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package app
import (
"strings"
"github.com/Fuwn/faustus/internal/claude"
)
func (m *Model) invalidatePreviewCache() {
m.previewCache = nil
m.previewFor = ""
m.previewScroll = 0
}
func (m *Model) preview() *claude.PreviewContent {
if len(m.filtered) == 0 {
return nil
}
session := &m.filtered[m.cursor]
if m.previewCache != nil && m.previewFor == session.SessionID {
return m.previewCache
}
previewContent := claude.LoadSessionPreview(session, 50)
m.previewCache = &previewContent
m.previewFor = session.SessionID
return m.previewCache
}
type previewMetrics struct {
totalLines int
messageLines []int
}
func (m *Model) calculatePreviewMetrics() previewMetrics {
preview := m.preview()
if preview == nil || preview.Error != "" {
return previewMetrics{}
}
width := m.previewWidth() - 8
if width <= 0 {
width = 40
}
var metrics previewMetrics
lineCount := 0
if m.cursor < len(m.filtered) {
lineCount += 1
lineCount += 1
lineCount += 1
lineCount += 1
}
for _, previewMessage := range preview.Messages {
metrics.messageLines = append(metrics.messageLines, lineCount)
lineCount += 1
wrapped := wrapText(previewMessage.Content, width)
contentLines := strings.Count(wrapped, "\n") + 1
lineCount += contentLines
lineCount += 1
}
metrics.totalLines = lineCount
return metrics
}
func (m *Model) clampPreviewScroll() {
height := m.listHeight() - 2
metrics := m.calculatePreviewMetrics()
maxScroll := max(0, metrics.totalLines-height+1)
if m.previewScroll < 0 {
m.previewScroll = 0
}
if m.previewScroll > maxScroll {
m.previewScroll = maxScroll
}
}
func (m *Model) scrollToPreviewMatch() {
if len(m.previewSearchMatches) == 0 {
return
}
matchMessageIndex := m.previewSearchMatches[m.previewSearchIndex]
metrics := m.calculatePreviewMetrics()
if matchMessageIndex >= len(metrics.messageLines) {
return
}
lineNumber := metrics.messageLines[matchMessageIndex]
height := m.listHeight() - 2
m.previewScroll = max(0, lineNumber-height/3)
m.clampPreviewScroll()
}
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