This function returns the documentation string that is recorded in
symbol’s property list under property property. It
retrieves the text from a file if necessary, and runs
substitute-command-keys to substitute actual key bindings. (This
substitution is not done if verbatim is non-
verbatim argument exists only as of Emacs 19.)
(documentation-property 'command-line-processed 'variable-documentation) ⇒ "t once command line has been processed"
(symbol-plist 'command-line-processed) ⇒ (variable-documentation 188902)
This function returns the documentation string of function. It
reads the text from a file if necessary. Then (unless verbatim is
nil) it calls
substitute-command-keys, to return a
value containing the actual (current) key bindings.
documentation signals a
if function has no function definition. However, it is ok if
the function definition has no documentation string. In that case,
Here is an example of using the two functions,
documentation-property, to display the documentation strings for
several symbols in a ‘*Help*’ buffer.
(defun describe-symbols (pattern) "Describe the SXEmacs Lisp symbols matching PATTERN. All symbols that have PATTERN in their name are described in the `*Help*' buffer." (interactive "sDescribe symbols matching: ") (let ((describe-func (function (lambda (s)
;; Print description of symbol. (if (fboundp s) ; It is a function. (princ (format "%s\t%s\n%s\n\n" s (if (commandp s) (let ((keys (where-is-internal s))) (if keys (concat "Keys: " (mapconcat 'key-description keys " ")) "Keys: none")) "Function")
(or (documentation s) "not documented")))) (if (boundp s) ; It is a variable.
(princ (format "%s\t%s\n%s\n\n" s (if (user-variable-p s) "Option " "Variable")
(or (documentation-property s 'variable-documentation) "not documented"))))))) sym-list)
;; Build a list of symbols that match pattern. (mapatoms (function (lambda (sym) (if (string-match pattern (symbol-name sym)) (setq sym-list (cons sym sym-list))))))
;; Display the data. (with-output-to-temp-buffer "*Help*" (mapcar describe-func (sort sym-list 'string<)) (print-help-return-message))))
describe-symbols function works like
but provides more information.
(describe-symbols "goal") ---------- Buffer: *Help* ---------- goal-column Option *Semipermanent goal column for vertical motion, as set by C-x C-n, or nil.
set-goal-column Command: C-x C-n Set the current horizontal position as a goal for C-n and C-p.
Those commands will move to this position in the line moved to rather than trying to keep the same horizontal position. With a non-
nilargument, clears out the goal column so that C-n and C-p resume vertical motion. The goal column is stored in the variable `goal-column'.
temporary-goal-column Variable Current goal column for vertical motion. It is the column where point was at the start of current run of vertical motion commands. When the `track-eol' feature is doing its job, the value is 9999. ---------- Buffer: *Help* ----------
This function is used only during SXEmacs initialization, just before the runnable SXEmacs is dumped. It finds the file offsets of the documentation strings stored in the file filename, and records them in the in-core function definitions and variable property lists in place of the actual strings. See Building SXEmacs.
SXEmacs finds the file filename in the lib-src directory.
When the dumped SXEmacs is later executed, the same file is found in the
doc-directory. The usual value for filename is
DOC, but this can be changed by modifying the variable
This variable holds the name of the file containing documentation strings of built-in symbols, usually DOC. The full pathname of the internal doc file is ‘(concat doc-directory internal-doc-file-name)’.
This variable holds the name of the directory which contains the internal doc file that contains documentation strings for built-in and preloaded functions and variables.
In most cases, this is the same as
exec-directory. They may be
different when you run SXEmacs from the directory where you built it,
without actually installing it. See
exec-directory in Help Functions.
In older Emacs versions,
exec-directory was used for this.
This variable holds the name of the directory in which SXEmacs finds
certain system independent documentation and text files that come
with SXEmacs. In older Emacs versions,
exec-directory was used for