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use join_to_string::join;
use ra_syntax::{
ast::{self, AstNode, NameOwner, TypeParamsOwner},
TextUnit,
};
use crate::assists::{AssistCtx, Assist};
pub fn add_impl(ctx: AssistCtx) -> Option<Assist> {
let nominal = ctx.node_at_offset::<ast::NominalDef>()?;
let name = nominal.name()?;
ctx.build("add impl", |edit| {
let type_params = nominal.type_param_list();
let start_offset = nominal.syntax().range().end();
let mut buf = String::new();
buf.push_str("\n\nimpl");
if let Some(type_params) = type_params {
type_params.syntax().text().push_to(&mut buf);
}
buf.push_str(" ");
buf.push_str(name.text().as_str());
if let Some(type_params) = type_params {
let lifetime_params = type_params
.lifetime_params()
.filter_map(|it| it.lifetime())
.map(|it| it.text());
let type_params = type_params
.type_params()
.filter_map(|it| it.name())
.map(|it| it.text());
join(lifetime_params.chain(type_params))
.surround_with("<", ">")
.to_buf(&mut buf);
}
buf.push_str(" {\n");
edit.set_cursor(start_offset + TextUnit::of_str(&buf));
buf.push_str("\n}");
edit.insert(start_offset, buf);
})
}
#[cfg(test)]
mod tests {
use super::*;
use crate::assists::check_assist;
#[test]
fn test_add_impl() {
check_assist(
add_impl,
"struct Foo {<|>}\n",
"struct Foo {}\n\nimpl Foo {\n<|>\n}\n",
);
check_assist(
add_impl,
"struct Foo<T: Clone> {<|>}",
"struct Foo<T: Clone> {}\n\nimpl<T: Clone> Foo<T> {\n<|>\n}",
);
check_assist(
add_impl,
"struct Foo<'a, T: Foo<'a>> {<|>}",
"struct Foo<'a, T: Foo<'a>> {}\n\nimpl<'a, T: Foo<'a>> Foo<'a, T> {\n<|>\n}",
);
}
}
|
