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gen.go
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gen.go
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package main
import (
"bytes"
"flag"
"fmt"
"io"
"os"
"github.com/ajiyoshi-vg/scannergen/parse"
)
var (
input = flag.String("file", "", "input file name; required")
output = flag.String("o", "", "output file name; required")
pkgName = flag.String("pkg", "main", "output package name; required")
)
func main() {
flag.Parse()
root, err := parse.ParseAll(*input)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
// if the code is generated in a different folder
// that the struct we need to import the struct
if root.Pkg != *pkgName && *pkgName != "main" {
// TODO
}
var buf bytes.Buffer
writePackage(&buf, root.Pkg)
writeImports(&buf, root, "database/sql")
root.Each(func(n *parse.Node) {
writeRowFunc(&buf, n)
writeRowsFunc(&buf, n)
writeSliceFunc(&buf, n)
})
// formats the generated file using gofmt
pretty, err := format(&buf)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
// create output source for file. defaults to
// stdout but may be file.
var out io.WriteCloser = os.Stdout
if *output != "" {
out, err = os.Create(*output)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
defer out.Close()
}
io.Copy(out, pretty)
}