Show the package name associated with shard errors (#674)

Author: miry

spec/integration/install_spec.cr

@@ -855,7 +855,7 @@ describe "install" do
     with_shard(metadata) do
       ex = expect_raises(FailedCommand) { run "shards install --no-color" }
       ex.stdout.should contain <<-ERROR
-        E: Could not find executable "nonexistent"
+        E: Could not find executable "nonexistent" for "executable_missing"
         ERROR
     end
   end

src/cli.cr

@@ -176,12 +176,12 @@ end
 begin
   Shards.run
 rescue ex : OptionParser::InvalidOption
-  Shards::Log.fatal { ex.message }
+  Shards::Log.fatal(exception: ex) { ex.message }
   exit 1
 rescue ex : Shards::ParseError
   ex.to_s(STDERR)
   exit 1
 rescue ex : Shards::Error
-  Shards::Log.error { ex.message }
+  Shards::Log.error(exception: ex) { ex.message }
   exit 1
 end

src/package.cr

@@ -114,7 +114,7 @@ module Shards
       spec.executables.each do |name|
         exe_name = find_executable_file(Path[install_path], name)
         unless exe_name
-          raise Shards::Error.new("Could not find executable #{name.inspect}")
+          raise Shards::Error.new("Could not find executable #{name.inspect} for #{@name.inspect}")
         end
         Log.debug { "Install #{exe_name}" }
         source = File.join(install_path, exe_name)