Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/ide-assists/src/handlers/split_import.rs')
| -rw-r--r-- | crates/ide-assists/src/handlers/split_import.rs | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/crates/ide-assists/src/handlers/split_import.rs b/crates/ide-assists/src/handlers/split_import.rs new file mode 100644 index 0000000000..ac67874b31 --- /dev/null +++ b/crates/ide-assists/src/handlers/split_import.rs @@ -0,0 +1,82 @@ +use syntax::{ast, AstNode, T}; + +use crate::{AssistContext, AssistId, AssistKind, Assists}; + +// Assist: split_import +// +// Wraps the tail of import into braces. +// +// ``` +// use std::$0collections::HashMap; +// ``` +// -> +// ``` +// use std::{collections::HashMap}; +// ``` +pub(crate) fn split_import(acc: &mut Assists, ctx: &AssistContext) -> Option<()> { + let colon_colon = ctx.find_token_syntax_at_offset(T![::])?; + let path = ast::Path::cast(colon_colon.parent()?)?.qualifier()?; + + let use_tree = path.top_path().syntax().ancestors().find_map(ast::UseTree::cast)?; + + let has_errors = use_tree + .syntax() + .descendants_with_tokens() + .any(|it| it.kind() == syntax::SyntaxKind::ERROR); + let last_segment = use_tree.path().and_then(|it| it.segment()); + if has_errors || last_segment.is_none() { + return None; + } + + let target = colon_colon.text_range(); + acc.add(AssistId("split_import", AssistKind::RefactorRewrite), "Split import", target, |edit| { + let use_tree = edit.make_mut(use_tree.clone()); + let path = edit.make_mut(path); + use_tree.split_prefix(&path); + }) +} + +#[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::$0db::RootDatabase;", + "use crate::{db::RootDatabase};", + ) + } + + #[test] + fn split_import_works_with_trees() { + check_assist( + split_import, + "use crate:$0:db::{RootDatabase, FileSymbol}", + "use crate::{db::{RootDatabase, FileSymbol}}", + ) + } + + #[test] + fn split_import_target() { + check_assist_target(split_import, "use crate::$0db::{RootDatabase, FileSymbol}", "::"); + } + + #[test] + fn issue4044() { + check_assist_not_applicable(split_import, "use crate::$0:::self;") + } + + #[test] + fn test_empty_use() { + check_assist_not_applicable( + split_import, + r" +use std::$0 +fn main() {}", + ); + } +} |