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main.go
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main.go
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package main
import (
"fmt"
"os"
"path/filepath"
"strings"
"gopkg.in/alecthomas/kingpin.v2"
"gopkg.in/yaml.v2"
)
const ENUMBOX = "enumbox.yml"
func main() {
enumbox := kingpin.New("enumbox", "A tool to generate Go code from YAML files.")
generateCmd := enumbox.Command("generate", "Generate Go code from YAML files.")
generateNameArg := generateCmd.Arg("name", "The name of the package.").Required().String()
initCmd := enumbox.Command("init", "Initialize a new YAML file.")
initNameArg := initCmd.Arg("name", "The name of the package.").Required().String()
cmd, err := enumbox.Parse(os.Args[1:])
if err != nil {
enumbox.FatalUsage(err.Error())
}
switch cmd {
case generateCmd.FullCommand():
base := filepath.Join(strings.Split(*generateNameArg, "/")...)
path := filepath.Join(base, ENUMBOX)
if _, err := os.Stat(path); os.IsNotExist(err) {
panic("File does not exist.")
}
f, err := os.Open(path)
if err != nil {
panic(err)
}
decoder := yaml.NewDecoder(f)
box := EnumBox{}
if err := decoder.Decode(&box); err != nil {
panic(err)
}
f.Close()
f, err = os.Create(filepath.Join(base, "enumbox.go"))
if err != nil {
panic(err)
}
defer f.Close()
fmt.Fprintln(f, "package "+filepath.Base(base)+"\n")
// imports
fmt.Fprintf(f, "import (\n")
for _, i := range box.Imports {
fmt.Fprintf(f, "\t\"%s\"\n", i)
}
fmt.Fprint(f, ")\n\n")
// Variables
fmt.Fprint(f, "var (\n")
for _, variable := range box.Variables {
fmt.Fprintf(f, "\t%s %s = %s\n", variable.Name, variable.Type, variable.Value)
}
fmt.Fprint(f, ")\n\n")
// Functions
for _, variable := range box.Variables {
fmt.Fprintf(f, "func %s() %s {\n", strings.ToUpper(variable.Name), variable.Type)
fmt.Fprintf(f, "\treturn %s\n", variable.Name)
fmt.Fprint(f, "}\n\n")
}
// GetName
fmt.Fprint(f, "func NameOf(data interface{}) string {\n")
fmt.Fprint(f, "\tswitch data {\n")
for _, variable := range box.Variables {
fmt.Fprintf(f, "\tcase %s:\n", variable.Name)
fmt.Fprintf(f, "\t\treturn \"%s\"\n", variable.Name)
}
fmt.Fprint(f, "\t}\n")
fmt.Fprint(f, "\treturn \"\"\n")
fmt.Fprint(f, "}\n\n")
// GetIndex
fmt.Fprint(f, "func IndexOf(data interface{}) int {\n")
fmt.Fprint(f, "\tswitch data {\n")
for i, variable := range box.Variables {
fmt.Fprintf(f, "\tcase %s:\n", variable.Name)
fmt.Fprintf(f, "\t\treturn %d\n", i)
i++
}
fmt.Fprint(f, "\t}\n")
fmt.Fprint(f, "\treturn -1\n")
fmt.Fprint(f, "}\n\n")
// At
fmt.Fprint(f, "func At(index int) interface{} {\n")
fmt.Fprint(f, "\tswitch index {\n")
for i, variable := range box.Variables {
fmt.Fprintf(f, "\tcase %d:\n", i)
fmt.Fprintf(f, "\t\treturn %s\n", variable.Name)
}
fmt.Fprint(f, "\t}\n")
fmt.Fprint(f, "\treturn nil\n")
fmt.Fprint(f, "}\n\n")
// Euqal
for _, variable := range box.Variables {
fmt.Fprintf(f, "func EqualTo%s(b *%s) bool {\n", strings.ToUpper(variable.Name), variable.Type)
fmt.Fprintf(f, "\treturn %s == *b\n", variable.Name)
fmt.Fprint(f, "}\n\n")
}
// Names
fmt.Fprint(f, "func Names() []string {\n")
fmt.Fprint(f, "\treturn []string{\n")
for _, variable := range box.Variables {
fmt.Fprintf(f, "\t\t\"%s\",\n", variable.Name)
}
fmt.Fprint(f, "\t}\n")
fmt.Fprint(f, "}\n\n")
case initCmd.FullCommand():
initData := EnumBox{
Version: "0.0.1",
Variables: []Variable{
{
Name: "name",
Type: "string",
Value: `"merak"`,
},
{
Name: "age",
Type: "int",
Value: "28",
},
},
}
path := filepath.Join(strings.Split(*initNameArg, "/")...)
if err := os.MkdirAll(path, 0755); err != nil {
panic(err)
}
path = filepath.Join(path, ENUMBOX)
f, err := os.Create(path)
if err != nil {
panic(err)
}
defer f.Close()
encoder := yaml.NewEncoder(f)
if err := encoder.Encode(initData); err != nil {
panic(err)
}
}
}