Comments (1)
It is not supported by design, but you can do it now by means of some little tricks.
The library can parse nested structures from environment string variables, but parsing a map of string slices is a tricky one.
The library was designed to parse simple types (not nested), so there is nothing like dynamic parsing (like JSON, etc.), so the library tries to define the type of the variable and then parse the string data into the variable according to the type.
In the case of a map of string slices, there is no way (for now) to specify the string slice with brackets or something, because the library expects to parse either slice (comma-separated list of strings, like a,b,c,d
) or map (comma-separated list of colon-separated key-value pairs, like a:b,c:d
).
When you want to parse a map of string slices, it is difficult to understand when the slice ends and next key-value pair begins (again, because there are no brackets or something now). But you may do a trick and redefine the map separator with another symbol. The library then will use the symbol to split the map into key-value pairs, and then will try to parse each value into a string slice using a default separator - a comma.
a:x,y;b:v,w
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Related Issues (20)
- Create a version compatibility policy
- Didn't skip unexported field HOT 4
- Apply Custom Value Setters to custom struct types
- Does this support parsing `map[string]CustomStruct` using the `env` tag? HOT 2
- How about adding the ability to use dynamic values in a config file? HOT 1
- What is the correct location for the config.yml? HOT 4
- Set but empty Environment Variables don't raise an error HOT 1
- Nested structures not sorted HOT 2
- [][]string from env HOT 1
- Setup env parameter for array in config? HOT 1
- Config returns nothing
- Update GetDescription to show which variables are required
- print the name of the env var in the error message when a required var is missing rather than just the struct field name HOT 1
- Allow reading from `fs.FS`
- Return wrapped error with "%w" verb instead of "%s"
- File decodes based on extension, meaning it fails to load config if `.rc` files are used
- env-required pretty limited usage
- Example of using map of structs in config, example of using `env-separator`
- It changes the set 0 to the default value.
- Can't read config file in Amazon EC2 server HOT 3
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