mirror of
https://github.com/dolthub/dolt.git
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78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
// Copyright 2022 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cli
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import (
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"bytes"
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"fmt"
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func TestEphemeralPrinter(t *testing.T) {
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t.Run("DisplayPutsCursorAtLineStart", func(t *testing.T) {
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old := CliOut
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defer func() {
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CliOut = old
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}()
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var b bytes.Buffer
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CliOut = &b
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p := NewEphemeralPrinter()
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p.Printf("Hi!")
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p.Display()
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assert.Equal(t, b.String(), "Hi!\n")
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p.Display()
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assert.Equal(t, "Hi!\n"+clearLinesTxt(1), b.String())
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p.Printf("Newline!\n")
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p.Printf("And another one!")
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p.Printf("\nSomething else\n")
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p.Display()
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assert.Equal(t,
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"Hi!\n"+
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clearLinesTxt(1)+
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"Newline!\n"+
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"And another one!\n"+
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"Something else\n", b.String())
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p.Display()
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assert.Equal(t,
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"Hi!\n"+
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clearLinesTxt(1)+
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"Newline!\n"+
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"And another one!\n"+
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"Something else\n"+
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clearLinesTxt(3), b.String())
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})
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}
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// clearLinesTxt moves cursor up n lines and clears the screen from the cursor position to the end.
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// Inspired by https://github.com/vbauerster/mpb/blob/v8.0.2/cwriter/writer.go#L11-L15.
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func clearLinesTxt(n int) string {
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// These are ANSI escape codes, see
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// - https://en.wikipedia.org/wiki/ANSI_escape_code#C0_control_codes1
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// - https://en.wikipedia.org/wiki/ANSI_escape_code#Control_Sequence_Introducer_commands
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//
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// \x1b: ESC (Escape)
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// [%dA: CUU (Cursor Up). [5A means moves the cursor up 5 lines
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// [J : ED (Erase in Display)
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return fmt.Sprintf("\x1b[%dA\x1b[J", n)
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}
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