More work on mouse selections

kittens/diff/mouse.go

@@ -0,0 +1,61 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package diff
+
+import (
+	"fmt"
+	"kitty"
+	"kitty/tools/config"
+	"kitty/tools/tui/loop"
+	"kitty/tools/utils"
+	"path/filepath"
+	"strconv"
+)
+
+var _ = fmt.Print
+
+type MouseSelection struct {
+	start_line, end_line ScrollPos
+}
+
+type KittyOpts struct {
+	Wheel_scroll_multiplier int
+}
+
+func read_relevant_kitty_opts(path string) KittyOpts {
+	ans := KittyOpts{Wheel_scroll_multiplier: kitty.KittyConfigDefaults.Wheel_scroll_multiplier}
+	handle_line := func(key, val string) error {
+		switch key {
+		case "wheel_scroll_multiplier":
+			v, err := strconv.Atoi(val)
+			if err == nil {
+				ans.Wheel_scroll_multiplier = v
+			}
+		}
+		return nil
+	}
+	cp := config.ConfigParser{LineHandler: handle_line}
+	cp.ParseFiles(path)
+	return ans
+}
+
+var RelevantKittyOpts = (&utils.Once[KittyOpts]{Run: func() KittyOpts {
+	return read_relevant_kitty_opts(filepath.Join(utils.ConfigDir(), "kitty.conf"))
+}}).Get
+
+func (self *Handler) handle_wheel_event(up bool) {
+	amt := RelevantKittyOpts().Wheel_scroll_multiplier
+	if up {
+		amt *= -1
+	}
+	self.dispatch_action(`scroll_by`, strconv.Itoa(amt))
+}
+
+func (self *Handler) start_mouse_selection(ev *loop.MouseEvent) {
+}
+
+func (self *Handler) update_mouse_selection(ev *loop.MouseEvent) {
+}
+
+func (self *Handler) finish_mouse_selection(ev *loop.MouseEvent) {
+}