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package todotxt
import (
"errors"
"fmt"
"strings"
"time"
)
// Item represents todotxt task
type Item struct {
Complete bool
Priority *Priority
CompletionDate *time.Time
CreationDate *time.Time
Description string
Tags []Tag
}
// String returns text representation of Item
func (i *Item) String() string {
result := ""
if i.Complete {
result = "x "
}
if i.Priority != nil {
result += "(" + i.Priority.String() + ") "
}
if i.CompletionDate != nil {
result += i.CompletionDate.Format("2006-01-02") + " "
if i.CreationDate != nil {
result += i.CreationDate.Format("2006-01-02") + " "
} else {
result += time.Now().Format("2006-01-02") + " "
}
} else if i.CreationDate != nil {
result += i.CreationDate.Format("2006-01-02") + " "
}
result += i.Description + " "
for _, t := range i.Tags {
switch t.Key {
case TagContext:
result += "@" + t.Value + " "
case TagProject:
result += "+" + t.Value + " "
default:
result += t.Key + ":" + t.Value + " "
}
}
return strings.Trim(result, " \n")
}
// Parse multiline todotxt string
func Parse(todo string) ([]Item, error) {
lines := strings.Split(todo, "\n")
items := make([]Item, 0, len(lines))
for ln, line := range lines {
i, err := ParseLine(line)
if err != nil {
return nil, fmt.Errorf("error at line %d: %v", ln, err)
}
items = append(items, i)
}
return items, nil
}
// ParseLine parses single todotxt line
func ParseLine(line string) (Item, error) {
i := Item{}
tokens := strings.Split(line, " ")
state := 0
for _, t := range tokens {
if state == 0 && t == "x" {
state = 1
i.Complete = true
continue
}
if state <= 1 && len(t) == 3 && t[0] == '(' && t[2] == ')' {
p, err := PriorityFromLetter(string(t[1]))
if err != nil {
return i, err
}
i.Priority = &p
state = 2
continue
}
if state <= 2 {
ti, err := time.Parse("2006-01-02", t)
if err == nil {
i.CreationDate = &ti
state = 3
continue
}
state = 4
}
if state <= 3 {
ti, err := time.Parse("2006-01-02", t)
if err == nil {
i.CompletionDate = i.CreationDate
i.CreationDate = &ti
state = 4
continue
}
state = 4
}
if t[0] == '+' {
i.Tags = append(i.Tags, Tag{
Key: TagProject,
Value: string(t[1:]),
})
continue
}
if t[0] == '@' {
i.Tags = append(i.Tags, Tag{
Key: TagContext,
Value: string(t[1:]),
})
continue
}
kv := strings.Split(t, ":")
if len(kv) == 2 {
i.Tags = append(i.Tags, Tag{
Key: kv[0],
Value: kv[1],
})
continue
}
if i.Description == "" {
i.Description = t
} else {
i.Description += " " + t
}
}
return i, nil
}
type Priority int
// String returns letter by priority (0=A, 1=B, 2=C ...)
func (p Priority) String() string {
return string([]byte{byte(p + 65)})
}
// PriorityFromLetter returns numeric priority from letter priority (A=0, B=1, C=2 ...)
func PriorityFromLetter(letter string) (Priority, error) {
if len(letter) != 1 {
return 0, errors.New("incorrect priority length")
}
code := []byte(letter)[0]
if code < 65 || code > 90 {
return 0, errors.New("priority must be between A and Z")
}
return Priority(code - 65), nil
}
// TagContext constant is key for context tag
const TagContext = "@context"
// TagProject constant is key for project tag
const TagProject = "+project"
// Tag represents builtin and custom tags
type Tag struct {
Key string
Value string
}
|
