face used for inactive values."
:group 'transient-faces)
(defface transient-unreachable '((t :inherit shadow))
"Face used for suffixes unreachable from the current prefix sequence."
:group 'transient-faces)
(defface transient-active-infix '((t :inherit secondary-selection))
"Face used for the infix for which the value is being read."
:group 'transient-faces)
(defface transient-unreachable-key '((t :inherit shadow))
"Face used for keys unreachable from the current prefix sequence."
:group 'transient-faces)
(defface transient-nonstandard-key '((t :underline t))
"Face optionally used to highlight keys conflicting with short-argument.
Also see option `transient-highlight-mismatched-keys'."
:group 'transient-faces)
(defface transient-mismatched-key '((t :underline t))
"Face optionally used to highlight keys without a short-argument.
Also see option `transient-highlight-mismatched-keys'."
:group 'transient-faces)
(defface transient-inapt-suffix '((t :inherit shadow :italic t))
"Face used for suffixes that are inapt at this time."
:group 'transient-faces)
(defface transient-enabled-suffix
'((t :background "green" :foreground "black" :weight bold))
"Face used for enabled levels while editing suffix levels.
See info node `(transient)Enabling and Disabling Suffixes'."
:group 'transient-faces)
(defface transient-disabled-suffix
'((t :background "red" :foreground "black" :weight bold))
"Face used for disabled levels while editing suffix levels.
See info node `(transient)Enabling and Disabling Suffixes'."
:group 'transient-faces)
(defface transient-higher-level '((t :underline t))
"Face optionally used to highlight suffixes on higher levels.
Also see option `transient-highlight-higher-levels'."
:group 'transient-faces)
(defface transient-separator
`((((class color) (background light))
,@(and (>= emacs-major-version 27) '(:extend t))
:background "grey80")
(((class color) (background dark))
,@(and (>= emacs-major-version 27) '(:extend t))
:background "grey30"))
"Face used to draw line below transient popup window.
This is only used if `transient-mode-line-format' is `line'.
Only the background color is significant."
:group 'transient-faces)
(defgroup transient-color-faces
'((transient-semantic-coloring custom-variable))
"Faces used by Transient for Hydra-like command coloring.
These faces are only used if `transient-semantic-coloring'
\(which see) is non-nil."
:group 'transient-faces)
(defface transient-red
'((t :inherit transient-key :foreground "red"))
"Face used for red prefixes and suffixes."
:group 'transient-color-faces)
(defface transient-blue
'((t :inherit transient-key :foreground "blue"))
"Face used for blue prefixes and suffixes."
:group 'transient-color-faces)
(defface transient-amaranth
'((t :inherit transient-key :foreground "#E52B50"))
"Face used for amaranth prefixes."
:group 'transient-color-faces)
(defface transient-pink
'((t :inherit transient-key :foreground "#FF6EB4"))
"Face used for pink prefixes."
:group 'transient-color-faces)
(defface transient-teal
'((t :inherit transient-key :foreground "#367588"))
"Face used for teal prefixes."
:group 'transient-color-faces)
;;; Persistence
(defun transient--read-file-contents (file)
(with-demoted-errors "Transient error: %S"
(and (file-exists-p file)
(with-temp-buffer
(insert-file-contents file)
(read (current-buffer))))))
(defun transient--pp-to-file (list file)
(make-directory (file-name-directory file) t)
(setq list (cl-sort (copy-sequence list) #'string< :key #'car))
(with-temp-file file
(let ((print-level nil)
(print-length nil))
(pp list (current-buffer)))))
(defvar transient-values
(transient--read-file-contents transient-values-file)
"Values of transient commands.
The value of this variable persists between Emacs sessions
and you usually should not change it manually.")
(defun transient-save-values ()
(transient--pp-to-file transient-values transient-values-file))
(defvar transient-levels
(transient--read-file-contents transient-levels-file)
"Levels of transient commands.
The value of this variable persists between Emacs sessions
and you usually should not change it manually.")
(defun transient-save-levels ()
(transient--pp-to-file transient-levels transient-levels-file))
(defvar transient-history
(transient--read-file-contents transient-history-file)
"History of transient commands and infix arguments.
The value of this variable persists between Emacs sessions
\(unless `transient-save-history' is nil) and you usually
should not change it manually.")
(defun transient-save-history ()
(setq transient-history
(cl-sort (mapcar (pcase-lambda (`(,key . ,val))
(cons key (seq-take (delete-dups val)
transient-history-limit)))
transient-history)
#'string< :key #'car))
(transient--pp-to-file transient-history transient-history-file))
(defun transient-maybe-save-history ()
"Save the value of `transient-history'.
If `transient-save-history' is nil, then do nothing."
(when transient-save-history
(transient-save-history)))
(unless noninteractive
(add-hook 'kill-emacs-hook 'transient-maybe-save-history))
;;; Classes
;;;; Prefix
(defclass transient-prefix ()
((prototype :initarg :prototype)
(command :initarg :command)
(level :initarg :level)
(variable :initarg :variable :initform nil)
(init-value :initarg :init-value)
(value) (default-value :initarg :value)
(scope :initarg :scope :initform nil)
(history :initarg :history :initform nil)
(history-pos :initarg :history-pos :initform 0)
(history-key :initarg :history-key :initform nil)
(man-page :initarg :man-page :initform nil)
(info-manual :initarg :info-manual :initform nil)
(transient-suffix :initarg :transient-suffix :initform nil)
(transient-non-suffix :initarg :transient-non-suffix :initform nil)
(incompatible :initarg :incompatible :initform nil)
(suffix-description :initarg :suffix-description))
"Transient prefix command.
Each transient prefix command consists of a command, which is
stored in a symbol's function slot and an object, which is
stored in the `transient--prefix' property of the same symbol.
When a transient prefix command is invoked, then a clone of that
object is stored in the global variable `transient--prefix' and
the prototype is stored in the clone's `prototype' slot.")
;;;; Suffix
(defclass transient-child ()
((level
:initarg :level
:initform (symbol-value 'transient--default-child-level)
:documentation "Enable if level of prefix is equal or greater.")
(if
:initarg :if
:initform nil
:documentation "Enable if predicate returns non-nil.")
(if-not
:initarg :if-not
:initform nil
:documentation "Enable if predicate returns nil.")
(if-non-nil
:initarg :if-non-nil
:initform nil
:documentation "Enable if variable's value is non-nil.")
(if-nil
:initarg :if-nil
:initform nil
:documentation "Enable if variable's value is nil.")
(if-mode
:initarg :if-mode
:initform nil
:documentation "Enable if major-mode matches value.")
(if-not-mode
:initarg :if-not-mode
:initform nil
:documentation "Enable if major-mode does not match value.")
(if-derived
:initarg :if-derived
:initform nil
:documentation "Enable if major-mode derives from value.")
(if-not-derived
:initarg :if-not-derived
:initform nil
:documentation "Enable if major-mode does not derive from value."))
"Abstract superclass for group and suffix classes.
It is undefined what happens if more than one `if*' predicate
slot is non-nil."
:abstract t)
(defclass transient-suffix (transient-child)
((key :initarg :key)
(command :initarg :command)
(transient :initarg :transient)
(format :initarg :format :initform " %k %d")
(description :initarg :description :initform nil)
(inapt :initform nil)
(inapt-if
:initarg :inapt-if
:initform nil
:documentation "Inapt if predicate returns non-nil.")
(inapt-if-not
:initarg :inapt-if-not
:initform nil
:documentation "Inapt if predicate returns nil.")
(inapt-if-non-nil
:initarg :inapt-if-non-nil
:initform nil
:documentation "Inapt if variable's value is non-nil.")
(inapt-if-nil
:initarg :inapt-if-nil
:initform nil
:documentation "Inapt if variable's value is nil.")
(inapt-if-mode
:initarg :inapt-if-mode
:initform nil
:documentation "Inapt if major-mode matches value.")
(inapt-if-not-mode
:initarg :inapt-if-not-mode
:initform nil
:documentation "Inapt if major-mode does not match value.")
(inapt-if-derived
:initarg :inapt-if-derived
:initform nil
:documentation "Inapt if major-mode derives from value.")
(inapt-if-not-derived
:initarg :inapt-if-not-derived
:initform nil
:documentation "Inapt if major-mode does not derive from value."))
"Superclass for suffix command.")
(defclass transient-infix (transient-suffix)
((transient :initform t)
(argument :initarg :argument)
(shortarg :initarg :shortarg)
(value :initform nil)
(init-value :initarg :init-value)
(unsavable :initarg :unsavable :initform nil)
(multi-value :initarg :multi-value :initform nil)
(always-read :initarg :always-read :initform nil)
(allow-empty :initarg :allow-empty :initform nil)
(history-key :initarg :history-key :initform nil)
(reader :initarg :reader :initform nil)
(prompt :initarg :prompt :initform nil)
(choices :initarg :choices :initform nil)
(format :initform " %k %d (%v)"))
"Transient infix command."
:abstract t)
(defclass transient-argument (transient-infix) ()
"Abstract superclass for infix arguments."
:abstract t)
(defclass transient-switch (transient-argument) ()
"Class used for command-line argument that can be turned on and off.")
(defclass transient-option (transient-argument) ()
"Class used for command-line argument that can take a value.")
(defclass transient-variable (transient-infix)
((variable :initarg :variable)
(format :initform " %k %d %v"))
"Abstract superclass for infix commands that set a variable."
:abstract t)
(defclass transient-switches (transient-argument)
((argument-format :initarg :argument-format)
(argument-regexp :initarg :argument-regexp))
"Class used for sets of mutually exclusive command-line switches.")
(defclass transient-files (transient-infix) ()
"Class used for the \"--\" argument.
All remaining arguments are treated as files.
They become the value of this argument.")
;;;; Group
(defclass transient-group (transient-child)
((suffixes :initarg :suffixes :initform nil)
(hide :initarg :hide :initform nil)
(description :initarg :description :initform nil)
(setup-children :initarg :setup-children)
(pad-keys :initarg :pad-keys))
"Abstract superclass of all group classes."
:abstract t)
(defclass transient-column (transient-group) ()
"Group class that displays each element on a separate line.")
(defclass transient-row (transient-group) ()
"Group class that displays all elements on a single line.")
(defclass transient-columns (transient-group) ()
"Group class that displays elements organized in columns.
Direct elements have to be groups whose elements have to be
commands or string. Each subgroup represents a column. This
class takes care of inserting the subgroups' elements.")
(defclass transient-subgroups (transient-group) ()
"Group class that wraps other groups.
Direct elements have to be groups whose elements have to be
commands or strings. This group inserts an empty line between
subgroups. The subgroups are responsible for displaying their
elements themselves.")
;;; Define
(defmacro transient-define-prefix (name arglist &rest args)
"Define NAME as a transient prefix command.
ARGLIST are the arguments that command takes.
DOCSTRING is the documentation string and is optional.
These arguments can optionally be followed by key-value pairs.
Each key has to be a keyword symbol, either `:class' or a keyword
argument supported by the constructor of that class. The
`transient-prefix' class is used if the class is not specified
explicitly.
GROUPs add key bindings for infix and suffix commands and specify
how these bindings are presented in the popup buffer. At least
one GROUP has to be specified. See info node `(transient)Binding
Suffix and Infix Commands'.
The BODY is optional. If it is omitted, then ARGLIST is also
ignored and the function definition becomes:
(lambda ()
(interactive)
(transient-setup \\='NAME))
If BODY is specified, then it must begin with an `interactive'
form that matches ARGLIST, and it must call `transient-setup'.
It may however call that function only when some condition is
satisfied; that is one of the reason why you might want to use
an explicit BODY.
All transients have a (possibly nil) value, which is exported
when suffix commands are called, so that they can consume that
value. For some transients it might be necessary to have a sort
of secondary value, called a scope. Such a scope would usually
be set in the commands `interactive' form and has to be passed
to the setup function:
(transient-setup \\='NAME nil nil :scope SCOPE)
\(fn NAME ARGLIST [DOCSTRING] [KEYWORD VALUE]... GROUP... [BODY...])"
(declare (debug (&define name lambda-list
[&optional lambda-doc]
[&rest keywordp sexp]
[&rest vectorp]
[&optional ("interactive" interactive) def-body]))
(indent defun)
(doc-string 3))
(pcase-let ((`(,class ,slots ,suffixes ,docstr ,body)
(transient--expand-define-args args)))
`(progn
(defalias ',name
,(if body
`(lambda ,arglist ,@body)
`(lambda ()
(interactive)
(transient-setup ',name))))
(put ',name 'interactive-only t)
(put ',name 'function-documentation ,docstr)
(put ',name 'transient--prefix
(,(or class 'transient-prefix) :command ',name ,@slots))
(put ',name 'transient--layout
',(cl-mapcan (lambda (s) (transient--parse-child name s))
suffixes)))))
(defmacro transient-define-suffix (name arglist &rest args)
"Define NAME as a transient suffix command.
ARGLIST are the arguments that the command takes.
DOCSTRING is the documentation string and is optional.
These arguments can optionally be followed by key-value pairs.
Each key has to be a keyword symbol, either `:class' or a
keyword argument supported by the constructor of that class.
The `transient-suffix' class is used if the class is not
specified explicitly.
The BODY must begin with an `interactive' form that matches
ARGLIST. The infix arguments are usually accessed by using
`transient-args' inside `interactive'.
\(fn NAME ARGLIST [DOCSTRING] [KEYWORD VALUE]... BODY...)"
(declare (debug (&define name lambda-list
[&optional lambda-doc]
[&rest keywordp sexp]
("interactive" interactive)
def-body))
(indent defun)
(doc-string 3))
(pcase-let ((`(,class ,slots ,_ ,docstr ,body)
(transient--expand-define-args args)))
`(progn
(defalias ',name (lambda ,arglist ,@body))
(put ',name 'interactive-only t)
(put ',name 'function-documentation ,docstr)
(put ',name 'transient--suffix
(,(or class 'transient-suffix) :command ',name ,@slots)))))
(defmacro transient-define-infix (name _arglist &rest args)
"Define NAME as a transient infix command.
ARGLIST is always ignored and reserved for future use.
DOCSTRING is the documentation string and is optional.
The key-value pairs are mandatory. All transient infix commands
are equal to each other (but not eq), so it is meaningless to
define an infix command without also setting at least `:class'
and one other keyword (which it is depends on the used class,
usually `:argument' or `:variable').
Each key has to be a keyword symbol, either `:class' or a keyword
argument supported by the constructor of that class. The
`transient-switch' class is used if the class is not specified
explicitly.
The function definitions is always:
(lambda ()
(interactive)
(let ((obj (transient-suffix-object)))
(transient-infix-set obj (transient-infix-read obj)))
(transient--show))
`transient-infix-read' and `transient-infix-set' are generic
functions. Different infix commands behave differently because
the concrete methods are different for different infix command
classes. In rare case the above command function might not be
suitable, even if you define your own infix command class. In
that case you have to use `transient-suffix-command' to define
the infix command and use t as the value of the `:transient'
keyword.
\(fn NAME ARGLIST [DOCSTRING] [KEYWORD VALUE]...)"
(declare (debug (&define name lambda-list
[&optional lambda-doc]
[&rest keywordp sexp]))
(indent defun)
(doc-string 3))
(pcase-let ((`(,class ,slots ,_ ,docstr ,_)
(transient--expand-define-args args)))
`(progn
(defalias ',name ,(transient--default-infix-command))
(put ',name 'interactive-only t)
(put ',name 'function-documentation ,docstr)
(put ',name 'transient--suffix
(,(or class 'transient-switch) :command ',name ,@slots)))))
(defalias 'transient-define-argument 'define-infix-command
"Define NAME as a transient infix command.
Only use this alias to define an infix command that actually
sets an infix argument. To define a infix command that, for
example, sets a variable use `transient-define-infix' instead.
\(fn NAME ARGLIST [DOCSTRING] [KEYWORD VALUE]...)")
(defun transient--expand-define-args (args)
(let (class keys suffixes docstr)
(when (stringp (car args))
(setq docstr (pop args)))
(while (keywordp (car args))
(let ((k (pop args))
(v (pop args)))
(if (eq k :class)
(setq class v)
(push k keys)
(push v keys))))
(while (let ((arg (car args)))
(or (vectorp arg)
(and arg (symbolp arg))))
(push (pop args) suffixes))
(list (if (eq (car-safe class) 'quote)
(cadr class)
class)
(nreverse keys)
(nreverse suffixes)
docstr
args)))
(defun transient--parse-child (prefix spec)
(cl-etypecase spec
(symbol (let ((value (symbol-value spec)))
(if (and (listp value)
(or (listp (car value))
(vectorp (car value))))
(cl-mapcan (lambda (s) (transient--parse-child prefix s)) value)
(transient--parse-child prefix value))))
(vector (when-let ((c (transient--parse-group prefix spec))) (list c)))
(list (when-let ((c (transient--parse-suffix prefix spec))) (list c)))
(string (list spec))))
(defun transient--parse-group (prefix spec)
(setq spec (append spec nil))
(cl-symbol-macrolet
((car (car spec))
(pop (pop spec)))
(let (level class args)
(when (integerp car)
(setq level pop))
(when (stringp car)
(setq args (plist-put args :description pop)))
(while (keywordp car)
(let ((k pop))
(if (eq k :class)
(setq class pop)
(setq args (plist-put args k pop)))))
(vector (or level transient--default-child-level)
(or class
(if (vectorp car)
'transient-columns
'transient-column))
args
(cl-mapcan (lambda (s) (transient--parse-child prefix s)) spec)))))
(defun transient--parse-suffix (prefix spec)
(let (level class args)
(cl-symbol-macrolet
((car (car spec))
(pop (pop spec)))
(when (integerp car)
(setq level pop))
(when (or (stringp car)
(vectorp car))
(setq args (plist-put args :key pop)))
(when (or (stringp car)
(eq (car-safe car) 'lambda)
(and (symbolp car)
(not (commandp car))
(commandp (cadr spec))))
(setq args (plist-put args :description pop)))
(cond
((keywordp car)
(error "Need command, got %S" car))
((symbolp car)
(setq args (plist-put args :command pop)))