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Init File Examples
Here are some examples of doing certain commonly desired things with
* Make TAB in C mode just insert a tab if point is in the middle of a
(setq c-tab-always-indent nil)
Here we have a variable whose value is normally `t' for `true' and
the alternative is `nil' for `false'.
* Make searches case sensitive by default (in all buffers that do not
(setq-default case-fold-search nil)
This sets the default value, which is effective in all buffers
that do not have local values for the variable. Setting
`case-fold-search' with `setq' affects only the current buffer's
local value, which is not what you probably want to do in an init
* Make Text mode the default mode for new buffers.
(setq default-major-mode 'text-mode)
Note that `text-mode' is used because it is the command for
entering Text mode. The single-quote before it makes the symbol a
constant; otherwise, `text-mode' would be treated as a variable
* Turn on Auto Fill mode automatically in Text mode and related
'(lambda () (auto-fill-mode 1)))
This shows how to add a hook function to a normal hook variable
(Note: Hooks.). The function we supply is a list starting with
`lambda', with a single-quote in front of it to make it a list
constant rather than an expression.
It's beyond the scope of this manual to explain Lisp functions,
but for this example it is enough to know that the effect is to
execute `(auto-fill-mode 1)' when Text mode is entered. You can
replace it with any other expression that you like, or with
several expressions in a row.
Emacs comes with a function named `turn-on-auto-fill' whose
definition is `(lambda () (auto-fill-mode 1))'. Thus, a simpler
way to write the above example is as follows:
(add-hook 'text-mode-hook 'turn-on-auto-fill)
* Load the installed Lisp library named `foo' (actually a file
`foo.elc' or `foo.el' in a standard Emacs directory).
When the argument to `load' is a relative file name, not starting
with `/' or `~', `load' searches the directories in `load-path'
(Note: Lisp Libraries.).
* Load the compiled Lisp file `foo.elc' from your home directory.
Here an absolute file name is used, so no searching is done.
* Rebind the key `C-x l' to run the function `make-symbolic-link'.
(global-set-key "\C-xl" 'make-symbolic-link)
(define-key global-map "\C-xl" 'make-symbolic-link)
Note once again the single-quote used to refer to the symbol
`make-symbolic-link' instead of its value as a variable.
* Do the same thing for C mode only.
(define-key c-mode-map "\C-xl" 'make-symbolic-link)
* Redefine all keys which now run `next-line' in Fundamental mode so
that they run `forward-line' instead.
(substitute-key-definition 'next-line 'forward-line
* Make `C-x C-v' undefined.
One reason to undefine a key is so that you can make it a prefix.
Simply defining `C-x C-v ANYTHING' will make `C-x C-v' a prefix,
but `C-x C-v' must first be freed of its usual non-prefix
* Make `$' have the syntax of punctuation in Text mode. Note the
use of a character constant for `$'.
(modify-syntax-entry ?\$ "." text-mode-syntax-table)
* Enable the use of the command `eval-expression' without
(put 'eval-expression 'disabled nil)
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