• There are 28 files with units, with 1,749 lines of code.
• 0 very complex files (McCabe index sum 251+; 0 lines of code)
• 0 complex files (McCabe index sum 126-250; 0 lines of code)
• 0 medium complex files (McCabe index sum 51-125; 0 lines of code)
• 2 slightly complex files (McCabe index sum 26-50; 501 lines of code)
• 26 simple files (McCabe index sum 1-25; 1,248 lines of code)
• 10 main files have no units (e.g. languages without unit analysis, or files without functions) and are not classified.

The McCabe index of a file grows with its size: per 100 lines tells a large but plain file from a dense one, and most complex unit whether the complexity sits in one unit or is spread over many.

File	# lines	# units	McCabe index (sum)	per 100 lines	most complex unit
Impl.scala in src/main/scala/com/gu/invoicing/preview	276	10	39	14	11
Impl.scala in src/main/scala/com/gu/invoicing/refund	225	12	28	12	8
Impl.scala in src/main/scala/com/gu/invoicing/invoice	147	10	13	9	3
Program.scala in src/main/scala/com/gu/invoicing/refund	100	1	10	10	10
Model.scala in src/main/scala/com/gu/invoicing/invoice	151	2	8	5	7
Retry.scala in src/main/scala/com/gu/invoicing/common	18	2	7	39	4
Impl.scala in src/main/scala/com/gu/invoicing/refundErroneousPayment	102	5	6	6	2
Model.scala in src/main/scala/com/gu/invoicing/preview	102	1	6	6	6
Program.scala in src/main/scala/com/gu/invoicing/refundErroneousPayment	38	2	4	11	3
HttpHelper.scala in src/main/scala/com/gu/invoicing/common	29	4	4	14	1
Impl.scala in src/main/scala/com/gu/invoicing/nextinvoicedate	56	3	3	5	1
Cli.scala in src/main/scala/com/gu/invoicing/preview	19	1	2	11	2
Model.scala in src/main/scala/com/gu/invoicing/refund	182	1	2	1	2
Program.scala in src/main/scala/com/gu/invoicing/invoice	29	2	2	7	1
Lambda.scala in src/main/scala/com/gu/invoicing/refundErroneousPayment	23	1	1	4	1
Lambda.scala in src/main/scala/com/gu/invoicing/pdf	23	1	1	4	1
Model.scala in src/main/scala/com/gu/invoicing/pdf	46	1	1	2	1
Program.scala in src/main/scala/com/gu/invoicing/pdf	17	1	1	6	1
Cli.scala in src/main/scala/com/gu/invoicing/pdf	12	1	1	8	1
Lambda.scala in src/main/scala/com/gu/invoicing/preview	16	1	1	6	1
Program.scala in src/main/scala/com/gu/invoicing/preview	26	1	1	4	1
Lambda.scala in src/main/scala/com/gu/invoicing/refund	17	1	1	6	1
Cli.scala in src/main/scala/com/gu/invoicing/refund	17	1	1	6	1
Lambda.scala in src/main/scala/com/gu/invoicing/nextinvoicedate	16	1	1	6	1
Program.scala in src/main/scala/com/gu/invoicing/nextinvoicedate	15	1	1	7	1
Cli.scala in src/main/scala/com/gu/invoicing/nextinvoicedate	11	1	1	9	1
Lambda.scala in src/main/scala/com/gu/invoicing/invoice	20	1	1	5	1
Cli.scala in src/main/scala/com/gu/invoicing/invoice	16	1	1	6	1

• File complexity is the sum of the McCabe indexes (conditional complexity) of the units (methods, functions...) in a file.
• Files are classified in five categories based on that sum: 1-25 (simple files), 26-50 (slightly complex files), 51-125 (medium complex files), 126-250 (complex files), 251+ (very complex files). The default bands are five times the unit complexity bands, as a file is a group of units.
• Only main code files with units are classified. Files without units (languages without unit analysis, or files without functions) have no complexity to measure and are left out rather than counted as simple.
• A very complex file holds many decisions, which often means it has too many responsibilities: a candidate to split, and a place where changes need more testing.