-File: xemacs.info, Node: Terminal Init, Prev: Init Examples, Up: Init File
-
-Terminal-Specific Initialization
---------------------------------
-
- Each terminal type can have a Lisp library to be loaded into Emacs
-when it is run on that type of terminal. For a terminal type named
-TERMTYPE, the library is called `term/TERMTYPE' and it is found by
-searching the directories `load-path' as usual and trying the suffixes
-`.elc' and `.el'. Normally it appears in the subdirectory `term' of
-the directory where most Emacs libraries are kept.
-
- The usual purpose of the terminal-specific library is to define the
-escape sequences used by the terminal's function keys using the library
-`keypad.el'. See the file `term/vt100.el' for an example of how this
-is done.
-
- When the terminal type contains a hyphen, only the part of the name
-before the first hyphen is significant in choosing the library name.
-Thus, terminal types `aaa-48' and `aaa-30-rv' both use the library
-`term/aaa'. The code in the library can use `(getenv "TERM")' to find
-the full terminal type name.
-
- The library's name is constructed by concatenating the value of the
-variable `term-file-prefix' and the terminal type. Your `.emacs' file
-can prevent the loading of the terminal-specific library by setting
-`term-file-prefix' to `nil'.
-
- The value of the variable `term-setup-hook', if not `nil', is called
-as a function of no arguments at the end of Emacs initialization, after
-both your `.emacs' file and any terminal-specific library have been
-read. You can set the value in the `.emacs' file to override part of
-any of the terminal-specific libraries and to define initializations
-for terminals that do not have a library.
+File: xemacs.info, Node: Changing an Option, Next: Face Customization, Prev: Customization Groups, Up: Easy Customization
+
+Changing an Option
+..................
+
+ Here is an example of what a user option looks like in the
+customization buffer:
+
+ Kill Ring Max: [Hide] 30
+ [State]: this option is unchanged from its standard setting.
+ Maximum length of kill ring before oldest elements are thrown away.
+
+ The text following `[Hide]', `30' in this case, indicates the
+current value of the option. If you see `[Show]' instead of `[Hide]',
+it means that the value is hidden; the customization buffer initially
+hides values that take up several lines. Invoke `[Show]' to show the
+value.
+
+ The line after the option name indicates the "customization state"
+of the option: in the example above, it says you have not changed the
+option yet. The word `[State]' at the beginning of this line is
+active; you can get a menu of various operations by invoking it with
+`Mouse-1' or <RET>. These operations are essential for customizing the
+variable.
+
+ The line after the `[State]' line displays the beginning of the
+option's documentation string. If there are more lines of
+documentation, this line ends with `[More]'; invoke this to show the
+full documentation string.
+
+ To enter a new value for `Kill Ring Max', move point to the value
+and edit it textually. For example, you can type `M-d', then insert
+another number.
+
+ When you begin to alter the text, you will see the `[State]' line
+change to say that you have edited the value:
+
+ [State]: you have edited the value as text, but not set the option.
+
+ Editing the value does not actually set the option variable. To do
+that, you must "set" the option. To do this, invoke the word `[State]'
+and choose `Set for Current Session'.
+
+ The state of the option changes visibly when you set it:
+
+ [State]: you have set this option, but not saved it for future sessions.
+
+ You don't have to worry about specifying a value that is not valid;
+setting the option checks for validity and will not really install an
+unacceptable value.
+
+ While editing a value or field that is a file name, directory name,
+command name, or anything else for which completion is defined, you can
+type `M-<TAB>' (`widget-complete') to do completion.
+
+ Some options have a small fixed set of possible legitimate values.
+These options don't let you edit the value textually. Instead, an
+active field `[Value Menu]' appears before the value; invoke this field
+to edit the value. For a boolean "on or off" value, the active field
+says `[Toggle]', and it changes to the other value. `[Value Menu]' and
+`[Toggle]' edit the buffer; the changes take effect when you use the
+`Set for Current Session' operation.
+
+ Some options have values with complex structure. For example, the
+value of `load-path' is a list of directories. Here is how it appears
+in the customization buffer:
+
+ Load Path:
+ [INS] [DEL] [Current dir?]: /usr/local/share/emacs/19.34.94/site-lisp
+ [INS] [DEL] [Current dir?]: /usr/local/share/emacs/site-lisp
+ [INS] [DEL] [Current dir?]: /usr/local/share/emacs/19.34.94/leim
+ [INS] [DEL] [Current dir?]: /usr/local/share/emacs/19.34.94/lisp
+ [INS] [DEL] [Current dir?]: /build/emacs/e19/lisp
+ [INS] [DEL] [Current dir?]: /build/emacs/e19/lisp/gnus
+ [INS]
+ [State]: this item has been changed outside the customization buffer.
+ List of directories to search for files to load....
+
+Each directory in the list appears on a separate line, and each line has
+several editable or active fields.
+
+ You can edit any of the directory names. To delete a directory from
+the list, invoke `[DEL]' on that line. To insert a new directory in
+the list, invoke `[INS]' at the point where you want to insert it.
+
+ You can also invoke `[Current dir?]' to switch between including a
+specific named directory in the path, and including `nil' in the path.
+(`nil' in a search path means "try the current directory.")
+
+ Two special commands, <TAB> and `S-<TAB>', are useful for moving
+through the customization buffer. <TAB> (`widget-forward') moves
+forward to the next active or editable field; `S-<TAB>'
+(`widget-backward') moves backward to the previous active or editable
+field.
+
+ Typing <RET> on an editable field also moves forward, just like
+<TAB>. The reason for this is that people have a tendency to type
+<RET> when they are finished editing a field. If you have occasion to
+insert a newline in an editable field, use `C-o' or `C-q C-j',
+
+ Setting the option changes its value in the current Emacs session;
+"saving" the value changes it for future sessions as well. This works
+by writing code into your init file so as to set the option variable
+again each time you start Emacs. *Note Init File::. To save the
+option, invoke `[State]' and select the `Save for Future Sessions'
+operation.
+
+ You can also restore the option to its standard value by invoking
+`[State]' and selecting the `Reset' operation. There are actually
+three reset operations:
+
+`Reset to Current'
+ If you have made some modifications and not yet set the option,
+ this restores the text in the customization buffer to match the
+ actual value.
+
+`Reset to Saved'
+ This restores the value of the option to the last saved value, and
+ updates the text accordingly.
+
+`Reset to Standard Settings'
+ This sets the option to its standard value, and updates the text
+ accordingly. This also eliminates any saved value for the option,
+ so that you will get the standard value in future Emacs sessions.
+
+ The state of a group indicates whether anything in that group has
+been edited, set or saved. You can select `Set for Current Session',
+`Save for Future Sessions' and the various kinds of `Reset' operation
+for the group; these operations on the group apply to all options in
+the group and its subgroups.
+
+ Near the top of the customization buffer there are two lines
+containing several active fields:
+
+ [Set] [Save] [Reset] [Done]
+
+Invoking `[Done]' buries this customization buffer. Each of the other
+fields performs an operation--set, save or reset--on each of the items
+in the buffer that could meaningfully be set, saved or reset.