dev-cmd/generate-*-api: be a bit safer.

- also try generating formula API on macOS
- pull more logic out of `unless args.dry_run?` in case it fails

.github/workflows/tests.yml

@@ -167,7 +167,7 @@ jobs:
         id: set-up-homebrew
         uses: Homebrew/actions/setup-homebrew@master
         with:
-          core: false
+          core: true
           cask: true
           test-bot: false
 
@@ -195,6 +195,9 @@ jobs:
           brew audit --skip-style --except=version --tap=homebrew/cask-fonts
           brew audit --skip-style --except=version --tap=homebrew/cask-versions
 
+      - name: Generate formula API
+        run: brew generate-formula-api --dry-run
+
       - name: Generate cask API
         run: brew generate-cask-api --dry-run
 

Library/Homebrew/dev-cmd/generate-cask-api.rb

@@ -52,7 +52,8 @@ module Homebrew
     end
 
     Homebrew.with_no_api_env do
-      File.write("api/cask_tap_migrations.json", JSON.dump(tap.tap_migrations)) unless args.dry_run?
+      tap_migrations_json = JSON.dump(tap.tap_migrations)
+      File.write("api/cask_tap_migrations.json", tap_migrations_json) unless args.dry_run?
 
       Cask::Cask.generating_hash!
 
@@ -60,12 +61,14 @@ module Homebrew
         cask = Cask::CaskLoader.load(path)
         name = cask.token
         json = JSON.pretty_generate(cask.to_hash_with_variations)
+        cask_source = path.read
+        html_template_name = html_template(name)
 
         unless args.dry_run?
           File.write("_data/cask/#{name}.json", "#{json}\n")
           File.write("api/cask/#{name}.json", CASK_JSON_TEMPLATE)
-          File.write("api/cask-source/#{name}.rb", path.read)
-          File.write("cask/#{name}.html", html_template(name))
+          File.write("api/cask-source/#{name}.rb", cask_source)
+          File.write("cask/#{name}.html", html_template_name)
         end
       rescue
         onoe "Error while generating data for cask '#{path.stem}'."

Library/Homebrew/dev-cmd/generate-formula-api.rb

@@ -53,7 +53,8 @@ module Homebrew
     end
 
     Homebrew.with_no_api_env do
-      File.write("api/formula_tap_migrations.json", JSON.dump(tap.tap_migrations)) unless args.dry_run?
+      tap_migrations_json = JSON.dump(tap.tap_migrations)
+      File.write("api/formula_tap_migrations.json", tap_migrations_json) unless args.dry_run?
 
       Formulary.enable_factory_cache!
       Formula.generating_hash!
@@ -62,11 +63,12 @@ module Homebrew
         formula = Formulary.factory(name)
         name = formula.name
         json = JSON.pretty_generate(formula.to_hash_with_variations)
+        html_template_name = html_template(name)
 
         unless args.dry_run?
           File.write("_data/formula/#{name.tr("+", "_")}.json", "#{json}\n")
           File.write("api/formula/#{name}.json", FORMULA_JSON_TEMPLATE)
-          File.write("formula/#{name}.html", html_template(name))
+          File.write("formula/#{name}.html", html_template_name)
         end
       rescue
         onoe "Error while generating data for formula '#{name}'."