guix-devel/emacs/guix-info.el

483 lines
17 KiB
EmacsLisp
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

;;; guix-info.el --- 'Info' buffer interface for displaying data -*- lexical-binding: t -*-
;; Copyright © 2014, 2015 Alex Kost <alezost@gmail.com>
;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
;; 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 'info' (help-like) buffer interface for displaying
;; an arbitrary data.
;;; Code:
(require 'guix-buffer)
(require 'guix-entry)
(require 'guix-utils)
(guix-define-buffer-type info)
(defface guix-info-heading
'((((type tty pc) (class color)) :weight bold)
(t :height 1.6 :weight bold :inherit variable-pitch))
"Face for headings."
:group 'guix-info-faces)
(defface guix-info-param-title
'((t :inherit font-lock-type-face))
"Face used for titles of parameters."
:group 'guix-info-faces)
(defface guix-info-file-name
'((t :inherit link))
"Face used for file names."
:group 'guix-info-faces)
(defface guix-info-url
'((t :inherit link))
"Face used for URLs."
:group 'guix-info-faces)
(defface guix-info-time
'((t :inherit font-lock-constant-face))
"Face used for timestamps."
:group 'guix-info-faces)
(defface guix-info-action-button
'((((type x w32 ns) (class color))
:box (:line-width 2 :style released-button)
:background "lightgrey" :foreground "black")
(t :inherit button))
"Face used for action buttons."
:group 'guix-info-faces)
(defface guix-info-action-button-mouse
'((((type x w32 ns) (class color))
:box (:line-width 2 :style released-button)
:background "grey90" :foreground "black")
(t :inherit highlight))
"Mouse face used for action buttons."
:group 'guix-info-faces)
(defcustom guix-info-ignore-empty-values nil
"If non-nil, do not display parameters with nil values."
:type 'boolean
:group 'guix-info)
(defcustom guix-info-fill t
"If non-nil, fill string parameters to fit the window.
If nil, insert text parameters (like synopsis or description) in
a raw form."
:type 'boolean
:group 'guix-info)
(defvar guix-info-param-title-format "%-18s: "
"String used to format a title of a parameter.
It should be a '%s'-sequence. After inserting a title formatted
with this string, a value of the parameter is inserted.
This string is used by `guix-info-insert-title-format'.")
(defvar guix-info-multiline-prefix
(make-string (length (format guix-info-param-title-format " "))
?\s)
"String used to format multi-line parameter values.
If a value occupies more than one line, this string is inserted
in the beginning of each line after the first one.
This string is used by `guix-info-insert-value-format'.")
(defvar guix-info-indent 2
"Number of spaces used to indent various parts of inserted text.")
(defvar guix-info-delimiter "\n\f\n"
"String used to separate entries.")
;;; Wrappers for 'info' variables
(defvar guix-info-data nil
"Alist with 'info' data.
This alist is filled by `guix-info-define-interface' macro.")
(defun guix-info-value (entry-type symbol)
"Return SYMBOL's value for ENTRY-TYPE from `guix-info-data'."
(symbol-value (guix-assq-value guix-info-data entry-type symbol)))
(defun guix-info-param-title (entry-type param)
"Return a title of an ENTRY-TYPE parameter PARAM."
(guix-buffer-param-title 'info entry-type param))
(defun guix-info-format (entry-type)
"Return 'info' format for ENTRY-TYPE."
(guix-info-value entry-type 'format))
(defun guix-info-displayed-params (entry-type)
"Return a list of ENTRY-TYPE parameters that should be displayed."
(delq nil
(mapcar (lambda (spec)
(pcase spec
(`(,param . ,_) param)))
(guix-info-format entry-type))))
;;; Inserting entries
(defvar guix-info-title-aliases
'((format . guix-info-insert-title-format)
(simple . guix-info-insert-title-simple))
"Alist of aliases and functions to insert titles.")
(defvar guix-info-value-aliases
'((format . guix-info-insert-value-format)
(indent . guix-info-insert-value-indent)
(simple . guix-info-insert-value-simple)
(time . guix-info-insert-time))
"Alist of aliases and functions to insert values.")
(defun guix-info-title-function (fun-or-alias)
"Convert FUN-OR-ALIAS into a function to insert a title."
(or (guix-assq-value guix-info-title-aliases fun-or-alias)
fun-or-alias))
(defun guix-info-value-function (fun-or-alias)
"Convert FUN-OR-ALIAS into a function to insert a value."
(or (guix-assq-value guix-info-value-aliases fun-or-alias)
fun-or-alias))
(defun guix-info-title-method->function (method)
"Convert title METHOD into a function to insert a title."
(pcase method
((pred null) #'ignore)
((pred symbolp) (guix-info-title-function method))
(`(,fun-or-alias . ,rest-args)
(lambda (title)
(apply (guix-info-title-function fun-or-alias)
title rest-args)))
(_ (error "Unknown title method '%S'" method))))
(defun guix-info-value-method->function (method)
"Convert value METHOD into a function to insert a value."
(pcase method
((pred null) #'ignore)
((pred functionp) method)
(`(,fun-or-alias . ,rest-args)
(lambda (value _)
(apply (guix-info-value-function fun-or-alias)
value rest-args)))
(_ (error "Unknown value method '%S'" method))))
(defun guix-info-fill-column ()
"Return fill column for the current window."
(min (window-width) fill-column))
(defun guix-info-get-indent (&optional level)
"Return `guix-info-indent' \"multiplied\" by LEVEL spaces.
LEVEL is 1 by default."
(make-string (* guix-info-indent (or level 1)) ?\s))
(defun guix-info-insert-indent (&optional level)
"Insert `guix-info-indent' spaces LEVEL times (1 by default)."
(insert (guix-info-get-indent level)))
(defun guix-info-insert-entries (entries entry-type)
"Display ENTRY-TYPE ENTRIES in the current info buffer."
(guix-mapinsert (lambda (entry)
(guix-info-insert-entry entry entry-type))
entries
guix-info-delimiter))
(defun guix-info-insert-entry (entry entry-type &optional indent-level)
"Insert ENTRY of ENTRY-TYPE into the current info buffer.
If INDENT-LEVEL is non-nil, indent displayed data by this number
of `guix-info-indent' spaces."
(guix-with-indent (* (or indent-level 0)
guix-info-indent)
(dolist (spec (guix-info-format entry-type))
(guix-info-insert-entry-unit spec entry entry-type))))
(defun guix-info-insert-entry-unit (format-spec entry entry-type)
"Insert title and value of a PARAM at point.
ENTRY is alist with parameters and their values.
ENTRY-TYPE is a type of ENTRY."
(pcase format-spec
((pred functionp)
(funcall format-spec entry)
(insert "\n"))
(`(,param ,title-method ,value-method)
(let ((value (guix-entry-value entry param)))
(unless (and guix-info-ignore-empty-values (null value))
(let ((title (guix-info-param-title entry-type param))
(insert-title (guix-info-title-method->function title-method))
(insert-value (guix-info-value-method->function value-method)))
(funcall insert-title title)
(funcall insert-value value entry)
(insert "\n")))))
(_ (error "Unknown format specification '%S'" format-spec))))
(defun guix-info-insert-title-simple (title &optional face)
"Insert \"TITLE: \" string at point.
If FACE is nil, use `guix-info-param-title'."
(guix-format-insert title
(or face 'guix-info-param-title)
"%s: "))
(defun guix-info-insert-title-format (title &optional face)
"Insert TITLE using `guix-info-param-title-format' at point.
If FACE is nil, use `guix-info-param-title'."
(guix-format-insert title
(or face 'guix-info-param-title)
guix-info-param-title-format))
(defun guix-info-insert-value-simple (value &optional button-or-face indent)
"Format and insert parameter VALUE at point.
VALUE may be split into several short lines to fit the current
window, depending on `guix-info-fill', and each line is indented
with INDENT number of spaces.
If BUTTON-OR-FACE is a button type symbol, transform VALUE into
this (these) button(s) and insert each one on a new line. If it
is a face symbol, propertize inserted line(s) with this face."
(or indent (setq indent 0))
(guix-with-indent indent
(let* ((button? (guix-button-type? button-or-face))
(face (unless button? button-or-face))
(fill-col (unless (or button?
(and (stringp value)
(not guix-info-fill)))
(- (guix-info-fill-column) indent)))
(value (if (and value button?)
(guix-buttonize value button-or-face "\n")
value)))
(guix-split-insert value face fill-col "\n"))))
(defun guix-info-insert-value-indent (value &optional button-or-face)
"Format and insert parameter VALUE at point.
This function is intended to be called after inserting a title
with `guix-info-insert-title-simple'.
VALUE may be split into several short lines to fit the current
window, depending on `guix-info-fill', and each line is indented
with `guix-info-indent'.
For the meaning of BUTTON-OR-FACE, see `guix-info-insert-value-simple'."
(when value (insert "\n"))
(guix-info-insert-value-simple value button-or-face guix-info-indent))
(defun guix-info-insert-value-format (value &optional button-or-face
&rest button-properties)
"Format and insert parameter VALUE at point.
This function is intended to be called after inserting a title
with `guix-info-insert-title-format'.
VALUE may be split into several short lines to fit the current
window, depending on `guix-info-fill' and
`guix-info-multiline-prefix'. If VALUE is a list, its elements
will be separated with `guix-list-separator'.
If BUTTON-OR-FACE is a button type symbol, transform VALUE into
this (these) button(s). If it is a face symbol, propertize
inserted line(s) with this face.
BUTTON-PROPERTIES are passed to `guix-buttonize' (only if
BUTTON-OR-FACE is a button type)."
(let* ((button? (guix-button-type? button-or-face))
(face (unless button? button-or-face))
(fill-col (when (or button?
guix-info-fill
(not (stringp value)))
(- (guix-info-fill-column)
(length guix-info-multiline-prefix))))
(value (if (and value button?)
(apply #'guix-buttonize
value button-or-face guix-list-separator
button-properties)
value)))
(guix-split-insert value face fill-col
(concat "\n" guix-info-multiline-prefix))))
(defun guix-info-insert-time (seconds &optional face)
"Insert formatted time string using SECONDS at point."
(guix-format-insert (guix-get-time-string seconds)
(or face 'guix-info-time)))
;;; Buttons
(defvar guix-info-button-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map button-map)
(define-key map (kbd "c") 'guix-info-button-copy-label)
map)
"Keymap for buttons in info buffers.")
(define-button-type 'guix
'keymap guix-info-button-map
'follow-link t)
(define-button-type 'guix-action
:supertype 'guix
'face 'guix-info-action-button
'mouse-face 'guix-info-action-button-mouse)
(define-button-type 'guix-file
:supertype 'guix
'face 'guix-info-file-name
'help-echo "Find file"
'action (lambda (btn)
(guix-find-file (button-label btn))))
(define-button-type 'guix-url
:supertype 'guix
'face 'guix-info-url
'help-echo "Browse URL"
'action (lambda (btn)
(browse-url (button-label btn))))
(defun guix-info-button-copy-label (&optional pos)
"Copy a label of the button at POS into kill ring.
If POS is nil, use the current point position."
(interactive)
(let ((button (button-at (or pos (point)))))
(when button
(guix-copy-as-kill (button-label button)))))
(defun guix-info-insert-action-button (label action &optional message
&rest properties)
"Make action button with LABEL and insert it at point.
ACTION is a function called when the button is pressed. It
should accept button as the argument.
MESSAGE is a button message.
See `insert-text-button' for the meaning of PROPERTIES."
(apply #'guix-insert-button
label 'guix-action
'action action
'help-echo message
properties))
;;; Major mode and interface definer
(defvar guix-info-mode-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent
map (make-composed-keymap (list guix-buffer-map button-buffer-map)
special-mode-map))
map)
"Keymap for `guix-info-mode' buffers.")
(define-derived-mode guix-info-mode special-mode "Guix-Info"
"Parent mode for displaying data in 'info' form."
(setq-local revert-buffer-function 'guix-buffer-revert))
(defun guix-info-mode-initialize ()
"Set up the current 'info' buffer."
;; Without this, syntactic fontification is performed, and it may
;; break our highlighting. For example, description of "emacs-typo"
;; package contains a single " (double-quote) character, so the
;; default syntactic fontification highlights the rest text after it
;; as a string. See (info "(elisp) Font Lock Basics") for details.
(setq font-lock-defaults '(nil t)))
(defmacro guix-info-define-interface (entry-type &rest args)
"Define 'info' interface for displaying ENTRY-TYPE entries.
Remaining arguments (ARGS) should have a form [KEYWORD VALUE] ...
Required keywords:
- `:format' - default value of the generated
`guix-ENTRY-TYPE-info-format' variable.
The rest keyword arguments are passed to
`guix-buffer-define-interface' macro."
(declare (indent 1))
(let* ((entry-type-str (symbol-name entry-type))
(prefix (concat "guix-" entry-type-str "-info"))
(group (intern prefix))
(format-var (intern (concat prefix "-format"))))
(guix-keyword-args-let args
((show-entries-val :show-entries-function)
(format-val :format))
`(progn
(defcustom ,format-var ,format-val
,(format "\
List of methods for inserting '%s' entry.
Each METHOD should be either a function or should have the
following form:
(PARAM INSERT-TITLE INSERT-VALUE)
If METHOD is a function, it is called with an entry as argument.
PARAM is a name of '%s' entry parameter.
INSERT-TITLE may be either a symbol or a list. If it is a
symbol, it should be a function or an alias from
`guix-info-title-aliases', in which case it is called with title
as argument. If it is a list, it should have a
form (FUN-OR-ALIAS [ARGS ...]), in which case FUN-OR-ALIAS is
called with title and ARGS as arguments.
INSERT-VALUE may be either a symbol or a list. If it is a
symbol, it should be a function or an alias from
`guix-info-value-aliases', in which case it is called with value
and entry as arguments. If it is a list, it should have a
form (FUN-OR-ALIAS [ARGS ...]), in which case FUN-OR-ALIAS is
called with value and ARGS as arguments.
Parameters are inserted in the same order as defined by this list.
After calling each METHOD, a new line is inserted."
entry-type-str entry-type-str)
:type 'sexp
:group ',group)
(guix-alist-put!
'((format . ,format-var))
'guix-info-data ',entry-type)
,(if show-entries-val
`(guix-buffer-define-interface info ,entry-type
:show-entries-function ,show-entries-val
,@%foreign-args)
(let ((insert-fun (intern (concat prefix "-insert-entries"))))
`(progn
(defun ,insert-fun (entries)
,(format "\
Print '%s' ENTRIES in the current 'info' buffer."
entry-type-str)
(guix-info-insert-entries entries ',entry-type))
(guix-buffer-define-interface info ,entry-type
:insert-entries-function ',insert-fun
:mode-init-function 'guix-info-mode-initialize
,@%foreign-args))))))))
(defvar guix-info-font-lock-keywords
(eval-when-compile
`((,(rx "(" (group "guix-info-define-interface")
symbol-end)
. 1))))
(font-lock-add-keywords 'emacs-lisp-mode guix-info-font-lock-keywords)
(provide 'guix-info)
;;; guix-info.el ends here