window_state.go

package main

import (
	"encoding/json"
	"os"
	"path/filepath"
)

// windowState is the persisted window geometry (shared across platforms,
// stored as JSON in the user config dir).
type windowState struct {
	X, Y, W, H int
	Maximized  bool
}

func stateFilePath() (string, bool) {
	dir, err := os.UserConfigDir()
	if err != nil {
		return "", false
	}
	return filepath.Join(dir, "msgview", "window.json"), true
}

// readWindowState returns the saved geometry, or ok=false if there is none or
// it is malformed.
func readWindowState() (windowState, bool) {
	p, ok := stateFilePath()
	if !ok {
		return windowState{}, false
	}
	b, err := os.ReadFile(p)
	if err != nil {
		return windowState{}, false
	}
	var s windowState
	if err := json.Unmarshal(b, &s); err != nil || s.W <= 0 || s.H <= 0 {
		return windowState{}, false
	}
	return s, true
}

func writeWindowState(s windowState) {
	p, ok := stateFilePath()
	if !ok {
		return
	}
	if err := os.MkdirAll(filepath.Dir(p), 0o755); err != nil {
		return
	}
	if b, err := json.Marshal(s); err == nil {
		os.WriteFile(p, b, 0o644)
	}
}