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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<Assist> {
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}", "::");
}
}
|
