Use dedicated semantic highlight tag for parameters

closes #5106

3 files changed, 8 insertions, 4 deletions

diff --git a/crates/ra_ide/src/syntax_highlighting.rs b/crates/ra_ide/src/syntax_highlighting.rs
index 028b55902..5bb6f9642 100644
--- a/crates/ra_ide/src/syntax_highlighting.rs
+++ b/crates/ra_ide/src/syntax_highlighting.rs
@@ -630,9 +630,10 @@ fn highlight_name(db: &RootDatabase, def: Definition) -> Highlight {
         },
         Definition::SelfType(_) => HighlightTag::SelfType,
         Definition::TypeParam(_) => HighlightTag::TypeParam,
-        // FIXME: distinguish between locals and parameters
         Definition::Local(local) => {
-            let mut h = Highlight::new(HighlightTag::Local);
+            let tag =
+                if local.is_param(db) { HighlightTag::ValueParam } else { HighlightTag::Local };
+            let mut h = Highlight::new(tag);
             if local.is_mut(db) || local.ty(db).is_mutable_reference() {
                 h |= HighlightModifier::Mutable;
             }
diff --git a/crates/ra_ide/src/syntax_highlighting/html.rs b/crates/ra_ide/src/syntax_highlighting/html.rs
index 0c74f7370..0be55bca9 100644
--- a/crates/ra_ide/src/syntax_highlighting/html.rs
+++ b/crates/ra_ide/src/syntax_highlighting/html.rs
@@ -83,14 +83,15 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .bool_literal       { color: #BFE6EB; }
 .macro              { color: #94BFF3; }
 .module             { color: #AFD8AF; }
+.value_param        { color: #DCDCCC; }
 .variable           { color: #DCDCCC; }
 .format_specifier   { color: #CC696B; }
 .mutable            { text-decoration: underline; }
-.unresolved_reference { color: #FC5555; }
 .escape_sequence    { color: #94BFF3; }
-
 .keyword            { color: #F0DFAF; font-weight: bold; }
 .keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
+
+.unresolved_reference { color: #FC5555; text-decoration: wavy underline; }
 </style>
 ";
diff --git a/crates/ra_ide/src/syntax_highlighting/tags.rs b/crates/ra_ide/src/syntax_highlighting/tags.rs
index 13d9dd195..719c6ed3c 100644
--- a/crates/ra_ide/src/syntax_highlighting/tags.rs
+++ b/crates/ra_ide/src/syntax_highlighting/tags.rs
@@ -41,6 +41,7 @@ pub enum HighlightTag {
     TypeAlias,
     TypeParam,
     Union,
+    ValueParam,
     Local,
     UnresolvedReference,
     FormatSpecifier,
@@ -95,6 +96,7 @@ impl HighlightTag {
             HighlightTag::TypeAlias => "type_alias",
             HighlightTag::TypeParam => "type_param",
             HighlightTag::Union => "union",
+            HighlightTag::ValueParam => "value_param",
             HighlightTag::Local => "variable",
             HighlightTag::UnresolvedReference => "unresolved_reference",
         }