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package cmd
import (
"bytes"
"errors"
"flag"
"fmt"
"io/ioutil"
"os/exec"
)
var update = flag.Bool("update", false, "update .golden files")
func init() {
// Mute commands.
addCmd.SetOutput(new(bytes.Buffer))
initCmd.SetOutput(new(bytes.Buffer))
}
// compareFiles compares the content of files with pathA and pathB.
// If contents are equal, it returns nil.
// If not, it returns which files are not equal
// and diff (if system has diff command) between these files.
func compareFiles(pathA, pathB string) error {
contentA, err := ioutil.ReadFile(pathA)
if err != nil {
return err
}
contentB, err := ioutil.ReadFile(pathB)
if err != nil {
return err
}
if !bytes.Equal(contentA, contentB) {
output := new(bytes.Buffer)
output.WriteString(fmt.Sprintf("%q and %q are not equal!\n\n", pathA, pathB))
diffPath, err := exec.LookPath("diff")
if err != nil {
// Don't execute diff if it can't be found.
return nil
}
diffCmd := exec.Command(diffPath, "-u", pathA, pathB)
diffCmd.Stdout = output
diffCmd.Stderr = output
output.WriteString("$ diff -u " + pathA + " " + pathB + "\n")
if err := diffCmd.Run(); err != nil {
output.WriteString("\n" + err.Error())
}
return errors.New(output.String())
}
return nil
}
// checkLackFiles checks if all elements of expected are in got.
func checkLackFiles(expected, got []string) error {
lacks := make([]string, 0, len(expected))
for _, ev := range expected {
if !stringInStringSlice(ev, got) {
lacks = append(lacks, ev)
}
}
if len(lacks) > 0 {
return fmt.Errorf("Lack %v file(s): %v", len(lacks), lacks)
}
return nil
}
// stringInStringSlice checks if s is an element of slice.
func stringInStringSlice(s string, slice []string) bool {
for _, v := range slice {
if s == v {
return true
}
}
return false
}
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