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// +build linux darwin freebsd openbsd netbsd dragonfly
// Copyright 2013-2015 Bowery, Inc.
package prompt
import (
"fmt"
)
// Refresh rewrites the prompt and buffer.
func (buf *Buffer) Refresh() error {
// If we're not echoing just write prompt.
if !buf.Echo {
_, err := buf.Out.Write(mvLeftEdge)
if err != nil {
return err
}
_, err = buf.Out.Write([]byte(buf.Prompt))
if err != nil {
return err
}
_, err = buf.Out.Write(delRight)
return err
}
prLen := len(buf.Prompt)
start := 0
size := buf.size
pos := buf.pos
// Get slice range that should be visible.
for prLen+pos >= buf.Cols {
start++
size--
pos--
}
for prLen+size > buf.Cols {
size--
}
_, err := buf.Out.Write(mvLeftEdge)
if err != nil {
return err
}
_, err = buf.Out.Write([]byte(buf.Prompt))
if err != nil {
return err
}
_, err = buf.Out.Write(toBytes(buf.data[start : size+start]))
if err != nil {
return err
}
_, err = buf.Out.Write(delRight)
if err != nil {
return err
}
_, err = buf.Out.Write([]byte(fmt.Sprintf(mvToCol, pos+prLen)))
return err
}
// ClsScreen clears the screen and refreshes.
func (buf *Buffer) ClsScreen() error {
_, err := buf.Out.Write(clsScreen)
if err != nil {
return err
}
return buf.Refresh()
}
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