Environment detection

This commit adds the environment package. It currently contains one
function that is used to determine whether or not the app is running in
CI.

For most popular CI products this assertion is made by including an
environment variable called `CI`.

IsCI checks for the existence of this environment variable. If it is
set to true then we return a boolean true.

internal/environment/environment.go

@@ -0,0 +1,11 @@
+// Package environment provides helper methods for working with the
+// current environment.
+package environment
+
+import "os"
+
+// IsCI returns true if the CI environment variable is set to true.
+// This is used for most CI systems.
+func IsCI() bool {
+	return os.Getenv("CI") == "true"
+}

internal/environment/environment_test.go

@@ -0,0 +1,17 @@
+package environment_test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/chelnak/gh-changelog/internal/environment"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsCIReturnsTrueWhenRunningInCI(t *testing.T) {
+	_ = os.Setenv("CI", "true")
+	defer func() {
+		_ = os.Unsetenv("CI")
+	}()
+	assert.True(t, environment.IsCI())
+}

internal/logging/logger.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 
 	"github.com/chelnak/gh-changelog/internal/configuration"
+	"github.com/chelnak/gh-changelog/internal/environment"
 )
 
 // LoggerType is an enum for the different types of logger
@@ -41,6 +42,12 @@ func NewLogger(loggerType LoggerType) Logger {
 func GetLoggerType(name string) (LoggerType, error) {
 	if name == "" {
 		name = configuration.Config.Logger
+
+		// If we're running in a CI environment then we don't want to
+		// use the spinner.
+		if environment.IsCI() {
+			name = "text"
+		}
 	}
 
 	var loggerType LoggerType