forked from mongodb/mongo-go-driver
/
main.go
80 lines (73 loc) · 1.79 KB
/
main.go
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package main
import (
"bytes"
"flag"
"fmt"
"log"
"os"
"go.mongodb.org/mongo-driver/x/mongo/driver/drivergen"
"golang.org/x/tools/imports"
)
func main() {
fs := flag.NewFlagSet("", flag.ExitOnError)
fs.Usage = func() {
fmt.Fprintln(fs.Output(), "operationgen is used to generate operation implementations.")
fmt.Fprintln(fs.Output(), "usage: operationgen <operation configuration file> <package name> <generated file name>")
fs.PrintDefaults()
}
var dryrun bool
fs.BoolVar(&dryrun, "dryrun", false, "prints the output to stdout instead of writing to a file.")
err := fs.Parse(os.Args[1:])
if err == flag.ErrHelp {
fs.Usage()
os.Exit(0)
}
if err != nil {
log.Fatalf("Could not parse flags: %v", err)
}
args := fs.Args()
if len(args) < 3 {
log.Println("Insufficient arguments specified.")
fs.Usage()
os.Exit(1)
}
config := args[0]
pkg := args[1]
filename := args[2]
err = drivergen.Initialize()
if err != nil {
log.Fatalf("Could not initialize drivergen: %v", err)
}
op, err := drivergen.ParseFile(config, pkg)
if err != nil {
log.Fatalf("Could not parse configuration file '%s': %v", config, err)
}
var b bytes.Buffer
err = op.Generate(&b)
if err != nil {
log.Fatalf("Could not generate operation: %v", err)
}
wd, err := os.Getwd()
if err != nil {
log.Fatalf("Could not get the current working directory: %v", err)
}
buf, err := imports.Process(wd, b.Bytes(), nil)
if err != nil {
if dryrun {
fmt.Println(b.String())
}
log.Fatalf("Could not run goimports on generated file: %v", err)
}
if dryrun {
os.Stdout.Write(buf)
os.Exit(0)
}
file, err := os.Create(filename)
if err != nil {
log.Fatalf("Could not create %s: %v", filename, err)
}
_, err = file.Write(buf)
if err != nil {
log.Fatalf("Could not write to %s: %v", filename, err)
}
}