= Searching
++This is an internal draft
In 0.8, Betula will support searching with a special query language. This document explains its syntax.

== Unary operators
```
#
title:
protocol:
url:
site:
desc:
```

Rules (op is used instead of all the operators):
```
op A
op (A B)   -> op A op B
op (A | B) -> op A | op B
op (A - B) -> op A - op B
op1 op2 A  -> op1 A op2 A
op - A     -> - op A
op | A     -> (ignored)
op         -> (ignored)
```

== Binary operators
```
|
-
(implicit and)
```

Rules (every operator is replaced with o, they all have the same precedence):
```
A
A o B
A o B o C -> (A o B) o C
A o       -> (ignored)
o A       -> (ignored)
```

So, this query `dog | bird cat` is `(dog OR bird) AND cat`.