[SAOC 2025] Improve error messages and LSP integration Weekly Update #8

[Iskaban10]

## [SAOC 2025] Improve error messages and LSP integration Weekly 
Update #8

### Work Done

This week, my focus was on exploring and beginning the 
integration of DMD’s new -verror-style=lsp flag into the serve-d 
language server to enable compiler-grade semantic diagnostics 
directly inside editors that use the Language Server Protocol 
(LSP).

Serve-d currently provides syntax-level diagnostics using 
libdparse, DCD, and Dscanner, but not full semantic errors. My 
goal is to allow serve-d to invoke DMD with -verror-style=lsp 
after a file save event and forward its JSON-formatted 
diagnostics to the editor via LSP.

I focused on:

- Studying serve-d’s internal architecture, focusing on how it 
handles LSP requests and file save events (textDocument/didSave).

- Tracing the diagnostics flow inside serve-d — particularly how 
it currently collects and publishes diagnostic messages to the 
client.

- Understanding how DMD emits diagnostics with the new 
-verror-style=lsp flag, and testing it manually from the command 
line to verify output format and coverage of semantic errors.

**My future plans are**:

- Hooking into didSave event in server.d to trigger a new 
function runSemanticDiagnostics(uri).

- Implementing runSemanticDiagnostics() to spawn DMD with 
-verror-style=lsp and collect JSON output.

- Parsing DMD’s output and publishing it to the client via 
textDocument/publishDiagnostics.