Added competition for unstable features

Added xtask for download unstable book from rust repository and codegene for it. Also small changes from lint

Cargo.toml

@@ -4,7 +4,7 @@ members = [ "crates/*", "xtask/" ]
 [profile.dev]
 # disabling debug info speeds up builds a bunch,
 # and we don't rely on it for debugging that much.
-debug = 0
+debug = 2
 
 [profile.release]
 incremental = true

crates/ra_hir/src/has_source.rs

@@ -1,4 +1,4 @@
-//! FIXME: write short doc here
+//! Provides set of implementation for hir's objects that allows get back location in file. 
 
 use either::Either;
 use hir_def::{

crates/ra_ide/src/completion.rs

@@ -18,13 +18,17 @@
 mod complete_postfix;
 mod complete_macro_in_item_position;
 mod complete_trait_impl;
-
+mod unstable_feature_descriptor;
 use ra_ide_db::RootDatabase;
 
 use crate::{
     completion::{
         completion_context::CompletionContext,
         completion_item::{CompletionKind, Completions},
+
+        //TODO: rework 
+        unstable_feature_descriptor::UNSTABLE_FEATURE_DESCRIPTOR,
+        complete_attribute::LintCompletion,
     },
     FilePosition,
 };

crates/ra_ide/src/completion/complete_attribute.rs

@@ -9,8 +9,11 @@
 use crate::completion::{
     completion_context::CompletionContext,
     completion_item::{CompletionItem, CompletionItemKind, CompletionKind, Completions},
+    unstable_feature_descriptor
 };
 
+use crate::completion::UNSTABLE_FEATURE_DESCRIPTOR;
+
 pub(super) fn complete_attribute(acc: &mut Completions, ctx: &CompletionContext) -> Option<()> {
     let attribute = ctx.attribute_under_caret.as_ref()?;
     match (attribute.path(), attribute.input()) {
@@ -19,12 +22,17 @@ pub(super) fn complete_attribute(acc: &mut Completions, ctx: &CompletionContext)
         {
             complete_derive(acc, ctx, token_tree)
         }
+        (Some(path), Some(ast::AttrInput::TokenTree(token_tree)))
+            if path.to_string() == "feature" =>
+        {
+            complete_lint(acc, ctx, token_tree, UNSTABLE_FEATURE_DESCRIPTOR);
+        }
         (Some(path), Some(ast::AttrInput::TokenTree(token_tree)))
             if ["allow", "warn", "deny", "forbid"]
                 .iter()
                 .any(|lint_level| lint_level == &path.to_string()) =>
         {
-            complete_lint(acc, ctx, token_tree)
+            complete_lint(acc, ctx, token_tree, DEFAULT_LINT_COMPLETIONS)
         }
         (_, Some(ast::AttrInput::TokenTree(_token_tree))) => {}
         _ => complete_attribute_start(acc, ctx, attribute),
@@ -87,7 +95,7 @@ const fn attr(
     attr(r#"deprecated = "…""#, Some("deprecated"), Some(r#"deprecated = "${0:reason}""#)),
     attr("derive(…)", Some("derive"), Some(r#"derive(${0:Debug})"#)),
     attr(r#"doc = "…""#, Some("doc"), Some(r#"doc = "${0:docs}""#)),
-    attr("feature(…)", Some("feature"), Some("feature(${0:flag})")).prefer_inner(),
+    attr("feature(…)", Some("feature"), Some("feature(${0:lint})")).prefer_inner(),
     attr("forbid(…)", Some("forbid"), Some("forbid(${0:lint})")),
     // FIXME: resolve through macro resolution?
     attr("global_allocator", None, None).prefer_inner(),
@@ -164,9 +172,9 @@ fn complete_derive(acc: &mut Completions, ctx: &CompletionContext, derive_input:
     }
 }
 
-fn complete_lint(acc: &mut Completions, ctx: &CompletionContext, derive_input: ast::TokenTree) {
+fn complete_lint(acc: &mut Completions, ctx: &CompletionContext, derive_input: ast::TokenTree, lints_completions: &[LintCompletion]) {
     if let Ok(existing_lints) = parse_comma_sep_input(derive_input) {
-        for lint_completion in DEFAULT_LINT_COMPLETIONS
+        for lint_completion in lints_completions
             .into_iter()
             .filter(|completion| !existing_lints.contains(completion.label))
         {
@@ -250,9 +258,9 @@ struct DeriveCompletion {
     DeriveCompletion { label: "Ord", dependencies: &["PartialOrd", "Eq", "PartialEq"] },
 ];
 
-struct LintCompletion {
-    label: &'static str,
-    description: &'static str,
+pub struct LintCompletion {
+    pub label: &'static str,
+    pub description: &'static str,
 }
 
 #[rustfmt::skip]

xtask/src/codegen.rs

@@ -9,6 +9,7 @@
 mod gen_parser_tests;
 mod gen_assists_docs;
 mod gen_feature_docs;
+mod gen_unstable_future_descriptor;
 
 use std::{
     fmt, mem,
@@ -22,8 +23,12 @@
     gen_feature_docs::generate_feature_docs,
     gen_parser_tests::generate_parser_tests,
     gen_syntax::generate_syntax,
+    gen_unstable_future_descriptor::generate_unstable_future_descriptor,
 };
 
+// Directory used by xtask 
+const STORAGE: &str = ".xtask";
+
 const GRAMMAR_DIR: &str = "crates/ra_parser/src/grammar";
 const OK_INLINE_TESTS_DIR: &str = "crates/ra_syntax/test_data/parser/inline/ok";
 const ERR_INLINE_TESTS_DIR: &str = "crates/ra_syntax/test_data/parser/inline/err";
@@ -35,6 +40,9 @@
 const ASSISTS_DIR: &str = "crates/ra_assists/src/handlers";
 const ASSISTS_TESTS: &str = "crates/ra_assists/src/tests/generated.rs";
 
+const REPOSITORY_URL: &str = "https://github.com/rust-lang/rust";
+const UNSTABLE_FEATURE: &str = "crates/ra_ide/src/completion/unstable_feature_descriptor.rs";
+
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
 pub enum Mode {
     Overwrite,

xtask/src/codegen/gen_unstable_future_descriptor.rs

@@ -0,0 +1,55 @@
+//! Generates descriptors structure for unstable feature from Unstable Book
+
+use crate::{
+    codegen::{self, project_root, Mode, Result},
+};
+use std::process::Command;
+use std::fs;
+use std::path::{Path, PathBuf};
+use walkdir::{DirEntry, WalkDir};
+use quote::{format_ident, quote};
+use crate::codegen::update;
+
+pub fn generate_unstable_future_descriptor(mode: Mode) -> Result<()> {
+    let path = project_root().join(codegen::STORAGE);
+    fs::create_dir_all(path.clone())?;
+
+    Command::new("git").current_dir(path.clone()).arg("init").output()?;
+    Command::new("git").current_dir(path.clone()).args(&["remote", "add", "-f", "origin", codegen::REPOSITORY_URL]).output()?;
+    Command::new("git").current_dir(path.clone()).args(&["sparse-checkout", "set", "/src/doc/unstable-book/src/"]).output()?;
+    Command::new("git").current_dir(path.clone()).args(&["pull", "origin", "master"]).output()?;
+    //TODO: check git, and do pull 
+
+    let src_dir = path.join("src/doc/unstable-book/src");
+    let files = WalkDir::new(src_dir.join("language-features"))
+        .into_iter()
+        .chain(WalkDir::new(src_dir.join("library-features")))
+        .filter_map(|e| e.ok())
+        .filter(|entry| {
+            // Get all `.md ` files
+            entry.file_type().is_file() && entry.path().extension().map(|ext| ext == "md").unwrap_or(false)
+        })
+        .collect::<Vec<_>>();
+
+    let definitions = files.iter().map(|entry| {
+        let path = entry.path();
+        let feature_ident = format!("{}", path.file_stem().unwrap().to_str().unwrap().replace("-", "_"));
+        let doc = format!("{}", std::fs::read_to_string(path).unwrap() );
+       
+        quote!{ LintCompletion { label: #feature_ident, description: #doc } }
+    }).collect::<Vec<_>>();
+    
+    let ts = quote! {
+        use crate::completion::LintCompletion;
+
+        const UNSTABLE_FEATURE_DESCRIPTOR:  &[LintCompletion] = &[
+            #(#definitions),*
+        ];
+    };
+    
+    let destination = project_root().join(codegen::UNSTABLE_FEATURE);
+    let contents = crate::reformat(ts.to_string())?;
+    update(destination.as_path(), &contents, mode)?;
+
+    Ok(())
+}

xtask/src/main.rs

@@ -76,6 +76,7 @@ fn main() -> Result<()> {
         "codegen" => {
             args.finish()?;
             codegen::generate_syntax(Mode::Overwrite)?;
+            codegen::generate_unstable_future_descriptor(Mode::Overwrite)?;
             codegen::generate_parser_tests(Mode::Overwrite)?;
             codegen::generate_assists_tests(Mode::Overwrite)?;
             codegen::generate_assists_docs(Mode::Overwrite)?;