#133 blinking text 50%

config/src/lib.rs

@@ -1075,6 +1075,24 @@ pub struct Config {
     #[serde(default)]
     pub default_cursor_style: DefaultCursorStyle,
 
+    /// Specifies how often blinking text (normal speed) transitions
+    /// between visible and invisible, expressed in milliseconds.
+    /// Setting this to 0 disables slow text blinking.  Note that this
+    /// value is approximate due to the way that the system event loop
+    /// schedulers manage timers; non-zero values will be at least the
+    /// interval specified with some degree of slop.
+    #[serde(default = "default_text_blink_rate")]
+    pub text_blink_rate: u64,
+
+    /// Specifies how often blinking text (rapid speed) transitions
+    /// between visible and invisible, expressed in milliseconds.
+    /// Setting this to 0 disables rapid text blinking.  Note that this
+    /// value is approximate due to the way that the system event loop
+    /// schedulers manage timers; non-zero values will be at least the
+    /// interval specified with some degree of slop.
+    #[serde(default = "default_text_blink_rate_rapid")]
+    pub text_blink_rate_rapid: u64,
+
     /// If non-zero, specifies the period (in seconds) at which various
     /// statistics are logged.  Note that there is a minimum period of
     /// 10 seconds.
@@ -1742,6 +1760,14 @@ fn default_cursor_blink_rate() -> u64 {
     800
 }
 
+fn default_text_blink_rate() -> u64 {
+    500
+}
+
+fn default_text_blink_rate_rapid() -> u64 {
+    250
+}
+
 fn default_swap_backspace_and_delete() -> bool {
     // cfg!(target_os = "macos")
     // See: https://github.com/wez/wezterm/issues/88

wezterm-gui/src/termwindow/mod.rs

@@ -217,6 +217,8 @@ pub struct TermWindow {
 
     next_blink_paint: RefCell<Instant>,
     last_status_call: Instant,
+    last_text_blink_paint: Instant,
+    last_text_blink_paint_rapid: Instant,
 
     palette: Option<ColorPalette>,
 
@@ -482,6 +484,8 @@ impl TermWindow {
             )),
             next_blink_paint: RefCell::new(Instant::now()),
             last_status_call: Instant::now(),
+            last_text_blink_paint: Instant::now(),
+            last_text_blink_paint_rapid: Instant::now(),
             event_states: HashMap::new(),
             has_animation: RefCell::new(None),
             scheduled_animation: RefCell::new(None),

wezterm-gui/src/termwindow/render.rs

@@ -20,8 +20,8 @@ use mux::tab::{PositionedPane, PositionedSplit, SplitDirection};
 use smol::Timer;
 use std::ops::Range;
 use std::rc::Rc;
-use std::time::Duration;
-use std::time::Instant;
+use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
+use termwiz::cell::Blink;
 use termwiz::cellcluster::CellCluster;
 use termwiz::surface::{CursorShape, CursorVisibility};
 use wezterm_font::units::PixelLength;
@@ -745,6 +745,28 @@ impl super::TermWindow {
                         std::mem::swap(&mut fg, &mut bg);
                         bg_default = false;
                     }
+                    // Check for blink, and if this is the "not-blink"
+                    // part of blinking then set fg = bg.  This is a cheap
+                    // means of getting it done without impacting other
+                    // features.
+                    if attrs.blink() != Blink::None
+                        && (self.config.text_blink_rate != 0
+                            || self.config.text_blink_rate_rapid != 0)
+                    {
+                        let blink_rate = match attrs.blink() {
+                            Blink::Rapid => params.config.text_blink_rate_rapid,
+                            _ => params.config.text_blink_rate,
+                        };
+                        let uptime = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
+                        let milli_uptime =
+                            uptime.as_secs() as u128 * 1000 + uptime.subsec_millis() as u128;
+                        let ticks = milli_uptime / blink_rate as u128;
+                        if (ticks & 1) == 0 {
+                            fg = bg;
+                        }
+
+                        // TODO: maintain/update last_text_blink_paint here
+                    }
 
                     (fg, bg, bg_default)
                 };