feat: add eager flag and workspace symbols feature

Allow passing in an `--eager` flag to the LSP to make it eagerly load
all relevant files in the workspace. When this flag is provided, files
are not removed from the `last_valid_parse` cache when they are closed.

In addition, this flag enables the LSP to provide workspace symbol
information.

Author: MaartenStaa

starlark_bin/bin/bazel.rs

@@ -141,6 +141,7 @@ pub(crate) fn main(
     prelude: &[PathBuf],
     dialect: Dialect,
     globals: Globals,
+    eager: bool,
 ) -> anyhow::Result<()> {
     if !lsp {
         return Err(anyhow::anyhow!("Bazel mode only supports `--lsp`"));
@@ -154,6 +155,7 @@ pub(crate) fn main(
         is_interactive,
         dialect,
         globals,
+        eager,
     )?;
 
     ctx.mode = ContextMode::Check;
@@ -173,6 +175,7 @@ pub(crate) struct BazelContext {
     pub(crate) globals: Globals,
     pub(crate) builtin_docs: HashMap<LspUrl, String>,
     pub(crate) builtin_symbols: HashMap<String, LspUrl>,
+    pub(crate) eager: bool,
 }
 
 impl BazelContext {
@@ -187,6 +190,7 @@ impl BazelContext {
         module: bool,
         dialect: Dialect,
         globals: Globals,
+        eager: bool,
     ) -> anyhow::Result<Self> {
         let prelude: Vec<_> = prelude
             .iter()
@@ -263,6 +267,7 @@ impl BazelContext {
             }),
             external_output_base: output_base
                 .map(|output_base| PathBuf::from(output_base).join("external")),
+            eager,
         })
     }
 
@@ -886,4 +891,8 @@ impl LspContext for BazelContext {
 
         Ok(names)
     }
+
+    fn is_eager(&self) -> bool {
+        self.eager
+    }
 }

starlark_bin/bin/eval.rs

@@ -70,6 +70,7 @@ pub(crate) struct Context {
     pub(crate) globals: Globals,
     pub(crate) builtin_docs: HashMap<LspUrl, String>,
     pub(crate) builtin_symbols: HashMap<String, LspUrl>,
+    pub(crate) eager: bool,
 }
 
 /// The outcome of evaluating (checking, parsing or running) given starlark code.
@@ -101,6 +102,7 @@ impl Context {
         module: bool,
         dialect: Dialect,
         globals: Globals,
+        eager: bool,
     ) -> anyhow::Result<Self> {
         let prelude: Vec<_> = prelude
             .iter()
@@ -143,6 +145,7 @@ impl Context {
             globals,
             builtin_docs,
             builtin_symbols,
+            eager,
         })
     }
 
@@ -379,4 +382,8 @@ impl LspContext for Context {
     fn get_environment(&self, _uri: &LspUrl) -> DocModule {
         DocModule::default()
     }
+
+    fn is_eager(&self) -> bool {
+        self.eager
+    }
 }

starlark_bin/bin/main.rs

@@ -142,6 +142,9 @@ struct Args {
     )]
     files: Vec<PathBuf>,
 
+    #[arg(long = "eager", help = "In LSP mode, eagerly load all files.")]
+    eager: bool,
+
     #[arg(
         long = "bazel",
         help = "Run in Bazel mode (temporary, will be removed)"
@@ -298,6 +301,7 @@ fn main() -> anyhow::Result<()> {
                 &prelude,
                 dialect,
                 globals,
+                args.eager,
             )?;
             return Ok(());
         }
@@ -313,6 +317,7 @@ fn main() -> anyhow::Result<()> {
             is_interactive,
             dialect,
             globals,
+            args.eager,
         )?;
 
         if args.lsp {