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;;; ess-help.el --- Support for viewing ESS help files -*- lexical-binding: t; -*-
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;; Copyright (C) 1989-1994, 2017 Bates, Kademan, Ritter and Smith
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;; Copyright (C) 1997, A.J. Rossini <rossini@stat.sc.edu>
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;; Copyright (C) 1998--2001 A.J. Rossini, Martin Maechler, Kurt Hornik and
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;; Richard M. Heiberger <rmh@temple.edu>.
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;; Copyright (C) 2001--2010 A.J. Rossini, Richard M. Heiberger, Martin
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;; Maechler, Kurt Hornik, Rodney Sparapani, and Stephen Eglen.
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;; Copyright (C) 2011--2012 A.J. Rossini, Richard M. Heiberger, Martin Maechler,
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;; Kurt Hornik, Rodney Sparapani, Stephen Eglen and Vitalie Spinu.
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;; Author: David Smith <dsmith@stats.adelaide.edu.au>
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;; Created: 7 Jan 1994
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;; Maintainer: ESS-core <ESS-core@r-project.org>
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;; This file is part of ESS
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;; This file is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; This file is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; A copy of the GNU General Public License is available at
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;; https://www.r-project.org/Licenses/
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;;; Commentary:
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;; Code for dealing with ESS help files. See README.<LANGUAGE> where
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;; <LANGUAGE> is one of `S', `SAS', `Stata' or `XLispStat'.
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;;; Code:
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; Requires and autoloads
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(require 'cl-lib)
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(eval-when-compile
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(require 'tramp))
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(require 'info)
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(require 'ess-mode)
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(require 'ess-inf)
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(require 'ess-utils)
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(require 'ansi-color)
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(declare-function ess-r-help-mode "ess-r-mode")
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(declare-function ess-stata-help-mode "ess-stata-lang")
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(defcustom ess-help-mode-hook nil
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"Functions to call when entering `ess-help-mode'."
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:group 'ess-hooks
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:type 'hook)
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(defvar ess--help-frame nil
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"Stores the frame used for displaying R help buffers.")
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; ess-help-mode
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;; In this section:
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;;;;
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;;;; * The function ess-display-help-on-object
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;;;; * The major mode ess-help-mode
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(cl-defgeneric ess--help-major-mode ()
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"Determine which help major mode to call, and call it.
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Uses `ess-dialect' to determine the appropriate help mode."
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(ess-help-mode))
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(defun ess--help-get-bogus-buffer-substring (buffer &optional nr-first)
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"Return non-nil if BUFFER looks like a bogus ESS help buffer.
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Return the pair (match-beg. match-end) which can be used in error
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message. NR-FIRST is the number of characters at the start of the
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buffer to examine when deciding if the buffer if bogus. If nil,
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the first 150 characters of the buffer are searched."
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(if (not nr-first) (setq nr-first 150))
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(with-current-buffer buffer
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(let ((PM (point-min))
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(case-fold-search t)
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searching res)
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(setq res
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(or ;; evaluate up to first non-nil (or end):
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(< (- (point-max) PM) 80); buffer less than 80 chars
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(not (setq searching t))
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;; todo: move to customize-alist
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(progn (goto-char PM) ;; R:
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(re-search-forward "Error in help" nr-first t))
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(progn (goto-char PM) ;; S-plus 5.1 :
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(re-search-forward "^cat: .*--" nr-first t))
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(progn (goto-char PM) ;; S version 3 ; R :
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(re-search-forward "no documentation .+" nr-first t))
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(progn (goto-char PM) ;; stata
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(re-search-forward "^help .*not found" nr-first t))))
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(ess-write-to-dribble-buffer
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(format " |--> %s [searching %s]\n" res searching))
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(when res
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(if searching
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(buffer-substring (match-beginning 0) (match-end 0))
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(buffer-string))))))
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(defun ess-help-get-local-help-buffers ()
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(ess-force-buffer-current)
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(cl-remove-if-not
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(lambda (buffer)
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(let* ((pattern (concat "*help[" ess-current-process-name "]("))
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(name (buffer-name buffer))
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(candidate (when (> (length name) (length pattern))
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(substring name 0 (length pattern))) ))
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(when (string= pattern candidate)
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buffer)))
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(buffer-list)))
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(defvar-local ess-help-type nil
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"Type of help file, help, index, vignettes etc.
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Local in `ess-help' buffers.")
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(defvar-local ess-help-object nil
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"Name of the object the help is displayed for.
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Is name of the package for package index.
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Local in `ess-help' buffers.")
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(put 'ess-help-object 'permanent-local t)
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(defun ess-display-help-on-object (object &optional command)
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"Display documentation for OBJECT.
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If prefix ARG is given, force an update of the cached help topics
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and query the ESS process for the help file instead of reusing an
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existing buffer if it exists. Uses the variable
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`inferior-ess-help-command' for the actual help command. Prompts
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for the object name based on the cursor location for all cases
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except the S-Plus GUI. With S-Plus on Windows (both GUI and in an
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inferior Emacs buffer) the GUI help window is used. If COMMAND is
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supplied, it is used instead of `inferior-ess-help-command'."
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(interactive
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(progn
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(ess-force-buffer-current)
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(when current-prefix-arg ;update cache if prefix
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(ess-process-put 'sp-for-help-changed? t))
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(list (ess-find-help-file "Help on"))))
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(let* ((hb-name (concat "*help[" ess-current-process-name "]("
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(replace-regexp-in-string "^\\?\\|`" "" object) ")*"))
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(old-hb-p (get-buffer hb-name))
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(tbuffer (get-buffer-create hb-name)))
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(when (or (not old-hb-p)
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(ess-process-get 'sp-for-help-changed?)
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(ess--help-get-bogus-buffer-substring old-hb-p))
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(ess-with-current-buffer tbuffer
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(ess--flush-help-into-current-buffer object command)
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(setq ess-help-object object)
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(ess--help-major-mode)
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(setq truncate-lines nil
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ess-help-type 'help)))
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(unless (ess--help-kill-bogus-buffer-maybe tbuffer)
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(ess-display-help tbuffer))))
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(defun ess-help-revert-buffer (_ignore-auto _noconfirm)
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"Revert the current help buffer.
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This reloads the documentation. IGNORE-AUTO and NOCONFIRM are
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ignored."
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(ess-process-put 'sp-for-help-changed? t)
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(ess-display-help-on-object ess-help-object))
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(defalias 'ess-help 'ess-display-help-on-object)
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(cl-defgeneric ess-build-help-command (object)
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"Build a string command for retrieving help on OBJECT."
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(format inferior-ess-help-command object))
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(defun ess--flush-help-into-current-buffer (object &optional command)
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(let ((inhibit-modification-hooks t)
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(inhibit-read-only t))
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(delete-region (point-min) (point-max))
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(let ((command (if (and command (string-match-p "%s" command))
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(format command object)
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command)))
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(ess-command (or command (ess-build-help-command object)) (current-buffer)))
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(ess-help-underline)
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(unless (string= ess-language "STA")
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(ess-nuke-help-bs))
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(goto-char (point-min))
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(set-buffer-modified-p 'nil)))
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(defun ess--help-kill-bogus-buffer-maybe (buffer)
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"Internal, try to kill bogus BUFFER with message. Return t if killed."
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(when ess-help-kill-bogus-buffers
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(let ((bog-mes (ess--help-get-bogus-buffer-substring buffer)))
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(when bog-mes
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;; The following is giving erroneous messages when help is displayed in the browser
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;; (when (< (length bog-mes) 10) ;;no message at all, how to treat this properly?
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;; (setq bog-mes (format "No documentation found; %s" bog-mes)))
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(ess-write-to-dribble-buffer
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(format "(ess-help: kill bogus buffer %s ..\n" (buffer-name buffer)))
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(message "%s" (replace-regexp-in-string "\n" "" bog-mes))
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;; (ding) ;; don't ding, in julia a lot of doc strings are very short
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(kill-buffer buffer)))))
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(defun ess-display-help-in-browser ()
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"Displaying HTML help where available, using \\[browse-url]."
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(interactive)
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;; Three ways to find HTML help, 1) ask sub-process 2) get URL/file from subprocess
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;; 3) call elisp function to get the file path
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;; For 2 and 3 call browse-url on the output
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(let (com-html-help ;1) command for sub-process to trigger
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;help, must contain %s for help obj
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com-get-file-path ;2) command for sub-process to return a
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; location for the help page, must
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; contain %s for help obj
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fun-get-file-path ;3) elisp function to return the
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;location, gets one argument, help topic
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not-implemented
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)
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(cond
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((string-match "^R" ess-dialect)
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(setq com-html-help "help('%s', help_type='html')\n"))
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(t (setq not-implemented t))
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)
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(if not-implemented
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(message "Sorry, not implemented for %s " ess-dialect)
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(if (or (not ess-help-object)
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(not (eq ess-help-type 'help)))
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(message "No help topic found")
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(if com-html-help
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(ess-command (format com-html-help ess-help-object))
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(require 'browse-url)
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(if com-get-file-path
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(browse-url (car (ess-get-words-from-vector
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(format com-get-file-path ess-help-object))))
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(when (functionp fun-get-file-path)
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(browse-url (funcall fun-get-file-path ess-help-object)))))))))
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(defun ess--button-action (&optional button)
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"Provide help on object at the beginning of line.
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It's intended to be used in R-index help pages. Load the package
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if necessary. It is bound to RET and C-m in R-index pages."
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(let* ((string (button-label button))
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(command (ess-build-help-command string)))
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(ess-display-help-on-object string command)))
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(cl-defgeneric ess-help-commands ()
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"Return an alist of dialect specific retriever commands.
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Currently understood commands:
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- package-for-object - command to get the package of current help object
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- packages - command to get a list of available packages (REQUIRED)
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- package-index - command to get the package index (REQUIRED)
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- index-keyword-reg - regexp used to find keywords for linking in index listing
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only (1st subexpression is used)
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- index-start-reg - regexp from where to start searching for keywords in index listing"
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(user-error "Not implemented for %s " ess-dialect))
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(cl-defmethod ess-help-commands (&context (ess-dialect "R"))
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'((package-for-object . "sub('package:', '', .ess.findFUN('%s'))\n")
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(packages . ".packages(all.available=TRUE)\n")
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(package-index . ".ess.help(package='%s', help.type='text')\n")
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(index-keyword-reg . "^\\([^ \t\n:]+\\)")
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(index-start-reg . "^Index:")))
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(defun ess-display-package-index (&optional package)
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"Prompt for package name and display its index."
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(interactive
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(list (let* ((coms (ess-help-commands))
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(all-packs (ess-get-words-from-vector (cdr (assoc 'packages coms))))
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(pack (or (when (and ess-help-object
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(cdr (assoc 'package-for-object coms))
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(eq ess-help-type 'help))
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(car (ess-get-words-from-vector
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(format (cdr (assoc 'package-for-object coms))
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ess-help-object))))
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(car (member (ess-read-object-name-default) all-packs)))))
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(ess-completing-read "Index of" all-packs nil nil nil nil pack))))
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(let ((coms (ess-help-commands)))
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(ess--display-indexed-help-page
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(format (cdr (assoc 'package-index coms)) package)
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(cdr (assoc 'index-keyword-reg coms))
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(format "*help[%s](index:%s)*" ess-dialect package)
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'index nil nil (cdr (assoc 'index-start-reg coms)) package)))
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(defun ess--display-indexed-help-page (command item-regexp title help-type
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&optional action help-echo reg-start help-object)
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"Internal function to display help pages with linked actions.
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COMMAND to produce the indexed help page,
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ITEM-REGEXP -- first subexpression is highlighted,
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TITLE of the help page,
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HELP-TYPE to be stored in `ess-help-type' local variable,
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ACTION is a function with no argument (default is `ess--button-action'),
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HELP-ECHO if given becomes the help-echo property of the button,
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REG-START gives the start location from where to search linkifying, and HELP-OBJECT becomes `ess-help-object'."
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(let ((inhibit-modification-hooks t)
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(alist ess-local-customize-alist)
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(pname ess-local-process-name)
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(buff (get-buffer-create title)))
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(ess-with-current-buffer buff
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(setq buffer-read-only nil)
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(delete-region (point-min) (point-max))
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(setq ess-local-process-name pname)
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(ess--help-major-mode)
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(ess-setq-vars-local (eval alist))
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(setq ess-help-object help-object
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ess-help-sec-regex "\\(^\\s-.*\n\\)\\|\\(^\n\\)")
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(ess-command command buff)
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(ess-help-underline)
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(set-buffer-modified-p 'nil)
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(goto-char (point-min))
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(when reg-start ;; go to the beginning of listing
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(re-search-forward reg-start nil t))
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(when item-regexp
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;;linkify the buffer
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(save-excursion
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(while (re-search-forward item-regexp nil t)
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(make-text-button (match-beginning 1) (match-end 1)
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'mouse-face 'highlight
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'action (or action #'ess--button-action)
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'help-object (buffer-substring-no-properties (match-beginning 1) (match-end 1))
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'follow-link t
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'help-echo (or help-echo "help on object")))))
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(save-excursion ;; why R help adds all these spaces?
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(goto-char (point-min))
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(when (re-search-forward "Index:\n\n" nil t)
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(let ((beg (point)))
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(forward-paragraph 1)
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(align-regexp beg (point) "\\(\\s-+\\)"))))
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(setq buffer-read-only t)
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(setq ess-help-type help-type)
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(setq truncate-lines nil))
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(unless (ess--help-kill-bogus-buffer-maybe buff)
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(ess-display-help buff))))
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(defun ess-display-help-apropos (&optional pattern)
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"Create an ess-apropos buffer with a *linked* list of apropos topics."
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(interactive "sPattern: ")
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(let (com regexp)
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(cond ((equal ess-dialect "R")
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(setq com "help.search('%s')\n"
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regexp "^\\([^ \t\n:]+::[^ \t\n:]+\\)[ \t\n]+"))
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((equal ess-dialect "julia")
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(setq com "apropos(\"%s\")\n"
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regexp "^\\(\\(\\w\\|\\s_\\)+\\)("))
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((equal ess-dialect "stata")
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(setq com "hsearch %s\n"
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regexp "^[\t ]*[0-9]+\\.[\t ]+\\(.+\\)$"))
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(t (error "Not implemented for dialect %s" ess-dialect)))
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(ess--display-indexed-help-page
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(format com pattern) regexp
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(format "*ess-apropos[%s](%s)*" ess-current-process-name pattern)
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'appropos)))
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(defun ess-display-demos ()
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"Create an ess-demos buffer with a *linked* list of available demos."
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(interactive)
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(let (com regexp)
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(cond ((equal ess-dialect "R")
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(setq com "demo()\n"
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regexp "^\\([^ \n:]+\\) +"))
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(t (error "Not implemented for dialect %s" ess-dialect)))
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(ess--display-indexed-help-page
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com regexp
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(format "*ess-demos[%s]*" ess-current-process-name)
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'demos #'ess--action-demo)))
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(defun ess--action-demo (&optional button)
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"Provide help on object at the beginning of line.
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It's intended to be used in R-index help pages. Load the package
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if necessary. It is bound to RET and C-m in R-index pages."
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(let* ((string (button-label button))
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(command
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(cond ((equal ess-dialect "R")
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(format "demo('%s')\n" string))
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(t (error "Not implemented for dialect %s" ess-dialect)))))
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(ess-eval-linewise command)
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(ess-switch-to-end-of-ESS)))
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(defun ess-display-vignettes (&optional all)
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"Display vignettes if available for the current dialect.
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With (prefix) ALL non-nil, use `vignette(*, all=TRUE)`, i.e., from all installed
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packages, which can be *very* slow."
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(interactive "P")
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(ess--display-vignettes-override all))
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(cl-defgeneric ess--display-vignettes-override (_all)
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"Display vignettes for the current dialect.
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See `ess-display-vignettes' for ALL."
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(user-error "Sorry, not implemented for %s" ess-dialect))
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(defun ess--action-open-in-emacs (pos)
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(display-buffer (find-file-noselect (get-text-property pos 'help-echo))))
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(defun ess--action-R-open-vignette (pos)
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(ess-eval-linewise (format "vignette('%s', package='%s')\n"
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(get-text-property pos 'vignette)
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(get-text-property pos 'package))))
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(defalias 'ess-help-quit 'quit-window)
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(make-obsolete 'ess-help-quit 'quit-window "16.04")
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(defun ess-display-help (buff)
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"Display buffer BUFF.
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If `ess-help-pop-to-buffer' is non-nil, call `pop-to-buffer',
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otherwise call `display-buffer' to display the buffer.
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You may control how help buffers are displayed by EITHER setting
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an entry in `display-buffer-alist' (see examples in info
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node `(ess) Controlling buffer display') OR setting the
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ESS-specific variables `ess-help-own-frame',
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`ess-help-reuse-window', `ess-help-frame-alist', and
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`ess-display-buffer-reuse-frames'."
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(let* ((action (cond (ess-help-own-frame
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'(display-buffer-reuse-window
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display-buffer-use-some-frame
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display-buffer-pop-up-frame))
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(ess-help-reuse-window
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'(display-buffer-reuse-window
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ess-display-buffer-reuse-mode-window
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display-buffer-pop-up-window
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display-buffer-use-some-window))
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(t '(display-buffer-pop-up-window
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display-buffer-use-some-window))))
|
|
(alist `((mode . (ess-help-mode ess-r-help-mode ess-stata-help-mode ess-julia-help-mode))
|
|
(reusable-frames . ,ess-display-buffer-reuse-frames)
|
|
;; `display-buffer-use-some-frame' uses this to
|
|
;; determine whether to use the frame or not.
|
|
(frame-predicate . (lambda (f)
|
|
(when (equal ess-help-own-frame 'one)
|
|
;; Note we're always returning
|
|
;; nil for `ess-help-own-frame' t.
|
|
(frame-parameter f 'ess-help-frame))))
|
|
;; If `display-buffer' makes a new frame, these are
|
|
;; given as frame parameters.
|
|
(pop-up-frame-parameters . ,(append ess-help-frame-alist
|
|
`((auto-hide-function . delete-frame)
|
|
(ess-help-frame . ,(equal ess-help-own-frame 'one)))))))
|
|
(display-alist `(,action . ,alist)))
|
|
(if ess-help-pop-to-buffer
|
|
(pop-to-buffer buff display-alist)
|
|
(display-buffer buff display-alist))))
|
|
|
|
(defun ess-help-web-search (cmd)
|
|
"Search the web for documentation on CMD."
|
|
(interactive "sSearch for: ")
|
|
(ess--help-web-search-override cmd))
|
|
|
|
(cl-defgeneric ess--help-web-search-override (_cmd)
|
|
"Dialect-specific override for `ess-help-web-search', which see for CMD."
|
|
(error "Not implemented for %s" ess-dialect))
|
|
|
|
(defun ess-manual-lookup ()
|
|
"Search manual for documentation."
|
|
(interactive)
|
|
(ess--manual-lookup-override))
|
|
|
|
(cl-defgeneric ess--manual-lookup-override ()
|
|
"Dialect-specific override for `ess-manual-lookup'."
|
|
(error "Not implemented for %s" ess-dialect))
|
|
|
|
(defvar ess-doc-map
|
|
(let (ess-doc-map)
|
|
(define-prefix-command 'ess-doc-map)
|
|
(define-key ess-doc-map "\C-e" #'ess-describe-object-at-point)
|
|
(define-key ess-doc-map "e" #'ess-describe-object-at-point)
|
|
(define-key ess-doc-map "\C-d" #'ess-display-help-on-object)
|
|
(define-key ess-doc-map "d" #'ess-display-help-on-object)
|
|
(define-key ess-doc-map "\C-i" #'ess-display-package-index)
|
|
(define-key ess-doc-map "i" #'ess-display-package-index)
|
|
(define-key ess-doc-map "\C-a" #'ess-display-help-apropos)
|
|
(define-key ess-doc-map "a" #'ess-display-help-apropos)
|
|
(define-key ess-doc-map "\C-v" #'ess-display-vignettes)
|
|
(define-key ess-doc-map "v" #'ess-display-vignettes)
|
|
(define-key ess-doc-map "\C-o" #'ess-display-demos)
|
|
(define-key ess-doc-map "o" #'ess-display-demos)
|
|
(define-key ess-doc-map "\C-w" #'ess-help-web-search)
|
|
(define-key ess-doc-map "w" #'ess-help-web-search)
|
|
(define-key ess-doc-map "\C-m" #'ess-manual-lookup)
|
|
(define-key ess-doc-map "m" #'ess-manual-lookup)
|
|
ess-doc-map)
|
|
"ESS documentation map.")
|
|
|
|
|
|
(defvar ess-help-mode-map
|
|
(let ((map (make-keymap)))
|
|
(define-key map "\C-m" #'next-line)
|
|
(define-key map "h" #'ess-display-help-on-object)
|
|
(define-key map "w" #'ess-display-help-in-browser)
|
|
(define-key map "i" #'ess-display-package-index)
|
|
(define-key map "a" #'ess-display-help-apropos)
|
|
(define-key map "v" #'ess-display-vignettes)
|
|
(define-key map "l" #'ess-eval-line-visibly-and-step)
|
|
(define-key map "r" #'ess-eval-region-and-go)
|
|
(define-key map "f" #'ess-eval-function-or-paragraph-and-step)
|
|
(define-key map "n" #'ess-skip-to-next-section)
|
|
(define-key map "p" #'ess-skip-to-previous-section)
|
|
(define-key map "/" #'isearch-forward)
|
|
(define-key map "x" #'ess-kill-buffer-and-go)
|
|
(define-key map "k" #'kill-this-buffer)
|
|
(define-key map "\C-c\C-s" #'ess-switch-process)
|
|
(define-key map "\C-c\C-r" #'ess-eval-region)
|
|
(define-key map "\C-c\M-r" #'ess-eval-region-and-go)
|
|
(define-key map "\C-c\C-f" #'ess-eval-function)
|
|
(define-key map "\M-\C-x" #'ess-eval-function)
|
|
(define-key map "\C-c\M-f" #'ess-eval-function-and-go)
|
|
(define-key map "\C-c\C-j" #'ess-eval-line)
|
|
(define-key map "\C-c\C-n" #'ess-eval-line-visibly-and-step)
|
|
(define-key map "\C-c\C-c" #'ess-eval-region-or-function-or-paragraph-and-step)
|
|
(define-key map [(control return)] #'ess-eval-region-or-line-visibly-and-step)
|
|
(define-key map "\C-c\M-j" #'ess-eval-line-and-go)
|
|
(define-key map "\M-\C-a" #'ess-goto-beginning-of-function-or-para)
|
|
(define-key map "\M-\C-e" #'ess-goto-end-of-function-or-para)
|
|
(define-key map "\C-c\C-y" #'ess-switch-to-ESS)
|
|
(define-key map "\C-c\C-z" #'ess-switch-to-end-of-ESS)
|
|
(define-key map "\C-c\C-l" #'ess-load-file)
|
|
(define-key map "\C-c\M-l" #'ess-load-file); alias, as in #'iESS#' where C-c C-l is comint-list-*
|
|
(define-key map "\C-c\C-v" #'ess-display-help-on-object)
|
|
(define-key map "\C-c\C-k" #'ess-request-a-process)
|
|
(define-key map "\C-c\C-d" 'ess-doc-map)
|
|
(define-key map "\C-c\C-e" 'ess-extra-map)
|
|
(define-key map "\C-c\C-t" 'ess-dev-map)
|
|
map)
|
|
"Keymap for ESS help mode.")
|
|
|
|
;; One reason for the following menu is to <TEACH> the user about key strokes
|
|
(defvar ess-help-mode-menu
|
|
'("ESS-help"
|
|
["Search forward" isearch-forward t]
|
|
["Next section" ess-skip-to-next-section t]
|
|
["Previous section" ess-skip-to-previous-section t]
|
|
["Help on section skipping" ess-describe-sec-map t]
|
|
["Beginning of buffer" beginning-of-buffer t]
|
|
["End of buffer" end-of-buffer t]
|
|
"-"
|
|
["Help on ..." ess-display-help-on-object t]
|
|
["Apropos of ..." ess-display-help-apropos t]
|
|
["Index of ..." ess-display-package-index t]
|
|
["Vignettes" ess-display-vignettes t]
|
|
["Open in browser" ess-display-help-in-browser t]
|
|
"-"
|
|
["Eval line" ess-eval-line-and-step t]
|
|
["Eval paragraph & step" ess-eval-paragraph-and-step t]
|
|
["Eval region & go" ess-eval-region-and-go t]
|
|
["Switch to ESS process" ess-switch-to-ESS t]
|
|
["Switch to end of ESS proc." ess-switch-to-end-of-ESS t]
|
|
["Switch _the_ process" ess-switch-process t]
|
|
"-"
|
|
["Kill buffer" kill-this-buffer t]
|
|
["Kill buffer & go" ess-kill-buffer-and-go t]
|
|
"-"
|
|
["Handy commands" ess-handy-commands t])
|
|
"Menu used in ess-help mode.")
|
|
|
|
(easy-menu-define ess-help-mode-menu-map ess-help-mode-map
|
|
"Menu keymap for ess-help mode." ess-help-mode-menu)
|
|
|
|
(define-derived-mode ess-help-mode special-mode "ESS Help"
|
|
"Mode for viewing ESS help files."
|
|
:group 'ess-help
|
|
;; FIXME
|
|
;; (if ess-mode-syntax-table ;;set in advance by ess-setq-local
|
|
;; (set-syntax-table ess-mode-syntax-table))
|
|
(setq-local revert-buffer-function #'ess-help-revert-buffer)
|
|
(setq show-trailing-whitespace nil))
|
|
|
|
|
|
;;*;; User commands defined in ESS help mode
|
|
|
|
(defun ess-skip-to-help-section ()
|
|
"Jump to a section heading of a help buffer.
|
|
The section selected is determined by the command letter used to
|
|
invoke the command, as indicated by `ess-help-sec-keys-alist'.
|
|
Use \\[ess-describe-sec-map] to see which keystrokes find which
|
|
sections."
|
|
(interactive)
|
|
(let ((old-point (point))
|
|
(case-fold-search nil)
|
|
(the-sec (cdr (assoc last-command-event ess-help-sec-keys-alist))))
|
|
(cl-assert the-sec nil (format "Invalid section key: %c" last-command-event))
|
|
(goto-char (point-min))
|
|
(if (re-search-forward (concat "^" the-sec) nil t)
|
|
(progn (recenter)
|
|
(beginning-of-line))
|
|
(message "No %s section in this help. Sorry." the-sec)
|
|
(goto-char old-point))))
|
|
|
|
(defun ess-skip-to-next-section ()
|
|
"Jump to next section in ESS help buffer."
|
|
(interactive)
|
|
(let ((case-fold-search nil))
|
|
(when (looking-at-p ess-help-sec-regex)
|
|
(forward-line))
|
|
(if (re-search-forward ess-help-sec-regex nil 'no-error)
|
|
(beginning-of-line)
|
|
(message "No more sections."))))
|
|
|
|
(defun ess-skip-to-previous-section ()
|
|
"Jump to previous section in ESS help buffer."
|
|
(interactive)
|
|
(let ((case-fold-search nil))
|
|
(if (re-search-backward ess-help-sec-regex nil 'no-error)
|
|
(beginning-of-line)
|
|
(message "No previous section."))))
|
|
|
|
(defun ess-kill-buffer-and-go nil
|
|
"Kill the current buffer and switch back to the ESS process."
|
|
(interactive)
|
|
(kill-buffer (current-buffer))
|
|
(when (and ess-current-process-name (get-process ess-current-process-name))
|
|
(ess-switch-to-ESS nil)))
|
|
|
|
(defun ess-describe-sec-map nil
|
|
"Display help for the `s' key."
|
|
(interactive)
|
|
(let ((keys-alist ess-help-sec-keys-alist))
|
|
(describe-function 'ess-skip-to-help-section)
|
|
|
|
(with-current-buffer "*Help*"
|
|
(setq buffer-read-only nil)
|
|
(goto-char (point-max))
|
|
(insert "\n\nCurrently defined keys are:
|
|
|
|
Keystroke Section
|
|
--------- -------\n")
|
|
(dolist (cs keys-alist)
|
|
(insert " "
|
|
(car cs)
|
|
" "
|
|
(cdr cs) "\n")))))
|
|
|
|
(defun ess-helpobjs-at-point--read-obj ()
|
|
(let* ((obj (ess-read-object-name-default)))
|
|
;; Exclude numbers
|
|
(unless (and obj (not (string-match "[[:alpha:]]" obj)))
|
|
obj)))
|
|
|
|
(defun ess-unqualify-symbol (object)
|
|
(if (string-match "^[[:alnum:].]+::?" object)
|
|
(substring object (match-end 0))
|
|
object))
|
|
|
|
(defun ess-helpobjs-at-point (slist)
|
|
"Return a list (def obj fun).
|
|
Obj is a name at point, fun is the name of the function call
|
|
point is in, and def is either obj or fun (in that order) which
|
|
has a a help file, i.e. it is a member of SLIST (string-list).
|
|
nil otherwise."
|
|
(let* ((obj (ess-helpobjs-at-point--read-obj))
|
|
(unqualified-obj (and obj (ess-unqualify-symbol obj)))
|
|
;; FIXME: probably should use syntactic logic here
|
|
(fun (ignore-errors
|
|
(save-excursion
|
|
(save-restriction
|
|
(narrow-to-region (max (point-min) (- (point) 1000))
|
|
(point-max))
|
|
(backward-up-list 1)
|
|
(backward-char 1)
|
|
(ess-read-object-name-default))))))
|
|
(list (or (car (member obj slist))
|
|
(when (member unqualified-obj slist)
|
|
obj)
|
|
(car (member fun slist)))
|
|
obj fun)))
|
|
|
|
(cl-defgeneric ess-help-get-topics (proc)
|
|
"Return a list of help topics from PROC."
|
|
(user-error "Not supported for %s (process: %s)" ess-dialect proc))
|
|
|
|
(defun ess-find-help-file (p-string)
|
|
"Find help, prompting for P-STRING."
|
|
(ess-make-buffer-current)
|
|
(let* ((help-files-list (ess-help-get-topics ess-current-process-name))
|
|
(hlpobjs (delq nil (ess-helpobjs-at-point help-files-list))))
|
|
(ess-completing-read p-string (append hlpobjs help-files-list)
|
|
nil nil nil nil (car hlpobjs))))
|
|
|
|
|
|
;;*;; Utility functions
|
|
|
|
(defun ess-get-help-files-list ()
|
|
"Return a list of files which have help available."
|
|
(apply 'nconc
|
|
(mapcar (lambda (str)
|
|
(let ((dirname (concat str "/.Help")))
|
|
(and (file-directory-p dirname)
|
|
(directory-files dirname))))
|
|
(ess-search-list))))
|
|
|
|
(defun ess-get-help-aliases-list ()
|
|
"Return a list of aliases which have help available."
|
|
(message "Retrieving RDS aliases...")
|
|
;; ess-command locks display, make sure the above message is visible
|
|
(redisplay t)
|
|
(ess-write-to-dribble-buffer "Processing RDS files ...\n")
|
|
(prog1 (ess-get-words-from-vector ".ess.getHelpAliases()\n")
|
|
(message "Retrieving RDS aliases...done")))
|
|
|
|
(defun ess-nuke-help-bs ()
|
|
"Remove ASCII underlining and overstriking performed by ^H codes."
|
|
;; This function is a modification of nuke-nroff-bs in man.el from the
|
|
;; standard Emacs 18 lisp library.
|
|
;; Nuke underlining and overstriking (only by the same letter)
|
|
(goto-char (point-min))
|
|
(while (search-forward "\b" nil t)
|
|
(let* ((preceding (char-after (- (point) 2)))
|
|
(following (following-char)))
|
|
(cond ((= preceding following)
|
|
;; x\bx
|
|
(delete-char -2))
|
|
((= preceding ?\_)
|
|
;; _\b
|
|
(delete-char -2))
|
|
((= following ?\_)
|
|
;; \b_
|
|
(delete-region (1- (point)) (1+ (point)))))))
|
|
(goto-char (point-min))
|
|
(let ((case-fold-search nil)); 'URL' != 'url' ('libcurl: ' on ?capabilities)
|
|
(while (re-search-forward "\\bURL: " nil t); test with ?rtags
|
|
;; quick fix for C-x f confusion (getting into tramp)
|
|
(delete-region (match-beginning 0) (match-end 0))))
|
|
;; Crunch blank lines
|
|
(goto-char (point-min))
|
|
(while (re-search-forward "\n\n\n\n*" nil t)
|
|
(replace-match "\n\n"))
|
|
;; Nuke blanks lines at start.
|
|
(goto-char (point-min))
|
|
(skip-chars-forward "\n")
|
|
(delete-region (point-min) (point)))
|
|
|
|
(defun ess-help-underline ()
|
|
"Replace _^H codes with underline face."
|
|
(save-excursion
|
|
(goto-char (point-min))
|
|
(while (search-forward "_" nil t)
|
|
(backward-delete-char 2)
|
|
(put-text-property (point) (1+ (point)) 'face 'underline))))
|
|
|
|
;;*;; Link to Info
|
|
(defun ess-goto-info (node)
|
|
"Display node NODE from `ess-mode' info."
|
|
(require 'info)
|
|
(split-window)
|
|
(Info-goto-node (concat "(ess)" node)))
|
|
|
|
|
|
;; describe object at point
|
|
|
|
(defvar-local ess-describe-object-at-point-commands nil
|
|
"Commands cycled by `ess-describe-object-at-point'.
|
|
Dialect specific.")
|
|
|
|
(defvar ess--descr-o-a-p-commands nil)
|
|
|
|
(defun ess-describe-object-at-point ()
|
|
"Get info for object at point, & display it in an electric buffer or tooltip.
|
|
If region is active use it instead of the object at point.
|
|
|
|
This is an electric command (`ess--execute-electric-command'),
|
|
which means that you can use the last key to cycle through the
|
|
action set (in this case `C-e'). After invocation of this command
|
|
all standard Emacs commands, except those containing 'window' in
|
|
their names, remove the electric *ess-describe* buffer. Use
|
|
`other-window' to switch to *ess-describe* window.
|
|
|
|
Customize `ess-describe-at-point-method' if you wan to display
|
|
the description in a tooltip. See also
|
|
`ess-r-describe-object-at-point-commands' (and similar option for
|
|
other dialects)."
|
|
(interactive)
|
|
(if (not ess-describe-object-at-point-commands)
|
|
(message "Not implemented for dialect %s" ess-dialect)
|
|
(ess-force-buffer-current)
|
|
(let ((map (make-sparse-keymap))
|
|
(objname (or (and (use-region-p)
|
|
(buffer-substring-no-properties (point) (mark)))
|
|
(ess-symbol-at-point)))
|
|
ess--descr-o-a-p-commands) ;; used in ess--describe-object-at-point
|
|
(unless objname (error "No object at point "))
|
|
(define-key map (vector last-command-event) 'ess--describe-object-at-point)
|
|
;; todo: put digits into the map
|
|
(let* ((inhibit-quit t) ;; C-g removes the buffer
|
|
(buf (ess--execute-electric-command
|
|
map (format "Press %s to cycle"
|
|
(single-key-description last-command-event))
|
|
nil nil objname))
|
|
;; read full command
|
|
(keys (read-key-sequence-vector ""))
|
|
(command (and keys (key-binding keys))))
|
|
(when (and (commandp command)
|
|
(bufferp buf)
|
|
(or (not (symbolp command)) ;; kill on lambdas
|
|
(not (string-match "window" (symbol-name command)))))
|
|
(kill-buffer buf)) ;; bury does not work here :( (Emacs bug?)
|
|
(setq unread-command-events
|
|
(append keys unread-command-events))))))
|
|
|
|
(defun ess--describe-object-at-point (_ev objname)
|
|
(setq ess--descr-o-a-p-commands (or ess--descr-o-a-p-commands
|
|
(symbol-value ess-describe-object-at-point-commands)))
|
|
(let* ((com (format (car (pop ess--descr-o-a-p-commands)) objname))
|
|
(buf (get-buffer-create "*ess-describe*"))
|
|
pos)
|
|
(unless (eq ess-describe-at-point-method 'tooltip)
|
|
;; can take some time for the command to execute
|
|
(display-buffer buf))
|
|
(sit-for .01)
|
|
(ess-command (concat com "\n") buf) ;; erases buf
|
|
(with-current-buffer buf
|
|
(goto-char (point-min))
|
|
(insert (propertize (format "%s:\n\n" com) 'face 'font-lock-string-face))
|
|
(forward-line -1)
|
|
(setq pos (point))
|
|
;; set the keys that we are used to in help mode
|
|
(special-mode)
|
|
(let ((inhibit-read-only t))
|
|
(ansi-color-apply-on-region (point-min) (point-max))))
|
|
(if (eq ess-describe-at-point-method 'tooltip)
|
|
(ess-tooltip-show-at-point
|
|
(with-current-buffer buf (buffer-string)) 0 30)
|
|
(display-buffer buf)
|
|
(set-window-point (get-buffer-window buf) pos) ;; don't move window point
|
|
buf)))
|
|
|
|
(with-no-warnings
|
|
;; We're just backporting here, don't care about compiler warnings
|
|
(defalias 'ess-display-buffer-reuse-mode-window
|
|
;; TODO: Remove once we drop support for Emacs 25
|
|
(if (fboundp 'display-buffer-reuse-mode-window)
|
|
'display-buffer-reuse-mode-window
|
|
(lambda (buffer alist)
|
|
(let* ((alist-entry (assq 'reusable-frames alist))
|
|
(alist-mode-entry (assq 'mode alist))
|
|
(frames (cond (alist-entry (cdr alist-entry))
|
|
((if (eq pop-up-frames 'graphic-only)
|
|
(display-graphic-p)
|
|
pop-up-frames)
|
|
0)
|
|
(display-buffer-reuse-frames 0)
|
|
(t (last-nonminibuffer-frame))))
|
|
(inhibit-same-window-p (cdr (assq 'inhibit-same-window alist)))
|
|
(windows (window-list-1 nil 'nomini frames))
|
|
(buffer-mode (with-current-buffer buffer major-mode))
|
|
(allowed-modes (if alist-mode-entry
|
|
(cdr alist-mode-entry)
|
|
buffer-mode))
|
|
(curwin (selected-window))
|
|
(curframe (selected-frame)))
|
|
(unless (listp allowed-modes)
|
|
(setq allowed-modes (list allowed-modes)))
|
|
(let (same-mode-same-frame
|
|
same-mode-other-frame
|
|
derived-mode-same-frame
|
|
derived-mode-other-frame)
|
|
(dolist (window windows)
|
|
(let ((mode?
|
|
(with-current-buffer (window-buffer window)
|
|
(cond ((memq major-mode allowed-modes)
|
|
'same)
|
|
((derived-mode-p allowed-modes)
|
|
'derived)))))
|
|
(when (and mode?
|
|
(not (and inhibit-same-window-p
|
|
(eq window curwin))))
|
|
(push window (if (eq curframe (window-frame window))
|
|
(if (eq mode? 'same)
|
|
same-mode-same-frame
|
|
derived-mode-same-frame)
|
|
(if (eq mode? 'same)
|
|
same-mode-other-frame
|
|
derived-mode-other-frame))))))
|
|
(let ((window (car (nconc same-mode-same-frame
|
|
same-mode-other-frame
|
|
derived-mode-same-frame
|
|
derived-mode-other-frame))))
|
|
(when (window-live-p window)
|
|
(prog1 (window--display-buffer buffer window 'reuse alist)
|
|
(unless (cdr (assq 'inhibit-switch-frame alist))
|
|
(window--maybe-raise-frame (window-frame window))))))))))))
|
|
|
|
(provide 'ess-help)
|
|
;;; ess-help.el ends here
|