5 files changed, 68 insertions, 18 deletions

diff --git a/xtask/src/codegen/gen_assists_docs.rs b/xtask/src/codegen/gen_assists_docs.rs
index 526941f73..f0ded8b87 100644
--- a/xtask/src/codegen/gen_assists_docs.rs
+++ b/xtask/src/codegen/gen_assists_docs.rs
@@ -3,7 +3,7 @@
 use std::{fmt, fs, path::Path};
 
 use crate::{
-    codegen::{self, extract_comment_blocks_with_empty_lines, Location, Mode},
+    codegen::{self, extract_comment_blocks_with_empty_lines, reformat, Location, Mode, PREAMBLE},
     project_root, rust_files, Result,
 };
 
@@ -15,7 +15,7 @@ pub fn generate_assists_tests(mode: Mode) -> Result<()> {
 pub fn generate_assists_docs(mode: Mode) -> Result<()> {
     let assists = Assist::collect()?;
     let contents = assists.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
-    let contents = contents.trim().to_string() + "\n";
+    let contents = format!("//{}\n{}\n", PREAMBLE, contents.trim());
     let dst = project_root().join("docs/user/generated_assists.adoc");
     codegen::update(&dst, &contents, mode)
 }
@@ -32,7 +32,7 @@ struct Assist {
 impl Assist {
     fn collect() -> Result<Vec<Assist>> {
         let mut res = Vec::new();
-        for path in rust_files(&project_root().join(codegen::ASSISTS_DIR)) {
+        for path in rust_files(&project_root().join("crates/assists/src/handlers")) {
             collect_file(&mut res, path.as_path())?;
         }
         res.sort_by(|lhs, rhs| lhs.id.cmp(&rhs.id));
@@ -134,8 +134,8 @@ r#####"
 
         buf.push_str(&test)
     }
-    let buf = crate::reformat(buf)?;
-    codegen::update(&project_root().join(codegen::ASSISTS_TESTS), &buf, mode)
+    let buf = reformat(buf)?;
+    codegen::update(&project_root().join("crates/assists/src/tests/generated.rs"), &buf, mode)
 }
 
 fn hide_hash_comments(text: &str) -> String {
diff --git a/xtask/src/codegen/gen_feature_docs.rs b/xtask/src/codegen/gen_feature_docs.rs
index 31bc3839d..3f0013e82 100644
--- a/xtask/src/codegen/gen_feature_docs.rs
+++ b/xtask/src/codegen/gen_feature_docs.rs
@@ -3,14 +3,14 @@
 use std::{fmt, fs, path::PathBuf};
 
 use crate::{
-    codegen::{self, extract_comment_blocks_with_empty_lines, Location, Mode},
+    codegen::{self, extract_comment_blocks_with_empty_lines, Location, Mode, PREAMBLE},
     project_root, rust_files, Result,
 };
 
 pub fn generate_feature_docs(mode: Mode) -> Result<()> {
     let features = Feature::collect()?;
     let contents = features.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
-    let contents = contents.trim().to_string() + "\n";
+    let contents = format!("//{}\n{}\n", PREAMBLE, contents.trim());
     let dst = project_root().join("docs/user/generated_features.adoc");
     codegen::update(&dst, &contents, mode)?;
     Ok(())
diff --git a/xtask/src/codegen/gen_features.rs b/xtask/src/codegen/gen_features.rs
new file mode 100644
index 000000000..78268308b
--- /dev/null
+++ b/xtask/src/codegen/gen_features.rs
@@ -0,0 +1,50 @@
+//! Generates descriptors structure for unstable feature from Unstable Book
+use std::path::{Path, PathBuf};
+
+use quote::quote;
+use walkdir::WalkDir;
+
+use crate::{
+    codegen::{project_root, reformat, update, Mode, Result},
+    not_bash::{fs2, run},
+};
+
+pub fn generate_features(mode: Mode) -> Result<()> {
+    if !Path::new("./target/rust").exists() {
+        run!("git clone https://github.com/rust-lang/rust ./target/rust")?;
+    }
+
+    let contents = generate_descriptor("./target/rust/src/doc/unstable-book/src".into())?;
+
+    let destination = project_root().join("crates/ide/src/completion/generated_features.rs");
+    update(destination.as_path(), &contents, mode)?;
+
+    Ok(())
+}
+
+fn generate_descriptor(src_dir: PathBuf) -> Result<String> {
+    let definitions = ["language-features", "library-features"]
+        .iter()
+        .flat_map(|it| WalkDir::new(src_dir.join(it)))
+        .filter_map(|e| e.ok())
+        .filter(|entry| {
+            // Get all `.md ` files
+            entry.file_type().is_file() && entry.path().extension().unwrap_or_default() == "md"
+        })
+        .map(|entry| {
+            let path = entry.path();
+            let feature_ident = path.file_stem().unwrap().to_str().unwrap().replace("-", "_");
+            let doc = fs2::read_to_string(path).unwrap();
+
+            quote! { LintCompletion { label: #feature_ident, description: #doc } }
+        });
+
+    let ts = quote! {
+        use crate::completion::complete_attribute::LintCompletion;
+
+        pub(super) const FEATURES:  &[LintCompletion] = &[
+            #(#definitions),*
+        ];
+    };
+    reformat(ts)
+}
diff --git a/xtask/src/codegen/gen_parser_tests.rs b/xtask/src/codegen/gen_parser_tests.rs
index 2977da2fa..96fdd9216 100644
--- a/xtask/src/codegen/gen_parser_tests.rs
+++ b/xtask/src/codegen/gen_parser_tests.rs
@@ -8,12 +8,12 @@ use std::{
 };
 
 use crate::{
-    codegen::{self, extract_comment_blocks, update, Mode},
+    codegen::{extract_comment_blocks, update, Mode},
     project_root, Result,
 };
 
 pub fn generate_parser_tests(mode: Mode) -> Result<()> {
-    let tests = tests_from_dir(&project_root().join(Path::new(codegen::GRAMMAR_DIR)))?;
+    let tests = tests_from_dir(&project_root().join(Path::new("crates/parser/src/grammar")))?;
     fn install_tests(tests: &HashMap<String, Test>, into: &str, mode: Mode) -> Result<()> {
         let tests_dir = project_root().join(into);
         if !tests_dir.is_dir() {
@@ -39,8 +39,8 @@ pub fn generate_parser_tests(mode: Mode) -> Result<()> {
         }
         Ok(())
     }
-    install_tests(&tests.ok, codegen::OK_INLINE_TESTS_DIR, mode)?;
-    install_tests(&tests.err, codegen::ERR_INLINE_TESTS_DIR, mode)
+    install_tests(&tests.ok, "crates/syntax/test_data/parser/inline/ok", mode)?;
+    install_tests(&tests.err, "crates/syntax/test_data/parser/inline/err", mode)
 }
 
 #[derive(Debug)]
diff --git a/xtask/src/codegen/gen_syntax.rs b/xtask/src/codegen/gen_syntax.rs
index dd1f4d6a2..53ae9f11c 100644
--- a/xtask/src/codegen/gen_syntax.rs
+++ b/xtask/src/codegen/gen_syntax.rs
@@ -14,7 +14,7 @@ use ungrammar::{rust_grammar, Grammar, Rule};
 
 use crate::{
     ast_src::{AstEnumSrc, AstNodeSrc, AstSrc, Cardinality, Field, KindsSrc, KINDS_SRC},
-    codegen::{self, update, Mode},
+    codegen::{reformat, update, Mode},
     project_root, Result,
 };
 
@@ -22,15 +22,15 @@ pub fn generate_syntax(mode: Mode) -> Result<()> {
     let grammar = rust_grammar();
     let ast = lower(&grammar);
 
-    let syntax_kinds_file = project_root().join(codegen::SYNTAX_KINDS);
+    let syntax_kinds_file = project_root().join("crates/parser/src/syntax_kind/generated.rs");
     let syntax_kinds = generate_syntax_kinds(KINDS_SRC)?;
     update(syntax_kinds_file.as_path(), &syntax_kinds, mode)?;
 
-    let ast_tokens_file = project_root().join(codegen::AST_TOKENS);
+    let ast_tokens_file = project_root().join("crates/syntax/src/ast/generated/tokens.rs");
     let contents = generate_tokens(&ast)?;
     update(ast_tokens_file.as_path(), &contents, mode)?;
 
-    let ast_nodes_file = project_root().join(codegen::AST_NODES);
+    let ast_nodes_file = project_root().join("crates/syntax/src/ast/generated/nodes.rs");
     let contents = generate_nodes(KINDS_SRC, &ast)?;
     update(ast_nodes_file.as_path(), &contents, mode)?;
 
@@ -61,7 +61,7 @@ fn generate_tokens(grammar: &AstSrc) -> Result<String> {
         }
     });
 
-    let pretty = crate::reformat(quote! {
+    let pretty = reformat(quote! {
         use crate::{SyntaxKind::{self, *}, SyntaxToken, ast::AstToken};
         #(#tokens)*
     })?
@@ -261,7 +261,7 @@ fn generate_nodes(kinds: KindsSrc<'_>, grammar: &AstSrc) -> Result<String> {
         }
     }
 
-    let pretty = crate::reformat(res)?;
+    let pretty = reformat(res)?;
     Ok(pretty)
 }
 
@@ -383,7 +383,7 @@ fn generate_syntax_kinds(grammar: KindsSrc<'_>) -> Result<String> {
         }
     };
 
-    crate::reformat(ast)
+    reformat(ast)
 }
 
 fn to_upper_snake_case(s: &str) -> String {