feat(refacto): move everything in internal package

This allows to install katenary with `go install` and to clean up the
project folder.

internal/parser/main.go

@@ -0,0 +1,57 @@
+// Package parser is a wrapper around compose-go to parse compose files.
+package parser
+
+import (
+	"log"
+	"path/filepath"
+
+	"github.com/compose-spec/compose-go/cli"
+	"github.com/compose-spec/compose-go/types"
+)
+
+func init() {
+	// prepend compose.katenary.yaml to the list of default override file names
+	cli.DefaultOverrideFileNames = append([]string{
+		"compose.katenary.yml",
+		"compose.katenary.yaml",
+	}, cli.DefaultOverrideFileNames...)
+	// add podman-compose files
+	cli.DefaultOverrideFileNames = append(cli.DefaultOverrideFileNames,
+		[]string{
+			"podman-compose.katenary.yml",
+			"podman-compose.katenary.yaml",
+			"podman-compose.yml",
+			"podman-compose.yaml",
+		}...)
+}
+
+// Parse compose files and return a project. The project is parsed with dotenv, osenv and profiles.
+func Parse(profiles []string, envFiles []string, dockerComposeFile ...string) (*types.Project, error) {
+	if len(dockerComposeFile) == 0 {
+		cli.DefaultOverrideFileNames = append(cli.DefaultOverrideFileNames, dockerComposeFile...)
+	}
+
+	// resolve absolute paths of envFiles
+	for i := range envFiles {
+		var err error
+		envFiles[i], err = filepath.Abs(envFiles[i])
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	options, err := cli.NewProjectOptions(nil,
+		cli.WithProfiles(profiles),
+		cli.WithInterpolation(true),
+		cli.WithDefaultConfigPath,
+		cli.WithEnvFiles(envFiles...),
+		cli.WithOsEnv,
+		cli.WithDotEnv,
+		cli.WithNormalization(true),
+		cli.WithResolvedPaths(false),
+	)
+	if err != nil {
+		return nil, err
+	}
+	return cli.ProjectFromOptions(options)
+}