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package printer
import (
"bytes"
"fmt"
"github.com/tinylib/msgp/gen"
"github.com/tinylib/msgp/parse"
"github.com/ttacon/chalk"
"golang.org/x/tools/imports"
"io"
"io/ioutil"
"strings"
)
func infof(s string, v ...interface{}) {
fmt.Printf(chalk.Magenta.Color(s), v...)
}
// PrintFile prints the methods for the provided list
// of elements to the given file name and canonical
// package path.
func PrintFile(file string, f *parse.FileSet, mode gen.Method) error {
out, tests, err := generate(f, mode)
if err != nil {
return err
}
// we'll run goimports on the main file
// in another goroutine, and run it here
// for the test file. empirically, this
// takes about the same amount of time as
// doing them in serial when GOMAXPROCS=1,
// and faster otherwise.
res := goformat(file, out.Bytes())
if tests != nil {
testfile := strings.TrimSuffix(file, ".go") + "_test.go"
err = format(testfile, tests.Bytes())
if err != nil {
return err
}
infof(">>> Wrote and formatted \"%s\"\n", testfile)
}
err = <-res
if err != nil {
return err
}
return nil
}
func format(file string, data []byte) error {
out, err := imports.Process(file, data, nil)
if err != nil {
return err
}
return ioutil.WriteFile(file, out, 0600)
}
func goformat(file string, data []byte) <-chan error {
out := make(chan error, 1)
go func(file string, data []byte, end chan error) {
end <- format(file, data)
infof(">>> Wrote and formatted \"%s\"\n", file)
}(file, data, out)
return out
}
func generate(f *parse.FileSet, mode gen.Method) (*bytes.Buffer, *bytes.Buffer, error) {
outbuf := bytes.NewBuffer(make([]byte, 0, 4096))
writePkgHeader(outbuf, f.Package)
writeImportHeader(outbuf, "github.com/tinylib/msgp/msgp")
var testbuf *bytes.Buffer
var testwr io.Writer
if mode&gen.Test == gen.Test {
testbuf = bytes.NewBuffer(make([]byte, 0, 4096))
writePkgHeader(testbuf, f.Package)
if mode&(gen.Encode|gen.Decode) != 0 {
writeImportHeader(testbuf, "bytes", "github.com/tinylib/msgp/msgp", "testing")
} else {
writeImportHeader(testbuf, "github.com/tinylib/msgp/msgp", "testing")
}
testwr = testbuf
}
return outbuf, testbuf, f.PrintTo(gen.NewPrinter(mode, outbuf, testwr))
}
func writePkgHeader(b *bytes.Buffer, name string) {
b.WriteString("package ")
b.WriteString(name)
b.WriteByte('\n')
b.WriteString("// NOTE: THIS FILE WAS PRODUCED BY THE\n// MSGP CODE GENERATION TOOL (github.com/tinylib/msgp)\n// DO NOT EDIT\n\n")
}
func writeImportHeader(b *bytes.Buffer, imports ...string) {
b.WriteString("import (\n")
for _, im := range imports {
fmt.Fprintf(b, "\t%q\n", im)
}
b.WriteString(")\n\n")
}
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