update

Gemfile

@@ -1,7 +1,6 @@
 source "http://rubygems.org"
 gemspec
 
-gem "posix-spawn", :platforms => :ruby
 gem "redcarpet", :platforms => :ruby
 gem "kramdown", :platforms => :jruby
 gem "RedCloth"

HISTORY.md

@@ -3,6 +3,7 @@
 * Bump nokogiri from 1.8.1 to 1.16.5
 * Bump nokogiri-diff from 0.2.0 to 0.3.0
 * Bump rdoc from 3.6 to 6.7.0
+* Update CommandImplementation to better support large files (affecting RST and POD6 rendering)
 
 ## 4.0.2 - 2023-10-10
 * Add support for .mdx files in markdown

lib/github/markup/command_implementation.rb

@@ -1,9 +1,4 @@
-begin
-  require "posix-spawn"
-rescue LoadError
-  require "open3"
-end
-
+require "open3"
 require "github/markup/implementation"
 
 
@@ -39,28 +34,13 @@ def call_block(rendered, content)
         end
       end
 
-      if defined?(POSIX::Spawn)
-        def execute(command, target)
-          spawn = POSIX::Spawn::Child.new(*command, :input => target)
-          if spawn.status.success?
-            sanitize(spawn.out, target.encoding)
-          else
-            raise CommandError.new(spawn.err.strip)
-          end
-        end
-      else
-        def execute(command, target)
-          output = Open3.popen3(*command) do |stdin, stdout, stderr, wait_thr|
-            stdin.puts target
-            stdin.close
-            if wait_thr.value.success?
-              stdout.readlines
-            else
-              raise CommandError.new(stderr.readlines.join('').strip)
-            end
-          end
-          sanitize(output.join(''), target.encoding)
-        end
+      def execute(command, target)
+        # capture3 blocks until both buffers are written to and the process terminates, but
+        # it won't allow either buffer to fill up
+        stdout, stderr, status = Open3.capture3(*command, stdin_data: target)
+
+        raise CommandError.new(stderr) unless status.success?
+        sanitize(stdout, target.encoding)
       end
 
       def sanitize(input, encoding)

test/markup_test.rb

@@ -111,7 +111,7 @@ def test_raises_error_if_command_exits_non_zero
     begin
       GitHub::Markup.render('README.java', "stop swallowing errors", symlink: false)
     rescue GitHub::Markup::CommandError => e
-      assert_equal "failure message", e.message
+      assert_equal "failure message", e.message.strip
     else
       fail "an exception was expected but was not raised"
     end