/
main.go
171 lines (149 loc) · 4.48 KB
/
main.go
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// Command sqlgen generates code that makes it easier to scan SQL rows into structs.
package main
import (
"bytes"
"context"
"fmt"
"go/format"
"io"
"os"
"sort"
"strings"
"github.com/spf13/pflag"
"golang.org/x/tools/go/packages"
"htdvisser.dev/exp/clicontext"
"htdvisser.dev/exp/stringslice"
)
const usage = `sqlgen [options] [package] [type]`
var (
flags = pflag.NewFlagSet("sqlgen", pflag.ContinueOnError)
tagName = flags.String("tag-name", "json", "Name of the struct tag to extract the field name from")
plural = flags.String("plural", "", "Plural form of the type (default: type+s)")
idFieldName = flags.String("id-field", "ID", "Name of the ID field")
fieldMaskSuffix = flags.String("fieldmask-suffix", "FieldMask", "Suffix of the struct that is the field mask")
pkg = flags.String("pkg", "", "Package name")
model = flags.Bool("model", true, "Generate model")
modelSuffix = flags.String("model-suffix", "", "Suffix of the model to generate")
setterTo = flags.String("setter-to", "SetTo", "Name of the method that sets fields to the source struct")
setterFrom = flags.String("setter-from", "SetFrom", "Name of the method that sets fields from the source struct")
dialect = flags.String("dialect", "PostgreSQL", "SQL dialect to use")
columns = flags.String("columns", "Columns", "Name of the method that returns columns")
pointers = flags.String("pointers", "Pointers", "Name of the method that returns pointers")
values = flags.String("values", "Values", "Name of the method that returns values")
crud = flags.Bool("crud", true, "Generate CRUD functions")
table = flags.String("table", "", "Table name (default: lowercase type+s)")
out = flags.StringP("out", "o", "", "Output file (default is STDOUT)")
)
func main() {
ctx, exit := clicontext.WithInterruptAndExit(context.Background())
defer exit()
flags.Usage = func() {
fmt.Fprintln(os.Stderr, usage)
flags.PrintDefaults()
}
if err := flags.Parse(os.Args[1:]); err != nil {
switch err {
case pflag.ErrHelp:
default:
fmt.Fprintln(os.Stderr, err)
}
return
}
args := flags.Args()
if len(args) != 2 {
flags.Usage()
clicontext.SetExitCode(ctx, 2)
return
}
if err := Main(ctx, args...); err != nil {
fmt.Fprintln(os.Stderr, err)
clicontext.SetExitCode(ctx, 1)
return
}
}
func Main(ctx context.Context, args ...string) (err error) {
cfg := &packages.Config{
Mode: packages.NeedName |
packages.NeedImports |
packages.NeedTypes,
Context: ctx,
}
lpkgs, err := packages.Load(cfg, args[0])
if err != nil {
return err
}
if len(lpkgs) != 1 {
return fmt.Errorf("found more than one package")
}
data := Data{
Options: Options{
PackageName: *pkg,
Model: *model,
ModelSuffix: *modelSuffix,
SetterTo: *setterTo,
SetterFrom: *setterFrom,
Dialect: *dialect,
Columns: *columns,
Pointers: *pointers,
Values: *values,
CRUD: *crud,
Plural: *plural,
IDField: *idFieldName,
Table: *table,
},
Imports: []string{
lpkgs[0].PkgPath,
},
}
if data.Options.PackageName == "" {
data.Options.PackageName = lpkgs[0].Name
}
if data.Options.Plural == "" {
data.Options.Plural = args[1] + "s"
}
if data.Options.Table == "" {
data.Options.Table = strings.ToLower(data.Options.Plural)
}
data.EntityType, err = BuildStructType(lpkgs[0], args[1])
if err != nil {
return err
}
data.Imports = append(data.Imports, data.EntityType.Imports()...)
data.FieldMaskType, err = BuildStructType(lpkgs[0], args[1]+*fieldMaskSuffix)
if err != nil {
return err
}
data.Imports = append(data.Imports, data.FieldMaskType.Imports()...)
data.Imports = stringslice.Filter(data.Imports, stringslice.Unique(len(data.Imports)))
sort.Strings(data.Imports)
for _, field := range data.EntityType.Fields {
if field.Name == data.Options.IDField {
data.IDField = field
break
}
}
var buf bytes.Buffer
if err = fileTemplate.Execute(&buf, data); err != nil {
return err
}
source := buf.Bytes()
source, err = format.Source(source)
if err != nil {
return err
}
var w io.Writer = os.Stdout
if *out != "" {
f, err := os.OpenFile(*out, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return fmt.Errorf("could not open %q for writing: %w", *out, err)
}
defer func() {
if closeErr := f.Close(); err == nil {
err = closeErr
}
}()
w = f
}
_, err = w.Write(source)
return err
}