Run subsidiary rscons binary from rscons() method if found - close #129

lib/rscons/script.rb

@@ -55,15 +55,19 @@ module Rscons
       # @param args[Array<String>]
       #   Arguments to pass to rscons subprocess.
       def rscons(path, *args)
-        me = File.expand_path($0)
+        rscons_path = File.expand_path($0)
         path = File.expand_path(path)
         if File.directory?(path)
-          command = [me, *args]
+          command = [*args]
           dir = path
         else
-          command = [me, "-f", path, *args]
+          command = ["-f", path, *args]
           dir = File.dirname(path)
         end
+        if File.exist?("#{dir}/rscons")
+          rscons_path = "#{dir}/rscons"
+        end
+        command = [rscons_path] + command
         print_dir = dir != "." && dir != File.expand_path(Dir.pwd)
         if ENV["specs"] and not ENV["dist_specs"] # specs
           command = ["ruby", $LOAD_PATH.map {|p| ["-I", p]}, command].flatten # specs

spec/build_tests_spec.rb

@@ -2694,6 +2694,32 @@ EOF
       end
     end
 
+    context "with a rscons binary in the subsidiary script directory" do
+      it "executes rscons from the subsidiary script directory" do
+        test_dir "subsidiary"
+
+        File.binwrite("sub/rscons", <<EOF)
+#!/usr/bin/env ruby
+puts "sub rscons"
+EOF
+        FileUtils.chmod(0755, "sub/rscons")
+        result = run_rscons(op: %W[configure])
+        expect(result.stderr).to eq ""
+        verify_lines(lines(result.stdout), [
+          %r{Entering directory '.*/sub'},
+          %r{sub rscons},
+          %r{Leaving directory '.*/sub'},
+          %r{Entering directory '.*/sub'},
+          %r{sub rscons},
+          %r{Leaving directory '.*/sub'},
+          %r{Entering directory '.*/sub'},
+          %r{sub rscons},
+          %r{Leaving directory '.*/sub'},
+          %r{top configure},
+        ])
+      end
+    end
+
     it "does not print entering/leaving directory messages when the subsidiary script is in the same directory" do
       test_dir "subsidiary"