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;;; helm-info.el --- Browse info index with helm
;; Copyright (C) 2012 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
;; 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:
(eval-when-compile (require 'cl))
(require 'helm)
(require 'helm-plugin)
(require 'helm-net)
(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))
(defgroup helm-info nil
"Info related Applications and libraries for Helm."
:group 'helm)
;;; Build info-index sources with info-index plug-in.
(defun helm-c-build-info-index-command (name doc source buffer)
"Define an helm command NAME with documentation DOC.
Arg SOURCE will be an existing helm source named
`helm-c-source-info-<NAME>' and BUFFER a string buffer name."
(eval (list 'defun name nil doc
(list 'interactive)
(list 'helm
:sources source
:buffer buffer
:candidate-number-limit 1000))))
(defun helm-c-define-info-index-sources (var-value &optional commands)
"Define helm sources named helm-c-source-info-<NAME>.
Sources are generated for all entries of `helm-c-default-info-index-list'.
If COMMANDS arg is non--nil build also commands named `helm-info<NAME>'.
Where NAME is one of `helm-c-default-info-index-list'."
(loop with symbols = (loop for str in var-value
(intern (concat "helm-c-source-info-" str)))
for sym in symbols
for str in var-value
do (set sym (list (cons 'name (format "Info index: %s" str))
(cons 'info-index str)))
when commands
do (let ((com (intern (concat "helm-info-" str))))
com (format "Predefined helm for %s info." str)
sym (format "*helm info %s*" str)))))
(defun helm-info-index-set (var value)
(set var value)
(helm-c-define-info-index-sources value t))
(defcustom helm-c-default-info-index-list
'("elisp" "cl" "org" "gnus" "tramp" "ratpoison"
"zsh" "bash" "coreutils" "fileutils"
"find" "sh-utils" "textutils" "libc"
"make" "automake" "autoconf" "emacs-lisp-intro"
"emacs" "elib" "eieio" "gauche-refe" "guile"
"guile-tut" "goops" "screen" "latex" "gawk"
"sed" "m4" "wget" "binutils" "as" "bfd" "gprof"
"ld" "diff" "flex" "grep" "gzip" "libtool"
"texinfo" "info" "gdb" "stabs" "cvsbook" "cvs"
"bison" "id-utils" "global")
"Info Manual entries to use for building helm info index commands."
:group 'helm-info
:type '(repeat (choice string))
:set 'helm-info-index-set)
;;; Info pages
(defvar helm-c-info-pages nil
"All info pages on system.
Will be calculated the first time you invoke helm with this
(defun helm-c-info-pages-init ()
"Collect candidates for initial Info node Top."
(if helm-c-info-pages
(let ((info-topic-regexp "\\* +\\([^:]+: ([^)]+)[^.]*\\)\\.")
(require 'info)
(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))
(setq helm-c-info-pages topics))))
(defvar helm-c-source-info-pages
`((name . "Info Pages")
(init . helm-c-info-pages-init)
(candidates . helm-c-info-pages)
(action . (("Show with Info" .(lambda (node-str)
(info (replace-regexp-in-string
"^[^:]+: " "" node-str))))))
(requires-pattern . 2)))
(defun helm-info-at-point (arg)
"Preconfigured `helm' for searching info at point.
With a prefix-arg insert symbol at point."
(interactive "P")
(let ((helm-c-google-suggest-default-function
(helm :sources '(helm-c-source-info-elisp
:input (and arg (thing-at-point 'symbol))
:buffer "*helm info*")))
(provide 'helm-info)
;; Local Variables:
;; coding: utf-8
;; indent-tabs-mode: nil
;; byte-compile-dynamic: t
;; End:
;;; helm-info.el ends here
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