Support non-indented where clauses

src/config.rs

@@ -91,6 +91,7 @@ create_config! {
     fn_args_paren_newline: bool,
     fn_args_layout: Density,
     fn_arg_indent: BlockIndentStyle,
+    where_indent: BlockIndentStyle, // Visual will be treated like Tabbed
     generics_indent: BlockIndentStyle,
     struct_trailing_comma: SeparatorTactic,
     struct_lit_trailing_comma: SeparatorTactic,
@@ -118,6 +119,7 @@ impl Default for Config {
             fn_args_paren_newline: true,
             fn_args_layout: Density::Tall,
             fn_arg_indent: BlockIndentStyle::Visual,
+            where_indent: BlockIndentStyle::Tabbed,
             generics_indent: BlockIndentStyle::Visual,
             struct_trailing_comma: SeparatorTactic::Vertical,
             struct_lit_trailing_comma: SeparatorTactic::Vertical,

src/items.rs

@@ -800,9 +800,14 @@ impl<'a> FmtVisitor<'a> {
             return String::new();
         }
 
+        let extra_indent = match self.config.where_indent {
+            BlockIndentStyle::Inherit => 0,
+            BlockIndentStyle::Tabbed | BlockIndentStyle::Visual => config.tab_spaces,
+        };
+
         let context = self.get_context();
         // 6 = "where ".len()
-        let offset = indent + config.tab_spaces + 6;
+        let offset = indent + extra_indent + 6;
         let budget = self.config.ideal_width + self.config.leeway - offset;
         let span_start = span_for_where_pred(&where_clause.predicates[0]).lo;
         let items = itemize_list(self.codemap,
@@ -828,7 +833,7 @@ impl<'a> FmtVisitor<'a> {
         };
 
         format!("\n{}where {}",
-                make_indent(indent + config.tab_spaces),
+                make_indent(indent + extra_indent),
                 write_list(&items.collect::<Vec<_>>(), &fmt))
     }
 

tests/config/small_tabs.toml

@@ -8,6 +8,7 @@ fn_return_indent = "WithArgs"
 fn_args_paren_newline = true
 fn_args_layout = "Tall"
 fn_arg_indent = "Visual"
+where_indent = "Tabbed"
 generics_indent = "Visual"
 struct_trailing_comma = "Vertical"
 struct_lit_trailing_comma = "Vertical"

tests/source/fn-custom-2.rs

@@ -1,5 +1,6 @@
 // rustfmt-fn_arg_indent: Inherit
 // rustfmt-generics_indent: Tabbed
+// rustfmt-where_indent: Inherit
 // Test different indents.
 
 fn foo(a: Aaaaaaaaaaaaaaa, b: Bbbbbbbbbbbbbbbb, c: Ccccccccccccccccc, d: Ddddddddddddddddddddddddd, e: Eeeeeeeeeeeeeeeeeee) {
@@ -10,6 +11,10 @@ fn bar<'a: 'bbbbbbbbbbbbbbbbbbbbbbbbbbb, TTTTTTTTTTTTT, UUUUUUUUUUUUUUUUUUUU: WW
     bar();
 }
 
+fn baz() where X: TTTTTTTT {
+    baz();
+}
+
 impl Foo {
     fn foo(self, a: Aaaaaaaaaaaaaaa, b: Bbbbbbbbbbbbbbbb, c: Ccccccccccccccccc, d: Ddddddddddddddddddddddddd, e: Eeeeeeeeeeeeeeeeeee) {
         foo();
@@ -18,6 +23,10 @@ impl Foo {
     fn bar<'a: 'bbbbbbbbbbbbbbbbbbbbbbbbbbb, TTTTTTTTTTTTT, UUUUUUUUUUUUUUUUUUUU: WWWWWWWWWWWWWWWWWWWWWWWW>(a: Aaaaaaaaaaaaaaa) {
         bar();
     }
+
+    fn baz() where X: TTTTTTTT {
+        baz();
+    }
 }
 
 struct Foo<TTTTTTTTTTTTTTTTTTTTTTTTTTTT, UUUUUUUUUUUUUUUUUUUUUU, VVVVVVVVVVVVVVVVVVVVVVVVVVV, WWWWWWWWWWWWWWWWWWWWWWWW> {

tests/target/fn-custom-2.rs

@@ -1,5 +1,6 @@
 // rustfmt-fn_arg_indent: Inherit
 // rustfmt-generics_indent: Tabbed
+// rustfmt-where_indent: Inherit
 // Test different indents.
 
 fn foo(a: Aaaaaaaaaaaaaaa,
@@ -17,6 +18,12 @@ fn bar<'a: 'bbbbbbbbbbbbbbbbbbbbbbbbbbb,
     bar();
 }
 
+fn baz()
+where X: TTTTTTTT
+{
+    baz();
+}
+
 impl Foo {
     fn foo(self,
     a: Aaaaaaaaaaaaaaa,
@@ -33,6 +40,12 @@ impl Foo {
         (a: Aaaaaaaaaaaaaaa) {
         bar();
     }
+
+    fn baz()
+    where X: TTTTTTTT
+    {
+        baz();
+    }
 }
 
 struct Foo<TTTTTTTTTTTTTTTTTTTTTTTTTTTT,