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emacs/lisp/word-help.el
Richard M. Stallman e8dd2298ce (word-help-mode-alist, reset-word-help) 
(word-help-switch-help-file): Added support for completion.
(word-help-complete, word-help-complete-list)
(word-help-complete-index, word-help-extract-matches)
(word-help-make-complete): New functions/variables for completion.
(word-help-mode-alist): Enhanced search regexps.
(word-help-index-mapper): Defaults now to extracting the first word.
(word-help-mode-alist, word-help-index-mapper)
(word-help-main-index, word-help-main-obarray)
(reset-word-help, set-help-file, word-help-process-indexes)
(word-help-goto-index-node): Doc fixes.
(word-help-goto-index-node): Requires passing the keyword.
Uses this in the a new and enhanced magic indexing routine.
(set-help-file, word-help): Handle `completion-ignore-case' better.
(word-help-extract-index): `case-fold-search' better handled.
(word-help): Magic guessing of relevant help file put in new
function word-help-find-help-file.
(word-help-guess-all): New subroutine.
(word-help-guess): Use word-help-guess-all.
May optionally copy only upto the cursor,
instead of the entire keyword.
1997-01-02 20:41:58 +00:00

971 lines
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;;; word-help.el --- keyword help for any language doc'd in TeXinfo.
;; Copyright (c) 1996 Free Software Foundation, Inc.
;; Maintainer: Jens T. Berger Thielemann, <jensthi@ifi.uio.no>
;; Keywords: help, keyword, languages, completion
;; This file is part of GNU Emacs.
;; 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 2, 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; This package provides a rather general interface for doing keyword
;; help in most languages. In short, it'll determine which TeXinfo
;; file which is relevant for the current mode; cache the index and
;; use regexps to give you help on the keyword you're looking at.
;; Installation
;; ************
;; For the default setup to work for all supported modes, make sure
;; the Texinfo files from the following packages are installed:
;; Texinfo file | Available in archive or URL | Notes
;; autoconf.info | autoconf-2.10.tar.gz | -
;; bison.info | bison-1.25.tar.gz | -
;; libc.info | glibc-1.09.1.tar.gz | -
;; elisp.info | elisp-manual-19-2.4.tar.gz | -
;; latex.info | ftp://ftp.dante.de/pub/tex/info/latex2e-help-texinfo/latex2e.texi
;; groff.info | groff-1.10.tar.gz | -
;; m4.info | m4-1.4.tar.gz | -
;; make.info | make-3.75.tar.gz | -
;; perl.info | http://www.perl.com/CPAN/doc/manual/info/
;; simula.info | Mail bjort@ifi.uio.no | Written in Norwegian
;; texinfo.info | texinfo-3.9.tar.gz | -
;; BTW: We refer to Texinfo files by just their last component, not
;; with an absolute file name. You must thus set up
;; `Info-directory-list' and `Info-default-directory-list' so that
;; these can automatically be located.
;; Usage
;; *****
;;
;; Place the cursor over the function/variable/type/whatever you want
;; help on. Type "C-h C-i". `word-help' will then make a suggestion
;; to an index topic; press return to accept this. If not, you may use
;; tab-completion to find the topic you're interested in.
;; `word-help' is also able to do symbol completion via the
;; `word-help-complete' function. Bind this function to C-TAB by
;; adding the following line to your .emacs file:
;;
;; (global-set-key [?\M-\t] 'word-help-complete)
;;
;; Note that some modes automatically override this key; you may
;; therefore wish to either put the above statement in a hook or
;; associate the function with an other key.
;; Usually, `word-help' is able to determine the relevant Texinfo
;; file from looking at the buffer's `mode-name'; if not, you can use
;; the interactive function `set-help-file' to set this.
;; Customizing
;; ***********
;;
;; User interface
;; --------------
;;
;; Two variables control the behaviour of the user-interface of
;; `word-help': `word-help-split-window' and
;; `word-help-magic-index'. Do C-h v to get more information on
;; these.
;; Adding more Texinfo files
;; -------------------------
;;
;; Associations between mode-names and Texinfo files can be done
;; through the `word-help-mode-alist' variable, which defines an
;; `alist' making `set-help-file' able to initialize the necessary
;; variable.
;; NOTE: If you have to customize the regexps, it is *CRUCIAL* that
;; none of your regexps match the empty string! Not adhering to this
;; restriction will make `word-help' enter an infinite loop.
;; Contacting the author
;; *********************
;;
;; If you wish to contact me for any reason, please feel free to write
;; to:
;; Jens Berger
;; Spektrumveien 4
;; N-0666 Oslo
;; Norway
;;
;; E-mail: <jensthi@ifi.uio.no>
;; Have fun.
;;
;;; Code:
;;
(require 'info)
;;;--------------------
;;; USER OPTIONS
;;;--------------------
(defvar word-help-split-window t
"*Non-nil means that the info buffer will pop up in a separate window.
If nil, we will just switch to it.")
(defvar word-help-magic-index t
"*Non-nil means that the keyword will be searched for in the requested node.
This is done by determining whether the line the point is positioned
on after using `Info-goto-node', actually contains the keyword. If
not, we will search for the first occurence of the keyword. This may
help when the info file isn't correctly indexed.")
;;; ---- end of user configurable variables
;;;-------------------------
;;; ADVANCED USER OPTIONS
;;;-------------------------
(defvar word-help-mode-alist
'(
("autoconf"
(("autoconf" "Macro Index") ("m4" "Macro index"))
(("AC_\\([A-Za-z0-9_]+\\)" 1)
("[a-z]+"))
nil
nil
(("AC_\\([A-Za-z0-9_]+\\)" 1 nil (("^[A-Z_]+$")))
("[a-z_][a-z_]*" 0 nil (("^[a-z_]+$")))))
("Bison"
(("bison" "Index")
("libc" "Type Index" "Function Index" "Variable Index"))
(("%[A-Za-z]*")
("[A-Za-z_][A-Za-z0-9_]*"))
nil
nil
(("%[A-Za-z]*" nil nil (("^%")))
("[A-Za-z_][A-Za-z0-9_]*" nil nil (("[A-Za-z_][A-Za-z0-9_]*")))))
("YACC" . "Bison")
("C" (("libc" "Type Index" "Function Index" "Variable Index")))
("C++" . "C")
("Emacs-Lisp"
(("elisp" "Index"))
(("[^][ ()\n\t.\"'#]+"))
nil
nil
lisp-complete-symbol)
("LaTeX"
(("latex" "Command Index"))
(("\\\\\\(begin\\|end\\){\\([^}\n]+\\)}" 2 0)
("\\\\[A-Za-z]+")
("\\\\[^A-Za-z]")
("[A-Za-z]+"))
nil
nil
(("\\\\begin{\\([A-Za-z]*\\)" 1 "}" (("^[A-Za-z]+$")))
("\\\\end{\\([A-Za-z]*\\)" 1 "}" (("^[A-Za-z]+$")))
("\\\\renewcommand{\\(\\\\?[A-Za-z]*\\)" 1 "}" (("^\\\\[A-Za-z]+")))
("\\\\renewcommand\\(\\\\?[A-Za-z]*\\)" 1 "" (("^\\\\[A-Za-z]+")))
("\\\\renewenvironment{?\\([A-Za-z]*\\)" 1 "}"(("^[A-Za-z]+$")))
("\\\\[A-Za-z]*" 0 "" (("^\\\\[A-Za-z]+")))))
("latex" . "LaTeX")
("Nroff"
(("groff" "Macro Index" "Register Index" "Request Index"))
(("\\.[^A-Za-z]")
("\\.[A-Za-z]+")
("\\.\\([A-Za-z]+\\)" 1))
nil
nil
(("\\.[A-Za-z]*" nil nil (("^\\.[A-Za-z]+$")))
("\\.\\([A-Za-z]*\\)" 1 nil (("^[A-Za-z]+$")))))
("Groff" . "Nroff")
("m4"
(("m4" "Macro index"))
(("\\([mM]4_\\)?\\([A-Za-z_][A-Za-z_0-9]*\\)" 2))
nil
nil
(("[mM]4_\\([A-Za-z_]?[A-Za-z_0-9]*\\)" 1)
("[A-Za-z_][A-Za-z_0-9]*")))
("Makefile"
(("make" "Name Index"))
(("\\.[A-Za-z]+") ;; .SUFFIXES
("\\$[^()]") ;; $@
("\\$([^A-Za-z].)") ;; $(<@)
("\\$[\(\{]\\([a-zA-Z+]\\)" 1) ;; $(wildcard)
("[A-Za-z]+")) ;; foreach
nil
nil
(("\\.[A-Za-z]*" nil ":" (("^\\.[A-Za-z]+$")))
("\\$(\\([A-Z]*\\)" 1 ")" (("^[A-Z]")))
("[a-z]+" nil nil (("^[a-z]+$")))))
("Perl"
(("perl" "Variable Index" "Function Index"))
(("\\$[^A-Za-z^]") ;; $@
("\\$\\^[A-Za-z]?") ;; $^D
("\\$[A-Za-z][A-Za-z_0-9]+") ;; $foobar
("[A-Za-z_][A-Za-z_0-9]+")) ;; dbmopen
nil
nil
(("\\$[A-Za-z]*" nil nil (("^\\$[A-Za-z]+$"))) ;; $variable
("[A-Za-z_][A-Za-z_0-9]*" nil nil
(("^[A-Za-z_][A-Za-z_0-9]*$"))))) ;; function
("Simula" (("simula" "Index")) nil t)
("Ifi Simula" . "Simula")
("SIMULA" . "Simula")
("Texinfo"
(("texinfo" "Command and Variable Index"))
(("@\\([A-Za-z]+\\)" 1))
nil
nil
(("@\\([A-Za-z]*\\)" 1)))
)
"Assoc list between `mode-name' and Texinfo files.
The variable should be initialized with a list of elements with the
following form:
\(mode-name (word-help-info-files) (word-help-keyword-regexps)
word-help-ignore-case word-help-index-mapper
word-help-complete-list)
where `word-help-info-files', `word-help-keyword-regexps' and so
forth of course are the values which should be put in these variables
for this mode. Note that `mode-name' doesn't have to be a legal
mode-name; the user may use the call `set-help-file', where
`mode-name' will be used in the `completing-read'.
Example entry (for C):
\(\"C\" ((\"libc\" \"Type Index\" \"Function Index\" \"Variable Index\"))
((\"[A-Za-z_][A-Za-z0-9]+\")))
The two first variables must be initialized; the two remaining will
get default values if you omit them or set them to nil. The default
values are:
word-help-keyword-regexps: (\"[A-Za-z_][A-Za-z0-9]+\")
word-help-ignore-case: nil
More settings may be defined in the future.
You may also define aliases, if there are several relevant mode-names
to a single entry. These should be of the form:
\(MODE-NAME-ALIAS . MODE-NAME-REAL)
For C++, you would use the alias
\(\"C++\" . \"C\")
to make C++ mode use the same help files as C files do. Please note
that you can shoot yourself in the foot with this possibility, by
defining recursive aliases.")
;;; --- end of advanced user options
(defvar word-help-ignore-case nil
"Non-nil means that case is ignored when doing lookup.")
(make-variable-buffer-local 'word-help-ignore-case)
(defvar word-help-info-files nil
"List of info files with respective nodes, for the current mode.
This should be a list of the following form:
\((INFO-FILE-1 NODE-NAME-1 NODE-NAME-2 ...)
(INFO-FILE-1 NODE-NAME-1 NODE-NAME-2 ...)
: : :
(INFO-FILE-1 NODE-NAME-1 NODE-NAME-2 ...))
An example entry for e.g. C would be:
\((\"/local/share/gnu/info/libc\" \"Function Index\" \"Type Index\"
\"Variable Index\"))
The files and nodes will be searched/cached in the order specified.
This variable is usually set by the `word-help-switch-help-file'
function, which utilizes the `word-help-mode-alist'.")
(make-variable-buffer-local 'word-help-info-files)
(defvar word-help-keyword-regexps nil
"Regexps for finding keywords in the current mode.
This is constructed as a list of the following form:
\((REGEXP SUBMATCH-LOOKUP SUBMATCH-CURSOR)
(REGEXP SUBMATCH-LOOKUP SUBMATCH-CURSOR)
: : :
(REGEXP SUBMATCH-LOOKUP SUBMATCH-CURSOR))
The regexps will be searched in order for a match which the cursor is
within.
submatch-lookup is the submatch number which will be looked for in the
index. May be omitted; defaults to 0 (e.g. the entire pattern). This is
useful in for instance configure lookup; each command is there prefixed
with 'AC_', which must be ignored when doing a lookup. Example regexp
entry for this:
\(\"AC_\\\\([A-Za-z0-9]+\\\\)\" 1)
submatch-cursor is the part of the match which the cursor must be within.
May be omitted; defaults to 0 (e.g. the entire pattern).")
(make-variable-buffer-local 'word-help-keyword-regexps)
(set-default 'word-help-keyword-regexps '(("[A-Za-z_][A-Za-z_0-9]*")))
(defvar word-help-index-mapper nil
"Regexps to use for massaging index-entries into keywords.
This variable should contain a list of regexps with sub-expressions,
where we will only look for the sub-expression in the user text.
The regexp list should be formatted as:
((REGEXP SUBEXP) (REGEXP SUBEXP) ... )
If the index entry does not match any of the regexps, it will be ignored.
Example:
Perl has index entries of the following form:
* abs VALUE: perlfunc.
* accept NEWSOCKET,GENERICSOCKET: perlfunc.
* alarm SECONDS: perlfunc.
* atan2 Y,X: perlfunc.
* bind SOCKET,NAME: perlfunc.
: : :
We will thus try to extract the first word in the index entry -
\"abs\" from \"abs VALUE\", etc. This is done by the following entry:
\((\"^\\\\([^ \\t\\n]+\\\\)\" 1))
This value is btw. the default one, and works with most Texinfo files")
(make-variable-buffer-local 'word-help-index-mapper)
(set-default 'word-help-index-mapper '(("^\\([^ \t\n]+\\)" 1)))
(defvar word-help-complete-list nil
"Regexps or function to use for completion of symbols.
The list should have the following format:
((REGEXP SUBMATCH TEXT-APPEND (RE-FILTER-1 REG-FILTER-2 ...)
: : : : :
(REGEXP SUBMATCH TEXT-APPEND (RE-FILTER-1 REG-FILTER-2 ...))
The two first entries are similar to `word-help-keyword-regexps',
REGEXP is a regular expression which should match any relevant
expression, and where SUBMATCH should be used for look up. By
specifying non-nil REGEXP-FILTERs, we'll only include entries in the
index which matches the regexp specified.
If the contents of this variable is a symbol of a function, this
function will be called instead. This is useful for modes providing
a more intelligent function (like `lisp-complete-symbol' in Emacs Lisp mode).
If you would like to use another function instead, you may.
Non-nil TEXT-APPEND means that this text will be inserted after the
completion, if we manage to do make a completion.")
(make-variable-buffer-local 'word-help-complete-list)
(set-default 'word-help-complete-list '(("[A-Za-z_][A-Za-z_0-9]*")))
;;; Work variables
(defvar word-help-main-index nil
"List of all index entries.
See `word-help-process-indexes' for structure formatting.
Minor note: This variable is a list if it is initialized, t if
initializing failed and nil if uninitialized.")
(make-variable-buffer-local 'word-help-main-index)
(defvar word-help-complete-index nil
"List of regexps for completion, with matching index entries.
Value is nil if uninitialized, t if initialized but not accessible,
a list if we're feeling ok.")
(make-variable-buffer-local 'word-help-complete-index)
(defvar word-help-main-obarray nil
"Global work variable for `word-help' system.
Do Not mess with this!")
(defvar word-help-history nil
"History for `word-help' minibuffer queries.")
(make-local-variable 'word-help-history)
(defvar word-help-current-help-file nil
"Current help file active for this mode.")
(defvar word-help-index-alist nil
"An assoc list mapping help files to info indexes.
This means that `word-help-mode-index' can be init'ed faster.")
(defvar word-help-help-mode nil
"Which mode the help system is bound to for the current mode.")
(make-variable-buffer-local 'word-help-help-mode)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;; User Functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Debugging
;;;###autoload
(defun reset-word-help ()
"Clear all cached indexes in the `word-help' system.
You should only need this when installing new info files, and/or
adding more Texinfo files to the `word-help' system."
(interactive)
(setq word-help-index-alist nil
word-help-main-index nil
word-help-info-files nil
word-help-complete-index nil))
;;; Changing help file
;;;###autoload
(defun set-help-file ()
"Change which set of Texinfo files used for word-help.
`word-help' maintains a list over which Texinfo files which are
relevant for each programming language (`word-help-mode-alist'). It
usually selects the correct one, based upon the value of `mode-name'.
If this guess is incorrect, you may also use this function manually to
instruct future `word-help' calls which Texinfo files to use."
(interactive)
(let (helpfile helpguess (completion-ignore-case t))
;; Try to make a guess
(setq helpguess (cond
(word-help-current-help-file)
((word-help-guess-help-file))))
;; Ask the user
(setq helpfile (completing-read
(if helpguess
(format "Select help mode (default %s): " helpguess)
"Select help mode: ")
word-help-mode-alist
nil t nil nil))
(if (equal "" helpfile)
(setq helpfile helpguess))
(if helpfile
(word-help-switch-help-file helpfile))))
;;; Main user interface
;;;###autoload
(defun word-help ()
"Find documentation on the keyword under the cursor.
The determination of which language the keyword belongs to, is based upon
The relevant info file is selected by matching `mode-name' (the major
mode) against the assoc list `word-help-mode-alist'.
If this is not possible, `set-help-file' will be invoked for selecting
the relevant info file. `set-help-file' may also be invoked
interactively by the user.
If the keyword you are looking at is not available in any index, no
default suggestion will be presented. "
(interactive)
(let (myguess guess index-info
(completion-ignore-case word-help-ignore-case))
;; Set necessary variables for later lookup
(word-help-find-help-file)
;; Have we previously cached datas?
(word-help-process-indexes)
(if
(atom word-help-main-index)
(message "No help file available for this mode.")
;; First make a guess at what the user is looking for
(setq myguess (word-help-guess
(point)
(cond
((not (atom word-help-main-index))
(car word-help-main-index)))
word-help-keyword-regexps))
;; Ask the user himself
(setq guess (completing-read
; Format string
(if myguess
(format "Look up keyword (default %s): " myguess)
"Look up keyword: ")
; Collection
(car word-help-main-index)
nil t nil 'word-help-history))
(if (equal guess "")
(setq guess myguess))
;; If we've got anything meaningful to lookup, do so
(if (not guess)
(message "Help aborted.")
(setq index-info (word-help-find-index-node
guess
word-help-main-index))
(if (not index-info)
(message "Oops, I could not find \"%s\" anyway! Bug?" guess)
(word-help-goto-index-node (nconc index-info (list guess))))))))
;;;###autoload
(defun word-help-complete ()
"Perform completion on the symbol preceding the point.
The determination of which language the keyword belongs to, is based upon
The relevant info file is selected by matching `mode-name' (the major
mode) against the assoc list `word-help-mode-alist'.
If this is not possible, `set-help-file' will be invoked for selecting
the relevant info file. `set-help-file' may also be invoked
interactively by the user.
The keywords are extracted from the index of the info file defined for
this mode, by using the `word-help-complete-list' variable."
(interactive)
(word-help-make-complete)
(cond
((not word-help-complete-index)
(message "No completion available for this mode."))
((symbolp word-help-complete-index)
(call-interactively word-help-complete-index))
((listp word-help-complete-index)
(let ((all-match (word-help-guess-all (point)
word-help-complete-index t))
(completion-ignore-case word-help-ignore-case)
(c-list word-help-complete-index)
c-entry word-match completion completed)
;; Loop over and try to find a match
(while (and all-match (not completed))
(setq word-match (car all-match)
c-entry (car c-list)
c-list (cdr c-list)
all-match (cdr all-match))
;; Check whether the current pattern matched
(if word-match
(let ((close (nth 3 c-entry))
(words (nth 4 c-entry)))
;; Find the maximum completion for this word
; (print word-match)
; (print c-entry)
; (print close)
(setq completion (try-completion word-match words))
;; Was the match exact
(cond ((eq completion t)
(and close
(not (looking-at (regexp-quote close)))
(insert close))
(setq completed t))
;; Silently ignore non-matches
((not completion))
;; May we complete more unambiguously
((not (string-equal completion word-match))
(delete-region (- (point) (length word-match))
(point))
(insert completion)
(if (eq t (try-completion completion words))
(progn
(and close
(not (looking-at (regexp-quote close)))
(insert close))))
(setq completed t))
(t
(message "Making completion list...")
(let ((list (all-completions word-match words nil)))
(setq completed list)
(with-output-to-temp-buffer "*Completions*"
(display-completion-list list)))
(message "Making completion list...done"))))))
(if (not completed) (message "No match."))))
(t (message "No completion available for this mode."))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;; Index mapping ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun word-help-map-index-entries (str re-list)
"Transform an Info index entry into a programming keyword.
Uses this by mapping the entries through `word-help-index-mapper'."
(let ((regexp (car (car re-list)))
(subexp (car (cdr (car re-list))))
(next (cdr re-list)))
(cond
((string-match regexp str)
(substring str (match-beginning subexp) (match-end subexp)))
(next
(word-help-map-index-entries str next)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;; Switch mode files ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Mode lookup
(defun word-help-guess-help-file ()
"Guesses a relevant help file based on mode name.
Returns nil if no guess could be made. Uses `word-help-mode-alist'."
(let (guess)
(cond
((setq guess (assoc mode-name word-help-mode-alist))
(car guess)))))
(defun word-help-switch-help-file (helpfile)
"Changes the help-file to the mode name given.
Uses `word-help-mode-alist'."
(if helpfile
(let (helpdesc)
(if (not (setq helpdesc (assoc helpfile word-help-mode-alist)))
(message "No help defined for \"%s\"." helpfile)
(if (stringp (cdr helpdesc))
(word-help-switch-help-file (cdr helpdesc))
(word-help-make-default-map
helpdesc
(list 'word-help-help-mode
'word-help-info-files
'word-help-keyword-regexps
'word-help-ignore-case
'word-help-index-mapper
'word-help-complete-list))))
(setq word-help-main-index nil
word-help-complete-index nil))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;; Index collection ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun word-help-extract-index (file-name index-list index-map ignore-case)
"Extract index from filename and the first node name in index list.
`file-name' is the name of the info file, while `index-list' is a list
of node-names to search."
(let (cmd1 cmdlow nodename ob-array next (case-fold-search word-help-ignore-case))
(setq nodename (car index-list))
(setq ob-array (make-vector 211 0))
(message "Processing \"%s\" in %s..." nodename file-name)
(save-window-excursion
(Info-goto-node (concat "(" file-name ")" nodename))
(end-of-buffer)
(while (re-search-backward "\\* \\([^\n:]+\\):" nil t)
(setq cmd1 (buffer-substring (match-beginning 1) (match-end 1)))
(setq cmdlow (if ignore-case (downcase cmd1) cmd1))
(if index-map
(setq cmdlow (word-help-map-index-entries cmdlow
index-map)))
;; We have to do this workaround to support case-insensitive matching
(cond
(cmdlow
(put (intern cmdlow ob-array) 'word-help-real-name cmd1)
(intern cmdlow word-help-main-obarray)))))
(setq next (cond
((cdr index-list)
(word-help-extract-index file-name (cdr index-list)
index-map ignore-case))))
(nconc (list (list nodename ob-array)) next)))
(defun word-help-collect-indexes (info-file)
"Process all the indexes in an info file.
Uses `word-help-extract-index' on each node, and returns an entry
suitable for merging into `word-help-process-indexes'. `info-file'
is an entry of the form
\(FILE-NAME INDEX-NAME-1 INDEX-NAME-2 ...)"
(let ((file (car info-file))
(nodes (cdr info-file)))
(nconc (list file) (word-help-extract-index file nodes
word-help-index-mapper
word-help-ignore-case))))
(defun word-help-process-indexes ()
"Process all the entries in the global variable `word-help-info-files'.
Returns a list formatted as follows:
\(all-entries-ob
(file-name-1 (node-name-1 this-node-entries-ob)
(node-name-2 this-node-entries-ob)
: : :
(node-name-n this-node-entries-ob))
(file-name-2 (node-name-1 this-node-entries-ob)
(node-name-2 this-node-entries-ob)
: : :
(node-name-n this-node-entries-ob))
: : : : : : : : :
(file-name-n (node-name-1 this-node-entries-ob)
(node-name-2 this-node-entries-ob)
: : :
(node-name-n this-node-entries-ob)))
The symbols in the obarrays may contain the additional property
`word-help-real-name', which tells the *real* node to go to.
Note that we use `word-help-index-alist' to speed up the process. Note
that `word-help-switch-help-file' must have been called before this function.
This structure is then later searched by `word-help-find-index-node'."
(let (index-words old-index)
(if (not word-help-main-index)
(cond
((setq old-index
(assoc word-help-help-mode word-help-index-alist))
(setq word-help-main-index (nth 1 old-index)))
(word-help-info-files
(setq word-help-main-obarray (make-vector 307 0)
index-words (mapcar 'word-help-collect-indexes
word-help-info-files)
word-help-main-index
(append (list word-help-main-obarray) index-words))
(setq word-help-index-alist (cons (list word-help-help-mode
word-help-main-index)
word-help-index-alist)))
(t (setq word-help-main-index t))))))
(defun word-help-find-help-file ()
"Tries to find and set a relevant help file for the current mode."
(let (helpguess)
(if (not word-help-info-files)
(if (setq helpguess (word-help-guess-help-file))
(word-help-switch-help-file helpguess)
(set-help-file)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;; Keyword guess ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun word-help-guess-all (cur-point re-list
&optional copy-to-point)
"Guesses *all* keywords the user possibly may be looking at.
Returns a list of all possible keywords. "
(let ((regexp (car (car re-list)))
(submatch (cond ((nth 1 (car re-list))) (0)))
(cursmatch (cond ((nth 2 (car re-list))) (0)))
(guess nil)
(next-guess nil)
(case-fold-search word-help-ignore-case)
(end-point nil))
(save-excursion
(end-of-line)
(setq end-point (point))
;; Start at the beginning
(beginning-of-line)
(while (and (not guess) (re-search-forward regexp end-point t))
;; Look whether the cursor is within the match
(if (and (<= (match-beginning cursmatch) cur-point)
(>= (match-end cursmatch) cur-point))
(if (or (not copy-to-point) (<= cur-point (match-end submatch)))
(setq guess (buffer-substring (match-beginning submatch)
(if copy-to-point
cur-point
(match-end submatch)))))))
;; If we found anything, return it and call ourselves again
(if (cdr re-list)
(setq next-guess (word-help-guess-all cur-point (cdr re-list)
copy-to-point))))
(cons guess next-guess)))
(defun word-help-guess-match (all-match cmd-array)
(let ((sym (car all-match)))
(cond
((and sym (intern-soft (if word-help-ignore-case
(downcase sym)
sym) cmd-array)
sym))
((cdr all-match)
(word-help-guess-match (cdr all-match) cmd-array)))))
(defun word-help-guess (cur-point cmd-array re-list)
"Guesses what keyword the user is looking at, and returns that.
CUR-POINT should be the current value of `point', CMD-ARRAY an obarray
of all the keywords which are defined for the current mode, and
RE-LIST a list of regexps use for the hunt. See also
`word-help-keyword-regexps'."
(let ((all-matches (word-help-guess-all cur-point re-list)))
; (print all-matches)
(word-help-guess-match all-matches cmd-array)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;; Show node for keyword ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Find an index entry
(defun word-help-find-index-node (node index-reg)
"Finds the node named `node' in the index-register `index-reg'.
`index-reg' has the format as returned (and documented) by the
`word-help-process-indexes' call. In most cases, this will be equal to
`word-help-main-index'.
Returns a list with format
(file-name index-node-name index-entry)
which contains the file and index where the entry can be found.
Returns nil if the entry can't be found."
(let (file-info node-name)
(setq node-name (cond (word-help-ignore-case (downcase node)) (node)))
(if (intern-soft node-name (car index-reg))
(setq file-info (word-help-index-search-file node-name
(cdr index-reg))))
file-info))
(defun word-help-index-search-file (entry file-data)
"Searches a cached file for the index-entry `entry'."
(let (this-file next-files file-name node node-infos)
(setq this-file (car file-data)
next-files (cdr file-data)
file-name (car this-file)
node-infos (cdr this-file)
node (word-help-index-search-nodes entry node-infos))
(cond
(node
(cons file-name node))
(next-files (word-help-index-search-file entry next-files)))))
(defun word-help-index-search-nodes (entry node-info)
"Searches a cached list of nodes for the entry `entry'."
(let (this-node next-nodes node-name node-ob node-sym)
(setq this-node (car node-info)
next-nodes (cdr node-info)
node-name (car this-node)
node-ob (car (cdr this-node))
node-sym (intern-soft entry node-ob))
(cond
(node-sym
(list node-name (get node-sym 'word-help-real-name)))
(next-nodes (word-help-index-search-nodes entry next-nodes)))))
;;; Switch to a node in an index
(defun word-help-goto-index-node (index-info)
"Jumps to an index node.
`index-info' should be a list with the following format:
\(FILE-NAME INDEX-NODE-NAME INDEX-ENTRY KEYWORD)"
(let* ((file-name (car index-info))
(node-name (nth 1 index-info))
(entry-name (nth 2 index-info))
(kw-name (nth 3 index-info))
(buffer (current-buffer)))
(if word-help-split-window
(pop-to-buffer nil))
(Info-goto-node (concat "(" file-name ")" node-name))
(Info-menu entry-name)
;; Do magic keyword search
(if word-help-magic-index
(let (end-point regs this-re found entry-re)
(setq entry-re (regexp-quote kw-name)
regs (list (concat
(if (string-match "^[A-Za-z]" entry-name)
"\\<" "")
entry-re
(if (string-match "[A-Za-z]$" entry-name)
"\\>" ""))
(concat "[`\"\(]" entry-re)
(concat "^" entry-re
(if (string-match "[A-Za-z]$" entry-name)
"\\>" ""))))
(end-of-line)
(setq end-point (point))
(beginning-of-line)
(if (not (re-search-forward (car regs) end-point t))
(while (and (not found) (car regs))
(setq this-re (car regs)
regs (cdr regs)
found (re-search-forward this-re nil t))))
(recenter 0)))
(if word-help-split-window
(pop-to-buffer buffer))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Completion ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun word-help-extract-matches (from-ob dest-ob re-list)
"Takes atoms from from-ob, and puts them in dest-ob if they match re-list."
(let ((regexp (car (car re-list))))
(mapatoms (lambda (x)
(if (or (not regexp) (string-match regexp (symbol-name x)))
(intern (symbol-name x) dest-ob)))
from-ob)
(if (cdr re-list)
(word-help-extract-matches from-ob dest-ob (cdr re-list))))
dest-ob)
(defun word-help-make-complete ()
"Generates the `word-help-complete-index'."
(if word-help-complete-index
nil
(word-help-find-help-file)
(cond
((symbolp word-help-complete-list)
(setq word-help-complete-index word-help-complete-list))
(t
(word-help-process-indexes)
(if (not (atom word-help-main-index))
(let ((from-ob (car word-help-main-index)))
(message "Processing keywords...")
(setq word-help-complete-index
(mapcar
(lambda (cmpl)
(let
((regexp (car cmpl))
(subm (cond ((nth 1 cmpl)) (0)))
(app (cond ((nth 2 cmpl)) ("")))
(re-list (cond ((nth 3 cmpl)) ('((".")))))
(obarr (make-vector 47 0)))
(list regexp subm subm app
(word-help-extract-matches from-ob obarr
re-list))))
word-help-complete-list))))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Misc. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Default mapping
(defun word-help-make-default-map (list vars)
"Makes a default mapping for `vars', which must be listed in order.
vars is a list of quoted symbols. If the nth entry in the list is
non-nil, the nth variable will be given this value. If nil, the var
will be given the global default value."
(set (car vars) (cond ((car list)) ((default-value (car vars)))))
(if (cdr vars)
(word-help-make-default-map (cdr list) (cdr vars))))
(provide 'word-help)
;;; word-help.el ends here
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