The vhdl-offsets-alist variable is where you customize all your
indentations. You simply need to decide what additional offset you want
to add for every syntactic symbol. You can use the command C-c
O (vhdl-set-offset) as the way to set offsets, both
interactively and from your mode hook. Also, you can set up
styles of indentation. Most likely, you’ll find one of the
pre-defined styles will suit your needs, but if not, this section will
describe how to set up basic editing configurations. See Styles, for
an explanation of how to set up named styles.
As mentioned previously, the variable vhdl-offsets-alist is an
association list between syntactic symbols and the offsets to be applied
for those symbols. In fact, these offset values can be an integer, a
function or variable name, or one of the following symbols: +,
-, ++, --, *, or /. The symbol
values have the following meanings:
+ – 1 x vhdl-basic-offset
- – -1 x vhdl-basic-offset
++ – 2 x vhdl-basic-offset
-- – -2 x vhdl-basic-offset
* – 0.5 x vhdl-basic-offset
/ – -0.5 x vhdl-basic-offset
So, for example, because most of the default offsets are defined in
terms of +, -, and 0, if you like the general
indentation style, but you use 2 spaces instead of 4 spaces per level,
you can probably achieve your style just by changing
vhdl-basic-offset like so (in your .emacs file):
(setq vhdl-basic-offset 2)
To change indentation styles more radically, you will want to change the
value associated with the syntactic symbols in the
vhdl-offsets-alist variable. First, I’ll show you how to do that
interactively, then I’ll describe how to make changes to your
.emacs file so that your changes are more permanent.