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opml.go
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opml.go
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package opml
import (
"fmt"
"html"
"strings"
)
type Folder struct {
Title string
Folders []Folder
Feeds []Feed
}
type Feed struct {
Title string
FeedUrl string
SiteUrl string
}
func (f Folder) AllFeeds() []Feed {
feeds := make([]Feed, 0)
feeds = append(feeds, f.Feeds...)
for _, subfolder := range f.Folders {
feeds = append(feeds, subfolder.AllFeeds()...)
}
return feeds
}
var e = html.EscapeString
var indent = " "
var nl = "\n"
func (f Folder) outline(level int) string {
builder := strings.Builder{}
prefix := strings.Repeat(indent, level)
if level > 0 {
builder.WriteString(prefix + fmt.Sprintf(`<outline text="%s">`+nl, e(f.Title)))
}
for _, folder := range f.Folders {
builder.WriteString(folder.outline(level + 1))
}
for _, feed := range f.Feeds {
builder.WriteString(feed.outline(level + 1))
}
if level > 0 {
builder.WriteString(prefix + `</outline>` + nl)
}
return builder.String()
}
func (f Feed) outline(level int) string {
return strings.Repeat(indent, level) + fmt.Sprintf(
`<outline type="rss" text="%s" xmlUrl="%s" htmlUrl="%s"/>`+nl,
e(f.Title), e(f.FeedUrl), e(f.SiteUrl),
)
}
func (f Folder) OPML() string {
builder := strings.Builder{}
builder.WriteString(`<?xml version="1.0" encoding="UTF-8"?>` + nl)
builder.WriteString(`<opml version="1.1">` + nl)
builder.WriteString(`<head><title>subscriptions</title></head>` + nl)
builder.WriteString(`<body>` + nl)
builder.WriteString(f.outline(0))
builder.WriteString(`</body>` + nl)
builder.WriteString(`</opml>` + nl)
return builder.String()
}