use std::iter::successors; use ra_syntax::{ast, AstNode, TextUnit, 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())?; let top_path = successors(Some(path), |it| it.parent_path()).last()?; let use_tree = top_path.syntax().ancestors().find_map(ast::UseTree::cast); if use_tree.is_none() { return None; } let l_curly = colon_colon.text_range().end(); let r_curly = match top_path.syntax().parent().and_then(ast::UseTree::cast) { Some(tree) => tree.syntax().text_range().end(), None => top_path.syntax().text_range().end(), }; ctx.add_assist(AssistId("split_import"), "Split import", |edit| { edit.target(colon_colon.text_range()); edit.insert(l_curly, "{"); edit.insert(r_curly, "}"); edit.set_cursor(l_curly + TextUnit::of_str("{")); }) } #[cfg(test)] mod tests { use super::*; use crate::helpers::{check_assist, check_assist_target}; #[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}", "::"); } }