bump version (feature update)

* added environment variable support
* added docker instructions
* added .env hint

Dockerfile

@@ -16,8 +16,6 @@ RUN make
 FROM alpine:latest
 LABEL maintainer="Thomas von Dein <git@daemon.de>"
 
-#RUN install -o 1001 -g 1001 -d /data
-
 WORKDIR /app
 COPY --from=builder /work/kleingebaeck /app/kleingebaeck
 

README.md

@@ -106,9 +106,16 @@ USER_ID=$(id -u) GROUP_ID=$(id -g) OUTDIR=./kleinanzeigen-backup docker-compose
 ```
 
 `USER_ID` and  `GROUP_ID` needs to  be specified  so that you  are the
-owner of the created backups. The backup directory must exist prior to
-the  execution,  otherwise  docker  will   create  it  as  root,  then
-kleingebaeck will fail.
+owner of the created backups. The backup directory `OUTDIR` must exist
+prior to the execution, otherwise docker  will create it as root, then
+kleingebaeck will  fail. You may  also use a  `.env` file in  the same
+directory containing the variables, such as:
+
+```
+USER_ID=1000
+GROUP_ID=1000
+OUTDIR=./kleinanzeigen-backup
+```
 
 You may of course also modify the `docker-compose.yaml` to suit your needs.
 

ad.go

@@ -20,6 +20,7 @@ package main
 import (
 	"log/slog"
 	"strings"
+	"time"
 )
 
 type Index struct {
@@ -37,6 +38,7 @@ type Ad struct {
 	Created      string   `goquery:"#viewad-extra-info,text"`
 	Text         string   `goquery:"p#viewad-description-text,html"`
 	Images       []string `goquery:".galleryimage-element img,[src]"`
+	Expire       string
 }
 
 // Used by slog to pretty print an ad
@@ -49,6 +51,8 @@ func (ad *Ad) LogValue() slog.Value {
 		slog.Int("bodysize", len(ad.Text)),
 		slog.String("categorytree", strings.Join(ad.CategoryTree, "+")),
 		slog.String("condition", ad.Condition),
+		slog.String("created", ad.Created),
+		slog.String("expire", ad.Expire),
 	)
 }
 
@@ -67,3 +71,12 @@ func (ad *Ad) Incomplete() bool {
 
 	return false
 }
+
+func (ad *Ad) CalculateExpire() {
+	if len(ad.Created) > 0 {
+		ts, err := time.Parse("02.01.2006", ad.Created)
+		if err == nil {
+			ad.Expire = ts.AddDate(0, 2, 1).Format("02.01.2006")
+		}
+	}
+}

config.go

@@ -35,14 +35,16 @@ import (
 )
 
 const (
-	VERSION         string = "0.1.2"
+	VERSION         string = "0.3.0"
 	Baseuri         string = "https://www.kleinanzeigen.de"
 	Listuri         string = "/s-bestandsliste.html"
 	Defaultdir      string = "."
 	DefaultTemplate string = "Title: {{.Title}}\nPrice: {{.Price}}\nId: {{.Id}}\n" +
-		"Category: {{.Category}}\nCondition: {{.Condition}}\nCreated: {{.Created}}\n\n{{.Text}}\n"
+		"Category: {{.Category}}\nCondition: {{.Condition}}\n" +
+		"Created: {{.Created}}\nExpire: {{.Expire}}\n\n{{.Text}}\n"
 	DefaultTemplateWin string = "Title: {{.Title}}\r\nPrice: {{.Price}}\r\nId: {{.Id}}\r\n" +
-		"Category: {{.Category}}\r\nCondition: {{.Condition}}\r\nCreated: {{.Created}}\r\n\r\n{{.Text}}\r\n"
+		"Category: {{.Category}}\r\nCondition: {{.Condition}}\r\n" +
+		"Created: {{.Created}}\r\nExpires: {{.Expire}}\r\n\r\n{{.Text}}\r\n"
 	Useragent string = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) " +
 		"AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
 	DefaultAdNameTemplate string = "{{.Slug}}"
@@ -60,6 +62,7 @@ Options:
 -l --limit   <num>      Limit the ads to download to <num>, default: load all.
 -c --config  <file>     Use config file <file> (default: ~/.kleingebaeck).
    --ignoreerrors       Ignore HTTP errors, may lead to incomplete ad backup.
+-f --force              Download images even if they already exist.
 -m --manual             Show manual.
 -h --help               Show usage.
 -V --version            Show program version.
@@ -80,6 +83,7 @@ type Config struct {
 	Loglevel         string `koanf:"loglevel"`
 	Limit            int    `koanf:"limit"`
 	IgnoreErrors     bool   `koanf:"ignoreerrors"`
+	ForceDownload    bool   `koanf:"force"`
 	Adlinks          []string
 	StatsCountAds    int
 	StatsCountImages int
@@ -131,6 +135,7 @@ func InitConfig(w io.Writer) (*Config, error) {
 	f.BoolP("version", "V", false, "show program version")
 	f.BoolP("help", "h", false, "show usage")
 	f.BoolP("manual", "m", false, "show manual")
+	f.BoolP("force", "f", false, "force")
 
 	if err := f.Parse(os.Args[1:]); err != nil {
 		return nil, err

go.mod

@@ -7,26 +7,32 @@ require (
 	github.com/jarcoal/httpmock v1.3.1
 	github.com/knadh/koanf/parsers/toml v0.1.0
 	github.com/knadh/koanf/providers/confmap v0.1.0
+	github.com/knadh/koanf/providers/env v0.1.0
 	github.com/knadh/koanf/providers/file v0.1.0
 	github.com/knadh/koanf/providers/posflag v0.1.0
 	github.com/knadh/koanf/v2 v2.0.1
-	github.com/lmittmann/tint v1.0.3
+	github.com/lmittmann/tint v1.0.4
 	github.com/mattn/go-isatty v0.0.20
 	github.com/spf13/pflag v1.0.5
+	github.com/tlinden/yadu v0.1.0
 	golang.org/x/sync v0.5.0
 )
 
 require (
-	github.com/PuerkitoBio/goquery v1.5.0 // indirect
-	github.com/andybalholm/cascadia v1.0.0 // indirect
+	github.com/PuerkitoBio/goquery v1.5.1 // indirect
+	github.com/andybalholm/cascadia v1.1.0 // indirect
+	github.com/corona10/goimagehash v1.1.0 // indirect
+	github.com/fatih/color v1.16.0 // indirect
 	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/knadh/koanf/maps v0.1.1 // indirect
-	github.com/knadh/koanf/providers/env v0.1.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 // indirect
 	github.com/pelletier/go-toml v1.9.5 // indirect
 	golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect
-	golang.org/x/sys v0.6.0 // indirect
+	golang.org/x/sys v0.14.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 
 )

go.sum

@@ -1,12 +1,18 @@
 astuart.co/goq v1.0.0 h1:nnYIhu/Z/j0VaX9Dp+pmh2Uh7ldEz6XfgSg+bAY5Yrw=
 astuart.co/goq v1.0.0/go.mod h1:+fokcnFrO8Pw2fj8drdStJvzoMFebJH69rw8IC21rno=
-github.com/PuerkitoBio/goquery v1.5.0 h1:uGvmFXOA73IKluu/F84Xd1tt/z07GYm8X49XKHP7EJk=
 github.com/PuerkitoBio/goquery v1.5.0/go.mod h1:qD2PgZ9lccMbQlc7eEOjaeRlFQON7xY8kdmcsrnKqMg=
-github.com/andybalholm/cascadia v1.0.0 h1:hOCXnnZ5A+3eVDX8pvgl4kofXv2ELss0bKcqRySc45o=
+github.com/PuerkitoBio/goquery v1.5.1 h1:PSPBGne8NIUWw+/7vFBV+kG2J/5MOjbzc7154OaKCSE=
+github.com/PuerkitoBio/goquery v1.5.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc=
 github.com/andybalholm/cascadia v1.0.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
+github.com/andybalholm/cascadia v1.1.0 h1:BuuO6sSfQNFRu1LppgbD25Hr2vLYW25JvxHs5zzsLTo=
+github.com/andybalholm/cascadia v1.1.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
+github.com/corona10/goimagehash v1.1.0 h1:teNMX/1e+Wn/AYSbLHX8mj+mF9r60R1kBeqE9MkoYwI=
+github.com/corona10/goimagehash v1.1.0/go.mod h1:VkvE0mLn84L4aF8vCb6mafVajEb6QYMHl2ZJLn0mOGI=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fatih/color v1.16.0 h1:zmkK9Ngbjj+K0yRhTVONQh1p/HknKYSlNT+vZCzyokM=
+github.com/fatih/color v1.16.0/go.mod h1:fL2Sau1YI5c0pdGEVCbKQbLXB6edEj1ZgiY4NijnWvE=
 github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
 github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
 github.com/jarcoal/httpmock v1.3.1 h1:iUx3whfZWVf3jT01hQTO/Eo5sAYtB2/rqaUuOtpInww=
@@ -25,8 +31,11 @@ github.com/knadh/koanf/providers/posflag v0.1.0 h1:mKJlLrKPcAP7Ootf4pBZWJ6J+4wHY
 github.com/knadh/koanf/providers/posflag v0.1.0/go.mod h1:SYg03v/t8ISBNrMBRMlojH8OsKowbkXV7giIbBVgbz0=
 github.com/knadh/koanf/v2 v2.0.1 h1:1dYGITt1I23x8cfx8ZnldtezdyaZtfAuRtIFOiRzK7g=
 github.com/knadh/koanf/v2 v2.0.1/go.mod h1:ZeiIlIDXTE7w1lMT6UVcNiRAS2/rCeLn/GdLNvY1Dus=
-github.com/lmittmann/tint v1.0.3 h1:W5PHeA2D8bBJVvabNfQD/XW9HPLZK1XoPZH0cq8NouQ=
-github.com/lmittmann/tint v1.0.3/go.mod h1:HIS3gSy7qNwGCj+5oRjAutErFBl4BzdQP6cJZ0NfMwE=
+github.com/lmittmann/tint v1.0.4 h1:LeYihpJ9hyGvE0w+K2okPTGUdVLfng1+nDNVR4vWISc=
+github.com/lmittmann/tint v1.0.4/go.mod h1:HIS3gSy7qNwGCj+5oRjAutErFBl4BzdQP6cJZ0NfMwE=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/maxatome/go-testdeep v1.12.0 h1:Ql7Go8Tg0C1D/uMMX59LAoYK7LffeJQ6X2T04nTH68g=
@@ -37,6 +46,8 @@ github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyua
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zxSIeXaQ=
 github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
 github.com/pelletier/go-toml v1.9.5 h1:4yBQzkHv+7BHq2PQUZF3Mx0IYxG7LsP222s7Agd3ve8=
 github.com/pelletier/go-toml v1.9.5/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -47,18 +58,27 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+github.com/tlinden/yadu v0.0.0-20240118202225-ec3f0b7fc355 h1:EmgK+IGUz2m42bFKteLY5SYJLn/CyBrz6nkgS22K8Bk=
+github.com/tlinden/yadu v0.0.0-20240118202225-ec3f0b7fc355/go.mod h1:l3bRmHKL9zGAR6pnBHY2HRPxBecf7L74BoBgOOpTcUA=
+github.com/tlinden/yadu v0.1.0 h1:qtCi1jxg392qVRLFyrJ2LYu6/PiKSp1LT02EX+mNLME=
+github.com/tlinden/yadu v0.1.0/go.mod h1:l3bRmHKL9zGAR6pnBHY2HRPxBecf7L74BoBgOOpTcUA=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/net v0.0.0-20180218175443-cbe0f9307d01/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190606173856-1492cefac77f/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
+golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b h1:PxfKdU9lEEDYjdIzOtC4qFWgkU2rGHdKlKowJSMN9h0=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
 golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220908164124-27713097b956/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
+golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

image.go

@@ -0,0 +1,142 @@
+/*
+Copyright © 2023-2024 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"bytes"
+	"image/jpeg"
+	"log/slog"
+	"os"
+	"path/filepath"
+
+	"github.com/corona10/goimagehash"
+)
+
+const MaxDistance = 3
+
+type Image struct {
+	Filename string
+	Hash     *goimagehash.ImageHash
+	Data     *bytes.Buffer
+	Uri      string
+}
+
+// used for logging to avoid printing Data
+func (img *Image) LogValue() slog.Value {
+	return slog.GroupValue(
+		slog.String("filename", img.Filename),
+		slog.String("uri", img.Uri),
+		slog.String("hash", img.Hash.ToString()),
+	)
+}
+
+// holds all images of an ad
+type Cache []*goimagehash.ImageHash
+
+func NewImage(buf *bytes.Buffer, filename string, uri string) *Image {
+	img := &Image{
+		Filename: filename,
+		Uri:      uri,
+		Data:     buf,
+	}
+
+	return img
+}
+
+// Calculate diff hash of the image
+func (img *Image) CalcHash() error {
+	jpgdata, err := jpeg.Decode(img.Data)
+	if err != nil {
+		return err
+	}
+
+	hash1, err := goimagehash.DifferenceHash(jpgdata)
+	if err != nil {
+		return err
+	}
+
+	img.Hash = hash1
+
+	return nil
+}
+
+// checks if 2 images are similar enough to be considered the same
+func (img *Image) Similar(hash *goimagehash.ImageHash) bool {
+	distance, err := img.Hash.Distance(hash)
+	if err != nil {
+		slog.Debug("failed to compute diff hash distance", "error", err)
+		return false
+	}
+
+	if distance < MaxDistance {
+		slog.Debug("distance computation", "image-A", img.Hash.ToString(),
+			"image-B", hash.ToString(), "distance", distance)
+		return true
+	} else {
+		return false
+	}
+}
+
+// check current image against all known hashes.
+func (img *Image) SimilarExists(cache Cache) bool {
+	for _, otherimg := range cache {
+		if img.Similar(otherimg) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// read all  JPG images  in a  ad directory,  compute diff  hashes and
+// store the results in the slice Images
+func ReadImages(addir string, dont bool) (Cache, error) {
+	files, err := os.ReadDir(addir)
+	if err != nil {
+		return nil, err
+	}
+
+	cache := Cache{}
+
+	if dont {
+		// forced download, -f given
+		return cache, nil
+	}
+
+	for _, file := range files {
+		ext := filepath.Ext(file.Name())
+		if !file.IsDir() && (ext == ".jpg" || ext == ".jpeg" || ext == ".JPG" || ext == ".JPEG") {
+			filename := filepath.Join(addir, file.Name())
+			data, err := ReadImage(filename)
+			if err != nil {
+				return nil, err
+			}
+
+			img := NewImage(data, filename, "")
+			if err = img.CalcHash(); err != nil {
+				return nil, err
+			}
+
+			slog.Debug("Caching image from file system", "image", img, "hash", img.Hash.ToString())
+			cache = append(cache, img.Hash)
+		}
+	}
+
+	//return nil, errors.New("ende")
+	return cache, nil
+}

kleingebaeck.1

@@ -133,7 +133,7 @@
 .\" ========================================================================
 .\"
 .IX Title "KLEINGEBAECK 1"
-.TH KLEINGEBAECK 1 "2024-01-17" "1" "User Commands"
+.TH KLEINGEBAECK 1 "2024-01-22" "1" "User Commands"
 .\" For nroff, turn off justification.  Always turn off hyphenation; it makes
 .\" way too many mistakes in technical documents.
 .if n .ad l
@@ -142,7 +142,7 @@
 kleingebaeck \- kleinanzeigen.de backup tool
 .SH "SYNOPSYS"
 .IX Header "SYNOPSYS"
-.Vb 12
+.Vb 10
 \&    Usage: kleingebaeck [\-dvVhmoc] [<ad\-listing\-url>,...]
 \&    Options:
 \&    \-u \-\-user    <uid>      Backup ads from user with uid <uid>.
@@ -152,6 +152,7 @@ kleingebaeck \- kleinanzeigen.de backup tool
 \&    \-l \-\-limit   <num>      Limit the ads to download to <num>, default: load all.
 \&    \-c \-\-config  <file>     Use config file <file> (default: ~/.kleingebaeck).
 \&       \-\-ignoreerrors       Ignore HTTP errors, may lead to incomplete ad backup.
+\&    \-f \-\-force              Download images even if they already exist.
 \&    \-m \-\-manual             Show manual.
 \&    \-h \-\-help               Show usage.
 \&    \-V \-\-version            Show program version.

kleingebaeck.go

@@ -14,6 +14,7 @@ SYNOPSYS
         -l --limit   <num>      Limit the ads to download to <num>, default: load all.
         -c --config  <file>     Use config file <file> (default: ~/.kleingebaeck).
            --ignoreerrors       Ignore HTTP errors, may lead to incomplete ad backup.
+        -f --force              Download images even if they already exist.
         -m --manual             Show manual.
         -h --help               Show usage.
         -V --version            Show program version.

kleingebaeck.pod

@@ -13,6 +13,7 @@ kleingebaeck - kleinanzeigen.de backup tool
     -l --limit   <num>      Limit the ads to download to <num>, default: load all.
     -c --config  <file>     Use config file <file> (default: ~/.kleingebaeck).
        --ignoreerrors       Ignore HTTP errors, may lead to incomplete ad backup.
+    -f --force              Download images even if they already exist.
     -m --manual             Show manual.
     -h --help               Show usage.
     -V --version            Show program version.

main.go

@@ -26,6 +26,7 @@ import (
 	"runtime/debug"
 
 	"github.com/lmittmann/tint"
+	"github.com/tlinden/yadu"
 )
 
 const LevelNotice = slog.Level(2)
@@ -84,14 +85,14 @@ func Main(w io.Writer) int {
 	if conf.Debug {
 		// we're using a more verbose logger in debug mode
 		buildInfo, _ := debug.ReadBuildInfo()
-		opts := &tint.Options{
+		opts := &yadu.Options{
 			Level:     logLevel,
 			AddSource: true,
-			NoColor:   IsNoTty(),
+			//NoColor:   IsNoTty(),
 		}
 
 		logLevel.Set(slog.LevelDebug)
-		handler := tint.NewHandler(w, opts)
+		handler := yadu.NewHandler(w, opts)
 		debuglogger := slog.New(handler).With(
 			slog.Group("program_info",
 				slog.Int("pid", os.Getpid()),

main_test.go

@@ -145,7 +145,13 @@ var tests = []Tests{
 	{
 		name:     "debug",
 		args:     base + " -d",
-		expect:   "program_info",
+		expect:   "error: invalid or no user id or no ad link specified",
+		exitcode: 1,
+	},
+	{
+		name:     "debug-check-programinfo",
+		args:     base + " -d",
+		expect:   "pid:",
 		exitcode: 1,
 	},
 	{
@@ -169,7 +175,7 @@ var tests = []Tests{
 	{
 		name:     "download-single-ad-debug",
 		args:     base + " -o t/out https://www.kleinanzeigen.de/s-anzeige/first-ad/1 -d",
-		expect:   "extracted ad listing program_info.pid=",
+		expect:   "DEBUG: extracted ad listing",
 		exitcode: 0,
 	},
 	{

scrape.go

@@ -18,6 +18,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package main
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
 	"log/slog"
@@ -117,7 +118,7 @@ func ScrapeAd(fetch *Fetcher, uri string) error {
 		return errors.New("could not extract ad data from page, got empty struct")
 	}
 
-	slog.Debug("extracted ad listing", "ad", ad)
+	ad.CalculateExpire()
 
 	// write listing
 	addir, err := WriteAd(fetch.Config, ad)
@@ -125,6 +126,8 @@ func ScrapeAd(fetch *Fetcher, uri string) error {
 		return err
 	}
 
+	slog.Debug("extracted ad listing", "ad", ad)
+
 	fetch.Config.IncrAds()
 
 	return ScrapeImages(fetch, ad, addir)
@@ -133,22 +136,52 @@ func ScrapeAd(fetch *Fetcher, uri string) error {
 func ScrapeImages(fetch *Fetcher, ad *Ad, addir string) error {
 	// fetch images
 	img := 1
+	adpath := filepath.Join(fetch.Config.Outdir, addir)
+
+	// scan existing images, if any
+	cache, err := ReadImages(adpath, fetch.Config.ForceDownload)
+	if err != nil {
+		return err
+	}
+
 	g := new(errgroup.Group)
 
 	for _, imguri := range ad.Images {
 		imguri := imguri
-		file := filepath.Join(fetch.Config.Outdir, addir, fmt.Sprintf("%d.jpg", img))
+		file := filepath.Join(adpath, fmt.Sprintf("%d.jpg", img))
 		g.Go(func() error {
 			body, err := fetch.Getimage(imguri)
 			if err != nil {
 				return err
 			}
 
-			err = WriteImage(file, body)
+			buf := new(bytes.Buffer)
+			_, err = buf.ReadFrom(body)
 			if err != nil {
 				return err
 			}
 
+			buf2 := buf.Bytes() // needed for image writing
+
+			image := NewImage(buf, "", imguri)
+			err = image.CalcHash()
+			if err != nil {
+				return err
+			}
+
+			if !fetch.Config.ForceDownload {
+				if image.SimilarExists(cache) {
+					slog.Debug("similar image exists, not written", "uri", image.Uri)
+					return nil
+				}
+			}
+
+			err = WriteImage(file, buf2)
+			if err != nil {
+				return err
+			}
+
+			slog.Debug("wrote image", "image", image, "size", len(buf2))
 			return nil
 		})
 		img++

store.go

@@ -19,7 +19,7 @@ package main
 
 import (
 	"bytes"
-	"io"
+	"fmt"
 	"log/slog"
 	"os"
 	"path/filepath"
@@ -86,17 +86,46 @@ func WriteAd(c *Config, ad *Ad) (string, error) {
 	return addir, nil
 }
 
-func WriteImage(filename string, reader io.ReadCloser) error {
+func WriteImage(filename string, buf []byte) error {
 	file, err := os.Create(filename)
 	if err != nil {
 		return err
 	}
 	defer file.Close()
 
-	_, err = io.Copy(file, reader)
+	_, err = file.Write(buf)
+
 	if err != nil {
 		return err
 	}
 
 	return nil
 }
+
+func ReadImage(filename string) (*bytes.Buffer, error) {
+	var buf bytes.Buffer
+
+	if !fileExists(filename) {
+		return nil, fmt.Errorf("image %s does not exist", filename)
+	}
+
+	data, err := os.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = buf.Write(data)
+	if err != nil {
+		return nil, err
+	}
+
+	return &buf, nil
+}
+
+func fileExists(filename string) bool {
+	info, err := os.Stat(filename)
+	if os.IsNotExist(err) {
+		return false
+	}
+	return !info.IsDir()
+}