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#Enumer
# Enumer
Enumer is a tool to generate Go code that adds useful methods to Go enums (constants with a specific type).
It started as a fork of [Rob Pike’s Stringer tool](https://godoc.org/golang.org/x/tools/cmd/stringer).
##Generated functions and methods
## Generated functions and methods
When Enumer is applied to a type, it will generate:
* A method `String()` that returns the string representation of the enum value. This makes the enum conform
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The generated code is exactly the same as the Stringer tool plus the mentioned additions, so you can use
**Enumer** where you are already using **Stringer** without any code change.
## Enum value string representation transformation
Stringer tool uses the same name for enum value string representation (usually CamelCase in Go).
```go
type MyType int
...
name := MyTypeValue.String() // name => "MyTypeValue"
```
Sometimes you need to use some other string representation format then CamelCase (i.e. in JSON).
To transform enum value string representation from CamelCase to snake_case or kebab-case `transform` flag could be used.
For example, for `enumer -type=MyType -json -transform=snake` command the next string representation will be generated:
```go
name := MyTypeValue.String() // name => "my_type_value"
```
## How to use
The usage of Enumer is the same as Stringer, so you can refer to the [Stringer docs](https://godoc.org/golang.org/x/tools/cmd/stringer)
for more information.
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the YAML related methods will be generated. And if the sql flag is set to true, the Scanner and Valuer interface will
be implemented to seamlessly use the enum in a database model.
For enum string representation transformation `transform` flag was added (i.e. `enumer -type=MyType -json -transform=snake`).
Possible values are `snake` and `kebab` for transformation to snake_case and kebab-case accordingly.
The default value for `transform` flag is `noop` which means no transformation will be performed.
## Inspiring projects
* [Stringer](https://godoc.org/golang.org/x/tools/cmd/stringer)
* [jsonenums](https://github.com/campoy/jsonenums)