implement Command interface

src/heavens-net/App.zig

@@ -2,49 +2,42 @@ const std    = @import("std");
 const dvui   = @import("dvui");
 const hncore = @import("hncore");
 
-const win = @import("./win/root.zig");
+const compo = @import("./compo/root.zig");
 
 const Self = @This();
 
-alloc: std.mem.Allocator,
-today: win.today.Mock,
+stage: compo.stage.Mock,
+search: compo.search.Mock,
+taskedit: compo.taskedit.Mock,
 
 pub fn init(alloc: std.mem.Allocator) !Self {
     return Self {
-        .alloc = alloc,
-        .today = try win.today.Mock.init(alloc),
+        .search   = try compo.search.Mock.init(alloc),
+        .stage    = try compo.stage.Mock.init(alloc),
+        .taskedit = try compo.taskedit.Mock.init(alloc),
     };
 }
 pub fn deinit(self: *Self) void {
-    self.today.deinit();
+    self.taskedit.deinit();
+    self.stage.deinit();
+    self.search.deinit();
 }
 
 pub fn gui(self: *Self) !void {
-    // ---- menu
+    try compo.menu.gui(.{});
+
+    // background
     {
-        var root = try dvui.menu(@src(), .horizontal, .{ .background = true, .expand = .horizontal });
-        defer root.deinit();
-
-        if (try dvui.menuItemLabel(@src(), "File", .{ .submenu = true }, .{})) |r| {
-            var float = try dvui.floatingMenu(
-                @src(), .{.from = dvui.Rect.fromPoint(dvui.Point{ .x = r.x, .y = r.y + r.h })}, .{});
-            defer float.deinit();
-
-            if (try dvui.menuItemLabel(@src(), "Open", .{}, .{})) |_| {
-            }
-        }
-    }
-
-    // ---- project tabs
-    {
-        var tbox = try dvui.box(@src(), .vertical, .{
+        var box = try dvui.box(@src(), .vertical, .{
             .expand = .both,
             .background = true,
-            .color_fill = .{ .name = .fill_window },
+            .color_fill = .{ .color = dvui.Color.white, },
         });
-        defer tbox.deinit();
+        defer box.deinit();
     }
 
     // ---- windows
-    try win.today.gui(&self.today);
+    try compo.search.gui(&self.search);
+    try compo.stage.gui(&self.stage);
+    try compo.taskedit.gui(&self.taskedit);
 }

src/heavens-net/compo/menu.zig

@@ -0,0 +1,36 @@
+const std  = @import("std");
+const dvui = @import("dvui");
+
+pub fn gui(ctx: anytype) !void {
+    _ = ctx;
+
+    var root = try dvui.menu(@src(), .horizontal, .{ .background = true, .expand = .horizontal });
+    defer root.deinit();
+
+    if (try dvui.menuItemLabel(@src(), "Workspace", .{ .submenu = true }, .{})) |r| {
+        var float = try dvui.floatingMenu(
+            @src(), .{.from = dvui.Rect.fromPoint(dvui.Point{ .x = r.x, .y = r.y + r.h })}, .{});
+        defer float.deinit();
+
+        if (try dvui.menuItemLabel(@src(), "New", .{}, .{})) |_| {
+        }
+        if (try dvui.menuItemLabel(@src(), "Open", .{}, .{})) |_| {
+        }
+
+        try dvui.separator(@src(), .{});
+
+        if (try dvui.menuItemLabel(@src(), "Save", .{}, .{})) |_| {
+        }
+        if (try dvui.menuItemLabel(@src(), "Save as", .{}, .{})) |_| {
+        }
+    }
+
+    if (try dvui.menuItemLabel(@src(), "Task", .{ .submenu = true }, .{})) |r| {
+        var float = try dvui.floatingMenu(
+            @src(), .{.from = dvui.Rect.fromPoint(dvui.Point{ .x = r.x, .y = r.y + r.h })}, .{});
+        defer float.deinit();
+
+        if (try dvui.menuItemLabel(@src(), "New", .{}, .{})) |_| {
+        }
+    }
+}

src/heavens-net/compo/root.zig

@@ -0,0 +1,5 @@
+pub const menu     = @import("./menu.zig");
+pub const search   = @import("./search.zig");
+pub const stage    = @import("./stage.zig");
+pub const taskcard = @import("./taskcard.zig");
+pub const taskedit = @import("./taskedit.zig");

src/heavens-net/compo/search.zig

@@ -0,0 +1,119 @@
+const std  = @import("std");
+const dvui = @import("dvui");
+
+const ui    = @import("../ui/root.zig");
+const compo = @import("./root.zig");
+
+pub const Task = struct {
+    id: usize,
+    summary: [:0]const u8,
+
+    done    : bool = false,
+    staged  : bool = false,
+    archived: bool = false,
+};
+
+pub fn gui(ctx: anytype) !void {
+    var win = try dvui.floatingWindow(@src(), .{}, .{});
+    defer win.deinit();
+
+    try dvui.windowHeader("Search", "", null);
+
+    // task adder
+    {
+        var adder = try dvui.textEntry(@src(), .{}, .{
+            .expand = .horizontal,
+        });
+        defer adder.deinit();
+
+        if (dvui.focusedWidgetId() == adder.data().id) {
+            if (ui.event.keyPress("activate")) {
+                std.debug.print("hello\n", .{});
+            }
+        }
+    }
+
+    // task list
+    {
+        var scrollArea = try dvui.scrollArea(@src(), .{}, .{
+            .expand = .both,
+        });
+        defer scrollArea.deinit();
+
+        var list = try dvui.box(@src(), .vertical, .{
+            .expand  = .both,
+            .padding = dvui.Rect.all(4),
+        });
+        defer list.deinit();
+
+        for (0.., ctx.tasks()) |idx, task| {
+            if (idx > 0) {
+                _ = try dvui.spacer(@src(), .{ .w = 0, .h = 4}, .{
+                    .id_extra = idx,
+                    .expand   = .horizontal,
+                });
+            }
+
+            var subctx = TaskCardCtx(@TypeOf(ctx)) { .ctx = ctx, .task = task };
+            try compo.taskcard.gui(@src(), &subctx);
+        }
+
+        try dvui.labelNoFmt(@src(), "no tasks anymore :)", .{ .gravity_x = 0.5 });
+    }
+}
+
+fn TaskCardCtx(T: type) type {
+    return struct {
+        const Self = @This();
+
+        ctx : T,
+        task: Task,
+
+        pub fn open(self: *Self) void {
+            _ = self;
+            std.debug.print("OPEN\n", .{});
+        }
+
+        pub fn id(self: *const Self) usize {
+            return self.task.id;
+        }
+        pub fn summary(self: *const Self) []const u8 {
+            return self.task.summary;
+        }
+        pub fn done(self: *const Self) bool {
+            return self.task.done;
+        }
+        pub fn archived(self: *const Self) bool {
+            return self.task.archived;
+        }
+        pub fn staged(self: *const Self) bool {
+            return self.task.staged;
+        }
+    };
+}
+
+pub const Mock = struct {
+    const Self     = @This();
+    const TaskList = std.ArrayList(Task);
+
+    _tasks: TaskList,
+
+    pub fn init(alloc: std.mem.Allocator) !Self {
+        var ts = TaskList.init(alloc);
+        errdefer ts.deinit();
+
+        try ts.append(Task { .id = 0, .summary = "helloworld", });
+        try ts.append(Task { .id = 1, .summary = "goodbye", });
+
+        return Mock {
+            ._tasks = ts,
+        };
+    }
+    pub fn deinit(self: *Self) void {
+        self._tasks.deinit();
+    }
+
+    fn tasks(self: *const Self) []const Task {
+        return self._tasks.items;
+    }
+};

src/heavens-net/compo/stage.zig

@@ -0,0 +1,124 @@
+const std  = @import("std");
+const dvui = @import("dvui");
+
+const compo = @import("./root.zig");
+
+pub const Task = struct {
+    id: usize,
+    summary: [:0]const u8,
+    done: bool,
+};
+
+pub fn gui(ctx: anytype) !void {
+    var win = try dvui.floatingWindow(@src(), .{}, .{});
+    defer win.deinit();
+
+    try dvui.windowHeader("Stage", "", null);
+
+    var scrollArea = try dvui.scrollArea(@src(), .{}, .{
+        .expand = .both,
+    });
+    defer scrollArea.deinit();
+
+    var reorder = try dvui.reorder(@src(), .{
+        .background = true,
+        .expand     = .both,
+    });
+    defer reorder.deinit();
+
+    var list = try dvui.box(@src(), .vertical, .{
+        .expand  = .both,
+        .padding = dvui.Rect.all(4),
+    });
+    defer list.deinit();
+
+    const tasks = ctx.get_tasks();
+    for (0.., tasks) |idx, task| {
+        if (idx > 0) {
+            _ = try dvui.spacer(@src(), .{ .w = 0, .h = 4}, .{
+                .id_extra = idx,
+                .expand   = .horizontal,
+            });
+        }
+
+        var reorderable = try reorder.reorderable(@src(), .{
+            .draw_target = false,
+        }, .{
+            .id_extra = idx,
+            .expand   = .horizontal,
+        });
+        defer reorderable.deinit();
+
+        var subctx = TaskCardCtx(@TypeOf(ctx)) {
+            .ctx         = ctx,
+            .task        = task,
+            .reorderable = reorderable,
+        };
+        try compo.taskcard.gui(@src(), &subctx);
+    }
+}
+
+fn TaskCardCtx(T: type) type {
+    return struct {
+        const Self = @This();
+
+        ctx : T,
+        task: Task,
+        reorderable: *dvui.Reorderable,
+
+        pub fn open(self: *Self) void {
+            _ = self;
+            std.debug.print("OPEN\n", .{});
+        }
+        pub fn startDragging(self: *Self, p: dvui.Point) void {
+            self.reorderable.reorder.dragStart(self.reorderable.data().id, p);
+        }
+
+        pub fn id(self: *const Self) usize {
+            return self.task.id;
+        }
+        pub fn summary(self: *const Self) []const u8 {
+            return self.task.summary;
+        }
+        pub fn done(self: *const Self) bool {
+            return self.task.done;
+        }
+        pub fn staged(_: *const Self) bool {
+            return true;
+        }
+        pub fn archived(_: *const Self) bool {
+            return false;
+        }
+    };
+}
+
+pub const Mock = struct {
+    const Self     = @This();
+    const TaskList = std.ArrayList(Task);
+
+    tasks: TaskList,
+
+    pub fn init(alloc: std.mem.Allocator) !Self {
+        var tasks = TaskList.init(alloc);
+        errdefer tasks.deinit();
+
+        for (0..100) |id| {
+            try tasks.append(Task { .id = id*2, .summary = "helloworld", .done = true, });
+            try tasks.append(Task { .id = id*2+1, .summary = "goodbye", .done = false, });
+        }
+
+        return Mock {
+            .tasks = tasks,
+        };
+    }
+    pub fn deinit(self: *Self) void {
+        self.tasks.deinit();
+    }
+
+    pub fn mark(self: *Self, idx: usize, check: bool) void {
+        self.tasks.items[idx].done = check;
+    }
+    pub fn get_tasks(self: *const Self) []const Task {
+        return self.tasks.items;
+    }
+};

src/heavens-net/compo/taskcard.zig

@@ -0,0 +1,185 @@
+const std  = @import("std");
+const dvui = @import("dvui");
+
+const ui = @import("../ui/root.zig");
+
+pub fn gui(src: std.builtin.SourceLocation, ctx: anytype) !void {
+    var card = try dvui.box(src, .horizontal, .{
+        .id_extra   = ctx.id(),
+        .expand     = .horizontal,
+        .background = true,
+        .border     = dvui.Rect.all(1),
+    });
+    defer card.deinit();
+
+    {
+        var check = ctx.done();
+        const changed = try dvui.checkbox(@src(), &check, null, .{
+            .gravity_y = 0.5,
+            .gravity_x = 0,
+        });
+        if (changed) {
+            std.debug.print("CHANGED\n", .{});
+        }
+    }
+
+    const hover = true;
+    if (hover) {
+        var icons = try dvui.box(@src(), .horizontal, .{
+            .expand    = .vertical,
+            .gravity_x = 1,
+        });
+        defer icons.deinit();
+
+        if (ctx.staged()) {
+            if (try buttonIcon(@src(), "unstage", dvui.entypo.light_down)) {
+                std.debug.print("UNSTAGE\n", .{});
+            }
+        } else {
+            if (try buttonIcon(@src(), "stage", dvui.entypo.light_up)) {
+                std.debug.print("STAGE\n", .{});
+            }
+        }
+        if (ctx.archived()) {
+            if (try buttonIcon(@src(), "unarchive", dvui.entypo.back_in_time)) {
+                std.debug.print("UNARCHIVE\n", .{});
+            }
+        } else {
+            if (try buttonIcon(@src(), "archive", dvui.entypo.archive)) {
+                std.debug.print("ARCHIVE\n", .{});
+            }
+        }
+    }
+
+    const rc = try title(ctx, card.data().rectScale().r.topLeft());
+
+    // dragging link
+    if (!@hasDecl(@TypeOf(ctx.*), "startDragging")) {
+        // WIP
+        // dvui.pathStroke([_]dvui.Point{rc.topLeft(), cw.});
+    }
+}
+
+fn buttonIcon(src: std.builtin.SourceLocation, name: []const u8, icon: []const u8) !bool {
+    return try dvui.buttonIcon(src, name, icon, .{}, .{
+        .margin    = dvui.Rect.all(0),
+        .padding   = dvui.Rect.all(4),
+        .gravity_y = 0.5,
+    });
+}
+
+fn title(ctx: anytype, topLeft: dvui.Point) !dvui.Rect {
+    // this codes are based on dvui.labelClick
+
+    var lw = dvui.LabelWidget.init(@src(), "#{d} {s}", .{ctx.id(), ctx.summary()}, .{
+        .expand    = .horizontal,
+        .gravity_x = 0,
+        .name      = "LabelClick"
+    });
+    // now lw has a Rect from its parent but hasn't processed events or drawn
+
+    const lwid = lw.data().id;
+
+    // if lw is visible, we want to be able to keyboard navigate to it
+    if (lw.data().visible()) {
+        try dvui.tabIndexSet(lwid, lw.data().options.tab_index);
+    }
+
+    // draw border and background
+    try lw.install();
+
+    // loop over all events this frame in order of arrival
+    for (dvui.events()) |*e| {
+
+        // skip if lw would not normally process this event
+        if (!lw.matchEvent(e))
+            continue;
+
+        switch (e.evt) {
+            .mouse => |me| {
+                if (me.action == .focus) {
+                    e.handled = true;
+
+                    // focus this widget for events after this one (starting with e.num)
+                    dvui.focusWidget(lwid, null, e.num);
+                } else if (me.action == .press and me.button.pointer()) {
+                    e.handled = true;
+                    dvui.captureMouse(lwid);
+
+                    // for touch events, we want to cancel our click if a drag is started
+                    dvui.dragPreStart(me.p, .{ .name = "TASK", .offset = topLeft.diff(me.p), });
+                } else if (me.action == .release and me.button.pointer()) {
+                    // mouse button was released, do we still have mouse capture?
+                    if (dvui.captured(lwid)) {
+                        e.handled = true;
+
+                        // cancel our capture
+                        dvui.captureMouse(null);
+                        dvui.dragEnd();
+
+                        // if the release was within our border, the click is successful
+                        if (lw.data().borderRectScale().r.contains(me.p)) {
+                            ctx.open();
+
+                            // if the user interacts successfully with a
+                            // widget, it usually means part of the GUI is
+                            // changing, so the convention is to call refresh
+                            // so the user doesn't have to remember
+                            dvui.refresh(null, @src(), lwid);
+                        }
+                    }
+                } else if (me.action == .motion) {
+                    if (me.button.touch()) {
+                        if (dvui.captured(lwid)) {
+                            if (dvui.dragging(me.p)) |_| {
+                                // touch: if we overcame the drag threshold, then
+                                // that means the person probably didn't want to
+                                // touch this button, they were trying to scroll
+                                dvui.captureMouse(null);
+                                dvui.dragEnd();
+                            }
+                        }
+                    } else if (@hasDecl(@TypeOf(ctx.*), "startDragging")) {
+                        // call ctx.startDragging if the method exists
+                        if (dvui.captured(lwid)) {
+                            e.handled = true;
+                            if (dvui.dragging(me.p)) |_| {
+                                ctx.startDragging(me.p);
+                            }
+                        }
+                    }
+                } else if (me.action == .position) {
+                    // a single .position mouse event is at the end of each
+                    // frame, so this means the mouse ended above us
+                    dvui.cursorSet(.hand);
+                }
+            },
+            .key => |ke| {
+                if (ke.action == .down and ke.matchBind("activate")) {
+                    e.handled = true;
+                    ctx.open();
+                    dvui.refresh(null, @src(), lwid);
+                }
+            },
+            else => {},
+        }
+
+        // if we didn't handle this event, send it to lw - this means we don't
+        // need to call lw.processEvents()
+        if (!e.handled) {
+            lw.processEvent(e, false);
+        }
+    }
+
+    // draw text
+    try lw.draw();
+
+    // draw an accent border if we are focused
+    if (lwid == dvui.focusedWidgetId()) {
+        try lw.data().focusBorder();
+    }
+
+    // done with lw, have it report min size to parent
+    defer lw.deinit();
+    return lw.data().scaleRect().r;
+}

src/heavens-net/compo/taskedit.zig

@@ -0,0 +1,158 @@
+const std  = @import("std");
+const dvui = @import("dvui");
+
+const ui = @import("../ui/root.zig");
+
+pub const Tab = enum {
+    info,
+    detail,
+    network,
+    gantt,
+};
+
+pub fn gui(ctx: anytype) !void {
+    var win = try dvui.floatingWindow(@src(), .{}, .{});
+    defer win.deinit();
+
+    // window header
+    {
+        var buf: [128]u8 = undefined;
+        const subtitle = std.fmt.bufPrint(&buf, "#{d}", .{ctx.taskId()}) catch unreachable;
+        try dvui.windowHeader("Task", subtitle, null);
+    }
+
+    // task summary
+    {
+        var hbox = try dvui.box(@src(), .horizontal, .{ .expand = .horizontal, });
+        defer hbox.deinit();
+
+        var mark: bool = false;
+        if (try dvui.checkbox(@src(), &mark, null, .{ .gravity_y = 0.5, })) {
+        }
+
+        var summary = try dvui.textEntry(@src(), .{}, .{
+            .expand = .horizontal,
+        });
+        defer summary.deinit();
+    }
+
+    // tabs
+    {
+        const shown = ctx.shownTab();
+
+        var tbox = try dvui.box(@src(), .vertical, .{ .expand = .both, });
+        defer tbox.deinit();
+
+        {
+            var tabs = dvui.TabsWidget.init(@src(), .{ .dir = .horizontal }, .{
+                .expand = .horizontal,
+            });
+            try tabs.install();
+            defer tabs.deinit();
+
+            inline for (std.meta.fields(Tab)) |tabMeta| {
+                const tab = @field(Tab, tabMeta.name);
+                if (try tabs.addTabLabel(shown == tab, tabMeta.name)) {
+                    ctx.switchTab(tab);
+                }
+            }
+        }
+
+        var vbox = try dvui.box(@src(), .vertical, .{ .expand = .both, });
+        defer vbox.deinit();
+
+        switch (shown) {
+            .info   => try tabInfo(ctx),
+            .detail => try tabDetail(ctx),
+            else    => try dvui.labelNoFmt(@src(), "NOT IMPLEMENTED YET :(", .{
+                .gravity_x = 0.5,
+                .gravity_y = 0.5,
+            }),
+        }
+    }
+}
+
+fn tabInfo(ctx: anytype) !void {
+    _ = ctx;
+
+    var vbox = try dvui.box(@src(), .vertical, .{ .expand = .both, });
+    defer vbox.deinit();
+
+    const fields = [_][:0]const u8 {"foo", "baz", "bar"};
+    for (0.., fields) |idx, name| {
+        var hbox = try dvui.box(@src(), .horizontal, .{
+            .id_extra = idx,
+            .expand   = .horizontal,
+        });
+        defer hbox.deinit();
+
+        {
+            var box = try dvui.box(@src(), .horizontal, .{
+                .min_size_content = .{ .w = 64, .h = 0, },
+            });
+            defer box.deinit();
+            try dvui.label(@src(), "{s}", .{name}, .{
+                .gravity_x = 1,
+            });
+        }
+        {
+            var box = try dvui.box(@src(), .horizontal, .{
+                .expand = .horizontal,
+            });
+            defer box.deinit();
+            try dvui.labelNoFmt(@src(), "this is a field value", .{});
+        }
+    }
+}
+
+fn tabDetail(ctx: anytype) !void {
+    _ = ctx;
+    // const task = ctx.task();
+
+    var vbox = try dvui.box(@src(), .vertical, .{ .expand = .both, });
+    defer vbox.deinit();
+
+    // detail
+    {
+        var detail = try dvui.textEntry(@src(), .{
+            .break_lines       = true,
+            .scroll_vertical   = true,
+            .scroll_horizontal = true,
+            .multiline         = true,
+        }, .{
+            .expand = .both,
+        });
+        defer detail.deinit();
+    }
+}
+
+pub const Mock = struct {
+    const Self = @This();
+
+    _taskId: usize,
+    _summary: []const u8,
+
+    _shownTab: Tab,
+
+    pub fn init(alloc: std.mem.Allocator) !Self {
+        _ = alloc;
+        return Mock {
+            ._taskId = 0,
+            ._summary = "hello",
+            ._shownTab = .info,
+        };
+    }
+    pub fn deinit(self: *Self) void {
+        _ = self;
+    }
+
+    fn switchTab(self: *Self, tab: Tab) void {
+        self._shownTab = tab;
+    }
+
+    fn taskId(self: *const Self) usize { return self._taskId; }
+    fn summary(self: *const Self) []const u8 { return self._summary; }
+
+    fn shownTab(self: *const Self) Tab { return self._shownTab; }
+};
+

src/heavens-net/ui/event.zig

@@ -0,0 +1,30 @@
+const dvui = @import("dvui");
+
+pub fn key(bind: []const u8) ?*dvui.Event {
+    for (dvui.events()) |*e| {
+        if (e.evt == .key) {
+            if (e.evt.key.matchBind(bind)) {
+                return e;
+            }
+        }
+    }
+    return null;
+}
+pub fn keyDown(bind: []const u8) bool {
+    return if (key(bind)) |e| e.evt.key.action == .down else false;
+}
+pub fn keyPress(bind: []const u8) bool {
+    return if (key(bind)) |e| (e.evt.key.action == .down or e.evt.key.action == .repeat) else false;
+}
+pub fn keyUp(bind: []const u8) bool {
+    return if (key(bind)) |e| e.evt.key.action == .up else false;
+}
+
+pub fn mouse(action: dvui.Event.Mouse.Action, button: dvui.enums.Button) ?*dvui.Event {
+    for (dvui.events()) |*e| {
+        if (e.evt == .mouse and e.evt.mouse.action == action and e.evt.mouse.button == button) {
+            return e;
+        }
+    }
+    return null;
+}

src/heavens-net/ui/root.zig

@@ -0,0 +1 @@
+pub const event = @import("./event.zig");

src/heavens-net/win/root.zig

@@ -1 +0,0 @@
-pub const today = @import("./today.zig");

src/heavens-net/win/today.zig

@@ -1,88 +0,0 @@
-const std  = @import("std");
-const dvui = @import("dvui");
-
-pub const Task = struct {
-    name: [:0]const u8,
-    mark: bool,
-};
-
-pub fn gui(ctx: anytype) !void {
-    var win = try dvui.floatingWindow(@src(), .{}, .{});
-    defer win.deinit();
-
-    try dvui.windowHeader("Today", "", null);
-
-    var scrollArea = try dvui.scrollArea(@src(), .{}, .{
-        .expand = .both,
-    });
-    defer scrollArea.deinit();
-
-    var reorder = try dvui.reorder(@src(), .{
-        .background = true,
-        .expand     = .both,
-    });
-    defer reorder.deinit();
-
-    var list = try dvui.box(@src(), .vertical, .{ .expand = .both, });
-    defer list.deinit();
-
-    const tasks = ctx.get_tasks();
-    for (0.., tasks) |idx, task| {
-        var reorderable = try reorder.reorderable(@src(), .{}, .{
-            .id_extra = idx,
-            .expand   = .horizontal,
-        });
-        defer reorderable.deinit();
-
-        var hbox = try dvui.box(@src(), .horizontal, .{
-            .expand     = .both,
-            .background = true,
-            .border     = dvui.Rect.all(1),
-        });
-        defer hbox.deinit();
-
-        var mark: bool = task.mark;
-        if (try dvui.checkbox(@src(), &mark, null, .{})) {
-            ctx.mark(idx, mark);
-        }
-
-        try dvui.label(@src(), "{s}", .{ task.name, }, .{});
-
-        _ = try dvui.ReorderWidget.draggable(@src(), .{ .reorderable = reorderable, }, .{
-            .expand      = .vertical,
-            .gravity_x   = 1.0,
-            .gravity_y   = 0.5,
-        });
-    }
-
-    try dvui.labelNoFmt(@src(), "no tasks anymore :)", .{ .gravity_x = 0.5 });
-}
-
-pub const Mock = struct {
-    const Self     = @This();
-    const TaskList = std.ArrayList(Task);
-
-    tasks: TaskList,
-
-    pub fn init(alloc: std.mem.Allocator) !Self {
-        var tasks = TaskList.init(alloc);
-        errdefer tasks.deinit();
-
-        try tasks.append(Task { .name = "helloworld", .mark = true, });
-        try tasks.append(Task { .name = "goodbye", .mark = false, });
-
-        return Mock {
-            .tasks = tasks,
-        };
-    }
-    pub fn deinit(self: *Self) void {
-        self.tasks.deinit();
-    }
-
-    fn mark(self: *Self, idx: usize, check: bool) void {
-        self.tasks.items[idx].mark = check;
-    }
-    fn get_tasks(self: *const Self) []const Task {
-        return self.tasks.items;
-    }
-};

src/hncore/CommandHistory.zig

@@ -0,0 +1,134 @@
+const std = @import("std");
+
+const CommandIF = @import("./command/root.zig").Interface;
+
+///
+const Self = @This();
+
+///
+const CommandList = std.ArrayList(CommandIF);
+
+///
+commands: CommandList,
+
+/// next command to be applied by redoing
+head: usize,
+
+///
+pub fn init(alloc: std.mem.Allocator) Self {
+    return Self {
+        .commands = CommandList.init(alloc),
+        .head     = 0,
+    };
+}
+
+///
+pub fn deinit(self: *Self) void {
+    for (self.commands.items) |*command| {
+        command.deinit();
+    }
+    self.commands.deinit();
+}
+
+///
+pub fn exec(self: *Self, command: CommandIF) !void {
+    if (self.head >= self.commands.items.len) {
+        try self.commands.append(command);
+    } else {
+        try self.commands.resize(self.head + 1);
+        self.commands.items[self.head] = command;
+    }
+    errdefer _ = self.commands.pop();
+
+    self.head = self.commands.items.len;
+    try command.apply();
+}
+
+///
+pub fn undo(self: *Self) !void {
+    if (self.head == 0) {
+        return error.NoCommand;
+    }
+    self.head -= 1;
+    errdefer self.head += 1;
+
+    try self.commands.items[self.head].revert();
+}
+
+///
+pub fn redo(self: *Self) !void {
+    if (self.head >= self.commands.items.len) {
+        return error.NoCommand;
+    }
+    try self.commands.items[self.head].apply();
+    self.head += 1;
+}
+
+///
+pub fn isUndoAvailable(self: *const Self) bool {
+    return self.head > 0;
+}
+///
+pub fn isRedoAvailable(self: *const Self) bool {
+    return self.head < self.commands.items.len;
+}
+
+test {
+    var value1: i32 = 0;
+    var value2: i32 = 0;
+
+    var history = init(std.testing.allocator);
+    defer history.deinit();
+
+    try std.testing.expectEqual(false, history.isUndoAvailable());
+    try std.testing.expectEqual(false, history.isRedoAvailable());
+    try std.testing.expectError(error.NoCommand, history.undo());
+    try std.testing.expectError(error.NoCommand, history.redo());
+
+    try history.exec(
+        try CommandIF.make(std.testing.allocator, CommandIF.Mock { .target = &value1, }));
+    try std.testing.expectEqual(history.isUndoAvailable(), true);
+    try std.testing.expectEqual(history.isRedoAvailable(), false);
+    try std.testing.expectEqual(value1, 1);
+
+    try history.undo();
+    try std.testing.expectEqual(history.isUndoAvailable(), false);
+    try std.testing.expectEqual(history.isRedoAvailable(), true);
+    try std.testing.expectEqual(value1, 0);
+
+    try history.redo();
+    try std.testing.expectEqual(history.isUndoAvailable(), true);
+    try std.testing.expectEqual(history.isRedoAvailable(), false);
+    try std.testing.expectEqual(value1, 1);
+
+    try history.exec(
+        try CommandIF.make(std.testing.allocator, CommandIF.Mock { .target = &value2, }));
+    try std.testing.expectEqual(history.isUndoAvailable(), true);
+    try std.testing.expectEqual(history.isRedoAvailable(), false);
+    try std.testing.expectEqual(value1, 1);
+    try std.testing.expectEqual(value2, 1);
+
+    try history.undo();
+    try std.testing.expectEqual(history.isUndoAvailable(), true);
+    try std.testing.expectEqual(history.isRedoAvailable(), true);
+    try std.testing.expectEqual(value1, 1);
+    try std.testing.expectEqual(value2, 0);
+
+    try history.redo();
+    try std.testing.expectEqual(history.isUndoAvailable(), true);
+    try std.testing.expectEqual(history.isRedoAvailable(), false);
+    try std.testing.expectEqual(value1, 1);
+    try std.testing.expectEqual(value2, 1);
+
+    try history.undo();
+    try std.testing.expectEqual(history.isUndoAvailable(), true);
+    try std.testing.expectEqual(history.isRedoAvailable(), true);
+    try std.testing.expectEqual(value1, 1);
+    try std.testing.expectEqual(value2, 0);
+
+    try history.undo();
+    try std.testing.expectEqual(history.isUndoAvailable(), false);
+    try std.testing.expectEqual(history.isRedoAvailable(), true);
+    try std.testing.expectEqual(value1, 0);
+    try std.testing.expectEqual(value2, 0);
+}

src/hncore/Task.zig

@@ -0,0 +1,69 @@
+const std = @import("std");
+
+const Self = @This();
+
+///
+alloc: std.mem.Allocator,
+
+///
+id: usize,
+
+///
+summary: [:0]const u8,
+
+///
+details: [:0]const u8,
+
+///
+done: bool,
+
+///
+archived: bool,
+
+///
+pub fn init(alloc: std.mem.Allocator, id: usize) !Self {
+    return Self {
+        .alloc    = alloc,
+        .id       = id,
+        .summary  = try alloc.dupeZ(u8, ""),
+        .details  = try alloc.dupeZ(u8, ""),
+        .done     = true,
+        .archived = true,
+    };
+}
+///
+pub fn deinit(self: *Self) void {
+    self.alloc.free(self.details);
+    self.alloc.free(self.summary);
+}
+
+///
+pub fn setSummary(self: *Self, v: []const u8) !void {
+    self.alloc.free(self.summary);
+    self.summary = try self.alloc.dupeZ(u8, v);
+}
+///
+pub fn setDetails(self: *Self, v: []const u8) !void {
+    self.alloc.free(self.details);
+    self.details = try self.alloc.dupeZ(u8, v);
+}
+
+test {
+    var task = try init(std.testing.allocator, 0);
+    defer task.deinit();
+    try std.testing.expectEqual(task.id, 0);
+    try std.testing.expectEqualStrings("", task.summary);
+    try std.testing.expectEqualStrings("", task.details);
+
+    try task.setSummary("helloworld");
+    try std.testing.expectEqualStrings("helloworld", task.summary);
+    try std.testing.expectEqualStrings("", task.details);
+
+    try task.setDetails("good afternoon");
+    try std.testing.expectEqualStrings("helloworld", task.summary);
+    try std.testing.expectEqualStrings("good afternoon", task.details);
+
+    try task.setSummary("goodbye");
+    try std.testing.expectEqualStrings("goodbye", task.summary);
+    try std.testing.expectEqualStrings("good afternoon", task.details);
+}

src/hncore/TaskStore.zig

@@ -0,0 +1,59 @@
+const std = @import("std");
+
+const Task = @import("./Task.zig");
+
+const Self = @This();
+const Map  = std.AutoHashMap(usize, *Task);
+
+alloc: std.mem.Allocator,
+map: Map,
+nextId: usize,
+
+///
+pub fn init(alloc: std.mem.Allocator) Self {
+    return Self {
+        .alloc  = alloc,
+        .map    = Map.init(alloc),
+        .nextId = 0,
+    };
+}
+///
+pub fn deinit(self: *Self) void {
+    var itr = self.map.valueIterator();
+    while (itr.next()) |task| {
+        task.*.deinit();
+        self.alloc.destroy(task.*);
+    }
+    self.map.deinit();
+}
+///
+pub fn add(self: *Self) !*Task {
+    var task = try self.alloc.create(Task);
+    errdefer self.alloc.destroy(task);
+
+    task.* = try Task.init(self.alloc, self.nextId);
+    errdefer task.deinit();
+
+    try self.map.putNoClobber(task.id, task);
+
+    self.nextId += 1;
+    return task;
+}
+///
+pub fn query(self: *const Self, id: usize) !*Task {
+    return self.map.get(id) orelse error.NotFound;
+}
+
+test {
+    var store = init(std.testing.allocator);
+    defer store.deinit();
+
+    const task1 = try store.add();
+    const task2 = try store.add();
+
+    try std.testing.expect(task1.id != task2.id);
+
+    try std.testing.expectEqual(task1, store.query(task1.id));
+    try std.testing.expectEqual(task2, store.query(task2.id));
+    try std.testing.expectError(error.NotFound, store.query(1234));
+}

src/hncore/Workspace.zig

@@ -0,0 +1,23 @@
+const std = @import("std");
+
+const CommandHistory = @import("./CommandHistory.zig");
+const TaskStore      = @import("./TaskStore.zig");
+
+const Self = @This();
+
+tasks: TaskStore,
+commands: CommandHistory,
+
+pub fn init(allocator: std.mem.Allocator) Self {
+    return Self {
+        .commands = CommandHistory.init(allocator),
+        .tasks    = TaskStore.init(allocator),
+    };
+}
+pub fn deinit(self: *Self) void {
+    self.tasks.deinit();
+}
+test {
+    var ws = init(std.testing.allocator);
+    defer ws.deinit();
+}

src/hncore/command/Interface.zig

@@ -0,0 +1,134 @@
+//!
+
+const std = @import("std");
+
+///
+pub const Self  = @This();
+
+///
+pub const Error = error {
+    ///
+    OutOfMemory,
+
+    ///
+    InvalidState,
+
+    ///
+    Unknown,
+};
+
+///
+pub const VTable = struct {
+    ///
+    deinit: *const fn(ctx: *anyopaque) void,
+
+    ///
+    apply: *const fn(ctx: *anyopaque) Error!void,
+
+    ///
+    revert: *const fn(ctx: *anyopaque) Error!void,
+};
+
+///
+pub const Mock = struct {
+    target   : ?*i32  = null,
+    destroyed: ?*bool = null,
+
+    pub fn deinit(self: *@This(), _: anytype) void {
+        if (self.destroyed) |ptr| {
+            ptr.* = true;
+        }
+    }
+    pub fn apply(self: *@This(), _: anytype) !void {
+        if (self.target) |ptr| {
+            ptr.* += 1;
+        }
+    }
+    pub fn revert(self: *@This(), _: anytype) !void {
+        if (self.target) |ptr| {
+            ptr.* -= 1;
+        }
+    }
+};
+
+///
+ctx: *anyopaque,
+
+///
+vtable: *const VTable,
+
+///
+pub fn deinit(self: Self) void {
+    self.vtable.deinit(self.ctx);
+}
+
+///
+pub fn apply(self: Self) !void {
+    return self.vtable.apply(self.ctx);
+}
+
+///
+pub fn revert(self: Self) !void {
+    return self.vtable.revert(self.ctx);
+}
+
+///
+pub fn make(alloc: std.mem.Allocator, ctx: anytype) !Self {
+    const Target = @TypeOf(ctx);
+    const Wrapper = struct {
+        const vtable = VTable {
+            .deinit = @This().del,
+            .apply  = @This().apply,
+            .revert = @This().revert,
+        };
+
+        alloc: std.mem.Allocator,
+        ctx  : Target,
+
+        fn new(alloc2: std.mem.Allocator, ctx2: Target) !*@This() {
+            const self = try alloc2.create(@This());
+            self.* = .{
+                .alloc = alloc2,
+                .ctx   = ctx2,
+            };
+            return self;
+        }
+        fn del(selfp: *anyopaque) void {
+            const self: *@This() = @ptrCast(@alignCast(selfp));
+            self.ctx.deinit(self.alloc);
+            self.alloc.destroy(self);
+        }
+        fn apply(selfp: *anyopaque) Error!void {
+            const self: *@This() = @ptrCast(@alignCast(selfp));
+            return self.ctx.apply(self.alloc);
+        }
+        fn revert(selfp: *anyopaque) Error!void {
+            const self: *@This() = @ptrCast(@alignCast(selfp));
+            return self.ctx.revert(self.alloc);
+        }
+    };
+    return Self {
+        .ctx    = try Wrapper.new(alloc, ctx),
+        .vtable = &Wrapper.vtable,
+    };
+}
+
+test {
+    var value: i32 = 0;
+    var destroyed = false;
+    {
+        const cmd = try Self.make(std.testing.allocator, Mock {
+            .target    = &value,
+            .destroyed = &destroyed,
+        });
+        defer cmd.deinit();
+
+        try cmd.apply();
+        try std.testing.expectEqual(value, 1);
+
+        try cmd.revert();
+        try std.testing.expectEqual(value, 0);
+    }
+
+    try std.testing.expect(destroyed);
+}

src/hncore/command/root.zig

@@ -0,0 +1,7 @@
+pub const Interface = @import("./Interface.zig");
+
+pub const task = @import("./task.zig");
+
+test {
+    @import("std").testing.refAllDecls(@This());
+}

src/hncore/command/task.zig

@@ -0,0 +1,67 @@
+const std = @import("std");
+
+const Interface = @import("./Interface.zig");
+
+const Task = @import("../Task.zig");
+
+///
+const SetSummary = struct {
+    ///
+    const Self = @This();
+
+    ///
+    target: *Task,
+
+    ///
+    summary: [:0]const u8,
+
+    ///
+    pub fn init(alloc: std.mem.Allocator, task: *Task, summary: []const u8) !Interface {
+        const summaryDup = try alloc.dupeZ(u8, summary);
+        errdefer alloc.free(summaryDup);
+        return try Interface.make(alloc, Self {
+            .target  = task,
+            .summary = summaryDup,
+        });
+    }
+
+    ///
+    pub fn deinit(self: *Self, alloc: std.mem.Allocator) void {
+        alloc.free(self.summary);
+    }
+
+    ///
+    pub fn apply(self: *Self, alloc: std.mem.Allocator) Interface.Error!void {
+        const old = try alloc.dupeZ(u8, self.target.summary);
+        errdefer alloc.free(old);
+
+        try self.target.setSummary(self.summary);
+        alloc.free(self.summary);
+
+        self.summary = old;
+    }
+
+    ///
+    pub fn revert(self: *Self, alloc: std.mem.Allocator) Interface.Error!void {
+        return self.apply(alloc);
+    }
+};
+
+test {
+    const TaskStore = @import("../TaskStore.zig");
+
+    var tasks = TaskStore.init(std.testing.allocator);
+    defer tasks.deinit();
+
+    var task = try tasks.add();
+    try task.setSummary("helloworld");
+
+    var sut = try SetSummary.init(std.testing.allocator, task, "goodbye");
+    defer sut.deinit();
+
+    try sut.apply();
+    try std.testing.expectEqualStrings("goodbye", task.summary);
+
+    try sut.revert();
+    try std.testing.expectEqualStrings("helloworld", task.summary);
+}

src/hncore/root.zig

@@ -1,3 +1,10 @@
+pub const command = @import("./command/root.zig");
+
+pub const CommandHistory = @import("./CommandHistory.zig");
+pub const Task           = @import("./Task.zig");
+pub const TaskStore      = @import("./TaskStore.zig");
+pub const Workspace      = @import("./Workspace.zig");
+
 test {
     @import("std").testing.refAllDecls(@This());
 }