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;;; checkdoc.el --- check documentation strings for style requirements
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;; Copyright (C) 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
;;   2008, 2009, 2010  Free Software Foundation, Inc.
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;; Author: Eric M. Ludlam <zappo@gnu.org>
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;; Version: 0.6.2
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;; Keywords: docs, maint, lisp
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;; This file is part of GNU Emacs.
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;; GNU Emacs 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
;; (at your option) any later version.
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;; GNU Emacs 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.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
;;
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;;   The Emacs Lisp manual has a nice chapter on how to write
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;; documentation strings.  Many stylistic suggestions are fairly
;; deterministic and easy to check for syntactically, but also easy
;; to forget.  The main checkdoc engine will perform the stylistic
;; checks needed to make sure these styles are remembered.
;;
;; There are two ways to use checkdoc:
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;;   1) Periodically use `checkdoc' or `checkdoc-current-buffer'.
;;      `checkdoc' is a more interactive version of
;;      `checkdoc-current-buffer'
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;;   2) Use `checkdoc-minor-mode' to automatically check your
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;;      documentation whenever you evaluate Lisp code with C-M-x
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;;      or [menu-bar emacs-lisp eval-buffer].  Additional key-bindings
;;      are also provided under C-c ? KEY
;;        (require 'checkdoc)
;;        (add-hook 'emacs-lisp-mode-hook
;;	             '(lambda () (checkdoc-minor-mode 1)))
;;
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;; Using `checkdoc':
;;
;;   The commands `checkdoc' and `checkdoc-ispell' are the top-level
;; entry points to all of the different checks that are available.  It
;; breaks examination of your Lisp file into four sections (comments,
;; documentation, messages, and spacing) and indicates its current
;; state in a status buffer.
;;
;;   The Comments check examines your headers, footers, and
;; various tags (such as "Code:") to make sure that your code is ready
;; for easy integration into existing systems.
;;
;;   The Documentation check deals with documentation strings
;; and their elements that help make Emacs easier to use.
;;
;;   The Messages check ensures that the strings displayed in the
;; minibuffer by some commands (such as `error' and `y-or-n-p')
;; are consistent with the Emacs environment.
;;
;;   The Spacing check cleans up white-space at the end of lines.
;;
;;   The interface while working with documentation and messages is
;; slightly different when being run in the interactive mode.  The
;; interface offers several options, including the ability to skip to
;; the next error, or back up to previous errors.  Auto-fixing is
;; turned off at this stage, but you can use the `f' or `F' key to fix
;; a given error (if the fix is available.)
;;
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;; Auto-fixing:
;;
;;   There are four classifications of style errors in terms of how
;; easy they are to fix.  They are simple, complex, really complex,
;; and impossible.  (Impossible really means that checkdoc does not
;; have a fixing routine yet.)  Typically white-space errors are
;; classified as simple, and are auto-fixed by default.  Typographic
;; changes are considered complex, and the user is asked if they want
;; the problem fixed before checkdoc makes the change.  These changes
;; can be done without asking if `checkdoc-autofix-flag' is properly
;; set.  Potentially redundant changes are considered really complex,
;; and the user is always asked before a change is inserted.  The
;; variable `checkdoc-autofix-flag' controls how these types of errors
;; are fixed.
;;
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;; Spell checking text:
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;;
;;   The variable `checkdoc-spellcheck-documentation-flag' can be set
;; to customize how spell checking is to be done.  Since spell
;; checking can be quite slow, you can optimize how best you want your
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;; checking done.  The default is `defun', which spell checks each time
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;; `checkdoc-defun' or `checkdoc-eval-defun' is used.  Setting to nil
;; prevents spell checking during normal usage.
;;   Setting this variable to nil does not mean you cannot take
;; advantage of the spell checking.  You can instead use the
;; interactive functions `checkdoc-ispell-*' to check the spelling of
;; your documentation.
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;;   There is a list of Lisp-specific words which checkdoc will
;; install into Ispell on the fly, but only if Ispell is not already
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;; running.  Use `ispell-kill-ispell' to make checkdoc restart it with
;; these words enabled.
;;
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;; Checking parameters:
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;;
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;;   You might not always want a function to have its parameters listed
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;; in order.  When this is the case, put the following comment just in
;; front of the documentation string: "; checkdoc-order: nil"  This
;; overrides the value of `checkdoc-arguments-in-order-flag'.
;;
;;   If you specifically wish to avoid mentioning a parameter of a
;; function in the doc string (such as a hidden parameter, or a
;; parameter which is very obvious like events), you can have checkdoc
;; skip looking for it by putting the following comment just in front
;; of the documentation string: "; checkdoc-params: (args go here)"
;;
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;; Checking message strings:
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;;
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;;   The text that follows the `error' and `y-or-n-p' commands is
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;; also checked.  The documentation for `error' clearly states some
;; simple style rules to follow which checkdoc will auto-fix for you.
;; `y-or-n-p' also states that it should end in a space.  I added that
;; it should end in "? " since that is almost always used.
;;
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;; Adding your own checks:
;;
;;   You can experiment with adding your own checks by setting the
;; hooks `checkdoc-style-hooks' and `checkdoc-comment-style-hooks'.
;; Return a string which is the error you wish to report.  The cursor
;; position should be preserved.
;;
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;; Error errors:
;;
;;   Checkdoc does not always flag errors correctly.  There are a
;; couple ways you can coax your file into passing all of checkdoc's
;; tests through buffer local variables.
;;
;;   The variable `checkdoc-verb-check-experimental-flag' can be used
;; to turn off the check for verb-voice in case you use words that are
;; not semantically verbs, but are still in the incomplete list.
;;
;;   The variable `checkdoc-symbol-words' can be a list of words that
;; happen to also be symbols.  This is not a problem for one-word
;; symbols, but if you use a hyphenated word that is also a symbol,
;; then you may need this.
;;
;;   The symbol `checkdoc-force-docstrings-flag' can be set to nil if
;; you have many undocumented functions you don't wish to document.
;;
;;   See the above section "Checking Parameters" for details about
;; parameter checking.
;;
;; Dependencies:
;;
;;   This file requires lisp-mnt (Lisp maintenance routines) for the
;;   comment checkers.
;;
;;   Requires custom for Emacs v20.
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;;; TO DO:
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;;   Hook into the byte compiler on a defun/defvar level to generate
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;;     warnings in the byte-compiler's warning/error buffer.
;;   Better ways to override more typical `eval' functions.  Advice
;;     might be good but hard to turn on/off as a minor mode.
;;
;;; Maybe Do:
;;   Code sweep checks for "forbidden functions", proper use of hooks,
;;     proper keybindings, and other items from the manual that are
;;     not specifically docstring related.  Would this even be useful?

;;; Code:
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(defvar checkdoc-version "0.6.1"
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  "Release version of checkdoc you are currently running.")

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(require 'help-mode) ;; for help-xref-info-regexp
(require 'thingatpt) ;; for handy thing-at-point-looking-at

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(defvar compilation-error-regexp-alist)
(defvar compilation-mode-font-lock-keywords)

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(defgroup checkdoc nil
  "Support for doc string checking in Emacs Lisp."
  :prefix "checkdoc"
  :group 'lisp
  :version "20.3")

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(defcustom checkdoc-minor-mode-string " CDoc"
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  "String to display in mode line when Checkdoc mode is enabled; nil for none."
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  :type '(choice string (const :tag "None" nil))
  :group 'checkdoc
  :version "23.1")

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(defcustom checkdoc-autofix-flag 'semiautomatic
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  "Non-nil means attempt auto-fixing of doc strings.
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If this value is the symbol `query', then the user is queried before
any change is made.  If the value is `automatic', then all changes are
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made without asking unless the change is very-complex.  If the value
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is `semiautomatic' or any other value, then simple fixes are made
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without asking, and complex changes are made by asking the user first.
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The value `never' is the same as nil, never ask or change anything."
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  :group 'checkdoc
  :type '(choice (const automatic)
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          (const query)
          (const never)
          (other :tag "semiautomatic" semiautomatic)))
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(defcustom checkdoc-bouncy-flag t
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  "Non-nil means to \"bounce\" to auto-fix locations.
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Setting this to nil will silently make fixes that require no user
interaction.  See `checkdoc-autofix-flag' for auto-fixing details."
  :group 'checkdoc
  :type 'boolean)

(defcustom checkdoc-force-docstrings-flag t
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  "Non-nil means that all checkable definitions should have documentation.
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Style guide dictates that interactive functions MUST have documentation,
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and that it's good but not required practice to make non user visible items
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have doc strings."
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  :group 'checkdoc
  :type 'boolean)
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;;;###autoload(put 'checkdoc-force-docstrings-flag 'safe-local-variable 'booleanp)
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(defcustom checkdoc-force-history-flag nil
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  "Non-nil means that files should have a History section or ChangeLog file.
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This helps document the evolution of, and recent changes to, the package."
  :group 'checkdoc
  :type 'boolean)
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;;;###autoload(put 'checkdoc-force-history-flag 'safe-local-variable 'booleanp)
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(defcustom checkdoc-permit-comma-termination-flag nil
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  "Non-nil means the first line of a docstring may end with a comma.
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Ordinarily, a full sentence is required.  This may be misleading when
there is a substantial caveat to the one-line description -- the comma
should be used when the first part could stand alone as a sentence, but
it indicates that a modifying clause follows."
  :group 'checkdoc
  :type 'boolean)
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;;;###autoload(put 'checkdoc-permit-comma-termination-flag 'safe-local-variable 'booleanp)
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(defcustom checkdoc-spellcheck-documentation-flag nil
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  "Non-nil means run Ispell on text based on value.
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This is automatically set to nil if Ispell does not exist on your
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system.  Possible values are:

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  nil         - Don't spell-check during basic style checks.
  defun       - Spell-check when style checking a single defun
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  buffer      - Spell-check when style checking the whole buffer
  interactive - Spell-check during any interactive check.
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  t           - Always spell-check"
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  :group 'checkdoc
  :type '(choice (const nil)
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          (const defun)
          (const buffer)
          (const interactive)
          (const t)))
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(defvar checkdoc-ispell-lisp-words
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  '("alist" "emacs" "etags" "keymap" "paren" "regexp" "sexp" "xemacs")
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  "List of words that are correct when spell-checking Lisp documentation.")
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(defcustom checkdoc-max-keyref-before-warn 10
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  "The number of \\ [command-to-keystroke] tokens allowed in a doc string.
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Any more than this and a warning is generated suggesting that the construct
\\ {keymap} be used instead."
  :group 'checkdoc
  :type 'integer)

(defcustom checkdoc-arguments-in-order-flag t
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  "Non-nil means warn if arguments appear out of order.
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Setting this to nil will mean only checking that all the arguments
appear in the proper form in the documentation, not that they are in
the same order as they appear in the argument list.  No mention is
made in the style guide relating to order."
  :group 'checkdoc
  :type 'boolean)
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;;;###autoload(put 'checkdoc-arguments-in-order-flag 'safe-local-variable 'booleanp)
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(defvar checkdoc-style-hooks nil
  "Hooks called after the standard style check is completed.
All hooks must return nil or a string representing the error found.
Useful for adding new user implemented commands.

Each hook is called with two parameters, (DEFUNINFO ENDPOINT).
DEFUNINFO is the return value of `checkdoc-defun-info'.  ENDPOINT is the
location of end of the documentation string.")

(defvar checkdoc-comment-style-hooks nil
  "Hooks called after the standard comment style check is completed.
Must return nil if no errors are found, or a string describing the
problem discovered.  This is useful for adding additional checks.")

(defvar checkdoc-diagnostic-buffer "*Style Warnings*"
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  "Name of warning message buffer.")
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(defvar checkdoc-defun-regexp
  "^(def\\(un\\|var\\|custom\\|macro\\|const\\|subst\\|advice\\)\
\\s-+\\(\\(\\sw\\|\\s_\\)+\\)[ \t\n]+"
  "Regular expression used to identify a defun.
A search leaves the cursor in front of the parameter list.")

(defcustom checkdoc-verb-check-experimental-flag t
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  "Non-nil means to attempt to check the voice of the doc string.
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This check keys off some words which are commonly misused.  See the
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variable `checkdoc-common-verbs-wrong-voice' if you wish to add your own."
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  :group 'checkdoc
  :type 'boolean)

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(defvar checkdoc-generate-compile-warnings-flag nil
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  "Non-nil means generate warnings in a buffer for browsing.
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Do not set this by hand, use a function like `checkdoc-current-buffer'
with a universal argument.")

(defcustom checkdoc-symbol-words nil
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  "A list of symbol names (strings) which also happen to make good words.
These words are ignored when unquoted symbols are searched for.
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This should be set in an Emacs Lisp file's local variables."
  :group 'checkdoc
  :type '(repeat (symbol :tag "Word")))
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;;;###autoload(put 'checkdoc-symbol-words 'safe-local-variable 'checkdoc-list-of-strings-p)

;;;###autoload
(defun checkdoc-list-of-strings-p (obj)
  ;; this is a function so it might be shared by checkdoc-proper-noun-list
  ;; and/or checkdoc-ispell-lisp-words in the future
  (and (listp obj)
       (not (memq nil (mapcar 'stringp obj)))))
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(defvar checkdoc-proper-noun-list
  '("ispell" "xemacs" "emacs" "lisp")
  "List of words (not capitalized) which should be capitalized.")

(defvar checkdoc-proper-noun-regexp
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  ;; "[.!?]" is for noun at end of a sentence, since those chars
  ;; are symbol syntax in emacs-lisp-mode and so don't match \\_>.
  ;; The \" allows it to be the last sentence in a docstring too.
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  (concat "\\_<"
	  (regexp-opt checkdoc-proper-noun-list t)
	  "\\(\\_>\\|[.!?][ \t\n\"]\\)")
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  "Regular expression derived from `checkdoc-proper-noun-regexp'.")

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(defvar checkdoc-common-verbs-regexp nil
  "Regular expression derived from `checkdoc-common-verbs-regexp'.")

(defvar checkdoc-common-verbs-wrong-voice
  '(("adds" . "add")
    ("allows" . "allow")
    ("appends" . "append")
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    ("applies" . "apply")
    ("arranges" . "arrange")
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    ("brings" . "bring")
    ("calls" . "call")
    ("catches" . "catch")
    ("changes" . "change")
    ("checks" . "check")
    ("contains" . "contain")
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    ("converts" . "convert")
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    ("creates" . "create")
    ("destroys" . "destroy")
    ("disables" . "disable")
    ("executes" . "execute")
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    ("evals" . "evaluate")
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    ("evaluates" . "evaluate")
    ("finds" . "find")
    ("forces" . "force")
    ("gathers" . "gather")
    ("generates" . "generate")
    ("goes" . "go")
    ("guesses" . "guess")
    ("highlights" . "highlight")
    ("holds" . "hold")
    ("ignores" . "ignore")
    ("indents" . "indent")
    ("initializes" . "initialize")
    ("inserts" . "insert")
    ("installs" . "install")
    ("investigates" . "investigate")
    ("keeps" . "keep")
    ("kills" . "kill")
    ("leaves" . "leave")
    ("lets" . "let")
    ("loads" . "load")
    ("looks" . "look")
    ("makes" . "make")
    ("marks" . "mark")
    ("matches" . "match")
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    ("moves" . "move")
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    ("notifies" . "notify")
    ("offers" . "offer")
    ("parses" . "parse")
    ("performs" . "perform")
    ("prepares" . "prepare")
    ("prepends" . "prepend")
    ("reads" . "read")
    ("raises" . "raise")
    ("removes" . "remove")
    ("replaces" . "replace")
    ("resets" . "reset")
    ("restores" . "restore")
    ("returns" . "return")
    ("runs" . "run")
    ("saves" . "save")
    ("says" . "say")
    ("searches" . "search")
    ("selects" . "select")
    ("sets" . "set")
    ("sex" . "s*x")
    ("shows" . "show")
    ("signifies" . "signify")
    ("sorts" . "sort")
    ("starts" . "start")
    ("stores" . "store")
    ("switches" . "switch")
    ("tells" . "tell")
    ("tests" . "test")
    ("toggles" . "toggle")
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    ("tries" . "try")
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    ("turns" . "turn")
    ("undoes" . "undo")
    ("unloads" . "unload")
    ("unmarks" . "unmark")
    ("updates" . "update")
    ("uses" . "use")
    ("yanks" . "yank")
    )
  "Alist of common words in the wrong voice and what should be used instead.
Set `checkdoc-verb-check-experimental-flag' to nil to avoid this costly
and experimental check.  Do not modify this list without setting
the value of `checkdoc-common-verbs-regexp' to nil which cause it to
be re-created.")

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(defvar checkdoc-syntax-table
  (let ((st (make-syntax-table emacs-lisp-mode-syntax-table)))
    ;; When dealing with syntax in doc strings, make sure that - are
    ;; encompassed in words so we can use cheap \\> to get the end of a symbol,
    ;; not the end of a word in a conglomerate.
    (modify-syntax-entry ?- "w" checkdoc-syntax-table)
    st)
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  "Syntax table used by checkdoc in document strings.")

;;; Compatibility
;;
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(defalias 'checkdoc-make-overlay
  (if (featurep 'xemacs) 'make-extent 'make-overlay))
(defalias 'checkdoc-overlay-put
  (if (featurep 'xemacs) 'set-extent-property 'overlay-put))
(defalias 'checkdoc-delete-overlay
  (if (featurep 'xemacs) 'delete-extent 'delete-overlay))
(defalias 'checkdoc-overlay-start
  (if (featurep 'xemacs) 'extent-start 'overlay-start))
(defalias 'checkdoc-overlay-end
  (if (featurep 'xemacs) 'extent-end 'overlay-end))
(defalias 'checkdoc-mode-line-update
  (if (featurep 'xemacs) 'redraw-modeline 'force-mode-line-update))
(defalias 'checkdoc-char=
  (if (featurep 'xemacs) 'char= '=))
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;;; User level commands
;;
;;;###autoload
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(defun checkdoc ()
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  "Interactively check the entire buffer for style errors.
The current status of the check will be displayed in a buffer which
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the users will view as each check is completed."
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  (interactive)
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  (let ((status (list "Checking..." "-" "-" "-"))
	(checkdoc-spellcheck-documentation-flag
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	 (car (memq checkdoc-spellcheck-documentation-flag
                    '(buffer interactive t))))
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	;; if the user set autofix to never, then that breaks the
	;; obviously requested asking implied by using this function.
	;; Set it to paranoia level.
	(checkdoc-autofix-flag (if (or (not checkdoc-autofix-flag)
				       (eq checkdoc-autofix-flag 'never))
				   'query
				 checkdoc-autofix-flag))
	tmp)
    (checkdoc-display-status-buffer status)
    ;; check the comments
    (if (not buffer-file-name)
	(setcar status "Not checked")
      (if (checkdoc-file-comments-engine)
	  (setcar status "Errors")
	(setcar status "Ok")))
    (setcar (cdr status) "Checking...")
    (checkdoc-display-status-buffer status)
    ;; Check the documentation
    (setq tmp (checkdoc-interactive nil t))
    (if tmp
	(setcar (cdr status) (format "%d Errors" (length tmp)))
      (setcar (cdr status) "Ok"))
    (setcar (cdr (cdr status)) "Checking...")
    (checkdoc-display-status-buffer status)
    ;; Check the message text
    (if (setq tmp (checkdoc-message-interactive nil t))
	(setcar (cdr (cdr status)) (format "%d Errors" (length tmp)))
      (setcar (cdr (cdr status)) "Ok"))
    (setcar (cdr (cdr (cdr status))) "Checking...")
    (checkdoc-display-status-buffer status)
    ;; Rogue spacing
    (if (condition-case nil
	    (checkdoc-rogue-spaces nil t)
	  (error t))
	(setcar (cdr (cdr (cdr status))) "Errors")
      (setcar (cdr (cdr (cdr status))) "Ok"))
    (checkdoc-display-status-buffer status)))

(defun checkdoc-display-status-buffer (check)
  "Display and update the status buffer for the current checkdoc mode.
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CHECK is a list of four strings stating the current status of each
test; the nth string describes the status of the nth test."
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  (let (temp-buffer-setup-hook)
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    (with-output-to-temp-buffer "*Checkdoc Status*"
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      (mapc #'princ
            (list "Buffer comments and tags:  " (nth 0 check)
                  "\nDocumentation style:       " (nth 1 check)
                  "\nMessage/Query text style:  " (nth 2 check)
                  "\nUnwanted Spaces:           " (nth 3 check)))))
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  (shrink-window-if-larger-than-buffer
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   (get-buffer-window "*Checkdoc Status*"))
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  (message nil)
  (sit-for 0))
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;;;###autoload
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(defun checkdoc-interactive (&optional start-here showstatus)
  "Interactively check the current buffer for doc string errors.
Prefix argument START-HERE will start the checking from the current
point, otherwise the check starts at the beginning of the current
buffer.  Allows navigation forward and backwards through document
errors.  Does not check for comment or space warnings.
Optional argument SHOWSTATUS indicates that we should update the
checkdoc status window instead of the usual behavior."
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  (interactive "P")
  (let ((checkdoc-spellcheck-documentation-flag
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	 (car (memq checkdoc-spellcheck-documentation-flag
                    '(interactive t)))))
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    (prog1
        ;; Due to a design flaw, this will never spell check
        ;; docstrings.
        (checkdoc-interactive-loop start-here showstatus
                                   'checkdoc-next-error)
      ;; This is a workaround to perform spell checking.
      (checkdoc-interactive-ispell-loop start-here))))
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;;;###autoload
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(defun checkdoc-message-interactive (&optional start-here showstatus)
  "Interactively check the current buffer for message string errors.
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Prefix argument START-HERE will start the checking from the current
point, otherwise the check starts at the beginning of the current
buffer.  Allows navigation forward and backwards through document
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errors.  Does not check for comment or space warnings.
Optional argument SHOWSTATUS indicates that we should update the
checkdoc status window instead of the usual behavior."
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  (interactive "P")
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  (let ((checkdoc-spellcheck-documentation-flag
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	 (car (memq checkdoc-spellcheck-documentation-flag
                    '(interactive t)))))
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    (prog1
        ;; Due to a design flaw, this will never spell check messages.
        (checkdoc-interactive-loop start-here showstatus
                                   'checkdoc-next-message-error)
      ;; This is a workaround to perform spell checking.
      (checkdoc-message-interactive-ispell-loop start-here))))
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(defun checkdoc-interactive-loop (start-here showstatus findfunc)
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  "Interactively loop over all errors that can be found by a given method.
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If START-HERE is nil, searching starts at the beginning of the current
buffer, otherwise searching starts at START-HERE.  SHOWSTATUS
expresses the verbosity of the search, and whether ending the search
will auto-exit this function.

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FINDFUNC is a symbol representing a function that will position the
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cursor, and return error message text to present to the user.  It is
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assumed that the cursor will stop just before a major sexp, which will
be highlighted to present the user with feedback as to the offending
style."
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  ;; Determine where to start the test
  (let* ((begin (prog1 (point)
		  (if (not start-here) (goto-char (point-min)))))
	 ;; Assign a flag to spellcheck flag
	 (checkdoc-spellcheck-documentation-flag
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	  (car (memq checkdoc-spellcheck-documentation-flag
                     '(buffer interactive t))))
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	 ;; Fetch the error list
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	 (err-list (list (funcall findfunc nil)))
	 (cdo nil)
	 (returnme nil)
	 c)
    (save-window-excursion
      (if (not (car err-list)) (setq err-list nil))
      ;; Include whatever function point is in for good measure.
      (beginning-of-defun)
      (while err-list
	(goto-char (cdr (car err-list)))
	;; The cursor should be just in front of the offending doc string
	(if (stringp (car (car err-list)))
	    (setq cdo (save-excursion (checkdoc-make-overlay
				       (point) (progn (forward-sexp 1)
						      (point)))))
	  (setq cdo (checkdoc-make-overlay
		     (checkdoc-error-start (car (car err-list)))
		     (checkdoc-error-end (car (car err-list))))))
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	(unwind-protect
	    (progn
	      (checkdoc-overlay-put cdo 'face 'highlight)
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	      ;; Make sure the whole doc string is visible if possible.
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	      (sit-for 0)
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	      (if (and (looking-at "\"")
		       (not (pos-visible-in-window-p
			     (save-excursion (forward-sexp 1) (point))
			     (selected-window))))
		  (let ((l (count-lines (point)
					(save-excursion
					  (forward-sexp 1) (point)))))
		    (if (> l (window-height))
			(recenter 1)
		      (recenter (/ (- (window-height) l) 2))))
		(recenter))
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	      (message "%s (C-h,%se,n,p,q)" (checkdoc-error-text
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                                             (car (car err-list)))
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		       (if (checkdoc-error-unfixable (car (car err-list)))
			   "" "f,"))
	      (save-excursion
		(goto-char (checkdoc-error-start (car (car err-list))))
		(if (not (pos-visible-in-window-p))
		    (recenter (- (window-height) 2)))
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		(setq c (read-event)))
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	      (if (not (integerp c)) (setq c ??))
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	      (cond
	       ;; Exit condition
	       ((checkdoc-char= c ?\C-g) (signal 'quit nil))
	       ;; Request an auto-fix
	       ((or (checkdoc-char= c ?y) (checkdoc-char= c ?f))
		(checkdoc-delete-overlay cdo)
		(setq cdo nil)
		(goto-char (cdr (car err-list)))
		;; `automatic-then-never' tells the autofix function
		;; to only allow one fix to be automatic.  The autofix
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		;; function will then set the flag to 'never, allowing
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		;; the checker to return a different error.
		(let ((checkdoc-autofix-flag 'automatic-then-never)
		      (fixed nil))
		  (funcall findfunc t)
		  (setq fixed (not (eq checkdoc-autofix-flag
				       'automatic-then-never)))
		  (if (not fixed)
		      (progn
			(message "A Fix was not available.")
			(sit-for 2))
		    (setq err-list (cdr err-list))))
		(beginning-of-defun)
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		(let ((ne (funcall findfunc nil)))
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		  (if ne
		      (setq err-list (cons ne err-list))
		    (cond ((not err-list)
			   (message "No More Stylistic Errors.")
			   (sit-for 2))
			  (t
			   (message
			    "No Additional style errors.  Continuing...")
			   (sit-for 2))))))
	       ;; Move to the next error (if available)
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	       ((or (checkdoc-char= c ?n) (checkdoc-char= c ?\s))
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		(let ((ne (funcall findfunc nil)))
		  (if (not ne)
		      (if showstatus
			  (setq returnme err-list
				err-list nil)
			(if (not err-list)
			    (message "No More Stylistic Errors.")
			  (message "No Additional style errors.  Continuing..."))
			(sit-for 2))
		    (setq err-list (cons ne err-list)))))
	       ;; Go backwards in the list of errors
	       ((or (checkdoc-char= c ?p) (checkdoc-char= c ?\C-?))
		(if (/= (length err-list) 1)
		    (progn
		      (setq err-list (cdr err-list))
		      (goto-char (cdr (car err-list)))
		      (beginning-of-defun))
		  (message "No Previous Errors.")
		  (sit-for 2)))
	       ;; Edit the buffer recursively.
	       ((checkdoc-char= c ?e)
		(checkdoc-recursive-edit
		 (checkdoc-error-text (car (car err-list))))
		(checkdoc-delete-overlay cdo)
		(setq err-list (cdr err-list)) ;back up the error found.
		(beginning-of-defun)
		(let ((ne (funcall findfunc nil)))
		  (if (not ne)
		      (if showstatus
			  (setq returnme err-list
				err-list nil)
			(message "No More Stylistic Errors.")
			(sit-for 2))
		    (setq err-list (cons ne err-list)))))
	       ;; Quit checkdoc
	       ((checkdoc-char= c ?q)
		(setq returnme err-list
		      err-list nil
		      begin (point)))
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	       ;; Goofy stuff
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	       (t
		(if (get-buffer-window "*Checkdoc Help*")
		    (progn
		      (delete-window (get-buffer-window "*Checkdoc Help*"))
		      (kill-buffer "*Checkdoc Help*"))
		  (with-output-to-temp-buffer "*Checkdoc Help*"
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                    (with-current-buffer standard-output
                      (insert
                       "Checkdoc Keyboard Summary:\n"
                       (if (checkdoc-error-unfixable (car (car err-list)))
                           ""
                         (concat
                          "f, y    - auto Fix this warning without asking (if\
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 available.)\n"
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                          "         Very complex operations will still query.\n")
                         )
                       "e      - Enter recursive Edit.  Press C-M-c to exit.\n"
                       "SPC, n - skip to the Next error.\n"
                       "DEL, p - skip to the Previous error.\n"
                       "q      - Quit checkdoc.\n"
                       "C-h    - Toggle this help buffer.")))
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		  (shrink-window-if-larger-than-buffer
		   (get-buffer-window "*Checkdoc Help*"))))))
	  (if cdo (checkdoc-delete-overlay cdo)))))
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    (goto-char begin)
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    (if (get-buffer "*Checkdoc Help*") (kill-buffer "*Checkdoc Help*"))
    (message "Checkdoc: Done.")
    returnme))
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(defun checkdoc-interactive-ispell-loop (start-here)
  "Interactively spell check doc strings in the current buffer.
If START-HERE is nil, searching starts at the beginning of the current
buffer, otherwise searching starts at START-HERE."
  (when checkdoc-spellcheck-documentation-flag
    (save-excursion
      ;; Move point to where we need to start.
      (if start-here
          ;; Include whatever function point is in for good measure.
          (beginning-of-defun)
        (goto-char (point-min)))
      ;; Loop over docstrings.
      (while (checkdoc-next-docstring)
        (message "Searching for doc string spell error...%d%%"
                 (/ (* 100 (point)) (point-max)))
        (if (looking-at "\"")
            (checkdoc-ispell-docstring-engine
             (save-excursion (forward-sexp 1) (point-marker)))))
      (message "Checkdoc: Done."))))

(defun checkdoc-message-interactive-ispell-loop (start-here)
  "Interactively spell check messages in the current buffer.
If START-HERE is nil, searching starts at the beginning of the current
buffer, otherwise searching starts at START-HERE."
  (when checkdoc-spellcheck-documentation-flag
    (save-excursion
      ;; Move point to where we need to start.
      (if start-here
          ;; Include whatever function point is in for good measure.
          (beginning-of-defun)
        (goto-char (point-min)))
      ;; Loop over message strings.
      (while (checkdoc-message-text-next-string (point-max))
        (message "Searching for message string spell error...%d%%"
                 (/ (* 100 (point)) (point-max)))
        (if (looking-at "\"")
            (checkdoc-ispell-docstring-engine
             (save-excursion (forward-sexp 1) (point-marker)))))
      (message "Checkdoc: Done."))))


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(defun checkdoc-next-error (enable-fix)
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  "Find and return the next checkdoc error list, or nil.
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Only documentation strings are checked.
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An error list is of the form (WARNING . POSITION) where WARNING is the
warning text, and POSITION is the point in the buffer where the error
was found.  We can use points and not markers because we promise not
to edit the buffer before point without re-executing this check.
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Argument ENABLE-FIX will enable auto-fixing while looking for the next
error.  This argument assumes that the cursor is already positioned to
perform the fix."
  (if enable-fix
      (checkdoc-this-string-valid)
    (let ((msg nil) (p (point))
	  (checkdoc-autofix-flag nil))
      (condition-case nil
	  (while (and (not msg) (checkdoc-next-docstring))
	    (message "Searching for doc string error...%d%%"
		     (/ (* 100 (point)) (point-max)))
	    (if (setq msg (checkdoc-this-string-valid))
		(setq msg (cons msg (point)))))
	;; Quit.. restore position,  Other errors, leave alone
	(quit (goto-char p)))
      msg)))

(defun checkdoc-next-message-error (enable-fix)
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  "Find and return the next checkdoc message related error list, or nil.
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Only text for error and `y-or-n-p' strings are checked.  See
`checkdoc-next-error' for details on the return value.
Argument ENABLE-FIX turns on the auto-fix feature.  This argument
assumes that the cursor is already positioned to perform the fix."
  (if enable-fix
      (checkdoc-message-text-engine)
    (let ((msg nil) (p (point)) (type nil)
	  (checkdoc-autofix-flag nil))
      (condition-case nil
	  (while (and (not msg)
		      (setq type
			    (checkdoc-message-text-next-string (point-max))))
	    (message "Searching for message string error...%d%%"
		     (/ (* 100 (point)) (point-max)))
	    (if (setq msg (checkdoc-message-text-engine type))
		(setq msg (cons msg (point)))))
	;; Quit.. restore position,  Other errors, leave alone
	(quit (goto-char p)))
      msg)))

(defun checkdoc-recursive-edit (msg)
  "Enter recursive edit to permit a user to fix some error checkdoc has found.
MSG is the error that was found, which is displayed in a help buffer."
  (with-output-to-temp-buffer "*Checkdoc Help*"
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    (mapc #'princ
          (list "Error message:\n  " msg
                "\n\nEdit to fix this problem, and press C-M-c to continue.")))
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  (shrink-window-if-larger-than-buffer
   (get-buffer-window "*Checkdoc Help*"))
  (message "When you're done editing press C-M-c to continue.")
  (unwind-protect
      (recursive-edit)
    (if (get-buffer-window "*Checkdoc Help*")
	(progn
	  (delete-window (get-buffer-window "*Checkdoc Help*"))
	  (kill-buffer "*Checkdoc Help*")))))

;;;###autoload
(defun checkdoc-eval-current-buffer ()
  "Evaluate and check documentation for the current buffer.
Evaluation is done first because good documentation for something that
doesn't work is just not useful.  Comments, doc strings, and rogue
spacing are all verified."
  (interactive)
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  (eval-buffer nil)
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  (checkdoc-current-buffer t))
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;;;###autoload
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(defun checkdoc-current-buffer (&optional take-notes)
  "Check current buffer for document, comment, error style, and rogue spaces.
With a prefix argument (in Lisp, the argument TAKE-NOTES),
store all errors found in a warnings buffer,
otherwise stop after the first error."
  (interactive "P")
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  (if (called-interactively-p 'interactive)
      (message "Checking buffer for style..."))
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  ;; Assign a flag to spellcheck flag
  (let ((checkdoc-spellcheck-documentation-flag
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	 (car (memq checkdoc-spellcheck-documentation-flag
                    '(buffer t))))
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	(checkdoc-autofix-flag (if take-notes 'never
				 checkdoc-autofix-flag))
	(checkdoc-generate-compile-warnings-flag
	 (or take-notes checkdoc-generate-compile-warnings-flag)))
    (if take-notes
	(checkdoc-start-section "checkdoc-current-buffer"))
    ;; every test is responsible for returning the cursor.
    (or (and buffer-file-name ;; only check comments in a file
	     (checkdoc-comments))
	(checkdoc-start)
	(checkdoc-message-text)
	(checkdoc-rogue-spaces)
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	(not (called-interactively-p 'interactive))
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	(if take-notes (checkdoc-show-diagnostics))
	(message "Checking buffer for style...Done."))))

;;;###autoload
(defun checkdoc-start (&optional take-notes)
  "Start scanning the current buffer for documentation string style errors.
Only documentation strings are checked.
Use `checkdoc-continue' to continue checking if an error cannot be fixed.
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Prefix argument TAKE-NOTES means to collect all the warning messages into
a separate buffer."
  (interactive "P")
  (let ((p (point)))
    (goto-char (point-min))
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    (if (and take-notes (called-interactively-p 'interactive))
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	(checkdoc-start-section "checkdoc-start"))
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    (checkdoc-continue take-notes)
    ;; Go back since we can't be here without success above.
    (goto-char p)
    nil))

;;;###autoload
(defun checkdoc-continue (&optional take-notes)
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  "Find the next doc string in the current buffer which has a style error.
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Prefix argument TAKE-NOTES means to continue through the whole buffer and
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save warnings in a separate buffer.  Second optional argument START-POINT
is the starting location.  If this is nil, `point-min' is used instead."
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  (interactive "P")
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  (let ((wrong nil) (msg nil)
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	;; Assign a flag to spellcheck flag
	(checkdoc-spellcheck-documentation-flag
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	 (car (memq checkdoc-spellcheck-documentation-flag
                    '(buffer t))))
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	(checkdoc-autofix-flag (if take-notes 'never
				 checkdoc-autofix-flag))
	(checkdoc-generate-compile-warnings-flag
	 (or take-notes checkdoc-generate-compile-warnings-flag)))
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    (save-excursion
      ;; If we are taking notes, encompass the whole buffer, otherwise
      ;; the user is navigating down through the buffer.
      (while (and (not wrong) (checkdoc-next-docstring))
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	;; OK, let's look at the doc string.
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	(setq msg (checkdoc-this-string-valid))
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	(if msg (setq wrong (point)))))
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    (if wrong
	(progn
	  (goto-char wrong)
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	  (if (not take-notes)
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	      (error "%s" (checkdoc-error-text msg)))))
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    (checkdoc-show-diagnostics)
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    (if (called-interactively-p 'interactive)
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	(message "No style warnings."))))
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(defun checkdoc-next-docstring ()
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  "Move to the next doc string after point, and return t.
Return nil if there are no more doc strings."
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  (if (not (re-search-forward checkdoc-defun-regexp nil t))
      nil
    ;; search drops us after the identifier.  The next sexp is either
    ;; the argument list or the value of the variable.  skip it.
    (forward-sexp 1)
    (skip-chars-forward " \n\t")
    t))

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;;;###autoload
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(defun checkdoc-comments (&optional take-notes)
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  "Find missing comment sections in the current Emacs Lisp file.
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Prefix argument TAKE-NOTES non-nil means to save warnings in a
separate buffer.  Otherwise print a message.  This returns the error
if there is one."
  (interactive "P")
  (if take-notes (checkdoc-start-section "checkdoc-comments"))
  (if (not buffer-file-name)
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      (error "Can only check comments for a file buffer"))
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  (let* ((checkdoc-spellcheck-documentation-flag
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	  (car (memq checkdoc-spellcheck-documentation-flag
                     '(buffer t))))
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	 (checkdoc-autofix-flag (if take-notes 'never checkdoc-autofix-flag))
	 (e (checkdoc-file-comments-engine))
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         (checkdoc-generate-compile-warnings-flag
          (or take-notes checkdoc-generate-compile-warnings-flag)))
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    (if e (error "%s" (checkdoc-error-text e)))
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    (checkdoc-show-diagnostics)
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    e))

;;;###autoload
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(defun checkdoc-rogue-spaces (&optional take-notes interact)
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  "Find extra spaces at the end of lines in the current file.
Prefix argument TAKE-NOTES non-nil means to save warnings in a
separate buffer.  Otherwise print a message.  This returns the error
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if there is one.
Optional argument INTERACT permits more interactive fixing."
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  (interactive "P")
  (if take-notes (checkdoc-start-section "checkdoc-rogue-spaces"))
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  (let* ((checkdoc-autofix-flag (if take-notes 'never checkdoc-autofix-flag))
	 (e (checkdoc-rogue-space-check-engine nil nil interact))
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         (checkdoc-generate-compile-warnings-flag
          (or take-notes checkdoc-generate-compile-warnings-flag)))
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    (if (not (called-interactively-p 'interactive))
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	e
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      (if e
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	  (message "%s" (checkdoc-error-text e))
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	(checkdoc-show-diagnostics)
	(message "Space Check: done.")))))
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;;;###autoload
(defun checkdoc-message-text (&optional take-notes)
  "Scan the buffer for occurrences of the error function, and verify text.
Optional argument TAKE-NOTES causes all errors to be logged."
  (interactive "P")
  (if take-notes (checkdoc-start-section "checkdoc-message-text"))
  (let* ((p (point)) e
	 (checkdoc-autofix-flag (if take-notes 'never checkdoc-autofix-flag))
	 (checkdoc-generate-compile-warnings-flag
	  (or take-notes checkdoc-generate-compile-warnings-flag)))
    (setq e (checkdoc-message-text-search))
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    (if (not (called-interactively-p 'interactive))
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	e
      (if e
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	  (error "%s" (checkdoc-error-text e))
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	(checkdoc-show-diagnostics)))
    (goto-char p))
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  (if (called-interactively-p 'interactive)
      (message "Checking interactive message text...done.")))
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;;;###autoload
(defun checkdoc-eval-defun ()
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  "Evaluate the current form with `eval-defun' and check its documentation.
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Evaluation is done first so the form will be read before the
documentation is checked.  If there is a documentation error, then the display
of what was evaluated will be overwritten by the diagnostic message."
  (interactive)
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  (call-interactively 'eval-defun)
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  (checkdoc-defun))

;;;###autoload
(defun checkdoc-defun (&optional no-error)
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  "Examine the doc string of the function or variable under point.
Call `error' if the doc string has problems.  If NO-ERROR is
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non-nil, then do not call error, but call `message' instead.
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If the doc string passes the test, then check the function for rogue white
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space at the end of each line."
  (interactive)
  (save-excursion
    (beginning-of-defun)
    (if (not (looking-at checkdoc-defun-regexp))
	;; I found this more annoying than useful.
	;;(if (not no-error)
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	;;    (message "Cannot check this sexp's doc string."))
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	nil
      ;; search drops us after the identifier.  The next sexp is either
      ;; the argument list or the value of the variable.  skip it.
      (goto-char (match-end 0))
      (forward-sexp 1)
      (skip-chars-forward " \n\t")
      (let* ((checkdoc-spellcheck-documentation-flag
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	      (car (memq checkdoc-spellcheck-documentation-flag
                         '(defun t))))
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	     (beg (save-excursion (beginning-of-defun) (point)))
	     (end (save-excursion (end-of-defun) (point)))
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	     (msg (checkdoc-this-string-valid)))
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	(if msg (if no-error
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		    (message "%s" (checkdoc-error-text msg))
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		  (error "%s" (checkdoc-error-text msg)))
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	  (setq msg (checkdoc-message-text-search beg end))
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	  (if msg (if no-error
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		      (message "%s" (checkdoc-error-text msg))
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		    (error "%s" (checkdoc-error-text msg)))
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	    (setq msg (checkdoc-rogue-space-check-engine beg end))
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	    (if msg (if no-error
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			(message "%s" (checkdoc-error-text msg))
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		      (error "%s" (checkdoc-error-text msg))))))
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	(if (called-interactively-p 'interactive)
	    (message "Checkdoc: done."))))))
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;;; Ispell interface for forcing a spell check
;;

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;;;###autoload
(defun checkdoc-ispell (&optional take-notes)
  "Check the style and spelling of everything interactively.
Calls `checkdoc' with spell-checking turned on.
Prefix argument TAKE-NOTES is the same as for `checkdoc'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively 'checkdoc nil current-prefix-arg)))

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;;;###autoload
(defun checkdoc-ispell-current-buffer (&optional take-notes)
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  "Check the style and spelling of the current buffer.
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Calls `checkdoc-current-buffer' with spell-checking turned on.
Prefix argument TAKE-NOTES is the same as for `checkdoc-current-buffer'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively 'checkdoc-current-buffer nil current-prefix-arg)))

;;;###autoload
(defun checkdoc-ispell-interactive (&optional take-notes)
  "Check the style and spelling of the current buffer interactively.
Calls `checkdoc-interactive' with spell-checking turned on.
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Prefix argument TAKE-NOTES is the same as for `checkdoc-interactive'"
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  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively 'checkdoc-interactive nil current-prefix-arg)))

;;;###autoload
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(defun checkdoc-ispell-message-interactive (&optional take-notes)
  "Check the style and spelling of message text interactively.
Calls `checkdoc-message-interactive' with spell-checking turned on.
Prefix argument TAKE-NOTES is the same as for `checkdoc-message-interactive'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively 'checkdoc-message-interactive nil current-prefix-arg)))

;;;###autoload
(defun checkdoc-ispell-message-text (&optional take-notes)
  "Check the style and spelling of message text interactively.
Calls `checkdoc-message-text' with spell-checking turned on.
Prefix argument TAKE-NOTES is the same as for `checkdoc-message-text'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively 'checkdoc-message-text nil current-prefix-arg)))

;;;###autoload
(defun checkdoc-ispell-start (&optional take-notes)
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  "Check the style and spelling of the current buffer.
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Calls `checkdoc-start' with spell-checking turned on.
Prefix argument TAKE-NOTES is the same as for `checkdoc-start'"
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  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
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    (call-interactively 'checkdoc-start nil current-prefix-arg)))
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;;;###autoload
(defun checkdoc-ispell-continue (&optional take-notes)
  "Check the style and spelling of the current buffer after point.
Calls `checkdoc-continue' with spell-checking turned on.
Prefix argument TAKE-NOTES is the same as for `checkdoc-continue'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively 'checkdoc-continue nil current-prefix-arg)))

;;;###autoload
(defun checkdoc-ispell-comments (&optional take-notes)
  "Check the style and spelling of the current buffer's comments.
Calls `checkdoc-comments' with spell-checking turned on.
Prefix argument TAKE-NOTES is the same as for `checkdoc-comments'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively 'checkdoc-comments nil current-prefix-arg)))

;;;###autoload
(defun checkdoc-ispell-defun (&optional take-notes)
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  "Check the style and spelling of the current defun with Ispell.
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Calls `checkdoc-defun' with spell-checking turned on.
Prefix argument TAKE-NOTES is the same as for `checkdoc-defun'"
  (interactive)
  (let ((checkdoc-spellcheck-documentation-flag t))
    (call-interactively 'checkdoc-defun nil current-prefix-arg)))

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;;; Error Management
;;
;; Errors returned from checkdoc functions can have various
;; features and behaviors, so we need some ways of specifying
;; them, and making them easier to use in the wacked-out interfaces
;; people are requesting
(defun checkdoc-create-error (text start end &optional unfixable)
  "Used to create the return error text returned from all engines.
TEXT is the descriptive text of the error.  START and END define the region
it is sensible to highlight when describing the problem.
Optional argument UNFIXABLE means that the error has no auto-fix available.

A list of the form (TEXT START END UNFIXABLE) is returned if we are not
generating a buffered list of errors."
  (if checkdoc-generate-compile-warnings-flag
      (progn (checkdoc-error start text)
	     nil)
    (list text start end unfixable)