render

type Options struct {
	Palette Palette
	// Width truncates each line to that many display cells. Zero leaves lines whole.
	Width int
	// Syntax highlights the code inside each line. It costs a lexer pass per line, so a caller
	// drawing a large diff into a small pane can leave it off.
	Syntax bool
	// WordDiff marks what changed inside a modified line, pairing each deletion with the addition
	// that replaced it.
	WordDiff bool
	// LineNumbers puts the old and new line numbers in a gutter.
	LineNumbers bool
	// SideBySide draws the old and the new content in two columns, pairing each run of deletions
	// with the additions that replaced it. It needs Width, since the columns are cut from it.
	SideBySide bool
}

type Palette struct {
	// File heads the block for one path.
	File color.Color
	// Hunk is the @@ line naming the range.
	Hunk color.Color
	// Added, Removed, and Context are the line faces, applied to the whole line.
	Added   color.Color
	Removed color.Color
	Context color.Color
	// AddedWord and RemovedWord are the backgrounds marking what changed inside a line, drawn only
	// when Options.WordDiff is set.
	AddedWord   color.Color
	RemovedWord color.Color
	// Gutter is the line-number column, drawn only when Options.LineNumbers is set.
	Gutter color.Color
	// Syntax is the token faces. A zero Syntax renders code unhighlighted.
	Syntax SyntaxPalette
}

type SyntaxPalette struct {
	Comment  color.Color
	Keyword  color.Color
	String   color.Color
	Number   color.Color
	Name     color.Color
	Type     color.Color
	Operator color.Color
}