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main.go
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120 lines (105 loc) · 2.48 KB
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package main
import (
"bufio"
"bytes"
"fmt"
"os"
"os/exec"
"strings"
"golang.org/x/xerrors"
)
const header = `// Code generated by gen/enum. DO NOT EDIT.
package database
`
func main() {
if err := run(); err != nil {
panic(err)
}
}
func run() error {
dump, err := os.Open("dump.sql")
if err != nil {
_, _ = fmt.Fprintf(os.Stderr, "error: %s must be run in the database directory with dump.sql present\n", os.Args[0])
return err
}
defer dump.Close()
var uniqueConstraints []string
s := bufio.NewScanner(dump)
query := ""
for s.Scan() {
line := strings.TrimSpace(s.Text())
switch {
case strings.HasPrefix(line, "--"):
case line == "":
case strings.HasSuffix(line, ";"):
query += line
if isUniqueConstraint(query) {
uniqueConstraints = append(uniqueConstraints, query)
}
query = ""
default:
query += line + " "
}
}
if err = s.Err(); err != nil {
return err
}
return writeContents("unique_constraint.go", uniqueConstraints, generateUniqueConstraints)
}
func isUniqueConstraint(query string) bool {
return strings.Contains(query, "UNIQUE")
}
func generateUniqueConstraints(queries []string) ([]byte, error) {
s := &bytes.Buffer{}
_, _ = fmt.Fprint(s, header)
_, _ = fmt.Fprint(s, `
// UniqueConstraint represents a named unique constraint on a table.
type UniqueConstraint string
// UniqueConstraint enums.
const (
`)
for _, query := range queries {
name := ""
switch {
case strings.Contains(query, "ALTER TABLE") && strings.Contains(query, "ADD CONSTRAINT"):
name = strings.Split(query, " ")[6]
case strings.Contains(query, "CREATE UNIQUE INDEX"):
name = strings.Split(query, " ")[3]
default:
return nil, xerrors.Errorf("unknown unique constraint format: %s", query)
}
_, _ = fmt.Fprintf(s, "\tUnique%s UniqueConstraint = %q // %s\n", nameFromSnakeCase(name), name, query)
}
_, _ = fmt.Fprint(s, ")\n")
return s.Bytes(), nil
}
func writeContents[T any](dest string, arg T, fn func(T) ([]byte, error)) error {
b, err := fn(arg)
if err != nil {
return err
}
err = os.WriteFile(dest, b, 0o600)
if err != nil {
return err
}
cmd := exec.Command("go", "run", "golang.org/x/tools/cmd/goimports@latest", "-w", dest)
return cmd.Run()
}
func nameFromSnakeCase(s string) string {
var ret string
for _, ss := range strings.Split(s, "_") {
switch ss {
case "id":
ret += "ID"
case "ids":
ret += "IDs"
case "jwt":
ret += "JWT"
case "idx":
ret += "Index"
default:
ret += strings.Title(ss)
}
}
return ret
}