tartrazine/internal/code-generator/generator/generator.go
2020-03-30 01:25:57 +03:00

75 lines
1.9 KiB
Go

// Package generator provides facilities to generate Go code for the
// package data in enry from YAML files describing supported languages in Linguist.
package generator
import (
"bytes"
"fmt"
"go/format"
"io"
"io/ioutil"
"path/filepath"
"strings"
"text/template"
)
// File is a common type for all generator functions.
// It generates Go source code file based on template in tmplPath,
// by parsing the data in fileToParse and linguist's samplesDir
// saving results to an outFile.
type File func(fileToParse, samplesDir, outPath, tmplPath, tmplName, commit string) error
func formatedWrite(outPath string, source []byte) error {
formatedSource, err := format.Source(source)
if err != nil {
return err
}
if err := ioutil.WriteFile(outPath, formatedSource, 0666); err != nil {
return err
}
return nil
}
func executeTemplate(w io.Writer, name, path, commit string, fmap template.FuncMap, data interface{}) error {
getCommit := func() string {
return commit
}
// stringVal returns escaped string that can be directly placed into go code.
// for value test`s it would return `test`+"`"+`s`
stringVal := func(val string) string {
val = strings.ReplaceAll(val, "`", "`+\"`\"+`")
return fmt.Sprintf("`%s`", val)
}
const headerTmpl = "header.go.tmpl"
headerPath := filepath.Join(filepath.Dir(path), headerTmpl)
h := template.Must(template.New(headerTmpl).Funcs(template.FuncMap{
"getCommit": getCommit,
"stringVal": stringVal,
}).ParseFiles(headerPath))
buf := bytes.NewBuffer(nil)
if err := h.Execute(buf, data); err != nil {
return err
}
if fmap == nil {
fmap = make(template.FuncMap)
}
fmap["getCommit"] = getCommit
fmap["stringVal"] = stringVal
t := template.Must(template.New(name).Funcs(fmap).ParseFiles(path))
if err := t.Execute(buf, data); err != nil {
return err
}
src, err := format.Source(buf.Bytes())
if err != nil {
return err
}
_, err = w.Write(src)
return err
}