initial commit

.gitignore

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+
+# Created by https://www.gitignore.io/api/go,emacs,macos
+
+### Emacs ###
+# -*- mode: gitignore; -*-
+*~
+\#*\#
+/.emacs.desktop
+/.emacs.desktop.lock
+*.elc
+auto-save-list
+tramp
+.\#*
+
+# Org-mode
+.org-id-locations
+*_archive
+
+# flymake-mode
+*_flymake.*
+
+# eshell files
+/eshell/history
+/eshell/lastdir
+
+# elpa packages
+/elpa/
+
+# reftex files
+*.rel
+
+# AUCTeX auto folder
+/auto/
+
+# cask packages
+.cask/
+dist/
+
+# Flycheck
+flycheck_*.el
+
+# server auth directory
+/server/
+
+# projectiles files
+.projectile
+projectile-bookmarks.eld
+
+# directory configuration
+.dir-locals.el
+
+# saveplace
+places
+
+# url cache
+url/cache/
+
+# cedet
+ede-projects.el
+
+# smex
+smex-items
+
+# company-statistics
+company-statistics-cache.el
+
+# anaconda-mode
+anaconda-mode/
+
+### Go ###
+# Binaries for programs and plugins
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
+.glide/
+
+### macOS ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# End of https://www.gitignore.io/api/go,emacs,macos
+vendor

Gopkg.toml

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+
+# Gopkg.toml example
+#
+# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#  name = "github.com/x/y"
+#  version = "2.4.0"
+
+
+[[constraint]]
+  name = "github.com/jessevdk/go-flags"
+  version = "1.3.0"

LICENSE

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+MIT License
+
+Copyright (c) 2017 nasa9084
+
+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-license
+===========
+
+Get LICENSE from [GitHub Licenses API](https://developer.github.com/v3/licenses/).
+
+## Installation
+
+### go get
+
+`go get github.com/nasa9084/git-license`
+
+### download binary
+
+Download from [releases page](https://github.com/nasa9084/git-license/releases) and put the binary into your PATH.
+
+### build your own
+
+``` shell
+$ git clone https://github.com/nasa9084/git-license.git
+$ cd git-license
+$ dep ensure
+$ go build .
+```
+
+and copy or move `git-license` binary into your PATH.
+
+## How to use
+
+Basically:
+
+``` shell
+$ git license --username YOUR_USER_NAME LICENSE_NAME
+```
+
+such as: `git license --username nasa9084 mit`.
+
+You can see the list of license names with:
+
+``` shell
+$ git license -l
+```
+
+### Show HELP
+
+``` shell
+$ git license --help
+```

main.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	flags "github.com/jessevdk/go-flags"
+)
+
+type options struct {
+	GitHubAPIURI string `long:"github-api-uri" default:"https://api.github.com/licenses" default-mask:"-"  env:"GITHUB_API_URI" description:"URI for GitHub licenses API, without trailing slash"`
+	ListFlag     bool   `short:"l" long:"list" description:"show license name list"`
+	Username     string `short:"u" long:"username" env:"USERNAME" description:"Username to embed to LICENSE file"`
+	Year         string `short:"y" long:"year" default-mask:"current year" description:"License year"`
+	PosArgs      struct {
+		License string `positional-arg-name:"LICENSE"`
+	} `positional-args:"true"`
+}
+
+type license struct {
+	Key     string `json:"key"`
+	Name    string `json:"name"`
+	SPDXID  string `json:"spdx_id"`
+	URL     string `json:"url"`
+	HTMLURL string `json:"html_url"`
+}
+
+type licenseDetail struct {
+	Key            string   `json:"key"`
+	Name           string   `json:"name"`
+	SPDXID         string   `json:"spdx_id"`
+	URL            string   `json:"url"`
+	HTMLURL        string   `json:"html_url"`
+	Description    string   `json:"description"`
+	Implementation string   `json:"implementation"`
+	Permissions    []string `json:"permissions"`
+	Conditions     []string `json:"conditions"`
+	Limitations    []string `json:"limitations"`
+	Body           string   `json:"body"`
+}
+
+func main() { os.Exit(exec()) }
+
+func exec() int {
+	var opts options
+	if _, err := flags.Parse(&opts); err != nil {
+		if fe, ok := err.(*flags.Error); ok && fe.Type == flags.ErrHelp {
+			return 0
+		}
+
+		printErr(err)
+		return 1
+	}
+	if opts.ListFlag {
+		return showList(opts)
+	}
+	return showLicense(opts)
+}
+
+func showList(opts options) int {
+	res, err := http.Get(opts.GitHubAPIURI)
+	if err != nil {
+		printErr(err)
+		return 1
+	}
+	if res.StatusCode != http.StatusOK {
+		apiErr(res.StatusCode, res.Body)
+		return 1
+	}
+	var licenses []license
+	if err := json.NewDecoder(res.Body).Decode(&licenses); err != nil {
+		printErr(err)
+		return 1
+	}
+	var names []string
+	for _, l := range licenses {
+		names = append(names, l.Key)
+	}
+	fmt.Print(strings.Join(names, "\n"))
+	return 0
+}
+
+func showLicense(opts options) int {
+	if opts.PosArgs.License == "" || opts.Username == "" {
+		printErr(fmt.Errorf("license and username is required"))
+		return 1
+	}
+	uri := opts.GitHubAPIURI + "/" + strings.ToLower(opts.PosArgs.License)
+	res, err := http.Get(uri)
+	if err != nil {
+		printErr(err)
+		return 1
+	}
+	if res.StatusCode != http.StatusOK {
+		apiErr(res.StatusCode, res.Body)
+		return 1
+	}
+	var license licenseDetail
+	if err := json.NewDecoder(res.Body).Decode(&license); err != nil {
+		printErr(err)
+		return 1
+	}
+	year := opts.Year
+	if year == "" {
+		year = strconv.Itoa(time.Now().Year())
+	}
+	text := license.Body
+	text = strings.Replace(text, "[year]", year, -1)
+	text = strings.Replace(text, "[fullname]", opts.Username, -1)
+	fmt.Print(text)
+	return 0
+}
+
+func apiErr(code int, body io.Reader) {
+	b, err := ioutil.ReadAll(body)
+	if err != nil {
+		printErr(err)
+	}
+	printErr(fmt.Errorf("api error [%d] %s", code, string(b)))
+}
+
+func printErr(err error) {
+	fmt.Fprintf(os.Stderr, "error occured: %s\n", err)
+}