Improve `ronn` activation

Previously having another gem with a `ronn` executable would silently
work and fail later with a cryptic error. Now we activate the proper
version, and give a proper error if it fails.

1 files changed, 14 insertions, 8 deletions

diff --git a/Rakefile b/Rakefile
index 530e1249f5..e5b318858e 100644
--- a/Rakefile
+++ b/Rakefile
@@ -227,10 +227,21 @@ task :rubocop do
   sh("bin/rubocop --parallel")
 end
 
-begin
-  require "ronn"
+namespace :man do
+  ronn_dep = bundler_spec.development_dependencies.find do |dep|
+    dep.name == "ronn"
+  end
+
+  ronn_requirement = ronn_dep.requirement.to_s
 
-  namespace :man do
+  begin
+    gem "ronn", ronn_requirement
+
+    require "ronn"
+  rescue LoadError
+    task(:require) { abort "We couln't activate ronn (#{ronn_requirement}). Try `gem install ronn:'#{ronn_requirement}'` to be able to release!" }
+    task(:build) { warn "We couln't activate ronn (#{ronn_requirement}). Try `gem install ronn:'#{ronn_requirement}'` to be able to build the help pages" }
+  else
     directory "man"
 
     index = []
@@ -284,11 +295,6 @@ begin
 
     task(:require) {}
   end
-rescue LoadError
-  namespace :man do
-    task(:require) { abort "Install the ronn gem to be able to release!" }
-    task(:build) { warn "Install the ronn gem to build the help pages" }
-  end
 end
 
 begin