1 files changed, 78 insertions, 0 deletions

diff --git a/crates/ra_lsp_server/src/project_model/sysroot.rs b/crates/ra_lsp_server/src/project_model/sysroot.rs
index e69de29bb..ae72c9c17 100644
--- a/crates/ra_lsp_server/src/project_model/sysroot.rs
+++ b/crates/ra_lsp_server/src/project_model/sysroot.rs
@@ -0,0 +1,78 @@
+use std::{
+    path::{Path, PathBuf},
+    process::Command,
+};
+
+use ra_syntax::SmolStr;
+use rustc_hash::FxHashMap;
+
+use crate::Result;
+
+#[derive(Debug, Clone)]
+pub struct Sysroot {
+    crates: FxHashMap<SmolStr, PathBuf>,
+}
+
+impl Sysroot {
+    pub(crate) fn discover(cargo_toml: &Path) -> Result<Sysroot> {
+        let rustc_output = Command::new("rustc")
+            .current_dir(cargo_toml.parent().unwrap())
+            .args(&["--print", "sysroot"])
+            .output()?;
+        if !rustc_output.status.success() {
+            failure::bail!("failed to locate sysroot")
+        }
+        let stdout = String::from_utf8(rustc_output.stdout)?;
+        let sysroot_path = Path::new(stdout.trim());
+        let src = sysroot_path.join("lib/rustlib/src/rust/src");
+
+        let crates: &[(&str, &[&str])] = &[
+            (
+                "std",
+                &[
+                    "alloc_jemalloc",
+                    "alloc_system",
+                    "panic_abort",
+                    "rand",
+                    "compiler_builtins",
+                    "unwind",
+                    "rustc_asan",
+                    "rustc_lsan",
+                    "rustc_msan",
+                    "rustc_tsan",
+                    "build_helper",
+                ],
+            ),
+            ("core", &[]),
+            ("alloc", &[]),
+            ("collections", &[]),
+            ("libc", &[]),
+            ("panic_unwind", &[]),
+            ("proc_macro", &[]),
+            ("rustc_unicode", &[]),
+            ("std_unicode", &[]),
+            ("test", &[]),
+            // Feature gated
+            ("alloc_jemalloc", &[]),
+            ("alloc_system", &[]),
+            ("compiler_builtins", &[]),
+            ("getopts", &[]),
+            ("panic_unwind", &[]),
+            ("panic_abort", &[]),
+            ("rand", &[]),
+            ("term", &[]),
+            ("unwind", &[]),
+            // Dependencies
+            ("build_helper", &[]),
+            ("rustc_asan", &[]),
+            ("rustc_lsan", &[]),
+            ("rustc_msan", &[]),
+            ("rustc_tsan", &[]),
+            ("syntax", &[]),
+        ];
+
+        Ok(Sysroot {
+            crates: FxHashMap::default(),
+        })
+    }
+}