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* Scope - A simple and minimal metasearch engine
* Copyright (C) 2021 Arsen Musayelyan
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <>.
package cards
import (
const plotExtraHead = `
<script src="/static/ext/function-plot.js"></script>
.top-right-legend {
display: none;
const plotScript = `
<div id="plot-content" class="container"></div>
// Create function to draw plot in #plot-content
plotFn = () => functionPlot({
target: '#plot-content',
grid: true,
width: document.getElementById('plot-content').offsetWidth,
data: [{
fn: '%s'
// Create resize observer that runs plot function
new ResizeObserver(plotFn).observe(document.getElementById('plot-content'))
func init() {
// Register plot card
Register("plot", 2, NewPlotCard)
// PlotCard represents a card with an equation plot
type PlotCard struct {
query string
// NewPlotCard is a NewCardFunc that creates a new PlotCard
func NewPlotCard(query, _ string) Card {
return &PlotCard{query: query}
// Matches checks if the query matches the rules for PlotCard
func (pc *PlotCard) Matches() bool {
return strings.HasPrefix(pc.query, "plot") ||
strings.HasPrefix(pc.query, "graph") ||
strings.HasPrefix(pc.query, "draw")
// StripKey removes all keys related to PlotCard
func (pc *PlotCard) StripKey() string {
query := strings.TrimPrefix(pc.query, "plot")
query = strings.TrimPrefix(query, "graph")
query = strings.TrimPrefix(query, "draw")
return strings.TrimSpace(query)
// Content returns plot script with given input
func (pc *PlotCard) Content() template.HTML {
return template.HTML(fmt.Sprintf(
// Returned will alwats return true because
// this card is frontend, and this cannot be checked.
func (pc *PlotCard) Returned() bool {
return true
// Title generates a title formatted as "Plot (<eqation>)"
func (pc *PlotCard) Title() string {
return "Plot (" + pc.StripKey() + ")"
// Head returns extra head tags for PlotCard
func (pc *PlotCard) Head() template.HTML {
return plotExtraHead
// Footer returns an empty string as PlotCard has no footer
func (pc *PlotCard) Footer() template.HTML {
return ""
// RunQuery returns nil as PlotCard is a frontend card
func (pc *PlotCard) RunQuery() error {
return nil