WIP Skip RBI regeneration after git operations

If the Ruby LSP was stopped shortly after the last git checkout/pull
operation, we don't need to regenerate RBIs since any Gemfile.lock
changes were likely from version control, not from bundle install

Author: alexcrocha

Gemfile

@@ -15,7 +15,7 @@ gem "irb"
 gem "rubocop-shopify"
 gem "rubocop-sorbet", ">= 0.4.1"
 gem "rubocop-rspec"
-gem "ruby-lsp", ">= 0.19.1"
+gem "ruby-lsp", ">= 0.19.1", git: "https://github.com/Shopify/ruby-lsp.git", branch: "ar/shutdown-timestamp"
 gem "ruby-lsp-rails", ">= 0.3.18"
 
 group :deployment, :development do

Gemfile.lock

@@ -1,3 +1,14 @@
+GIT
+  remote: https://github.com/Shopify/ruby-lsp.git
+  revision: 06602886c19cad7f44101b143bdbba9a5fc40a0d
+  branch: ar/shutdown-timestamp
+  specs:
+    ruby-lsp (0.21.4)
+      language_server-protocol (~> 3.17.0)
+      prism (>= 1.2, < 2.0)
+      rbs (>= 3, < 4)
+      sorbet-runtime (>= 0.5.10782)
+
 GIT
   remote: https://github.com/csfrancis/cityhash.git
   revision: 3cfc7d01f333c01811d5e834f1495eaa29f87c36
@@ -303,13 +314,8 @@ GEM
       rubocop (~> 1.51)
     rubocop-sorbet (0.8.6)
       rubocop (>= 1)
-    ruby-lsp (0.19.1)
-      language_server-protocol (~> 3.17.0)
-      prism (>= 1.1, < 2.0)
-      rbs (>= 3, < 4)
-      sorbet-runtime (>= 0.5.10782)
-    ruby-lsp-rails (0.3.18)
-      ruby-lsp (>= 0.19.0, < 0.20.0)
+    ruby-lsp-rails (0.3.25)
+      ruby-lsp (>= 0.21.2, < 0.22.0)
     ruby-progressbar (1.13.0)
     shopify-money (3.0.0)
     sidekiq (7.3.2)
@@ -394,7 +400,7 @@ DEPENDENCIES
   rubocop-rspec
   rubocop-shopify
   rubocop-sorbet (>= 0.4.1)
-  ruby-lsp (>= 0.19.1)
+  ruby-lsp (>= 0.19.1)!
   ruby-lsp-rails (>= 0.3.18)
   shopify-money
   sidekiq

lib/ruby_lsp/tapioca/addon.rb

@@ -47,7 +47,7 @@ def activate(global_state, outgoing_queue)
           outgoing_queue << Notification.window_log_message("Activating Tapioca add-on v#{version}")
           @rails_runner_client.register_server_addon(File.expand_path("server_addon.rb", __dir__))
 
-          check_gemfile_changes
+          handle_gemfile_changes
         rescue IncompatibleApiError
           # The requested version for the Rails add-on no longer matches. We need to upgrade and fix the breaking
           # changes
@@ -114,14 +114,25 @@ def workspace_did_change_watched_files(changes)
       private
 
       sig { void }
-      def check_gemfile_changes
-        gemfile_mtime = File.mtime("Gemfile")
-        lockfile_mtime = File.mtime("Gemfile.lock")
-
-        # If Gemfile is more recent than Gemfile.lock, bundle install hasn't been run yet
-        # If Gemfile.lock was modified less than 1 second after Gemfile, it's likely a version control system operation
-        return if gemfile_mtime > lockfile_mtime
-        return if (lockfile_mtime - gemfile_mtime) <= 1.0
+      def handle_gemfile_changes
+        return unless File.exist?(".git") && File.exist?(".ruby-lsp/shutdown-timestamp")
+
+        git_reflog_output = %x(git reflog --date=iso | grep -E "checkout|pull" | head -n 1).strip
+        return if git_reflog_output.empty?
+
+        timestamp_string = T.must(git_reflog_output.match(/\{(.*)\}/))[1]
+        last_git_operation_time = Time.iso8601(T.must(timestamp_string).sub(" ", "T").delete(" "))
+
+        return if last_git_operation_time.nil?
+
+        ruby_lsp_stop_time = Time.iso8601(File.read(".ruby-lsp/shutdown-timestamp"))
+
+        $stderr.puts("ruby_lsp_stop_time: #{ruby_lsp_stop_time}") # TODO: Remove
+        $stderr.puts("last_git_operation_time: #{last_git_operation_time}") # TODO: Remove
+
+        # If the Ruby LSP was stopped shortly after the last git checkout/pull operation, we don't need to regenerate
+        # RBIs since any Gemfile.lock changes were likely from version control, not from running bundle install
+        return if (ruby_lsp_stop_time - last_git_operation_time) <= 15.0
 
         current_lockfile = File.read("Gemfile.lock")
         snapshot_lockfile = File.read(GEMFILE_LOCK_SNAPSHOT) if File.exist?(GEMFILE_LOCK_SNAPSHOT)