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configure.go
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configure.go
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/*
* MIT License
*
* Copyright (c) 2022 Nicolas JUHEL
*
* 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.
*
*
*/
package cobra
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"github.com/mitchellh/go-homedir"
loglvl "github.com/nabbar/golib/logger/level"
"github.com/pelletier/go-toml"
spfcbr "github.com/spf13/cobra"
"gopkg.in/yaml.v3"
)
var cfgFile string
func (c *cobra) getDefaultPath(baseName string) (string, error) {
path := ""
// Find home directory.
home, err := homedir.Dir()
c.getLog().CheckError(loglvl.WarnLevel, loglvl.InfoLevel, "Loading home dir", err)
// set configname based on package name
if baseName == "" {
return "", fmt.Errorf("arguments missing: requires the destination file path")
}
path = filepath.Clean(home + string(filepath.Separator) + baseName + ".json")
if path == "." || path == ".json" {
return "", fmt.Errorf("arguments missing: requires the destination file path")
}
return path, nil
}
func (c *cobra) ConfigureCheckArgs(basename string, args []string) error {
if len(args) < 1 {
var err error
cfgFile, err = c.getDefaultPath(basename)
return err
} else if len(args) > 1 {
return fmt.Errorf("arguments error: too many file path specify")
} else {
cfgFile = args[0]
}
return nil
}
func (c *cobra) ConfigureWriteConfig(basename string, defaultConfig func() io.Reader, printMsg func(pkg, file string)) error {
pkg := c.getPackageName()
if basename == "" && pkg != "" {
basename = "." + strings.ToLower(pkg)
}
var (
fs *os.File
ext string
buf io.Reader
nbr int64
err error
)
ext = strings.ToLower(filepath.Ext(cfgFile))
switch ext {
case ".toml", ".tml":
if buf, err = c.jsonToToml(defaultConfig()); err != nil {
return err
}
case ".yaml", ".yml":
if buf, err = c.jsonToYaml(defaultConfig()); err != nil {
return err
}
default:
buf = defaultConfig()
cfgFile = strings.TrimSuffix(cfgFile, ext) + ".json"
}
// #nosec
fs, err = os.OpenFile(cfgFile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600)
if err != nil {
return err
} else {
defer func() {
if fs != nil {
_ = fs.Close()
}
}()
}
if nbr, err = io.Copy(fs, buf); err != nil {
return err
} else if nbr < 1 {
return fmt.Errorf("error wrting 0 byte to config file")
} else if err = fs.Close(); err != nil {
fs = nil
return err
} else {
fs = nil
}
err = os.Chmod(cfgFile, 0600)
if err != nil {
return err
}
if printMsg == nil {
println(fmt.Sprintf("\n\t>> Config File '%s' has been created and file permission have been set.", cfgFile))
println("\t>> To explicitly specify this config file when you call this tool, use the '-c' flag like this: ")
println(fmt.Sprintf("\t\t\t %s -c %s <cmd>...\n", pkg, cfgFile))
} else {
printMsg(pkg, cfgFile)
}
return nil
}
func (c *cobra) jsonToToml(r io.Reader) (io.Reader, error) {
var (
e error
p = make([]byte, 0)
buf = bytes.NewBuffer(p)
mod = make(map[string]interface{}, 0)
)
if p, e = io.ReadAll(r); e != nil {
return nil, e
} else if e = json.Unmarshal(p, &mod); e != nil {
return nil, e
} else if p, e = toml.Marshal(mod); e != nil {
return nil, e
} else {
buf.Write(p)
return buf, nil
}
}
func (c *cobra) jsonToYaml(r io.Reader) (io.Reader, error) {
var (
e error
p = make([]byte, 0)
buf = bytes.NewBuffer(p)
mod = make(map[string]interface{}, 0)
)
if p, e = io.ReadAll(r); e != nil {
return nil, e
} else if e = json.Unmarshal(p, &mod); e != nil {
return nil, e
} else if p, e = yaml.Marshal(mod); e != nil {
return nil, e
} else {
buf.Write(p)
return buf, nil
}
}
func (c *cobra) AddCommandConfigure(alias, basename string, defaultConfig func() io.Reader) {
pkg := c.getPackageName()
if basename == "" && pkg != "" {
basename = "." + strings.ToLower(pkg)
}
cmd := &spfcbr.Command{
Use: "configure <file path with valid extension (json, yaml, toml, ...) to be generated>",
Example: "configure ~/." + strings.ToLower(pkg) + ".yml",
Short: "Generate config file",
Long: `Generates a configuration file based on giving existing config flag
override by passed flag in command line and completed with default for non existing values.`,
RunE: func(cmd *spfcbr.Command, args []string) error {
return c.ConfigureWriteConfig(basename, defaultConfig, nil)
},
Args: func(cmd *spfcbr.Command, args []string) error {
return c.ConfigureCheckArgs(basename, args)
},
}
if len(alias) > 0 {
cmd.Aliases = []string{alias}
}
c.c.AddCommand(cmd)
}