Strip ANSI escapes from managed ComfyUI output in the log; spawn child with NO_COLOR/TERM=dumb

internal/supervise/supervise.go

@@ -13,6 +13,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"regexp"
 	"runtime"
 	"strings"
 	"sync"
@@ -185,6 +186,9 @@ func (p *Process) EnsureRunning() error {
 	p.external = false
 	cmd := exec.Command(p.argv[0], p.argv[1:]...)
 	cmd.Dir = p.dir
+	// Ask the child not to colorize (ComfyUI ignores this and colors
+	// anyway, so pipeLog also strips escape sequences).
+	cmd.Env = append(os.Environ(), "NO_COLOR=1", "TERM=dumb")
 	stdout, err := cmd.StdoutPipe()
 	if err != nil {
 		return err
@@ -278,7 +282,9 @@ func (p *Process) WatchIdle(ctx context.Context, idleTimeout time.Duration, gpuI
 }
 
 // pipeLog forwards one child output stream to the log at INFO, line by
-// line, prefixed with the process name.
+// line, prefixed with the process name. ANSI escape sequences are
+// stripped: ComfyUI colorizes unconditionally, and the escapes only
+// render as garbage in a log file.
 func (p *Process) pipeLog(r io.Reader) {
 	buf := make([]byte, 4096)
 	var line string
@@ -290,18 +296,25 @@ func (p *Process) pipeLog(r io.Reader) {
 			if i < 0 {
 				break
 			}
-			p.log.Info(p.name + ": " + strings.TrimRight(line[:i], "\r"))
+			p.log.Info(p.name + ": " + stripANSI(strings.TrimRight(line[:i], "\r")))
 			line = line[i+1:]
 		}
 		if err != nil {
 			if strings.TrimSpace(line) != "" {
-				p.log.Info(p.name + ": " + line)
+				p.log.Info(p.name + ": " + stripANSI(line))
 			}
 			return
 		}
 	}
 }
 
+// ansiPattern matches CSI escape sequences (colors, cursor moves, …).
+var ansiPattern = regexp.MustCompile("\x1b\\[[0-9;?]*[a-zA-Z]")
+
+func stripANSI(s string) string {
+	return ansiPattern.ReplaceAllString(s, "")
+}
+
 // stopTree kills cmd's process, including its children on Windows (python
 // launchers tend to spawn some). The Wait goroutine reaps it.
 func stopTree(cmd *exec.Cmd) {

internal/supervise/supervise_test.go

@@ -239,3 +239,17 @@ func TestComfyLayoutAndDefaultCommand(t *testing.T) {
 		t.Errorf("missing-layout script = %s", script)
 	}
 }
+
+func TestStripANSI(t *testing.T) {
+	cases := map[string]string{
+		"\x1b[32m[INFO]\x1b[0m Starting server":   "[INFO] Starting server",
+		"\x1b[1m\x1b[31m[ERROR]\x1b[0m boom":      "[ERROR] boom",
+		"plain line":                              "plain line",
+		"\x1b[33mWARN\x1b[0m: \x1b[1mbold\x1b[0m": "WARN: bold",
+	}
+	for in, want := range cases {
+		if got := stripANSI(in); got != want {
+			t.Errorf("stripANSI(%q) = %q, want %q", in, got, want)
+		}
+	}
+}