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templating.go
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templating.go
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package codegen
import (
"bytes"
"fmt"
"go/format"
"io"
"os"
"regexp"
"strings"
"text/template"
)
func goTemplate(dst string, tpl *template.Template, payload interface{}) (err error) {
var output io.WriteCloser
buf := bytes.Buffer{}
if err := tpl.Execute(&buf, payload); err != nil {
return err
}
fmtsrc, err := format.Source(buf.Bytes())
if err != nil {
_, _ = fmt.Fprintf(os.Stderr, "%s fmt warn: %v\n", dst, err)
err = nil
fmtsrc = buf.Bytes()
}
if dst == "" || dst == "-" {
output = os.Stdout
} else {
if output, err = os.Create(dst); err != nil {
return err
}
defer output.Close()
}
if _, err := output.Write(fmtsrc); err != nil {
return err
}
return nil
}
func plainTemplate(dst string, tpl *template.Template, payload interface{}) (err error) {
var output io.WriteCloser
buf := bytes.Buffer{}
if err := tpl.Execute(&buf, payload); err != nil {
return err
}
if dst == "" || dst == "-" {
output = os.Stdout
} else {
if output, err = os.Create(dst); err != nil {
return err
}
defer output.Close()
}
if _, err := output.Write(buf.Bytes()); err != nil {
return err
}
return nil
}
func camelCase(pp ...string) (out string) {
for i, p := range pp {
if i > 0 && len(p) > 1 {
p = strings.ToUpper(p[:1]) + p[1:]
}
out = out + p
}
return out
}
func kebabCase(pp string) (out string) {
var buf bytes.Buffer
for _, p := range pp {
if 'A' <= p && p <= 'Z' {
// just convert [A-Z] to _[a-z]
if buf.Len() > 0 {
buf.WriteRune('-')
}
buf.WriteRune(p - 'A' + 'a')
} else {
buf.WriteRune(p)
}
}
return buf.String()
}
// PubIdent returns published identifier by uppercasing
// input, cammelcasing it and removing ident unfriendly characters
var nonIdentChars = regexp.MustCompile(`[\s\\/]+`)
func export(pp ...string) (out string) {
for _, p := range pp {
if len(p) > 1 {
p = strings.ToUpper(p[:1]) + p[1:]
} else {
p = strings.ToUpper(p)
}
if ss := nonIdentChars.Split(p, -1); len(ss) > 1 {
p = export(ss...)
}
out = out + p
}
return out
}
func unexport(pp ...string) (out string) {
out = export(pp...)
return strings.ToLower(out[:1]) + out[1:]
}
func removePtr(name string) string {
return strings.TrimLeft(name, "*")
}
func hasPtr(name string) bool {
return len(name) > 0 && name[0:1] == "*"
}
func toggleExport(e bool, pp ...string) (out string) {
if e {
return export(pp...)
}
return unexport(pp...)
}
// convets to underscore
func cc2underscore(cc string) string {
var matchFirstCap = regexp.MustCompile("(.)([A-Z][a-z]+)")
var matchAllCap = regexp.MustCompile("([a-z0-9])([A-Z])")
u := matchFirstCap.ReplaceAllString(cc, "${1}_${2}")
u = matchAllCap.ReplaceAllString(u, "${1}_${2}")
return strings.ToLower(u)
}
// Handle list of imports, adds quotes around each import
//
// If import string contains a space, assume import alias and
// quotes only the 2nd part
func normalizeImport(i string) string {
if strings.Contains(i, " ") {
p := strings.SplitN(i, " ", 2)
return fmt.Sprintf(`%s "%s"`, p[0], strings.Trim(p[1], `"`))
} else {
return fmt.Sprintf(`"%s"`, strings.Trim(i, `"`))
}
}