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|
package main
import (
"bufio"
"bytes"
"context"
"fmt"
"io"
"log"
"net/http"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"time"
"github.com/cenkalti/backoff/v5"
"github.com/robfig/cron/v3"
)
type InputLine struct {
RawSchedule, RawTask string
}
type TaskAddingJob struct {
Schedule cron.Schedule
Task cron.Job
EntryID cron.EntryID // this doesn't fit super well, but we'll figure that out soon I guess
Delete bool
}
type Task struct {
Name string
}
func (t Task) Run() {
_, err := backoff.Retry(context.Background(), func() (bool, error) { return true, createTask(t.Name) }, backoff.WithBackOff(backoff.NewExponentialBackOff()))
if err != nil {
log.Printf("Failed to create task '%s': %s", t.Name, err)
}
}
var jobsFromInput = map[InputLine]TaskAddingJob{}
var todoistToken string
var httpClient = http.Client{
Timeout: 10 * time.Second,
}
func main() {
if err := setToken(); err != nil {
log.Fatalf("setting token: %s", err)
}
p, err := inputFilePath()
if err != nil {
log.Fatalf("getting input file: %s", err)
}
log.Printf("Started watching '%s'", p)
c := cron.New()
c.Start()
for {
err = readInput(p)
if err != nil {
log.Printf("Error reading input: %s", err)
continue
}
for inputLine, taskAddingJob := range jobsFromInput {
if jobsFromInput[inputLine].EntryID == 0 {
taskAddingJob.EntryID = c.Schedule(
jobsFromInput[inputLine].Schedule,
jobsFromInput[inputLine].Task,
)
jobsFromInput[inputLine] = taskAddingJob
log.Printf(
"Added '%s' with recurrence '%s'",
inputLine.RawTask,
inputLine.RawSchedule,
)
} else if taskAddingJob.Delete {
c.Remove(taskAddingJob.EntryID)
delete(jobsFromInput, inputLine)
log.Printf("Removed '%s'", inputLine.RawTask)
}
}
time.Sleep(time.Minute)
}
}
func setToken() error {
token := os.Getenv("TODOIST_TOKEN")
if token == "" {
return fmt.Errorf("TODOIST_TOKEN env var must be present and non-empty")
}
todoistToken = token
return nil
}
func inputFilePath() (string, error) {
args := os.Args
if len(args) != 2 {
return "", fmt.Errorf("expected one argument (input file path), got %d", len(args)-1)
}
p := filepath.Clean(args[1])
// While we're here, check that the input path actually exists and
// is stat-able.
if _, err := os.Stat(p); err != nil {
return "", fmt.Errorf("cannot stat input file: %w", err)
}
return p, nil
}
var inputFileRe = regexp.MustCompile(`([^\s]+\s+[^\s]+\s+[^\s]+\s+[^\s]+\s+[^\s]+)\s+(.*)`)
func readInput(p string) error {
f, err := os.Open(p)
if err != nil {
return fmt.Errorf("opening '%s': %w", p, err)
}
defer f.Close()
previousInput := map[InputLine]struct{}{}
for k := range jobsFromInput {
previousInput[k] = struct{}{}
}
currentInput := map[InputLine]struct{}{}
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if line == "" || strings.HasPrefix(line, "#") {
continue
}
matches := inputFileRe.FindStringSubmatch(line)
if matches == nil || len(matches) != 1+2 {
log.Printf("failed to parse input line: '%s'", line)
continue
}
inputLine := InputLine{
RawSchedule: matches[1],
RawTask: matches[2],
}
currentInput[inputLine] = struct{}{}
if _, ok := previousInput[inputLine]; ok {
continue
}
schedule, err := cron.ParseStandard(inputLine.RawSchedule)
if err != nil {
log.Printf(
"Failed to add '%s' with recurrence '%s': %s",
inputLine.RawTask,
inputLine.RawSchedule,
err,
)
continue
}
jobsFromInput[inputLine] = TaskAddingJob{
Schedule: schedule,
Task: Task{Name: inputLine.RawTask},
}
}
if err := scanner.Err(); err != nil {
return fmt.Errorf("scanning: %w", err)
}
// Mark stuff that we previously saw, but is now missing, for pruning.
for k := range previousInput {
if _, ok := currentInput[k]; !ok {
v := jobsFromInput[k]
v.Delete = true
jobsFromInput[k] = v
}
}
return nil
}
func createTask(task string) error {
jsonBody := []byte(fmt.Sprintf(`{"content": %s}`, strconv.Quote(task)))
req, err := http.NewRequest(
http.MethodPost,
"https://api.todoist.com/api/v1/tasks",
bytes.NewBuffer(jsonBody),
)
if err != nil {
return fmt.Errorf("creating request: %w", err)
}
req.Header.Add("Authorization", "Bearer "+todoistToken)
req.Header.Set("Content-Type", "application/json")
resp, err := httpClient.Do(req)
if err != nil {
return fmt.Errorf("doing request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
bodyBytes, err := io.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("reading body when preparing error message (HTTP status was %d): %w", resp.StatusCode, err)
}
return fmt.Errorf("expected 200, got status code %d: body was %s", resp.StatusCode, strconv.Quote(string(bodyBytes)))
}
log.Printf("Created task '%s'", task)
return nil
}
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