use std::iter::successors; use ra_syntax::{ast, AstNode, T}; use crate::{Assist, AssistCtx, AssistId}; // Assist: split_import // // Wraps the tail of import into braces. // // ``` // use std::<|>collections::HashMap; // ``` // -> // ``` // use std::{collections::HashMap}; // ``` pub(crate) fn split_import(ctx: AssistCtx) -> Option { let colon_colon = ctx.find_token_at_offset(T![::])?; let path = ast::Path::cast(colon_colon.parent())?.qualifier()?; let top_path = successors(Some(path.clone()), |it| it.parent_path()).last()?; let use_tree = top_path.syntax().ancestors().find_map(ast::UseTree::cast)?; let new_tree = use_tree.split_prefix(&path); if new_tree == use_tree { return None; } let cursor = ctx.frange.range.start(); ctx.add_assist(AssistId("split_import"), "Split import", |edit| { edit.target(colon_colon.text_range()); edit.replace_ast(use_tree, new_tree); edit.set_cursor(cursor); }) } #[cfg(test)] mod tests { use crate::tests::{check_assist, check_assist_not_applicable, check_assist_target}; use super::*; #[test] fn test_split_import() { check_assist( split_import, "use crate::<|>db::RootDatabase;", "use crate::<|>{db::RootDatabase};", ) } #[test] fn split_import_works_with_trees() { check_assist( split_import, "use crate:<|>:db::{RootDatabase, FileSymbol}", "use crate:<|>:{db::{RootDatabase, FileSymbol}}", ) } #[test] fn split_import_target() { check_assist_target(split_import, "use crate::<|>db::{RootDatabase, FileSymbol}", "::"); } #[test] fn issue4044() { check_assist_not_applicable(split_import, "use crate::<|>:::self;") } }