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engine.go
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engine.go
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package cli
import (
"fmt"
"io/fs"
"os"
"path"
"path/filepath"
"github.com/liampulles/proverb-gen/internal/adapter"
)
const proverbsRelDir = "_proverbs"
var proverbImagesRelDir = path.Join("images", "proverbs")
// --- Engine front-matter ---
type Engine interface {
Run(wd string) error
}
type EngineImpl struct {
gateway adapter.Gateway
}
var _ Engine = &EngineImpl{}
// --- Engine implementation ---
func NewEngineImpl(gateway adapter.Gateway) *EngineImpl {
return &EngineImpl{
gateway: gateway,
}
}
func (e *EngineImpl) Run(wd string) error {
imagePaths, err := e.readImagePaths(wd)
if err != nil {
return err
}
snippetPaths, err := e.readSnippetPaths(wd)
if err != nil {
return err
}
mdBytes, err := e.gateway.GenMarkdown(wd, snippetPaths, imagePaths)
if err != nil {
return fmt.Errorf("adapter error: %w", err)
}
if _, err := os.Stdout.Write(mdBytes); err != nil {
return fmt.Errorf("could not write to stdout: %w", err)
}
return nil
}
func (e *EngineImpl) readSnippetPaths(wd string) ([]string, error) {
proverbsDir := filepath.Join(wd, proverbsRelDir)
var snippetPaths []string
if err := filepath.WalkDir(proverbsDir, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() {
return nil
}
if filepath.Ext(path) == ".html" {
snippetPaths = append(snippetPaths, path)
}
return nil
}); err != nil {
return nil, fmt.Errorf("walk error in %s: %w", wd, err)
}
return snippetPaths, nil
}
func (e *EngineImpl) readImagePaths(wd string) ([]string, error) {
proverbImagesDir := filepath.Join(wd, proverbImagesRelDir)
var imagePaths []string
if err := filepath.WalkDir(proverbImagesDir, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() {
return nil
}
imagePaths = append(imagePaths, path)
return nil
}); err != nil {
return nil, fmt.Errorf("walk error in %s: %w", wd, err)
}
return imagePaths, nil
}