add basic go program

.gitignore

@@ -1 +1,2 @@
 *.db
+xbit

go.mod

@@ -0,0 +1,5 @@
+module dairydemon.net/xbit
+
+go 1.19
+
+require github.com/mattn/go-sqlite3 v1.14.22

go.sum

@@ -0,0 +1,2 @@
+github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
+github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=

main.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"database/sql"
+	"flag"
+	"fmt"
+	_ "github.com/mattn/go-sqlite3"
+	"log"
+	"math"
+	"time"
+)
+
+type Event struct {
+	description string
+	timestamp   int64
+}
+
+func formula(p float64) int64 {
+	yearsAgo := math.Exp(20.3444*math.Pow(p, 3)+3) - math.Exp(3)
+	return int64(yearsAgo * 31556926)
+}
+
+func closestEvent(t int64, db *sql.DB) (Event, error) {
+	var event Event
+	query := `
+	select description, timestamp
+	from events
+	where timestamp is not null
+	order by abs(? - timestamp) asc
+	limit 1
+	`
+
+	stmt, err := db.Prepare(query)
+	if err != nil {
+		return event, err
+	}
+	defer stmt.Close()
+
+	err = stmt.QueryRow(t).Scan(&event.description, &event.timestamp)
+	return event, err
+}
+
+func main() {
+	percent := flag.Float64("p", -1, "percentage")
+	flag.Parse()
+
+	if *percent < 0 || *percent > 1 {
+		log.Fatal("invalid percentage")
+	}
+
+	t := time.Now().Unix() - formula(*percent)
+
+	db, err := sql.Open("sqlite3", "./timeline.db")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	event, err := closestEvent(t, db)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	date := time.Unix(event.timestamp, 0)
+	fmt.Printf("%v\t%v\t%v\n", event.timestamp, date, event.description)
+}