rust-project: Don't include all buildfiles by default

Summary:
Add `--include-all-buildfiles` flag that controls whether `build` is included in every crate.

With a default of `false`, this works around an issue where rust-analyzer tries to load all files from the parent of `build.build_file` which results in loading all of `third-party/rust`.

Reviewed By: Wilfred

Differential Revision: D68453686

fbshipit-source-id: 4478720b2b5bec2d9ce619e000427d58c48c8940

integrations/rust-project/src/buck.rs

@@ -51,6 +51,7 @@ pub(crate) fn to_json_project(
     aliases: FxHashMap<Target, AliasedTargetInfo>,
     relative_paths: bool,
     check_cycles: bool,
+    include_all_buildfiles: bool,
 ) -> Result<JsonProject, anyhow::Error> {
     let mode = select_mode(None);
     let buck = Buck::new(mode);
@@ -159,11 +160,16 @@ pub(crate) fn to_json_project(
             include_dirs.insert(parent.to_owned());
         }
 
-        let build = Some(Build {
-            label: target.clone(),
-            build_file: build_file.to_owned(),
-            target_kind: info.kind.clone().into(),
-        });
+        let build = if include_all_buildfiles || info.in_workspace {
+            let build = Build {
+                label: target.clone(),
+                build_file: build_file.to_owned(),
+                target_kind: info.kind.clone().into(),
+            };
+            Some(build)
+        } else {
+            None
+        };
 
         let crate_info = Crate {
             display_name: Some(info.display_name()),

integrations/rust-project/src/cli/develop.rs

@@ -38,6 +38,7 @@ pub(crate) struct Develop {
     pub(crate) buck: buck::Buck,
     pub(crate) check_cycles: bool,
     pub(crate) invoked_by_ra: bool,
+    pub(crate) include_all_buildfiles: bool,
 }
 
 pub(crate) struct OutputCfg {
@@ -64,6 +65,7 @@ impl Develop {
             relative_paths,
             mode,
             check_cycles,
+            include_all_buildfiles,
             ..
         } = command
         {
@@ -90,6 +92,7 @@ impl Develop {
                 buck,
                 check_cycles,
                 invoked_by_ra: false,
+                include_all_buildfiles,
             };
             let out = OutputCfg { out, pretty };
 
@@ -131,6 +134,7 @@ impl Develop {
                 buck,
                 check_cycles: false,
                 invoked_by_ra: true,
+                include_all_buildfiles: false,
             };
             let out = OutputCfg { out, pretty: false };
 
@@ -230,6 +234,7 @@ impl Develop {
             relative_paths,
             buck,
             check_cycles,
+            include_all_buildfiles,
             ..
         } = self;
 
@@ -269,6 +274,7 @@ impl Develop {
             aliased_libraries,
             *relative_paths,
             *check_cycles,
+            *include_all_buildfiles,
         )?;
 
         Ok(rust_project)

integrations/rust-project/src/main.rs

@@ -111,6 +111,10 @@ enum Command {
         /// Optional argument specifying build mode.
         #[clap(short = 'm', long)]
         mode: Option<String>,
+
+        /// Include a `build` section for every crate, including dependencies. Otherwise, `build` is only included for crates in the workspace.
+        #[clap(long)]
+        include_all_buildfiles: bool,
     },
     /// `DevelopJson` is a more limited, stripped down [`Command::Develop`].
     ///