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// 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,
}
}
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