spf13--cobra/cobra/cmd/add.go

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// 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"
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"os"
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"unicode"
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"github.com/spf13/cobra"
)
var (
packageName string
parentName string
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addCmd = &cobra.Command{
Use: "add [command name]",
Aliases: []string{"command"},
Short: "Add a command to a Cobra Application",
Long: `Add (cobra add) will create a new command, with a license and
the appropriate structure for a Cobra-based CLI application,
and register it to its parent (default rootCmd).
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If you want your command to be public, pass in the command name
with an initial uppercase letter.
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Example: cobra add server -> resulting in a new cmd/server.go`,
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Run: func(cmd *cobra.Command, args []string) {
if len(args) < 1 {
er("add needs a name for the command")
}
wd, err := os.Getwd()
if err != nil {
er(err)
}
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commandName := validateCmdName(args[0])
command := &Command{
CmdName: commandName,
CmdParent: parentName,
Project: &Project{
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AbsolutePath: wd,
Legal: getLicense(),
Copyright: copyrightLine(),
},
}
err = command.Create()
if err != nil {
er(err)
}
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fmt.Printf("%s created at %s\n", command.CmdName, command.AbsolutePath)
},
}
)
func init() {
addCmd.Flags().StringVarP(&packageName, "package", "t", "", "target package name (e.g. github.com/spf13/hugo)")
addCmd.Flags().StringVarP(&parentName, "parent", "p", "rootCmd", "variable name of parent command for this command")
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addCmd.Flags().MarkDeprecated("package", "this operation has been removed.")
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}
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// validateCmdName returns source without any dashes and underscore.
// If there will be dash or underscore, next letter will be uppered.
// It supports only ASCII (1-byte character) strings.
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// https://github.com/spf13/cobra/issues/269
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func validateCmdName(source string) string {
i := 0
l := len(source)
// The output is initialized on demand, then first dash or underscore
// occurs.
var output string
for i < l {
if source[i] == '-' || source[i] == '_' {
if output == "" {
output = source[:i]
}
// If it's last rune and it's dash or underscore,
// don't add it output and break the loop.
if i == l-1 {
break
}
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// If next character is dash or underscore,
// just skip the current character.
if source[i+1] == '-' || source[i+1] == '_' {
i++
continue
}
// If the current character is dash or underscore,
// upper next letter and add to output.
output += string(unicode.ToUpper(rune(source[i+1])))
// We know, what source[i] is dash or underscore and source[i+1] is
// uppered character, so make i = i+2.
i += 2
continue
}
// If the current character isn't dash or underscore,
// just add it.
if output != "" {
output += string(source[i])
}
i++
}
if output == "" {
return source // source is initially valid name.
}
return output
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}