package main

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"

	"github.com/logrusorgru/aurora"
)

// goVet executes "go vet" recursively for each module in the git repo. As of
// go 1.13, "go vet ./..." is required to recurse but does not straddle
// module boundaries. It must be run in a valid package directory. It is
// significantly faster than running individual "go vet ." in each dir.
func goVet() error {
	return filepath.Walk(".", goVetW)
}

func goVetW(path string, info os.FileInfo, err error) error {
	switch {
	case err != nil:
		return err
	case info.Mode().IsDir() && strings.HasPrefix(info.Name(), "."):
		return filepath.SkipDir
	case info.Mode().IsRegular() && info.Name() == "go.mod":
		dir := filepath.Dir(path)
		Info(" running %q in %s", aurora.Blue("go vet"), aurora.Green(dir))
		cmd := exec.Command("go", "vet", "./...")
		cmd.Dir = path
		op, err := cmd.CombinedOutput()
		switch {
		case len(op) > 0 && err != nil:
			return fmt.Errorf("go vet failed: %s\n%s\n", aurora.Red(err), op)
		case len(op) > 0:
			return fmt.Errorf("%s:\n%s\n", aurora.Red("go vet reports"), op)
		case err != nil:
			return err
		}
	}
	return nil
}