Implement bootstrap functionality + make bootstrap (WIP)

modules/lang/go/packages.el

@@ -8,3 +8,29 @@
 
 (when (featurep! :completion company)
   (package! company-go))
+
+;;
+(def-bootstrap! go
+  (let ((gobin  (executable-find "go"))
+        (gopath (getenv "GOPATH"))
+        changed)
+    (unless gobin
+      (pcase (doom-system-os)
+        ('arch
+         (sudo "pacman --noconfirm -S go"))
+        ('debian) ;; TODO
+        ('macos
+         (sh "brew install go")))
+      (unless (executable-find "go")
+        (error "Go isn't installed (%s)" gobin)))
+    (unless (file-directory-p gopath)
+      (error "GOPATH isn't set up (%s)" gopath))
+    (mapc (lambda (url)
+          (unless (file-directory-p (expand-file-name (concat "src/" url) gopath))
+            (sh "%s get -u '%s'" gobin url)
+            (setq changed t)))
+        '("github.com/nsf/gocode"
+          "github.com/motemen/gore"
+          "golang.org/x/tools/cmd/guru"
+          "golang.org/x/tools/cmd/gorename"))
+    (or changed (not gobin))))