spf13--cobra/cobra/cmd/init.go
Nick Miyake 1be1d2841c Make rootCmd private
Update Cobra generator to make rootCmd private rather than
exporting it. Also update examples in README to use the exported
Execute() command rather than referencing unexported rootCmd.

Fixes #556
2017-11-23 08:13:30 +01:00

234 lines
6.6 KiB
Go

// Copyright © 2015 Steve Francia <spf@spf13.com>.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"fmt"
"os"
"path"
"path/filepath"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
var initCmd = &cobra.Command{
Use: "init [name]",
Aliases: []string{"initialize", "initialise", "create"},
Short: "Initialize a Cobra Application",
Long: `Initialize (cobra init) will create a new application, with a license
and the appropriate structure for a Cobra-based CLI application.
* If a name is provided, it will be created in the current directory;
* If no name is provided, the current directory will be assumed;
* If a relative path is provided, it will be created inside $GOPATH
(e.g. github.com/spf13/hugo);
* If an absolute path is provided, it will be created;
* If the directory already exists but is empty, it will be used.
Init will not use an existing directory with contents.`,
Run: func(cmd *cobra.Command, args []string) {
wd, err := os.Getwd()
if err != nil {
er(err)
}
var project *Project
if len(args) == 0 {
project = NewProjectFromPath(wd)
} else if len(args) == 1 {
arg := args[0]
if arg[0] == '.' {
arg = filepath.Join(wd, arg)
}
if filepath.IsAbs(arg) {
project = NewProjectFromPath(arg)
} else {
project = NewProject(arg)
}
} else {
er("please provide only one argument")
}
initializeProject(project)
fmt.Fprintln(cmd.OutOrStdout(), `Your Cobra application is ready at
`+project.AbsPath()+`.
Give it a try by going there and running `+"`go run main.go`."+`
Add commands to it by running `+"`cobra add [cmdname]`.")
},
}
func initializeProject(project *Project) {
if !exists(project.AbsPath()) { // If path doesn't yet exist, create it
err := os.MkdirAll(project.AbsPath(), os.ModePerm)
if err != nil {
er(err)
}
} else if !isEmpty(project.AbsPath()) { // If path exists and is not empty don't use it
er("Cobra will not create a new project in a non empty directory: " + project.AbsPath())
}
// We have a directory and it's empty. Time to initialize it.
createLicenseFile(project.License(), project.AbsPath())
createMainFile(project)
createRootCmdFile(project)
}
func createLicenseFile(license License, path string) {
data := make(map[string]interface{})
data["copyright"] = copyrightLine()
// Generate license template from text and data.
text, err := executeTemplate(license.Text, data)
if err != nil {
er(err)
}
// Write license text to LICENSE file.
err = writeStringToFile(filepath.Join(path, "LICENSE"), text)
if err != nil {
er(err)
}
}
func createMainFile(project *Project) {
mainTemplate := `{{ comment .copyright }}
{{if .license}}{{ comment .license }}{{end}}
package main
import "{{ .importpath }}"
func main() {
cmd.Execute()
}
`
data := make(map[string]interface{})
data["copyright"] = copyrightLine()
data["license"] = project.License().Header
data["importpath"] = path.Join(project.Name(), filepath.Base(project.CmdPath()))
mainScript, err := executeTemplate(mainTemplate, data)
if err != nil {
er(err)
}
err = writeStringToFile(filepath.Join(project.AbsPath(), "main.go"), mainScript)
if err != nil {
er(err)
}
}
func createRootCmdFile(project *Project) {
template := `{{comment .copyright}}
{{if .license}}{{comment .license}}{{end}}
package cmd
import (
"fmt"
"os"
{{if .viper}}
homedir "github.com/mitchellh/go-homedir"{{end}}
"github.com/spf13/cobra"{{if .viper}}
"github.com/spf13/viper"{{end}}
){{if .viper}}
var cfgFile string{{end}}
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "{{.appName}}",
Short: "A brief description of your application",
Long: ` + "`" + `A longer description that spans multiple lines and likely contains
examples and usage of using your application. For example:
Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.` + "`" + `,
// Uncomment the following line if your bare application
// has an action associated with it:
// Run: func(cmd *cobra.Command, args []string) { },
}
// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := rootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func init() { {{if .viper}}
cobra.OnInitialize(initConfig)
{{end}}
// Here you will define your flags and configuration settings.
// Cobra supports persistent flags, which, if defined here,
// will be global for your application.{{ if .viper }}
rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.{{ .appName }}.yaml)"){{ else }}
// rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.{{ .appName }}.yaml)"){{ end }}
// Cobra also supports local flags, which will only run
// when this action is called directly.
rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
}{{ if .viper }}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" {
// Use config file from the flag.
viper.SetConfigFile(cfgFile)
} else {
// Find home directory.
home, err := homedir.Dir()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// Search config in home directory with name ".{{ .appName }}" (without extension).
viper.AddConfigPath(home)
viper.SetConfigName(".{{ .appName }}")
}
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
fmt.Println("Using config file:", viper.ConfigFileUsed())
}
}{{ end }}
`
data := make(map[string]interface{})
data["copyright"] = copyrightLine()
data["viper"] = viper.GetBool("useViper")
data["license"] = project.License().Header
data["appName"] = path.Base(project.Name())
rootCmdScript, err := executeTemplate(template, data)
if err != nil {
er(err)
}
err = writeStringToFile(filepath.Join(project.CmdPath(), "root.go"), rootCmdScript)
if err != nil {
er(err)
}
}