Powerful custom page search/filter/ordering interface

[ssddanbrown]

Since BookStack will be used for many different purposes I think the ways in which people want to find relevant pages will be different. I think it would be worthwhile building in a system to allow front-end users to search and filter pages in as many ways as possible.

I'm thinking of doing this by building a simple custom query syntax. An interface could be built which simply builds up this syntax and displays all the possible options for filtering and ordering.

[ssddanbrown]

Partially implemented with introduction of tag search interface ([tag=value] syntax). Still need to open up the other page database fields.

[davidPilkington]

Allowing users to set multiple values for tags would be great too, for instance [tag=val1;val2;val3]

This would allow multiple values to be set in the tag rathern than adding the same tag over again with a new value.