Extract the logic of the reader into its own class

pkg/tagesschau/convert.go

@@ -0,0 +1,57 @@
+package tagesschau
+
+import "strings"
+
+func ContentToParagraphs(content []Content) []string {
+	prevType := "text"
+	prevSection := false
+	paragraph := ""
+	var paragraphs []string
+	for _, c := range content {
+		switch c.Type {
+		case "text":
+			fallthrough
+		case "headline":
+			text := c.Value
+			if strings.Trim(text, " ") == "" {
+				continue
+			}
+
+			// drop author information
+			if isHighlighted(text, "em") {
+				continue
+			}
+
+			// remove hyperlinks from text
+			for {
+				startIdx := strings.Index(text, "<a ")
+				if startIdx == -1 {
+					break
+				}
+				endIndex := strings.Index(text, "\">")
+				if endIndex == -1 {
+					break
+				}
+				text = text[:startIdx+2] + text[endIndex+1:]
+			}
+			sec := isSection(text)
+			if (prevType != c.Type || sec || prevSection) && paragraph != "" {
+				paragraphs = append(paragraphs, paragraph)
+				paragraph = ""
+			}
+			paragraph += text + " "
+			prevSection = sec
+		}
+		prevType = c.Type
+	}
+	paragraphs = append(paragraphs, paragraph)
+	return paragraphs
+}
+
+func isSection(text string) bool {
+	return isHighlighted(text, "strong") || isHighlighted(text, "em")
+}
+
+func isHighlighted(text string, tag string) bool {
+	return strings.HasPrefix(text, "<"+tag+">") && strings.HasSuffix(text, "</"+tag+">")
+}

pkg/tui/reader.go

@@ -0,0 +1,104 @@
+package tui
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/charmbracelet/bubbles/viewport"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+	"github.com/zMoooooritz/nachrichten/pkg/config"
+	"github.com/zMoooooritz/nachrichten/pkg/util"
+)
+
+type Reader struct {
+	style       config.Style
+	isFocused   bool
+	toplineText string
+	dateText    string
+	viewport    viewport.Model
+}
+
+func NewReader(s config.Style) Reader {
+	return Reader{
+		style:    s,
+		viewport: viewport.New(0, 0),
+	}
+}
+
+func (r *Reader) GotoTop() {
+	r.viewport.GotoTop()
+}
+
+func (r *Reader) GotoBottom() {
+	r.viewport.GotoBottom()
+}
+
+func (r *Reader) SetFocused(isFocused bool) {
+	r.isFocused = isFocused
+}
+
+func (r *Reader) IsFocused() bool {
+	return r.isFocused
+}
+
+func (r *Reader) SetDims(w, h int) {
+	r.viewport.Width = w
+	r.viewport.Height = h - lipgloss.Height(r.headerView()) - lipgloss.Height(r.footerView())
+	r.viewport.YPosition = lipgloss.Height(r.headerView())
+}
+
+func (r *Reader) SetContent(paragraphs []string) {
+	repr := util.FormatParagraphs(paragraphs, r.viewport.Width, r.style)
+	r.viewport.SetContent(repr)
+}
+
+func (r *Reader) SetHeaderContent(topline string, date string) {
+	r.toplineText = topline
+	r.dateText = date
+}
+
+func (r Reader) Init() tea.Cmd {
+	return nil
+}
+
+func (r Reader) Update(msg tea.Msg) (Reader, tea.Cmd) {
+	var cmd tea.Cmd
+	r.viewport, cmd = r.viewport.Update(msg)
+	return r, tea.Batch(cmd)
+}
+
+func (r Reader) View() string {
+	return fmt.Sprintf("%s\n%s\n%s", r.headerView(), r.viewport.View(), r.footerView())
+}
+
+func (r Reader) headerView() string {
+	titleStyle := r.style.ReaderTitleInactiveStyle
+	lineStyle := r.style.InactiveStyle
+	dateStyle := r.style.ReaderInfoInactiveStyle
+	if r.isFocused {
+		titleStyle = r.style.ReaderTitleActiveStyle
+		lineStyle = r.style.ActiveStyle
+		dateStyle = r.style.ReaderInfoActiveStyle
+	}
+
+	title := titleStyle.Render(r.toplineText)
+	date := dateStyle.Render(r.dateText)
+	line := lineStyle.Render(strings.Repeat("─", util.Max(0, r.viewport.Width-lipgloss.Width(title)-lipgloss.Width(date))))
+
+	return lipgloss.JoinHorizontal(lipgloss.Center, title, line, date)
+}
+
+func (r Reader) footerView() string {
+	infoStyle := r.style.ReaderInfoInactiveStyle
+	lineStyle := r.style.InactiveStyle
+	if r.isFocused {
+		infoStyle = r.style.ReaderInfoActiveStyle
+		lineStyle = r.style.ActiveStyle
+	}
+
+	info := infoStyle.Render(fmt.Sprintf("%3.f%%", r.viewport.ScrollPercent()*100))
+	line := lineStyle.Render(strings.Repeat("─", util.Max(0, r.viewport.Width-lipgloss.Width(info))))
+
+	return lipgloss.JoinHorizontal(lipgloss.Center, line, info)
+}