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-rw-r--r--crates/ra_assists/src/assists/flip_trait_bound.rs32
-rw-r--r--crates/ra_assists/src/lib.rs2
2 files changed, 34 insertions, 0 deletions
diff --git a/crates/ra_assists/src/assists/flip_trait_bound.rs b/crates/ra_assists/src/assists/flip_trait_bound.rs
new file mode 100644
index 000000000..a2c954ec5
--- /dev/null
+++ b/crates/ra_assists/src/assists/flip_trait_bound.rs
@@ -0,0 +1,32 @@
1//! Assist for swapping traits inside of a trait bound list
2//!
3//! E.g. `A + B` => `B + A` when the cursor is placed by the `+` inside of a
4//! trait bound list
5
6use hir::db::HirDatabase;
7use ra_syntax::{algo::non_trivia_sibling, ast::TypeBoundList, Direction, T};
8
9use crate::{Assist, AssistCtx, AssistId};
10
11/// Flip trait bound assist.
12pub(crate) fn flip_trait_bound(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
13 // Make sure we're in a `TypeBoundList`
14 ctx.node_at_offset::<TypeBoundList>()?;
15
16 // We want to replicate the behavior of `flip_binexpr` by only suggesting
17 // the assist when the cursor is on a `+`
18 let plus = ctx.token_at_offset().find(|tkn| tkn.kind() == T![+])?;
19
20 let (before, after) = (
21 non_trivia_sibling(plus.clone().into(), Direction::Prev)?,
22 non_trivia_sibling(plus.clone().into(), Direction::Next)?,
23 );
24
25 ctx.add_action(AssistId("flip_trait_bound"), "flip trait bound", |edit| {
26 edit.target(plus.text_range());
27 edit.replace(before.text_range(), after.to_string());
28 edit.replace(after.text_range(), before.to_string());
29 });
30
31 ctx.build()
32}
diff --git a/crates/ra_assists/src/lib.rs b/crates/ra_assists/src/lib.rs
index de576324f..871d49960 100644
--- a/crates/ra_assists/src/lib.rs
+++ b/crates/ra_assists/src/lib.rs
@@ -97,6 +97,7 @@ mod assists {
97 mod apply_demorgan; 97 mod apply_demorgan;
98 mod flip_comma; 98 mod flip_comma;
99 mod flip_binexpr; 99 mod flip_binexpr;
100 mod flip_trait_bound;
100 mod change_visibility; 101 mod change_visibility;
101 mod fill_match_arms; 102 mod fill_match_arms;
102 mod merge_match_arms; 103 mod merge_match_arms;
@@ -123,6 +124,7 @@ mod assists {
123 merge_match_arms::merge_match_arms, 124 merge_match_arms::merge_match_arms,
124 flip_comma::flip_comma, 125 flip_comma::flip_comma,
125 flip_binexpr::flip_binexpr, 126 flip_binexpr::flip_binexpr,
127 flip_trait_bound::flip_trait_bound,
126 introduce_variable::introduce_variable, 128 introduce_variable::introduce_variable,
127 replace_if_let_with_match::replace_if_let_with_match, 129 replace_if_let_with_match::replace_if_let_with_match,
128 split_import::split_import, 130 split_import::split_import,