feat: auto-set Steam Launch Options after MelonLoader install#6
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Until now the app only showed a guide telling users to paste "setup_helper.sh" %command% into Steam's per-game Launch Options by hand. Port the targeted localconfig.vdf editor from the reference Swift installer (sbrothers7/UMMInstall) to Dart so the wrapper is wired up automatically on install and cleared on uninstall. - steam_config.dart: cross-platform (macOS/Linux/Windows) localconfig.vdf reader/editor. Does a scoped, backup-first, atomic edit of the apps -> <appid> -> LaunchOptions value rather than re-serializing, so the rest of the file is preserved. Brace/quote-aware scan handles nested blocks and escaped quotes; clear() only removes our own wrapper so a user's custom launch options are left untouched. - Game.steamLaunchOptionsValue()/isProtonOrWineInstall(): compute the correct value per game + platform (macOS absolute path, Linux native relative path, Proton/Wine WINEDLLOVERRIDES). Windows = none. - InstallerState: apply after a successful install, clear on uninstall, surface an auto-set confirmation (with a "restart Steam" hint when Steam is running) above the existing manual guide, which stays as a fallback. - Localization for ko-KR / en-US / zh-CN. - Unit tests for the VDF editor (set/insert/scope/case/escaping/clear). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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What
After a MelonLoader install, the app now writes the required Steam Launch Options automatically instead of only showing a guide and asking the user to paste
"…/setup_helper.sh" %command%by hand. It's cleared again on uninstall.Ported the targeted
localconfig.vdfeditor from the reference Swift installer (sbrothers7/UMMInstall —SteamConfig.swift) to cross-platform Dart.How
lib/src/core/steam_config.dart(new): finds everyuserdata/<id>/config/localconfig.vdfacross detected Steam roots (macOS/Linux/Windows) and does a scoped, backup-first, atomic edit ofapps → <appid> → LaunchOptions— no full re-serialize, so the rest of the file is preserved byte-for-byte. The scan is brace/quote-aware (handles nested blocks and\"-escaped values).clear()only blanks the value when it still references one of our wrappers, so a user's own custom launch options are never touched.Game.steamLaunchOptionsValue()/isProtonOrWineInstall(): compute the correct value per game + platform — macOS native (absolute script path), Linux native (./setup_helper.sh %command%), Proton/Wine (WINEDLLOVERRIDES="winhttp=n,b" %command%), Windows (none).InstallerState: applies after a successful install, clears on uninstall, and exposes flags so the UI shows an auto-set confirmation (with a "fully restart Steam" hint when Steam is running, since Steam rewriteslocalconfig.vdfon exit). The existing manual guide stays as a fallback.ko-KR/en-US/zh-CN.Safety / fallback
localconfig.vdf, write error) is logged and the manual guide remains the fallback — install never fails because of this..modlist.bakbackup is written before each edit.steamAppId(ADOFAI977950, Rhythm Doctor774181, Dancing Line4395300).Tests
test/steam_config_test.dart— 17 cases covering the pure VDF editor: replace/insert LaunchOptions, insert a missing app block,apps-scoping vs decoys, case-insensitivity, escaped-quote handling, and the clear-only-our-wrapper rule. Full suite green (flutter test, 25 passing).Note
Heads-up for maintainers: writing into
localconfig.vdfonly sticks if Steam is fully quit; the code detects a running Steam and surfaces a restart hint. Worth a manual smoke-test on each platform.🤖 Generated with Claude Code