From a97bc8c31b455b969edf67c642ce357fff761397 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Fri, 5 Feb 2021 01:08:55 +0100
Subject: [PATCH] chezmoi2: Don't output prompts when --no-tty is set

---
 chezmoi2/cmd/config.go   |  4 +---
 chezmoi2/cmd/terminal.go | 30 ++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/chezmoi2/cmd/config.go b/chezmoi2/cmd/config.go
index 68bb54e1558..d64ea4fe5a8 100644
--- a/chezmoi2/cmd/config.go
+++ b/chezmoi2/cmd/config.go
@@ -1311,10 +1311,8 @@ func (c *Config) validateData() error {
 }
 
 func (c *Config) withTerminal(prompt string, f func(terminal) error) error {
-	// FIXME this seems to wrap lines at 80 characters by default
-
 	if c.noTTY {
-		return f(newDumbTerminal(c.stdin, c.stdout, prompt))
+		return f(newNullTerminal(c.stdin))
 	}
 
 	if stdinFile, ok := c.stdin.(*os.File); ok && term.IsTerminal(int(stdinFile.Fd())) {
diff --git a/chezmoi2/cmd/terminal.go b/chezmoi2/cmd/terminal.go
index 07dce846160..a7fb4005715 100644
--- a/chezmoi2/cmd/terminal.go
+++ b/chezmoi2/cmd/terminal.go
@@ -21,6 +21,11 @@ type dumbTerminal struct {
 	prompt []byte
 }
 
+// A nullTerminal does not print any prompts and only reads.
+type nullTerminal struct {
+	reader *bufio.Reader
+}
+
 // newDumbTerminal returns a new dumbTerminal.
 func newDumbTerminal(reader io.Reader, writer io.Writer, prompt string) *dumbTerminal {
 	return &dumbTerminal{
@@ -56,6 +61,31 @@ func (t *dumbTerminal) ReadPassword(prompt string) (string, error) {
 	return strings.TrimSuffix(password, "\n"), nil
 }
 
+// SetPrompt implements terminal.SetPrompt.
 func (t *dumbTerminal) SetPrompt(prompt string) {
 	t.prompt = []byte(prompt)
 }
+
+// newNullTerminal returns a new nullTerminal.
+func newNullTerminal(r io.Reader) *nullTerminal {
+	return &nullTerminal{
+		reader: bufio.NewReader(r),
+	}
+}
+
+// ReadLine implements terminal.ReadLine.
+func (t *nullTerminal) ReadLine() (string, error) {
+	line, err := t.reader.ReadString('\n')
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSuffix(line, "\n"), nil
+}
+
+// ReadPassword implements terminal.ReadPassword.
+func (t *nullTerminal) ReadPassword(prompt string) (string, error) {
+	return t.ReadLine()
+}
+
+// SetPrompt implements terminal.SetPrompt.
+func (t *nullTerminal) SetPrompt(prompt string) {}