feat(buffers): add support for ephemeral buffers

Ephemeral buffers are not hidden and kept when closed. Ephemeral buffers
can be turned into regular buffers by saving them with save_as.

src/buffer/Buffer.zig

@@ -40,6 +40,7 @@ file_eol_mode: EolMode = .lf,
 last_save_eol_mode: EolMode = .lf,
 file_utf8_sanitized: bool = false,
 hidden: bool = false,
+ephemeral: bool = false,
 
 undo_history: ?*UndoNode = null,
 redo_history: ?*UndoNode = null,
@@ -1279,6 +1280,7 @@ pub const StoreToFileError = error{
     NotDir,
     NotOpenForWriting,
     OperationAborted,
+    OutOfMemory,
     PathAlreadyExists,
     PipeBusy,
     ProcessFdQuotaExceeded,
@@ -1315,12 +1317,24 @@ pub fn store_to_file_and_clean(self: *Self, file_path: []const u8) StoreToFileEr
     self.last_save_eol_mode = self.file_eol_mode;
     self.file_exists = true;
     self.file_utf8_sanitized = false;
+    if (self.ephemeral) {
+        self.ephemeral = false;
+        self.file_path = try self.allocator.dupe(u8, file_path);
+    }
 }
 
 pub fn mark_clean(self: *Self) void {
     self.last_save = self.root;
 }
 
+pub fn is_hidden(self: *const Self) bool {
+    return self.hidden;
+}
+
+pub fn is_ephemeral(self: *const Self) bool {
+    return self.ephemeral;
+}
+
 pub fn is_dirty(self: *const Self) bool {
     return if (!self.file_exists)
         self.root.length() > 0

src/buffer/Manager.zig

@@ -47,6 +47,7 @@ pub fn open_scratch(self: *Self, file_path: []const u8, content: []const u8) Buf
     };
     buffer.update_last_used_time();
     buffer.hidden = false;
+    buffer.ephemeral = true;
     return buffer;
 }
 
@@ -56,11 +57,23 @@ pub fn get_buffer_for_file(self: *Self, file_path: []const u8) ?*Buffer {
 
 pub fn delete_buffer(self: *Self, file_path: []const u8) bool {
     const buffer = self.buffers.get(file_path) orelse return false;
+    const did_remove = self.buffers.remove(file_path);
     buffer.deinit();
-    return self.buffers.remove(file_path);
+    return did_remove;
 }
 
-pub fn retire(_: *Self, _: *Buffer) void {}
+pub fn retire(_: *Self, buffer: *Buffer) void {
+    tp.trace(tp.channel.debug, .{ "buffer", "retire", buffer.file_path, "hidden", buffer.hidden, "ephemeral", buffer.ephemeral });
+}
+
+pub fn close_buffer(self: *Self, buffer: *Buffer) void {
+    buffer.hidden = true;
+    tp.trace(tp.channel.debug, .{ "buffer", "close", buffer.file_path, "hidden", buffer.hidden, "ephemeral", buffer.ephemeral });
+    if (buffer.is_ephemeral()) {
+        _ = self.buffers.remove(buffer.file_path);
+        buffer.deinit();
+    }
+}
 
 pub fn list_most_recently_used(self: *Self, allocator: std.mem.Allocator) error{OutOfMemory}![]*Buffer {
     const result = try self.list_unordered(allocator);
@@ -98,6 +111,9 @@ pub fn save_all(self: *const Self) Buffer.StoreToFileError!void {
     var i = self.buffers.iterator();
     while (i.next()) |kv| {
         const buffer = kv.value_ptr.*;
+        if (buffer.is_ephemeral())
+            buffer.mark_clean()
+        else
             try buffer.store_to_file_and_clean(buffer.file_path);
     }
 }

src/project_manager.zig

@@ -125,7 +125,8 @@ pub fn delete_task(task: []const u8) (ProjectManagerError || ProjectError)!void
     return send(.{ "delete_task", project, task });
 }
 
-pub fn did_open(file_path: []const u8, file_type: *const FileType, version: usize, text: []const u8) (ProjectManagerError || ProjectError)!void {
+pub fn did_open(file_path: []const u8, file_type: *const FileType, version: usize, text: []const u8, ephemeral: bool) (ProjectManagerError || ProjectError)!void {
+    if (ephemeral) return;
     const project = tp.env.get().str("project");
     if (project.len == 0)
         return error.NoProject;
@@ -211,7 +212,8 @@ pub fn hover(file_path: []const u8, row: usize, col: usize) (ProjectManagerError
     return send(.{ "hover", project, file_path, row, col });
 }
 
-pub fn update_mru(file_path: []const u8, row: usize, col: usize) (ProjectManagerError || ProjectError)!void {
+pub fn update_mru(file_path: []const u8, row: usize, col: usize, ephemeral: bool) (ProjectManagerError || ProjectError)!void {
+    if (ephemeral) return;
     const project = tp.env.get().str("project");
     if (project.len == 0)
         return error.NoProject;

src/tui/Button.zig

@@ -82,6 +82,11 @@ pub fn State(ctx_type: type) type {
             allocator.destroy(self);
         }
 
+        pub fn update_label(self: *Self, label: []const u8) error{OutOfMemory}!void {
+            self.allocator.free(self.opts.label);
+            self.opts.label = try self.allocator.dupe(u8, label);
+        }
+
         pub fn layout(self: *Self) Widget.Layout {
             return self.opts.on_layout(&self.opts.ctx, self);
         }

src/tui/editor.zig

@@ -537,7 +537,13 @@ pub const Editor = struct {
             else
                 syntax.create_guess_file_type(self.allocator, content.items, self.file_path) catch null;
             if (syn) |syn_|
-                project_manager.did_open(file_path, syn_.file_type, self.lsp_version, try content.toOwnedSlice()) catch |e|
+                project_manager.did_open(
+                    file_path,
+                    syn_.file_type,
+                    self.lsp_version,
+                    try content.toOwnedSlice(),
+                    new_buf.is_ephemeral(),
+                ) catch |e|
                     self.logger.print("project_manager.did_open failed: {any}", .{e});
             break :syntax syn;
         };
@@ -563,6 +569,7 @@ pub const Editor = struct {
 
     fn save(self: *Self) !void {
         const b = self.buffer orelse return error.Stop;
+        if (b.is_ephemeral()) return self.logger.print_err("save", "ephemeral buffer, use save as", .{});
         if (!b.is_dirty()) return self.logger.print("no changes to save", .{});
         if (self.file_path) |file_path| {
             if (self.buffer) |b_mut| try b_mut.store_to_file_and_clean(file_path);
@@ -3785,23 +3792,24 @@ pub const Editor = struct {
     pub const save_file_as_meta = .{ .arguments = &.{.string} };
 
     pub fn close_file(self: *Self, _: Context) Result {
-        self.cancel_all_selections();
-        if (self.buffer) |buffer| {
-            if (buffer.is_dirty())
+        const buffer_ = self.buffer;
+        if (buffer_) |buffer| if (buffer.is_dirty())
             return tp.exit("unsaved changes");
-            buffer.hidden = true;
-        }
+        self.cancel_all_selections();
         try self.close();
+        if (buffer_) |buffer|
+            self.buffer_manager.close_buffer(buffer);
     }
     pub const close_file_meta = .{ .description = "Close file" };
 
     pub fn close_file_without_saving(self: *Self, _: Context) Result {
         self.cancel_all_selections();
-        if (self.buffer) |buffer| {
+        const buffer_ = self.buffer;
+        if (buffer_) |buffer|
             buffer.reset_to_last_saved();
-            buffer.hidden = true;
-        }
         try self.close();
+        if (buffer_) |buffer|
+            self.buffer_manager.close_buffer(buffer);
     }
     pub const close_file_without_saving_meta = .{ .description = "Close file without saving" };
 
@@ -4781,7 +4789,13 @@ pub const Editor = struct {
             try root.store(content.writer(), try self.buf_eol_mode());
             const syn = syntax.create_file_type(self.allocator, file_type) catch null;
             if (syn) |syn_| if (self.file_path) |file_path|
-                project_manager.did_open(file_path, syn_.file_type, self.lsp_version, try content.toOwnedSlice()) catch |e|
+                project_manager.did_open(
+                    file_path,
+                    syn_.file_type,
+                    self.lsp_version,
+                    try content.toOwnedSlice(),
+                    if (self.buffer) |p| p.is_ephemeral() else true,
+                ) catch |e|
                     self.logger.print("project_manager.did_open failed: {any}", .{e});
             break :syntax syn;
         };

src/tui/mainview.zig

@@ -412,6 +412,22 @@ const cmds = struct {
     }
     pub const delete_buffer_meta = .{ .arguments = &.{.string} };
 
+    pub fn close_buffer(self: *Self, ctx: Ctx) Result {
+        var file_path: []const u8 = undefined;
+        if (!(ctx.args.match(.{tp.extract(&file_path)}) catch false))
+            return error.InvalidDeleteBufferArgument;
+        const buffer = self.buffer_manager.get_buffer_for_file(file_path) orelse return;
+        if (buffer.is_dirty())
+            return tp.exit("unsaved changes");
+        if (self.get_active_editor()) |editor| if (editor.buffer == buffer) {
+            editor.close_file(.{}) catch |e| return e;
+            return;
+        };
+        _ = self.buffer_manager.close_buffer(buffer);
+        tui.need_render();
+    }
+    pub const close_buffer_meta = .{ .arguments = &.{.string} };
+
     pub fn restore_session(self: *Self, _: Ctx) Result {
         if (tp.env.get().str("project").len == 0) {
             try open_project_cwd(self, .{});
@@ -859,16 +875,17 @@ pub fn location_update(self: *Self, m: tp.message) tp.result {
     var row: usize = 0;
     var col: usize = 0;
     const file_path = self.get_active_file_path() orelse return;
+    const ephemeral = if (self.get_active_buffer()) |buffer| buffer.is_ephemeral() else false;
 
     if (try m.match(.{ tp.any, tp.any, tp.any, tp.extract(&row), tp.extract(&col) })) {
         if (row == 0 and col == 0) return;
-        project_manager.update_mru(file_path, row, col) catch {};
+        project_manager.update_mru(file_path, row, col, ephemeral) catch {};
         return self.location_history.update(file_path, .{ .row = row + 1, .col = col + 1 }, null);
     }
 
     var sel: location_history.Selection = .{};
     if (try m.match(.{ tp.any, tp.any, tp.any, tp.extract(&row), tp.extract(&col), tp.extract(&sel.begin.row), tp.extract(&sel.begin.col), tp.extract(&sel.end.row), tp.extract(&sel.end.col) })) {
-        project_manager.update_mru(file_path, row, col) catch {};
+        project_manager.update_mru(file_path, row, col, ephemeral) catch {};
         return self.location_history.update(file_path, .{ .row = row + 1, .col = col + 1 }, sel);
     }
 }
@@ -911,6 +928,10 @@ pub fn get_active_file_path(self: *Self) ?[]const u8 {
     return if (self.get_active_editor()) |editor| editor.file_path orelse null else null;
 }
 
+pub fn get_active_buffer(self: *Self) ?*Buffer {
+    return if (self.get_active_editor()) |editor| editor.buffer orelse null else null;
+}
+
 pub fn walk(self: *Self, ctx: *anyopaque, f: Widget.WalkFn, w: *Widget) bool {
     return self.floating_views.walk(ctx, f) or self.widgets.walk(ctx, f, &self.widgets_widget) or f(ctx, w);
 }

src/tui/status/tabs.zig

@@ -117,6 +117,8 @@ const TabBar = struct {
                 try self.widget_list.add(try self.make_spacer());
             }
             try self.widget_list.add(tab.widget);
+            if (tab.widget.dynamic_cast(Button.State(Tab))) |btn|
+                try btn.update_label(Tab.name_from_buffer(tab.buffer));
         }
     }
 
@@ -212,7 +214,7 @@ const Tab = struct {
     }
 
     fn on_click2(self: *@This(), _: *Button.State(@This())) void {
-        tp.self_pid().send(.{ "cmd", "delete_buffer", .{self.buffer.file_path} }) catch {};
+        tp.self_pid().send(.{ "cmd", "close_buffer", .{self.buffer.file_path} }) catch {};
     }
 
     fn render(self: *@This(), btn: *Button.State(@This()), theme: *const Widget.Theme) bool {