Initial commit

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2017 Sahil Muthoo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# yamldiff
+
+A CLI tool to diff two YAML/JSON files.
+
+Nothing fancy about the code, all the heavy liftin' is done by:
+
+* [go-yaml](https://github.com/go-yaml/yaml/) - for YAML parsin'
+* [godebug](https://github.com/kylelemons/godebug/) - for diffin'
+* [aurora](https://github.com/logrusorgru/aurora) - for fancy printin'
+* [go-flags](https://github.com/jessevdk/go-flags) - for flaggin'
+* [The Go stdlib](https://golang.org/pkg/) - for everythin'
+
+Thanks to all the contributors of the above libraries.
+
+## Installation
+
+`go get -u github.com/sahilm/yamldiff`
+
+## Usage
+
+`yamldiff --yamlfile1 /path/to/yamlfile1.yml --yamlfile2 /path/to/yamlfile2.yml`
+
+## License
+
+The MIT License (MIT)
+
+Copyright (c) 2017 Sahil Muthoo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

main.go

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+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"strings"
+
+	"github.com/jessevdk/go-flags"
+	"github.com/kylelemons/godebug/pretty"
+	"github.com/logrusorgru/aurora"
+	"gopkg.in/yaml.v2"
+)
+
+func main() {
+	var opts struct {
+		Yamlfile1 string `long:"yamlfile1" description:"first YAML file" required:"true"`
+		Yamlfile2 string `long:"yamlfile2" description:"second YAML file" required:"true"`
+	}
+
+	_, err := flags.Parse(&opts)
+	if err != nil {
+		os.Exit(1)
+	}
+
+	errors := stat(opts.Yamlfile1, opts.Yamlfile2)
+	failOnErr(errors...)
+
+	yaml1, err := unmarshal(opts.Yamlfile1)
+	if err != nil {
+		failOnErr(err)
+	}
+	yaml2, err := unmarshal(opts.Yamlfile2)
+	if err != nil {
+		failOnErr(err)
+	}
+
+	diff := computeDiff(yaml1, yaml2)
+	if diff != "" {
+		fmt.Printf("%v\n%v\n", aurora.Bold("diff"), diff)
+	} else {
+		fmt.Println(aurora.Bold("no diff"))
+	}
+}
+
+func stat(filenames ...string) []error {
+	var errs []error
+	for _, filename := range filenames {
+		_, err := os.Stat(filename)
+		if err != nil {
+			errs = append(errs, fmt.Errorf("cannot find file: %v. Does it exist?", filename))
+		}
+	}
+	return errs
+}
+
+func unmarshal(filename string) (map[interface{}]interface{}, error) {
+	contents, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	var ret map[interface{}]interface{}
+	yaml.Unmarshal(contents, &ret)
+	return ret, nil
+}
+
+func failOnErr(errs ...error) {
+	if len(errs) > 0 {
+		var errMessages []string
+		for _, err := range errs {
+			errMessages = append(errMessages, err.Error())
+		}
+		fmt.Fprintf(os.Stderr, "%v\n\n", aurora.Red(strings.Join(errMessages, "\n")))
+		os.Exit(1)
+	}
+}
+
+func computeDiff(a interface{}, b interface{}) string {
+	var stringers []fmt.Stringer
+	for _, s := range strings.Split(pretty.Compare(a, b), "\n") {
+		switch {
+		case strings.HasPrefix(s, "+"):
+			stringers = append(stringers, aurora.Bold(aurora.Green(s)))
+		case strings.HasPrefix(s, "-"):
+			stringers = append(stringers, aurora.Bold(aurora.Red(s)))
+		}
+	}
+	var s []string
+	for _, stringer := range stringers {
+		s = append(s, stringer.String())
+	}
+	return strings.Join(s, "\n")
+}