init converter

Author: rekby

tools/greenplum-to-pg-scheme-converter/README.md

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+Internal tool for convert Greenplum schema to postgres scheme by strim unsupported parts.
+
+It is not production ready solution, used for internal tests only.

tools/greenplum-to-pg-scheme-converter/go.mod

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+module github.com/ydb-platform/postgres-compatibility-tests/tools/greenplum-to-pg-scheme-converter
+
+go 1.22.3

tools/greenplum-to-pg-scheme-converter/greenplum-to-pg-scheme-converter.go

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+package main
+
+import (
+	"bufio"
+	"flag"
+	"io"
+	"os"
+)
+
+type Config struct {
+	InputFilePath        string
+	OutputFilePath       string
+	CommentExcludedLines bool
+}
+
+func main() {
+	cfg := initConfig()
+
+	reader := openReader(cfg.InputFilePath)
+	defer func() { _ = reader.Close() }()
+
+	writer := openWriter(cfg.OutputFilePath)
+	defer func() { _ = writer.Close() }()
+
+	c := Converter{
+		Input:           bufio.NewScanner(reader),
+		Output:          bufio.NewWriter(writer),
+		CommentExcluded: cfg.CommentExcludedLines,
+	}
+
+}
+
+func initConfig() Config {
+	var cfg Config
+	flag.StringVar(&cfg.InputFilePath, "input-file", "", "Path to input sql file with schema. Read from stdin by default.")
+	flag.StringVar(&cfg.OutputFilePath, "output-file", "", "Path to result of convertation. Stdout by default.")
+	flag.BoolVar(&cfg.CommentExcludedLines, "comment-excluded", false, "Comment excluded lines instead of remove it")
+	flag.Parse()
+
+	return cfg
+}
+
+func openReader(path string) io.ReadCloser {
+	if path == "" {
+		return io.NopCloser(os.Stdin)
+	}
+	return must(os.Open(path))
+}
+
+func openWriter(path string) io.WriteCloser {
+	if path == "" {
+		return os.Stdout
+	}
+	return must(os.Create(path))
+}
+
+func must0(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func must[R any](res R, err error) R {
+	must0(err)
+	return res
+}
+
+type Converter struct {
+	Input           *bufio.Scanner
+	Output          *bufio.Writer
+	CommentExcluded bool
+
+	state converterState
+}
+
+type converterState int
+
+const (
+	Empty converterState = iota
+	CreateTable
+	CreateTableExcludeSuffix
+	CreateView
+)
+
+func (c *Converter) Convert() {
+
+}