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package main
import (
"bytes"
"fmt"
"go/format"
"html/template"
"os"
"path/filepath"
"strings"
)
type generateType struct {
Name string
Initial string
Fields []generateField
}
type generateField struct {
Name string
TypeName string
JSONName string
}
// blog title:string Author:string PostCategory:string content:string some_thing:int
func parseType(args []string) (generateType, error) {
t := generateType{
Name: fieldName(args[0]),
}
t.Initial = strings.ToLower(string(t.Name[0]))
fields := args[1:]
for _, field := range fields {
f, err := parseField(field)
if err != nil {
return generateType{}, err
}
t.Fields = append(t.Fields, f)
}
return t, nil
}
func parseField(raw string) (generateField, error) {
// title:string
if !strings.Contains(raw, ":") {
return generateField{}, fmt.Errorf("Invalid generate argument. [%s]", raw)
}
pair := strings.Split(raw, ":")
field := generateField{
Name: fieldName(pair[0]),
TypeName: strings.ToLower(pair[1]),
JSONName: fieldJSONName(pair[0]),
}
return field, nil
}
// get the initial field name passed and check it for all possible cases
// MyTitle:string myTitle:string my_title:string -> MyTitle
// error-message:string -> ErrorMessage
func fieldName(name string) string {
// remove _ or - if first character
if name[0] == '-' || name[0] == '_' {
name = name[1:]
}
// remove _ or - if last character
if name[len(name)-1] == '-' || name[len(name)-1] == '_' {
name = name[:len(name)-1]
}
// upcase the first character
name = strings.ToUpper(string(name[0])) + name[1:]
// remove _ or - character, and upcase the character immediately following
for i := 0; i < len(name); i++ {
r := rune(name[i])
if isUnderscore(r) || isHyphen(r) {
up := strings.ToUpper(string(name[i+1]))
name = name[:i] + up + name[i+2:]
}
}
return name
}
// get the initial field name passed and convert to json-like name
// MyTitle:string myTitle:string my_title:string -> my_title
// error-message:string -> error-message
func fieldJSONName(name string) string {
// remove _ or - if first character
if name[0] == '-' || name[0] == '_' {
name = name[1:]
}
// downcase the first character
name = strings.ToLower(string(name[0])) + name[1:]
// check for uppercase character, downcase and insert _ before it if i-1
// isn't already _ or -
for i := 0; i < len(name); i++ {
r := rune(name[i])
if isUpper(r) {
low := strings.ToLower(string(r))
if name[i-1] == '_' || name[i-1] == '-' {
name = name[:i] + low + name[i+1:]
} else {
name = name[:i] + "_" + low + name[i+1:]
}
}
}
return name
}
func isUpper(char rune) bool {
if char >= 'A' && char <= 'Z' {
return true
}
return false
}
func isUnderscore(char rune) bool {
return char == '_'
}
func isHyphen(char rune) bool {
return char == '-'
}
func generateContentType(args []string) error {
name := args[0]
fileName := strings.ToLower(name) + ".go"
// open file in ./content/ dir
// if exists, alert user of conflict
pwd, err := os.Getwd()
if err != nil {
return err
}
contentDir := filepath.Join(pwd, "content")
filePath := filepath.Join(contentDir, fileName)
if _, err := os.Stat(filePath); !os.IsNotExist(err) {
return fmt.Errorf("Please remove '%s' before executing this command.", fileName)
}
// no file exists.. ok to write new one
file, err := os.Create(filePath)
defer file.Close()
if err != nil {
return err
}
// parse type info from args
gt, err := parseType(args)
if err != nil {
return fmt.Errorf("Failed to parse type args: %s", err.Error())
}
tmplPath := filepath.Join(pwd, "cmd", "ponzu", "contentType.tmpl")
tmpl, err := template.ParseFiles(tmplPath)
if err != nil {
return fmt.Errorf("Failed to parse template: %s", err.Error())
}
buf := &bytes.Buffer{}
err = tmpl.Execute(buf, gt)
if err != nil {
return fmt.Errorf("Failed to execute template: %s", err.Error())
}
fmtBuf, err := format.Source(buf.Bytes())
if err != nil {
return fmt.Errorf("Failed to format template: %s", err.Error())
}
_, err = file.Write(fmtBuf)
if err != nil {
return fmt.Errorf("Failed to write generated file buffer: %s", err.Error())
}
return nil
}
|
