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|
// Copyright 2021 Roxy Light
// SPDX-License-Identifier: ISC
// Package shell provides a minimal SQLite REPL, similar to the built-in one.
// This is useful for providing a REPL with custom functions.
package shell
import (
"fmt"
"io"
"os"
"strings"
"unicode"
"github.com/chzyer/readline"
"modernc.org/libc"
lib "modernc.org/sqlite/lib"
"zombiezen.com/go/sqlite"
"zombiezen.com/go/sqlite/sqlitex"
)
const (
prompt = "sqlite> "
continuationPrompt = " ...> "
)
// Run runs an interactive shell on the process's standard I/O.
func Run(conn *sqlite.Conn) {
tls := libc.NewTLS()
defer tls.Close()
rl, err := readline.NewEx(&readline.Config{
Prompt: prompt,
})
if err != nil {
fmt.Fprintln(os.Stderr, err)
return
}
defer rl.Close()
if readline.DefaultIsTerminal() {
fmt.Printf("SQLite version %s\n", sqlite.Version)
}
var sql string
for {
if len(sql) > 0 {
rl.SetPrompt(continuationPrompt)
} else {
rl.SetPrompt(prompt)
}
line, err := rl.Readline()
if err == io.EOF {
break
}
if err != nil {
fmt.Fprintln(os.Stderr, err)
return
}
if len(sql) == 0 && strings.HasPrefix(line, ".") {
wordEnd := strings.IndexFunc(line, unicode.IsSpace)
if wordEnd == -1 {
wordEnd = len(line)
}
switch word := line[1:wordEnd]; word {
case "schema":
err := sqlitex.ExecuteTransient(conn, `SELECT sql FROM sqlite_master;`, &sqlitex.ExecOptions{
ResultFunc: func(stmt *sqlite.Stmt) error {
fmt.Println(stmt.ColumnText(0) + ";")
return nil
},
})
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
case "quit":
return
default:
fmt.Fprintf(os.Stderr, "unknown command .%s\n", word)
}
continue
}
line = strings.TrimLeftFunc(line, unicode.IsSpace)
if line == "" {
continue
}
sql += line + "\n"
if !strings.Contains(line, ";") {
continue
}
for isCompleteStmt(tls, sql) {
sql = strings.TrimLeftFunc(sql, unicode.IsSpace)
if sql == "" {
break
}
stmt, trailingBytes, err := conn.PrepareTransient(sql)
sql = sql[len(sql)-trailingBytes:]
if err != nil {
fmt.Fprintln(os.Stderr, err)
continue
}
for {
hasData, err := stmt.Step()
if err != nil {
fmt.Fprintln(os.Stderr, err)
break
}
if !hasData {
break
}
row := new(strings.Builder)
for i, n := 0, stmt.ColumnCount(); i < n; i++ {
if i > 0 {
row.WriteString("|")
}
switch stmt.ColumnType(i) {
case sqlite.TypeInteger:
fmt.Fprint(row, stmt.ColumnInt64(i))
case sqlite.TypeFloat:
fmt.Fprint(row, stmt.ColumnFloat(i))
case sqlite.TypeBlob:
buf := make([]byte, stmt.ColumnLen(i))
stmt.ColumnBytes(i, buf)
row.Write(buf)
case sqlite.TypeText:
row.WriteString(stmt.ColumnText(i))
}
}
fmt.Println(row)
}
stmt.Finalize()
}
}
}
func isCompleteStmt(tls *libc.TLS, s string) bool {
if s == "" {
return true
}
c, err := libc.CString(s + ";")
if err != nil {
panic(err)
}
defer libc.Xfree(tls, c)
return lib.Xsqlite3_complete(tls, c) != 0
}
|
