Change default format to text

README.md

@@ -123,7 +123,7 @@ Output format, destination, and default level are configured at startup via envi
 | Variable | Values | Default |
 |---|---|---|
 | `SEI_LOG_LEVEL` | `debug`, `info`, `warn`, `error` | `info` |
-| `SEI_LOG_FORMAT` | `json`, `text` | `json` |
+| `SEI_LOG_FORMAT` | `json`, `text` | `text` |
 | `SEI_LOG_OUTPUT` | `stdout`, `stderr`, or an absolute file path | `stdout` |
 | `SEI_LOG_ADD_SOURCE` | `true`, `false` | `false` |
 

seilog.go

@@ -85,7 +85,7 @@
 // captured by each logger at creation time.
 //
 //	SEI_LOG_LEVEL      — Default level: debug, info, warn, error (default: info).
-//	SEI_LOG_FORMAT     — Output format: json or text (default: json).
+//	SEI_LOG_FORMAT     — Output format: json or text (default: text).
 //	SEI_LOG_OUTPUT     — Destination: stdout, stderr, or an absolute file path
 //	                     (default: stdout). File paths must not contain ".."
 //	                     components. Files are opened with mode 0600 and
@@ -227,10 +227,10 @@ func newHandler(format string, w io.Writer) slog.Handler {
 		Level:     slog.Level(math.MinInt), // Handler accepts all; LevelVar filters
 	}
 	switch strings.ToLower(strings.TrimSpace(format)) {
-	case "text", "plain":
-		return slog.NewTextHandler(w, opts)
-	default:
+	case "json":
 		return slog.NewJSONHandler(w, opts)
+	default:
+		return slog.NewTextHandler(w, opts)
 	}
 }
 

seilog_test.go

@@ -602,7 +602,7 @@ func TestLevelFiltering_RuntimeChange(t *testing.T) {
 func TestOutput_JSONFormat(t *testing.T) {
 	// Write to a temp file by setting env before creating a sub-process.
 	// Since we can't re-init, we test by creating a logger and writing
-	// to the global handler (which defaults to JSON on stdout).
+	// to the global handler (which defaults to text on stdout).
 	// We redirect via a pipe.
 
 	// Use a temp file approach: create a logger, write, read back.