Implement pasting HTML on Windows

Cargo.toml

@@ -29,7 +29,7 @@ windows-sys = { version = "0.48.0", optional = true, features = [
     "Win32_System_Memory",
     "Win32_System_Ole",
 ]}
-clipboard-win = "5.0.0"
+clipboard-win = "5.3.1"
 log = "0.4"
 
 [target.'cfg(target_os = "macos")'.dependencies]

examples/get_html.rs

@@ -6,4 +6,4 @@ fn main() {
 	let html_data = ctx.get_html().unwrap();
 
 	println!("HTML data is:\n{:?}\nAlt text is:\n{:?}", html_data.html, html_data.alt_text);
-}
+}

examples/hello_html.rs

@@ -12,4 +12,4 @@ fn main() {
 		"But now the clipboard text should be this HTML: \"{}\" with this alternate text: \"{}\"",
 		html, alt_text
 	);
-}
+}

src/common.rs

@@ -185,6 +185,7 @@ impl<F: FnOnce()> Drop for ScopeGuard<F> {
 }
 
 /// Common trait for sealing platform extension traits.
+#[cfg(not(target_os = "macos"))]
 pub(crate) mod private {
 	pub trait Sealed {}
 

src/platform/osx.rs

@@ -8,9 +8,9 @@ the Apache 2.0 or the MIT license at the licensee's choice. The terms
 and conditions of the chosen license apply to this file.
 */
 
-use crate::common::Error;
 #[cfg(feature = "image-data")]
 use crate::common::ImageData;
+use crate::common::{Error, HTMLData};
 #[cfg(feature = "image-data")]
 use core_graphics::{
 	base::{kCGBitmapByteOrderDefault, kCGImageAlphaLast, kCGRenderingIntentDefault, CGFloat},
@@ -210,6 +210,11 @@ impl<'clipboard> Get<'clipboard> {
 		})
 	}
 
+	/// TODO: Implement get_html for MacOS.
+	pub(crate) fn html(self) -> Result<HTMLData, Error> {
+		self.text().map(HTMLData::from_alt_text)
+	}
+
 	#[cfg(feature = "image-data")]
 	pub(crate) fn image(self) -> Result<ImageData<'static>, Error> {
 		use objc_foundation::NSData;

src/platform/windows.rs

@@ -8,9 +8,11 @@ the Apache 2.0 or the MIT license at the licensee's choice. The terms
 and conditions of the chosen license apply to this file.
 */
 
+use clipboard_win::{formats, Getter};
+
 #[cfg(feature = "image-data")]
 use crate::common::ImageData;
-use crate::common::{private, Error};
+use crate::common::{private, Error, HTMLData};
 use std::{borrow::Cow, marker::PhantomData, thread, time::Duration};
 
 #[cfg(feature = "image-data")]
@@ -522,6 +524,27 @@ impl<'clipboard> Get<'clipboard> {
 		String::from_utf16(&out[..bytes_read]).map_err(|_| Error::ConversionFailure)
 	}
 
+	pub(crate) fn html(self) -> Result<HTMLData, Error> {
+		if let Some(format_code) = clipboard_win::register_format("HTML Format") {
+			let _clipboard_assertion = self.clipboard?;
+
+			if !clipboard_win::is_format_avail(format_code.get()) {
+				return Err(Error::ContentNotAvailable);
+			}
+
+			let html_format = formats::Html::new().unwrap();
+			let mut html_out = String::new();
+			html_format
+				.read_clipboard(&mut html_out)
+				.map(|_| HTMLData::from_html(html_out))
+				.map_err(|e| {
+					Error::unknown(format!("failed to read clipboard HTML data, code {:?}", e))
+				})
+		} else {
+			Err(Error::ContentNotAvailable)
+		}
+	}
+
 	#[cfg(feature = "image-data")]
 	pub(crate) fn image(self) -> Result<ImageData<'static>, Error> {
 		const FORMAT: u32 = clipboard_win::formats::CF_DIBV5;