Implemented!

Author: yasukotelin

.gitignore

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+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out

LICENSE

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+MIT License
+
+Copyright (c) 2019 yasukotelin
+
+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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+# git-diffs
+
+git-diffs is the git subcommand that is diff files selector.
+
+## Description
+
+You can use the `git-diffs` as a git subcommand like `git diffs`.<br>
+This shows diff file names and show diff when you select one.
+
+## Install
+
+```
+go get -u github.com/yasukotelin/git-diffs
+```
+
+## Usage
+
+```
+$ git diffs
+[1] .gitignore                      
+[2] LICENSE                         
+[3] README.md                       
+[4] git.go                          
+[5] go.mod                          
+[6] go.sum                          
+[7] main.go                         
+[8] test/sample.txt                 
+                                    
+Select number (empty is cancel) => 5
+```
+
+## Licence
+
+MIT
+
+## Author
+
+yasukotelin

git.go

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+package main
+
+import (
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func execDiffNameOnly() ([]string, error) {
+	// git add -N すると実際にはaddしていないがaddしたときと同じような結果が得られるようになる
+	// つまり、つぎにgit diffしたときに新規作成ファイルもdiff表示されるようになる
+	err := exec.Command("git", "add", "-N", "-A").Run()
+	if err != nil {
+		return nil, err
+	}
+
+	out, err := exec.Command("git", "diff", "--name-only").Output()
+	if err != nil {
+		return nil, err
+	}
+
+	files := strings.Split(string(out), "\n")
+
+	// 最後の空行は抜き出して返却
+	return files[0:len(files)-1], nil
+}
+
+func execDiff(path string) error {
+	cmd := exec.Command("git", "diff", path)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	return cmd.Run()
+}

go.mod

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+module github.com/yasukotelin/git-diffs
+
+go 1.13
+
+require github.com/urfave/cli v1.22.1

go.sum

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+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
+github.com/urfave/cli v1.22.1 h1:+mkCCcOFKPnCmVYVcURKps1Xe+3zP90gSYGNfRkjoIY=
+github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

main.go

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+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"errors"
+
+	"github.com/urfave/cli"
+)
+
+func main() {
+	app := cli.NewApp()
+	app.Name = "git-diffs"
+	app.Version = "0.1.0"
+	app.Description = "The git subcommand that is diff files selector."
+	app.Action = mainAction
+
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func mainAction(c *cli.Context) error {
+	files, err := execDiffNameOnly()
+	if err != nil {
+		return err
+	}
+
+	for i, f := range files {
+		fmt.Printf("[%d] %s\n", i+1, f)
+	}
+	fmt.Println()
+	fmt.Print("Select number (empty is cancel) => ")
+
+	var selNumStr string
+	fmt.Scanln(&selNumStr)
+
+	if selNumStr == "" {
+		return nil
+	}
+	selNum, err := strconv.Atoi(selNumStr)
+	if err != nil {
+		return errors.New("your input is not number.")
+	}
+	if selNum > len(files) || selNum < 1 {
+		return errors.New("your input is out of range numbers")
+	}
+	execDiff(files[selNum-1])
+
+	return nil
+}

test/sample.txt

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+AAA
+BBB
+CCC