lint.rb in travis-1.8.14.travis.1162.9

- old
+ new

@@ -1,6 +1,7 @@
 require 'travis/cli'
+require 'yaml'
 
 module Travis
   module CLI
     class Lint < ApiCommand
       description 'display warnings for a .travis.yml'
@@ -17,9 +18,15 @@
           content = File.read(file)
         else
           debug "reading stdin"
           file    = 'STDIN'
           content = $stdin.read
+        end
+
+        begin
+          YAML.load(content)
+        rescue Psych::SyntaxError => e
+          error "#{file} is not valid YAML: #{e.message}"
         end
 
         lint = session.lint(content)
 
         unless quiet?