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Merge pull request #33 from nlnwa/egg
Just for fun
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| /* | ||
| * Copyright 2023 National Library of Norway. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| */ | ||
|
|
||
| package aart | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "errors" | ||
| "fmt" | ||
| "github.com/nfnt/resize" | ||
| "github.com/nlnwa/gowarc" | ||
| "github.com/nlnwa/warchaeology/internal/filter" | ||
| "github.com/nlnwa/warchaeology/internal/flag" | ||
| "github.com/spf13/cobra" | ||
| "github.com/spf13/viper" | ||
| "image" | ||
| "image/color" | ||
| _ "image/gif" | ||
| _ "image/jpeg" | ||
| _ "image/png" | ||
| "io" | ||
| "os" | ||
| "strconv" | ||
| ) | ||
|
|
||
| type conf struct { | ||
| offset int64 | ||
| recordNum int | ||
| filter *filter.Filter | ||
| } | ||
|
|
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| func NewCommand() *cobra.Command { | ||
| c := &conf{} | ||
| var cmd = &cobra.Command{ | ||
| Use: "aart", | ||
| Short: "Show images", | ||
| Long: ``, | ||
| Hidden: true, | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| if len(args) == 0 { | ||
| return errors.New("missing file name") | ||
| } | ||
| fileName := args[0] | ||
| c.offset = viper.GetInt64(flag.Offset) | ||
| c.recordNum = viper.GetInt(flag.RecordNum) | ||
|
|
||
| if c.offset < 0 { | ||
| c.offset = 0 | ||
| } | ||
|
|
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| viper.Set(flag.MimeType, []string{"image/gif", "image/jpeg", "image/png"}) | ||
| c.filter = filter.NewFromViper() | ||
|
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| readFile(c, fileName) | ||
| return nil | ||
| }, | ||
| } | ||
|
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| cmd.Flags().IntP("width", "w", 100, "Width of image") | ||
|
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| return cmd | ||
| } | ||
|
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| func readFile(c *conf, fileName string) { | ||
| wf, err := gowarc.NewWarcFileReader(fileName, c.offset, gowarc.WithBufferTmpDir(viper.GetString(flag.TmpDir))) | ||
| defer func() { _ = wf.Close() }() | ||
| if err != nil { | ||
| fmt.Printf("Error opening file: %v\n", err) | ||
| return | ||
| } | ||
|
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| num := 0 | ||
| count := 0 | ||
|
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| for { | ||
| wr, _, _, err := wf.Next() | ||
| if err == io.EOF { | ||
| break | ||
| } | ||
| if err != nil { | ||
| _, _ = fmt.Fprintf(os.Stderr, "Error: %v, rec num: %v, Offset %v\n", err.Error(), strconv.Itoa(count), c.offset) | ||
| break | ||
| } | ||
|
|
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| if !c.filter.Accept(wr) { | ||
| continue | ||
| } | ||
|
|
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| // Find record number | ||
| if c.recordNum > 0 && num < c.recordNum { | ||
| num++ | ||
| continue | ||
| } | ||
|
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| if b, ok := wr.Block().(gowarc.HttpResponseBlock); ok { | ||
| fmt.Printf("\u001B[2J\u001B[HUrl: %s\n\n", wr.WarcHeader().Get(gowarc.WarcTargetURI)) | ||
| r, err := b.PayloadBytes() | ||
| if err != nil { | ||
| fmt.Printf("Error: %v\n", err) | ||
| } | ||
| err = display(r, viper.GetInt("width")) | ||
| if err != nil { | ||
| fmt.Println("Couldn't decode image,\nError:", err.Error()) | ||
| continue | ||
| } | ||
| fmt.Printf("Hit enter to continue\n") | ||
| _, _ = fmt.Scanln() | ||
| } | ||
| } | ||
| } | ||
|
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| var asciiChar = "MND8OZ$7I?+=~:,.." | ||
|
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| func asciiArt(img image.Image, w, h int) []byte { | ||
| table := []byte(asciiChar) | ||
| buffer := new(bytes.Buffer) | ||
| for i := 0; i < h; i++ { | ||
| for j := 0; j < w; j++ { | ||
| g := grayscale(img.At(j, i)) | ||
| pos := len(asciiChar) * g / 65536 | ||
| _ = buffer.WriteByte(table[pos]) | ||
| } | ||
| _ = buffer.WriteByte('\n') | ||
| } | ||
| return buffer.Bytes() | ||
| } | ||
|
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| func grayscale(c color.Color) int { | ||
| r, g, b, _ := c.RGBA() | ||
| return int(0.299*float64(r) + 0.587*float64(g) + 0.114*float64(b)) | ||
| } | ||
|
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| func getHeight(img image.Image, w int) (image.Image, int, int) { | ||
| sz := img.Bounds() | ||
| height := (sz.Max.Y * w * 10) / (sz.Max.X * 16) | ||
| img = resize.Resize(uint(w), uint(height), img, resize.Lanczos3) | ||
| return img, w, height | ||
| } | ||
|
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| func display(r io.Reader, width int) error { | ||
|
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| img, _, err := image.Decode(r) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| finalASCIIArt := asciiArt(getHeight(img, width)) | ||
| fmt.Println(string(finalASCIIArt)) | ||
| return nil | ||
| } |
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