feat: unifood base with GET dishes (#1)

Features:
- CLI structure with verbs and resources
- Application config and parameters
- Output formatters
- Initial resource: dishes

Reviewed-on: #1
Co-authored-by: bdoerfchen <git@bissendorf.co>
Co-committed-by: bdoerfchen <git@bissendorf.co>

.gitignore

@@ -0,0 +1,2 @@
+unifood
+__bin*

.vscode/launch.json

@@ -0,0 +1,19 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug app",
+            "type": "go",
+            "request": "launch",
+            "mode": "debug",
+            "program": "${workspaceFolder}/main.go",
+            "args": [
+                "get", "dishes", 
+                "-o", "yaml", 
+            ]
+        }
+    ]
+}

cmd/config.go

@@ -0,0 +1,7 @@
+package cmd
+
+type AppConfig struct {
+	OutputVerbose   bool
+	OutputFormatter string
+	PrintConfig     bool
+}

cmd/resources.go

@@ -0,0 +1,19 @@
+package cmd
+
+import (
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/handler/dishes"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/services/stwhbclient"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/model/external/stwbremen"
+)
+
+var availableResources = []interfaces.ResourceCommand[any]{
+	{
+		Name:    "dishes",
+		Aliases: []string{"dish", "d"},
+		Verbs:   []interfaces.Verb{interfaces.VerbGet},
+		Handler: &dishes.DishesHandler{
+			QueryClient: stwhbclient.New[[]stwbremen.Dish](),
+		},
+	},
+}

cmd/root.go

@@ -0,0 +1,41 @@
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"os"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/services/jlog"
+	"github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+	Use:   "unifood",
+	Short: "Unifood is a CLI for retrieving restaurant information",
+	Long:  ``,
+	Run: func(cmd *cobra.Command, args []string) {
+	},
+}
+
+func Execute() {
+	initRootCmd()
+
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func initRootCmd() {
+	var appConfig AppConfig
+
+	rootCmd.PersistentFlags().BoolVarP(&appConfig.OutputVerbose, "verbose", "v", false, "Enable verbose output")
+	rootCmd.PersistentFlags().StringVarP(&appConfig.OutputFormatter, "output", "o", "table", "Set output format")
+	rootCmd.PersistentFlags().BoolVar(&appConfig.PrintConfig, "print-config", false, "Enable printing the application config")
+
+	logger := jlog.New(slog.LevelDebug)
+	ctx := jlog.ContextWith(context.Background(), logger)
+
+	rootCmd.AddCommand(getVerbs(ctx, &appConfig)...)
+}

cmd/verbs.go

@@ -0,0 +1,122 @@
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log/slog"
+	"os"
+	"slices"
+	"strings"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces/params"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/output"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/services/jlog"
+	"github.com/spf13/cobra"
+)
+
+type VerbItem struct {
+	Name        interfaces.Verb
+	Aliases     []string
+	Description string
+	RunFn       func(ctx context.Context, config *AppConfig, handler interfaces.ResourceHandler, params params.Container) error
+}
+
+var verbs = []VerbItem{
+	{
+		Name:        interfaces.VerbGet,
+		Description: "Retrieve a list of resources",
+		RunFn: func(ctx context.Context, config *AppConfig, handler interfaces.ResourceHandler, params params.Container) error {
+			h, ok := handler.(interfaces.GetHandler)
+			if !ok {
+				return fmt.Errorf("resource does not support GET")
+			}
+
+			// Get items
+			items, err := h.Get(ctx, params)
+			if err != nil {
+				return fmt.Errorf("retrieving item failed: %w", err)
+			}
+
+			formatterName := strings.ToLower(config.OutputFormatter)
+			formatter, exists := output.Formatters[formatterName]
+			if !exists {
+				return fmt.Errorf("could not find output formatter '%s'", formatterName)
+			}
+
+			// Format and output
+			formatted, err := formatter.Format(items)
+			if err != nil {
+				return fmt.Errorf("failed to format output: %w", err)
+			}
+			_, err = io.Copy(os.Stdout, formatted)
+			if err != nil {
+				return fmt.Errorf("failed to write output: %w", err)
+			}
+
+			return nil
+		},
+	},
+}
+
+func getVerbs(ctx context.Context, config *AppConfig) (commands []*cobra.Command) {
+	for _, v := range verbs {
+		verbCommand := &cobra.Command{
+			Use:     strings.ToLower(string(v.Name)),
+			Aliases: v.Aliases,
+			Short:   v.Description,
+		}
+
+		// Add all resources that can handle this verb
+		for _, r := range availableResources {
+			if !slices.Contains(r.Verbs, v.Name) {
+				continue
+			}
+
+			var params params.Container
+
+			resourceCommand := &cobra.Command{
+				Use:     r.Name,
+				Aliases: r.Aliases,
+				Short:   r.Description,
+				Run: func(cmd *cobra.Command, args []string) {
+					// Configure log
+					var logLevel = slog.LevelWarn
+					if config.OutputVerbose {
+						logLevel = slog.LevelDebug
+					}
+					logger := jlog.New(logLevel)
+					ctx := jlog.ContextWith(context.Background(), logger)
+
+					// Print config
+					if config.PrintConfig {
+						logger.WarnContext(ctx, "Printing app config", slog.Any("config", config), slog.Any("parameters", params.ToMap()))
+					}
+
+					err := v.RunFn(ctx, config, r.Handler, params)
+					if err != nil {
+						logger.ErrorContext(ctx, fmt.Sprintf("%s %s failed", strings.ToUpper(string(v.Name)), r.Name), "error", err.Error())
+						os.Exit(1)
+					}
+				},
+			}
+
+			// Register parameters
+			for _, param := range r.Handler.GetParametersForVerb(v.Name) {
+				resourceCommand.Flags().StringVarP(
+					params.Register(param.Name, param.ParseFunc),
+					param.Name,
+					param.ShortHand,
+					param.DefaultFunc(),
+					param.Description,
+				)
+			}
+			verbCommand.AddCommand(resourceCommand)
+		}
+
+		commands = append(commands, verbCommand)
+	}
+
+	return
+}

core/handler/dishes/handler.go

@@ -0,0 +1,89 @@
+package dishes
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces/params"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/model/external/stwbremen"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/model/resources"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/util"
+)
+
+type DishesHandler struct {
+	interfaces.ResourceHandler
+	interfaces.GetHandler
+
+	QueryClient interfaces.QueryClient[[]stwbremen.Dish]
+}
+
+const (
+	paramDate     = "date"
+	paramLocation = "location"
+)
+
+func (h *DishesHandler) Get(ctx context.Context, params params.Container) (*interfaces.ResourceList, error) {
+	// Read parameters
+	p, err := params.GetValue(paramDate)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse date parameter: %w", err)
+	}
+	date := p.(time.Time)
+
+	location, err := params.GetValue(paramLocation)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse location parameter: %w", err)
+	}
+
+	// Build query
+	query := fmt.Sprintf(
+		`page('meals').children.filterBy('location', '%s').filterBy('date', '%s').filterBy('printonly', 0)`,
+		location,
+		date.Format(time.DateOnly),
+	)
+
+	// Run query
+	dishes, err := h.QueryClient.Get(ctx,
+		query,
+		`{"title":true,"ingredients":"page.ingredients.toObject","prices":"page.prices.toObject","location":true,"counter":true,"date":true,"mealadds":true,"mark":true,"frei3":true,"printonly":true,"kombicategory":true,"categories":"page.categories.split"}`,
+		false,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("querying menu failed: %w", err)
+	}
+
+	// Return
+	return &interfaces.ResourceList{
+		ItemKind: resources.ResourceDish,
+		Items: util.Transform(*dishes, func(i *stwbremen.Dish) interfaces.Resource {
+			d, err := resources.DishFromDTO(*i)
+			if err != nil {
+				return &resources.Dish{}
+			}
+
+			return d
+		}),
+	}, nil
+
+}
+
+func (h *DishesHandler) GetParametersForVerb(verb interfaces.Verb) []params.Registration {
+	return []params.Registration{
+		{
+			Name:        paramDate,
+			ShortHand:   "d",
+			Description: "Menu date",
+			DefaultFunc: func() string { return time.Now().Format(time.DateOnly) },
+			ParseFunc:   func(value string) (any, error) { return time.Parse(time.DateOnly, value) },
+		},
+		{
+			Name:        paramLocation,
+			ShortHand:   "l",
+			Description: "Define the restaurant",
+			DefaultFunc: func() string { return "330" },
+			ParseFunc:   params.ParseString,
+		},
+	}
+}

core/interfaces/handler.go

@@ -0,0 +1,29 @@
+package interfaces
+
+import (
+	"context"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces/params"
+)
+
+type ResourceCommand[T any] struct {
+	Name        string
+	Aliases     []string
+	Description string
+	Verbs       []Verb
+	Handler     ResourceHandler
+}
+
+type ResourceHandler interface {
+	GetParametersForVerb(verb Verb) []params.Registration
+}
+
+type GetHandler interface {
+	Get(ctx context.Context, params params.Container) (*ResourceList, error)
+}
+
+type Verb string
+
+const (
+	VerbGet Verb = "get"
+)

core/interfaces/http.go

@@ -0,0 +1,7 @@
+package interfaces
+
+import "context"
+
+type QueryClient[T any] interface {
+	Get(ctx context.Context, queryStatement string, selectStatement string, allowCache bool) (*T, error)
+}

core/interfaces/output.go

@@ -0,0 +1,14 @@
+package interfaces
+
+import (
+	"io"
+)
+
+type Formatter interface {
+	Format(object *ResourceList) (io.Reader, error)
+}
+
+type TableOutput interface {
+	ColumnNames() []string
+	Columns() []any
+}

core/interfaces/params/params.go

@@ -0,0 +1,69 @@
+package params
+
+import "errors"
+
+var (
+	ErrParamNotFound = errors.New("parameter not found")
+)
+
+type Registration struct {
+	Name        string
+	ShortHand   string
+	Description string
+	DefaultFunc func() string
+	ParseFunc   ParseFn
+}
+
+type ParseFn func(value string) (any, error)
+
+var ParseString ParseFn = func(value string) (any, error) { return value, nil }
+
+type Container struct {
+	params map[string]Value
+}
+
+type Value struct {
+	value   *string
+	parseFn ParseFn
+}
+
+func (c *Container) Register(key string, parseFn ParseFn) *string {
+	if c.params == nil {
+		c.params = make(map[string]Value)
+	}
+
+	item, exists := c.params[key]
+	if exists {
+		return item.value
+	}
+
+	var str string
+	value := Value{
+		parseFn: parseFn,
+		value:   &str,
+	}
+	c.params[key] = value
+	return value.value
+}
+
+func (c *Container) GetValue(key string) (any, error) {
+	item, exists := c.params[key]
+	if !exists {
+		return nil, ErrParamNotFound
+	}
+
+	return item.parseFn(*item.value)
+}
+
+// Returns a map of all parameters. Parameters that produce errors during parsing are ignored.
+func (c *Container) ToMap() (out map[string]any) {
+	out = make(map[string]any)
+	for key := range c.params {
+		v, err := c.GetValue(key)
+		if err == nil {
+			out[key] = v
+		}
+	}
+
+	return
+}

core/interfaces/resource.go

@@ -0,0 +1,12 @@
+package interfaces
+
+type Resource interface {
+	Kind() string
+
+	Name() string
+}
+
+type ResourceList struct {
+	ItemKind string
+	Items    []Resource
+}

core/output/formatter.go

@@ -0,0 +1,15 @@
+package output
+
+import (
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+)
+
+var Formatters = map[string]interfaces.Formatter{
+	"json":     &JsonFormatter{},
+	"yaml":     &YamlFormatter{},
+	"go":       &GoFormatter{},
+	"table":    &TableFormatter{},
+	"csv":      &TableFormatter{HideSummary: true, RenderFormat: tableFormatCSV},
+	"html":     &TableFormatter{HideSummary: true, RenderFormat: tableFormatHTML},
+	"markdown": &TableFormatter{HideSummary: true, RenderFormat: tableFormatMarkdown},
+}

core/output/go.go

@@ -0,0 +1,15 @@
+package output
+
+import (
+	"fmt"
+	"io"
+	"strings"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+)
+
+type GoFormatter struct{}
+
+func (f *GoFormatter) Format(list *interfaces.ResourceList) (io.Reader, error) {
+	return strings.NewReader(fmt.Sprintf("%#v", list)), nil
+}

core/output/json.go

@@ -0,0 +1,17 @@
+package output
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+)
+
+type JsonFormatter struct{}
+
+func (f *JsonFormatter) Format(list *interfaces.ResourceList) (io.Reader, error) {
+	var buffer = make([]byte, 0, 1024)
+	outputBuffer := bytes.NewBuffer(buffer)
+	return outputBuffer, json.NewEncoder(outputBuffer).Encode(list)
+}

core/output/table.go

@@ -0,0 +1,81 @@
+package output
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/util"
+	"github.com/jedib0t/go-pretty/table"
+)
+
+type tableRenderFormat string
+
+const (
+	tableFormatNormal   tableRenderFormat = "table"
+	tableFormatCSV      tableRenderFormat = "csv"
+	tableFormatHTML     tableRenderFormat = "html"
+	tableFormatMarkdown tableRenderFormat = "markdown"
+)
+
+type TableFormatter struct {
+	HideSummary  bool
+	RenderFormat tableRenderFormat
+}
+
+func (f *TableFormatter) Format(list *interfaces.ResourceList) (io.Reader, error) {
+
+	var buffer = make([]byte, 0, 1024)
+	outputBuffer := bytes.NewBuffer(buffer)
+
+	if !f.HideSummary {
+		outputBuffer.WriteString(
+			fmt.Sprintf("Resource: %s\r\nCount: %v\r\n\r\n", list.ItemKind, len(list.Items)),
+		)
+	}
+
+	if len(list.Items) <= 0 {
+		return outputBuffer, nil
+	}
+
+	// Setup table
+	t := table.NewWriter()
+	t.SetOutputMirror(outputBuffer)
+	t.SetStyle(table.StyleLight)
+
+	// Write header
+	tableFormat, ok := list.Items[0].(interfaces.TableOutput)
+	headerRow := []any{"Name"}
+	if ok {
+		columnHeaders := util.Transform(tableFormat.ColumnNames(), func(i *string) any { return *i })
+		headerRow = append(headerRow, columnHeaders...)
+	}
+	t.AppendHeader(headerRow)
+
+	// Write rows
+	for _, item := range list.Items {
+		rowOutput := []any{item.Name()}
+
+		itemFormatter, ok := item.(interfaces.TableOutput)
+		if ok {
+			rowOutput = append(rowOutput, itemFormatter.Columns()...)
+		}
+
+		t.AppendRow(rowOutput)
+	}
+
+	// Render
+	switch f.RenderFormat {
+	case tableFormatCSV:
+		t.RenderCSV()
+	case tableFormatHTML:
+		t.RenderHTML()
+	case tableFormatMarkdown:
+		t.RenderMarkdown()
+	default:
+		t.Render()
+	}
+
+	return outputBuffer, nil
+}

core/output/yaml.go

@@ -0,0 +1,20 @@
+package output
+
+import (
+	"bytes"
+	"io"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+	"github.com/goccy/go-yaml"
+)
+
+type YamlFormatter struct{}
+
+func (f *YamlFormatter) Format(list *interfaces.ResourceList) (io.Reader, error) {
+	buffer, err := yaml.Marshal(list)
+	if err != nil {
+		return nil, err
+	}
+
+	return bytes.NewBuffer(buffer), nil
+}

core/services/jlog/context.go

@@ -0,0 +1,23 @@
+package jlog
+
+import (
+	"context"
+	"log/slog"
+)
+
+type ctxKey string
+
+const ctxkeyLogger ctxKey = "jlog:logger"
+
+func FromContext(ctx context.Context) *slog.Logger {
+	logger, exists := ctx.Value(ctxkeyLogger).(*slog.Logger)
+	if !exists {
+		return New(slog.LevelInfo)
+	}
+
+	return logger
+}
+
+func ContextWith(ctx context.Context, logger *slog.Logger) context.Context {
+	return context.WithValue(ctx, ctxkeyLogger, logger)
+}

core/services/jlog/logger.go

@@ -0,0 +1,24 @@
+package jlog
+
+import (
+	"io"
+	"log/slog"
+	"math/rand"
+	"os"
+	"strconv"
+)
+
+func New(level slog.Level) *slog.Logger {
+	return NewFor(level, os.Stderr)
+}
+
+func NewFor(level slog.Level, output io.Writer) *slog.Logger {
+	return slog.New(slog.NewJSONHandler(output, &slog.HandlerOptions{
+		// AddSource: true,
+		Level: level,
+	})).With(slog.String("traceid", newTraceID()))
+}
+
+func newTraceID() string {
+	return strconv.Itoa(rand.Intn(1000000))
+}

core/services/stwhbclient/client.go

@@ -0,0 +1,66 @@
+package stwhbclient
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/model/external/stwbremen"
+)
+
+type stwHBClientFactory struct{}
+
+func NewFactory() *stwHBClientFactory { return &stwHBClientFactory{} }
+
+func Create[T any]() *stwHBClient[T] {
+	return New[T]()
+}
+
+type stwHBClient[T any] struct {
+	interfaces.QueryClient[T]
+
+	client  *http.Client
+	baseUrl string
+}
+
+func New[T any]() *stwHBClient[T] {
+	return &stwHBClient[T]{
+		client:  http.DefaultClient,
+		baseUrl: "https://content.stw-bremen.de",
+	}
+}
+
+func (c *stwHBClient[T]) Get(ctx context.Context, queryStatement string, selectStatement string, allowCache bool) (*T, error) {
+	// Setup url
+	url := c.baseUrl + "/api/kql"
+	if !allowCache {
+		url = url + "nocache"
+	}
+
+	// Create request from query
+	fullQuery := fmt.Sprintf(`{"query": "%s", "select": %s}`, queryStatement, selectStatement)
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, strings.NewReader(fullQuery))
+	if err != nil {
+		return nil, fmt.Errorf("unable to create request: %w", err)
+	}
+
+	// Perform request
+	response, err := c.client.Do(req)
+	if err != nil || response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("performing request failed: %w", err)
+	}
+	defer response.Body.Close()
+
+	// Read response
+	var result stwbremen.Result[T]
+	err = json.NewDecoder(response.Body).Decode(&result)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse result: %w", err)
+	}
+
+	return &result.Result, nil
+
+}

go.mod

@@ -0,0 +1,25 @@
+module git.bissendorf.co/bissendorf/unifood/m/v2
+
+go 1.24.0
+
+require (
+	github.com/goccy/go-yaml v1.18.0
+	github.com/jedib0t/go-pretty v4.3.0+incompatible
+	github.com/spf13/cobra v1.9.1
+)
+
+require (
+	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
+	github.com/go-openapi/errors v0.22.0 // indirect
+	github.com/go-openapi/strfmt v0.23.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/oklog/ulid v1.3.1 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/spf13/pflag v1.0.7 // indirect
+	github.com/stretchr/testify v1.10.0 // indirect
+	go.mongodb.org/mongo-driver v1.14.0 // indirect
+	golang.org/x/sys v0.30.0 // indirect
+)

go.sum

@@ -0,0 +1,45 @@
+github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3dyBCFEj5IhUbnKptjxatkF07cF2ak3yi77so=
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main.go

@@ -0,0 +1,7 @@
+package main
+
+import "git.bissendorf.co/bissendorf/unifood/m/v2/cmd"
+
+func main() {
+	cmd.Execute()
+}

model/external/stwbremen/dish.go

@@ -0,0 +1,21 @@
+package stwbremen
+
+type Dish struct {
+	Title       string       `json:"title"`
+	Ingredients []Ingredient `json:"ingredients"`
+	Prices      []Price      `json:"prices"`
+	Location    string       `json:"location"`
+	Date        string       `json:"date"` // YYYY-MM-DD
+	Counter     string       `json:"counter"`
+	Tags        string       `json:"mealadds"`
+}
+
+type Ingredient struct {
+	Label       string   `json:"label"`
+	Additionals []string `json:"additionals"`
+}
+
+type Price struct {
+	Label string `json:"label"`
+	Price string `json:"price"`
+}

model/external/stwbremen/result.go

@@ -0,0 +1,7 @@
+package stwbremen
+
+type Result[T any] struct {
+	Code   uint16 `json:"code"`
+	Status string `json:"status"`
+	Result T      `json:"result"`
+}

model/resources/dish.go

@@ -0,0 +1,64 @@
+package resources
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/model/external/stwbremen"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/util"
+)
+
+func DishFromDTO(dish stwbremen.Dish) (*Dish, error) {
+	date, err := time.Parse(time.DateOnly, dish.Date)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse dish date: %w", err)
+	}
+
+	return &Dish{
+		Title:    dish.Title,
+		Location: dish.Location,
+		Date:     date,
+		Tags:     strings.Split(strings.Replace(dish.Tags, " ", "", -1), ","),
+		Counter:  dish.Counter,
+		Prices: util.Map(dish.Prices, func(i *stwbremen.Price) (string, float32) {
+			p, err := strconv.ParseFloat(strings.Trim(i.Price, " "), 32)
+			if err != nil {
+				p = 0
+			}
+			return i.Label, float32(p)
+		}),
+		Ingredients: util.Select(util.Transform(dish.Ingredients, func(i *stwbremen.Ingredient) ingredient {
+			return ingredient{
+				Name:        i.Label,
+				Additionals: i.Additionals,
+			}
+		}), func(i *ingredient) bool { return i.Name != "" }),
+	}, nil
+}
+
+const ResourceDish = "dish"
+
+type Dish struct {
+	Title       string
+	Location    string
+	Ingredients []ingredient
+	Prices      map[string]float32
+	Date        time.Time
+	Counter     string
+	Tags        []string
+}
+
+type ingredient struct {
+	Name        string
+	Additionals []string
+}
+
+func (d *Dish) Kind() string { return ResourceDish }
+func (d *Dish) Name() string { return d.Title }
+
+func (d *Dish) ColumnNames() []string { return []string{"Location", "Date", "Counter", "Price"} }
+func (d *Dish) Columns() []any {
+	return []any{d.Location, d.Date.Format(time.DateOnly), d.Counter, d.Prices["Studierende"]}
+}

util/slices.go

@@ -0,0 +1,33 @@
+package util
+
+func Transform[Tin any, Tout any](s []Tin, transformFn func(i *Tin) Tout) (out []Tout) {
+	out = make([]Tout, 0)
+
+	for _, item := range s {
+		out = append(out, transformFn(&item))
+	}
+
+	return
+}
+
+func Select[T any](s []T, selectFn func(i *T) bool) (out []T) {
+	out = make([]T, 0)
+
+	for _, item := range s {
+		if selectFn(&item) {
+			out = append(out, item)
+		}
+	}
+
+	return
+}
+
+func Map[T any, Tkey comparable, Tval any](s []T, transformFn func(i *T) (Tkey, Tval)) (out map[Tkey]Tval) {
+	out = make(map[Tkey]Tval)
+	for _, i := range s {
+		key, val := transformFn(&i)
+		out[key] = val
+	}
+
+	return
+}