Merge #8624

8624: Automatically detect rust library source file map  r=vsrs a=vsrs

This PR adds a new possible `rust-analyzer.debug.sourceFileMap` value:
```json
{
    "rust-analyzer.debug.sourceFileMap": "auto"
}
```

I did not make it the default because it uses two shell calls (`rustc --print sysroot` and `rustc -V -v`). First one can be slow (https://github.com/rust-lang/rustup/issues/783)

Fixes #8619

Co-authored-by: vsrs <[email protected]>

1 files changed, 19 insertions, 1 deletions

diff --git a/editors/code/src/toolchain.ts b/editors/code/src/toolchain.ts
index a5dc3cf0c..68826c478 100644
--- a/editors/code/src/toolchain.ts
+++ b/editors/code/src/toolchain.ts
@@ -4,7 +4,7 @@ import * as path from 'path';
 import * as fs from 'fs';
 import * as readline from 'readline';
 import { OutputChannel } from 'vscode';
-import { log, memoize } from './util';
+import { execute, log, memoize } from './util';
 
 interface CompilationArtifact {
     fileName: string;
@@ -121,6 +121,24 @@ export class Cargo {
     }
 }
 
+/** Mirrors `project_model::sysroot::discover_sysroot_dir()` implementation*/
+export function getSysroot(dir: string): Promise<string> {
+    const rustcPath = getPathForExecutable("rustc");
+
+    // do not memoize the result because the toolchain may change between runs
+    return execute(`${rustcPath} --print sysroot`, { cwd: dir });
+}
+
+export async function getRustcId(dir: string): Promise<string> {
+    const rustcPath = getPathForExecutable("rustc");
+
+    // do not memoize the result because the toolchain may change between runs
+    const data = await execute(`${rustcPath} -V -v`, { cwd: dir });
+    const rx = /commit-hash:\s(.*)$/m.compile();
+
+    return rx.exec(data)![1];
+}
+
 /** Mirrors `toolchain::cargo()` implementation */
 export function cargoPath(): string {
     return getPathForExecutable("cargo");