# frozen_string_literal: true

describe Nanoc::CLI::StackTraceWriter do
  subject(:writer) do
    described_class.new(io)
  end

  let(:io) { StringIO.new }

  describe '#write' do
    subject { writer.write(exception, verbose: verbose) }

    let(:exception) do
      backtrace_generator = lambda do |af|
        if af.zero?
          raise 'finally!'
        else
          backtrace_generator.call(af - 1)
        end
      end

      begin
        backtrace_generator.call(3)
      rescue => e
        return e
      end
    end

    let(:verbose) { false }

    context 'verbose' do
      let(:verbose) { true }

      it 'starts with zero' do
        expect { subject }
          .to change(io, :string)
          .from('')
          .to(start_with('  0. '))
      end

      it 'has more recent stack frames at the top' do
        expect { subject }
          .to change(io, :string)
          .from('')
          .to(match(%r{^  0\. (C:)?/.+/spec/nanoc/cli/stack_trace_writer_spec\.rb:\d+.*$\n  1\. (C:)?/.+/spec/nanoc/cli/stack_trace_writer_spec\.rb:\d}m))
      end

      it 'has more than 10 stack frames' do
        expect { subject }
          .to change(io, :string)
          .from('')
          .to(match(%r{^  11\. }))
      end

      it 'does not contain a see-more explanation' do
        subject
        expect(io.string).not_to match(/crash\.log/)
      end
    end

    context 'not verbose' do
      let(:verbose) { false }

      it 'starts with zero' do
        expect { subject }
          .to change(io, :string)
          .from('')
          .to(start_with('  0. '))
      end

      it 'has more recent stack frames at the top' do
        expect { subject }
          .to change(io, :string)
          .from('')
          .to(match(%r{^  0\. (C:)?/.+/spec/nanoc/cli/stack_trace_writer_spec\.rb:\d+.*$\n  1\. (C:)?/.+/spec/nanoc/cli/stack_trace_writer_spec\.rb:\d}m))
      end

      it 'has not more than 10 stack frames' do
        subject
        expect(io.string).not_to match(/^  11\. /)
      end

      it 'does not contain a see-more explanation' do
        subject
        expect(io.string).to include(" lines omitted (see crash.log for details)\n")
      end
    end
  end
end
