libkookie: emacs: setup rust lsp utilities

2 files changed, 25 insertions, 5 deletions

diff --git a/infra/libkookie/overlays/kookie/emacs/rust/default.el b/infra/libkookie/overlays/kookie/emacs/rust/default.el
index 7be109575535..0dc40909d93e 100644
--- a/infra/libkookie/overlays/kookie/emacs/rust/default.el
+++ b/infra/libkookie/overlays/kookie/emacs/rust/default.el
@@ -1,10 +1,23 @@
-;;;
+;; rust.el
+;;   Configure rust development via lsp and rust-analyzer
+;;
+;; This mode enables IDE-like integration for writing and editing rust
+;; mode, as well as projectile.el, a utility to mark projects in a
+;; large set of directories such as a monorepo.  This mode depends on
+;; all projects in this tree following the projectile conventions.
+;;
+;;
+;; This file is part of LIBKOOKIE, a collection of nix expressions.
+;; LIBKOOKIE is licensed under the GPL-3.0 (or later) -- see LICENSE
 
 (provide 'rust)
 
-;; Use rust-analyzer for completions
+;;; Use rust-analyzer for completions
 (setq lsp-rust-server 'rust-analyzer)
 
-;; Start lsp mode for Rust buffers
+;;; Start lsp mode for Rust buffers
 (add-hook 'rust-mode-hook #'lsp)
 
+;;; Use projectile to find project roots
+(projectile-mode t)
+(setq lsp-auto-guess-root t)
diff --git a/infra/libkookie/overlays/kookie/emacs/rust/default.nix b/infra/libkookie/overlays/kookie/emacs/rust/default.nix
index bb5e5e5841fb..2c49caf06cbc 100644
--- a/infra/libkookie/overlays/kookie/emacs/rust/default.nix
+++ b/infra/libkookie/overlays/kookie/emacs/rust/default.nix
@@ -1,14 +1,21 @@
 { buildModule, epkgs, pkgs }:
 
+## TODO: move some of this stuff into a generic "ide" or "lsp" module!
 with epkgs; with pkgs;
 (buildModule "rust" ./. [
 
   # lsp integration
-  lsp-mode lsp-ui
+  lsp-mode lsp-ui company
 
+  # projectile mode
+  projectile
+  
   # real-time diagnostigs
-  flycheck
+  flycheck pkg-info epl
 
+  # Snippet support
+  yasnippet
+  
   # rust specifics
   rust-mode rust-analyzer
 ])