mirror of
https://github.com/dnote/dnote
synced 2026-03-14 14:35:50 +01:00
84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
/* Copyright 2025 Dnote Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package assert
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import (
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"bufio"
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"io"
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"strings"
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"time"
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"github.com/pkg/errors"
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)
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// WaitForPrompt waits for an expected prompt to appear in stdout with a timeout.
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// Returns an error if the prompt is not found within the timeout period.
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// Handles prompts with or without newlines by reading character by character.
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func WaitForPrompt(stdout io.Reader, expectedPrompt string, timeout time.Duration) error {
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type result struct {
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found bool
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err error
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}
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resultCh := make(chan result, 1)
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go func() {
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reader := bufio.NewReader(stdout)
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var buffer strings.Builder
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found := false
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for {
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b, err := reader.ReadByte()
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if err != nil {
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resultCh <- result{found: found, err: err}
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return
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}
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buffer.WriteByte(b)
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if strings.Contains(buffer.String(), expectedPrompt) {
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found = true
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break
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}
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}
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resultCh <- result{found: found, err: nil}
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}()
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select {
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case res := <-resultCh:
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if res.err != nil && res.err != io.EOF {
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return errors.Wrap(res.err, "reading stdout")
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}
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if !res.found {
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return errors.Errorf("expected prompt '%s' not found in stdout", expectedPrompt)
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}
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return nil
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case <-time.After(timeout):
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return errors.Errorf("timeout waiting for prompt '%s'", expectedPrompt)
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}
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}
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// RespondToPrompt is a helper that waits for a prompt and sends a response.
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func RespondToPrompt(stdout io.Reader, stdin io.WriteCloser, expectedPrompt, response string, timeout time.Duration) error {
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if err := WaitForPrompt(stdout, expectedPrompt, timeout); err != nil {
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return err
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}
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if _, err := io.WriteString(stdin, response); err != nil {
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return errors.Wrap(err, "writing response to stdin")
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}
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return nil
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}
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