use jrsonnet if available

Author: sorah

gen-k8s.rb

@@ -3,6 +3,9 @@
 require 'json'
 require 'tmpdir'
 
+
+jsonnet = system('jrsonnet', '--help', out: File::NULL, err: [:child, :out]) ? 'jrsonnet' : 'jsonnet'
+
 Dir.chdir(__dir__)
 tmpdir = Dir.mktmpdir
 
@@ -12,7 +15,7 @@
   FileUtils.mkdir_p File.dirname(dst)
 
   File.open(dst, 'w') do |io|
-    system('jsonnet', src, out: io, exception: true)
+    system(jsonnet, src, out: io, exception: true)
   end
 
   out = JSON.parse(File.read(dst))

tf/jsonnet.rb

@@ -20,6 +20,7 @@
 require 'json'
 require 'tempfile'
 
+jsonnet = system('jrsonnet', '--help', out: File::NULL, err: [:child, :out]) ? 'jrsonnet' : 'jsonnet'
 query = JSON.load($stdin)
 
 Tempfile.open do |output|
@@ -28,12 +29,12 @@
   end
 
   if path = query['path']
-    exit $?.to_i unless system('jsonnet', *tla, path, out: output)
+    exit $?.to_i unless system(jsonnet, *tla, path, out: output)
   else
     Tempfile.open do |input|
       input.write(query.fetch('input'))
 
-      exit $?.to_i unless system('jsonnet', *tla, '-', in: input.tap(&:rewind), out: output)
+      exit $?.to_i unless system(jsonnet, *tla, '-', in: input.tap(&:rewind), out: output)
     end
   end