podspec_documenter.rb in jazzy-0.9.5

- old
+ new

@@ -25,11 +25,11 @@
                              .select { |pt| pt.pod_name == podspec.root.name }
                              .map(&:label)
 
           targets.map do |t|
             args = %W[doc --module-name #{podspec.module_name} -- -target #{t}]
-            swift_version = (config.swift_version || '4')[0] + '.0'
+            swift_version = compiler_swift_version(config.swift_version)
             args << "SWIFT_VERSION=#{swift_version}"
             SourceKitten.run_sourcekitten(args)
           end
         end
         stdout.reduce([]) { |a, s| a + JSON.parse(s) }.to_json
@@ -94,9 +94,26 @@
       return unless rev = podspec.source[:tag] || podspec.source[:commit]
       "https://github.com/#{org}/#{repo}/blob/#{rev}"
     end
 
     private_class_method :github_file_prefix
+
+    # Latest valid value for SWIFT_VERSION.
+    LATEST_SWIFT_VERSION = '4.2'.freeze
+
+    # All valid values for SWIFT_VERSION that are longer
+    # than a major version number.  Ordered ascending.
+    LONG_SWIFT_VERSIONS = ['4.2'].freeze
+
+    # Go from a full Swift version like 4.2.1 to
+    # something valid for SWIFT_VERSION.
+    def compiler_swift_version(user_version)
+      return LATEST_SWIFT_VERSION unless user_version
+
+      LONG_SWIFT_VERSIONS.select do |version|
+        user_version.start_with?(version)
+      end.last || "#{user_version[0]}.0"
+    end
 
     # @!group SourceKitten output helper methods
 
     def pod_path
       if podspec.defined_in_file