Server can't find module if project not already built

[cgay]

Using my time library as a test, LSP in emacs works well when I

• dylan build -a
• start a fresh emacs
• C-x C-f time.dylan
• M-x lsp
• move around the file and use M-. or M-? on various things

If I instead change that first (build) step to rm -rf _build to make sure there are no build products, the subsequent steps fail with dylan-lsp-server crashing with:

No module found for /Users/cgay/dylan/workspaces/time/sources/time.dylan
Backtrace:
  invoke-debugger:internal:dylan##1 + 0x29
  default-handler:dylan:dylan##1 + 0x12
  default-last-handler:common-dylan-internals:common-dylan##0 + 0x2a6
  error:dylan:dylan##0 + 0x2a
  error:dylan:dylan##1 + 0x79
  ensure-document-module:lsp-dylan-impl:lsp-dylan##0 + 0x103
  handle-textdocument/hover:lsp-dylan-impl:lsp-dylan + 0x86
  invoke-message-handler:lsp-dylan-impl:lsp-dylan + 0x2cd
  lsp-active-state-loop:lsp-dylan-impl:lsp-dylan + 0x5b
  lsp-server-top-level:lsp-dylan:lsp-dylan + 0xdb
  main:dylan-lsp-server:dylan-lsp-server + 0x360

It requires my dev branch changes that use dylan-tool dev branch changes to choose a reasonable default project to open, to even get this far, at least on macOS. Logging it here in case I get side-tracked before getting it fixed.

[cgay]

In case it's not obvious, it seems fairly natural to get an error if there are no build products. The point is that we need to initiate a build and let the user know it may take some time for the initial build.

[cgay]

Reminder to self... we'll need to run dylan update in the workspace the first time a project is being opened. Or give an appropriate error with a suggestion that the user run it. Or prompt the user to "Run dylan update now?"