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topics.go
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package main
import (
"bufio"
"encoding/json"
"fmt"
"html/template"
"os"
"sort"
"strconv"
"strings"
"github.com/aclements/go-moremath/stats"
)
type Topic struct {
Name string
Submissions []*Submission
}
func topics(id int, input, knockout string) {
path := fmt.Sprintf("papercall.%d.json", id)
subs := submissions(path)
ko := knockouts(knockout)
f, err := os.Open(input)
check(err)
defer f.Close()
sc := bufio.NewScanner(f)
var topics []Topic
for sc.Scan() {
fields := strings.Fields(sc.Text())
topic := Topic{
Name: strings.ReplaceAll(fields[0], "-", " "),
}
for _, f := range fields[1:] {
id, err := strconv.ParseInt(f, 10, 64)
check(err)
// is this id on the knockout list?
if ko[int(id)] {
continue // yes? skip it
}
s, ok := subs[int(id)]
if ok {
topic.Submissions = append(topic.Submissions, s)
}
}
sort.SliceStable(topic.Submissions, func(i, j int) bool {
return topic.Submissions[i].Rating > topic.Submissions[j].Rating
})
topics = append(topics, topic)
}
sort.SliceStable(topics, func(i, j int) bool {
return topics[i].Name < topics[j].Name
})
t, err := template.New("topics").Funcs(map[string]interface{}{
"mean": meanRating,
"stddev": stddevRating,
"diff": diffRatings,
}).Parse(topicsT)
check(err)
fi, err := os.Stat(path)
check(err)
err = t.Execute(os.Stdout, map[string]interface{}{
"cfp": 1642, // cannot figure out how to get this from the API
"Topics": topics,
"inputfile": fi,
})
check(err)
}
func knockouts(path string) map[int]bool {
f, err := os.Open(path)
check(err)
defer f.Close()
ko := make(map[int]bool)
sc := bufio.NewScanner(f)
for sc.Scan() {
for _, f := range strings.Fields(sc.Text()) {
id, err := strconv.ParseInt(f, 10, 64)
check(err)
ko[int(id)] = true
}
}
return ko
}
const topicsT = `<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
<title>GopherCon 2019 topic breakdown</title>
</head>
<body>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
<div class="container">
<h1>GopherCon 2019 topic breakdown</h1>
<p>Ratings last updated: {{.inputfile.ModTime}}</p>
<base href="https://www.papercall.io/cfps/{{.cfp}}/submissions/">
<ol>
{{ range .Topics }}
<li><h2>{{ .Name }}</h1>
{{ range .Submissions }}
<div class="row justify-content-md-left">
<div class="col-6">
{{ if eq .State "rejected" }}<s>{{ end }}
<a href="{{.Id}}">{{ .Talk.Title }}</a>
{{ if eq .State "rejected" }}</s>{{ end }}
</div>
<div class="col-3">{{.Talk.Format }}</div>
<div class="col-2">{{ mean .Ratings | printf "%.0f" }} ± {{ stddev .Ratings | printf "%.0f" }}</div>
<div class="col-1">{{.State }}</div>
</div>
{{ end }}
</li>
{{ end }}
</div>
</body>
</html>
`
func meanRating(ratings []Rating) float64 {
values := make([]float64, 0, len(ratings))
for _, r := range ratings {
values = append(values, float64(r.Value))
}
return stats.Mean(values)
}
func stddevRating(ratings []Rating) float64 {
return stats.StdDev(values(ratings))
}
func values(ratings []Rating) []float64 {
values := make([]float64, 0, len(ratings))
for _, r := range ratings {
values = append(values, float64(r.Value))
}
return values
}
func computeStats(ratings []Rating) (min, max, mean float64) {
// Discard outliers.
values := stats.Sample{Xs: values(ratings)}
q1, q3 := values.Quantile(0.25), values.Quantile(0.75)
var rvalues []float64
lo, hi := q1-1.5*(q3-q1), q3+1.5*(q3-q1)
for _, value := range values.Xs {
if lo <= value && value <= hi {
rvalues = append(rvalues, value)
}
}
// Compute statistics of remaining data.
min, max = stats.Bounds(rvalues)
mean = stats.Mean(rvalues)
return
}
func diffRatings(ratings []Rating) float64 {
min, max, mean := computeStats(ratings)
diff := 1 - min/mean
if d := max/mean - 1; d > diff {
diff = d
}
return diff * 100
}
func submissions(path string) map[int]*Submission {
f, err := os.Open(path)
check(err)
defer f.Close()
var subs []Submission
dec := json.NewDecoder(f)
err = dec.Decode(&subs)
check(err)
result := make(map[int]*Submission)
for i := range subs {
s := &subs[i]
result[s.Id] = s
}
return result
}