@@ -0,0 +1,2 @@
+habits.tsv
+privychka

@@ -0,0 +1,3 @@
+module git.icyphox.sh/privychka
+
+go 1.17

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+package main
+
+import (
+	"encoding/csv"
+	"encoding/json"
+	"errors"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"time"
+)
+
+type Habit struct {
+	Time     time.Time `json:"time"`
+	Activity string    `json:"activity"`
+	Notes    string    `json:"notes,omitempty"`
+}
+
+func (h Habit) String() string {
+	t := h.Time.Format(time.RFC1123Z)
+	return fmt.Sprintf(
+		"time: %s  activity: %s  notes:  %s",
+		t,
+		h.Activity,
+		h.Notes,
+	)
+}
+
+func (h Habit) WriteTSV(fname string) error {
+	record := []string{}
+
+	f, err := os.OpenFile(fname, os.O_APPEND|os.O_WRONLY, 0644)
+	if err != nil {
+		return err
+	}
+
+	w := csv.NewWriter(f)
+	w.Comma = '\t'
+	t := h.Time.Format(time.RFC1123)
+
+	record = append(record, t, h.Activity, h.Notes)
+	if err := w.Write(record); err != nil {
+		return err
+	}
+
+	w.Flush()
+	if err := w.Error(); err != nil {
+		return err
+	}
+
+	defer f.Close()
+
+	return nil
+}
+
+func main() {
+	hFile := *flag.String("f", "./habits.tsv", "csv file to store habit data")
+	flag.Parse()
+
+	if _, err := os.Stat(hFile); errors.Is(err, os.ErrNotExist) {
+		_, err := os.Create(hFile)
+		if err != nil {
+			log.Fatalf(err.Error())
+		}
+	}
+
+	http.HandleFunc("/submit", func(w http.ResponseWriter, r *http.Request) {
+		h := Habit{}
+		json.NewDecoder(r.Body).Decode(&h)
+		log.Printf(h.String())
+
+		if err := h.WriteTSV(hFile); err != nil {
+			log.Printf("error: %v\n", err)
+			w.WriteHeader(500)
+		}
+		w.WriteHeader(204)
+	})
+
+	http.ListenAndServe(":8585", nil)
+}

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+privychka
+---------
+
+Habit tracking service.