CLI: do not error when non-YAML file present in directory

[nmiyake]

When running the CLI with a directory as input, it failed with the following:

➜  bin ./conjure compile inner-in/ out.json 
Exception in thread "main" unacceptable character '' (0x0) special characters are not allowed
in "'reader'", position 0
	at com.fasterxml.jackson.dataformat.yaml.snakeyaml.reader.StreamReader.checkPrintable(StreamReader.java:93)
	at com.fasterxml.jackson.dataformat.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:192)
	at com.fasterxml.jackson.dataformat.yaml.snakeyaml.reader.StreamReader.<init>(StreamReader.java:60)
	at com.fasterxml.jackson.dataformat.yaml.YAMLParser.<init>(YAMLParser.java:154)
	at com.fasterxml.jackson.dataformat.yaml.YAMLFactory._createParser(YAMLFactory.java:420)
	at com.fasterxml.jackson.dataformat.yaml.YAMLFactory.createParser(YAMLFactory.java:306)
	at com.fasterxml.jackson.dataformat.yaml.YAMLFactory.createParser(YAMLFactory.java:14)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2691)
	at com.palantir.conjure.parser.ConjureParser$RecursiveParser.parseInternal(ConjureParser.java:105)
	at com.palantir.conjure.parser.ConjureParser$RecursiveParser.parse(ConjureParser.java:90)
	at com.palantir.conjure.parser.ConjureParser.parse(ConjureParser.java:60)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
	at com.palantir.conjure.defs.Conjure.parse(Conjure.java:35)
	at com.palantir.conjure.cli.ConjureCli.generate(ConjureCli.java:61)
	at com.palantir.conjure.cli.ConjureCli.main(ConjureCli.java:40)

At first, it was not at all clear what was going on. After further investigation, I determined that the issue was that the directory contained a .DS_Store file:

➜  bin ls -la inner-in 
total 24
drwxr-xr-x  4 nmiyake  nmiyake   128 Aug 17 10:26 .
drwxr-xr-x@ 9 nmiyake  nmiyake   288 Aug 17 10:26 ..
-rw-r--r--@ 1 nmiyake  nmiyake  6148 Aug 17 10:26 .DS_Store
-rw-r--r--@ 1 nmiyake  nmiyake   252 Aug 17 10:24 in.conjure.yml
➜  bin rm inner-in/.DS_Store 
➜  bin ./conjure compile ./inner-in out.json

2 issues here:

• The failure message should include the path of the file that fails to parse
• When processing a directory, the CLI should either:
  • Only include YAML files in the directory (.yml)
  • Ignore invisible files