Miller columns in the Finder

[hojberg]

We want to support Miller Columns in the Finder as an alternative (and superior) way to browse a codebase when compared to the sidebar.

The intention is that without a search query, the Miller Columns view of the Finder is shown.

Here's a mock (scrolled to the left slightly to indicate the horizontal scroll):

Additionally we'd want the Finder to support focusing in on a namespace. Either by automatically scrolling to it in the miller columns or by only allowing browsing/querying within a namespace. Could have a bubble filter over the finder like so:

Checklist

• List (using /list API) a namespace
• Clicking a sub namespace should open a new column and list that namespace
• Clicking a definition should open a preview of that definition
• The preview should have a "Open" button
• Arrow keys should be allowed to navigate up and down a column with arrow left and right to open a sub namespace
• Enter on a definition should open it
• Enter on a namespace should open a column
• Should support horizontal scrolling
• Columns should be fixed size (resize support later)
• Typing any letters should issue a Finder query
• Clearing a query should show the previously browsed columns