wip: flickering or no text showing

pager/pager.go

@@ -0,0 +1,82 @@
+package pager
+
+import (
+	"github.com/charmbracelet/bubbles/viewport"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/glamour"
+	"github.com/pkg/errors"
+)
+
+/* TODO:
+- add rendered markdown
+- show status (similar to paginator?)
+- add search functionality - similar to neovim
+*/
+
+const useHighPerformanceRenderer = false
+
+type Model struct {
+    content string
+    ready bool 
+    viewport viewport.Model
+    errors []error
+}
+
+func New(content string) Model {
+    return Model{content: content}
+}
+
+func (m Model) Init() tea.Cmd {
+    return nil
+}
+
+func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+    var (
+        cmd tea.Cmd
+        cmds []tea.Cmd
+    )
+    switch msg := msg.(type) {
+    case tea.WindowSizeMsg:
+        if !m.ready {
+            m.viewport = viewport.New(msg.Width, msg.Height)
+            m.viewport.HighPerformanceRendering = useHighPerformanceRenderer
+            renderedContent, err := m.renderContent(msg.Width)
+            if err != nil {
+                m.errors = append(m.errors, err)
+            }
+            m.viewport.SetContent(renderedContent)
+            m.ready = true
+        } else {
+            m.viewport.Width = msg.Width
+            m.viewport.Height = msg.Height
+        }
+        
+        if useHighPerformanceRenderer {
+            cmds = append(cmds, viewport.Sync(m.viewport))
+        }
+    }
+    m.viewport, cmd = m.viewport.Update(msg)
+    cmds = append(cmds, cmd)
+    return m, tea.Batch(cmds...)
+    // TODO: scrolling
+    // TODO: filtering
+}
+
+func (m Model) renderContent(width int) (string, error) {
+    r, err := glamour.NewTermRenderer(
+		glamour.WithAutoStyle(),
+		glamour.WithWordWrap(width),
+	)
+	if err != nil {
+        return "", errors.Wrap(err, "could not init glamour renderer")
+	}
+    rendered, err := r.Render(m.content)
+	if err != nil {
+        return "", errors.Wrap(err, "could not render content")
+	}
+    return rendered, nil
+}
+
+func (m Model) View() string {
+    return m.viewport.View()
+}