"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/env.go

@@ -0,0 +1,43 @@
+// Copyright 2013 Apcera Inc. All rights reserved.
+
+package term
+
+import (
+	"os"
+	"strconv"
+)
+
+// GetEnvWindowSize returns the window Size, as determined by process
+// environment; if either LINES or COLUMNS is present, and whichever is
+// present is also numeric, the Size will be non-nil.  If Size is nil,
+// there's insufficient data in environ.  If one entry is 0, that means
+// that the environment does not include that data.  If a value is
+// negative, we treat that as an error.
+func GetEnvWindowSize() *Size {
+	lines := os.Getenv("LINES")
+	columns := os.Getenv("COLUMNS")
+	if lines == "" && columns == "" {
+		return nil
+	}
+
+	nLines := 0
+	nColumns := 0
+	var err error
+	if lines != "" {
+		nLines, err = strconv.Atoi(lines)
+		if err != nil || nLines < 0 {
+			return nil
+		}
+	}
+	if columns != "" {
+		nColumns, err = strconv.Atoi(columns)
+		if err != nil || nColumns < 0 {
+			return nil
+		}
+	}
+
+	return &Size{
+		Lines:   nLines,
+		Columns: nColumns,
+	}
+}