hls-pragmas-plugin: Simply completion and add comments

plugins/hls-pragmas-plugin/src/Ide/Plugin/Pragmas.hs

@@ -195,15 +195,24 @@ completion _ide _ complParams = do
                     = [ mkPragmaCompl (a <> suffix) b c
                       | (a, b, c, w) <- validPragmas, w == NewLine
                       ]
-                    | "import" `T.isPrefixOf` line || not (T.null module_) || T.null word
+                    | -- Do not suggest any pragmas any of these conditions:
+                      -- 1. Current line is a an import
+                      -- 2. There is a module name right before the current word.
+                      --    Something like `Text.la` shouldn't suggest adding the
+                      --    'LANGUAGE' pragma.
+                      -- 3. The user has not typed anything yet.
+                      "import" `T.isPrefixOf` line || not (T.null module_) || T.null word
                     = []
                     | otherwise
                     = [ mkPragmaCompl (prefix <> pragmaTemplate <> suffix) matcher detail
                       | (pragmaTemplate, matcher, detail, appearWhere) <- validPragmas
-                      , Fuzzy.test word matcher
-                      , (appearWhere == NewLine && line == word)
-                        || (appearWhere == CanInline && line /= word)
-                        || (T.elem ' ' matcher && appearWhere == NewLine && Fuzzy.test line matcher)
+                      , -- Only suggest a pragma that need its own line if the whole line
+                        -- fuzzily matches the pragma
+                        (appearWhere == NewLine && Fuzzy.test line matcher ) ||
+                        -- Only suggest a pragma that appears in the middle of a line when
+                        -- the current word is not the only thing in the line and the
+                        -- current word fuzzily matches the pragma
+                        (appearWhere == CanInline && line /= word && Fuzzy.test word matcher)
                       ]
                     where
                         line = T.toLower $ VFS.fullLine pfix