"refactor(common): 重构序列化工具包，将serialize重命名为utils并添加bitset组件"

common/utils/log/term/getsize.go

@@ -0,0 +1,54 @@
+// Copyright 2013 Apcera Inc. All rights reserved.
+
+package term
+
+import (
+	"os"
+)
+
+// Size is the size of a terminal, expressed in character cells, as Lines and
+// Columns.  This might come from environment variables or OS-dependent
+// resources.
+type Size struct {
+	Lines   int
+	Columns int
+}
+
+// GetSize will return the terminal window size.
+//
+// We prefer environ $LINES/$COLUMNS, then fall back to tty-held information.
+// We do not support use of termcap/terminfo to derive default size information.
+func GetSize() (*Size, error) {
+	envSize := GetEnvWindowSize()
+	if envSize != nil && envSize.Lines != 0 && envSize.Columns != 0 {
+		return envSize, nil
+	}
+
+	fh, err := os.Open("/dev/tty")
+	if err != nil {
+		// no tty, no point continuing; we only let the environ
+		// avoid an error in this case because if someone has faked
+		// up an environ with LINES/COLUMNS _both_ set, we should let
+		// them
+		return nil, err
+	}
+
+	size, err := GetTerminalWindowSize(fh)
+	if err != nil {
+		if envSize != nil {
+			return envSize, nil
+		}
+		return nil, err
+	}
+	if envSize == nil {
+		return size, err
+	}
+
+	if envSize.Lines == 0 {
+		envSize.Lines = size.Lines
+	}
+	if envSize.Columns == 0 {
+		envSize.Columns = size.Columns
+	}
+	return envSize, nil
+}