## 13 Doc

Function: APROPOS (string &optional (package nil))

  Package:LISP

  Prints those symbols whose print-names contain STRING as substring. If PACKAGE is non-NIL, then only the specified package is searched.

Function: INFO (string &optional (list-of-info-files *default-info-files*))

  PACKAGE:SI

  Find all documentation about STRING in LIST-OF-INFO-FILES. The search is done for STRING as a substring of a node name, or for STRING in the indexed entries in the first index for each info file. Typically that should be a variable and function definition index, if the info file is about a programming language. If the windowing system is connected, then a choice box is offered and double clicking on an item brings up its documentation.

  Otherwise a list of choices is offered and the user may select some of these choices.

  list-of-info-files is of the form

       ("gcl-si.info" "gcl-tk.info" "gcl.info")

  The above list is the default value of *default-info-files*, a variable in the SI package. To find these files in the file system, the search path *info-paths* is consulted as is the master info directory `dir`.

  see *Index *default-info-files*:: and *Index *info-paths*::. For example

      (info "defun")

       0: DEFUN :(gcl-si.info)Special Forms and Functions.
       1: (gcl.info)defun.
      Enter n, all, none, or multiple choices eg 1 3 : 1

      Info from file /home/wfs/gcl-doc/gcl.info:
      defun                                                               [Macro]
      ---------------------------------------------------------------------------
      `Defun'  function-name lambda-list [[{declaration}* | documentation]]
      ...

  would list the node `(gcl.info)defun`. That is the node entitled `defun` from the info file gcl.info. That documentation is based on the ANSI common lisp standard. The choice

      DEFUN :(gcl-si.info)Special Forms and Functions.

  refers to the documentation on DEFUN from the info file gcl-si.info in the node Special Forms And Functions. This is an index reference and only the part of the node which refers to `defun` will be printed.

      (info "factor" '("maxima.info"))

  would search the maxima info files index and nodes for `factor`.

Variable: *info-paths*

  Package SI:

  A list of strings such as

        '("" "/usr/info/" "/usr/local/lib/info/" "/usr/local/info/"
          "/usr/local/gnu/info/" )

  saying where to look for the info files. It is used implicitly by `info`, see *Index info::.

  Looking for maxima.info would look for the file maxima.info in all the directories listed in *info-paths*. If nto found then it would look for `dir` in the *info-paths* directories, and if it were found it would look in the `dir` for a menu item such as

      * maxima: (/home/wfs/maxima-5.0/info/maxima.info).

  If such an entry exists then the directory there would be used for the purpose of finding `maxima.info`