feat(lsp): pass client_info on initialization (#4904)

Pass client name ('helix') and client version (version / git hash)
to LSP server on initialization.

2 files changed, 22 insertions, 0 deletions

diff --git a/helix-loader/build.rs b/helix-loader/build.rs
index e0ebd1c4..c4b89e6b 100644
--- a/helix-loader/build.rs
+++ b/helix-loader/build.rs
@@ -1,6 +1,26 @@
+use std::borrow::Cow;
+use std::process::Command;
+
+const VERSION: &str = include_str!("../VERSION");
+
 fn main() {
+    let git_hash = Command::new("git")
+        .args(["rev-parse", "HEAD"])
+        .output()
+        .ok()
+        .filter(|output| output.status.success())
+        .and_then(|x| String::from_utf8(x.stdout).ok());
+
+    let version: Cow<_> = match git_hash {
+        Some(git_hash) => format!("{} ({})", VERSION, &git_hash[..8]).into(),
+        None => VERSION.into(),
+    };
+
     println!(
         "cargo:rustc-env=BUILD_TARGET={}",
         std::env::var("TARGET").unwrap()
     );
+
+    println!("cargo:rerun-if-changed=../VERSION");
+    println!("cargo:rustc-env=VERSION_AND_GIT_HASH={}", version);
 }
diff --git a/helix-loader/src/lib.rs b/helix-loader/src/lib.rs
index a02a59af..29a9f2e7 100644
--- a/helix-loader/src/lib.rs
+++ b/helix-loader/src/lib.rs
@@ -4,6 +4,8 @@ pub mod grammar;
 use etcetera::base_strategy::{choose_base_strategy, BaseStrategy};
 use std::path::PathBuf;
 
+pub const VERSION_AND_GIT_HASH: &str = env!("VERSION_AND_GIT_HASH");
+
 pub static RUNTIME_DIR: once_cell::sync::Lazy<PathBuf> = once_cell::sync::Lazy::new(runtime_dir);
 
 static CONFIG_FILE: once_cell::sync::OnceCell<PathBuf> = once_cell::sync::OnceCell::new();