;;; helm-info.el --- Browse info index with helm -*- lexical-binding: t -*-
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;; Copyright (C) 2012 ~ 2018 Thierry Volpiatto <thierry.volpiatto@gmail.com>
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;; This program 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 3 of the License, or
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;; (at your option) any later version.
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;; This program 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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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Code:
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(require 'cl-lib)
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(require 'helm)
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(require 'helm-lib)
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(require 'helm-utils)
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(require 'info)
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(declare-function Info-index-nodes "info" (&optional file))
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(declare-function Info-goto-node "info" (&optional fork))
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(declare-function Info-find-node "info.el" (filename nodename &optional no-going-back))
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(defvar Info-history)
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(defvar Info-directory-list)
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;;; Customize
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(defgroup helm-info nil
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"Info-related applications and libraries for Helm."
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:group 'helm)
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(defcustom helm-info-default-sources
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'(helm-source-info-elisp
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helm-source-info-cl
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helm-source-info-eieio
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helm-source-info-pages)
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"Default sources to use for looking up symbols at point in Info
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files with `helm-info-at-point'."
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:group 'helm-info
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:type '(repeat (choice symbol)))
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;;; Build info-index sources with `helm-info-source' class.
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(cl-defun helm-info-init (&optional (file (helm-attr 'info-file)))
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;; Allow reinit candidate buffer when using edebug.
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(helm-aif (and debug-on-error
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(helm-candidate-buffer))
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(kill-buffer it))
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(unless (helm-candidate-buffer)
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(save-selected-window
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(info file " *helm info temp buffer*")
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(let ((tobuf (helm-candidate-buffer 'global))
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Info-history
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start end line)
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(cl-dolist (node (Info-index-nodes))
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(Info-goto-node node)
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(goto-char (point-min))
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(while (search-forward "\n* " nil t)
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(unless (search-forward "Menu:\n" (1+ (point-at-eol)) t)
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(setq start (point-at-bol)
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;; Fix issue #1503 by getting the invisible
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;; info displayed on next line in long strings.
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;; e.g "* Foo.\n (line 12)" instead of
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;; "* Foo.(line 12)"
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end (or (save-excursion
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(goto-char (point-at-bol))
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(re-search-forward "(line +[0-9]+)" nil t))
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(point-at-eol))
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;; Long string have a new line inserted before the
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;; invisible spec, remove it.
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line (replace-regexp-in-string
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"\n" "" (buffer-substring start end)))
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(with-current-buffer tobuf
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(insert line)
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(insert "\n")))))
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(bury-buffer)))))
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(defun helm-info-goto (node-line)
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(Info-goto-node (car node-line))
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(helm-goto-line (cdr node-line)))
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(defun helm-info-display-to-real (line)
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(and (string-match
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;; This regexp is stolen from Info-apropos-matches
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"\\* +\\([^\n]*.+[^\n]*\\):[ \t]+\\([^\n]*\\)\\.\\(?:[ \t\n]*(line +\\([0-9]+\\))\\)?" line)
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(cons (format "(%s)%s" (helm-attr 'info-file) (match-string 2 line))
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(string-to-number (or (match-string 3 line) "1")))))
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(defclass helm-info-source (helm-source-in-buffer)
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((info-file :initarg :info-file
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:initform nil
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:custom 'string)
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(init :initform #'helm-info-init)
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(display-to-real :initform #'helm-info-display-to-real)
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(get-line :initform #'buffer-substring)
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(action :initform '(("Goto node" . helm-info-goto)))))
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(defmacro helm-build-info-source (fname &rest args)
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`(helm-make-source (concat "Info Index: " ,fname) 'helm-info-source
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:info-file ,fname ,@args))
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(defun helm-build-info-index-command (name doc source buffer)
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"Define a helm command NAME with documentation DOC.
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Arg SOURCE will be an existing helm source named
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`helm-source-info-<NAME>' and BUFFER a string buffer name."
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(defalias (intern (concat "helm-info-" name))
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(lambda ()
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(interactive)
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(helm :sources source
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:buffer buffer
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:candidate-number-limit 1000))
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doc))
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(defun helm-define-info-index-sources (var-value &optional commands)
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"Define helm sources named helm-source-info-<NAME>.
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Sources are generated for all entries of `helm-default-info-index-list'.
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If COMMANDS arg is non-nil, also build commands named `helm-info-<NAME>'.
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Where NAME is an element of `helm-default-info-index-list'."
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(cl-loop for str in var-value
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for sym = (intern (concat "helm-source-info-" str))
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do (set sym (helm-build-info-source str))
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when commands
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do (helm-build-info-index-command
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str (format "Predefined helm for %s info." str)
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sym (format "*helm info %s*" str))))
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(defun helm-info-index-set (var value)
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(set var value)
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(helm-define-info-index-sources value t))
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;;; Search Info files
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;; `helm-info' is the main entry point here. It prompts the user for an Info
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;; file, then a term in the file's index to jump to.
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(defvar helm-info-searched (make-ring 32)
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"Ring of previously searched Info files.")
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(defun helm-get-info-files ()
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"Return list of Info files to use for `helm-info'.
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Elements of the list are strings of Info file names without
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extensions (e.g. \"emacs\" for file \"emacs.info.gz\"). Info
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files are found by searching directories in
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`Info-directory-list'."
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(let ((files (cl-loop for d in (or Info-directory-list
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Info-default-directory-list)
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when (file-directory-p d)
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append (directory-files d nil "\\.info"))))
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(helm-fast-remove-dups
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(cl-loop for f in files collect
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(helm-file-name-sans-extension f))
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:test 'equal)))
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(defcustom helm-default-info-index-list
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(helm-get-info-files)
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"Info files to search in with `helm-info'."
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:group 'helm-info
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:type '(repeat (choice string))
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:set 'helm-info-index-set)
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(defun helm-info-search-index (candidate)
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"Search the index of CANDIDATE's Info file using the function
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helm-info-<CANDIDATE>."
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(let ((helm-info-function
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(intern-soft (concat "helm-info-" candidate))))
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(when (fboundp helm-info-function)
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(funcall helm-info-function)
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(ring-insert helm-info-searched candidate))))
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(defun helm-def-source--info-files ()
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"Return a `helm' source for Info files."
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(helm-build-sync-source "Helm Info"
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:candidates
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(lambda () (copy-sequence helm-default-info-index-list))
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:candidate-number-limit 999
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:candidate-transformer
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(lambda (candidates)
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(sort candidates #'string-lessp))
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:nomark t
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:action '(("Search index" . helm-info-search-index))))
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;;;###autoload
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(defun helm-info (&optional refresh)
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"Preconfigured `helm' for searching Info files' indices.
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With a prefix argument \\[universal-argument], set REFRESH to non-nil.
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Optional parameter REFRESH, when non-nil, reevaluates
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`helm-default-info-index-list'. If the variable has been
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customized, set it to its saved value. If not, set it to its
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standard value. See `custom-reevaluate-setting' for more.
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REFRESH is useful when new Info files are installed. If
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`helm-default-info-index-list' has not been customized, the new
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Info files are made available."
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(interactive "P")
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(let ((default (unless (ring-empty-p helm-info-searched)
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(ring-ref helm-info-searched 0))))
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(when refresh
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(custom-reevaluate-setting 'helm-default-info-index-list))
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(helm :sources (helm-def-source--info-files)
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:buffer "*helm Info*"
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:preselect (and default
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(concat "\\_<" (regexp-quote default) "\\_>")))))
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;;;; Info at point
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;; `helm-info-at-point' is the main entry point here. It searches for the
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;; symbol at point through the Info sources defined in
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;; `helm-info-default-sources' and jumps to it.
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(defvar helm-info--pages-cache nil
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"Cache for all Info pages on the system.")
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(defvar helm-source-info-pages
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(helm-build-sync-source "Info Pages"
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:init #'helm-info-pages-init
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:candidates (lambda () helm-info--pages-cache)
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:action '(("Show with Info" .
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(lambda (node-str)
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(info (replace-regexp-in-string
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"^[^:]+: " "" node-str)))))
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:requires-pattern 2)
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"Helm source for Info pages.")
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(defun helm-info-pages-init ()
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"Collect candidates for initial Info node Top."
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(or helm-info--pages-cache
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(let ((info-topic-regexp "\\* +\\([^:]+: ([^)]+)[^.]*\\)\\."))
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(save-selected-window
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(info "dir" " *helm info temp buffer*")
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(Info-find-node "dir" "top")
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(goto-char (point-min))
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(while (re-search-forward info-topic-regexp nil t)
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(push (match-string-no-properties 1)
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helm-info--pages-cache))
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(kill-buffer)))))
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;;;###autoload
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(defun helm-info-at-point ()
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"Preconfigured `helm' for searching info at point."
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(interactive)
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(cl-loop for src in helm-info-default-sources
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for name = (if (symbolp src)
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(assoc 'name (symbol-value src))
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(assoc 'name src))
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unless name
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do (warn "Couldn't build source `%S' without its info file" src))
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(helm :sources helm-info-default-sources
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:buffer "*helm info*"))
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(provide 'helm-info)
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;; Local Variables:
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;; byte-compile-warnings: (not obsolete)
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;; coding: utf-8
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;; indent-tabs-mode: nil
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;; End:
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;;; helm-info.el ends here
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