added config discovery & support for relative dir

Author: roboslone

cmd/fexec/main.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"path/filepath"
 	"strings"
 	"time"
 
@@ -14,6 +15,17 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
+const (
+	discoverMaxDepth = 7
+)
+
+var (
+	discoverNames = []string{
+		".fexec.yaml",
+		".fexec.yml",
+	}
+)
+
 type CommandConfig struct {
 	Commands map[string]framework.CommandModule[any] `yaml:"commands"`
 }
@@ -45,14 +57,25 @@ func (cfg *CommandConfig) PrintUsage() {
 func main() {
 	fs := flag.NewFlagSet("fexec", flag.ContinueOnError)
 
-	configPath := fs.String("c", ".fexec.yaml", "Path to config file")
+	wd := "."
+	configPath := fs.String("c", "", "Path to config file")
 
 	flagErr := fs.Parse(os.Args[1:])
 	printUsage := errors.Is(flagErr, flag.ErrHelp) || len(os.Args) == 1
 	if !printUsage && flagErr != nil {
 		log.Fatalf("parsing options: %s", flagErr)
 	}
 
+	if *configPath == "" {
+		var err error
+		*configPath, err = DiscoverConfigPath()
+		if err != nil {
+			log.Fatalf("discovering config path: %s", err)
+		}
+
+		wd = filepath.Dir(*configPath)
+	}
+
 	cfg, err := ParseConfig(*configPath)
 	if err != nil {
 		log.Fatalf("reading config: %s", err)
@@ -78,6 +101,12 @@ func main() {
 			continue
 		}
 
+		if module.Dir == "" {
+			module.Dir = wd
+		} else if !filepath.IsAbs(module.Dir) {
+			module.Dir = filepath.Join(wd, module.Dir)
+		}
+
 		modules[name] = &framework.CommandModule[any]{
 			Command:   module.Command,
 			Dir:       module.Dir,
@@ -113,3 +142,26 @@ func SetupCommonEnv() error {
 	}
 	return nil
 }
+
+func DiscoverConfigPath() (string, error) {
+	wd, err := os.Getwd()
+	if err != nil {
+		return "", fmt.Errorf("getwd: %w", err)
+	}
+
+	for depth := 0; depth < discoverMaxDepth; depth++ {
+		for _, name := range discoverNames {
+			path := fmt.Sprintf("%s/%s", wd, name)
+
+			if _, err = os.Stat(path); err == nil {
+				return path, nil
+			}
+			if !errors.Is(err, os.ErrNotExist) {
+				return "", fmt.Errorf("stat %q: %w", path, err)
+			}
+		}
+		wd = filepath.Dir(wd)
+	}
+
+	return "", fmt.Errorf("file not found (searched for %s)", strings.Join(discoverNames, ", "))
+}