ARM-software/golang-utils

package environment

import (
    "os"
    "os/user"

    "github.com/joho/godotenv"

    "github.com/ARM-software/golang-utils/utils/filesystem"
    "github.com/ARM-software/golang-utils/utils/platform"
)

type currentEnv struct {
}

func (c *currentEnv) GetCurrentUser() (currentUser *user.User) {
    currentUser, _ = platform.GetCurrentUser()
    return
}

// GetEnvironmentVariables returns the current environment variable (and optionally those in the supplied in `dotEnvFiles`)
// `dotEnvFiles` corresponds to `.env` files present on the machine and follows the mechanism described by https://github.com/bkeepers/dotenv
func (c *currentEnv) GetEnvironmentVariables(dotEnvFiles ...string) (variables []IEnvironmentVariable) {
    if len(dotEnvFiles) > 0 { // if no args, then it will attempt to load .env
        _ = godotenv.Load(dotEnvFiles...) // ignore error (specifically on loading .env) consistent with config.LoadFromEnvironment
    }

    variables = ParseEnvironmentVariables(os.Environ()...)
    return
}

func (c *currentEnv) GetExpandedEnvironmentVariables(dotEnvFiles ...string) []IEnvironmentVariable {
    return ExpandEnvironmentVariables(true, c.GetEnvironmentVariables(dotEnvFiles...)...)
}

func (c *currentEnv) GetFilesystem() filesystem.FS {
    return filesystem.NewStandardFileSystem()
}

// GetEnvironmentVariable searches the current environment (and optionally dotEnvFiles) for a specific environment variable `envvar`.
func (c *currentEnv) GetEnvironmentVariable(envvar string, dotEnvFiles ...string) (value IEnvironmentVariable, err error) {
    return FindEnvironmentVariable(envvar, c.GetEnvironmentVariables(dotEnvFiles...)...)
}

func (c *currentEnv) GetExpandedEnvironmentVariable(envvar string, dotEnvFiles ...string) (value IEnvironmentVariable, err error) {
    currentEnvvars := c.GetEnvironmentVariables(dotEnvFiles...)
    value, err = FindEnvironmentVariable(envvar, currentEnvvars...)
    if err != nil {
        return
    }
    value = ExpandEnvironmentVariable(true, value, currentEnvvars...)
    return
}

// NewCurrentEnvironment returns system current environment.
func NewCurrentEnvironment() IEnvironment {
    return &currentEnv{}
}