Make ConfigData Ser and TOML De

In order to achieve this, I had to virtually rewrite ConfigData's default values to their typed versions. It ended up looking not so well.
I will think of something to fix this. In addition to this, some default value have been hastily modified but config manual generation will
be a stay as a reminder to fix this.

Author: alibektas

Cargo.lock

@@ -27,3 +27,4 @@ syntax.workspace = true
 test-utils.workspace = true
 tt.workspace = true
 vfs.workspace = true
+serde.workspace = true

crates/base-db/Cargo.toml

@@ -11,6 +11,7 @@ use std::{fmt, mem, ops, panic::RefUnwindSafe, str::FromStr, sync};
 use cfg::CfgOptions;
 use la_arena::{Arena, Idx};
 use rustc_hash::{FxHashMap, FxHashSet};
+use serde::Serialize;
 use syntax::SmolStr;
 use triomphe::Arc;
 use tt::token_id::Subtree;
@@ -39,6 +40,10 @@ pub struct SourceRoot {
     /// 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,
 }
@@ -116,6 +121,15 @@ pub type CrateId = Idx<CrateData>;
 #[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub struct CrateName(SmolStr);
 
+impl Serialize for CrateName {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(self)
+    }
+}
+
 impl CrateName {
     /// Creates a crate name, checking for dashes in the string provided.
     /// Dashes are not allowed in the crate names,

crates/base-db/src/input.rs

@@ -4,8 +4,9 @@
 use std::{fmt, str::FromStr};
 
 use cfg::CfgOptions;
+use serde::Serialize;
 
-#[derive(Clone, Eq, PartialEq, Debug)]
+#[derive(Clone, Eq, PartialEq, Debug, Serialize)]
 pub enum CfgFlag {
     Atom(String),
     KeyValue { key: String, value: String },

crates/project-model/src/cfg_flag.rs

@@ -53,7 +53,7 @@ use base_db::{CrateDisplayName, CrateId, CrateName, Dependency, Edition};
 use la_arena::RawIdx;
 use paths::{AbsPath, AbsPathBuf};
 use rustc_hash::FxHashMap;
-use serde::{de, Deserialize};
+use serde::{de, Deserialize, Serialize};
 use std::path::PathBuf;
 
 use crate::cfg_flag::CfgFlag;
@@ -174,14 +174,14 @@ impl ProjectJson {
     }
 }
 
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct ProjectJsonData {
     sysroot: Option<PathBuf>,
     sysroot_src: Option<PathBuf>,
     crates: Vec<CrateData>,
 }
 
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 struct CrateData {
     display_name: Option<String>,
     root_module: PathBuf,
@@ -203,7 +203,7 @@ struct CrateData {
     repository: Option<String>,
 }
 
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 #[serde(rename = "edition")]
 enum EditionData {
     #[serde(rename = "2015")]
@@ -224,7 +224,7 @@ impl From<EditionData> for Edition {
     }
 }
 
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 struct DepData {
     /// Identifies a crate by position in the crates array.
     #[serde(rename = "crate")]
@@ -233,7 +233,7 @@ struct DepData {
     name: CrateName,
 }
 
-#[derive(Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 struct CrateSource {
     include_dirs: Vec<PathBuf>,
     exclude_dirs: Vec<PathBuf>,

crates/project-model/src/project_json.rs

@@ -44,6 +44,7 @@ tracing-subscriber = { version = "0.3.16", default-features = false, features =
 tracing-log = "0.1.3"
 tracing-tree = "0.2.1"
 triomphe.workspace = true
+toml = "0.8.8"
 nohash-hasher.workspace = true
 always-assert = "0.1.2"