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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"github.com/urfave/cli"
diff "github.com/yudai/gojsondiff"
"github.com/yudai/gojsondiff/formatter"
)
func main() {
app := cli.NewApp()
app.Name = "jd"
app.Usage = "JSON Diff"
app.Version = "0.0.2"
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "format, f",
Value: "ascii",
Usage: "Diff Output Format (ascii, delta)",
EnvVar: "DIFF_FORMAT",
},
cli.BoolFlag{
Name: "coloring, c",
Usage: "Enable coloring in the ASCII mode (not available in the delta mode)",
EnvVar: "COLORING",
},
cli.BoolFlag{
Name: "quiet, q",
Usage: "Suppress output, if no differences are found",
EnvVar: "QUIET",
},
}
app.Action = func(c *cli.Context) error {
if len(c.Args()) < 2 {
fmt.Println("Not enough arguments.\n")
fmt.Printf("Usage: %s json_file another_json_file\n", app.Name)
os.Exit(1)
}
aFilePath := c.Args()[0]
bFilePath := c.Args()[1]
// Prepare your JSON string as `[]byte`, not `string`
aString, err := ioutil.ReadFile(aFilePath)
if err != nil {
fmt.Printf("Failed to open file '%s': %s\n", aFilePath, err.Error())
os.Exit(2)
}
// Another JSON string
bString, err := ioutil.ReadFile(bFilePath)
if err != nil {
fmt.Printf("Failed to open file '%s': %s\n", bFilePath, err.Error())
os.Exit(2)
}
// Then, compare them
differ := diff.New()
d, err := differ.Compare(aString, bString)
if err != nil {
fmt.Printf("Failed to unmarshal file: %s\n", err.Error())
os.Exit(3)
}
// Output the result
if d.Modified() || !c.Bool("quiet") {
format := c.String("format")
var diffString string
if format == "ascii" {
var aJson map[string]interface{}
json.Unmarshal(aString, &aJson)
config := formatter.AsciiFormatterConfig{
ShowArrayIndex: true,
Coloring: c.Bool("coloring"),
}
formatter := formatter.NewAsciiFormatter(aJson, config)
diffString, err = formatter.Format(d)
if err != nil {
// No error can occur
}
} else if format == "delta" {
formatter := formatter.NewDeltaFormatter()
diffString, err = formatter.Format(d)
if err != nil {
// No error can occur
}
} else {
fmt.Printf("Unknown Foramt %s\n", format)
os.Exit(4)
}
fmt.Print(diffString)
return cli.NewExitError("", 1)
}
return nil
}
app.Run(os.Args)
}
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