309 lines
11 KiB
EmacsLisp
309 lines
11 KiB
EmacsLisp
|
;;; helm-info.el --- Browse info index with helm -*- lexical-binding: t -*-
|
|||
|
|
|
|||
|
|
;; Copyright (C) 2012 ~ 2023 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 <http://www.gnu.org/licenses/>.
|
|||
|
|
|
|||
|
|
;;; Code:
|
|||
|
|
|
|||
|
|
(require 'cl-lib)
|
|||
|
|
(require 'helm)
|
|||
|
|
(require 'helm-lib)
|
|||
|
|
(require 'helm-utils)
|
|||
|
|
(require 'info)
|
|||
|
|
|
|||
|
|
(declare-function Info-index-nodes "info" (&optional file))
|
|||
|
|
(declare-function Info-goto-node "info" (&optional fork))
|
|||
|
|
(declare-function Info-find-node "info" (filename nodename &optional no-going-back))
|
|||
|
|
(declare-function ring-insert "ring")
|
|||
|
|
(declare-function ring-empty-p "ring")
|
|||
|
|
(declare-function ring-ref "ring")
|
|||
|
|
(defvar Info-history)
|
|||
|
|
(defvar Info-directory-list)
|
|||
|
|
;; `Info-minibuf-history' is not declared in Emacs, see emacs bug/58786.
|
|||
|
|
(when (and (> emacs-major-version 28)
|
|||
|
|
(not (boundp 'Info-minibuf-history)))
|
|||
|
|
(defvar Info-minibuf-history nil))
|
|||
|
|
|
|||
|
|
|
|||
|
|
;;; 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-get-attr 'info-file)))
|
|||
|
|
"Initialize candidates for info FILE.
|
|||
|
|
If FILE have nodes, loop through all nodes and accumulate candidates
|
|||
|
|
found in each node, otherwise scan only the current info buffer."
|
|||
|
|
;; Allow reinit candidate buffer when using edebug.
|
|||
|
|
(helm-aif (and debug-on-error
|
|||
|
|
(helm-candidate-buffer))
|
|||
|
|
(kill-buffer it))
|
|||
|
|
(unless (helm-candidate-buffer)
|
|||
|
|
(save-selected-window
|
|||
|
|
(info file " *helm info temp buffer*")
|
|||
|
|
(let ((tobuf (helm-candidate-buffer 'global))
|
|||
|
|
Info-history)
|
|||
|
|
(helm-aif (Info-index-nodes)
|
|||
|
|
(dolist (node it)
|
|||
|
|
(Info-goto-node node)
|
|||
|
|
(helm-info-scan-current-buffer tobuf))
|
|||
|
|
(helm-info-scan-current-buffer tobuf))
|
|||
|
|
(bury-buffer)))))
|
|||
|
|
|
|||
|
|
(defun helm-info-scan-current-buffer (tobuf)
|
|||
|
|
"Scan current info buffer and print lines to TOBUF.
|
|||
|
|
Argument TOBUF is the `helm-candidate-buffer'."
|
|||
|
|
(let (start end line)
|
|||
|
|
(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)
|
|||
|
|
;; Fix Bug#1503 by getting the invisible
|
|||
|
|
;; info displayed on next line in long strings.
|
|||
|
|
;; e.g "* Foo.\n (line 12)" instead of
|
|||
|
|
;; "* Foo.(line 12)"
|
|||
|
|
end (or (save-excursion
|
|||
|
|
(goto-char (point-at-bol))
|
|||
|
|
(re-search-forward "(line +[0-9]+)" nil t))
|
|||
|
|
(point-at-eol))
|
|||
|
|
;; Long string have a new line inserted before the
|
|||
|
|
;; invisible spec, remove it.
|
|||
|
|
line (replace-regexp-in-string
|
|||
|
|
"\n" "" (buffer-substring start end)))
|
|||
|
|
(with-current-buffer tobuf
|
|||
|
|
(insert line)
|
|||
|
|
(insert "\n"))))))
|
|||
|
|
|
|||
|
|
(defun helm-info-goto (node-line)
|
|||
|
|
"The helm-info action to jump to NODE-LINE."
|
|||
|
|
(let ((alive (buffer-live-p (get-buffer "*info*"))))
|
|||
|
|
(Info-goto-node (car node-line))
|
|||
|
|
(when alive (revert-buffer nil t))
|
|||
|
|
(helm-goto-line (cdr node-line))))
|
|||
|
|
|
|||
|
|
(defvar helm-info--node-regexp
|
|||
|
|
"^\\* +\\(.+\\):[[:space:]]+\\(.*\\)\\(?:[[:space:]]*\\)(line +\\([0-9]+\\))"
|
|||
|
|
"A regexp that should match file name, node name and line number in
|
|||
|
|
a line like this:
|
|||
|
|
|
|||
|
|
\* bind: Bash Builtins. (line 21).")
|
|||
|
|
|
|||
|
|
(defun helm-info-display-to-real (line)
|
|||
|
|
"Transform LINE to an acceptable argument for `info'.
|
|||
|
|
If line have a node use the node, otherwise use directly first name found."
|
|||
|
|
(let ((info-file (helm-get-attr 'info-file))
|
|||
|
|
nodename linum)
|
|||
|
|
(when (string-match helm-info--node-regexp line)
|
|||
|
|
(setq nodename (match-string 2 line)
|
|||
|
|
linum (match-string 3 line)))
|
|||
|
|
(if nodename
|
|||
|
|
(cons (format "(%s)%s"
|
|||
|
|
info-file
|
|||
|
|
(replace-regexp-in-string ":\\'" "" nodename))
|
|||
|
|
(string-to-number (or linum "1")))
|
|||
|
|
(cons (format "(%s)%s"
|
|||
|
|
info-file
|
|||
|
|
(helm-aand (replace-regexp-in-string "^* " "" line)
|
|||
|
|
(replace-regexp-in-string "::?.*\\'" "" it)))
|
|||
|
|
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-<NAME>' 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-<NAME>.
|
|||
|
|
Sources are generated for all entries of
|
|||
|
|
`helm-default-info-index-list'.
|
|||
|
|
If COMMANDS arg is non-nil, also build commands named
|
|||
|
|
`helm-info-<NAME>'.
|
|||
|
|
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'."
|
|||
|
|
(info-initialize) ; Build Info-directory-list from INFOPATH (Bug#2118)
|
|||
|
|
(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-<CANDIDATE>."
|
|||
|
|
(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 (&optional refresh)
|
|||
|
|
"Preconfigured `helm' for searching Info files' indices.
|
|||
|
|
|
|||
|
|
With a prefix argument \\[universal-argument], set REFRESH to
|
|||
|
|
non-nil.
|
|||
|
|
|
|||
|
|
Optional parameter REFRESH, when non-nil, re-evaluates
|
|||
|
|
`helm-default-info-index-list'. If the variable has been
|
|||
|
|
customized, set it to its saved value. If not, set it to its
|
|||
|
|
standard value. See `custom-reevaluate-setting' for more.
|
|||
|
|
|
|||
|
|
REFRESH is useful when new Info files are installed. If
|
|||
|
|
`helm-default-info-index-list' has not been customized, the new
|
|||
|
|
Info files are made available."
|
|||
|
|
(interactive "P")
|
|||
|
|
(let ((default (unless (ring-empty-p helm-info-searched)
|
|||
|
|
(ring-ref helm-info-searched 0))))
|
|||
|
|
(when refresh
|
|||
|
|
(custom-reevaluate-setting 'helm-default-info-index-list))
|
|||
|
|
(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."
|
|||
|
|
(or helm-info--pages-cache
|
|||
|
|
(let ((info-topic-regexp "\\* +\\([^:]+: ([^)]+)[^.]*\\)\\."))
|
|||
|
|
(save-selected-window
|
|||
|
|
(info "dir" " *helm info 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)
|
|||
|
|
helm-info--pages-cache))
|
|||
|
|
(kill-buffer)))))
|
|||
|
|
|
|||
|
|
;;;###autoload
|
|||
|
|
(defun helm-info-at-point ()
|
|||
|
|
"Preconfigured `helm' for searching info at point."
|
|||
|
|
(interactive)
|
|||
|
|
;; Symbol at point is used as default as long as one of the sources
|
|||
|
|
;; in `helm-info-default-sources' is member of
|
|||
|
|
;; `helm-sources-using-default-as-input'.
|
|||
|
|
(cl-loop for src in helm-info-default-sources
|
|||
|
|
for name = (if (symbolp src)
|
|||
|
|
(assoc 'name (symbol-value src))
|
|||
|
|
(assoc 'name src))
|
|||
|
|
unless name
|
|||
|
|
do (warn "Couldn't build source `%S' without its info file" src))
|
|||
|
|
(helm :sources helm-info-default-sources
|
|||
|
|
:buffer "*helm info*"))
|
|||
|
|
|
|||
|
|
(provide 'helm-info)
|
|||
|
|
|
|||
|
|
;;; helm-info.el ends here
|