Method Render

cmd/grv/diff_view.go:236–303

Render generates and writes the diff view to the provided window

(win RenderWindow)

// Render generates and writes the diff view to the provided window
func (diffView *DiffView) Render(win RenderWindow) (err error) {
	diffView.lock.Lock()
	defer diffView.lock.Unlock()

	diffView.lastViewDimension = win.ViewDimensions()

	if diffView.activeDiff == "" {
		return diffView.AbstractWindowView.renderEmptyView(win, "No diff to display")
	} else if diffView.activeDiff != diffView.lastRequestedDiff {
		return diffView.AbstractWindowView.renderEmptyView(win, "Loading diff...")
	}

	rows := win.Rows() - 2
	viewPos := diffView.activeViewPos
	diffLines, ok := diffView.diffs[diffView.activeDiff]
	if !ok {
		log.Errorf("No diff data found for %v", diffView.activeDiff)
		return
	}

	lineNum := uint(len(diffLines.lines))
	viewPos.DetermineViewStartRow(rows, lineNum)

	lineIndex := viewPos.ViewStartRowIndex()
	startColumn := viewPos.ViewStartColumn()

	var lineBuilder *LineBuilder
	for rowIndex := uint(0); rowIndex < rows && lineIndex < lineNum; rowIndex++ {
		diffLine := diffLines.lines[lineIndex]

		if lineBuilder, err = win.LineBuilder(rowIndex+1, startColumn); err != nil {
			return
		}

		lineBuilder.Append(" ")
		for _, section := range diffLine.sections {
			if section.char != 0 {
				lineBuilder.AppendACSChar(section.char, section.themeComponentID)
			} else {
				lineBuilder.AppendWithStyle(section.themeComponentID, section.text)
			}
		}

		lineIndex++
	}

	if err = win.SetSelectedRow(viewPos.SelectedRowIndex()+1, diffView.viewState); err != nil {
		return
	}

	win.DrawBorder()

	if err = win.SetTitle(CmpDiffviewTitle, "Diff for %v", diffView.activeDiff); err != nil {
		return
	}

	if err = win.SetFooter(CmpDiffviewFooter, "Line %v of %v", viewPos.ActiveRowIndex()+1, lineNum); err != nil {
		return