add doctest support rust-lang#4317

Signed-off-by: Benjamin Coenen <5719034+bnjjj@users.noreply.github.com>

crates/ra_ide/src/runnables.rs

@@ -9,6 +9,7 @@ use ra_syntax::{
 };
 
 use crate::FileId;
+use ast::DocCommentsOwner;
 use std::fmt::Display;
 
 #[derive(Debug)]
@@ -37,6 +38,7 @@ pub enum RunnableKind {
     Test { test_id: TestId, attr: TestAttr },
     TestMod { path: String },
     Bench { test_id: TestId },
+    DocTest { test_id: TestId },
     Bin,
 }
 
@@ -81,6 +83,8 @@ fn runnable_fn(sema: &Semantics<RootDatabase>, fn_def: ast::FnDef) -> Option<Run
             RunnableKind::Test { test_id, attr }
         } else if fn_def.has_atom_attr("bench") {
             RunnableKind::Bench { test_id }
+        } else if has_doc_test(&fn_def) {
+            RunnableKind::DocTest { test_id }
         } else {
             return None;
         }
@@ -117,6 +121,10 @@ fn has_test_related_attribute(fn_def: &ast::FnDef) -> bool {
         .any(|attribute_text| attribute_text.contains("test"))
 }
 
+fn has_doc_test(fn_def: &ast::FnDef) -> bool {
+    fn_def.doc_comment_text().map_or(false, |comment| comment.contains("```"))
+}
+
 fn runnable_mod(sema: &Semantics<RootDatabase>, module: ast::Module) -> Option<Runnable> {
     let has_test_function = module
         .item_list()?
@@ -194,6 +202,41 @@ mod tests {
                 );
     }
 
+    #[test]
+    fn test_runnables_doc_test() {
+        let (analysis, pos) = analysis_and_position(
+            r#"
+        //- /lib.rs
+        <|> //empty
+        fn main() {}
+
+        /// ```
+        /// let x = 5;
+        /// ```
+        fn foo() {}
+        "#,
+        );
+        let runnables = analysis.runnables(pos.file_id).unwrap();
+        assert_debug_snapshot!(&runnables,
+        @r###"
+        [
+            Runnable {
+                range: 1..21,
+                kind: Bin,
+            },
+            Runnable {
+                range: 22..64,
+                kind: DocTest {
+                    test_id: Path(
+                        "foo",
+                    ),
+                },
+            },
+        ]
+        "###
+                );
+    }
+
     #[test]
     fn test_runnables_module() {
         let (analysis, pos) = analysis_and_position(

crates/rust-analyzer/src/cargo_target_spec.rs

@@ -27,40 +27,49 @@ impl CargoTargetSpec {
             RunnableKind::Test { test_id, attr } => {
                 args.push("test".to_string());
                 if let Some(spec) = spec {
-                    spec.push_to(&mut args);
+                    spec.push_to(&mut args, kind);
                 }
                 extra_args.push(test_id.to_string());
                 if let TestId::Path(_) = test_id {
                     extra_args.push("--exact".to_string());
                 }
                 extra_args.push("--nocapture".to_string());
                 if attr.ignore {
-                    extra_args.push("--ignored".to_string())
+                    extra_args.push("--ignored".to_string());
                 }
             }
             RunnableKind::TestMod { path } => {
                 args.push("test".to_string());
                 if let Some(spec) = spec {
-                    spec.push_to(&mut args);
+                    spec.push_to(&mut args, kind);
                 }
                 extra_args.push(path.to_string());
                 extra_args.push("--nocapture".to_string());
             }
             RunnableKind::Bench { test_id } => {
                 args.push("bench".to_string());
                 if let Some(spec) = spec {
-                    spec.push_to(&mut args);
+                    spec.push_to(&mut args, kind);
                 }
                 extra_args.push(test_id.to_string());
                 if let TestId::Path(_) = test_id {
                     extra_args.push("--exact".to_string());
                 }
                 extra_args.push("--nocapture".to_string());
             }
+            RunnableKind::DocTest { test_id } => {
+                args.push("test".to_string());
+                args.push("--doc".to_string());
+                if let Some(spec) = spec {
+                    spec.push_to(&mut args, kind);
+                }
+                extra_args.push(test_id.to_string());
+                extra_args.push("--nocapture".to_string());
+            }
             RunnableKind::Bin => {
                 args.push("run".to_string());
                 if let Some(spec) = spec {
-                    spec.push_to(&mut args);
+                    spec.push_to(&mut args, kind);
                 }
             }
         }
@@ -91,9 +100,14 @@ impl CargoTargetSpec {
         Ok(res)
     }
 
-    pub(crate) fn push_to(self, buf: &mut Vec<String>) {
+    pub(crate) fn push_to(self, buf: &mut Vec<String>, kind: &RunnableKind) {
         buf.push("--package".to_string());
         buf.push(self.package);
+
+        // Can't mix --doc with other target flags
+        if let RunnableKind::DocTest { .. } = kind {
+            return;
+        }
         match self.target_kind {
             TargetKind::Bin => {
                 buf.push("--bin".to_string());

crates/rust-analyzer/src/main_loop/handlers.rs

@@ -835,6 +835,7 @@ pub fn handle_code_lens(
     for runnable in world.analysis().runnables(file_id)? {
         let title = match &runnable.kind {
             RunnableKind::Test { .. } | RunnableKind::TestMod { .. } => "▶️\u{fe0e}Run Test",
+            RunnableKind::DocTest { .. } => "▶️\u{fe0e}Run Doctest",
             RunnableKind::Bench { .. } => "Run Bench",
             RunnableKind::Bin => "Run",
         }
@@ -1018,6 +1019,7 @@ fn to_lsp_runnable(
         RunnableKind::Test { test_id, .. } => format!("test {}", test_id),
         RunnableKind::TestMod { path } => format!("test-mod {}", path),
         RunnableKind::Bench { test_id } => format!("bench {}", test_id),
+        RunnableKind::DocTest { test_id, .. } => format!("doctest {}", test_id),
         RunnableKind::Bin => "run binary".to_string(),
     };
     Ok(req::Runnable {