lang/rust: add bootstrap

modules/lang/rust/config.el

@@ -1,6 +1,6 @@
 ;;; module-rust.el
 
-(defvar +rust-cache-dir (concat doom-cache-dir "+rust/")
+(defvar +rust-ext-dir (concat doom-etc-dir "rust/")
   "TODO")
 
 (def-package! rust-mode
@@ -18,8 +18,8 @@
   :init
   (add-hook! rust-mode '(racer-mode eldoc-mode flycheck-rust-setup))
   :config
-  (setq racer-cmd (expand-file-name "racer/target/release/racer" +rust-cache-dir)
-        racer-rust-src-path (expand-file-name "rust/src/" +rust-cache-dir))
+  (setq racer-cmd (expand-file-name "racer/target/release/racer" +rust-ext-dir)
+        racer-rust-src-path (expand-file-name "rust/src/" +rust-ext-dir))
 
   ;; TODO Unit test keybinds
   (map! :map rust-mode-map :m "gd" 'racer-find-definition))

modules/lang/rust/packages.el

@@ -9,3 +9,33 @@
 
 (when (featurep! :completion company)
   (package! company-racer))
+
+;;
+(def-bootstrap! rust
+  (pcase (doom-system-os)
+    ('arch
+     (let (pkgs)
+       (unless (executable-find "rustc") (push "rust" pkgs))
+       (unless (executable-find "cargo") (push "cargo" pkgs))
+       (when pkgs
+         (sudo "pacman --noconfirm -S %s" (string-join pkgs " ")))))
+    ('debian) ;; TODO
+    ('macos
+     (unless (executable-find "rustc")
+       (sh "brew install rust"))))
+
+  (dolist (bin '("rustc" "cargo"))
+    (unless (executable-find bin)
+      (error "Failed to install %s" bin)))
+
+  (require! :lang rust t)
+  (require 'racer)
+  (and (unless (file-directory-p racer-rust-src-path)
+         (fetch :github "rust-lang/rust" (expand-file-name "rust" +rust-ext-dir))
+         t)
+       (unless (file-executable-p racer-cmd)
+         (let ((racer-dir (expand-file-name "racer" +rust-ext-dir)))
+           (fetch :github "phildawes/racer" racer-dir)
+           (let ((default-directory racer-dir))
+             (sh "cargo build --release"))
+           t))))