mirror of https://github.com/mum4k/termdash.git
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
// Copyright 2018 Google 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 faketerm
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// diff.go provides functions that highlight differences between fake terminals.
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import (
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"bytes"
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"fmt"
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"image"
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"reflect"
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"github.com/kylelemons/godebug/pretty"
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"github.com/mum4k/termdash/cell"
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)
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// optDiff is used to display differences in cell options.
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type optDiff struct {
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// point indicates the cell with the differing options.
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point image.Point
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got *cell.Options
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want *cell.Options
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}
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// Diff compares the two terminals, returning an empty string if there is not
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// difference. If a difference is found, returns a human readable description
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// of the differences.
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func Diff(want, got *Terminal) string {
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if reflect.DeepEqual(want.BackBuffer(), got.BackBuffer()) {
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return ""
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}
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var b bytes.Buffer
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b.WriteString("found differences between the two fake terminals.\n")
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b.WriteString(" got:\n")
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b.WriteString(got.String())
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b.WriteString(" want:\n")
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b.WriteString(want.String())
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b.WriteString(" diff (unexpected cells highlighted with rune '࿃')\n")
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b.WriteString(" note - this excludes cell options:\n")
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size := got.Size()
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var optDiffs []*optDiff
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for row := 0; row < size.Y; row++ {
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for col := 0; col < size.X; col++ {
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p := image.Point{col, row}
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partial, err := got.BackBuffer().IsPartial(p)
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if err != nil {
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panic(fmt.Errorf("unable to determine if point %v is a partial rune: %v", p, err))
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}
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gotCell := got.BackBuffer()[col][row]
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wantCell := want.BackBuffer()[col][row]
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r := gotCell.Rune
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if r != wantCell.Rune {
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r = '࿃'
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} else if r == 0 && !partial {
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r = ' '
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}
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b.WriteRune(r)
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if !reflect.DeepEqual(gotCell.Opts, wantCell.Opts) {
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optDiffs = append(optDiffs, &optDiff{
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point: image.Point{col, row},
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got: gotCell.Opts,
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want: wantCell.Opts,
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})
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}
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}
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b.WriteRune('\n')
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}
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if len(optDiffs) > 0 {
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b.WriteString(" Found differences in options on some of the cells:\n")
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for _, od := range optDiffs {
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if diff := pretty.Compare(od.want, od.got); diff != "" {
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b.WriteString(fmt.Sprintf("cell %v, diff (-want +got):\n%s\n", od.point, diff))
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}
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}
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}
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return b.String()
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}
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