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guix/emacs/guix-buffer.el
Alex Kost 0338132e65 emacs: Set 'guix-buffer-item' before displaying entries. 
* emacs/guix-buffer.el (guix-buffer-set): Set 'guix-buffer-item' early,
  so that it can be used during displaying entries.  For example, this
  allows us to use a value of the current guix profile when package
  entries are inserted in a "List" or "Info" buffer.
2016-02-22 22:29:56 +03:00

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;;; guix-buffer.el --- Buffer interface for displaying data -*- lexical-binding: t -*-
;; Copyright © 2014, 2015 Alex Kost <alezost@gmail.com>
;; This file is part of GNU Guix.
;; GNU Guix 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 Guix 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This file provides a general 'buffer' interface for displaying an
;; arbitrary data.
;;; Code:
(require 'cl-lib)
(require 'guix-history)
(require 'guix-utils)
(defvar guix-buffer-map
(let ((map (make-sparse-keymap)))
(define-key map (kbd "l") 'guix-history-back)
(define-key map (kbd "r") 'guix-history-forward)
(define-key map (kbd "g") 'revert-buffer)
(define-key map (kbd "R") 'guix-buffer-redisplay)
map)
"Parent keymap for Guix buffer modes.")
;;; Buffer item
(cl-defstruct (guix-buffer-item
(:constructor nil)
(:constructor guix-buffer-make-item
(entries buffer-type entry-type args))
(:copier nil))
entries buffer-type entry-type args)
(defvar-local guix-buffer-item nil
"Data (structure) for the current Guix buffer.
The structure consists of the following elements:
- `entries': list of the currently displayed entries.
Each element of the list is an alist with an entry data of the
following form:
((PARAM . VAL) ...)
PARAM is a name of the entry parameter.
VAL is a value of this parameter.
- `entry-type': type of the currently displayed entries.
- `buffer-type': type of the current buffer.
- `args': search arguments used to get the current entries.")
(put 'guix-buffer-item 'permanent-local t)
(defmacro guix-buffer-with-item (item &rest body)
"Evaluate BODY using buffer ITEM.
The following local variables are available inside BODY:
`%entries', `%buffer-type', `%entry-type', `%args'.
See `guix-buffer-item' for details."
(declare (indent 1) (debug t))
(let ((item-var (make-symbol "item")))
`(let ((,item-var ,item))
(let ((%entries (guix-buffer-item-entries ,item-var))
(%buffer-type (guix-buffer-item-buffer-type ,item-var))
(%entry-type (guix-buffer-item-entry-type ,item-var))
(%args (guix-buffer-item-args ,item-var)))
,@body))))
(defmacro guix-buffer-with-current-item (&rest body)
"Evaluate BODY using `guix-buffer-item'.
See `guix-buffer-with-item' for details."
(declare (indent 0) (debug t))
`(guix-buffer-with-item guix-buffer-item
,@body))
(defmacro guix-buffer-define-current-item-accessor (name)
"Define `guix-buffer-current-NAME' function to access NAME
element of `guix-buffer-item' structure.
NAME should be a symbol."
(let* ((name-str (symbol-name name))
(accessor (intern (concat "guix-buffer-item-" name-str)))
(fun-name (intern (concat "guix-buffer-current-" name-str)))
(doc (format "\
Return '%s' of the current Guix buffer.
See `guix-buffer-item' for details."
name-str)))
`(defun ,fun-name ()
,doc
(and guix-buffer-item
(,accessor guix-buffer-item)))))
(defmacro guix-buffer-define-current-item-accessors (&rest names)
"Define `guix-buffer-current-NAME' functions for NAMES.
See `guix-buffer-define-current-item-accessor' for details."
`(progn
,@(mapcar (lambda (name)
`(guix-buffer-define-current-item-accessor ,name))
names)))
(guix-buffer-define-current-item-accessors
entries entry-type buffer-type args)
(defmacro guix-buffer-define-current-args-accessor (n prefix name)
"Define `PREFIX-NAME' function to access Nth element of 'args'
field of `guix-buffer-item' structure.
PREFIX and NAME should be strings."
(let ((fun-name (intern (concat prefix "-" name)))
(doc (format "\
Return '%s' of the current Guix buffer.
'%s' is the element number %d in 'args' of `guix-buffer-item'."
name name n)))
`(defun ,fun-name ()
,doc
(nth ,n (guix-buffer-current-args)))))
(defmacro guix-buffer-define-current-args-accessors (prefix &rest names)
"Define `PREFIX-NAME' functions for NAMES.
See `guix-buffer-define-current-args-accessor' for details."
`(progn
,@(cl-loop for name in names
for i from 0
collect `(guix-buffer-define-current-args-accessor
,i ,prefix ,name))))
;;; Wrappers for defined variables
(defvar guix-buffer-data nil
"Alist with 'buffer' data.
This alist is filled by `guix-buffer-define-interface' macro.")
(defun guix-buffer-value (buffer-type entry-type symbol)
"Return SYMBOL's value for BUFFER-TYPE/ENTRY-TYPE from `guix-buffer-data'."
(symbol-value
(guix-assq-value guix-buffer-data buffer-type entry-type symbol)))
(defun guix-buffer-get-entries (buffer-type entry-type args)
"Return ENTRY-TYPE entries.
Call an appropriate 'get-entries' function from `guix-buffer'
using ARGS as its arguments."
(apply (guix-buffer-value buffer-type entry-type 'get-entries)
args))
(defun guix-buffer-mode-enable (buffer-type entry-type)
"Turn on major mode to display ENTRY-TYPE ENTRIES in BUFFER-TYPE buffer."
(funcall (guix-buffer-value buffer-type entry-type 'mode)))
(defun guix-buffer-mode-initialize (buffer-type entry-type)
"Set up the current BUFFER-TYPE buffer to display ENTRY-TYPE entries."
(let ((fun (guix-buffer-value buffer-type entry-type 'mode-init)))
(when fun
(funcall fun))))
(defun guix-buffer-insert-entries (entries buffer-type entry-type)
"Show ENTRY-TYPE ENTRIES in the current BUFFER-TYPE buffer."
(funcall (guix-buffer-value buffer-type entry-type 'insert-entries)
entries))
(defun guix-buffer-show-entries-default (entries buffer-type entry-type)
"Show ENTRY-TYPE ENTRIES in the current BUFFER-TYPE buffer."
(let ((inhibit-read-only t))
(erase-buffer)
(guix-buffer-mode-enable buffer-type entry-type)
(guix-buffer-insert-entries entries buffer-type entry-type)
(goto-char (point-min))))
(defun guix-buffer-show-entries (entries buffer-type entry-type)
"Show ENTRY-TYPE ENTRIES in the current BUFFER-TYPE buffer."
(funcall (guix-buffer-value buffer-type entry-type 'show-entries)
entries))
(defun guix-buffer-message (entries buffer-type entry-type args)
"Display a message for BUFFER-ITEM after showing entries."
(let ((fun (guix-buffer-value buffer-type entry-type 'message)))
(when fun
(apply fun entries args))))
(defun guix-buffer-name (buffer-type entry-type args)
"Return name of BUFFER-TYPE buffer for displaying ENTRY-TYPE entries."
(let ((str-or-fun (guix-buffer-value buffer-type entry-type
'buffer-name)))
(if (stringp str-or-fun)
str-or-fun
(apply str-or-fun args))))
(defun guix-buffer-param-title (buffer-type entry-type param)
"Return PARAM title for BUFFER-TYPE/ENTRY-TYPE."
(or (guix-assq-value (guix-buffer-value buffer-type entry-type 'titles)
param)
;; Fallback to a title defined in 'info' interface.
(unless (eq buffer-type 'info)
(guix-assq-value (guix-buffer-value 'info entry-type 'titles)
param))
(guix-symbol-title param)))
(defun guix-buffer-history-size (buffer-type entry-type)
"Return history size for BUFFER-TYPE/ENTRY-TYPE."
(guix-buffer-value buffer-type entry-type 'history-size))
(defun guix-buffer-revert-confirm? (buffer-type entry-type)
"Return 'revert-confirm' value for BUFFER-TYPE/ENTRY-TYPE."
(guix-buffer-value buffer-type entry-type 'revert-confirm))
;;; Displaying entries
(defun guix-buffer-display (buffer)
"Switch to a Guix BUFFER."
(pop-to-buffer buffer
'((display-buffer-reuse-window
display-buffer-same-window))))
(defun guix-buffer-history-item (buffer-item)
"Make and return a history item for displaying BUFFER-ITEM."
(list #'guix-buffer-set buffer-item))
(defun guix-buffer-set (buffer-item &optional history)
"Set up the current buffer for displaying BUFFER-ITEM.
HISTORY should be one of the following:
`nil' - do not save BUFFER-ITEM in history,
`add' - add it to history,
`replace' - replace the current history item."
(guix-buffer-with-item buffer-item
(when %entries
;; Set buffer item before showing entries, so that its value can
;; be used by the code for displaying entries.
(setq guix-buffer-item buffer-item)
(guix-buffer-show-entries %entries %buffer-type %entry-type)
(when history
(funcall (cl-ecase history
(add #'guix-history-add)
(replace #'guix-history-replace))
(guix-buffer-history-item buffer-item))))
(guix-buffer-message %entries %buffer-type %entry-type %args)))
(defun guix-buffer-display-entries-current
(entries buffer-type entry-type args &optional history)
"Show ENTRIES in the current Guix buffer.
See `guix-buffer-item' for the meaning of BUFFER-TYPE, ENTRY-TYPE
and ARGS, and `guix-buffer-set' for the meaning of HISTORY."
(let ((item (guix-buffer-make-item entries buffer-type
entry-type args)))
(guix-buffer-set item history)))
(defun guix-buffer-get-display-entries-current
(buffer-type entry-type args &optional history)
"Search for entries and show them in the current Guix buffer.
See `guix-buffer-display-entries-current' for details."
(guix-buffer-display-entries-current
(guix-buffer-get-entries buffer-type entry-type args)
buffer-type entry-type args history))
(defun guix-buffer-display-entries
(entries buffer-type entry-type args &optional history)
"Show ENTRIES in a BUFFER-TYPE buffer.
See `guix-buffer-display-entries-current' for details."
(let ((buffer (get-buffer-create
(guix-buffer-name buffer-type entry-type args))))
(with-current-buffer buffer
(guix-buffer-display-entries-current
entries buffer-type entry-type args history))
(when entries
(guix-buffer-display buffer))))
(defun guix-buffer-get-display-entries
(buffer-type entry-type args &optional history)
"Search for entries and show them in a BUFFER-TYPE buffer.
See `guix-buffer-display-entries-current' for details."
(guix-buffer-display-entries
(guix-buffer-get-entries buffer-type entry-type args)
buffer-type entry-type args history))
(defun guix-buffer-revert (_ignore-auto noconfirm)
"Update the data in the current Guix buffer.
This function is suitable for `revert-buffer-function'.
See `revert-buffer' for the meaning of NOCONFIRM."
(guix-buffer-with-current-item
(when (or noconfirm
(not (guix-buffer-revert-confirm? %buffer-type %entry-type))
(y-or-n-p "Update the current buffer? "))
(guix-buffer-get-display-entries-current
%buffer-type %entry-type %args 'replace))))
(defvar guix-buffer-after-redisplay-hook nil
"Hook run by `guix-buffer-redisplay'.
This hook is called before seting up a window position.")
(defun guix-buffer-redisplay ()
"Redisplay the current Guix buffer.
Restore the point and window positions after redisplaying.
This function does not update the buffer data, use
'\\[revert-buffer]' if you want the full update."
(interactive)
(let* ((old-point (point))
;; For simplicity, ignore an unlikely case when multiple
;; windows display the same buffer.
(window (car (get-buffer-window-list (current-buffer) nil t)))
(window-start (and window (window-start window))))
(guix-buffer-set guix-buffer-item)
(goto-char old-point)
(run-hooks 'guix-buffer-after-redisplay-hook)
(when window
(set-window-point window (point))
(set-window-start window window-start))))
(defun guix-buffer-redisplay-goto-button ()
"Redisplay the current buffer and go to the next button, if needed."
(let ((guix-buffer-after-redisplay-hook
(cons (lambda ()
(unless (button-at (point))
(forward-button 1)))
guix-buffer-after-redisplay-hook)))
(guix-buffer-redisplay)))
;;; Interface definers
(defmacro guix-define-groups (type &rest args)
"Define `guix-TYPE' and `guix-TYPE-faces' custom groups.
Remaining arguments (ARGS) should have a form [KEYWORD VALUE] ...
Optional keywords:
- `:parent-group' - name of a parent custom group.
- `:parent-faces-group' - name of a parent custom faces group.
- `:group-doc' - docstring of a `guix-TYPE' group.
- `:faces-group-doc' - docstring of a `guix-TYPE-faces' group."
(declare (indent 1))
(let* ((type-str (symbol-name type))
(prefix (concat "guix-" type-str))
(group (intern prefix))
(faces-group (intern (concat prefix "-faces"))))
(guix-keyword-args-let args
((parent-group :parent-group 'guix)
(parent-faces-group :parent-faces-group 'guix-faces)
(group-doc :group-doc
(format "Settings for '%s' buffers."
type-str))
(faces-group-doc :faces-group-doc
(format "Faces for '%s' buffers."
type-str)))
`(progn
(defgroup ,group nil
,group-doc
:group ',parent-group)
(defgroup ,faces-group nil
,faces-group-doc
:group ',group
:group ',parent-faces-group)))))
(defmacro guix-define-entry-type (entry-type &rest args)
"Define general code for ENTRY-TYPE.
See `guix-define-groups'."
(declare (indent 1))
`(guix-define-groups ,entry-type
,@args))
(defmacro guix-define-buffer-type (buffer-type &rest args)
"Define general code for BUFFER-TYPE.
See `guix-define-groups'."
(declare (indent 1))
`(guix-define-groups ,buffer-type
,@args))
(defmacro guix-buffer-define-interface (buffer-type entry-type &rest args)
"Define BUFFER-TYPE interface for displaying ENTRY-TYPE entries.
Remaining arguments (ARGS) should have a form [KEYWORD VALUE] ...
In the following description TYPE means ENTRY-TYPE-BUFFER-TYPE.
Required keywords:
- `:buffer-name' - default value of the generated
`guix-TYPE-buffer-name' variable.
- `:get-entries-function' - default value of the generated
`guix-TYPE-get-function' variable.
- `:show-entries-function' - default value of the generated
`guix-TYPE-show-function' variable.
Alternatively, if `:show-entries-function' is not specified, a
default `guix-TYPE-show-entries' will be generated, and the
following keyword should be specified instead:
- `:insert-entries-function' - default value of the generated
`guix-TYPE-insert-function' variable.
Optional keywords:
- `:message-function' - default value of the generated
`guix-TYPE-message-function' variable.
- `:titles' - default value of the generated
`guix-TYPE-titles' variable.
- `:history-size' - default value of the generated
`guix-TYPE-history-size' variable.
- `:revert-confirm?' - default value of the generated
`guix-TYPE-revert-confirm' variable.
- `:mode-name' - name (a string appeared in the mode-line) of
the generated `guix-TYPE-mode'.
- `:mode-init-function' - default value of the generated
`guix-TYPE-mode-initialize-function' variable.
- `:reduced?' - if non-nil, generate only group, faces group
and titles variable (if specified); all keywords become
optional."
(declare (indent 2))
(let* ((entry-type-str (symbol-name entry-type))
(buffer-type-str (symbol-name buffer-type))
(prefix (concat "guix-" entry-type-str "-"
buffer-type-str))
(group (intern prefix))
(faces-group (intern (concat prefix "-faces")))
(get-entries-var (intern (concat prefix "-get-function")))
(show-entries-var (intern (concat prefix "-show-function")))
(show-entries-fun (intern (concat prefix "-show-entries")))
(message-var (intern (concat prefix "-message-function")))
(buffer-name-var (intern (concat prefix "-buffer-name")))
(titles-var (intern (concat prefix "-titles")))
(history-size-var (intern (concat prefix "-history-size")))
(revert-confirm-var (intern (concat prefix "-revert-confirm"))))
(guix-keyword-args-let args
((get-entries-val :get-entries-function)
(show-entries-val :show-entries-function)
(insert-entries-val :insert-entries-function)
(mode-name :mode-name (capitalize prefix))
(mode-init-val :mode-init-function)
(message-val :message-function)
(buffer-name-val :buffer-name)
(titles-val :titles)
(history-size-val :history-size 20)
(revert-confirm-val :revert-confirm? t)
(reduced? :reduced?))
`(progn
(defgroup ,group nil
,(format "Displaying '%s' entries in '%s' buffer."
entry-type-str buffer-type-str)
:group ',(intern (concat "guix-" entry-type-str))
:group ',(intern (concat "guix-" buffer-type-str)))
(defgroup ,faces-group nil
,(format "Faces for displaying '%s' entries in '%s' buffer."
entry-type-str buffer-type-str)
:group ',group
:group ',(intern (concat "guix-" entry-type-str "-faces"))
:group ',(intern (concat "guix-" buffer-type-str "-faces")))
(defcustom ,titles-var ,titles-val
,(format "Alist of titles of '%s' parameters."
entry-type-str)
:type '(alist :key-type symbol :value-type string)
:group ',group)
,(unless reduced?
`(progn
(defvar ,get-entries-var ,get-entries-val
,(format "\
Function used to receive '%s' entries for '%s' buffer."
entry-type-str buffer-type-str))
(defvar ,show-entries-var
,(or show-entries-val `',show-entries-fun)
,(format "\
Function used to show '%s' entries in '%s' buffer."
entry-type-str buffer-type-str))
(defvar ,message-var ,message-val
,(format "\
Function used to display a message after showing '%s' entries.
If nil, do not display messages."
entry-type-str))
(defcustom ,buffer-name-var ,buffer-name-val
,(format "\
Default name of '%s' buffer for displaying '%s' entries.
May be a string or a function returning a string. The function
is called with the same arguments as `%S'."
buffer-type-str entry-type-str get-entries-var)
:type '(choice string function)
:group ',group)
(defcustom ,history-size-var ,history-size-val
,(format "\
Maximum number of items saved in history of `%S' buffer.
If 0, the history is disabled."
buffer-name-var)
:type 'integer
:group ',group)
(defcustom ,revert-confirm-var ,revert-confirm-val
,(format "\
If non-nil, ask to confirm for reverting `%S' buffer."
buffer-name-var)
:type 'boolean
:group ',group)
(guix-alist-put!
'((get-entries . ,get-entries-var)
(show-entries . ,show-entries-var)
(message . ,message-var)
(buffer-name . ,buffer-name-var)
(history-size . ,history-size-var)
(revert-confirm . ,revert-confirm-var))
'guix-buffer-data ',buffer-type ',entry-type)
,(unless show-entries-val
`(defun ,show-entries-fun (entries)
,(format "\
Show '%s' ENTRIES in the current '%s' buffer."
entry-type-str buffer-type-str)
(guix-buffer-show-entries-default
entries ',buffer-type ',entry-type)))
,(when (or insert-entries-val
(null show-entries-val))
(let ((insert-entries-var
(intern (concat prefix "-insert-function"))))
`(progn
(defvar ,insert-entries-var ,insert-entries-val
,(format "\
Function used to print '%s' entries in '%s' buffer."
entry-type-str buffer-type-str))
(guix-alist-put!
',insert-entries-var 'guix-buffer-data
',buffer-type ',entry-type
'insert-entries))))
,(when (or mode-name
mode-init-val
(null show-entries-val))
(let* ((mode-str (concat prefix "-mode"))
(mode-map-str (concat mode-str "-map"))
(mode (intern mode-str))
(parent-mode (intern
(concat "guix-" buffer-type-str
"-mode")))
(mode-var (intern
(concat mode-str "-function")))
(mode-init-var (intern
(concat mode-str
"-initialize-function"))))
`(progn
(defvar ,mode-var ',mode
,(format "\
Major mode for displaying '%s' entries in '%s' buffer."
entry-type-str buffer-type-str))
(defvar ,mode-init-var ,mode-init-val
,(format "\
Function used to set up '%s' buffer for displaying '%s' entries."
buffer-type-str entry-type-str))
(define-derived-mode ,mode ,parent-mode ,mode-name
,(format "\
Major mode for displaying '%s' entries in '%s' buffer.
\\{%s}"
entry-type-str buffer-type-str mode-map-str)
(setq-local revert-buffer-function
'guix-buffer-revert)
(setq-local guix-history-size
(guix-buffer-history-size
',buffer-type ',entry-type))
(guix-buffer-mode-initialize
',buffer-type ',entry-type))
(guix-alist-put!
',mode-var 'guix-buffer-data
',buffer-type ',entry-type 'mode)
(guix-alist-put!
',mode-init-var 'guix-buffer-data
',buffer-type ',entry-type
'mode-init))))))
(guix-alist-put!
',titles-var 'guix-buffer-data
',buffer-type ',entry-type 'titles)))))
(defvar guix-buffer-font-lock-keywords
(eval-when-compile
`((,(rx "(" (group (or "guix-buffer-with-item"
"guix-buffer-with-current-item"
"guix-buffer-define-interface"
"guix-define-groups"
"guix-define-entry-type"
"guix-define-buffer-type"))
symbol-end)
. 1))))
(font-lock-add-keywords 'emacs-lisp-mode guix-buffer-font-lock-keywords)
(provide 'guix-buffer)
;;; guix-buffer.el ends here
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