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package cal
import (
"fmt"
"sort"
"strings"
"time"
"github.com/knusbaum/go9p/fs"
"github.com/knusbaum/go9p/proto"
)
// slug makes a string safe to use as one path element.
func slug(s string) string {
s = strings.TrimSpace(s)
var b strings.Builder
for _, r := range s {
switch {
case r >= 'a' && r <= 'z', r >= 'A' && r <= 'Z', r >= '0' && r <= '9':
b.WriteRune(r)
case r == '-', r == '.', r == '_':
b.WriteRune(r)
case r == ' ':
b.WriteRune('-')
default:
b.WriteRune('_')
}
}
out := b.String()
if out == "" {
out = "unnamed"
}
if len(out) > 64 {
out = out[:64]
}
return out
}
// uniqueName returns name, or name-2, name-3 ... if it is already taken.
// Real calendars do collide: two events at the same minute with the same
// summary, or several orphaned overrides sharing one UID.
func uniqueName(parent *fs.StaticDir, name string) string {
kids := parent.Children()
if _, taken := kids[name]; !taken {
return name
}
for i := 2; ; i++ {
try := fmt.Sprintf("%s-%d", name, i)
if _, taken := kids[try]; !taken {
return try
}
}
}
func (s *Server) file(dir *fs.StaticDir, name, content string) {
st := s.fsys.NewStat(name, s.user, s.user, 0444)
dir.AddChild(fs.NewStaticFile(st, []byte(content)))
}
func (s *Server) subdir(parent *fs.StaticDir, name string) *fs.StaticDir {
if c, ok := parent.Children()[name]; ok {
if d, ok := c.(*fs.StaticDir); ok {
return d
}
}
st := s.fsys.NewStat(name, s.user, s.user, 0555|proto.DMDIR)
d := fs.NewStaticDir(st)
parent.AddChild(d)
return d
}
func tfmt(t time.Time, allDay bool) string {
if allDay {
return t.Format("2006-01-02")
}
return t.Format(time.RFC3339)
}
// buildEvents populates events/uuid/<uid>/ with one directory per event.
func (s *Server) buildEvents(root *fs.StaticDir, evs []*Event) {
d := s.subdir(s.subdir(root, "events"), "uuid")
for _, e := range evs {
name := slug(e.UID)
if !e.RecurID.IsZero() {
// an override with no series of its own to hang under
name += "-" + e.RecurID.Format("20060102T150405")
}
name = uniqueName(d, name)
if s.evdir == nil {
s.evdir = make(map[*Event]string)
}
s.evdir[e] = name
ed := s.subdir(d, name)
s.file(ed, "summary", e.Summary+"\n")
s.file(ed, "start", tfmt(e.Start, e.AllDay)+"\n")
if !e.End.IsZero() {
s.file(ed, "end", tfmt(e.End, e.AllDay)+"\n")
}
if e.Location != "" {
s.file(ed, "location", e.Location+"\n")
}
if e.Description != "" {
s.file(ed, "description", e.Description+"\n")
}
if e.RRule != "" {
s.file(ed, "rrule", e.RRule+"\n")
}
if e.Organizer != "" {
s.file(ed, "organizer", e.Organizer+"\n")
}
if len(e.Attendees) > 0 {
s.file(ed, "attendees", attendeeText(e.Attendees))
}
s.file(ed, "uid", e.UID+"\n")
s.file(ed, "raw", e.Raw)
}
}
// buildWhen populates events/date/YYYY/MM/DD/ with one file per occurrence.
func (s *Server) buildWhen(root *fs.StaticDir, insts []Instance) {
w := s.subdir(s.subdir(root, "events"), "date")
for _, in := range insts {
// File by local wall-clock time. Events arrive in a mix of
// zones -- TZID=America/New_York here, UTC there -- and if the
// path keeps each event's own zone then a day's files neither
// sort by time nor land on the right day. All-day events are
// floating and must not be shifted.
st := in.Start
if !in.Ev.AllDay {
st = st.Local()
}
y := s.subdir(w, st.Format("2006"))
m := s.subdir(y, st.Format("01"))
d := s.subdir(m, st.Format("02"))
// The first field is always four digits so that shell tools can
// compare it numerically; all-day events sort to the top of the
// day and are still marked as such.
name := st.Format("1504") + "-" + slug(in.Ev.Summary)
if in.Ev.AllDay {
name = "0000-allday-" + slug(in.Ev.Summary)
}
// An overridden occurrence belongs to its series' directory.
ev := in.Ev
if ev.master != nil {
ev = ev.master
}
fname := uniqueName(d, name)
s.file(d, fname, instText(in, s.evdir[ev]))
s.index = append(s.index, index{
// relative to the server's root: it cannot know where it
// has been mounted, and under /mnt/pim/calendars/<name>
// it would guess wrong
path: fmt.Sprintf("events/date/%s/%s", st.Format("2006/01/02"), fname),
in: in,
})
}
}
func instText(in Instance, evdir string) string {
var b strings.Builder
fmt.Fprintf(&b, "summary: %s\n", in.Ev.Summary)
fmt.Fprintf(&b, "start: %s\n", tfmt(in.Start, in.Ev.AllDay))
fmt.Fprintf(&b, "end: %s\n", tfmt(in.End, in.Ev.AllDay))
if in.Ev.Location != "" {
fmt.Fprintf(&b, "location: %s\n", in.Ev.Location)
}
// Epoch seconds as well as RFC3339: rc has no way to parse the
// latter, but date(1) formats the former.
fmt.Fprintf(&b, "epoch: %d\n", in.Start.Unix())
fmt.Fprintf(&b, "epochend: %d\n", in.End.Unix())
fmt.Fprintf(&b, "uid: %s\n", in.Ev.UID)
// 9P2000 has no symlinks, so publish the path instead. A tool must
// never have to reproduce the server's slug rules to find this.
if evdir != "" {
fmt.Fprintf(&b, "event: ../../../../uuid/%s\n", evdir)
}
if in.Ev.RRule != "" {
fmt.Fprintf(&b, "rrule: %s\n", in.Ev.RRule)
}
if in.Ev.Description != "" {
fmt.Fprintf(&b, "\n%s\n", strings.TrimRight(in.Ev.Description, "\n"))
}
return b.String()
}
// expand returns every instance in [t0,t1), sorted by start time.
func expand(evs []*Event, t0, t1 time.Time) []Instance {
var out []Instance
for _, e := range evs {
out = append(out, e.Instances(t0, t1)...)
}
sort.Slice(out, func(i, j int) bool {
if out[i].Start.Equal(out[j].Start) {
return out[i].Ev.Summary < out[j].Ev.Summary
}
return out[i].Start.Before(out[j].Start)
})
return out
}
// attendeeText is one attendee per line: status, name, address.
func attendeeText(as []Attendee) string {
var b strings.Builder
for _, a := range as {
st := a.Partstat
if st == "" {
st = "UNKNOWN"
}
name := a.Name
if name == "" {
name = a.Email
}
fmt.Fprintf(&b, "%-12s\t%s\t%s\n", st, name, a.Email)
}
return b.String()
}
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