feat: separate column toggle buttons

src/kanban/buildKanbanBoard.test.ts

@@ -21,7 +21,11 @@ function task(partial: Partial<Task> & Pick<Task, "id" | "title">): Task {
 	};
 }
 
-const visibleStatuses = TASK_STATUS_ORDER.filter(
+const defaultHiddenStatuses = TASK_STATUS_ORDER.filter(
+	(status) => TASK_STATUS_META[status].defaultHidden,
+);
+
+const visibleByDefaultStatuses = TASK_STATUS_ORDER.filter(
 	(status) => !TASK_STATUS_META[status].defaultHidden,
 );
 
@@ -65,19 +69,21 @@ describe("buildKanbanBoard", () => {
 		}),
 	];
 
-	it("hides defaultHidden statuses by default", () => {
+	it("hides all defaultHidden statuses by default", () => {
 		const board = buildKanbanBoard(tasks);
 		const statuses = board.columns.map((col) => col.status);
 
-		expect(statuses).toEqual(visibleStatuses);
+		expect(statuses).toEqual(visibleByDefaultStatuses);
 		for (const col of board.columns) {
 			expect(TASK_STATUS_META[col.status].defaultHidden).toBe(false);
 			expect(col.label).toBe(TASK_STATUS_META[col.status].label);
 		}
 	});
 
-	it("includes all statuses when showHiddenStatuses is true", () => {
-		const board = buildKanbanBoard(tasks, { showHiddenStatuses: true });
+	it("includes all statuses when all defaultHidden statuses are in shownHiddenColumns", () => {
+		const board = buildKanbanBoard(tasks, {
+			shownHiddenColumns: [...defaultHiddenStatuses],
+		});
 
 		expect(board.columns.map((col) => col.status)).toEqual(TASK_STATUS_ORDER);
 		for (const col of board.columns) {
@@ -85,8 +91,31 @@ describe("buildKanbanBoard", () => {
 		}
 	});
 
+	it("shows only selected hidden columns", () => {
+		const board = buildKanbanBoard(tasks, {
+			shownHiddenColumns: [TaskStatus.BACKLOG],
+		});
+		const statuses = board.columns.map((col) => col.status);
+
+		expect(statuses).toContain(TaskStatus.BACKLOG);
+		expect(statuses).not.toContain(TaskStatus.CANCELLED);
+		expect(statuses).not.toContain(TaskStatus.UNKNOWN);
+		for (const status of visibleByDefaultStatuses) {
+			expect(statuses).toContain(status);
+		}
+	});
+
+	it("empty shownHiddenColumns hides all defaultHidden columns", () => {
+		const board = buildKanbanBoard(tasks, { shownHiddenColumns: [] });
+		const statuses = board.columns.map((col) => col.status);
+
+		expect(statuses).toEqual(visibleByDefaultStatuses);
+	});
+
 	it("places each task into the column matching its status", () => {
-		const board = buildKanbanBoard(tasks, { showHiddenStatuses: true });
+		const board = buildKanbanBoard(tasks, {
+			shownHiddenColumns: [...defaultHiddenStatuses],
+		});
 
 		for (const col of board.columns) {
 			for (const t of col.tasks) {
@@ -113,7 +142,9 @@ describe("buildKanbanBoard", () => {
 	it("returns empty visible columns when there are no tasks", () => {
 		const board = buildKanbanBoard([]);
 
-		expect(board.columns.map((col) => col.status)).toEqual(visibleStatuses);
+		expect(board.columns.map((col) => col.status)).toEqual(
+			visibleByDefaultStatuses,
+		);
 		for (const col of board.columns) {
 			expect(col.tasks).toEqual([]);
 		}

src/kanban/buildKanbanBoard.ts

@@ -16,8 +16,8 @@ export type KanbanBoard = {
 };
 
 export type BuildKanbanBoardOptions = {
-	/** When false (default), columns with meta.defaultHidden are omitted. */
-	showHiddenStatuses?: boolean;
+	/** `defaultHidden`-statuses to show; empty/undefined = hide all hidden. */
+	shownHiddenColumns?: TaskStatus[];
 };
 
 /** Build status columns; empty columns kept. Hidden statuses optional. */
@@ -25,9 +25,11 @@ export function buildKanbanBoard(
 	tasks: Task[],
 	options: BuildKanbanBoardOptions = {},
 ): KanbanBoard {
-	const showHidden = options.showHiddenStatuses ?? false;
+	const extraVisible = options.shownHiddenColumns ?? [];
 	const statuses = TASK_STATUS_ORDER.filter(
-		(status) => showHidden || !TASK_STATUS_META[status].defaultHidden,
+		(status) =>
+			!TASK_STATUS_META[status].defaultHidden ||
+			extraVisible.includes(status),
 	);
 
 	const columns: KanbanColumn[] = statuses.map((status) => {

src/kanban/messages.test.ts

@@ -49,12 +49,6 @@ describe("parseKanbanInboundMessage", () => {
 		).toEqual(ok({ variant: "setScopeFilter", scope: "all" }));
 	});
 
-	it("parses setShowHidden", () => {
-		expect(
-			parseKanbanInboundMessage({ variant: "setShowHidden", showHidden: true }),
-		).toEqual(ok({ variant: "setShowHidden", showHidden: true }));
-	});
-
 	it("parses createTask", () => {
 		expect(
 			parseKanbanInboundMessage({
@@ -64,6 +58,30 @@ describe("parseKanbanInboundMessage", () => {
 		).toEqual(ok({ variant: "createTask", status: TaskStatus.BACKLOG }));
 	});
 
+	it("parses toggleHiddenColumn", () => {
+		expect(
+			parseKanbanInboundMessage({
+				variant: "toggleHiddenColumn",
+				status: TaskStatus.BACKLOG,
+			}),
+		).toEqual(
+			ok({
+				variant: "toggleHiddenColumn",
+				status: TaskStatus.BACKLOG,
+			} satisfies KanbanInboundMessage),
+		);
+	});
+
+	it("rejects toggleHiddenColumn with invalid status", () => {
+		const result = parseKanbanInboundMessage({
+			variant: "toggleHiddenColumn",
+			status: "__not_a_status__",
+		});
+		expect(result.isErr()).toBe(true);
+		if (result.isOk()) return;
+		expect(result.error.variant).toBe(AppErrorVariant.INVALID_MESSAGE);
+	});
+
 	it("rejects non-objects", () => {
 		const result = parseKanbanInboundMessage(null);
 		expect(result.isErr()).toBe(true);

src/kanban/messages.ts

@@ -11,8 +11,8 @@ export type KanbanInboundMessage =
 	| { variant: "refresh" }
 	| { variant: "moveTask"; id: string; status: TaskStatus }
 	| { variant: "setScopeFilter"; scope: KanbanScopeFilter }
-	| { variant: "setShowHidden"; showHidden: boolean }
-	| { variant: "createTask"; status: TaskStatus };
+	| { variant: "createTask"; status: TaskStatus }
+	| { variant: "toggleHiddenColumn"; status: TaskStatus };
 
 export function isKanbanScopeFilter(
 	value: unknown,
@@ -66,13 +66,6 @@ export function parseKanbanInboundMessage(
 			return ok({ variant: "setScopeFilter", scope: raw.scope });
 		}
 
-		case "setShowHidden": {
-			if (typeof raw.showHidden !== "boolean") {
-				return invalid(variant);
-			}
-			return ok({ variant: "setShowHidden", showHidden: raw.showHidden });
-		}
-
 		case "createTask": {
 			if (!isTaskStatus(raw.status)) {
 				return invalid(variant);
@@ -80,6 +73,13 @@ export function parseKanbanInboundMessage(
 			return ok({ variant: "createTask", status: raw.status });
 		}
 
+		case "toggleHiddenColumn": {
+			if (!isTaskStatus(raw.status)) {
+				return invalid(variant);
+			}
+			return ok({ variant: "toggleHiddenColumn", status: raw.status });
+		}
+
 		default:
 			return invalid(variant);
 	}

src/kanban/outboundMessages.ts

@@ -1,5 +1,6 @@
 import { AppError } from "@/error";
 import { TaskScope } from "@/model/taskLocation";
+import { TaskStatus } from "@/model/taskStatus";
 import { KanbanBoard } from "./buildKanbanBoard";
 import { KanbanScopeFilter } from "./messages";
 
@@ -9,7 +10,8 @@ export type KanbanOutboundMessage =
 			variant: "state";
 			board: KanbanBoard;
 			scopeFilter: KanbanScopeFilter;
-			showHidden: boolean;
+			shownHiddenColumns: TaskStatus[];
+			defaultHiddenStatuses: TaskStatus[];
 			availableScopes: TaskScope[];
 	  }
 	| { variant: "error"; error: AppError };

src/views/taskKanbanHtml.ts

@@ -76,6 +76,46 @@ export function getTaskKanbanHtml(
       line-height: 1.2;
       min-width: 24px;
     }
+    button.eye-btn {
+      padding: 0 4px;
+      font-size: 0.85em;
+      line-height: 1.2;
+      min-width: 20px;
+      background: transparent;
+      border: 1px solid transparent;
+      color: var(--vscode-foreground);
+      opacity: 0.6;
+      cursor: pointer;
+    }
+    button.eye-btn:hover { opacity: 1; }
+    #visibility-bar {
+      display: flex;
+      flex-wrap: wrap;
+      align-items: center;
+      gap: 4px;
+      padding: 4px 12px;
+      border-bottom: 1px solid var(--vscode-panel-border, var(--vscode-widget-border));
+      font-size: 0.85em;
+    }
+    #visibility-bar .label {
+      opacity: 0.7;
+      margin-right: 4px;
+    }
+    #visibility-bar button {
+      font: inherit;
+      cursor: pointer;
+      padding: 2px 8px;
+      border: 1px solid var(--vscode-input-border, transparent);
+      border-radius: 2px;
+      background: var(--vscode-input-background);
+      color: var(--vscode-input-foreground);
+      font-size: 0.85em;
+    }
+    #visibility-bar button.shown {
+      background: var(--vscode-button-background);
+      color: var(--vscode-button-foreground);
+      border-color: transparent;
+    }
     #status-line {
       font-size: 0.85em;
       opacity: 0.85;
@@ -147,11 +187,11 @@ export function getTaskKanbanHtml(
     <h1>Kanban</h1>
     <label for="scopeFilter">Scope</label>
     <select id="scopeFilter" title="Project / Global filter"></select>
-    <button id="toggleHidden" type="button" class="secondary" title="Show or hide backlog and cancelled">Show hidden</button>
     <span class="spacer"></span>
     <span id="status-line"></span>
     <button id="refresh" type="button" class="secondary" title="Refresh">↻</button>
   </header>
+  <div id="visibility-bar"></div>
   <div id="board"></div>
   <script nonce="${nonce}">
     const vscode = acquireVsCodeApi();
@@ -164,11 +204,12 @@ export function getTaskKanbanHtml(
     const statusLine = document.getElementById("status-line");
     const refreshBtn = document.getElementById("refresh");
     const scopeFilterEl = document.getElementById("scopeFilter");
-    const toggleHiddenBtn = document.getElementById("toggleHidden");
+    const visibilityBarEl = document.getElementById("visibility-bar");
 
     let board = { columns: [] };
     let scopeFilter = "all";
-    let showHidden = false;
+    let shownHiddenColumns = [];
+    let defaultHiddenStatuses = [];
     let availableScopes = [];
     let dragTaskId = null;
 
@@ -214,13 +255,30 @@ export function getTaskKanbanHtml(
         .join("");
     }
 
-    function renderToggleHidden() {
-      toggleHiddenBtn.textContent = showHidden ? "Hide backlog/cancelled" : "Show hidden";
+    function renderVisibilityBar() {
+      visibilityBarEl.innerHTML = "";
+      if (defaultHiddenStatuses.length === 0) return;
+      const label = document.createElement("span");
+      label.className = "label";
+      label.textContent = "Columns:";
+      visibilityBarEl.appendChild(label);
+      for (const status of defaultHiddenStatuses) {
+        const btn = document.createElement("button");
+        btn.textContent = status;
+        btn.dataset.status = status;
+        if (shownHiddenColumns.indexOf(status) >= 0) {
+          btn.classList.add("shown");
+        }
+        btn.addEventListener("click", () => {
+          post({ variant: "toggleHiddenColumn", status: status });
+        });
+        visibilityBarEl.appendChild(btn);
+      }
     }
 
     function render() {
       renderScopeFilter();
-      renderToggleHidden();
+      renderVisibilityBar();
       boardEl.innerHTML = "";
       for (const column of board.columns || []) {
         const col = document.createElement("section");
@@ -308,17 +366,14 @@ export function getTaskKanbanHtml(
       post({ variant: "setScopeFilter", scope: scopeFilterEl.value });
     });
 
-    toggleHiddenBtn.addEventListener("click", () => {
-      post({ variant: "setShowHidden", showHidden: !showHidden });
-    });
-
     window.addEventListener("message", (event) => {
       const message = event.data;
       if (!message || typeof message !== "object") return;
       if (message.variant === "state") {
         board = message.board || { columns: [] };
         scopeFilter = message.scopeFilter || "all";
-        showHidden = Boolean(message.showHidden);
+        shownHiddenColumns = message.shownHiddenColumns || [];
+        defaultHiddenStatuses = message.defaultHiddenStatuses || [];
         availableScopes = message.availableScopes || [];
         setStatus("");
         render();

src/views/taskKanbanPanel.ts

@@ -12,7 +12,7 @@ import {
 import { KanbanOutboundMessage } from "@/kanban/outboundMessages";
 import { appError, AppErrorVariant } from "@/error";
 import { LocatedTask, TaskLocation, TaskScope } from "@/model/taskLocation";
-import { TaskStatus } from "@/model/taskStatus";
+import { TaskStatus, TASK_STATUS_META, TASK_STATUS_ORDER } from "@/model/taskStatus";
 import { IConfigProvider, ITaskRepository } from "@/ports";
 import { presentError } from "@/ui/presentError";
 import { TASK_SCOPE_LABELS } from "@/ui/taskLabels";
@@ -60,7 +60,7 @@ export class TaskKanbanPanel {
 
 	#tasks: LocatedTask[] = [];
 	#scopeFilter: KanbanScopeFilter = "all";
-	#showHidden = false;
+	#shownHiddenColumns: TaskStatus[] = [];
 	#disposed = false;
 
 	constructor(panel: vscode.WebviewPanel, deps: TaskKanbanDeps) {
@@ -125,9 +125,8 @@ export class TaskKanbanPanel {
 				this.#postState();
 				return;
 
-			case "setShowHidden":
-				this.#showHidden = message.showHidden;
-				this.#postState();
+			case "toggleHiddenColumn":
+				this.#toggleHiddenColumn(message.status);
 				return;
 
 			case "createTask":
@@ -201,6 +200,16 @@ export class TaskKanbanPanel {
 		this.#deps.onTasksMutated?.();
 	}
 
+	#toggleHiddenColumn(status: TaskStatus): void {
+		const index = this.#shownHiddenColumns.indexOf(status);
+		if (index >= 0) {
+			this.#shownHiddenColumns.splice(index, 1);
+		} else {
+			this.#shownHiddenColumns.push(status);
+		}
+		this.#postState();
+	}
+
 	async #pickLocationForCreate(): Promise<TaskLocation | undefined> {
 		const locations = resolveTaskLocations(this.#deps.config);
 		if (locations.length === 0) {
@@ -251,13 +260,17 @@ export class TaskKanbanPanel {
 	#postState(): void {
 		const board = buildKanbanBoard(
 			this.#filteredTasks().map((item) => item.task),
-			{ showHiddenStatuses: this.#showHidden },
+			{ shownHiddenColumns: this.#shownHiddenColumns },
 		);
+
 		this.#post({
 			variant: "state",
 			board,
 			scopeFilter: this.#scopeFilter,
-			showHidden: this.#showHidden,
+			shownHiddenColumns: this.#shownHiddenColumns,
+			defaultHiddenStatuses: TASK_STATUS_ORDER.filter(
+				(s) => TASK_STATUS_META[s].defaultHidden,
+			),
 			availableScopes: this.#availableScopes(),
 		});
 	}