1 files changed, 63 insertions, 0 deletions
diff --git a/cli/internal/util/printf.go b/cli/internal/util/printf.go
new file mode 100644
index 0000000..9cd6dce
--- /dev/null
+++ b/cli/internal/util/printf.go
@@ -0,0 +1,63 @@
+// Copyright Thought Machine, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+package util
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/vercel/turbo/cli/internal/ui"
+)
+
+// initPrintf sets up the replacements used by printf.
+func InitPrintf() {
+	if !ui.IsTTY {
+		replacements = map[string]string{}
+	}
+}
+
+// printf is used throughout this package to print something to stderr with some
+// replacements for pseudo-shell variables for ANSI formatting codes.
+func Sprintf(format string, args ...interface{}) string {
+	return os.Expand(fmt.Sprintf(format, args...), replace)
+}
+
+func Printf(format string, args ...interface{}) {
+	fmt.Fprint(os.Stderr, os.Expand(fmt.Sprintf(format, args...), replace))
+}
+
+func Fprintf(writer io.Writer, format string, args ...interface{}) {
+	fmt.Fprint(writer, os.Expand(fmt.Sprintf(format, args...), replace))
+}
+
+func replace(s string) string {
+	return replacements[s]
+}
+
+// These are the standard set of replacements we use.
+var replacements = map[string]string{
+	"BOLD":         "\x1b[1m",
+	"BOLD_GREY":    "\x1b[30;1m",
+	"BOLD_RED":     "\x1b[31;1m",
+	"BOLD_GREEN":   "\x1b[32;1m",
+	"BOLD_YELLOW":  "\x1b[33;1m",
+	"BOLD_BLUE":    "\x1b[34;1m",
+	"BOLD_MAGENTA": "\x1b[35;1m",
+	"BOLD_CYAN":    "\x1b[36;1m",
+	"BOLD_WHITE":   "\x1b[37;1m",
+	"UNDERLINE":    "\x1b[4m",
+	"GREY":         "\x1b[2m",
+	"RED":          "\x1b[31m",
+	"GREEN":        "\x1b[32m",
+	"YELLOW":       "\x1b[33m",
+	"BLUE":         "\x1b[34m",
+	"MAGENTA":      "\x1b[35m",
+	"CYAN":         "\x1b[36m",
+	"WHITE":        "\x1b[37m",
+	"WHITE_ON_RED": "\x1b[37;41;1m",
+	"RED_NO_BG":    "\x1b[31;49;1m",
+	"RESET":        "\x1b[0m",
+	"ERASE_AFTER":  "\x1b[K",
+	"CLEAR_END":    "\x1b[0J",
+}