feat: support gradients

Author: Mathias-Boulay

src/lib.rs

@@ -84,8 +84,9 @@ pub use crate::term::{
 };
 pub use crate::utils::{
     colors_enabled, colors_enabled_stderr, measure_text_width, pad_str, pad_str_with,
-    set_colors_enabled, set_colors_enabled_stderr, style, truncate_str, Alignment, Attribute,
-    Color, Emoji, Style, StyledObject,
+    set_colors_enabled, set_colors_enabled_stderr, set_true_colors_enabled,
+    set_true_colors_enabled_stderr, style, true_colors_enabled, true_colors_enabled_stderr,
+    truncate_str, Alignment, Attribute, Color, Emoji, Style, StyledObject,
 };
 
 #[cfg(feature = "ansi-parsing")]

src/term.rs

@@ -78,6 +78,11 @@ impl TermFeatures<'_> {
         is_a_color_terminal(self.0)
     }
 
+    /// Check if true colors are supported by this terminal.
+    pub fn true_colors_supported(&self) -> bool {
+        is_a_true_color_terminal(self.0)
+    }
+
     /// Check if this terminal is an msys terminal.
     ///
     /// This is sometimes useful to disable features that are known to not

src/unix_term.rs

@@ -36,6 +36,16 @@ pub(crate) fn is_a_color_terminal(out: &Term) -> bool {
     }
 }
 
+pub(crate) fn is_a_true_color_terminal(out: &Term) -> bool {
+    if !is_a_color_terminal(out) {
+        return false;
+    }
+    match env::var("COLORTERM") {
+        Ok(term) => term == "truecolor" || term == "24bit",
+        Err(_) => false,
+    }
+}
+
 fn c_result<F: FnOnce() -> libc::c_int>(f: F) -> io::Result<()> {
     let res = f();
     if res != 0 {