Allow running against suspenders main

Co-authored-by: Steve Polito <[email protected]>

NEWS.md

@@ -2,6 +2,7 @@ Unreleased
 
 * Require `--skip-rubocop` in favor of our [linting configuration][]
 * Fixed: [Specify a tag when installing capybara_accessible_selectors](https://github.com/thoughtbot/suspenders/issues/1228)
+* Fixed: [Issue 1229: How do we want to handle un-released versions?](https://github.com/thoughtbot/suspenders/issues/1229)
 
 [linting configuration]: https://github.com/thoughtbot/suspenders/blob/main/FEATURES.md#linting
 

README.md

@@ -35,8 +35,21 @@ PostgreSQL][] as our database.
 
 We skip [RuboCop rules by default][] in favor of our [holistic linting rules][].
 
+#### Use the latest suspenders release:
+
+```
+rails new app_name \
+ --skip_rubocop \
+ --skip-test \
+ -d=postgresql \
+ -m=https://raw.githubusercontent.com/thoughtbot/suspenders/main/lib/install/web.rb
+```
+
+#### OR use the current (possibly unreleased) `main` branch of suspenders:
+
 ```
 rails new app_name \
+ --suspenders_main \
  --skip_rubocop \
  --skip-test \
  -d=postgresql \

lib/install/web.rb

@@ -24,8 +24,14 @@ def apply_template!
   end
   if options[:database] == "postgresql" && options[:skip_test] && options[:skip_rubocop]
     after_bundle do
-      gem_group :development, :test do
-        gem "suspenders"
+      if ARGV.include?("--suspenders_main")
+        gem_group :development, :test do
+          gem "suspenders", github: "thoughtbot/suspenders", branch: "main"
+        end
+      else
+        gem_group :development, :test do
+          gem "suspenders"
+        end
       end
 
       run "bundle install"
@@ -41,12 +47,22 @@ def apply_template!
 
       === Please use the correct options ===
 
+      # Use the latest suspenders release:
       rails new <app_name> \\
       --skip-rubocop \\
       --skip-test \\
       -d=postgresql \\
       -m=https://raw.githubusercontent.com/thoughtbot/suspenders/main/lib/install/web.rb
-    ERROR
+
+      # OR use the current (possibly unreleased) `main` branch of suspenders:
+      rails new <app_name> \\
+      --suspenders_main \\
+      --skip-rubocop \\
+      --skip-test \\
+      -d=postgresql \\
+      -m=https://raw.githubusercontent.com/thoughtbot/suspenders/main/lib/install/web.rb
+
+      ERROR
 
     fail Rails::Generators::Error, message
   end