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    <h3>Highlight sexps</h3> <p>First of all, turn on the builtin paren match highlighting (<code>show-paren-mode</code>) if not already did so. It always gives you an idea what indentation level you are in.</p> <p>There are also some more sophisticated packages. For example, see <a href="https://stackoverflow.com/questions/898287/how-can-i-spot-subtle-lisp-syntax-mistakes/898514#898514">TJ's answer on <code>mic-paren</code></a>. Or though I didn't find it suitable for me, but there is <a href="http://amitp.blogspot.com/2007/05/emacs-highlighting-parentheses.html" rel="nofollow noreferrer">Schumacher's highlight-parentheses mode</a> that highlights every expression block with different colors. Even <a href="http://edward.oconnor.cx/elisp/hl-sexp.el" rel="nofollow noreferrer">Edward O'Connor has a mode</a> that highlights the current sexp.</p> <h3>Paredit</h3> <p>Use <a href="http://www.emacswiki.org/emacs/ParEdit" rel="nofollow noreferrer"><code>paredit-mode</code></a> which helps you writing sexps. You can easily navigate between sexps and re-structure the code. In addition, it ensures the parenthesis always balanced. When I first tried it, it was very annoying for me how Paredit constrains the way of coding, but since then I'm used to work with it, I'm a lot more productive and never get confused with opening and closing parenthesis.</p> <h3>Auto indenting</h3> <p>Use <a href="http://www.emacsblog.org/2008/12/05/emacs-starter-kit/" rel="nofollow noreferrer">Emacs Starter Kit</a>, which, by default, enables a lot of useful helpers for coding in Elisp like re-indent on newline.</p> <h3>ElDoc</h3> <p><code>emacs-lisp-mode</code> has several useful extensions. For instance, I always use <code>eldoc-mode</code> that displays currently typing function's argument list or variable's docstring in the echo area. It also helps you easily recognize if you are in the wrong block.</p> <h3>Edebug</h3> <p>I've just nearly forgotten to mention <a href="http://www.gnu.org/software/emacs/elisp/html_node/Using-Edebug.html" rel="nofollow noreferrer">Edebug</a> which—as a last chance—always helps you figuring out what's going on in your code.</p>
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    1. POHow can I spot subtle Lisp syntax mistakes?
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    1. COWow eldoc-mode is cool - save me a bunch of C-h v and C-h f when I'm reading someone else's code.
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