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feat(i18n): per-session language preference and !lang command

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Phase A plumbing for #188. Adds a users.language column (migration
0022), UserRepo.GetLanguage/SetLanguage, and Session.Lang()/SetLang
accessors so future phases can resolve localized content per session
instead of falling back to the server-wide config.Language.

The preference is loaded from the DB on login and persisted via a new
!lang <en|jp|fr|es> chat command that shows the current language when
called without an argument, validates the code (case-insensitive), and
replies in the newly selected language so the switch is visible
immediately. An empty stored value falls back to config.Language.

sys_language.go exposes getLangStringsFor(code) as the new dispatch
primitive; getLangStrings(server) is now a thin wrapper so existing
callers keep working unchanged. isSupportedLang + supportedLangs keep
the !lang validator in sync with the dispatcher.

Localized quest/scenario content and per-session i18n lookups in
existing handlers are deliberately out of scope for phase A — this
commit ships only the plumbing so it can be reviewed and deployed
independently.
This commit is contained in:
Houmgaor
2026-04-06 19:52:19 +02:00
parent 803996adac
commit 5b38bfde3f
18 changed files with 341 additions and 8 deletions
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27
server/channelserver/handlers_commands.go
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@@ -144,6 +144,33 @@ func parseChatCommand(s *Session, command string) {
} else {
sendDisabledCommandMessage(s, commands["Timer"])
}
case commands["Language"].Prefix:
if commands["Language"].Enabled || s.isOp() {
// Use the session's *current* i18n table so replies come back in
// the language the player was using before the change — the
// success message reflects the new language via its argument.
i := getLangStringsFor(s.Lang())
if len(args) < 2 {
sendServerChatMessage(s, fmt.Sprintf(i.commands.lang.current, s.Lang()))
sendServerChatMessage(s, fmt.Sprintf(i.commands.lang.usage, s.server.erupeConfig.CommandPrefix+commands["Language"].Prefix))
} else {
requested := strings.ToLower(args[1])
if !isSupportedLang(requested) {
sendServerChatMessage(s, fmt.Sprintf(i.commands.lang.invalid, requested))
} else {
if err := s.server.userRepo.SetLanguage(s.userID, requested); err != nil {
s.logger.Error("Failed to persist language preference", zap.Error(err), zap.String("lang", requested))
}
s.SetLang(requested)
// Reply in the *new* language so the player immediately
// sees the server switched.
newI := getLangStringsFor(requested)
sendServerChatMessage(s, fmt.Sprintf(newI.commands.lang.success, requested))
}
}
} else {
sendDisabledCommandMessage(s, commands["Language"])
}
case commands["PSN"].Prefix:
if commands["PSN"].Enabled || s.isOp() {
if len(args) > 1 {