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-;;; 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