Move internal/core => internal/cli

internal/cli/params.go

@@ -0,0 +1,51 @@
+package cli
+
+import (
+	"context"
+	"os"
+	"os/signal"
+	"path/filepath"
+
+	"github.com/FAU-CDI/wisski-distillery/internal/bootstrap"
+	"github.com/FAU-CDI/wisski-distillery/pkg/environment"
+)
+
+// Params are used to initialize the excutable.
+type Params struct {
+	ConfigPath string          // ConfigPath is the path to the configuration file for the distillery
+	Context    context.Context // Context for the distillery
+}
+
+// ParamsFromEnv creates a new set of parameters from the environment.
+// Uses [ReadBaseDirectory] or falls back to [BaseDirectoryDefault].
+func ParamsFromEnv() (params Params, err error) {
+
+	// try to read the base directory!
+	value, err := ReadBaseDirectory(environment.Native{}) // TODO: Are we sure about the native environment here?
+	switch {
+	case environment.IsNotExist(err):
+		params.ConfigPath = bootstrap.BaseDirectoryDefault
+	case err == nil:
+		params.ConfigPath = value
+	default:
+		return params, err
+	}
+
+	// and add the configuration file name to it!
+	params.ConfigPath = filepath.Join(params.ConfigPath, bootstrap.ConfigFile)
+
+	// generate a new context
+	ctx, cancel := context.WithCancel(context.Background())
+	params.Context = ctx
+
+	// cancel the context on an interrupt
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt)
+	go func() {
+		<-c
+		cancel()
+	}()
+
+	// and return the params!
+	return params, nil
+}