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package yaml
import (
"fmt"
"io/ioutil"
"gopkg.in/yaml.v3"
C "github.com/Necoro/feed2imap-go/internal/config"
F "github.com/Necoro/feed2imap-go/internal/feed"
)
type config struct {
C.GlobalOptions `yaml:",inline"`
GlobalConfig C.Map `yaml:",inline"`
Feeds []configGroupFeed
}
type group struct {
Group string
Feeds []configGroupFeed
}
type feed struct {
Name string
Url string
C.Options `yaml:",inline"`
}
type configGroupFeed struct {
Target *string
Feed feed `yaml:",inline"`
Group group `yaml:",inline"`
}
func (grpFeed *configGroupFeed) isGroup() bool {
return grpFeed.Group.Group != ""
}
func (grpFeed *configGroupFeed) isFeed() bool {
return grpFeed.Feed.Name != "" || grpFeed.Feed.Url != ""
}
func (grpFeed *configGroupFeed) target() string {
if grpFeed.Target != nil {
return *grpFeed.Target
}
if grpFeed.Feed.Name != "" {
return grpFeed.Feed.Name
}
return grpFeed.Group.Group
}
func parse(buf []byte) (config, error) {
parsedCfg := config{GlobalOptions: C.DefaultGlobalOptions}
if err := yaml.Unmarshal(buf, &parsedCfg); err != nil {
return config{}, fmt.Errorf("while unmarshalling: %w", err)
}
//fmt.Printf("--- parsedCfg:\n%+v\n\n", parsedCfg)
return parsedCfg, nil
}
func appTarget(target []string, app string) []string {
switch {
case len(target) == 0 && app == "":
return []string{}
case len(target) == 0:
return []string{app}
case app == "":
return target
default:
return append(target, app)
}
}
// Parse the group structure and populate the `Target` fields in the feeds
func buildFeeds(cfg []configGroupFeed, target []string, feeds F.Feeds) error {
for idx := range cfg {
f := &cfg[idx] // cannot use `_, f := range cfg` as it returns copies(!), but we need the originals
target := appTarget(target, f.target())
switch {
case f.isFeed() && f.isGroup():
return fmt.Errorf("Entry with Target %s is both a Feed and a group", target)
case f.isFeed():
name := f.Feed.Name
if name == "" {
return fmt.Errorf("Unnamed feed")
}
if _, ok := feeds[name]; ok {
return fmt.Errorf("Duplicate Feed Name '%s'", name)
}
feeds[name] = &F.Feed{
Name: f.Feed.Name,
Target: target,
Url: f.Feed.Url,
Options: f.Feed.Options,
}
case f.isGroup():
if err := buildFeeds(f.Group.Feeds, target, feeds); err != nil {
return err
}
}
}
return nil
}
func Load(path string) (C.Config, F.Feeds, error) {
buf, err := ioutil.ReadFile(path)
if err != nil {
return C.Config{}, nil, fmt.Errorf("while reading '%s': %w", path, err)
}
var parsedCfg config
if parsedCfg, err = parse(buf); err != nil {
return C.Config{}, nil, err
}
feeds := F.Feeds{}
if err := buildFeeds(parsedCfg.Feeds, []string{}, feeds); err != nil {
return C.Config{}, nil, fmt.Errorf("while parsing: %w", err)
}
return C.Config{GlobalConfig: parsedCfg.GlobalConfig}, feeds, nil
}
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