Reports complex nested if statements in Go code, by calculating its complexities based on the rules defined by the [Cognitive Complexity white paper by G. Ann Campbell](https://www.sonarsource.com/docs/CognitiveComplexity.pdf).
-e, --exclude-dirs strings regexps of directories to be excluded for checking; comma-separated list
--json emit json format
--min int minimum complexity to show (default 1)
--top int show only the top N most complex if statements (default 10)
-v, --verbose verbose output
```
### Example
Let's say you write:
```go
package main
func _() {
if foo {
if bar {
}
}
if baz == "baz" {
if qux {
if quux {
}
}
}
}
```
And give it to nestif:
```console
$ nestif foo.go
foo.go:9:2: `if baz == "baz"` is nested (complexity: 3)
foo.go:4:2: `if foo` is nested (complexity: 1)
```
Note that the results are sorted in descending order of complexity. In addition, it shows only the top 10 most complex if statements by default, and you can specify how many to show with `-top` flag.
### Rules
It calculates the complexities of if statements according to the nesting rules of Cognitive Complexity.
Since the more deeply-nested your code gets, the harder it can be to reason about, it assesses a nesting increment for it:
```go
if condition1 {
if condition2 { // +1
if condition3 { // +2
if condition4 { // +3
}
}
}
}
```
`else` and `else if` increase complexity by one wherever they are because the mental cost has already been paid when reading the if:
Please see the [Cognitive Complexity: A new way of measuring understandability](https://www.sonarsource.com/docs/CognitiveComplexity.pdf) white paper by G. Ann Campbell for more detail on Cognitive Complexity.
