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package getenv_test
import (
"fmt"
"net"
"net/url"
"os"
"time"
"github.com/obalunenko/getenv"
"github.com/obalunenko/getenv/option"
)
func ExampleEnvOrDefault() {
const (
key = "GH_GETENV_TEST"
)
defer func() {
if err := os.Unsetenv(key); err != nil {
panic(err)
}
}()
var val any
// string
if err := os.Setenv(key, "golly"); err != nil {
panic(err)
}
val = getenv.EnvOrDefault(key, "golly")
fmt.Printf("[%T]: %v\n", val, val)
// int
if err := os.Setenv(key, "123"); err != nil {
panic(err)
}
val = getenv.EnvOrDefault(key, -99)
fmt.Printf("[%T]: %v\n", val, val)
// time.Time
if err := os.Setenv(key, "2022-01-20"); err != nil {
panic(err)
}
val = getenv.EnvOrDefault(key,
time.Date(1992, 12, 1, 0, 0, 0, 0, time.UTC),
option.WithTimeLayout("2006-01-02"),
)
fmt.Printf("[%T]: %v\n", val, val)
// []float64
if err := os.Setenv(key, "26.89,0.67"); err != nil {
panic(err)
}
val = getenv.EnvOrDefault(key, []float64{-99},
option.WithSeparator(","),
)
fmt.Printf("[%T]: %v\n", val, val)
// time.Duration
if err := os.Setenv(key, "2h35m"); err != nil {
panic(err)
}
val = getenv.EnvOrDefault(key, time.Second)
fmt.Printf("[%T]: %v\n", val, val)
// url.URL
if err := os.Setenv(key, "https://test:abcd123@golangbyexample.com:8000/tutorials/intro?type=advance&compact=false#history"); err != nil {
panic(err)
}
val = getenv.EnvOrDefault(key, url.URL{})
urlVal, ok := val.(url.URL)
if !ok {
panic("expected url.URL value")
}
fmt.Printf("[%T]: %s\n", urlVal, urlVal.String())
// net.IP
if err := os.Setenv(key, "2001:cb8::17"); err != nil {
panic(err)
}
val = getenv.EnvOrDefault(key, net.IP{})
fmt.Printf("[%T]: %v\n", val, val)
// []string
if err := os.Setenv(key, "a,b,c,d"); err != nil {
panic(err)
}
val = getenv.EnvOrDefault(key, []string{}, option.WithSeparator(","))
fmt.Printf("[%T]: %v\n", val, val)
// complex128
if err := os.Setenv(key, "1+2i"); err != nil {
panic(err)
}
val = getenv.EnvOrDefault(key, complex128(0))
fmt.Printf("[%T]: %v\n", val, val)
// []complex64
if err := os.Setenv(key, "1+2i,3+4i"); err != nil {
panic(err)
}
val = getenv.EnvOrDefault(key, []complex64{}, option.WithSeparator(","))
fmt.Printf("[%T]: %v\n", val, val)
// Output:
// [string]: golly
// [int]: 123
// [time.Time]: 2022-01-20 00:00:00 +0000 UTC
// [[]float64]: [26.89 0.67]
// [time.Duration]: 2h35m0s
// [url.URL]: https://test:abcd123@golangbyexample.com:8000/tutorials/intro?type=advance&compact=false#history
// [net.IP]: 2001:cb8::17
// [[]string]: [a b c d]
// [complex128]: (1+2i)
// [[]complex64]: [(1+2i) (3+4i)]
}
func ExampleEnv() {
const (
key = "GH_GETENV_TEST"
)
var (
val any
err error
)
defer func() {
if err = os.Unsetenv(key); err != nil {
panic(err)
}
}()
// string
if err = os.Setenv(key, "golly"); err != nil {
panic(err)
}
val, err = getenv.Env[string](key)
fmt.Printf("[%T]: %v; err: %v\n", val, val, err)
// int
if err = os.Setenv(key, "123"); err != nil {
panic(err)
}
val, err = getenv.Env[int](key)
fmt.Printf("[%T]: %v; err: %v\n", val, val, err)
// int conversion error
if err = os.Setenv(key, "123s4"); err != nil {
panic(err)
}
val, err = getenv.Env[int](key)
fmt.Printf("[%T]: %v; err: %v\n", val, val, err)
// time.Time
if err = os.Setenv(key, "2022-01-20"); err != nil {
panic(err)
}
val, err = getenv.Env[time.Time](key, option.WithTimeLayout("2006-01-02"))
fmt.Printf("[%T]: %v; err: %v\n", val, val, err)
// []float64
if err = os.Setenv(key, "26.89,0.67"); err != nil {
panic(err)
}
val, err = getenv.Env[[]float64](key, option.WithSeparator(","))
fmt.Printf("[%T]: %v; err: %v\n", val, val, err)
// time.Duration
if err = os.Setenv(key, "2h35m"); err != nil {
panic(err)
}
val, err = getenv.Env[time.Duration](key)
fmt.Printf("[%T]: %v; err: %v\n", val, val, err)
// url.URL
if err = os.Setenv(key, "https://test:abcd123@golangbyexample.com:8000/tutorials/intro?type=advance&compact=false#history"); err != nil {
panic(err)
}
val, err = getenv.Env[url.URL](key)
urlVal, ok := val.(url.URL)
if !ok {
panic("expected url.URL value")
}
fmt.Printf("[%T]: %s; err: %v\n", urlVal, urlVal.String(), err)
// net.IP
if err = os.Setenv(key, "2001:cb8::17"); err != nil {
panic(err)
}
val, err = getenv.Env[net.IP](key)
fmt.Printf("[%T]: %v; err: %v\n", val, val, err)
// []string
if err = os.Setenv(key, "a,b,c,d"); err != nil {
panic(err)
}
val, err = getenv.Env[[]string](key, option.WithSeparator(","))
fmt.Printf("[%T]: %v; err: %v\n", val, val, err)
// complex128
if err = os.Setenv(key, "1+2i"); err != nil {
panic(err)
}
val, err = getenv.Env[complex128](key)
fmt.Printf("[%T]: %v; err: %v\n", val, val, err)
// []complex64
if err = os.Setenv(key, "1+2i,3+4i"); err != nil {
panic(err)
}
val, err = getenv.Env[[]complex64](key, option.WithSeparator(","))
fmt.Printf("[%T]: %v; err: %v\n", val, val, err)
// Output:
// [string]: golly; err: <nil>
// [int]: 123; err: <nil>
// [int]: 0; err: failed to parse environment variable[GH_GETENV_TEST]: strconv.ParseInt: parsing "123s4": invalid syntax: invalid value
// [time.Time]: 2022-01-20 00:00:00 +0000 UTC; err: <nil>
// [[]float64]: [26.89 0.67]; err: <nil>
// [time.Duration]: 2h35m0s; err: <nil>
// [url.URL]: https://test:abcd123@golangbyexample.com:8000/tutorials/intro?type=advance&compact=false#history; err: <nil>
// [net.IP]: 2001:cb8::17; err: <nil>
// [[]string]: [a b c d]; err: <nil>
// [complex128]: (1+2i); err: <nil>
// [[]complex64]: [(1+2i) (3+4i)]; err: <nil>
}