name set in yaml is equivalent to --project-name

Signed-off-by: Nicolas De Loof <[email protected]>

cli/options.go

@@ -26,6 +26,7 @@ import (
 	"strings"
 
 	"github.com/sirupsen/logrus"
+	"gopkg.in/yaml.v3"
 
 	"github.com/compose-spec/compose-go/v2/consts"
 	"github.com/compose-spec/compose-go/v2/dotenv"
@@ -482,6 +483,20 @@ func (o *ProjectOptions) prepare(ctx context.Context) (*types.ConfigDetails, err
 		return configDetails, err
 	}
 
+	if o.Name == "" {
+		type named struct {
+			Name string `yaml:"name,omitempty"`
+		}
+		// if any of the compose file is named, this is equivalent to user passing --project-name
+		for _, cfg := range configDetails.ConfigFiles {
+			var n named
+			yaml.Unmarshal(cfg.Content, &n)
+			if n.Name != "" {
+				o.Name = n.Name
+			}
+		}
+	}
+
 	o.loadOptions = append(o.loadOptions,
 		withNamePrecedenceLoad(defaultDir, o),
 		withConvertWindowsPaths(o),