use hir::db::HirDatabase; use ra_syntax::{ TextUnit, AstNode, SyntaxKind::COLONCOLON, ast, algo::generate, }; use crate::{AssistCtx, Assist}; pub(crate) fn split_import(ctx: AssistCtx) -> Option { let colon_colon = ctx.leaf_at_offset().find(|leaf| leaf.kind() == COLONCOLON)?; let path = colon_colon.parent().and_then(ast::Path::cast)?; let top_path = generate(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.range().end(); let r_curly = match top_path.syntax().parent().and_then(ast::UseTree::cast) { Some(tree) => tree.syntax().range().end(), None => top_path.syntax().range().end(), }; ctx.build("split import", |edit| { edit.target(colon_colon.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 algo:<|>:visitor::{Visitor, visit}", "use algo::{<|>visitor::{Visitor, visit}}", ) } #[test] fn split_import_target() { check_assist_target(split_import, "use algo::<|>visitor::{Visitor, visit}", "::"); } }