wip: refactor: removing seams

src/text.rs

@@ -0,0 +1,43 @@
+pub(crate) use ::unicode_width::*;
+
+/// Displays an owned [str]-like with fixed maximum width.
+///
+/// Width is computed using [unicode_width].
+pub struct TrimString<T: AsRef<str>>(pub u16, pub T);
+
+/// Displays a borrowed [str]-like with fixed maximum width
+///
+/// Width is computed using [unicode_width].
+pub struct TrimStringRef<'a, T: AsRef<str>>(pub u16, pub &'a T);
+
+impl<'a, T: AsRef<str>> TrimString<T> {
+    fn to_ref (&self) -> TrimStringRef<'_, T> { TrimStringRef(self.0, &self.1) }
+}
+
+/// Trim string with [unicode_width].
+pub fn trim_string (max_width: usize, input: impl AsRef<str>) -> String {
+    let input = input.as_ref();
+    let mut output = Vec::with_capacity(input.len());
+    let mut width: usize = 1;
+    let mut chars = input.chars();
+    while let Some(c) = chars.next() {
+        if width > max_width {
+            break
+        }
+        output.push(c);
+        width += c.width().unwrap_or(0);
+    }
+    return output.into_iter().collect()
+}
+
+pub(crate) fn width_chars_max (max: u16, text: impl AsRef<str>) -> u16 {
+    let mut width: u16 = 0;
+    let mut chars = text.as_ref().chars();
+    while let Some(c) = chars.next() {
+        width += c.width().unwrap_or(0) as u16;
+        if width > max {
+            break
+        }
+    }
+    return width
+}