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use hir::db::HirDatabase;
use ra_syntax::{
Direction,
SyntaxKind::COMMA,
};
use crate::{AssistCtx, Assist, non_trivia_sibling};
pub(crate) fn flip_comma(ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
let comma = ctx.leaf_at_offset().find(|leaf| leaf.kind() == COMMA)?;
let prev = non_trivia_sibling(comma, Direction::Prev)?;
let next = non_trivia_sibling(comma, Direction::Next)?;
ctx.build("flip comma", |edit| {
edit.replace(prev.range(), next.text());
edit.replace(next.range(), prev.text());
})
}
#[cfg(test)]
mod tests {
use super::*;
use crate::helpers::check_assist;
#[test]
fn flip_comma_works_for_function_parameters() {
check_assist(
flip_comma,
"fn foo(x: i32,<|> y: Result<(), ()>) {}",
"fn foo(y: Result<(), ()>,<|> x: i32) {}",
)
}
}
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