// addHistory persists a line of input to the readline history
// file.
func addHistory(line string) {
// readline.AddHistory will push command into memory and try to
// persist to disk (if readline.SetHistoryPath was called). err can
// be not nil only if it got a IO error while trying to persist.
if err := readline.AddHistory(line); err != nil {
log.Warningf("cannot save command-line history: %s", err)
log.Info("command-line history will not be saved in this session")
readline.SetHistoryPath("")
}
}
// runInteractive runs the SQL client interactively, presenting
// a prompt to the user for each statement.
func runInteractive(conn *sqlConn) (exitErr error) {
fullPrompt, continuePrompt := preparePrompts(conn.url)
if isatty.IsTerminal(os.Stdout.Fd()) {
// We only enable history management when the terminal is actually
// interactive. This saves on memory when e.g. piping a large SQL
// script through the command-line client.
userAcct, err := user.Current()
if err != nil {
if log.V(2) {
log.Warningf("cannot retrieve user information: %s", err)
log.Info("cannot load or save the command-line history")
}
} else {
histFile := filepath.Join(userAcct.HomeDir, ".cockroachdb_history")
readline.SetHistoryPath(histFile)
}
}
fmt.Print(infoMessage)
var stmt []string
for {
thisPrompt := fullPrompt
if len(stmt) > 0 {
thisPrompt = continuePrompt
}
l, err := readline.Line(thisPrompt)
if err == readline.ErrInterrupt || err == io.EOF {
break
} else if err != nil {
fmt.Fprintf(osStderr, "input error: %s\n", err)
return err
}
tl := strings.TrimSpace(l)
// Check if this is a request for help or a client-side command.
// If so, process it directly and skip query processing below.
status := handleInputLine(&stmt, tl)
if status == cliNextLine {
continue
} else if status == cliExit {
break
}
// We join the statements back together with newlines in case
// there is a significant newline inside a string literal. However
// we join with spaces for keeping history, because otherwise a
// history recall will only pull one line from a multi-line
// statement.
fullStmt := strings.Join(stmt, "\n")
// We save the history between each statement, This enables
// reusing history in another SQL shell without closing the
// current shell.
//
// AddHistory will push command into memory and try to persist
// to disk (if readline.SetHistoryPath was called).
// err can be not nil only if it got a IO error while
// trying to persist.
if err := readline.AddHistory(strings.Join(stmt, " ")); err != nil {
log.Warningf("cannot save command-line history: %s", err)
log.Info("command-line history will not be saved in this session")
readline.SetHistoryPath("")
}
if exitErr = runPrettyQuery(conn, os.Stdout, makeQuery(fullStmt)); exitErr != nil {
fmt.Fprintln(osStderr, exitErr)
}
// Clear the saved statement.
stmt = stmt[:0]
}
return exitErr
}