edit: add --dir flag to open config directory instead of file

@@ -837,9 +837,19 @@837837 }838838 839839 pub fn edit(ctx: Ctx) !void {840-    const hardware = ctx.args.len > 0 and std.mem.eql(u8, ctx.args[0], "hardware");841-    const filename = if (hardware) "hardware-configuration.nix" else "configuration.nix";842-    const path = try std.fmt.allocPrint(ctx.gpa, "{s}/{s}", .{ ctx.machine.config_path, filename });840+    // --dir opens the whole config directory (for editors that work better with841+    // a folder open), as root so root-owned config trees like /etc/nixos work.842+    var open_dir = false;843+    for (ctx.args) |arg| {844+        if (std.mem.eql(u8, arg, "--dir")) open_dir = true;845+    }846+    if (open_dir) {847+        output.editOpen(ctx.machine.config_path, ctx.cfg.editor);848+        _ = try exec.openEditorSudo(ctx.io, ctx.gpa, ctx.cfg.editor, ctx.machine.config_path);849+        return;850+    }851+852+    const path = try std.fmt.allocPrint(ctx.gpa, "{s}/configuration.nix", .{ctx.machine.config_path});843853     defer ctx.gpa.free(path);844854     output.editOpen(path, ctx.cfg.editor);845855     _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, path, null);

@@ -1386,6 +1386,13 @@13861386     return stream(io, &types.Machine{}, gpa, &.{ editor, path });13871387 }13881388 1389+// Open a config directory as root with `sudo -E <editor> <path>` — `-E`1390+// preserves the user's environment (PATH, TERM, EDITOR config) so the editor1391+// behaves the same as it does unprivileged. Used by `nina edit --dir`.1392+pub fn openEditorSudo(io: std.Io, gpa: std.mem.Allocator, editor: []const u8, path: []const u8) !u8 {1393+    return stream(io, &types.Machine{}, gpa, &.{ "sudo", "-E", editor, path });1394+}1395+13891396 pub fn diffClosures(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, a: u32, b: u32) !u8 {13901397     const a_str = try std.fmt.allocPrint(gpa, "/nix/var/nix/profiles/system-{d}-link", .{a});13911398     defer gpa.free(a_str);

@@ -294,6 +294,9 @@294294         } else if (std.mem.eql(u8, a, "--switch")) {295295             // --switch flag for `home init` (activate after init)296296             try rest.append(arena, "--switch");297+        } else if (std.mem.eql(u8, a, "--dir")) {298+            // --dir flag for `nina edit` (open the config directory)299+            try rest.append(arena, "--dir");297300         } else if (a.len > 0 and a[0] != '-') {298301             try rest.append(arena, a);299302         }

@@ -936,6 +936,7 @@936936         .{ "try <pkg>", "test without installing" },937937         .{ "list", "show installed packages" },938938         .{ "edit", "open configuration.nix" },939+        .{ "edit --dir", "open config directory" },939940         .{ "check", "validate config" },940941         .{ "diff", "changes between generations" },941942         .{ "status", "machine health" },