From 233e881f95de8f6449e6d22904c55ec8e2192c24 Mon Sep 17 00:00:00 2001
From: CJ van den Berg <cj@vdbonline.com>
Date: Tue, 24 Dec 2024 14:44:12 +0100
Subject: [PATCH] feat: add support for pasting from the native windows
 clipboard

This give us OSC52 equivalent support on windows.

closes #95
---
 src/renderer/vaxis/renderer.zig | 24 ++++++++++++++++++++++++
 src/tui/mainview.zig            |  7 +++++--
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/src/renderer/vaxis/renderer.zig b/src/renderer/vaxis/renderer.zig
index 6e866ee..80bccb3 100644
--- a/src/renderer/vaxis/renderer.zig
+++ b/src/renderer/vaxis/renderer.zig
@@ -349,6 +349,30 @@ pub fn request_system_clipboard(self: *Self) void {
     self.vx.requestSystemClipboard(self.tty.anyWriter()) catch |e| log.logger(log_name).err("request_system_clipboard", e);
 }
 
+pub fn request_windows_clipboard(self: *Self) ![]u8 {
+    const windows = std.os.windows;
+    const win32 = struct {
+        pub extern "user32" fn OpenClipboard(hWndNewOwner: ?windows.HWND) callconv(windows.WINAPI) windows.BOOL;
+        pub extern "user32" fn CloseClipboard() callconv(windows.WINAPI) windows.BOOL;
+        pub extern "user32" fn SetClipboardData(uFormat: windows.UINT, hMem: windows.HANDLE) callconv(windows.WINAPI) ?windows.HANDLE;
+        pub extern "user32" fn GetClipboardData(uFormat: windows.UINT) callconv(windows.WINAPI) ?windows.HANDLE;
+        pub extern "kernel32" fn GlobalLock(hMem: windows.HANDLE) ?windows.LPVOID;
+        pub extern "kernel32" fn GlobalUnlock(hMem: windows.HANDLE) windows.BOOL;
+        const CF_TEXT = @as(c_int, 1);
+    };
+
+    if (win32.OpenClipboard(null) == 0)
+        return error.OpenClipBoardFailed;
+    defer _ = win32.CloseClipboard();
+
+    const mem = win32.GetClipboardData(win32.CF_TEXT) orelse return error.ClipboardDataRetrievalFailed;
+    const data: [*c]u8 = @ptrCast(win32.GlobalLock(mem) orelse return error.ClipboardDataLockFailed);
+    const text = std.mem.span(data);
+    defer _ = win32.GlobalUnlock(mem);
+
+    return self.allocator.dupe(u8, text);
+}
+
 pub fn request_mouse_cursor_text(self: *Self, push_or_pop: bool) void {
     if (push_or_pop) self.vx.setMouseShape(.text) else self.vx.setMouseShape(.default);
 }
diff --git a/src/tui/mainview.zig b/src/tui/mainview.zig
index b675ac8..e5d00e1 100644
--- a/src/tui/mainview.zig
+++ b/src/tui/mainview.zig
@@ -571,8 +571,11 @@ const cmds = struct {
     pub const open_previous_file_meta = .{ .description = "Open the previous file" };
 
     pub fn system_paste(_: *Self, _: Ctx) Result {
-        if (builtin.os.tag == .windows)
-            return command.executeName("paste", .{}) catch {};
+        if (builtin.os.tag == .windows) {
+            const text = try tui.current().rdr.request_windows_clipboard();
+            defer tui.current().rdr.allocator.free(text);
+            return command.executeName("paste", command.fmt(.{text})) catch {};
+        }
         tui.current().rdr.request_system_clipboard();
     }
     pub const system_paste_meta = .{ .description = "Paste from system clipboard" };