yazgazan/jaydiff

package main

import (
    "fmt"
    "os"

    "github.com/jessevdk/go-flags"
    "github.com/yazgazan/jaydiff/diff"
    "golang.org/x/crypto/ssh/terminal"
)

type files struct {
    LHS string `positional-arg-name:"FILE_1"`
    RHS string `positional-arg-name:"FILE_2"`
}

type config struct {
    Files  files          `positional-args:"yes" required:"yes"`
    Ignore ignorePatterns `long:"ignore" short:"i" description:"paths to ignore (glob)"`
    output
    IgnoreExcess  bool `long:"ignore-excess" description:"ignore excess keys and array elements"`
    IgnoreValues  bool `long:"ignore-values" description:"ignore scalar's values (only type is compared)"`
    OutputReport  bool `long:"report" short:"r" description:"output report format"`
    UseSliceMyers bool `long:"slice-myers" description:"use myers algorithm for slices"`

    Stream             bool `long:"stream" description:"treat FILE_1 and FILE_2 as JSON streams"`
    StreamLines        bool `long:"stream-lines" description:"read JSON stream line by line (expecting 1 JSON value per line)"`
    StreamIgnoreExcess bool `long:"stream-ignore-excess" description:"ignore excess values in JSON stream"`
    StreamValidate     bool `long:"stream-validate" description:"compare FILE_2 JSON stream against FILE_1 single value"`

    Version func() `long:"version" short:"v" description:"print release version"`
}

type output struct {
    Indent     string `long:"indent" description:"indent string" default:"\t"`
    ShowTypes  bool   `long:"show-types" short:"t" description:"show types"`
    Colorized  bool
    JSON       bool `long:"json" description:"json-style output"`
    JSONValues bool
}

func readConfig() config {
    var c config
    c.Version = func() {
        fmt.Fprintf(os.Stderr, "%s\n", Version)
        os.Exit(0)
    }

    _, err := flags.Parse(&c)
    if err != nil {
        if flagsErr, ok := err.(*flags.Error); ok && flagsErr.Type == flags.ErrHelp {
            os.Exit(0)
        }
        fmt.Fprintf(os.Stderr, "Failed to parse arguments. See %s --help\n", os.Args[0])
        os.Exit(statusUsage)
    }

    if c.JSON && c.ShowTypes {
        fmt.Fprintf(os.Stderr, "Incompatible options --json and --show-types\n")
        os.Exit(statusUsage)
    }

    c.InferFlags()

    return c
}

func (c *config) InferFlags() {
    if c.JSON {
        c.JSONValues = true
    }
    if c.JSON && c.OutputReport {
        c.JSON = false
    }
    if c.StreamLines || c.StreamValidate {
        c.Stream = true
    }

    c.output.Colorized = terminal.IsTerminal(int(os.Stdout.Fd()))
}

func (c config) Opts() []diff.ConfigOpt {
    opts := []diff.ConfigOpt{}

    if c.UseSliceMyers {
        opts = append(opts, diff.UseSliceMyers())
    }

    return opts
}