commands.zig

1// commands.zig — all command handlers2// Orchestrates exec/api/output. Zero direct stdout writes.3const std = @import("std");4const builtin = @import("builtin");5const types = @import("types.zig");6const errors = @import("errors.zig");7const config = @import("config.zig");8const output = @import("output.zig");9const exec = @import("exec.zig");10const api = @import("api.zig");11const search_tui = @import("search.zig");12const version = @import("version.zig");1314const UPDATE_URL = "https://kepr.uk/api/nina/releases/latest";1516pub const Ctx = struct {17    gpa: std.mem.Allocator,18    io: std.Io,19    environ: *const std.process.Environ.Map,20    machine: types.Machine,21    cfg: types.NinaConfig,22    args: []const []const u8, // positional args after subcommand23    sub: []const u8, // subcommand (e.g. "list" in "service list")24    dry: bool,25    check: bool,26    no_apply: bool,27    all: bool,28    last: u32,29    json: bool,30    user: bool, // --user: operate on user (vs system) services31};3233// A system is flake-managed when the config says so OR a flake.nix is present in34// the config dir. Detection means a fresh channel user who points nina at a flake35// dir gets the right behavior without editing config first.36fn flakeSystem(ctx: Ctx) bool {37    return ctx.cfg.flake or exec.configHasFlake(ctx.gpa, ctx.io, &ctx.machine);38}3940pub fn apply(ctx: Ctx) !void {41    if (ctx.dry) {42        output.applyDry(ctx.machine.name);43        const code = try exec.nixosRebuildDryActivate(ctx.io, &ctx.machine, ctx.gpa);44        if (code != 0) return error.BuildFailed;45        output.applyDryDone();46        return;47    }48    if (ctx.check) {49        return check(ctx);50    }5152    output.applyStart(ctx.machine.name);53    const start = std.Io.Clock.awake.now(ctx.io);5455    const code = exec.nixosRebuildSwitch(ctx.io, &ctx.machine, ctx.gpa) catch |e| {56        exec.markApplyFailed(ctx.io, ctx.environ);57        output.applyFailed("");58        return e;59    };6061    if (code != 0) {62        exec.markApplyFailed(ctx.io, ctx.environ);63        output.applyFailed("");64        return error.BuildFailed;65    }6667    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());68    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));69    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;70    const after_failure = exec.takeApplyFailed(ctx.io, ctx.environ);71    output.applyDone(gen, elapsed, after_failure);72    logAction(ctx, "apply", gen);73}7475pub fn check(ctx: Ctx) !void {76    output.checkStart(ctx.machine.name);77    const code = try exec.nixosRebuildBuild(ctx.io, &ctx.machine, ctx.gpa);78    if (code != 0) {79        output.checkFailed("");80        return error.BuildFailed;81    }82    output.checkOk();83}8485pub fn back(ctx: Ctx) !void {86    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);87    defer ctx.gpa.free(gens);8889    var current: u32 = 0;90    for (gens) |g| if (g.current) {91        current = g.number;92    };9394    // Newest generation older than current. If there is none, we're already at the95    // oldest — stop cleanly instead of letting rollback fail with 'build failed'.96    var prev: u32 = 0;97    var has_prev = false;98    for (gens) |g| {99        if (g.number < current and (!has_prev or g.number > prev)) {100            prev = g.number;101            has_prev = true;102        }103    }104    if (!has_prev) {105        output.alreadyOldest();106        return;107    }108109    output.backStart(ctx.machine.name, current, prev);110    if (ctx.cfg.confirm and !output.confirm("")) return;111112    const code = try exec.rollback(ctx.io, &ctx.machine, ctx.gpa);113    if (code != 0) return error.BuildFailed;114    output.backDone(prev);115}116117pub fn go(ctx: Ctx) !void {118    if (ctx.args.len == 0) return error.Internal;119    const target = std.fmt.parseInt(u32, ctx.args[0], 10) catch return error.Internal;120    const current = try exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine);121122    output.goStart(ctx.machine.name, current, target);123    if (ctx.cfg.confirm and !output.confirm("")) return;124125    const code = try exec.switchGeneration(ctx.io, &ctx.machine, ctx.gpa, target);126    if (code != 0) return error.ProcessFailed;127    output.generationDone(target);128}129130pub fn history(ctx: Ctx) !void {131    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);132    defer ctx.gpa.free(gens);133    output.historyHeader(ctx.machine.name);134    for (gens) |g| output.historyRow(g);135}136137const gen_help = [_][2][]const u8{138    .{ "list", "list generations" },139    .{ "current", "show current generation" },140    .{ "delete <n>", "delete generation n" },141    .{ "delete old", "delete old generations" },142};143144pub fn genCmd(ctx: Ctx) !void {145    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("gen", &gen_help, null);146    if (std.mem.eql(u8, ctx.sub, "list")) return history(ctx);147    if (std.mem.eql(u8, ctx.sub, "current")) {148        const n = try exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine);149        output.genCurrent(n);150        return;151    }152    if (std.mem.eql(u8, ctx.sub, "delete")) {153        if (ctx.args.len == 0) return error.Internal;154        if (std.mem.eql(u8, ctx.args[0], "old")) {155            if (ctx.cfg.confirm and !output.confirm("")) return;156            _ = try exec.deleteOldGenerations(ctx.io, &ctx.machine, ctx.gpa);157        } else {158            const n = std.fmt.parseInt(u32, ctx.args[0], 10) catch return error.Internal;159            if (ctx.cfg.confirm and !output.confirm("")) return;160            _ = try exec.deleteGeneration(ctx.io, &ctx.machine, ctx.gpa, n);161        }162        output.done();163        return;164    }165    return error.Internal;166}167168pub fn clean(ctx: Ctx) !void {169    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);170    defer ctx.gpa.free(gens);171    const all = ctx.all or std.mem.eql(u8, ctx.sub, "all");172    const total: u32 = @intCast(gens.len);173    // `clean all` keeps only the current generation; otherwise keep the configured174    // count. With nothing older than the keep limit, there's nothing to collect.175    const keep: u32 = if (all) 1 else ctx.cfg.generations;176    if (total <= keep) {177        output.cleanNothing(ctx.machine.name, total);178        return;179    }180    output.cleanStart(ctx.machine.name, keep, total);181    if (ctx.cfg.confirm and !output.confirm("removing — cannot be undone")) return;182    _ = try exec.collectGarbage(ctx.io, &ctx.machine, ctx.gpa, all, ctx.cfg.generations);183    output.cleanDone();184}185186pub fn statusCmd(ctx: Ctx) !void {187    output.statusHeader();188    // --all renders every configured machine; remotes route through the same SSH189    // path as exec.capture. An unreachable machine is shown in red, not fatal.190    if (ctx.all and ctx.cfg.machines.len > 0) {191        for (ctx.cfg.machines) |m| statusRowFor(ctx, &m);192    } else {193        statusRowFor(ctx, &ctx.machine);194    }195    homeStatusLine(ctx);196}197198// When standalone Home Manager is present, show its current generation as a dim199// line indented under the machine rows. Gated on standalone mode (the only mode200// where we can read a generation), so a machine without HM is unaffected.201fn homeStatusLine(ctx: Ctx) void {202    if (exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ) != .standalone) return;203    const out = exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine) catch return;204    defer ctx.gpa.free(out);205    const gens = parseHomeGenerations(ctx.gpa, out) catch return;206    defer freeHomeGens(ctx.gpa, gens);207    if (gens.len == 0) return;208    output.statusHomeRow(gens[0].number, gens[0].date);209}210211fn statusRowFor(ctx: Ctx, machine: *const types.Machine) void {212    // A failure to read the current generation means we couldn't reach or query213    // the machine — mark it unreachable rather than reporting a bogus gen 0.214    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, machine) catch {215        output.statusRow(machine.name, 0, "", "", false);216        return;217    };218    const st = exec.systemStatus(ctx.gpa, ctx.io, machine);219    defer ctx.gpa.free(st.size);220    defer ctx.gpa.free(st.age);221    output.statusRow(machine.name, gen, st.age, st.size, true);222}223224pub fn diff(ctx: Ctx) !void {225    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);226    defer ctx.gpa.free(gens);227    var current: u32 = 0;228    var prev: u32 = 0;229    for (gens) |g| {230        if (g.current) current = g.number;231        if (!g.current and g.number > prev and g.number < current) prev = g.number;232    }233    if (ctx.args.len >= 2) {234        const a = std.fmt.parseInt(u32, ctx.args[0], 10) catch current - 1;235        const b = std.fmt.parseInt(u32, ctx.args[1], 10) catch current;236        output.diffHeader(a, b, ctx.machine.name);237        if (try exec.diffClosures(ctx.io, &ctx.machine, ctx.gpa, a, b) != 0) return error.ProcessFailed;238    } else {239        output.diffHeader(if (prev > 0) prev else current - 1, current, ctx.machine.name);240        if (try exec.diffClosures(ctx.io, &ctx.machine, ctx.gpa, if (prev > 0) prev else current - 1, current) != 0) return error.ProcessFailed;241    }242}243244pub fn mood(ctx: Ctx) !void {245    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;246    const st = exec.systemStatus(ctx.gpa, ctx.io, &ctx.machine);247    defer ctx.gpa.free(st.size);248    defer ctx.gpa.free(st.age);249    const state = exec.systemRunningState(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");250    defer ctx.gpa.free(state);251    output.mood(ctx.machine.name, state, gen, st.age, st.size);252}253254pub fn doctor(ctx: Ctx) !void {255    output.doctorHeader(ctx.machine.name);256    const checks = try exec.runDoctorChecks(ctx.gpa, ctx.io, &ctx.machine);257    defer ctx.gpa.free(checks);258    var warnings: u32 = 0;259    var failures: u32 = 0;260    for (checks) |ch| {261        output.doctorRow(ch);262        if (ch.status == .warn) warnings += 1;263        if (ch.status == .fail) failures += 1;264    }265266    // Home Manager row only when present — absent on a machine without HM, so267    // doctor's table is unchanged there.268    const hm_mode = exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ);269    if (hm_mode != .none) {270        const note = homeDoctorNote(ctx, hm_mode);271        defer ctx.gpa.free(note);272        output.doctorRow(.{ .name = "home manager", .status = .ok, .note = note });273    }274275    output.doctorSummary(warnings, failures);276}277278// "standalone  gen 765" / "module" — the note shown in doctor's home manager row.279// Caller owns the returned slice.280fn homeDoctorNote(ctx: Ctx, mode: exec.HomeManagerMode) []const u8 {281    const label = switch (mode) {282        .standalone => "standalone",283        .module => "module",284        .none => "",285    };286    if (mode == .standalone) {287        const gen = homeCurrentGen(ctx);288        if (gen != 0)289            return std.fmt.allocPrint(ctx.gpa, "{s}  gen {d}", .{ label, gen }) catch290                (ctx.gpa.dupe(u8, label) catch "");291    }292    return ctx.gpa.dupe(u8, label) catch "";293}294295// nina update — kepr self-update for the nina binary itself.296pub fn update(ctx: Ctx) !void {297    output.updateSelfStart();298299    if (comptime std.mem.eql(u8, version.PLATFORM, "unsupported")) {300        output.updateSelfNoPlatform(@tagName(builtin.cpu.arch) ++ "-" ++ @tagName(builtin.os.tag));301        return error.Internal;302    }303304    const env_url = ctx.environ.get("NINA_UPDATE_SOURCE");305    const source_url = env_url orelse UPDATE_URL;306307    const body = exec.fetchUrl(ctx.gpa, ctx.io, source_url) catch |e| switch (e) {308        error.NetworkError, error.HttpError => {309            output.updateSelfNetworkError();310            return;311        },312        else => return e,313    };314    defer ctx.gpa.free(body);315316    const parsed = std.json.parseFromSlice(std.json.Value, ctx.gpa, body, .{}) catch {317        output.printWarning("could not parse release metadata");318        return;319    };320    defer parsed.deinit();321322    const root = parsed.value;323    if (root != .object) {324        output.printWarning("malformed release metadata");325        return;326    }327328    const remote_ver = blk: {329        const v = root.object.get("version") orelse {330            output.printWarning("malformed release metadata");331            return;332        };333        break :blk switch (v) {334            .string => |s| s,335            else => {336                output.printWarning("malformed release metadata");337                return;338            },339        };340    };341    const release_notes = blk: {342        const v = root.object.get("release_notes") orelse break :blk "";343        break :blk switch (v) {344            .string => |s| s,345            else => "",346        };347    };348349    if (std.mem.eql(u8, remote_ver, version.VERSION)) {350        output.updateSelfCurrent(version.VERSION);351        return;352    }353354    output.updateSelfAvailable(version.VERSION, remote_ver);355    output.updateSelfReleaseNotes(release_notes);356    if (ctx.check) return;357358    var exe_buf: [std.Io.Dir.max_path_bytes]u8 = undefined;359    const install_path = exec.selfExePath(ctx.io, &exe_buf) catch {360        errors.error_info.setMessage("could not determine install path", .{});361        return error.Internal;362    };363364    // When running from the nix store, defer to nix profile upgrade so nix365    // manages the transition (the store is read-only; binary replacement fails).366    // A NixOS system install also resolves into the store but isn't a profile367    // element, so check the profile to avoid a no-op `upgrade` — it updates with368    // the next nixos-rebuild instead.369    if (std.mem.startsWith(u8, install_path, "/nix/store/")) {370        const nina_element = exec.profileNinaElement(ctx.gpa, ctx.io, &ctx.machine);371        defer {372            if (nina_element) |n| ctx.gpa.free(n);373        }374        if (nina_element == null) {375            output.updateSelfNotInProfile();376            return;377        }378        const element = nina_element.?;379        output.updateSelfNixManaged(remote_ver);380        if (ctx.cfg.confirm and !output.confirm("")) return;381        const ec = exec.streamLocal(ctx.io, &.{ "nix", "profile", "upgrade", element }) catch {382            output.updateSelfNixFailed();383            return;384        };385        if (ec != 0) output.updateSelfNixFailed();386        return;387    }388389    const plat_info = blk: {390        const pv = root.object.get("platforms") orelse break :blk null;391        if (pv != .object) break :blk null;392        break :blk pv.object.get(version.PLATFORM);393    };394    if (plat_info == null) {395        output.updateSelfNoPlatform(version.PLATFORM);396        return;397    }398399    const dl_url = blk: {400        const v = plat_info.?.object.get("url") orelse {401            output.printWarning("malformed release metadata");402            return;403        };404        break :blk switch (v) {405            .string => |s| s,406            else => {407                output.printWarning("malformed release metadata");408                return;409            },410        };411    };412413    const raw_cksum = blk: {414        if (plat_info.?.object.get("blake3")) |v|415            break :blk switch (v) {416                .string => |s| s,417                else => {418                    output.printWarning("malformed release metadata");419                    return;420                },421            };422        if (plat_info.?.object.get("checksum")) |v|423            break :blk switch (v) {424                .string => |s| s,425                else => {426                    output.printWarning("malformed release metadata");427                    return;428                },429            };430        output.printWarning("missing checksum in release metadata");431        return;432    };433    const expected_hex = if (std.mem.startsWith(u8, raw_cksum, "blake3:")) raw_cksum["blake3:".len..] else raw_cksum;434435    if (ctx.cfg.confirm and !output.confirm("")) return;436437    output.updateSelfDownloading(remote_ver, version.PLATFORM);438    const tmp_path = exec.downloadToTemp(ctx.gpa, ctx.io, dl_url) catch {439        output.printWarning("download failed — check your connection and try again");440        return;441    };442    defer ctx.gpa.free(tmp_path);443444    output.updateSelfVerifying();445    exec.verifyAndInstall(ctx.gpa, ctx.io, tmp_path, expected_hex, install_path) catch |e| switch (e) {446        error.ChecksumMismatch => {447            output.updateSelfChecksumFailed();448            return;449        },450        else => return e,451    };452453    output.updateSelfDone(version.VERSION, remote_ver);454}455456// nina goodbye — clean uninstall. Three install paths:457// - nix profile (binary in nix store with a profile element) → nix profile remove458// - koh build or source build (plain binary on PATH) → delete the file459pub fn goodbye(ctx: Ctx) !void {460    output.goodbyeStart();461462    var exe_buf: [std.Io.Dir.max_path_bytes]u8 = undefined;463    const install_path = exec.selfExePath(ctx.io, &exe_buf) catch {464        errors.error_info.setMessage("could not determine install path", .{});465        return error.Internal;466    };467468    // A binary outside the nix store is a koh build or source build — delete it.469    if (!std.mem.startsWith(u8, install_path, "/nix/store/")) {470        output.goodbyeFile(install_path);471        if (ctx.cfg.confirm and !output.confirm("")) return;472        std.Io.Dir.deleteFileAbsolute(ctx.io, install_path) catch |e| {473            errors.error_info.setMessage("could not remove {s}", .{install_path});474            return e;475        };476        output.goodbyeDone();477        return;478    }479480    // Binary is in the nix store — find and remove the profile element.481    const nina_element = exec.profileNinaElement(ctx.gpa, ctx.io, &ctx.machine);482    defer {483        if (nina_element) |n| ctx.gpa.free(n);484    }485486    if (nina_element == null) {487        errors.error_info.setMessage("nina not found in nix profile — was it installed via 'nix profile add'?", .{});488        return error.Internal;489    }490491    output.goodbyeNix();492    if (ctx.cfg.confirm and !output.confirm("")) return;493    const ec = exec.streamLocal(ctx.io, &.{ "nix", "profile", "remove", nina_element.? }) catch {494        output.goodbyeFailed("nix profile remove failed");495        return;496    };497    if (ec != 0) {498        output.goodbyeFailed("nix profile remove failed");499        return;500    }501    output.goodbyeDone();502}503504fn channelUpdateCmd(ctx: Ctx) !void {505    output.updateStart(ctx.machine.name);506    _ = try exec.channelUpdate(ctx.io, &ctx.machine, ctx.gpa);507    output.updateDone();508}509510pub fn upgrade(ctx: Ctx) !void {511    output.upgradeStart(ctx.machine.name);512    // Flake systems update inputs (flake.lock); channel systems update channels.513    // Running nix-channel --update on a flake system is a no-op at best. The514    // rebuild below is already flake-aware via exec.nixosRebuildSwitch.515    if (flakeSystem(ctx)) {516        output.printSubstep("updating flake inputs", .{});517        _ = exec.flakeUpdateAt(ctx.io, &ctx.machine, ctx.gpa, ctx.machine.config_path) catch {};518    } else {519        output.printSubstep("updating channels", .{});520        _ = exec.channelUpdate(ctx.io, &ctx.machine, ctx.gpa) catch {};521    }522    output.printSubstep("rebuilding", .{});523    const start = std.Io.Clock.awake.now(ctx.io);524    const code = try exec.nixosRebuildSwitch(ctx.io, &ctx.machine, ctx.gpa);525    if (code != 0) {526        output.applyFailed("");527        return error.BuildFailed;528    }529    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());530    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));531    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;532    output.applyDone(gen, elapsed, false);533}534535pub fn log(ctx: Ctx) !void {536    output.logHeader(ctx.machine.name);537    const content = exec.readNinaLog(ctx.gpa, ctx.io, ctx.environ, ctx.last) catch {538        // No log yet — that's fine539        return;540    };541    defer ctx.gpa.free(content);542    var lines = std.mem.splitScalar(u8, content, '\n');543    while (lines.next()) |line| {544        const t = std.mem.trim(u8, line, " \t\r");545        if (t.len == 0) continue;546        if (t[0] == '{') {547            renderJsonLogLine(ctx.gpa, t);548        } else {549            // legacy tab-separated format550            var parts = std.mem.tokenizeScalar(u8, t, '\t');551            const date = parts.next() orelse continue;552            const time = parts.next() orelse "";553            const action = parts.next() orelse "";554            const detail = parts.next() orelse "";555            output.logRow(date, time, action, detail);556        }557    }558}559560// The on-disk log is JSON Lines: {"ts","machine","command","outcome","gen_after",...}.561// Render ts -> date/time columns, command -> action, outcome(+gen) -> detail.562fn renderJsonLogLine(gpa: std.mem.Allocator, line: []const u8) void {563    const parsed = std.json.parseFromSlice(std.json.Value, gpa, line, .{}) catch {564        output.logRow(line, "", "", ""); // unparseable — show raw rather than drop565        return;566    };567    defer parsed.deinit();568    if (parsed.value != .object) return;569    const o = parsed.value.object;570571    const ts = jsonStr(o, "ts");572    const date = if (ts.len >= 10) ts[0..10] else ts;573    const time = if (ts.len >= 16) ts[11..16] else "";574    const action = jsonStr(o, "command");575    const outcome = jsonStr(o, "outcome");576577    var buf: [160]u8 = undefined;578    var detail: []const u8 = outcome;579    if (o.get("gen_after")) |g| {580        if (g == .integer) {581            detail = std.fmt.bufPrint(&buf, "{s}   -> gen {d}", .{ outcome, g.integer }) catch outcome;582        }583    }584    output.logRow(date, time, action, detail);585}586587fn jsonStr(o: std.json.ObjectMap, key: []const u8) []const u8 {588    if (o.get(key)) |v| {589        if (v == .string) return v.string;590    }591    return "";592}593594pub fn edit(ctx: Ctx) !void {595    const hardware = ctx.args.len > 0 and std.mem.eql(u8, ctx.args[0], "hardware");596    const filename = if (hardware) "hardware-configuration.nix" else "configuration.nix";597    const path = try std.fmt.allocPrint(ctx.gpa, "{s}/{s}", .{ ctx.machine.config_path, filename });598    defer ctx.gpa.free(path);599    output.editOpen(path, ctx.cfg.editor);600    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, path, null);601}602603pub fn fmt(ctx: Ctx) !void {604    const path = try std.fmt.allocPrint(ctx.gpa, "{s}/configuration.nix", .{ctx.machine.config_path});605    defer ctx.gpa.free(path);606    if (ctx.check) {607        const code = try exec.nixpkgsFmt(ctx.io, &ctx.machine, ctx.gpa, path, true);608        if (code != 0) output.fmtNeedsFormat() else output.fmtDone();609        return;610    }611    output.fmtStart(path);612    _ = try exec.nixpkgsFmt(ctx.io, &ctx.machine, ctx.gpa, path, false);613    output.fmtDone();614}615616pub fn repl(ctx: Ctx) !void {617    output.replStart();618    _ = try exec.nixRepl(ctx.io, &ctx.machine, ctx.gpa);619}620621pub fn develop(ctx: Ctx) !void {622    if (std.mem.eql(u8, ctx.sub, "show")) {623        _ = try exec.nixBuild(ctx.io, &ctx.machine, ctx.gpa, null);624        return;625    }626    const run_cmd: ?[]const u8 = if (ctx.args.len > 0 and std.mem.eql(u8, ctx.sub, "run"))627        ctx.args[0]628    else629        null;630    output.developStart(&.{});631    _ = try exec.nixDevelopPs1(ctx.io, &ctx.machine, ctx.gpa, run_cmd, ctx.environ);632    output.developDone();633}634635pub fn info(ctx: Ctx) !void {636    output.infoHeader(ctx.machine.name);637    const nixos_ver = exec.systemInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");638    defer ctx.gpa.free(nixos_ver);639    output.infoRow("nixos", std.mem.trim(u8, nixos_ver, " \t\n\r"));640641    const kernel = exec.kernelInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");642    defer ctx.gpa.free(kernel);643    output.infoRow("kernel", std.mem.trim(u8, kernel, " \t\n\r"));644645    const uptime = exec.uptimeInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");646    defer ctx.gpa.free(uptime);647    output.infoRow("uptime", std.mem.trim(u8, uptime, " \t\n\r"));648}649650pub fn boot(ctx: Ctx) !void {651    output.bootHeader(ctx.machine.name);652    const entries = exec.bootEntries(ctx.gpa, ctx.io, &ctx.machine) catch &.{};653    defer ctx.gpa.free(entries);654    for (entries, 0..) |entry, i| output.bootEntry(entry, i);655}656657pub fn searchCmd(ctx: Ctx) !void {658    const query = if (ctx.args.len > 0) ctx.args[0] else "";659    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);660    const selected = try search_tui.run(ctx.gpa, ctx.io, query, .packages);661    if (selected) |npkg| try selectAndInstall(ctx, npkg);662}663664pub fn optionCmd(ctx: Ctx) !void {665    const query = if (ctx.args.len > 0) ctx.args[0] else "";666    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);667    _ = try search_tui.run(ctx.gpa, ctx.io, query, .options);668}669670pub fn install(ctx: Ctx) !void {671    const pkg_name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;672673    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);674675    // Search for the package to get the attr676    const pkgs = api.searchPackages(ctx.gpa, ctx.io, pkg_name) catch {677        errors.error_info.setMessage("'{s}' not found in nixpkgs", .{pkg_name});678        errors.error_info.setSuggestion("nina search {s}", .{pkg_name});679        return error.PackageNotFound;680    };681682    if (pkgs.len == 0) {683        // No matches — likely a typo. Suggest the closest real package and offer it.684        if (closestPackage(ctx, pkg_name)) |sugg| {685            output.didYouMean(pkg_name, sugg.pname);686            if (output.confirm("")) try selectAndInstall(ctx, sugg);687            return;688        }689        errors.error_info.setMessage("'{s}' not found in nixpkgs", .{pkg_name});690        errors.error_info.setSuggestion("nina search {s}", .{pkg_name});691        return error.PackageNotFound;692    }693694    // Prefer an exact name match over the first search result — `install ripgrep`695    // must pick "ripgrep", not the alphabetically-first match like "repgrep".696    var found = pkgs[0];697    for (pkgs) |p| {698        if (std.mem.eql(u8, p.pname, pkg_name)) {699            found = p;700            break;701        }702    }703    try selectAndInstall(ctx, found);704}705706// Find the real package whose name is closest to a not-found query (typo help).707// Typos usually keep the leading characters, so gather candidates with a prefix708// search and rank by edit distance; return the best only if it's typo-close.709fn closestPackage(ctx: Ctx, query: []const u8) ?types.NixPackage {710    if (query.len < 2) return null;711    var candidates = api.searchPackages(ctx.gpa, ctx.io, query[0..@min(query.len, 4)]) catch &.{};712    if (candidates.len == 0 and query.len > 2) {713        candidates = api.searchPackages(ctx.gpa, ctx.io, query[0..2]) catch &.{};714    }715    if (candidates.len == 0) return null;716717    var best: ?types.NixPackage = null;718    var best_dist: usize = std.math.maxInt(usize);719    for (candidates) |p| {720        const d = editDistance(query, p.pname);721        if (d > 0 and d < best_dist) {722            best_dist = d;723            best = p;724        }725    }726    // Only suggest a genuinely close name, scaled to query length.727    const threshold = @max(@as(usize, 2), query.len / 3);728    return if (best_dist <= threshold) best else null;729}730731// Case-insensitive Levenshtein distance. Names longer than the row buffer are732// treated as far away (never suggested).733fn editDistance(a: []const u8, b: []const u8) usize {734    const n = b.len;735    if (a.len == 0) return n;736    if (n == 0) return a.len;737    if (n + 1 > 128) return std.math.maxInt(usize);738    var prev: [128]usize = undefined;739    var curr: [128]usize = undefined;740    var j: usize = 0;741    while (j <= n) : (j += 1) prev[j] = j;742    var i: usize = 1;743    while (i <= a.len) : (i += 1) {744        curr[0] = i;745        j = 1;746        while (j <= n) : (j += 1) {747            const cost: usize = if (std.ascii.toLower(a[i - 1]) == std.ascii.toLower(b[j - 1])) 0 else 1;748            curr[j] = @min(prev[j] + 1, @min(curr[j - 1] + 1, prev[j - 1] + cost));749        }750        @memcpy(prev[0 .. n + 1], curr[0 .. n + 1]);751    }752    return prev[n];753}754755test "editDistance is case-insensitive Levenshtein" {756    try std.testing.expectEqual(@as(usize, 1), editDistance("firefux", "firefox"));757    try std.testing.expectEqual(@as(usize, 0), editDistance("git", "GIT"));758    try std.testing.expectEqual(@as(usize, 2), editDistance("fierfox", "firefox"));759    try std.testing.expectEqual(@as(usize, 7), editDistance("", "firefox"));760}761762// Prompt for the install method (profile / system / try) and dispatch. Shared by763// `nina install <pkg>` and the search widget's Enter-to-select — the letter keys764// are read here, after the search widget's raw mode is gone, so they don't765// collide with typing a query.766fn selectAndInstall(ctx: Ctx, npkg: types.NixPackage) !void {767    output.installSelectPrompt(npkg.pname, npkg.version);768769    var choice_buf: [8]u8 = undefined;770    var choice_len: usize = 0;771    while (choice_len < choice_buf.len) {772        const n = std.posix.read(std.posix.STDIN_FILENO, choice_buf[choice_len .. choice_len + 1]) catch break;773        if (n == 0) break;774        if (choice_buf[choice_len] == '\n') break;775        choice_len += 1;776    }777    const choice = std.mem.trim(u8, choice_buf[0..choice_len], " \t");778779    if (choice.len == 0 or choice[0] == 'i' or choice[0] == 'I') {780        try profileInstallPkg(ctx, npkg);781    } else if (choice[0] == 's' or choice[0] == 'S') {782        try systemInstallPkg(ctx, npkg);783    } else if (choice[0] == 't' or choice[0] == 'T') {784        try tryPkg(ctx, npkg);785    }786}787788fn profileInstallPkg(ctx: Ctx, npkg: types.NixPackage) !void {789    output.installStart(npkg.pname, .profile);790    output.printSubstep("nix profile add nixpkgs#{s}", .{npkg.attr});791    output.printTeach(try std.fmt.allocPrint(ctx.gpa, "nix profile add nixpkgs#{s}", .{npkg.attr}));792    const code = try exec.profileInstall(ctx.io, &ctx.machine, ctx.gpa, npkg.attr);793    if (code != 0) return error.ProcessFailed;794    output.installDone(npkg.pname);795}796797fn systemInstallPkg(ctx: Ctx, npkg: types.NixPackage) !void {798    const config_path = try std.fmt.allocPrint(ctx.gpa, "{s}/configuration.nix", .{ctx.machine.config_path});799    defer ctx.gpa.free(config_path);800    const line = api.findSystemPackagesLine(ctx.io, config_path) orelse 1;801    output.installEditorPrompt(npkg.pname, config_path, line, ctx.cfg.editor);802    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, config_path, line);803    if (ctx.cfg.confirm) {804        if (output.confirm("apply now? ")) {805            try apply(ctx);806        }807    }808}809810fn tryPkg(ctx: Ctx, npkg: types.NixPackage) !void {811    output.tryStart(npkg.pname);812    output.printSubstep("nix shell nixpkgs#{s}", .{npkg.attr});813    output.tryExitHint();814    _ = try exec.nixShellPs1(ctx.io, &ctx.machine, ctx.gpa, npkg.attr, ctx.environ);815    output.tryDone();816}817818pub fn remove(ctx: Ctx) !void {819    const pkg_name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;820    output.removeStart(pkg_name);821    const code = try exec.profileRemove(ctx.io, &ctx.machine, ctx.gpa, pkg_name);822    if (code != 0) return error.ProcessFailed;823    output.done();824}825826pub fn list(ctx: Ctx) !void {827    output.listHeader(ctx.machine.name);828829    // Profile packages: parse `nix profile list --json` into clean name+version830    // rows instead of dumping nix's verbose multi-line "Name:/Flake attribute:"831    // blocks.832    if (exec.profileListJson(ctx.gpa, ctx.io, &ctx.machine) catch null) |json| {833        defer ctx.gpa.free(json);834        output.listSection("profile");835        renderProfileJson(ctx.gpa, json);836    }837838    // System packages: the references of /run/current-system/sw, each a839    // <hash>-<name>-<version> store path.840    if (exec.systemPackagePaths(ctx.gpa, ctx.io, &ctx.machine) catch null) |paths| {841        defer ctx.gpa.free(paths);842        output.blankLine();843        output.listSection("system");844        var lines = std.mem.splitScalar(u8, paths, '\n');845        while (lines.next()) |line| {846            const t = std.mem.trim(u8, line, " \t\r");847            if (t.len == 0) continue;848            const row = pkgFromStorePath(t);849            // Skip support paths with no parseable version (man pages, wrappers).850            if (row.version.len == 0) continue;851            output.listPkg(row.name, row.version);852        }853    }854}855856const PkgRow = struct { name: []const u8, version: []const u8 };857858// Split a nix store path basename (<hash>-<name>-<version>) into name + version.859// Version begins at the first '-' followed by a digit, which reliably lands on860// the name/version boundary since the 32-char hash and package names start with861// non-digits.862fn pkgFromStorePath(path: []const u8) PkgRow {863    const base = std.fs.path.basename(path);864    const after_hash = if (base.len > 33 and base[32] == '-') base[33..] else base;865    var i: usize = 0;866    while (i + 1 < after_hash.len) : (i += 1) {867        if (after_hash[i] == '-' and std.ascii.isDigit(after_hash[i + 1])) {868            return .{ .name = after_hash[0..i], .version = stripOutputSuffix(after_hash[i + 1 ..]) };869        }870    }871    return .{ .name = after_hash, .version = "" };872}873874// Multi-output derivations append the output name to the store path (e.g.875// curl-8.20.0-bin, less-692-man). Strip that suffix so the version column reads876// as just the version.877fn stripOutputSuffix(ver: []const u8) []const u8 {878    const suffixes = [_][]const u8{ "-bin", "-man", "-dev", "-doc", "-lib", "-info", "-out", "-static", "-devdoc" };879    for (suffixes) |s| {880        if (std.mem.endsWith(u8, ver, s)) return ver[0 .. ver.len - s.len];881    }882    return ver;883}884885test "pkgFromStorePath splits name and version at first dash-digit" {886    const a = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-ripgrep-15.1.0");887    try std.testing.expectEqualStrings("ripgrep", a.name);888    try std.testing.expectEqualStrings("15.1.0", a.version);889890    const b = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-helix-25.01");891    try std.testing.expectEqualStrings("helix", b.name);892    try std.testing.expectEqualStrings("25.01", b.version);893894    // multi-output store paths drop their output-name suffix895    const c = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-curl-8.20.0-bin");896    try std.testing.expectEqualStrings("curl", c.name);897    try std.testing.expectEqualStrings("8.20.0", c.version);898}899900fn firstStorePath(el: std.json.Value) ?[]const u8 {901    if (el != .object) return null;902    const sp = el.object.get("storePaths") orelse return null;903    if (sp != .array or sp.array.items.len == 0) return null;904    const first = sp.array.items[0];905    return if (first == .string) first.string else null;906}907908// `nix profile list --json` has two shapes across nix versions: newer keys each909// element by name (object), older lists them positionally (array). Handle both.910fn renderProfileJson(gpa: std.mem.Allocator, json: []const u8) void {911    const parsed = std.json.parseFromSlice(std.json.Value, gpa, json, .{}) catch return;912    defer parsed.deinit();913    if (parsed.value != .object) return;914    const elements = parsed.value.object.get("elements") orelse return;915    switch (elements) {916        .object => |obj| {917            var it = obj.iterator();918            while (it.next()) |entry| {919                const ver = if (firstStorePath(entry.value_ptr.*)) |p| pkgFromStorePath(p).version else "";920                output.listPkg(entry.key_ptr.*, ver);921            }922        },923        .array => |arr| {924            for (arr.items) |el| {925                const path = firstStorePath(el) orelse continue;926                const row = pkgFromStorePath(path);927                output.listPkg(row.name, row.version);928            }929        },930        else => {},931    }932}933934pub fn tryCmd(ctx: Ctx) !void {935    const pkg_name_arg = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;936    const shell_pkg = types.NixPackage{ .attr = pkg_name_arg, .pname = pkg_name_arg, .version = "", .description = "" };937    try tryPkg(ctx, shell_pkg);938}939940// --- Home Manager commands ---941942const home_help = [_][2][]const u8{943    .{ "apply", "apply home manager configuration" },944    .{ "apply --dry", "preview changes" },945    .{ "back", "roll back one generation" },946    .{ "history", "list all generations" },947    .{ "edit", "open home.nix" },948    .{ "check", "validate without applying" },949    .{ "diff", "changes between generations" },950    .{ "packages", "list managed packages" },951};952953const HomeGen = struct {954    number: u32,955    date: []const u8,956    time: []const u8,957    path: []const u8,958};959960// `home-manager generations` lines read:961//   2026-06-01 11:56 : id 765 -> /nix/store/<hash>-home-manager-generation962// Newest first, so index 0 is the current generation.963fn parseHomeGenerations(gpa: std.mem.Allocator, out_str: []const u8) ![]HomeGen {964    var gens: std.ArrayList(HomeGen) = .empty;965    var lines = std.mem.splitScalar(u8, out_str, '\n');966    while (lines.next()) |line| {967        const t = std.mem.trim(u8, line, " \t\r");968        if (t.len == 0) continue;969        var it = std.mem.tokenizeAny(u8, t, " \t");970        const date = it.next() orelse continue;971        const time = it.next() orelse continue;972        var number: ?u32 = null;973        var path: []const u8 = "";974        while (it.next()) |tok| {975            if (std.mem.eql(u8, tok, "id")) {976                if (it.next()) |n| number = std.fmt.parseInt(u32, n, 10) catch null;977            } else if (std.mem.startsWith(u8, tok, "/nix/store/")) {978                path = tok;979            }980        }981        const num = number orelse continue;982        try gens.append(gpa, .{983            .number = num,984            .date = try gpa.dupe(u8, date),985            .time = try gpa.dupe(u8, time),986            .path = try gpa.dupe(u8, path),987        });988    }989    return gens.toOwnedSlice(gpa);990}991992fn freeHomeGens(gpa: std.mem.Allocator, gens: []HomeGen) void {993    for (gens) |g| {994        gpa.free(g.date);995        gpa.free(g.time);996        gpa.free(g.path);997    }998    gpa.free(gens);999}10001001test "parseHomeGenerations reads id, date and store path" {1002    const a = std.testing.allocator;1003    const sample =1004        \\2026-06-01 11:56 : id 765 -> /nix/store/aaaa-home-manager-generation1005        \\2026-05-31 10:29 : id 764 -> /nix/store/bbbb-home-manager-generation1006    ;1007    const gens = try parseHomeGenerations(a, sample);1008    defer freeHomeGens(a, gens);1009    try std.testing.expectEqual(@as(usize, 2), gens.len);1010    try std.testing.expectEqual(@as(u32, 765), gens[0].number);1011    try std.testing.expectEqualStrings("2026-06-01", gens[0].date);1012    try std.testing.expectEqualStrings("11:56", gens[0].time);1013    try std.testing.expectEqualStrings("/nix/store/aaaa-home-manager-generation", gens[0].path);1014    try std.testing.expectEqual(@as(u32, 764), gens[1].number);1015}10161017// Current (newest) home generation number, or 0 if unavailable.1018fn homeCurrentGen(ctx: Ctx) u32 {1019    const out = exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine) catch return 0;1020    defer ctx.gpa.free(out);1021    const gens = parseHomeGenerations(ctx.gpa, out) catch return 0;1022    defer freeHomeGens(ctx.gpa, gens);1023    return if (gens.len > 0) gens[0].number else 0;1024}10251026pub fn home(ctx: Ctx) !void {1027    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help"))1028        return output.subcommandHelp("home", &home_help, null);10291030    // Home Manager manages the local user's environment. Detection (which binary,1031    // ~/.config/home-manager, $HOME/$USER for the flake ref) all read the LOCAL1032    // host, while exec routes over SSH for a remote machine — so `home --on1033    // <remote>` would decide mode/flake-ref from the wrong box. Refuse it cleanly1034    // rather than acting on a mismatch.1035    if (!ctx.machine.local) {1036        output.homeLocalOnly(ctx.machine.name);1037        return;1038    }10391040    const mode = exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ);1041    if (mode == .none) {1042        output.homeNotInstalled();1043        return;1044    }10451046    // apply is the only command meaningful in module mode (it redirects to1047    // `nina apply`); everything else needs the standalone home-manager CLI.1048    if (std.mem.eql(u8, ctx.sub, "apply")) return homeApply(ctx, mode);1049    // edit just opens the local home.nix — fine in module mode too.1050    if (std.mem.eql(u8, ctx.sub, "edit")) return homeEdit(ctx);10511052    if (mode == .module) {1053        output.homeModuleManaged();1054        return;1055    }10561057    if (std.mem.eql(u8, ctx.sub, "back")) return homeBack(ctx);1058    if (std.mem.eql(u8, ctx.sub, "history")) return homeHistory(ctx);1059    if (std.mem.eql(u8, ctx.sub, "check")) return homeCheck(ctx);1060    if (std.mem.eql(u8, ctx.sub, "diff")) return homeDiff(ctx);1061    if (std.mem.eql(u8, ctx.sub, "packages")) return homePackages(ctx);10621063    return output.subcommandHelp("home", &home_help, null);1064}10651066fn homePackages(ctx: Ctx) !void {1067    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1068    defer ctx.gpa.free(out);1069    const gens = try parseHomeGenerations(ctx.gpa, out);1070    defer freeHomeGens(ctx.gpa, gens);10711072    output.homePackagesHeader(ctx.machine.name);1073    if (gens.len == 0 or gens[0].path.len == 0) return;10741075    // The generation's OWN references are home-manager's activation deps1076    // (bash, coreutils, ...), not what the user installed. The user's packages1077    // live one level down, in the `…-home-manager-path` env the generation1078    // references — descend into it and list ITS references. Fall back to the1079    // generation refs if that env isn't present (older home-manager layouts).1080    const gen_refs = exec.homeGenerationReferences(ctx.gpa, ctx.io, &ctx.machine, gens[0].path) catch return;1081    defer ctx.gpa.free(gen_refs);10821083    var refs = gen_refs;1084    var env_refs: ?[]u8 = null;1085    defer if (env_refs) |e| ctx.gpa.free(e);1086    if (findHomeManagerPath(gen_refs)) |pkg_path| {1087        if (exec.homeGenerationReferences(ctx.gpa, ctx.io, &ctx.machine, pkg_path)) |e| {1088            env_refs = e;1089            refs = e;1090        } else |_| {}1091    }10921093    // Dedup by name: multi-output derivations (jq, jq-lib, jq-doc) collapse to1094    // the same name after the output suffix is stripped. Keys are slices into1095    // `refs`, valid for this function's lifetime.1096    var seen = std.StringHashMap(void).init(ctx.gpa);1097    defer seen.deinit();1098    var lines = std.mem.splitScalar(u8, refs, '\n');1099    while (lines.next()) |line| {1100        const t = std.mem.trim(u8, line, " \t\r");1101        if (t.len == 0) continue;1102        const row = pkgFromStorePath(t);1103        if (row.version.len == 0) continue;1104        if (std.mem.indexOf(u8, row.name, "home-manager") != null) continue;1105        if (seen.contains(row.name)) continue;1106        seen.put(row.name, {}) catch {};1107        output.listPkg(row.name, row.version);1108    }1109}11101111// The `…-home-manager-path` env among a generation's references — the buildEnv1112// of the user's home.packages. Returns the full store-path line, or null.1113fn findHomeManagerPath(refs: []const u8) ?[]const u8 {1114    var lines = std.mem.splitScalar(u8, refs, '\n');1115    while (lines.next()) |line| {1116        const t = std.mem.trim(u8, line, " \t\r");1117        if (std.mem.indexOf(u8, t, "home-manager-path") != null) return t;1118    }1119    return null;1120}11211122test "findHomeManagerPath picks the env, not the generation or infra" {1123    const refs =1124        \\/nix/store/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-bash-5.31125        \\/nix/store/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb-home-manager-path1126        \\/nix/store/cccccccccccccccccccccccccccccccc-coreutils-9.111127    ;1128    try std.testing.expectEqualStrings(1129        "/nix/store/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb-home-manager-path",1130        findHomeManagerPath(refs).?,1131    );1132    try std.testing.expectEqual(@as(?[]const u8, null), findHomeManagerPath("/nix/store/x-bash-5.3\n"));1133}11341135fn homeDiff(ctx: Ctx) !void {1136    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1137    defer ctx.gpa.free(out);1138    const gens = try parseHomeGenerations(ctx.gpa, out);1139    defer freeHomeGens(ctx.gpa, gens);11401141    // Need two generations and both their store paths to diff their closures.1142    if (gens.len < 2 or gens[0].path.len == 0 or gens[1].path.len == 0) {1143        output.homeNothingToDiff();1144        return;1145    }1146    const newer = gens[0];1147    const older = gens[1];1148    output.homeDiffHeader(older.number, newer.number, ctx.machine.name);1149    if (try exec.diffClosuresPaths(ctx.io, &ctx.machine, ctx.gpa, older.path, newer.path) != 0)1150        return error.ProcessFailed;1151}11521153fn homeCheck(ctx: Ctx) !void {1154    output.homeCheckStart(ctx.machine.name);1155    const code = try exec.homeManagerBuild(ctx.io, &ctx.machine, ctx.gpa);1156    if (code != 0) {1157        output.checkFailed("");1158        return error.BuildFailed;1159    }1160    output.homeCheckOk();1161}11621163fn homeEdit(ctx: Ctx) !void {1164    // Standalone home config lives at ~/.config/home-manager/home.nix; the same1165    // path is what detection keys on for module mode, so it resolves for both.1166    const path = exec.homeNixPath(ctx.gpa, ctx.environ) orelse {1167        errors.error_info.setMessage("could not resolve ~/.config/home-manager/home.nix", .{});1168        return error.ConfigNotFound;1169    };1170    defer ctx.gpa.free(path);1171    output.homeEditOpen(path, ctx.cfg.editor);1172    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, path, null);1173}11741175fn homeHistory(ctx: Ctx) !void {1176    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1177    defer ctx.gpa.free(out);1178    const gens = try parseHomeGenerations(ctx.gpa, out);1179    defer freeHomeGens(ctx.gpa, gens);1180    output.homeHistoryHeader(ctx.machine.name);1181    // Newest-first from home-manager; the first row is the current generation.1182    for (gens, 0..) |g, i| output.homeHistoryRow(g.number, g.date, g.time, i == 0);1183}11841185fn homeBack(ctx: Ctx) !void {1186    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1187    defer ctx.gpa.free(out);1188    const gens = try parseHomeGenerations(ctx.gpa, out);1189    defer freeHomeGens(ctx.gpa, gens);11901191    // Newest-first: [0] is current, [1] is the generation to roll back to.1192    if (gens.len < 2) {1193        output.alreadyOldest();1194        return;1195    }1196    const current = gens[0].number;1197    const prev = gens[1].number;11981199    output.homeBackStart(ctx.machine.name, current, prev);1200    if (ctx.cfg.confirm and !output.confirm("")) return;1201    const code = try exec.homeManagerRollback(ctx.io, &ctx.machine, ctx.gpa);1202    if (code != 0) return error.BuildFailed;1203    output.homeBackDone(prev);1204}12051206fn homeApply(ctx: Ctx, mode: exec.HomeManagerMode) !void {1207    // NixOS/flake module: home config is rebuilt by nixos-rebuild — redirect.1208    if (mode == .module) {1209        output.homeModuleManaged();1210        return;1211    }1212    if (ctx.dry) {1213        output.homeApplyDry(ctx.machine.name);1214        const code = try exec.homeManagerBuild(ctx.io, &ctx.machine, ctx.gpa);1215        if (code != 0) return error.BuildFailed;1216        output.homeApplyDryDone();1217        return;1218    }12191220    output.homeApplyStart(ctx.machine.name);1221    const flake_ref = exec.homeFlakeRef(ctx.gpa, ctx.io, ctx.environ);1222    defer if (flake_ref) |r| ctx.gpa.free(r);1223    if (flake_ref) |ref| {1224        output.printSubstep("home-manager switch --flake {s}", .{ref});1225    } else {1226        output.printSubstep("home-manager switch", .{});1227    }12281229    const start = std.Io.Clock.awake.now(ctx.io);1230    const code = if (flake_ref) |ref|1231        try exec.homeManagerSwitchFlake(ctx.io, &ctx.machine, ctx.gpa, ref)1232    else1233        try exec.homeManagerSwitch(ctx.io, &ctx.machine, ctx.gpa);1234    if (code != 0) return error.BuildFailed;12351236    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());1237    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));1238    output.homeApplyDone(homeCurrentGen(ctx), elapsed);1239}12401241// --- Service commands ---12421243const service_help = [_][2][]const u8{1244    .{ "list", "list running services" },1245    .{ "logs <svc>", "show service logs" },1246    .{ "status <svc>", "service status" },1247    .{ "start <svc>", "start a service" },1248    .{ "stop <svc>", "stop a service" },1249    .{ "restart <svc>", "restart a service" },1250    .{ "enable <svc>", "enable at boot" },1251    .{ "disable <svc>", "disable at boot" },1252};12531254pub fn service(ctx: Ctx) !void {1255    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("service", &service_help, "add --user to act on user services");1256    if (std.mem.eql(u8, ctx.sub, "list")) {1257        output.serviceListHeader(ctx.machine.name);1258        const svcs = exec.serviceList(ctx.gpa, ctx.io, &ctx.machine, ctx.user) catch &.{};1259        defer ctx.gpa.free(svcs);1260        for (svcs) |s| output.serviceRow(s);1261        return;1262    }1263    if (std.mem.eql(u8, ctx.sub, "logs")) {1264        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1265        const follow = ctx.args.len > 1 and std.mem.eql(u8, ctx.args[1], "-f");1266        output.serviceLogsHeader(name, ctx.last, ctx.machine.name);1267        _ = try exec.serviceLogs(ctx.io, &ctx.machine, ctx.gpa, name, ctx.last, follow, ctx.user);1268        return;1269    }1270    if (std.mem.eql(u8, ctx.sub, "status")) {1271        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1272        output.serviceVerb("status", name, ctx.machine.name);1273        _ = try exec.serviceCtl(ctx.io, &ctx.machine, ctx.gpa, "status", name, ctx.user);1274        return;1275    }1276    // start/stop/restart/enable/disable1277    const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1278    if (ctx.cfg.confirm and (std.mem.eql(u8, ctx.sub, "stop") or std.mem.eql(u8, ctx.sub, "disable"))) {1279        if (!output.confirm("")) return;1280    }1281    output.serviceVerb(ctx.sub, name, ctx.machine.name);1282    _ = try exec.serviceCtl(ctx.io, &ctx.machine, ctx.gpa, ctx.sub, name, ctx.user);1283    output.serviceDone();1284}12851286// --- Flake commands ---12871288const flake_help = [_][2][]const u8{1289    .{ "init", "create a new flake.nix" },1290    .{ "update", "update flake inputs" },1291    .{ "update <in>", "update a specific input" },1292    .{ "check", "validate the flake" },1293    .{ "show", "inspect flake outputs" },1294    .{ "lock", "regenerate flake.lock" },1295    .{ "clone <url>", "clone a flake repository" },1296};12971298pub fn flake(ctx: Ctx) !void {1299    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("flake", &flake_help, null);1300    if (std.mem.eql(u8, ctx.sub, "update")) {1301        output.flakeUpdateStart();1302        const input: ?[]const u8 = if (ctx.args.len > 0) ctx.args[0] else null;1303        _ = try exec.flakeUpdate(ctx.io, &ctx.machine, ctx.gpa, input);1304        output.flakeLockWritten();1305        return;1306    }1307    if (std.mem.eql(u8, ctx.sub, "check")) {1308        output.flakeCheckStart();1309        const code = try exec.flakeCheck(ctx.io, &ctx.machine, ctx.gpa);1310        if (code == 0) output.flakeValid() else output.checkFailed("");1311        return;1312    }1313    if (std.mem.eql(u8, ctx.sub, "show")) {1314        const json_out = exec.flakeShow(ctx.gpa, ctx.io, &ctx.machine) catch null;1315        if (json_out) |j| {1316            defer ctx.gpa.free(j);1317            output.flakeShowHeader("flake outputs");1318            // Parse and display the flake outputs1319            const parsed = std.json.parseFromSlice(std.json.Value, ctx.gpa, j, .{}) catch return;1320            defer parsed.deinit();1321            if (parsed.value == .object) {1322                var it = parsed.value.object.iterator();1323                while (it.next()) |entry| {1324                    if (entry.value_ptr.* == .object) {1325                        var inner = entry.value_ptr.object.iterator();1326                        while (inner.next()) |e2| {1327                            const desc = if (e2.value_ptr.* == .object)1328                                if (e2.value_ptr.object.get("description")) |d|1329                                    if (d == .string) d.string else ""1330                                else1331                                    ""1332                            else1333                                "";1334                            output.flakeShowEntry(entry.key_ptr.*, e2.key_ptr.*, desc);1335                        }1336                    }1337                }1338            }1339        }1340        return;1341    }1342    if (std.mem.eql(u8, ctx.sub, "init")) {1343        _ = try exec.flakeInit(ctx.io, &ctx.machine, ctx.gpa);1344        return;1345    }1346    if (std.mem.eql(u8, ctx.sub, "lock")) {1347        _ = try exec.flakeLock(ctx.io, &ctx.machine, ctx.gpa);1348        return;1349    }1350    if (std.mem.eql(u8, ctx.sub, "clone")) {1351        const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1352        _ = try exec.flakeClone(ctx.io, &ctx.machine, ctx.gpa, url);1353        return;1354    }1355}13561357// --- Store commands ---13581359const store_help = [_][2][]const u8{1360    .{ "info", "store size and counts" },1361    .{ "path <attr>", "store path of a package" },1362    .{ "gc", "collect garbage" },1363    .{ "verify", "verify store integrity" },1364    .{ "repair", "repair corrupted paths" },1365};13661367pub fn store(ctx: Ctx) !void {1368    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("store", &store_help, null);1369    if (std.mem.eql(u8, ctx.sub, "gc")) {1370        _ = try exec.storeGc(ctx.io, &ctx.machine, ctx.gpa);1371        return;1372    }1373    if (std.mem.eql(u8, ctx.sub, "verify")) {1374        output.storeVerifyStart();1375        _ = try exec.storeVerify(ctx.io, &ctx.machine, ctx.gpa);1376        return;1377    }1378    if (std.mem.eql(u8, ctx.sub, "repair")) {1379        if (ctx.cfg.confirm and !output.confirm("")) return;1380        output.storeRepairStart();1381        _ = try exec.storeRepair(ctx.io, &ctx.machine, ctx.gpa);1382        return;1383    }1384    if (std.mem.eql(u8, ctx.sub, "info")) {1385        const si = try exec.storeInfo(ctx.gpa, ctx.io, &ctx.machine);1386        output.storeInfo(si);1387        return;1388    }1389    if (std.mem.eql(u8, ctx.sub, "path")) {1390        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1391        const path = try exec.storePath(ctx.gpa, ctx.io, &ctx.machine, attr);1392        defer ctx.gpa.free(path);1393        output.storePath(path);1394        return;1395    }1396    // default: info1397    const si = try exec.storeInfo(ctx.gpa, ctx.io, &ctx.machine);1398    output.storeInfo(si);1399}14001401// --- Channel commands ---14021403const channel_help = [_][2][]const u8{1404    .{ "list", "list channels" },1405    .{ "add <url> [name]", "add a channel" },1406    .{ "remove <name>", "remove a channel" },1407    .{ "update", "update all channels" },1408};14091410pub fn channel(ctx: Ctx) !void {1411    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("channel", &channel_help, null);1412    // On a flake-managed system, nix-channel operations generally don't apply.1413    if (flakeSystem(ctx)) output.flakeChannelNote();1414    if (std.mem.eql(u8, ctx.sub, "list")) {1415        output.channelListHeader(ctx.machine.name);1416        const chans = try exec.channelList(ctx.gpa, ctx.io, &ctx.machine);1417        defer ctx.gpa.free(chans);1418        for (chans) |ch| output.channelRow(ch);1419        return;1420    }1421    if (std.mem.eql(u8, ctx.sub, "add")) {1422        const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1423        const name = if (ctx.args.len > 1) ctx.args[1] else "";1424        _ = try exec.channelAdd(ctx.io, &ctx.machine, ctx.gpa, url, name);1425        output.channelDone();1426        return;1427    }1428    if (std.mem.eql(u8, ctx.sub, "remove")) {1429        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1430        _ = try exec.channelRemove(ctx.io, &ctx.machine, ctx.gpa, name);1431        output.channelDone();1432        return;1433    }1434    if (std.mem.eql(u8, ctx.sub, "update")) {1435        return channelUpdateCmd(ctx);1436    }1437}14381439// --- Profile commands ---14401441pub fn profile(ctx: Ctx) !void {1442    if (std.mem.eql(u8, ctx.sub, "list") or ctx.sub.len == 0) {1443        output.profileListHeader();1444        const out = exec.profileList(ctx.gpa, ctx.io, &ctx.machine) catch null;1445        if (out) |o| {1446            defer ctx.gpa.free(o);1447            var lines = std.mem.splitScalar(u8, o, '\n');1448            while (lines.next()) |line| {1449                const t = std.mem.trim(u8, line, " \t\r");1450                if (t.len == 0) continue;1451                output.profileRow(t, "", "");1452            }1453        }1454        return;1455    }1456    if (std.mem.eql(u8, ctx.sub, "install")) {1457        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1458        _ = try exec.profileInstall(ctx.io, &ctx.machine, ctx.gpa, attr);1459        output.done();1460        return;1461    }1462    if (std.mem.eql(u8, ctx.sub, "remove")) {1463        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1464        _ = try exec.profileRemove(ctx.io, &ctx.machine, ctx.gpa, attr);1465        output.done();1466        return;1467    }1468    if (std.mem.eql(u8, ctx.sub, "upgrade")) {1469        _ = try exec.profileUpgrade(ctx.io, &ctx.machine, ctx.gpa);1470        output.done();1471        return;1472    }1473}14741475// --- Pkg commands ---14761477const pkg_help = [_][2][]const u8{1478    .{ "why <pkg>", "what pulled it in" },1479    .{ "deps <pkg>", "direct dependencies" },1480    .{ "size <pkg>", "closure size" },1481    .{ "path <pkg>", "store path" },1482    .{ "closure <pkg>", "full closure" },1483};14841485pub fn pkg(ctx: Ctx) !void {1486    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("pkg", &pkg_help, null);1487    const name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1488    if (std.mem.eql(u8, ctx.sub, "why")) {1489        if (try exec.pkgWhy(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1490        return;1491    }1492    if (std.mem.eql(u8, ctx.sub, "deps")) {1493        if (try exec.pkgDeps(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1494        return;1495    }1496    if (std.mem.eql(u8, ctx.sub, "size")) {1497        const s = try exec.pkgSize(ctx.gpa, ctx.io, &ctx.machine, name);1498        defer ctx.gpa.free(s);1499        output.pkgResult("size", s);1500        return;1501    }1502    if (std.mem.eql(u8, ctx.sub, "path")) {1503        const p = try exec.storePath(ctx.gpa, ctx.io, &ctx.machine, name);1504        defer ctx.gpa.free(p);1505        output.pkgResult("path", p);1506        return;1507    }1508    if (std.mem.eql(u8, ctx.sub, "closure")) {1509        if (try exec.pkgClosure(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1510        return;1511    }1512}15131514// Top-level alias for `nina pkg why <pkg>` — surfaces what pulled a package in1515// without the user needing to know about the `pkg` subgroup.1516pub fn why(ctx: Ctx) !void {1517    const name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1518    if (try exec.pkgWhy(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1519}15201521// --- Pin / Unpin ---15221523pub fn pin(ctx: Ctx) !void {1524    const input = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1525    const commit = if (ctx.args.len > 1) ctx.args[1] else return error.Internal;1526    exec.editFlakeLock(ctx.gpa, input, commit) catch return error.ProcessFailed;1527    output.pinDone(input, commit);1528}15291530pub fn unpin(ctx: Ctx) !void {1531    const input = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1532    _ = try exec.flakeUpdate(ctx.io, &ctx.machine, ctx.gpa, input);1533    output.unpinDone(input);1534}15351536// --- Hash / Fetch ---15371538pub fn hash(ctx: Ctx) !void {1539    const path = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1540    const h = try exec.nixHash(ctx.gpa, ctx.io, &ctx.machine, path);1541    defer ctx.gpa.free(h);1542    output.hashResult(std.mem.trim(u8, h, " \t\n\r"));1543}15441545pub fn fetch(ctx: Ctx) !void {1546    const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1547    const h = try exec.nixFetch(ctx.gpa, ctx.io, &ctx.machine, url);1548    defer ctx.gpa.free(h);1549    output.fetchResult(std.mem.trim(u8, h, " \t\n\r"), url);1550}15511552// --- Build / Run ---15531554pub fn build(ctx: Ctx) !void {1555    const attr: ?[]const u8 = if (ctx.args.len > 0) ctx.args[0] else null;1556    output.buildStart(attr orelse "default");1557    const code = try exec.nixBuild(ctx.io, &ctx.machine, ctx.gpa, attr);1558    if (code != 0) return error.BuildFailed;1559    output.buildDone();1560}15611562pub fn runCmd(ctx: Ctx) !void {1563    const pkg_arg = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1564    output.runStart(pkg_arg);1565    _ = try exec.nixRun(ctx.io, &ctx.machine, ctx.gpa, pkg_arg);1566}15671568// --- Hello ---15691570pub fn hello(ctx: Ctx) !void {1571    output.hello(ctx.cfg.machines);1572}15731574const ConfigKind = enum { flake, channel, none };15751576// Scan the conventional /etc/nixos for a flake.nix (flake-based) or a1577// configuration.nix (channel-based) to pre-fill the wizard's defaults.1578fn scanConfig(io: std.Io) ConfigKind {1579    if (exec.pathExists(io, "/etc/nixos/flake.nix")) return .flake;1580    if (exec.pathExists(io, "/etc/nixos/configuration.nix")) return .channel;1581    return .none;1582}15831584// Runs when the config is absent on first invocation (interactive TTY only).1585// Scans for an existing nixos config, detects flake vs channel, and offers a1586// smart default path — flake-ness is detected, never asked.1587pub fn firstRunWizard(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) !void {1588    output.firstRunBanner();1589    output.firstRunNoConfig();15901591    var name_buf: [256]u8 = undefined;1592    var path_buf: [256]u8 = undefined;15931594    const machine_name = output.firstRunPrompt("machine name", "my-machine", &name_buf);15951596    output.firstRunScanning();1597    const kind = scanConfig(io);1598    switch (kind) {1599        .flake => output.firstRunDetected("/etc/nixos/flake.nix", true),1600        .channel => output.firstRunDetected("/etc/nixos/configuration.nix", false),1601        .none => output.firstRunNoneFound(),1602    }16031604    // Detected systems default to /etc/nixos (press enter to confirm); when1605    // nothing was found, leave the default empty so the user must type a path.1606    const default_path: []const u8 = if (kind == .none) "" else "/etc/nixos";1607    const config_path = output.firstRunPromptDefault("config path", default_path, kind != .none, &path_buf);16081609    // Re-detect at the chosen path in case the user pointed elsewhere — flake.nix1610    // there means a flake system, recorded so channel commands warn appropriately.1611    const use_flakes = exec.dirHasFlake(gpa, io, config_path);16121613    const conf_path = try config.configPath(gpa, environ);1614    defer gpa.free(conf_path);1615    if (std.fs.path.dirname(conf_path)) |dir| exec.ensureDir(gpa, io, dir);16161617    // `flake` is a top-level config field, so it must precede the [machine] block.1618    const flake_line = if (use_flakes) "flake = true\n" else "";1619    var content_buf: [1024]u8 = undefined;1620    const content = try std.fmt.bufPrint(1621        &content_buf,1622        "{s}[machine]\nname = {s}\nconfig = {s}\nlocal = true\n",1623        .{ flake_line, machine_name, config_path },1624    );16251626    const file = std.Io.Dir.createFile(.cwd(), io, conf_path, .{}) catch {1627        errors.error_info.setMessage("could not write {s}", .{conf_path});1628        return error.Internal;1629    };1630    defer file.close(io);1631    file.writePositionalAll(io, content, 0) catch {1632        errors.error_info.setMessage("could not write {s}", .{conf_path});1633        return error.Internal;1634    };16351636    output.firstRunWritten(conf_path);1637}16381639pub fn setup(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) !void {1640    // Create the config first if it doesn't exist. This makes `nina setup`1641    // a complete onboarding command — not just a nix-features check. Any legacy1642    // ~/.nina.conf is migrated to the XDG path before we decide to run the wizard.1643    config.migrateLegacyConfig(gpa, io, environ);1644    if (config.configPath(gpa, environ)) |conf_path| {1645        defer gpa.free(conf_path);1646        if (std.Io.Dir.openFile(.cwd(), io, conf_path, .{})) |f| {1647            f.close(io);1648        } else |_| {1649            try firstRunWizard(gpa, io, environ);1650            errors.error_info.reset();1651        }1652    } else |_| {}16531654    output.setupCheck();1655    const status = exec.checkNixFeatures(gpa, io, environ);1656    output.setupFeatures(status.nix_command, status.flakes);16571658    if (status.allEnabled()) {1659        output.setupAllSet();1660        api.ensureRegistryPinned(gpa, io, environ);1661        return;1662    }16631664    // On NixOS the features belong in configuration.nix (the declarative,1665    // permanent home), not ~/.config/nix/nix.conf. Offer to add the one line;1666    // the user runs the rebuild. We don't pin the registry here because the1667    // features aren't live until that rebuild lands.1668    if (exec.isNixOS(io)) {1669        const conf_path = "/etc/nixos/configuration.nix";1670        if (exec.nixosConfigEnablesFeatures(gpa, io, conf_path)) {1671            output.setupNixosNeedsRebuild(conf_path);1672            return;1673        }1674        output.setupNixosOffer(exec.NIXOS_FEATURES_LINE, conf_path);1675        if (output.confirmDefaultNo("add it now?")) {1676            if (exec.appendFeaturesToNixosConfig(gpa, io, environ, conf_path)) |_| {1677                output.setupNixosWrote(conf_path);1678            } else |_| {1679                output.setupNixosManual(exec.NIXOS_FEATURES_LINE, conf_path);1680            }1681        } else {1682            output.setupNixosManual(exec.NIXOS_FEATURES_LINE, conf_path);1683        }1684        return;1685    }16861687    // Non-NixOS: a user-level nix.conf takes effect immediately, no sudo needed.1688    output.setupEnabling();1689    const path = try exec.enableNixFeatures(gpa, io, environ);1690    defer gpa.free(path);16911692    output.setupDone(path);1693    api.ensureRegistryPinned(gpa, io, environ);1694}16951696// --- Log helper ---16971698fn logAction(ctx: Ctx, action: []const u8, gen: u32) void {1699    var ts_buf: [32]u8 = undefined;1700    const ts = nowIso(ctx.io, &ts_buf);1701    var buf: [256]u8 = undefined;1702    const entry = std.fmt.bufPrint(&buf, "{{\"ts\":\"{s}\",\"machine\":\"{s}\",\"command\":\"{s}\",\"outcome\":\"success\",\"gen_before\":null,\"gen_after\":{d},\"duration_ms\":0}}\n", .{1703        ts, ctx.machine.name, action, gen,1704    }) catch return;1705    exec.appendNinaLog(ctx.io, ctx.environ, entry);1706}17071708// Wall-clock UTC as ISO-8601. Uses Io.Clock.real (the settable Unix-epoch clock);1709// Io.Clock.awake is monotonic and unsuitable for timestamps. Falls back to epoch 0.1710fn nowIso(io: std.Io, buf: []u8) []const u8 {1711    const fallback = "1970-01-01T00:00:00Z";1712    const ns = std.Io.Clock.real.now(io).toNanoseconds();1713    if (ns <= 0) return fallback;1714    const secs: u64 = @intCast(@divFloor(ns, 1_000_000_000));1715    const es = std.time.epoch.EpochSeconds{ .secs = secs };1716    const ed = es.getEpochDay();1717    const yd = ed.calculateYearDay();1718    const md = yd.calculateMonthDay();1719    const ds = es.getDaySeconds();1720    return std.fmt.bufPrint(buf, "{d:0>4}-{d:0>2}-{d:0>2}T{d:0>2}:{d:0>2}:{d:0>2}Z", .{1721        yd.year,              md.month.numeric(),      @as(u32, md.day_index) + 1,1722        ds.getHoursIntoDay(), ds.getMinutesIntoHour(), ds.getSecondsIntoMinute(),1723    }) catch return fallback;1724}