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Auto merge of #15434 - alibektas:deunwrap/generate_derive, r=lnicola

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minor : Deunwrap generate_derive

#15398 subtask 1. Since the editing closure has arms, I did something *experimental* ( in this case just a clever term for bad code ) to bypass creating an `Option` but I am ready to change this.
This commit is contained in:
bors 2023-08-18 16:16:27 +00:00
commit c0f6ece3c4
1 changed files with 25 additions and 12 deletions
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37
crates/ide-assists/src/handlers/generate_derive.rs
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@ -27,13 +27,19 @@ pub(crate) fn generate_derive(acc: &mut Assists, ctx: &AssistContext<'_>) -> Opt
let cap = ctx.config.snippet_cap?;
let nominal = ctx.find_node_at_offset::<ast::Adt>()?;
let target = nominal.syntax().text_range();
let derive_attr = nominal
.attrs()
.filter_map(|x| x.as_simple_call())
.filter(|(name, _arg)| name == "derive")
.map(|(_name, arg)| arg)
.next();
let delimiter = match &derive_attr {
None => None,
Some(tt) => Some(tt.right_delimiter_token()?),
};
acc.add(AssistId("generate_derive", AssistKind::Generate), "Add `#[derive]`", target, |edit| {
let derive_attr = nominal
.attrs()
.filter_map(|x| x.as_simple_call())
.filter(|(name, _arg)| name == "derive")
.map(|(_name, arg)| arg)
.next();
match derive_attr {
None => {
let derive = make::attr_outer(make::meta_token_tree(
@ -45,16 +51,23 @@ pub(crate) fn generate_derive(acc: &mut Assists, ctx: &AssistContext<'_>) -> Opt
let nominal = edit.make_mut(nominal);
nominal.add_attr(derive.clone());
let delimiter = derive
.meta()
.expect("make::attr_outer was expected to have Meta")
.token_tree()
.expect("failed to get token tree out of Meta")
.r_paren_token()
.expect("make::attr_outer was expected to have a R_PAREN");
edit.add_tabstop_before_token(cap, delimiter);
}
Some(_) => {
// Just move the cursor.
edit.add_tabstop_before_token(
cap,
derive.meta().unwrap().token_tree().unwrap().r_paren_token().unwrap(),
delimiter.expect("Right delim token could not be found."),
);
}
Some(tt) => {
// Just move the cursor.
let tt = edit.make_mut(tt);
edit.add_tabstop_before_token(cap, tt.right_delimiter_token().unwrap());
}
};
})
}