;;; helm-info.el --- Browse info index with helm -*- lexical-binding: t -*- ;; Copyright (C) 2012 ~ 2016 Thierry Volpiatto ;; This program 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. ;; This program 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 . ;;; Code: (require 'cl-lib) (require 'helm) (require 'helm-lib) (require 'helm-plugin) (require 'info) (declare-function Info-index-nodes "info" (&optional file)) (declare-function Info-goto-node "info" (&optional fork)) (declare-function Info-find-node "info.el" (filename nodename &optional no-going-back)) (defvar Info-history) (defvar Info-directory-list) ;;; Customize (defgroup helm-info nil "Info-related applications and libraries for Helm." :group 'helm) (defcustom helm-info-default-sources '(helm-source-info-elisp helm-source-info-cl helm-source-info-eieio helm-source-info-pages) "Default sources to use for looking up symbols at point in Info files with `helm-info-at-point'." :group 'helm-info :type '(repeat (choice symbol))) ;;; Build info-index sources with `helm-info-source' class. (cl-defun helm-info-init (&optional (file (helm-attr 'info-file))) ;; Allow reinit candidate buffer when using edebug. (helm-aif (and debug-on-error (helm-candidate-buffer)) (kill-buffer it)) (unless (helm-candidate-buffer) (save-window-excursion (info file) (let ((tobuf (helm-candidate-buffer 'global)) (infobuf (current-buffer)) Info-history start end) (cl-dolist (node (Info-index-nodes)) (Info-goto-node node) (goto-char (point-min)) (while (search-forward "\n* " nil t) (unless (search-forward "Menu:\n" (1+ (point-at-eol)) t) (setq start (point-at-bol) end (point-at-eol)) (with-current-buffer tobuf (insert-buffer-substring infobuf start end) (insert "\n"))))))))) (defun helm-info-goto (node-line) (Info-goto-node (car node-line)) (helm-goto-line (cdr node-line))) (defun helm-info-display-to-real (line) (and (string-match ;; This regexp is stolen from Info-apropos-matches "\\* +\\([^\n]*.+[^\n]*\\):[ \t]+\\([^\n]*\\)\\.\\(?:[ \t\n]*(line +\\([0-9]+\\))\\)?" line) (cons (format "(%s)%s" (helm-attr 'info-file) (match-string 2 line)) (string-to-number (or (match-string 3 line) "1"))))) (defclass helm-info-source (helm-source-in-buffer) ((info-file :initarg :info-file :initform nil :custom 'string) (init :initform #'helm-info-init) (display-to-real :initform #'helm-info-display-to-real) (get-line :initform #'buffer-substring) (action :initform '(("Goto node" . helm-info-goto))))) (defmacro helm-build-info-source (fname &rest args) `(helm-make-source (concat "Info Index: " ,fname) 'helm-info-source :info-file ,fname ,@args)) (defun helm-build-info-index-command (name doc source buffer) "Define a helm command NAME with documentation DOC. Arg SOURCE will be an existing helm source named `helm-source-info-' and BUFFER a string buffer name." (defalias (intern (concat "helm-info-" name)) (lambda () (interactive) (helm :sources source :buffer buffer :candidate-number-limit 1000)) doc)) (defun helm-define-info-index-sources (var-value &optional commands) "Define helm sources named helm-source-info-. Sources are generated for all entries of `helm-default-info-index-list'. If COMMANDS arg is non-nil, also build commands named `helm-info-'. Where NAME is an element of `helm-default-info-index-list'." (cl-loop for str in var-value for sym = (intern (concat "helm-source-info-" str)) do (set sym (helm-build-info-source str)) when commands do (helm-build-info-index-command str (format "Predefined helm for %s info." str) sym (format "*helm info %s*" str)))) (defun helm-info-index-set (var value) (set var value) (helm-define-info-index-sources value t)) ;;; Search Info files ;; `helm-info' is the main entry point here. It prompts the user for an Info ;; file, then a term in the file's index to jump to. (defvar helm-info-searched (make-ring 32) "Ring of previously searched Info files.") (defun helm-get-info-files () "Return list of Info files to use for `helm-info'. Elements of the list are strings of Info file names without extensions (e.g. \"emacs\" for file \"emacs.info.gz\"). Info files are found by searching directories in `Info-directory-list'." (let ((files (cl-loop for d in (or Info-directory-list Info-default-directory-list) when (file-directory-p d) append (directory-files d nil "\\.info")))) (helm-fast-remove-dups (cl-loop for f in files collect (helm-file-name-sans-extension f)) :test 'equal))) (defcustom helm-default-info-index-list (helm-get-info-files) "Info files to search in with `helm-info'." :group 'helm-info :type '(repeat (choice string)) :set 'helm-info-index-set) (defun helm-info-search-index (candidate) "Search the index of CANDIDATE's Info file using the function helm-info-." (let ((helm-info-function (intern-soft (concat "helm-info-" candidate)))) (when (fboundp helm-info-function) (funcall helm-info-function) (ring-insert helm-info-searched candidate)))) (defun helm-def-source--info-files () "Return a `helm' source for Info files." (helm-build-sync-source "Helm Info" :candidates (lambda () (copy-sequence helm-default-info-index-list)) :candidate-number-limit 999 :candidate-transformer (lambda (candidates) (sort candidates #'string-lessp)) :nomark t :action '(("Search index" . helm-info-search-index)))) ;;;###autoload (defun helm-info () "Preconfigured `helm' for searching Info files' indices." (interactive) (let ((default (unless (ring-empty-p helm-info-searched) (ring-ref helm-info-searched 0)))) (helm :sources (helm-def-source--info-files) :buffer "*helm Info*" :preselect (and default (concat "\\_<" (regexp-quote default) "\\_>"))))) ;;;; Info at point ;; `helm-info-at-point' is the main entry point here. It searches for the ;; symbol at point through the Info sources defined in ;; `helm-info-default-sources' and jumps to it. (defvar helm-info--pages-cache nil "Cache for all Info pages on the system.") (defvar helm-source-info-pages (helm-build-sync-source "Info Pages" :init #'helm-info-pages-init :candidates (lambda () helm-info--pages-cache) :action '(("Show with Info" .(lambda (node-str) (info (replace-regexp-in-string "^[^:]+: " "" node-str))))) :requires-pattern 2) "Helm source for Info pages.") (defun helm-info-pages-init () "Collect candidates for initial Info node Top." (if helm-info--pages-cache helm-info--pages-cache (let ((info-topic-regexp "\\* +\\([^:]+: ([^)]+)[^.]*\\)\\.") topics) (with-temp-buffer (Info-find-node "dir" "top") (goto-char (point-min)) (while (re-search-forward info-topic-regexp nil t) (push (match-string-no-properties 1) topics)) (kill-buffer)) (setq helm-info--pages-cache topics)))) ;;;###autoload (defun helm-info-at-point () "Preconfigured `helm' for searching info at point. With a prefix-arg insert symbol at point." (interactive) (helm :sources helm-info-default-sources :buffer "*helm info*")) (provide 'helm-info) ;; Local Variables: ;; byte-compile-warnings: (not cl-functions obsolete) ;; coding: utf-8 ;; indent-tabs-mode: nil ;; End: ;;; helm-info.el ends here