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// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
package notify
import (
"encoding/json"
"os"
"path/filepath"
)
// RuntimeDir is where the daemon publishes. It is tmpfs, so a reboot clears
// every file and there is no cleanup code.
func RuntimeDir() string {
if d := os.Getenv("XDG_RUNTIME_DIR"); d != "" {
return filepath.Join(d, "notifyd")
}
return filepath.Join(os.TempDir(), "notifyd")
}
// Publish writes the live queue and the history ring, each whole, through a
// temporary file and a rename. A reader never sees a half-written value, the
// same atomic write the status registry relies on.
func Publish(dir string, live, history []Popup) error {
if err := os.MkdirAll(dir, 0o700); err != nil {
return err
}
if live == nil {
live = []Popup{}
}
if history == nil {
history = []Popup{}
}
if err := writeJSON(filepath.Join(dir, "queue.json"), live); err != nil {
return err
}
return writeJSON(filepath.Join(dir, "history.json"), history)
}
func writeJSON(path string, v any) error {
data, err := json.Marshal(v)
if err != nil {
return err
}
tmp, err := os.CreateTemp(filepath.Dir(path), ".tmp-*")
if err != nil {
return err
}
tmpName := tmp.Name()
renamed := false
defer func() {
if !renamed {
os.Remove(tmpName)
}
}()
if _, err := tmp.Write(data); err != nil {
tmp.Close()
return err
}
if err := tmp.Close(); err != nil {
return err
}
if err := os.Rename(tmpName, path); err != nil {
return err
}
renamed = true
return nil
}
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