fix(fuzzy): check shared lib existence before skipping download (#2055)

* fix(fuzzy): check shared lib existence before skipping download

Avoid false positives when the version file exists but the shared
library is missing (e.g., due to incomplete build). Notify the user in
that case.

Closes #2048

* fix(fuzzy): test load via require, update error message

---------

Co-authored-by: Liam Dyer <[email protected]>

Author: soifou

lua/blink/cmp/fuzzy/download/init.lua

@@ -30,8 +30,22 @@ function download.ensure_downloaded(callback)
 
       -- built locally
       if version.current.sha ~= nil then
-        -- up to date or version ignored, ignore
-        if version.current.sha == version.git.sha or download_config.ignore_version_mismatch then return end
+        -- check version matches (or explicitly ignored) and shared library exists
+        if version.current.sha == version.git.sha or download_config.ignore_version_mismatch then
+          local loaded, err = pcall(require, 'blink.cmp.fuzzy.rust')
+          if loaded then return end
+
+          -- shared library missing despite matching version info (e.g., incomplete build)
+          utils.notify({
+            { 'Incomplete build of the ' },
+            { 'fuzzy matching library', 'DiagnosticInfo' },
+            { ' detected, please re-run ' },
+            { ' cargo build --release ', 'DiagnosticVirtualTextInfo' },
+            { ' such as by re-installing. ' },
+            { 'Error: ' .. tostring(err), 'DiagnosticError' },
+          })
+          return false
+        end
 
         -- out of date
         utils.notify({