forked from hoisie/mustache
/
main.go
109 lines (99 loc) · 2.38 KB
/
main.go
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package main
import (
"fmt"
"io/ioutil"
"os"
"github.com/spf13/cobra"
"gopkg.in/yaml.v2"
"github.com/cbroglie/mustache"
)
var rootCmd = &cobra.Command{
Use: "mustache [--layout template] [data] template",
Example: ` $ mustache data.yml template.mustache
$ cat data.yml | mustache template.mustache
$ mustache --layout wrapper.mustache data template.mustache
$ mustache --override over.yml data.yml template.mustache`,
Args: cobra.RangeArgs(0, 2),
Run: func(cmd *cobra.Command, args []string) {
err := run(cmd, args)
if err != nil {
fmt.Printf("Error: %s\n", err.Error())
os.Exit(1)
}
},
}
var layoutFile string
var overrideFile string
func main() {
rootCmd.Flags().StringVar(&layoutFile, "layout", "", "location of layout file")
rootCmd.Flags().StringVar(&overrideFile, "override", "", "location of data.yml override yml")
rootCmd.Flags().BoolVar(&mustache.AllowMissingVariables, "allow-missing-variables", true, "allow missing variables")
if err := rootCmd.Execute(); err != nil {
os.Exit(1)
}
}
func run(cmd *cobra.Command, args []string) error {
if len(args) == 0 {
return cmd.Usage()
}
var data interface{}
var templatePath string
if len(args) == 1 {
var err error
data, err = parseDataFromStdIn()
if err != nil {
return err
}
templatePath = args[0]
} else {
var err error
data, err = parseDataFromFile(args[0])
if err != nil {
return err
}
templatePath = args[1]
}
if overrideFile != "" {
override, err := parseDataFromFile(overrideFile)
if err != nil {
return err
}
for k, v := range override.(map[interface{}]interface{}) {
data.(map[interface{}]interface{})[k] = v
}
}
var output string
var err error
if layoutFile != "" {
output, err = mustache.RenderFileInLayout(templatePath, layoutFile, data)
} else {
output, err = mustache.RenderFile(templatePath, data)
}
if err != nil {
return err
}
fmt.Print(output)
return nil
}
func parseDataFromStdIn() (interface{}, error) {
b, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return nil, err
}
var data interface{}
if err := yaml.Unmarshal(b, &data); err != nil {
return nil, err
}
return data, nil
}
func parseDataFromFile(filePath string) (interface{}, error) {
b, err := ioutil.ReadFile(filePath)
if err != nil {
return nil, err
}
var data interface{}
if err := yaml.Unmarshal(b, &data); err != nil {
return nil, err
}
return data, nil
}