Create README with quickstart guide

Add comprehensive README.md documentation:
- Project description
- Installation instructions (go get)
- Quick start example with client init, list checklists, create task
- API overview for Checklists, Tasks, Notes
- Due date helpers (DueToday, DueTomorrow, DueAt, DueInDays)
- TaskBuilder fluent interface examples
- Error handling with sentinel errors
- Configuration options (timeout, retry, logger)
- Authentication section (auto, 2FA, current user)
- Link to pkg.go.dev documentation
- MIT license reference

Closes checkvist-api-nrk
This commit is contained in:
Oliver Jakoubek 2026-01-14 13:48:37 +01:00
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# checkvist-api
A type-safe, idiomatic Go client library for the [Checkvist](https://checkvist.com/) API.
## Installation
```bash
go get code.beautifulmachines.dev/jakoubek/checkvist-api
```
## Quick Start
```go
package main
import (
"context"
"fmt"
"log"
"code.beautifulmachines.dev/jakoubek/checkvist-api"
)
func main() {
// Create a new client
client := checkvist.NewClient("your-email@example.com", "your-api-key")
ctx := context.Background()
// List all checklists
checklists, err := client.Checklists().List(ctx)
if err != nil {
log.Fatal(err)
}
for _, cl := range checklists {
fmt.Printf("Checklist: %s (%d tasks)\n", cl.Name, cl.TaskCount)
}
// Create a new task
task, err := client.Tasks(checklists[0].ID).Create(ctx,
checkvist.NewTask("Buy groceries").
WithDueDate(checkvist.DueTomorrow).
WithPriority(1).
WithTags("shopping", "personal"),
)
if err != nil {
log.Fatal(err)
}
fmt.Printf("Created task: %s (ID: %d)\n", task.Content, task.ID)
}
```
## API Overview
### Checklists
```go
// List all checklists
checklists, err := client.Checklists().List(ctx)
// List archived checklists
archived, err := client.Checklists().ListWithOptions(ctx, checkvist.ListOptions{Archived: true})
// Get a single checklist
checklist, err := client.Checklists().Get(ctx, checklistID)
// Create a new checklist
checklist, err := client.Checklists().Create(ctx, "My New List")
// Update a checklist
checklist, err := client.Checklists().Update(ctx, checklistID, "New Name")
// Delete a checklist
err := client.Checklists().Delete(ctx, checklistID)
```
### Tasks
```go
// List all tasks in a checklist
tasks, err := client.Tasks(checklistID).List(ctx)
// Get a single task
task, err := client.Tasks(checklistID).Get(ctx, taskID)
// Create a task with the builder pattern
task, err := client.Tasks(checklistID).Create(ctx,
checkvist.NewTask("Task content").
WithParent(parentID). // Create as subtask
WithDueDate(checkvist.DueAt(time.Now().AddDate(0, 0, 7))).
WithPriority(1). // 1 = highest, 2 = high, 0 = normal
WithTags("work", "urgent"),
)
// Update a task
content := "Updated content"
task, err := client.Tasks(checklistID).Update(ctx, taskID, checkvist.UpdateTaskRequest{
Content: &content,
})
// Close/Reopen/Invalidate tasks
task, err := client.Tasks(checklistID).Close(ctx, taskID)
task, err := client.Tasks(checklistID).Reopen(ctx, taskID)
task, err := client.Tasks(checklistID).Invalidate(ctx, taskID)
// Delete a task
err := client.Tasks(checklistID).Delete(ctx, taskID)
```
### Notes (Comments)
```go
// List notes on a task
notes, err := client.Notes(checklistID, taskID).List(ctx)
// Create a note
note, err := client.Notes(checklistID, taskID).Create(ctx, "My comment")
// Update a note
note, err := client.Notes(checklistID, taskID).Update(ctx, noteID, "Updated comment")
// Delete a note
err := client.Notes(checklistID, taskID).Delete(ctx, noteID)
```
### Due Dates
The library provides convenient due date helpers:
```go
// Predefined constants
checkvist.DueToday
checkvist.DueTomorrow
checkvist.DueNextWeek
checkvist.DueNextMonth
// From time.Time
checkvist.DueAt(time.Now().AddDate(0, 0, 7))
// Relative days
checkvist.DueInDays(5)
// Raw smart syntax
checkvist.DueString("^friday")
```
## Error Handling
The library provides structured error types for API errors:
```go
task, err := client.Tasks(checklistID).Get(ctx, taskID)
if err != nil {
// Check for specific error types
if errors.Is(err, checkvist.ErrNotFound) {
fmt.Println("Task not found")
} else if errors.Is(err, checkvist.ErrUnauthorized) {
fmt.Println("Invalid credentials")
} else if errors.Is(err, checkvist.ErrRateLimited) {
fmt.Println("Too many requests, please slow down")
}
// Get detailed error information
var apiErr *checkvist.APIError
if errors.As(err, &apiErr) {
fmt.Printf("Status: %d, Message: %s\n", apiErr.StatusCode, apiErr.Message)
}
}
```
Available sentinel errors:
- `ErrUnauthorized` - Invalid credentials (HTTP 401)
- `ErrNotFound` - Resource not found (HTTP 404)
- `ErrRateLimited` - Rate limit exceeded (HTTP 429)
- `ErrBadRequest` - Invalid request (HTTP 400)
- `ErrServerError` - Server error (HTTP 5xx)
## Configuration Options
Customize the client with functional options:
```go
client := checkvist.NewClient("email", "api-key",
// Custom HTTP client
checkvist.WithHTTPClient(customHTTPClient),
// Custom timeout
checkvist.WithTimeout(60 * time.Second),
// Custom retry configuration
checkvist.WithRetryConfig(checkvist.RetryConfig{
MaxRetries: 5,
BaseDelay: 2 * time.Second,
MaxDelay: 60 * time.Second,
Jitter: true,
}),
// Custom logger
checkvist.WithLogger(slog.New(slog.NewJSONHandler(os.Stdout, nil))),
// Custom base URL (for testing)
checkvist.WithBaseURL("https://custom-api.example.com"),
)
```
## Authentication
The library handles authentication automatically:
- Authenticates on first API call
- Stores token securely
- Automatically refreshes token before expiry
- Thread-safe for concurrent use
You can also authenticate explicitly:
```go
// Standard authentication
err := client.Authenticate(ctx)
// With 2FA
err := client.AuthenticateWith2FA(ctx, "123456")
// Get current user info
user, err := client.CurrentUser(ctx)
```
## Documentation
Full API documentation is available on [pkg.go.dev](https://pkg.go.dev/code.beautifulmachines.dev/jakoubek/checkvist-api).
## License
MIT License - see [LICENSE](LICENSE) file for details.