Move terminal colors to the shared util module.

src/util/mod.rs

@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use std::path::Path;
 
 use tokio::process::Command;
@@ -189,3 +190,44 @@ fn global_settings_elisp(global_settings: &GlobalSettings) -> String {
     }
     ret
 }
+
+fn should_use_color() -> bool {
+    !std::env::var("NO_COLOR").is_ok_and(|val| !val.is_empty())
+}
+
+pub(crate) fn foreground_color(red: u8, green: u8, blue: u8) -> Cow<'static, str> {
+    if should_use_color() {
+        format!(
+            "\x1b[38;2;{red};{green};{blue}m",
+            red = red,
+            green = green,
+            blue = blue
+        )
+        .into()
+    } else {
+        Cow::from("")
+    }
+}
+
+#[allow(dead_code)]
+pub(crate) fn background_color(red: u8, green: u8, blue: u8) -> Cow<'static, str> {
+    if should_use_color() {
+        format!(
+            "\x1b[48;2;{red};{green};{blue}m",
+            red = red,
+            green = green,
+            blue = blue
+        )
+        .into()
+    } else {
+        Cow::from("")
+    }
+}
+
+pub(crate) fn reset_color() -> &'static str {
+    if should_use_color() {
+        "\x1b[0m"
+    } else {
+        ""
+    }
+}