Doctest autoimport

Author: matklad

crates/ra_assists/src/assists/auto_import.rs

@@ -18,14 +18,16 @@ use ra_ide_db::imports_locator::ImportsLocatorIde;
 // fn main() {
 //     let map = HashMap<|>::new();
 // }
+// # pub mod std { pub mod collections { pub struct HashMap { } } }
 // ```
 // ->
 // ```
 // use std::collections::HashMap;
 //
 // fn main() {
-//     let map = HashMap<|>::new();
+//     let map = HashMap::new();
 // }
+// # pub mod std { pub mod collections { pub struct HashMap { } } }
 // ```
 pub(crate) fn auto_import(ctx: AssistCtx) -> Option<Assist> {
     let path_to_import: ast::Path = ctx.find_node_at_offset()?;

crates/ra_assists/src/doc_tests.rs

@@ -5,18 +5,12 @@
 
 mod generated;
 
-use ra_db::{fixture::WithFixture, FileRange};
+use ra_db::FileRange;
 use test_utils::{assert_eq_text, extract_range_or_offset};
 
-use ra_ide_db::RootDatabase;
-
 fn check(assist_id: &str, before: &str, after: &str) {
-    // FIXME we cannot get the imports search functionality here yet, but still need to generate a test and a doc for an assist
-    if assist_id == "auto_import" {
-        return;
-    }
     let (selection, before) = extract_range_or_offset(before);
-    let (db, file_id) = RootDatabase::with_single_file(&before);
+    let (db, file_id) = crate::helpers::with_single_file(&before);
     let frange = FileRange { file_id, range: selection.into() };
 
     let assist = crate::assists(&db, frange)

crates/ra_assists/src/doc_tests/generated.rs

@@ -222,13 +222,15 @@ fn doctest_auto_import() {
 fn main() {
     let map = HashMap<|>::new();
 }
+pub mod std { pub mod collections { pub struct HashMap { } } }
 "#####,
         r#####"
 use std::collections::HashMap;
 
 fn main() {
-    let map = HashMap<|>::new();
+    let map = HashMap::new();
 }
+pub mod std { pub mod collections { pub struct HashMap { } } }
 "#####,
     )
 }

docs/user/assists.md

@@ -223,7 +223,7 @@ fn main() {
 use std::collections::HashMap;
 
 fn main() {
-    let map = HashMap┃::new();
+    let map = HashMap::new();
 }
 ```
 

xtask/src/codegen/gen_assists_docs.rs

@@ -20,6 +20,28 @@ struct Assist {
     after: String,
 }
 
+fn hide_hash_comments(text: &str) -> String {
+    text.split('\n') // want final newline
+        .filter(|&it| !(it.starts_with("# ") || it == "#"))
+        .map(|it| format!("{}\n", it))
+        .collect()
+}
+
+fn reveal_hash_comments(text: &str) -> String {
+    text.split('\n') // want final newline
+        .map(|it| {
+            if it.starts_with("# ") {
+                &it[2..]
+            } else if it == "#" {
+                ""
+            } else {
+                it
+            }
+        })
+        .map(|it| format!("{}\n", it))
+        .collect()
+}
+
 fn collect_assists() -> Result<Vec<Assist>> {
     let mut res = Vec::new();
     for entry in fs::read_dir(project_root().join(codegen::ASSISTS_DIR))? {
@@ -91,13 +113,14 @@ fn doctest_{}() {{
     check(
         "{}",
 r#####"
-{}
-"#####, r#####"
-{}
-"#####)
+{}"#####, r#####"
+{}"#####)
 }}
 "######,
-            assist.id, assist.id, assist.before, assist.after
+            assist.id,
+            assist.id,
+            reveal_hash_comments(&assist.before),
+            reveal_hash_comments(&assist.after)
         );
 
         buf.push_str(&test)
@@ -123,12 +146,13 @@ fn generate_docs(assists: &[Assist], mode: Mode) -> Result<()> {
 ```rust
 // BEFORE
 {}
-
 // AFTER
-{}
-```
+{}```
 ",
-            assist.id, assist.doc, before, after
+            assist.id,
+            assist.doc,
+            hide_hash_comments(&before),
+            hide_hash_comments(&after)
         );
         buf.push_str(&docs);
     }