Add handler to panic on SIGSEGV to restore terminal to original state

justfile

@@ -2,8 +2,9 @@ build OPTIMIZE="Debug":
     zig build -Doptimize={{OPTIMIZE}}
 
 run OPTIMIZE="Debug": (build OPTIMIZE)
+    -rm panes.log
     ./zig-out/bin/panes
-    cat panes.log
+    -cat panes.log
 
 debug: (build "Debug")
     gdb ./zig-out/bin/panes

src/log.zig

@@ -25,6 +25,7 @@ pub fn setLevel(level: Level) void {
 pub fn deinit() void {
     if (writer) |w| {
         w.context.close();
+        writer = null;
     }
 }
 

src/main.zig

@@ -39,7 +39,9 @@ fn on_select(item: usize) void {
 }
 
 pub fn main() !void {
+    if (@import("builtin").mode == .Debug) {
         try log.init("panes.log", .Debug);
+    }
     defer log.deinit();
 
     const stdin = std.io.getStdIn().reader();
@@ -53,9 +55,16 @@ pub fn main() !void {
     var lineV: line.VerticalLine = undefined;
     var lineH: line.HorizontalLine = undefined;
 
+    var target: tabs.TabbedTarget = undefined;
+    var child1: stack.Stack = undefined;
+    var child2: btn.Button = undefined;
+    var child3: btn.Button = undefined;
+    var child4: btn.Button = undefined;
+    var child5: btn.Button = undefined;
+
     var items = [_]menu.MenuItem{ .{ .name = "Item 1" }, .{ .name = "Item ab" } };
     var items2 = [_]menu.MenuItem{ .{ .name = "Item 1" }, .{ .name = "Item ab" } };
-    var tabs_ = [_]tabs.Tab{ .{ .name = "Tab 1", .pane = &side_menu.pane }, .{ .name = "Tab 2", .pane = &child.pane }, .{ .name = "Tab 3", .pane = &child.pane }, .{ .name = "Tab 4", .pane = &child.pane }, .{ .name = "Tab 5", .pane = &child.pane } };
+    var tabs_ = [_]tabs.Tab{ .{ .name = "Tab 1", .pane = &child1.pane }, .{ .name = "Tab 2", .pane = &child2.pane }, .{ .name = "Tab 3", .pane = &child3.pane }, .{ .name = "Tab 4", .pane = &child4.pane }, .{ .name = "Tab 5", .pane = &child5.pane } };
 
     const gray = color.RGB(80, 80, 80);
     const green = color.RGB(0, 255, 0);
@@ -67,28 +76,45 @@ pub fn main() !void {
             .pane = menu.Menu.create(&side_menu, .{ .title = "Menu", .style = s, .align_text = .Center, .expand_highlight = true, .on_select = on_side_select }, &items2),
             .dimensions = .{ .width = .{ .type = .Fill, .value = 1 }, .height = .{ .type = .Fill, .value = 100 } },
         },
-        .{ .pane = line.VerticalLine.create(&lineV, .{ .border = borders.BoldBorder, .style = s }), .dimensions = .{ .width = .{ .type = .Absolute, .value = 1 }, .height = .{ .type = .Fill, .value = 100 } } },
+        .{
+            .pane = line.VerticalLine.create(&lineV, .{ .border = borders.BoldBorder, .style = s }),
+            .dimensions = .{ .width = .{ .type = .Absolute, .value = 1 }, .height = .{ .type = .Fill, .value = 100 } },
+        },
         .{
             .pane = stack.Stack.create(&child, .{ .direction = .Vertical, .style = s }, &[_]stack.StackedPane{
                 .{
-                    .pane = tabs.TabBar.create(&tabbar, .{ .style = s, .highlight_color = green }, &tabs_),
+                    .pane = tabs.TabBar.create(&tabbar, .{ .target = &target, .style = s, .highlight_color = green }, &tabs_),
                     .dimensions = .{ .width = .{ .type = .Fill, .value = 100 }, .height = .{ .type = .Absolute, .value = 1 } },
                 },
                 .{
-                    .pane = menu.Menu.create(&m, .{ .title = "Test", .style = s, .align_text = .Left, .expand_highlight = true, .on_select = on_select }, &items),
+                    .pane = tabs.TabbedTarget.create(&target, s),
                     .dimensions = .{ .width = .{ .type = .Fill, .value = 100 }, .height = .{ .type = .Fill, .value = 1 } },
                 },
-                .{ .pane = line.HorizontalLine.create(&lineH, .{ .border = borders.BoldBorder, .style = s }), .dimensions = .{ .width = .{ .type = .Fill, .value = 100 }, .height = .{ .type = .Absolute, .value = 1 } } },
-                .{
-                    .pane = btn.Button.create(&button, .{ .text = "<Button>", .style = s, .callback = on_click }),
-                    .dimensions = .{ .width = .{ .type = .Absolute, .value = 8 }, .height = .{ .type = .Absolute, .value = 1 } },
-                },
             }),
             .dimensions = .{ .width = .{ .type = .Fill, .value = 9 }, .height = .{ .type = .Fill, .value = 100 } },
         },
     });
 
-    pane.set_layout(&top.pane, &m.pane);
+    _ = btn.Button.create(&child2, .{ .text = "Page 2", .callback = on_click, .style = s });
+    _ = btn.Button.create(&child3, .{ .text = "Page 3", .callback = on_click, .style = s });
+    _ = btn.Button.create(&child4, .{ .text = "Page 4", .callback = on_click, .style = s });
+    _ = btn.Button.create(&child5, .{ .text = "Page 5", .callback = on_click, .style = s });
+    _ = stack.Stack.create(&child1, .{ .direction = .Vertical, .style = s }, &[_]stack.StackedPane{
+        .{
+            .pane = menu.Menu.create(&m, .{ .title = "Test", .style = s, .align_text = .Left, .expand_highlight = true, .on_select = on_select }, &items),
+            .dimensions = .{ .width = .{ .type = .Fill, .value = 100 }, .height = .{ .type = .Fill, .value = 1 } },
+        },
+        .{
+            .pane = line.HorizontalLine.create(&lineH, .{ .border = borders.BoldBorder, .style = s }),
+            .dimensions = .{ .width = .{ .type = .Fill, .value = 100 }, .height = .{ .type = .Absolute, .value = 1 } },
+        },
+        .{
+            .pane = btn.Button.create(&button, .{ .text = "<Button>", .style = s, .callback = on_click }),
+            .dimensions = .{ .width = .{ .type = .Absolute, .value = 8 }, .height = .{ .type = .Absolute, .value = 1 } },
+        },
+    });
+
+    pane.set_layout(&top.pane, &tabbar.pane);
     try pane.init(&term_io);
     defer pane.cleanup(&term_io);
 

src/pane.zig

@@ -29,6 +29,10 @@ fn exit_signal(_: i32) callconv(.C) void {
     should_exit.store(true, .release);
 }
 
+fn panic_signal(_: i32) callconv(.C) void {
+    @panic("Segmentation fault!!");
+}
+
 pub fn set_layout(layout: *Pane, initial_focus: *Pane) void {
     layout.parent = &window.pane;
     window.child = layout;
@@ -51,6 +55,13 @@ pub fn init(term_io: *TermIO) !void {
     };
     try std.posix.sigaction(std.posix.SIG.INT, &exit_handler, null);
 
+    var panic_handler = std.posix.Sigaction{
+        .handler = .{ .handler = panic_signal },
+        .mask = std.posix.empty_sigset,
+        .flags = 0,
+    };
+    try std.posix.sigaction(std.posix.SIG.SEGV, &panic_handler, null);
+
     term_io.enterRawMode();
     term_io.saveScreen();
     term_io.hideCursor();
@@ -259,14 +270,18 @@ pub const Pane = struct {
         self.vtable.resize(self);
     }
 
-    pub fn draw(self: *Pane, term_io: *TermIO) !void {
+    pub fn clear(self: *Pane, term_io: *TermIO) !void {
         if (self.style.border) |border| {
             term_io.setColor(self.style.background, self.style.foreground);
             try term_io.drawBox(self.dimensions, border, !self.style.background.equal(self.parent.style.background));
-        } else if (!self.style.background.equal(self.parent.style.background)) {
+        } else {
             term_io.setColor(self.style.background, self.style.foreground);
             term_io.fillBox(self.dimensions);
         }
+    }
+
+    pub fn draw(self: *Pane, term_io: *TermIO) !void {
+        try self.clear(term_io);
         try self.vtable.draw(self, term_io);
     }
 

src/tabs.zig

@@ -22,6 +22,8 @@ pub const TabBar = struct {
     index: usize,
 
     const Config = struct {
+        target: *TabbedTarget,
+
         align_text: menu.TextAlignment = .Center,
         style: Style = .{},
         highlight_color: colors.Color,
@@ -43,6 +45,9 @@ pub const TabBar = struct {
             },
         };
 
+        mem.config.target.content = mem.tabs[mem.index].pane;
+        log.debug("{*} - {*}", .{ mem.tabs[mem.index].pane, mem.config.target.content });
+
         return &mem.pane;
     }
 
@@ -90,12 +95,14 @@ pub const TabBar = struct {
                     if (self.index > 0) {
                         self.index -= 1;
                         try draw(pane_ptr, term_io);
+                        try self.config.target.update_content(self.tabs[self.index].pane, term_io);
                         return true;
                     }
                 },
                 .RIGHT => {
                     self.index = @min(self.index + 1, self.tabs.len - 1);
                     try draw(pane_ptr, term_io);
+                    try self.config.target.update_content(self.tabs[self.index].pane, term_io);
                     return true;
                 },
                 else => {},
@@ -107,12 +114,14 @@ pub const TabBar = struct {
                 if (self.index > 0) {
                     self.index -= 1;
                     try draw(pane_ptr, term_io);
+                    try self.config.target.update_content(self.tabs[self.index].pane, term_io);
                     return true;
                 }
             },
             'l' => {
                 self.index = @min(self.index + 1, self.tabs.len - 1);
                 try draw(pane_ptr, term_io);
+                try self.config.target.update_content(self.tabs[self.index].pane, term_io);
                 return true;
             },
             else => {},
@@ -125,3 +134,42 @@ pub const TabBar = struct {
         try draw(pane_ptr, term_io);
     }
 };
+
+pub const TabbedTarget = struct {
+    pane: Pane,
+    content: *Pane = undefined,
+
+    pub fn create(mem: *TabbedTarget, style: Style) *Pane {
+        mem.pane = Pane{
+            .style = style,
+            .vtable = .{
+                .resize = resize,
+                .draw = draw,
+            },
+        };
+
+        return &mem.pane;
+    }
+
+    fn update_content(self: *TabbedTarget, new_content: *Pane, term_io: *TermIO) !void {
+        self.content = new_content;
+        try self.pane.clear(term_io);
+        resize(&self.pane);
+        try self.content.draw(term_io);
+    }
+
+    fn resize(pane_ptr: *Pane) void {
+        var self: *TabbedTarget = @fieldParentPtr("pane", pane_ptr);
+
+        self.content.dimensions.size = self.pane.dimensions.internal_size;
+        self.content.dimensions.pos = self.pane.dimensions.internal_pos;
+
+        self.content.resize();
+    }
+
+    fn draw(pane_ptr: *Pane, term_io: *TermIO) !void {
+        var self: *TabbedTarget = @fieldParentPtr("pane", pane_ptr);
+
+        try self.content.draw(term_io);
+    }
+};