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|
use std::iter::successors;
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 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 target = colon_colon.text_range();
acc.add(AssistId("split_import", AssistKind::RefactorRewrite), "Split import", target, |edit| {
edit.replace_ast(use_tree, new_tree);
})
}
#[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() {}",
);
}
}
|
