[rust] update capabilities, support new functions.

- add new Notcurses methods: `canhalfblock()` and `canquadrant()`.
- add doc links to NCBLIT_* flags from the capabilities methods.
- update the full-capabilites example to include `canhalfblock`, `canquadrant`,
  `canchangecolor` and `canfade` functions.
- rustfmt

rust/examples/full-capabilities.rs

@@ -10,19 +10,27 @@ fn main() -> NcResult<()> {
         "Can display UTF-8: {0}
 Can display braille characters: {1}
 Can display sextant characters: {2}
-Can open images: {3}
-Can open videos: {4}
-Supports Pixels: {5:?}
-Supports True Color: {6}
-Palette size: {7:?}
+Can display quadrant characters: {3}
+Can display half block characters: {4}
+Can open images: {5}
+Can open videos: {6}
+Supports Pixels: {7:?}
+Supports True Color: {8}
+Supports fading: {9}
+Supports changing the palette: {10}
+Palette size: {11:?}
 ",
         nc.canutf8(),
         nc.canbraille(),
         nc.cansextant(),
+        nc.canquadrant(),
+        nc.canhalfblock(),
         nc.canopen_images(),
         nc.canopen_videos(),
         nc.check_pixel_support(),
         nc.cantruecolor(),
+        nc.canfade(),
+        nc.canchangecolor(),
         nc.palette_size(),
     );
 

rust/src/bindings.rs

@@ -711,8 +711,10 @@ pub use ffi::{
     notcurses_canbraille,
     notcurses_canchangecolor,
     notcurses_canfade,
+    notcurses_canhalfblock,
     notcurses_canopen_images,
     notcurses_canopen_videos,
+    notcurses_canquadrant,
     notcurses_cansextant,
     notcurses_cantruecolor,
     notcurses_canutf8,

rust/src/channel/mod.rs

@@ -61,7 +61,7 @@
 // X channels_set_fg_rgb8_clipped    // not needed
 
 #[allow(unused_imports)] // for the doc comments
-use crate::{NcRgba};
+use crate::NcRgba;
 
 #[cfg(test)]
 mod test;

rust/src/notcurses/methods.rs

@@ -162,6 +162,8 @@ impl Notcurses {
 
     /// Returns true if we can reliably use Unicode Braille.
     ///
+    /// See also [NCBLIT_BRAILLE][crate::NCBLIT_BRAILLE].
+    ///
     /// *C style function: [notcurses_canbraille()][crate::notcurses_canbraille].*
     pub fn canbraille(&self) -> bool {
         unsafe { crate::notcurses_canbraille(self) }
@@ -185,6 +187,15 @@ impl Notcurses {
         unsafe { crate::notcurses_canfade(self) }
     }
 
+    /// Returns true if we can reliably use Unicode half blocks.
+    ///
+    /// See also [NCBLIT_2x1][crate::NCBLIT_2x1].
+    ///
+    /// *C style function: [notcurses_canhalfblock()][crate::notcurses_canhalfblock].*
+    pub fn canhalfblock(&self) -> bool {
+        unsafe { crate::notcurses_canhalfblock(self) }
+    }
+
     /// Returns true if loading images is possible.
     ///
     /// This requires being built against FFmpeg/OIIO.
@@ -203,8 +214,19 @@ impl Notcurses {
         unsafe { crate::notcurses_canopen_videos(self) }
     }
 
+    /// Returns true if we can reliably use Unicode quadrant blocks.
+    ///
+    /// See also [NCBLIT_2x2][crate::NCBLIT_2x2].
+    ///
+    /// *C style function: [notcurses_canquadrant()][crate::notcurses_canquadrant].*
+    pub fn canquadrant(&self) -> bool {
+        unsafe { crate::notcurses_canquadrant(self) }
+    }
+
     /// Returns true if we can reliably use Unicode 13 sextants.
     ///
+    /// See also [NCBLIT_3x2][crate::NCBLIT_3x2].
+    ///
     /// *C style function: [notcurses_cansextant()][crate::notcurses_cansextant].*
     pub fn cansextant(&self) -> bool {
         unsafe { crate::notcurses_cansextant(self) }
@@ -231,7 +253,8 @@ impl Notcurses {
     ///
     /// Returns `false` for no support, or `true` if pixel output is supported.
     ///
-    /// This function must successfully return before NCBLIT_PIXEL is available.
+    /// This function must successfully return before
+    /// [NCBLIT_PIXEL][crate::NCBLIT_PIXEL] is available.
     ///
     /// Must not be called concurrently with either input or rasterization.
     ///

rust/src/visual/mod.rs

@@ -142,7 +142,7 @@ pub const NCVISUAL_OPTION_HORALIGNED: u32 = crate::bindings::ffi::NCVISUAL_OPTIO
 /// - without sextant support, NCBLIT_3x2 decays to NCBLIT_2x2
 /// - without quadrant support, NCBLIT_2x2 decays to NCBLIT_2x1
 /// - the only viable blitters in ASCII are NCBLIT_1x1 and NCBLIT_PIXEL
-/// 
+///
 /// If you don't want this behaviour you have to use [NCVISUAL_OPTION_NODEGRADE]
 ///
 pub type NcBlitter = crate::bindings::ffi::ncblitter_e;