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templates.go
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templates.go
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//go:generate go run ./inliner/inliner.go
package templates
import (
"bytes"
"fmt"
"go/types"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"text/template"
"unicode"
"github.com/tinhtran24/gqlgen/internal/imports"
"github.com/pkg/errors"
)
// CurrentImports this is done with a global because subtemplates currently get called in functions. Lets aim to remove this eventually.
var CurrentImports *Imports
func Run(name string, tpldata interface{}) (*bytes.Buffer, error) {
// load path relative to calling source file
_, callerFile, _, _ := runtime.Caller(1)
rootDir := filepath.Dir(callerFile)
t := template.New("").Funcs(template.FuncMap{
"ucFirst": ucFirst,
"lcFirst": lcFirst,
"quote": strconv.Quote,
"rawQuote": rawQuote,
"toCamel": ToCamel,
"dump": dump,
"prefixLines": prefixLines,
"reserveImport": CurrentImports.Reserve,
"lookupImport": CurrentImports.Lookup,
})
var roots []string
for filename, data := range dataMap {
err := filepath.Walk(rootDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
name = filepath.ToSlash(strings.TrimPrefix(path, rootDir+string(os.PathSeparator))) + filename
t, err = t.New(name).Parse(data)
if err != nil {
panic(err)
}
roots = append(roots, name)
return nil
})
if err != nil {
return nil, err
}
}
buf := &bytes.Buffer{}
err := t.Lookup(name).Execute(buf, tpldata)
if err != nil {
return nil, err
}
return buf, nil
}
func ucFirst(s string) string {
if s == "" {
return ""
}
r := []rune(s)
r[0] = unicode.ToUpper(r[0])
return string(r)
}
func lcFirst(s string) string {
if s == "" {
return ""
}
r := []rune(s)
r[0] = unicode.ToLower(r[0])
return string(r)
}
func isDelimiter(c rune) bool {
return c == '-' || c == '_' || unicode.IsSpace(c)
}
func ToCamel(s string) string {
buffer := make([]rune, 0, len(s))
upper := true
lastWasUpper := false
for _, c := range s {
if isDelimiter(c) {
upper = true
continue
}
if !lastWasUpper && unicode.IsUpper(c) {
upper = true
}
if upper {
buffer = append(buffer, unicode.ToUpper(c))
} else {
buffer = append(buffer, unicode.ToLower(c))
}
upper = false
lastWasUpper = unicode.IsUpper(c)
}
return string(buffer)
}
func rawQuote(s string) string {
return "`" + strings.Replace(s, "`", "`+\"`\"+`", -1) + "`"
}
func dump(val interface{}) string {
switch val := val.(type) {
case int:
return strconv.Itoa(val)
case int64:
return fmt.Sprintf("%d", val)
case float64:
return fmt.Sprintf("%f", val)
case string:
return strconv.Quote(val)
case bool:
return strconv.FormatBool(val)
case nil:
return "nil"
case []interface{}:
var parts []string
for _, part := range val {
parts = append(parts, dump(part))
}
return "[]interface{}{" + strings.Join(parts, ",") + "}"
case map[string]interface{}:
buf := bytes.Buffer{}
buf.WriteString("map[string]interface{}{")
var keys []string
for key := range val {
keys = append(keys, key)
}
sort.Strings(keys)
for _, key := range keys {
data := val[key]
buf.WriteString(strconv.Quote(key))
buf.WriteString(":")
buf.WriteString(dump(data))
buf.WriteString(",")
}
buf.WriteString("}")
return buf.String()
default:
panic(fmt.Errorf("unsupported type %T", val))
}
}
func prefixLines(prefix, s string) string {
return prefix + strings.Replace(s, "\n", "\n"+prefix, -1)
}
func RenderToFile(tpl string, filename string, data interface{}) error {
if CurrentImports != nil {
panic(fmt.Errorf("recursive or concurrent call to RenderToFile detected"))
}
CurrentImports = &Imports{destDir: filepath.Dir(filename)}
// load path relative to calling source file
_, callerFile, _, _ := runtime.Caller(1)
rootDir := filepath.Dir(callerFile)
t := template.New("").Funcs(template.FuncMap{
"ucFirst": ucFirst,
"lcFirst": lcFirst,
"quote": strconv.Quote,
"rawQuote": rawQuote,
"toCamel": ToCamel,
"dump": dump,
"prefixLines": prefixLines,
"reserveImport": CurrentImports.Reserve,
"lookupImport": CurrentImports.Lookup,
})
var roots []string
// load all the templates in the directory
err := filepath.Walk(rootDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
name := filepath.ToSlash(strings.TrimPrefix(path, rootDir+string(os.PathSeparator)))
if !strings.HasSuffix(info.Name(), tpl) {
return nil
}
b, err := ioutil.ReadFile(path)
if err != nil {
return err
}
t, err = t.New(name).Parse(string(b))
if err != nil {
return errors.Wrap(err, filename)
}
roots = append(roots, name)
return nil
})
if err != nil {
return errors.Wrap(err, "locating templates")
}
// then execute all the important looking ones in order, adding them to the same file
sort.Slice(roots, func(i, j int) bool {
// important files go first
if strings.HasSuffix(roots[i], "!.gotpl") {
return true
}
if strings.HasSuffix(roots[j], "!.gotpl") {
return false
}
return roots[i] < roots[j]
})
var buf bytes.Buffer
for _, root := range roots {
err = t.Lookup(root).Execute(&buf, data)
if err != nil {
return errors.Wrap(err, root)
}
}
b := bytes.Replace(buf.Bytes(), []byte("%%%IMPORTS%%%"), []byte(CurrentImports.String()), -1)
CurrentImports = nil
return write(filename, b)
}
func write(filename string, b []byte) error {
err := os.MkdirAll(filepath.Dir(filename), 0755)
if err != nil {
return errors.Wrap(err, "failed to create directory")
}
formatted, err := imports.Prune(filename, b)
if err != nil {
fmt.Fprintf(os.Stderr, "gofmt failed on %s: %s\n", filepath.Base(filename), err.Error())
formatted = b
}
err = ioutil.WriteFile(filename, formatted, 0644)
if err != nil {
return errors.Wrapf(err, "failed to write %s", filename)
}
return nil
}
var pkgReplacer = strings.NewReplacer(
"/", "ᚋ",
".", "ᚗ",
"-", "ᚑ",
)
func TypeIdentifier(t types.Type) string {
res := ""
for {
switch it := t.(type) {
case *types.Pointer:
t.Underlying()
res += "ᚖ"
t = it.Elem()
case *types.Slice:
res += "ᚕ"
t = it.Elem()
case *types.Named:
res += pkgReplacer.Replace(it.Obj().Pkg().Path())
res += "ᚐ"
res += it.Obj().Name()
return res
case *types.Basic:
res += it.Name()
return res
case *types.Map:
res += "map"
return res
case *types.Interface:
res += "interface"
return res
default:
panic(fmt.Errorf("unexpected type %T", it))
}
}
}