small cleanups (#129)

- don't parse color strings for defaults
- fix comment misstating type of vec
- impl size_hint and ExactSizeIterator for PopOnNext

src/main.rs

@@ -39,7 +39,7 @@ use tdf::{
 	PrerenderLimit,
 	converter::{ConvertedPage, ConverterMsg, run_conversion_loop},
 	kitty::{KittyDisplay, display_kitty_images, do_shms_work, run_action},
-	renderer::{self, RenderError, RenderInfo, RenderNotif},
+	renderer::{self, MUPDF_BLACK, MUPDF_WHITE, RenderError, RenderInfo, RenderNotif},
 	tui::{BottomMessage, InputAction, MessageSetting, Tui}
 };
 
@@ -128,21 +128,37 @@ async fn inner_main() -> Result<(), WrappedErr> {
 		.canonicalize()
 		.map_err(|e| WrappedErr(format!("Cannot canonicalize provided file: {e}").into()))?;
 
-	let black =
-		parse_color_to_i32(flags.black_color.as_deref().unwrap_or("000000")).map_err(|e| {
+	let black = flags
+		.black_color
+		.as_deref()
+		.map(|color| {
+			parse_color_to_i32(color).map_err(|e| {
 				WrappedErr(
-				format!("Couldn't parse black color: {e} - is it formatted like a CSS color?")
+					format!(
+						"Couldn't parse black color {color:?}: {e} - is it formatted like a CSS color?"
+					)
 					.into()
 				)
-		})?;
+			})
+		})
+		.transpose()?
+		.unwrap_or(MUPDF_BLACK);
 
-	let white =
-		parse_color_to_i32(flags.white_color.as_deref().unwrap_or("FFFFFF")).map_err(|e| {
+	let white = flags
+		.white_color
+		.as_deref()
+		.map(|color| {
+			parse_color_to_i32(color).map_err(|e| {
 				WrappedErr(
-				format!("Couldn't parse white color: {e} - is it formatted like a CSS color?")
+					format!(
+						"Couldn't parse white color {color:?}: {e} - is it formatted like a CSS color?"
+					)
 					.into()
 				)
-		})?;
+			})
+		})
+		.transpose()?
+		.unwrap_or(MUPDF_WHITE);
 
 	// need to keep it around throughout the lifetime of the program, but don't rly need to use it.
 	// Just need to make sure it doesn't get dropped yet.

src/renderer.rs

@@ -57,8 +57,8 @@ struct PrevRender {
 	num_search_found: Option<usize>
 }
 
-const MUPDF_BLACK: i32 = 0;
-const MUPDF_WHITE: i32 = i32::from_be_bytes([0, 0xff, 0xff, 0xff]);
+pub const MUPDF_BLACK: i32 = 0;
+pub const MUPDF_WHITE: i32 = i32::from_be_bytes([0, 0xff, 0xff, 0xff]);
 
 #[inline]
 pub fn fill_default<T: Default>(vec: &mut Vec<T>, size: usize) {
@@ -152,8 +152,8 @@ pub fn start_rendering(
 
 		sender.send(Ok(RenderInfo::NumPages(n_pages.get())))?;
 
-		// We're using this vec of bools to indicate which page numbers have already been rendered,
-		// to support people jumping to specific pages and having quick rendering results. We
+		// We're using this vec to indicate which page numbers have already been rendered, to
+		// support people jumping to specific pages and having quick rendering results. We
 		// `split_at_mut` at 0 initially (which bascially makes `right == rendered && left == []`),
 		// doing basically nothing, but if we get a notification that something has been jumped to,
 		// then we can split at that page and render at both sides of it
@@ -570,4 +570,15 @@ impl Iterator for PopOnNext<'_> {
 	fn next(&mut self) -> Option<Self::Item> {
 		self.inner.pop_front()
 	}
+
+	fn size_hint(&self) -> (usize, Option<usize>) {
+		let l = self.len();
+		(l, Some(l))
+	}
+}
+
+impl ExactSizeIterator for PopOnNext<'_> {
+	fn len(&self) -> usize {
+		self.inner.len()
+	}
 }