tree 27700545731add0ba3bf27a680771ff282008e52
parent 8aaa1484dc108aa23dcf2d4a09371c0c9e280f6b
author Ian Cottrell <iancottrell@google.com> 1559346099 -0400
committer Ian Cottrell <iancottrell@google.com> 1559783374 +0000

internal/lsp: change file system to allow lazy reads

We split aquiring a "handle" from reading a files contents so that we can do the
former eagerly and the latter lazily.
We also "version" the handles so that the same file at different versions is a
different handle.

Change-Id: I06cc346d4b4c77d784aa454702c54689f2f177e0
Reviewed-on: https://go-review.googlesource.com/c/tools/+/179917
Reviewed-by: Rebecca Stambler <rstambler@golang.org>