Infra changes for config.rs

This PR aims to cover the infrastructural requirements for the `rust-analyzer.toml` ( rust-lang#13529 ) issue. This means, that

1. We no longer have a single config base. The once single `ConfigData` has been divided into 4 : A tree of `.ratoml` files, a set of configs coming from the client ( this is what was called before the `CrateData` except that now values do not default to anything when they are not defined) , a set of configs that will reflect what the contents of a `ratoml` file defined in user's config directory ( e.g `~/.config/rust-analyzer/.rust-analyzer.toml` and finally a tree root that is populated by default values only.
2. Configs have also been divided into 3 different blocks : `global` , `local` , `client`. The current status of a config may change until rust-lang#13529 got merged.

crates/base-db/src/change.rs

@@ -24,8 +24,7 @@ impl fmt::Debug for FileChange {
             d.field("roots", roots);
         }
         if !self.files_changed.is_empty() {
-            d.field("files_changed", &self.files_changed);
-            // d.field("files_changed", &self.files_changed.len());
+            d.field("files_changed", &self.files_changed.len());
         }
         if self.crate_graph.is_some() {
             d.field("crate_graph", &self.crate_graph);

crates/base-db/src/input.rs

@@ -37,23 +37,16 @@ pub struct SourceRoot {
     /// Libraries are considered mostly immutable, this assumption is used to
     /// optimize salsa's query structure
     pub is_library: bool,
-    cargo_file_id: Option<FileId>,
-    /// FIXME : @alibektas We know that this is wrong.
-    /// base-db must stay as a level of abstraction
-    /// that has no knowledge of such specific files
-    /// so this should be moved somewhere else.
-    ratoml_file_id: Option<FileId>,
     file_set: FileSet,
 }
 
 impl SourceRoot {
     pub fn new_local(file_set: FileSet) -> SourceRoot {
-        eprintln!("{:#?}", file_set);
-        SourceRoot { is_library: false, file_set, cargo_file_id: None, ratoml_file_id: None }
+        SourceRoot { is_library: false, file_set }
     }
 
     pub fn new_library(file_set: FileSet) -> SourceRoot {
-        SourceRoot { is_library: true, file_set, cargo_file_id: None, ratoml_file_id: None }
+        SourceRoot { is_library: true, file_set }
     }
 
     pub fn path_for_file(&self, file: &FileId) -> Option<&VfsPath> {
@@ -71,16 +64,6 @@ impl SourceRoot {
     pub fn iter(&self) -> impl Iterator<Item = FileId> + '_ {
         self.file_set.iter()
     }
-
-    /// Get `FileId` of the `Cargo.toml` if one present in `SourceRoot`
-    pub fn cargo_toml(&self) -> Option<FileId> {
-        self.cargo_file_id
-    }
-
-    /// Get `FileId` of the `rust-analyzer.toml` if one present in `SourceRoot`
-    pub fn ratoml(&self) -> Option<FileId> {
-        self.ratoml_file_id
-    }
 }
 
 /// `CrateGraph` is a bit of information which turns a set of text files into a

crates/ide/src/lib.rs

@@ -66,7 +66,7 @@ use hir::ChangeWithProcMacros;
 use ide_db::{
     base_db::{
         salsa::{self, ParallelDatabase},
-        CrateOrigin, Env, FileLoader, FileSet, SourceDatabase, VfsPath,
+        CrateOrigin, Env, FileLoader, FileSet, SourceDatabase, SourceDatabaseExt, VfsPath,
     },
     prime_caches, symbol_index, FxHashMap, FxIndexSet, LineIndexDatabase,
 };
@@ -272,6 +272,10 @@ impl Analysis {
         self.with_db(|db| status::status(db, file_id))
     }
 
+    pub fn source_root(&self, file_id: FileId) -> Cancellable<SourceRootId> {
+        self.with_db(|db| db.file_source_root(file_id))
+    }
+
     pub fn parallel_prime_caches<F>(&self, num_worker_threads: u8, cb: F) -> Cancellable<()>
     where
         F: Fn(ParallelPrimeCachesProgress) + Sync + std::panic::UnwindSafe,
@@ -281,7 +285,7 @@ impl Analysis {
 
     /// Gets the text of the source file.
     pub fn file_text(&self, file_id: FileId) -> Cancellable<Arc<str>> {
-        self.with_db(|db| db.file_text(file_id))
+        self.with_db(|db| SourceDatabaseExt::file_text(db, file_id))
     }
 
     /// Gets the syntax tree of the file.
@@ -291,7 +295,6 @@ impl Analysis {
 
     /// Returns true if this file belongs to an immutable library.
     pub fn is_library_file(&self, file_id: FileId) -> Cancellable<bool> {
-        use ide_db::base_db::SourceDatabaseExt;
         self.with_db(|db| db.source_root(db.file_source_root(file_id)).is_library)
     }