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LICENSE

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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+
+                            Preamble
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+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    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 <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

Makefile

@@ -0,0 +1,23 @@
+all: build static
+.PHONY: all
+
+build:
+	go build
+.PHONY: build
+
+static:
+	mkdir -p static
+
+	wget https://cdn.jsdelivr.net/npm/bulma@0.9.3/css/bulma.min.css -O static/bulma.min.css
+
+	wget https://code.iconify.design/2/2.1.0/iconify.min.js -O static/iconify.min.js
+	
+	wget https://cdn.jsdelivr.net/npm/katex@0.15.1/dist/katex.min.css -O static/katex.min.css
+	wget https://cdn.jsdelivr.net/npm/katex@0.15.1/dist/katex.min.js -O static/katex.min.js
+
+	wget https://cdn.jsdelivr.net/npm/nerdamer@latest/nerdamer.core.js -O static/nerdamer.core.js
+	wget https://cdn.jsdelivr.net/npm/nerdamer@latest/Algebra.js -O static/Algebra.js
+	wget https://cdn.jsdelivr.net/npm/nerdamer@latest/Calculus.js -O static/Calculus.js
+	wget https://cdn.jsdelivr.net/npm/nerdamer@latest/Solve.js -O static/Solve.js
+
+	wget https://unpkg.com/function-plot/dist/function-plot.js -O static/function-plot.js

README.md

@@ -0,0 +1,94 @@
+# Scope
+A simple and minimal metasearch engine
+
+---
+
+## Why?
+
+I created Scope because I felt an easy, simple metasearch engine did not exist. I was using searx, but it requires many external programs and resources, and it can often be very complex to set up, especially if not used on x86_64.
+
+---
+
+## Features
+
+Scope has the following features:
+
+- Per-request user agent randomization
+- Result cards
+    - DuckDuckGo Instant Answers
+    - Equation solver
+    - Equation graphing
+    - Location weather
+- Global config
+
+---
+
+## Result Cards
+
+When searching for certain queries, a card can appear in the results. This card will contain the answer to the query. These cards work by detecting key words in the query.
+
+### Calculation
+
+The calculation card is a frontend card that solves a given equation or expression. The following queries can be used for calculations:
+
+- Expressions
+    - `calculate <expression>`
+- Equations
+    - `solve <equation>`
+    - `solve <equation> for <variable>`
+- Integrals
+    - `integrate <expression>`
+    - `integral <expression>`
+    - `integral of <expression>`
+- Derivatives
+    - `diff <expression>`
+    - `derive <expression>`
+    - `differentiate <expression>`
+    - `derivative <expression>`
+    - `derivative of <expression>`
+
+### Plot
+
+The plot card is a frontend card that graphs a given function. The following keywords can be used for this:
+
+- `plot <equation>`
+- `graph <equation>`
+- `draw <equation> `
+
+### Weather
+
+The weather card is a backend card that gets results from metaweather. The following keywords can be used:
+
+- `weather <location>`
+- `weather in <location>`
+- `<location> weather`
+
+### DuckDuckGo
+
+This card is a backend card that gets results from the DuckDuckGo Instant Answer API. It gets tried if no other card matches.
+
+---
+
+## Config
+
+The config for Scope applies to all users of the instance. There is no settings UI, as that would massively increase complexity, and the point of Scope is to be simple and minimal.
+
+The config allows you to configure a lot most of Scope.
+
+---
+
+## Static Resources
+
+Scope's static resources are embedded in the binary. Therefore, all that's needed to run scope is the binary and the config. This does not use Cgo, so cross compiling is as easy as setting the `GOARCH` and `GOOS` libraries. While only tested on Linux, it should work on other OSes as well.
+
+---
+
+## Mentions
+
+This project uses many other projects. Those projects and the reasons for using them will be listed here:
+
+- [Bulma](https://bulma.io): CSS framework
+- [Nerdamer](https://nerdamer.com/): Equation solver
+- [Function Plot](https://mauriciopoppe.github.io/function-plot/): Equation grapher
+- [Metaweather](https://www.metaweather.com/): Weather API
+- [DuckDuckGo](https://duckduckgo.com/): Provides instant answers

go.mod

@@ -0,0 +1,42 @@
+module go.arsenm.dev/scope
+
+go 1.17
+
+require (
+	github.com/DataHenHQ/useragent v0.1.0
+	github.com/Masterminds/sprig v2.22.0+incompatible
+	github.com/PuerkitoBio/goquery v1.8.0
+	github.com/bcicen/go-units v1.0.2
+	github.com/rs/zerolog v1.26.0
+	github.com/spf13/viper v1.9.0
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+)
+
+require (
+	github.com/Knetic/govaluate v3.0.0+incompatible // indirect
+	github.com/Masterminds/goutils v1.1.1 // indirect
+	github.com/Masterminds/semver v1.5.0 // indirect
+	github.com/andybalholm/cascadia v1.3.1 // indirect
+	github.com/bcicen/bfstree v0.0.0-20180121191807-11ea469698a6 // indirect
+	github.com/fsnotify/fsnotify v1.5.1 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/huandu/xstrings v1.3.2 // indirect
+	github.com/imdario/mergo v0.3.12 // indirect
+	github.com/magiconair/properties v1.8.5 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/mapstructure v1.4.2 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/pelletier/go-toml v1.9.4 // indirect
+	github.com/spf13/afero v1.6.0 // indirect
+	github.com/spf13/cast v1.4.1 // indirect
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.2.0 // indirect
+	golang.org/x/crypto v0.0.0-20211117183948-ae814b36b871 // indirect
+	golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2 // indirect
+	golang.org/x/sys v0.0.0-20210823070655-63515b42dcdf // indirect
+	golang.org/x/text v0.3.6 // indirect
+	gopkg.in/ini.v1 v1.63.2 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)

go.sum

@@ -0,0 +1,794 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
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+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
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internal/cards/calc.go

@@ -0,0 +1,156 @@
+package cards
+
+import (
+	"fmt"
+	"html/template"
+	"regexp"
+	"strings"
+)
+
+const calcExtraHead = `
+<link rel="stylesheet" href="/static/katex.min.css">
+<script defer src="/static/katex.min.js"></script>
+
+<script src="/static/nerdamer.core.js"></script>
+<script src="/static/Algebra.js"></script>
+<script src="/static/Calculus.js"></script>
+<script src="/static/Solve.js"></script>`
+
+const solveRenderScript = `
+<div id="calc-content" class="subtitle mx-2 my-0"></div>
+<script>
+window.onload = () => {
+	latex = nerdamer.convertToLaTeX(nerdamer('%s').toString())
+	katex.render(latex, document.getElementById('calc-content'))
+}
+</script>`
+
+func init() {
+	// Register calc card
+	Register("calc", 0, NewCalcCard)
+}
+
+// CalcCard represents a calculation card
+type CalcCard struct {
+	query      string
+	useFunc    bool
+	function   string
+	args       []string
+	expression string
+}
+
+// NewCalcCard is a NewCardFunc that creates a new CalcCard
+func NewCalcCard(query, _ string) Card {
+	return &CalcCard{query: query, useFunc: true}
+}
+
+func (cc *CalcCard) Matches() bool {
+	// If query has solve prefix
+	if strings.HasPrefix(cc.query, "solve") {
+		// Set function to solve
+		cc.function = "solve"
+
+		// Compile regex for specifying veriable to solve for
+		forRgx := regexp.MustCompile(`solve (.+) for (.+)`)
+		// If query matches regex
+		if forRgx.MatchString(cc.query) {
+			// Find furst regex match
+			matches := forRgx.FindStringSubmatch(cc.query)
+			// Append function aeguments. First is equation, second variable
+			cc.args = append(cc.args, matches[1], matches[2])
+		} else {
+			// Append function arguments assuming variable is x
+			cc.args = append(cc.args, cc.StripKey(), "x")
+		}
+
+		return true
+	}
+
+	// If query has integrate prefix
+	if strings.HasPrefix(cc.query, "integrate") ||
+		strings.HasPrefix(cc.query, "integral of") ||
+		strings.HasPrefix(cc.query, "integral") {
+
+		// Set function to integrate
+		cc.function = "integrate"
+		// Append function arguments
+		cc.args = append(cc.args, cc.StripKey())
+
+		return true
+	}
+
+	// If query has derivative prefix
+	if strings.HasPrefix(cc.query, "diff") ||
+		strings.HasPrefix(cc.query, "derive") ||
+		strings.HasPrefix(cc.query, "differentiate") ||
+		strings.HasPrefix(cc.query, "derivative of") ||
+		strings.HasPrefix(cc.query, "derivative") {
+
+		// Set function to diff
+		cc.function = "diff"
+		// Append function arguments
+		cc.args = append(cc.args, cc.StripKey())
+
+		return true
+	}
+
+	// If query has calculate prefix
+	if strings.HasPrefix(cc.query, "calculate") {
+		// This is an expression, so no function needed
+		cc.useFunc = false
+		// Set expression to query stripped of keys
+		cc.expression = cc.StripKey()
+		return true
+	}
+
+	return false
+}
+
+func (cc *CalcCard) StripKey() string {
+	// Compile regex for words to be removed
+	trimRgx := regexp.MustCompile(`^(.*?)solve|integrate|integral(?: of)?|diff|differentiate|derivative(?: of)?|derive|calculate(.*)$`)
+	// Return string with words removed
+	return trimRgx.ReplaceAllString(cc.query, "${1}${2}")
+}
+
+func (cc *CalcCard) Content() template.HTML {
+	var input string
+	// If function is being used
+	if cc.useFunc {
+		// Set input to formatted function
+		input = formatFunc(cc.function, cc.args)
+	} else {
+		// Set input to expression
+		input = cc.expression
+	}
+	// Return script with given input
+	return template.HTML(fmt.Sprintf(
+		solveRenderScript,
+		input,
+	))
+}
+
+func (cc *CalcCard) Footer() template.HTML {
+	return ""
+}
+
+func (cc *CalcCard) Returned() bool {
+	return true
+}
+
+func (cc *CalcCard) RunQuery() error {
+	return nil
+}
+
+func (cc *CalcCard) Title() string {
+	return "Calculation"
+}
+
+func (cc *CalcCard) Head() template.HTML {
+	return calcExtraHead
+}
+
+func formatFunc(function string, args []string) string {
+	// Format as function(arg1,arg2...)
+	return function + "(" + strings.Join(args, ",") + ")"
+}

internal/cards/cards.go

@@ -0,0 +1,88 @@
+package cards
+
+import (
+	"errors"
+	"html/template"
+	"sort"
+)
+
+var ErrCardRegistered = errors.New("card with that name has already been registered")
+
+// cardRegistration represents a card that has been registered
+type cardRegistration struct {
+	name     string
+	priority int
+	newFn    NewCardFunc
+}
+
+// cards stores all registered cards
+var cards = []cardRegistration{}
+
+// NewCardFunc creates and returns a new card.
+// This should not be an expensive operation
+type NewCardFunc func(query, userAgent string) Card
+
+// Card represents a search result card
+type Card interface {
+	// RunQuery runs any HTTP or other requests
+	RunQuery() error
+
+	// Returned returns whether the query
+	// returned any information
+	Returned() bool
+
+	// Matches returns whether the query matches
+	// for the card
+	Matches() bool
+
+	// StripKey removes the key words and returns
+	// the updated query
+	StripKey() string
+
+	// Title returns the card title
+	Title() string
+
+	// Content returns the contents of the card
+	Content() template.HTML
+
+	// Footer returns the contents of the card footer
+	Footer() template.HTML
+
+	// Head returns any extras to include in <head>
+	Head() template.HTML
+}
+
+// Register adds a new card to the library
+func Register(name string, priority int, fn NewCardFunc) {
+	// For every registered card
+	for _, cardReg := range cards {
+		// If priority already exists, increase
+		if cardReg.priority == priority {
+			priority++
+		}
+		// If card already registered, return
+		if cardReg.name == name {
+			return
+		}
+	}
+	// Add card to slice
+	cards = append(cards, cardRegistration{name, priority, fn})
+}
+
+// GetCard returns a matching registered card
+func GetCard(query, userAgent string) Card {
+	// Sort slice by priority
+	sort.Slice(cards, func(i, j int) bool {
+		return cards[i].priority < cards[j].priority
+	})
+	// For every registered card
+	for _, cardReg := range cards {
+		// Create new card
+		card := cardReg.newFn(query, userAgent)
+		// If card matches, return it 
+		if card.Matches() {
+			return card
+		}
+	}
+	return nil
+}

internal/cards/ddg.go

@@ -0,0 +1,115 @@
+package cards
+
+import (
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"net/http"
+	"net/url"
+	"time"
+)
+
+func init() {
+	Register("ddg", 3, NewDDGCard)
+}
+
+// ddgAttribution is HTML for attribution of DuckDuckGo at their request
+const ddgAttribution = `<p class="is-size-7 pt-2">
+	<span class="iconify" data-icon="simple-icons:duckduckgo" data-inline="true"></span>&nbsp;
+    Results from
+    <a href="https://duckduckgo.com/%s">DuckDuckGo &raquo;</a>
+</p>`
+
+// DDGCard represents a DuckDuckGo Instant Answer API card
+type DDGCard struct {
+	query     string
+	userAgent string
+	resp      DDGInstAns
+}
+
+// DDGInstAns represents a DuckDuckGo Instant Answer API response
+type DDGInstAns struct {
+	Abstract       string
+	AbstractText   string
+	AbstractSource string
+	AbstractURL    string
+	Image          string
+	Heading        string
+	Answer         string
+	AnswerType     string
+}
+
+// NewDDGCard isa NewCardFunc that creates a new DDGCard
+func NewDDGCard(query, userAgent string) Card {
+	return &DDGCard{
+		query:     url.QueryEscape(query),
+		userAgent: userAgent,
+	}
+}
+
+// RunQuery requests the query from the instant answer API
+func (ddg *DDGCard) RunQuery() error {
+	http.DefaultClient.Timeout = 5 * time.Second
+
+	// Create new API request
+	req, err := http.NewRequest(
+		http.MethodGet,
+		"https://api.duckduckgo.com/?q="+ddg.query+"&format=json",
+		nil,
+	)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("User-Agent", ddg.userAgent)
+
+	// Perform request
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+
+	// Decode response into repsonse struct
+	err = json.NewDecoder(res.Body).Decode(&ddg.resp)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (ddg *DDGCard) Returned() bool {
+	// Value was returned if abstract is not empty
+	return ddg.resp.Abstract != ""
+}
+
+func (ddg *DDGCard) Matches() bool {
+	// Everything matches since there are no keys
+	return true
+}
+
+func (ddg *DDGCard) StripKey() string {
+	// No key to strip, so return query
+	return ddg.query
+}
+
+func (ddg *DDGCard) Title() string {
+	return ddg.resp.Heading
+}
+
+func (ddg *DDGCard) Content() template.HTML {
+	// Return abstract with attribution
+	return template.HTML(ddg.resp.Abstract + fmt.Sprintf(ddgAttribution, ddg.query))
+}
+
+func (ddg *DDGCard) Footer() template.HTML {
+	// Return footer with abstract url and source
+	return template.HTML(fmt.Sprintf(
+		`<div class="card-footer"><a class="card-footer-item" href="%s">%s</a></div>`,
+		ddg.resp.AbstractURL,
+		ddg.resp.AbstractSource,
+	))
+}
+
+func (ddg *DDGCard) Head() template.HTML {
+	return ""
+}

internal/cards/metaweather.go

@@ -0,0 +1,247 @@
+package cards
+
+import (
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/bcicen/go-units"
+	"github.com/spf13/viper"
+)
+
+func init() {
+	Register("metaweather", 1, NewMetaweatherCard)
+}
+
+const metaweatherContent = `
+<div class="columns">
+	<div class="column">
+		<span class="iconify" data-width="75" data-height="75" data-icon="%s"></span><p class="subtitle">%s</p>
+	</div>
+	<div class="column has-text-right">
+		<p class="title has-text-weight-normal">%s</p>
+	</div>
+</div>
+<div class="columns">
+	<div class="column has-text-centered">
+		<p><b>Min Temp:</b> %s</p>
+		<p><b>Max Temp:</b> %s</p>
+		<p><b>Wind Speed:</b> %s</p>
+	</div>
+	<div class="column has-text-centered">
+		<p><b>Humidity:</b> %d%%</p>
+		<p><b>Visibility:</b> %s</p>
+		<p><b>Predictability:</b> %d%%</p>
+	</div>
+	<div class="column has-text-centered">
+		<p><b>Wind Direction:</b> %s</p>
+		<p><b>Location:</b> %s</p>
+		<p><b>Timezone:</b> %s</p>
+	</div>
+</div>`
+
+// weatherIconMap maps metaweather abbreviations
+// to iconify icons
+var weatherIconMap = map[string]string{
+	"sn": "bi:cloud-snow",
+	"sl": "bi:cloud-sleet",
+	"h":  "bi:cloud-hail",
+	"t":  "bi:cloud-lightning-rain",
+	"hr": "bi:cloud-rain-heavy",
+	"lr": "bi:cloud-drizzle",
+	"s":  "wi:day-rain",
+	"hc": "bi:cloud-fill",
+	"lc": "bi:cloud",
+	"c":  "akar-icons:sun",
+}
+
+// MetaweatherCard represents a metaweather card
+type MetaweatherCard struct {
+	query     string
+	userAgent string
+	location  []MetaweatherLocation
+	resp      MetaweatherResponse
+}
+
+// NewMetaweatherCard is a NewCardFunc that creates a new MetaweatherCard
+func NewMetaweatherCard(query, userAgent string) Card {
+	return &MetaweatherCard{
+		query:     query,
+		userAgent: userAgent,
+	}
+}
+
+// MetaweatherLocation represents a location
+type MetaweatherLocation struct {
+	Title string `json:"title"`
+	WOEID int    `json:"woeid"`
+}
+
+// MetaweatherResponse represents a response from
+// the metaweather API
+type MetaweatherResponse struct {
+	Detail       string `json:"detail"`
+	Title        string `json:"title"`
+	Timezone     string `json:"timezone"`
+	Consolidated []struct {
+		ID             int     `json:"id"`
+		State          string  `json:"weather_state_name"`
+		StateAbbr      string  `json:"weather_state_abbr"`
+		WindCompass    string  `json:"wind_direction_compass"`
+		MinTemp        float64 `json:"min_temp"`
+		MaxTemp        float64 `json:"max_temp"`
+		CurrentTemp    float64 `json:"the_temp"`
+		WindSpeed      float64 `json:"wind_speed"`
+		WindDirection  float64 `json:"wind_direction"`
+		AirPressure    float64 `json:"air_pressure"`
+		Visibility     float64 `json:"visibility"`
+		Humidity       int     `json:"humidity"`
+		Predictability int     `json:"predictability"`
+	} `json:"consolidated_weather"`
+}
+
+// RunQuery searches for the location and then runs an API query
+// using the returned WOEID
+func (mc *MetaweatherCard) RunQuery() error {
+	http.DefaultClient.Timeout = 5 * time.Second
+
+	// Create location search request
+	req, err := http.NewRequest(
+		http.MethodGet,
+		"https://www.metaweather.com/api/location/search/?query="+url.QueryEscape(mc.StripKey()),
+		nil,
+	)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("User-Agent", mc.userAgent)
+
+	// Perform request
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+
+	// Decode response into location
+	err = json.NewDecoder(res.Body).Decode(&mc.location)
+	if err != nil {
+		return err
+	}
+
+	res.Body.Close()
+
+	// If no locations, search returned no results
+	if len(mc.location) == 0 {
+		return nil
+	}
+
+	// Create request for weather data
+	req, err = http.NewRequest(
+		http.MethodGet,
+		"https://www.metaweather.com/api/location/"+strconv.Itoa(mc.location[0].WOEID),
+		nil,
+	)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("User-Agent", mc.userAgent)
+
+	// Perform request
+	res, err = http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+
+	// Decode response into response struct
+	err = json.NewDecoder(res.Body).Decode(&mc.resp)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (mc *MetaweatherCard) Returned() bool {
+	return len(mc.location) > 0 && mc.resp.Detail != "Not found."
+}
+
+func (mc *MetaweatherCard) Matches() bool {
+	return strings.HasPrefix(mc.query, "weather in") ||
+		strings.HasPrefix(mc.query, "weather") ||
+		strings.HasSuffix(mc.query, "weather")
+}
+
+func (mc *MetaweatherCard) StripKey() string {
+	query := strings.TrimPrefix(mc.query, "weather in")
+	query = strings.TrimPrefix(query, "weather")
+	query = strings.TrimSuffix(query, "weather")
+	return strings.TrimSpace(query)
+}
+
+func (mc *MetaweatherCard) Content() template.HTML {
+	return template.HTML(fmt.Sprintf(
+		metaweatherContent,
+		// Write iconift icon for weather state
+		weatherIconMap[mc.resp.Consolidated[0].StateAbbr],
+		// Write weather state
+		mc.resp.Consolidated[0].State,
+		// Convert and write current temperature
+		convert(mc.resp.Consolidated[0].CurrentTemp, "temperature", units.Celsius),
+		// Convert and write minimum temperature
+		convert(mc.resp.Consolidated[0].MinTemp, "temperature", units.Celsius),
+		// Convert and write maximum temperature
+		convert(mc.resp.Consolidated[0].MaxTemp, "temperature", units.Celsius),
+		// Write wind speed
+		fmt.Sprintf("%.2f mph", mc.resp.Consolidated[0].WindSpeed),
+		// Write humidity percentafe
+		mc.resp.Consolidated[0].Humidity,
+		// Convert and write visibility
+		convert(mc.resp.Consolidated[0].Visibility, "visibility", units.Mile),
+		// Write predictability percentage
+		mc.resp.Consolidated[0].Predictability,
+		// Write compass wind direction
+		mc.resp.Consolidated[0].WindCompass,
+		// Write title
+		mc.resp.Title,
+		// Write timezone
+		mc.resp.Timezone,
+	))
+}
+
+func (mc *MetaweatherCard) Title() string {
+	return "Weather"
+}
+
+func (mc *MetaweatherCard) Footer() template.HTML {
+	// Return footer with link to metaweather
+	return `<div class="card-footer"><a class="card-footer-item" href="https://www.metaweather.com/">Metaweather</a></div>`
+}
+
+func (mc *MetaweatherCard) Head() template.HTML {
+	return ""
+}
+
+// convert converts a value to a unit specified in the config, and then formats it
+func convert(val float64, suffix string, defaultUnit units.Unit) string {
+	// Find unit in config
+	unit, err := units.Find(viper.GetString("search.cards.weather.units." + suffix))
+	if err != nil {
+		unit = defaultUnit
+	}
+	// Convert value to specified unit
+	newVal, err := units.ConvertFloat(val, defaultUnit, unit)
+	opts := units.FmtOptions{
+		Label:     true,
+		Short:     true,
+		Precision: 2,
+	}
+	if err != nil {
+		return units.NewValue(val, defaultUnit).Fmt(opts)
+	}
+	return newVal.Fmt(opts)
+}

internal/cards/plot.go

@@ -0,0 +1,89 @@
+package cards
+
+import (
+	"fmt"
+	"html/template"
+	"strings"
+)
+
+const plotExtraHead = `
+<script src="/static/function-plot.js"></script>
+<style>
+.top-right-legend {
+	display: none;
+}
+</style>`
+
+const plotScript = `
+<div id="plot-content" class="container"></div>
+<script>
+plotFn = () => functionPlot({
+	target: '#plot-content',
+	grid: true,
+	width: document.getElementById('plot-content').offsetWidth,
+	data: [{
+		fn: '%s'
+	}]
+})
+new ResizeObserver(plotFn).observe(document.getElementById('plot-content'))
+</script>`
+
+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}
+}
+
+func (pc *PlotCard) Matches() bool {
+	return strings.HasPrefix(pc.query, "plot") ||
+		strings.HasPrefix(pc.query, "graph") ||
+		strings.HasPrefix(pc.query, "draw")
+}
+
+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)
+}
+
+func (pc *PlotCard) Content() template.HTML {
+	return template.HTML(fmt.Sprintf(
+		plotScript,
+		pc.StripKey(),
+	))
+}
+
+// Since this card is frontend, this cannot be checked.
+// Therefore, it will always return true.
+func (pc *PlotCard) Returned() bool {
+	return true
+}
+
+func (pc *PlotCard) Title() string {
+	return "Plot (" + pc.StripKey() + ")"
+}
+
+func (pc *PlotCard) Head() template.HTML {
+	return plotExtraHead
+}
+
+func (pc *PlotCard) Footer() template.HTML {
+	return ""
+}
+
+
+func (pc *PlotCard) RunQuery() error {
+	return nil
+}
+
+

main.go

@@ -0,0 +1,321 @@
+/*
+ *	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
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *	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 <https://www.gnu.org/licenses/>.
+ */
+
+package main
+
+import (
+	"embed"
+	"fmt"
+	"html/template"
+	"io/fs"
+	"net"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/DataHenHQ/useragent"
+	"github.com/Masterminds/sprig"
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+	"github.com/spf13/viper"
+	"go.arsenm.dev/scope/internal/cards"
+	"go.arsenm.dev/scope/search/web"
+)
+
+//go:embed templates
+var templates embed.FS
+
+//go:embed static
+var static embed.FS
+
+var engines = map[string]web.Engine{
+	"google": &web.Google{},
+	"ddg":    &web.DDG{},
+	"bing":   &web.Bing{},
+}
+
+var funcs = template.FuncMap{
+	"html": func(s string) template.HTML {
+		return template.HTML(s)
+	},
+}
+
+// TmplContext represents context passed to a template
+type TmplContext struct {
+	BaseContext
+	Results []*web.Result
+	Keyword string
+	Page    int
+	Card    cards.Card
+}
+
+type ErrTmplContext struct {
+	BaseContext
+	Error     string
+	ErrExists bool
+	Message   string
+	Status    int
+}
+
+type BaseContext struct {
+	LoadTime time.Duration
+}
+
+// Config returns a viper config value
+func (bc BaseContext) Config(key string) interface{} {
+	return viper.Get(key)
+}
+
+func init() {
+	// Set logger
+	log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
+
+	// Set config options
+	viper.AddConfigPath(".")
+	viper.AddConfigPath("$HOME/.config")
+	viper.AddConfigPath("/etc")
+	viper.SetConfigName("scope")
+	viper.SetConfigType("toml")
+
+	// Read configuration
+	viper.WatchConfig()
+	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+	viper.SetEnvPrefix("scope")
+	if err := viper.ReadInConfig(); err != nil {
+		log.Fatal().Err(err).Msg("Error reading config")
+	}
+	viper.AutomaticEnv()
+}
+
+func main() {
+	// Get embedded templates directory
+	tmplRoot, err := fs.Sub(templates, "templates")
+	if err != nil {
+		log.Fatal().Err(err).Msg("Error getting embedded templates directory")
+	}
+
+	// Create new template for results
+	resultTmpl, err := template.New("base.html").
+		Funcs(sprig.FuncMap()).
+		Funcs(funcs).
+		ParseFS(tmplRoot, "result.html", "base.html")
+	if err != nil {
+		log.Fatal().Err(err).Msg("Error parsing result template")
+	}
+
+	// Create new template for home page
+	homeTmpl, err := template.New("base.html").
+		Funcs(sprig.FuncMap()).
+		ParseFS(tmplRoot, "home.html", "base.html")
+	if err != nil {
+		log.Fatal().Err(err).Msg("Error parsing home template")
+	}
+
+	// Create new template for home page
+	errorTmpl, err := template.New("base.html").
+		Funcs(sprig.FuncMap()).
+		ParseFS(tmplRoot, "error.html", "base.html")
+	if err != nil {
+		log.Fatal().Err(err).Msg("Error parsing error template")
+	}
+
+	// Create new template for home page
+	opensearchTmpl, err := template.New("opensearch.xml").
+		ParseFS(tmplRoot, "opensearch.xml")
+	if err != nil {
+		log.Fatal().Err(err).Msg("Error parsing opensearch template")
+	}
+
+	// GET / (Home page)
+	http.HandleFunc("/", func(res http.ResponseWriter, req *http.Request) {
+		start := time.Now()
+		homeTmpl.Execute(res, TmplContext{
+			BaseContext: BaseContext{
+				LoadTime: time.Since(start),
+			},
+		})
+	})
+
+	// GET /search (Results page)
+	http.HandleFunc("/search", func(res http.ResponseWriter, req *http.Request) {
+		// Get request start time
+		start := time.Now()
+
+		// Get queryParams parameters
+		queryParams := req.URL.Query()
+		// Get parameter "q"
+		query := queryParams.Get("q")
+
+		// If no keyword
+		if query == "" {
+			// Redirect to homepage
+			http.Redirect(res, req, "/", http.StatusFound)
+			return
+		}
+
+		// Get parameter "page"
+		pageNumStr := queryParams.Get("page")
+		// Attempt to convert to integer, otherwise assume 0
+		pageNum, err := strconv.Atoi(pageNumStr)
+		if err != nil {
+			pageNum = 0
+		}
+
+		// Get random user agent
+		randUA, _ := useragent.Desktop()
+
+		var cardCh chan cards.Card
+		if viper.GetBool("search.cards.enabled") {
+			cardCh = make(chan cards.Card, 1)
+			// Create channel for instant answer
+			if pageNum == 0 {
+				go func() {
+					// Get matching card for query
+					card := cards.GetCard(query, randUA)
+
+					// Run query
+					err := card.RunQuery()
+					if err != nil || !card.Returned() {
+						cardCh <- nil
+					}
+
+					// Send card to channel
+					cardCh <- card
+				}()
+			} else {
+				cardCh <- nil
+			}
+		}
+
+		// Search web using all specified engines
+		results, err := web.Search(
+			web.Options{
+				Keyword:   query,
+				UserAgent: randUA,
+				Page:      pageNum,
+			},
+			getEngines(viper.GetStringSlice("search.engines"))...,
+		)
+		if err != nil {
+			httpErr(res, http.StatusInternalServerError, err, "Error performing search", start, errorTmpl)
+			return
+		}
+
+		// Create new template context
+		tmplCtx := TmplContext{
+			BaseContext: BaseContext{
+				LoadTime: time.Since(start),
+			},
+			Results: results,
+			Keyword: query,
+			Page:    pageNum,
+		}
+
+		// If cards are enabled in config
+		if viper.GetBool("search.cards.enabled") {
+			// Set card to response
+			tmplCtx.Card = <-cardCh
+		}
+
+		// Execute result template for search response
+		err = resultTmpl.Execute(res, tmplCtx)
+		if err != nil {
+			httpErr(res, http.StatusInternalServerError, err, "Error executing result template", start, errorTmpl)
+			return
+		}
+	})
+
+	// GET /static/{path} (Static file server, 12 day cache)
+	http.Handle("/static/", maxAgeHandler(time.Hour*24*12, http.FileServer(http.FS(static))))
+
+	// GET /opensearch (OpenSearch description file)
+	http.HandleFunc("/opensearch", func(res http.ResponseWriter, req *http.Request) {
+		opensearchTmpl.Execute(res, TmplContext{})
+	})
+
+	// Join address and port from config
+	addr := net.JoinHostPort(viper.GetString("server.addr"), viper.GetString("server.port"))
+	
+	// Log server starting with address
+	log.Info().Str("address", addr).Msg("Starting HTTP server")
+	// Start server
+	if err := http.ListenAndServe(addr, nil); err != nil {
+		log.Fatal().Err(err).Msg("Error while serving")
+	}
+}
+
+func httpErr(res http.ResponseWriter, statusCode int, err error, msg string, start time.Time, errTmpl *template.Template) {
+	if err != nil {
+		// Log error with message
+		log.Error().Err(err).Msg(msg)
+		// Write status code to connection
+		res.WriteHeader(statusCode)
+		// Execute error template with error
+		errTmpl.Execute(res, ErrTmplContext{
+			BaseContext: BaseContext{
+				LoadTime: time.Since(start),
+			},
+			Error:     err.Error(),
+			ErrExists: true,
+			Message:   msg,
+			Status:    statusCode,
+		})
+	} else {
+		// Log error without message
+		log.Error().Msg(msg)
+		// Write status code to connection
+		res.WriteHeader(statusCode)
+		// Execute error template without error
+		errTmpl.Execute(res, ErrTmplContext{
+			BaseContext: BaseContext{
+				LoadTime: time.Since(start),
+			},
+			ErrExists: false,
+			Message:   msg,
+			Status:    statusCode,
+		})
+	}
+}
+
+// Get search endine from names
+func getEngines(names []string) []web.Engine {
+	var out []web.Engine
+	// For every provided name
+	for _, name := range names {
+		// If engine with that name does not exist, skip
+		engine, ok := engines[name]
+		if !ok {
+			continue
+		}
+		// Add endine to output
+		out = append(out, engine)
+	}
+	return out
+}
+
+// maxAgeHandler adds a cache header to the response with the duration provided
+func maxAgeHandler(d time.Duration, h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Set Cache-Control header
+		w.Header().Add("Cache-Control", fmt.Sprintf("max-age=%d, public, must-revalidate, proxy-revalidate", int(d.Seconds())))
+		// Pass to next handler
+		h.ServeHTTP(w, r)
+	})
+}

scope.toml

@@ -0,0 +1,32 @@
+[server]
+    addr = "0.0.0.0"
+    port = 8080
+
+[site]
+    name = "Scope"
+    baseURL = "http://localhost:8080"
+    sourceURL = "https://example.com"
+
+[search]
+    engines = ["google", "ddg", "bing"]
+
+[search.cards]
+    enabled = true
+    
+    [search.cards.weather.units]
+        temperature = "F"
+        visibility = "mi"
+        pressure = "hPa"
+
+[page.results]
+    showLink = true
+    engineTags = true
+    cachedLink = true
+    descCharLimit = 400
+
+[page.results.searchbar]
+    homeBtn = true
+    resetBtn = true
+
+[page.results.footer]
+    enabled = true

search/web/bing.go

@@ -0,0 +1,97 @@
+package web
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/PuerkitoBio/goquery"
+)
+
+var bingURL = urlMustParse("https://www.bing.com/search?count=10")
+
+type Bing struct {
+	keyword   string
+	userAgent string
+	first     int
+	doc       *goquery.Document
+	initDone  bool
+	baseSel   *goquery.Selection
+}
+
+func (b *Bing) SetKeyword(keyword string) {
+	b.keyword = keyword
+}
+
+func (b *Bing) SetPage(page int) {
+	b.first = page * 10
+}
+
+func (b *Bing) SetUserAgent(ua string) {
+	b.userAgent = ua
+}
+
+func (b *Bing) Init() error {
+	initURL := copyURL(bingURL)
+	query := initURL.Query()
+	query.Set("q", b.keyword)
+	if b.first > 0 {
+		query.Set("first", strconv.Itoa(b.first))
+	} else {
+		query.Set("first", "1")
+	}
+	initURL.RawQuery = query.Encode()
+
+	req, err := http.NewRequest(
+		http.MethodGet,
+		initURL.String(),
+		nil,
+	)
+	if err != nil {
+		return err
+	}
+	if b.userAgent == "" {
+		b.userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36"
+	}
+	req.Header.Set("User-Agent", b.userAgent)
+
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+
+	doc, err := goquery.NewDocumentFromReader(res.Body)
+	if err != nil {
+		return err
+	}
+	b.doc = doc
+	b.baseSel = doc.Find(`#b_results > li`)
+	b.initDone = true
+	return nil
+}
+
+func (b *Bing) Each(eachCb func(int) error) error {
+	for i := 0; i < b.baseSel.Length(); i++ {
+		err := eachCb(i)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (b *Bing) Title(i int) (string, error) {
+	return get(b.baseSel, i).ChildrenFiltered("h2").Children().First().Text(), nil
+}
+
+func (b *Bing) Link(i int) (string, error) {
+	return get(b.baseSel, i).ChildrenFiltered("h2").Children().First().AttrOr("href", ""), nil
+}
+
+func (b *Bing) Desc(i int) (string, error) {
+	return get(b.baseSel, i).ChildrenFiltered(".b_caption").Children().Last().Text(), nil
+}
+
+func (b *Bing) Name() string {
+	return "bing"
+}

search/web/ddg.go

@@ -0,0 +1,103 @@
+package web
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/PuerkitoBio/goquery"
+)
+
+var ddgURL = urlMustParse("https://html.duckduckgo.com/html")
+
+const uddgPrefix = "//duckduckgo.com/l/?uddg="
+
+type DDG struct {
+	keyword   string
+	userAgent string
+	page      int
+	doc       *goquery.Document
+	initDone  bool
+	baseSel   *goquery.Selection
+}
+
+func (d *DDG) SetKeyword(keyword string) {
+	d.keyword = keyword
+}
+
+func (d *DDG) SetPage(page int) {
+	d.page = page * 30
+}
+
+func (d *DDG) SetUserAgent(ua string) {
+	d.userAgent = "Opera/9.80 (Windows NT 5.1; U; zh-tw) Presto/2.8.131 Version/11.10" //ua
+}
+
+func (d *DDG) Init() error {
+	initURL := copyURL(ddgURL)
+	query := initURL.Query()
+	query.Set("q", d.keyword)
+	if d.page > 0 {
+		query.Set("s", strconv.Itoa(d.page))
+		query.Set("dc", strconv.Itoa(d.page+1))
+	}
+	initURL.RawQuery = query.Encode()
+
+	req, err := http.NewRequest(
+		http.MethodGet,
+		initURL.String(),
+		nil,
+	)
+	if err != nil {
+		return err
+	}
+	if d.userAgent == "" {
+		d.userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36"
+	}
+	req.Header.Set("User-Agent", d.userAgent)
+
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+
+	doc, err := goquery.NewDocumentFromReader(res.Body)
+	if err != nil {
+		return err
+	}
+	d.doc = doc
+	d.baseSel = doc.Find(`#links > .result`)
+	d.initDone = true
+	return nil
+}
+
+func (d *DDG) Each(eachCb func(int) error) error {
+	for i := 0; i < d.baseSel.Length(); i++ {
+		err := eachCb(i)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (d *DDG) Title(i int) (string, error) {
+	return strings.TrimSpace(get(d.baseSel, i).Children().First().ChildrenFiltered("h2").Text()), nil
+}
+
+func (d *DDG) Link(i int) (string, error) {
+	link := get(d.baseSel, i).Children().First().ChildrenFiltered("a").AttrOr("href", "")
+	if strings.HasPrefix(link, uddgPrefix) {
+		link = urlMustParse(link).Query().Get("uddg")
+	}
+	return link, nil
+}
+
+func (d *DDG) Desc(i int) (string, error) {
+	return get(d.baseSel, i).Children().First().ChildrenFiltered("a").Text(), nil
+}
+
+func (d *DDG) Name() string {
+	return "ddg"
+}

search/web/google.go

@@ -0,0 +1,108 @@
+package web
+
+import (
+	"net/http"
+	"net/url"
+	"strconv"
+
+	"github.com/PuerkitoBio/goquery"
+)
+
+var googleURL = urlMustParse("https://www.google.com/search")
+
+type Google struct {
+	keyword   string
+	userAgent string
+	page      int
+	doc       *goquery.Document
+	initDone  bool
+	baseSel   *goquery.Selection
+}
+
+func (g *Google) SetKeyword(keyword string) {
+	g.keyword = keyword
+}
+
+func (g *Google) SetPage(page int) {
+	g.page = page * 10
+}
+
+func (g *Google) SetUserAgent(ua string) {
+	g.userAgent = ua
+}
+
+func (g *Google) Init() error {
+	initURL := copyURL(googleURL)
+	query := initURL.Query()
+	query.Set("q", g.keyword)
+	query.Set("start", strconv.Itoa(g.page))
+	initURL.RawQuery = query.Encode()
+	req, err := http.NewRequest(
+		http.MethodGet,
+		initURL.String(),
+		nil,
+	)
+	if err != nil {
+		return err
+	}
+	if g.userAgent == "" {
+		g.userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36"
+	}
+	req.Header.Set("User-Agent", g.userAgent)
+
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+
+	doc, err := goquery.NewDocumentFromReader(res.Body)
+	if err != nil {
+		return err
+	}
+	g.doc = doc
+	g.baseSel = doc.Find(`a > h3`)
+	g.initDone = true
+	return nil
+}
+
+func (g *Google) Each(eachCb func(int) error) error {
+	for i := 0; i < g.baseSel.Length(); i++ {
+		err := eachCb(i)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (g *Google) Title(i int) (string, error) {
+	return get(g.baseSel, i).Text(), nil
+}
+
+func (g *Google) Link(i int) (string, error) {
+	return get(g.baseSel, i).Parent().AttrOr("href", ""), nil
+}
+
+func (g *Google) Desc(i int) (string, error) {
+	return get(g.baseSel, i).Parent().Parent().Next().Text(), nil
+}
+
+func (g *Google) Name() string {
+	return "google"
+}
+
+func get(sel *goquery.Selection, i int) *goquery.Selection {
+	return sel.Slice(i, i+1)
+}
+
+func urlMustParse(urlStr string) *url.URL {
+	out, _ := url.Parse(urlStr)
+	return out
+}
+
+func copyURL(orig *url.URL) *url.URL {
+	newURL := new(url.URL)
+	*newURL = *orig
+	return newURL
+}

search/web/search.go

@@ -0,0 +1,151 @@
+package web
+
+import (
+	"net/http"
+	"sort"
+	"sync"
+	"time"
+
+	"golang.org/x/sync/errgroup"
+)
+
+func init() {
+	http.DefaultClient.Timeout = 5 * time.Second
+}
+
+type Result struct {
+	Title   string
+	Link    string
+	Desc    string
+	Engines []string
+	Rank    int
+}
+
+type Engine interface {
+	// Set search keyword for engine
+	SetKeyword(string)
+
+	// Set User Agent. If string is empty,
+	// an acceptable will should be used.
+	SetUserAgent(string)
+
+	// Set page number to search
+	SetPage(int)
+
+	// Initialize engine (make requests, set variables, etc.)
+	Init() error
+
+	// Run function for each search result,
+	// inputting index
+	Each(func(int) error) error
+
+	// Get title from index given by Each()
+	Title(int) (string, error)
+	// Get link from index given by Each()
+	Link(int) (string, error)
+	// Get description from index given by Each()
+	Desc(int) (string, error)
+
+	// Return shortened name of search engine.
+	// Should be lowercase (e.g. google, ddg, bing)
+	Name() string
+}
+
+type Options struct {
+	Keyword   string
+	UserAgent string
+	Page      int
+}
+
+func Search(opts Options, engines ...Engine) ([]*Result, error) {
+	var outMtx sync.Mutex
+	var out []*Result
+
+	wg := errgroup.Group{}
+	for index, engine := range engines {
+		curIndex, curEngine := index, engine
+		wg.Go(func() error {
+
+			curEngine.SetKeyword(opts.Keyword)
+			curEngine.SetUserAgent(opts.UserAgent)
+			curEngine.SetPage(opts.Page)
+
+			if err := curEngine.Init(); err != nil {
+				return err
+			}
+
+			err := curEngine.Each(func(i int) error {
+				link, err := curEngine.Link(i)
+				if err != nil {
+					return err
+				}
+
+				rank := (curIndex * 100) + i
+
+				index, exists := linkExists(out, link)
+				if exists {
+					out[index].Engines = append(out[index].Engines, curEngine.Name())
+					if rank < out[index].Rank {
+						out[index].Rank = rank
+					}
+					return nil
+				}
+
+				title, err := curEngine.Title(i)
+				if err != nil {
+					return err
+				}
+
+				desc, err := curEngine.Desc(i)
+				if err != nil {
+					return err
+				}
+
+				if title == "" || link == "" || desc == "" {
+					return nil
+				}
+
+				if len(desc) > 500 {
+					desc = desc[:500] + "..."
+				}
+
+				result := &Result{
+					Title: title,
+					Link:  link,
+					Desc:  desc,
+					Rank:  rank,
+				}
+				result.Engines = append(result.Engines, curEngine.Name())
+
+				outMtx.Lock()
+				out = append(out, result)
+				outMtx.Unlock()
+
+				return nil
+			})
+			if err != nil {
+				return err
+			}
+
+			sort.Slice(out, func(i, j int) bool {
+				return out[i].Rank < out[j].Rank
+			})
+			return nil
+		})
+	}
+
+	if err := wg.Wait(); err != nil {
+		return out, err
+	}
+
+	return out, nil
+}
+
+func linkExists(results []*Result, link string) (int, bool) {
+	for index, result := range results {
+		if result.Link == link {
+			return index, true
+		}
+	}
+	return -1, false
+}

templates/base.html

@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>{{template "page" .}} - {{.Config "site.name"}}</title>
+        <link rel="search" type="application/opensearchdescription+xml" title='{{.Config "site.name"}}' href="/opensearch">
+        <link rel="stylesheet" href="/static/bulma.min.css">
+        <script async src="/static/iconify.min.js"></script>
+        {{if .Card}}
+        {{.Card.Head}}
+        {{end}}
+    </head>
+    <body>
+        {{template "body" .}}
+
+        {{if .Config "page.results.footer.enabled"}}
+        <section id="footer" class="px-4 py-0 has-background-light is-fullwidth mt-3">
+            <div class="columns">
+                <div class="column is-one-quarter has-text-left is-hidden-mobile">
+                    <p>Rendered in {{.LoadTime}}</p>
+                </div>
+                <div class="column has-text-right has-text-centered-mobile">
+                    <p class="is-hidden-mobile">Powered by Scope &mdash; A simple and minimal metasearch engine</span>
+                    <div>
+                        Licensed under the
+                        <a href="https://www.gnu.org/licenses/agpl-3.0-standalone.html">AGPLv3</a>.
+                        <a href='{{.Config "site.sourceURL"}}'>Source Code</a>.
+                    </div>
+                </div>
+            </div>
+        </section>
+        {{end}}
+    </body>
+</html>

templates/error.html

@@ -0,0 +1,16 @@
+{{define "page"}}
+Error
+{{end}}
+
+{{define "body"}}
+<section class="hero is-fullheight">
+    <div class="hero-body">
+        <div class="container has-text-centered">
+            <p class="title">{{.Message}} ({{.Status}})</p>
+            {{if .ErrExists}}
+            <p>{{.Error}}</p>
+            {{end}}
+        </div>
+    </div>
+</section>
+{{end}}

templates/home.html

@@ -0,0 +1,27 @@
+{{define "page"}}
+Home
+{{end}}
+
+{{define "body"}}
+<section class="hero is-fullheight">
+    <div class="hero-body">
+        <div class="container has-text-centered">
+            <p class="title">
+                {{.Config "site.name"}}
+            </p>
+            <form action="/search">
+                <dic class="columns is-centered">
+                    <div class="column is-three-quarters">
+                        <input id="search-input" class="input is-link is-rounded" type="text" name="q"
+                            placeholder="Search...">
+                    </div>
+                </dic>
+                <button class="button is-link is-rounded" type="submit">
+                    <span class="iconify" data-icon="fe:search"></span>&nbsp;
+                    Search
+                </button>
+            </form>
+        </div>
+    </div>
+</section>
+{{end}}

templates/opensearch.xml

@@ -0,0 +1,10 @@
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/"
+                       xmlns:moz="http://www.mozilla.org/2006/browser/search/">
+  <ShortName>{{.Config "site.name"}}</ShortName>
+  <Description>{{.Config "site.name"}} — A simple and minimal metasearch engine</Description>
+  <InputEncoding>UTF-8</InputEncoding>
+  <Url type="text/html" template='{{.Config "site.baseURL"}}/search'>
+    <Param name="q" value="{searchTerms}"/>
+  </Url>
+  <moz:SearchForm>{{.Config "site.baseURL"}}/search</moz:SearchForm>
+</OpenSearchDescription>

templates/result.html

@@ -0,0 +1,96 @@
+{{define "page"}}
+{{- .Keyword -}}
+{{end}}
+
+{{define "body"}}
+<!-- Search bar -->
+<section id="search" class="section p-4">
+    <form action="/search">
+        <div class="columns">
+            {{if .Config "page.results.searchbar.homeBtn"}}
+            <div class="column has-text-centered px-1 is-1">
+                <a class="button is-fullwidth is-success is-rounded" href="/">
+                    <span class="iconify" data-icon="fluent:home-12-regular"></span>
+                </a>
+            </div>
+            {{end}}
+            <div id="search-bar" class="column">
+                <input id="search-input" class="input is-link is-rounded" type="text" name="q" placeholder="Search"
+                    value="{{.Keyword}}">
+            </div>
+            <div class="column has-text-centered px-1 is-1">
+                <button class="button is-fullwidth is-link is-rounded" type="submit">
+                    <span class="iconify" data-icon="fe:search"></span>
+                </button>
+            </div>
+            {{if .Config "page.results.searchbar.resetBtn"}}
+            <div class="column has-text-centered px-1 is-1">
+                <a class="button is-fullwidth is-danger is-rounded" href="#"
+                    onclick="document.getElementById('search-input').value = ''">
+                    <span class="iconify" data-icon="akar-icons:cross"></span>
+                </a>
+            </div>
+            {{end}}
+        </div>
+    </form>
+</section>
+
+{{if .Card}}
+<div id="answer" class="container py-6">
+    <div class="card has-background-light">
+        <div class="card-content">
+            <p class="title" id="card-title">{{.Card.Title}}</p>
+            <div class="content">
+                {{html .Card.Content}}
+            </div>
+        </div>
+        {{.Card.Footer}}
+    </div>
+</div>
+{{end}}
+
+<!-- Results -->
+<section id="results" class="section container py-4 px-6">
+    {{if eq (len .Results) 0}}
+    <p class="has-text-centered">No results</p>
+    {{end}}
+    {{- range $index, $result := .Results }}
+    <div id="result-{{$index}}">
+        <a href="{{$result.Link}}">{{$result.Title}}</a>
+        <p>{{$result.Desc}}</p>
+        {{if $.Config "page.results.showLink"}}
+        <p class="has-text-success">{{$result.Link}}</p>
+        {{end}}
+        <div class="columns">
+            {{if $.Config "page.results.engineTags"}}
+            <div class="column has-text-left">
+                {{- range $engine := $result.Engines }}
+                <span class="tag is-light px-2">{{$engine}}</span>
+                {{end}}
+            </div>
+            {{end}}
+            {{if $.Config "page.results.cachedLink"}}
+            <div class="column has-text-right">
+                <a href="https://web.archive.org/web/{{$result.Link}}">
+                    <span class="iconify" data-icon="ic:baseline-cached" data-inline="true"></span>
+                    Cached
+                </a>
+            </div>
+            {{end}}
+        </div>
+        <hr>
+    </div>
+    {{end}}
+</section>
+
+{{if ne (len .Results) 0}}
+<!-- Pagination -->
+<section id="pagination" class="section container has-text-centered">
+    <a class="button is-rounded is-link" {{if eq .Page
+        0}}disabled{{else}}href="/search?q={{.Keyword}}&page={{sub .Page 1}}" {{end}}>Prev</a>
+    <a class="button is-link mx-4" style="cursor:default;"><span class="icon">{{.Page}}</span></a>
+    <a class="button is-rounded is-link" href="/search?q={{.Keyword}}&page={{add .Page 1}}">Next</a>
+</section>
+{{end}}
+
+{{end}}