Diagnostics

A server reports problems as it finds them — a syntax error, an unused variable, a type that doesn’t match — and Helix shows each one as a diagnostic: an underline on the offending text, a mark in the gutter, and a count of errors and warnings on the statusline. The stand-in here treats every TODO as a warning and every FIXME as an error.

Two motions walk through them, and a picker lists them:

• ]d and [d — the next and previous diagnostic
• Space-d — a picker of every diagnostic in the buffer
• Space-D — the same, across every buffer the server has open

Both motions select the diagnostic they land on, so the message is easy to read and d or c act on exactly the flagged text. The picker earns its place when a project has dozens of problems; for one file the motions are usually enough.

The buffer below has two problems. Jump to the first with ]d, reach the second through the picker, then come back with [d.