fix: Allow multi-line prompt documentation

Author: archseer

helix-term/src/ui/markdown.rs

@@ -247,19 +247,8 @@ impl Component for Markdown {
 
         // TODO: account for tab width
         let max_text_width = (viewport.0 - padding).min(120);
-        let mut text_width = 0;
-        let mut height = padding;
-        for content in contents {
-            height += 1;
-            let content_width = content.width() as u16;
-            if content_width > max_text_width {
-                text_width = max_text_width;
-                height += content_width / max_text_width;
-            } else if content_width > text_width {
-                text_width = content_width;
-            }
-        }
+        let (width, height) = crate::ui::text::required_size(&contents, max_text_width);
 
-        Some((text_width + padding, height))
+        Some((width + padding * 2, height))
     }
 }

helix-term/src/ui/prompt.rs

@@ -389,21 +389,27 @@ impl Prompt {
         if let Some(doc) = (self.doc_fn)(&self.line) {
             let mut text = ui::Text::new(doc.to_string());
 
+            let max_width = BASE_WIDTH * 3;
+            let padding = 1;
+
             let viewport = area;
+
+            let (_width, height) = ui::text::required_size(&text.contents, max_width);
+
             let area = viewport.intersection(Rect::new(
                 completion_area.x,
-                completion_area.y.saturating_sub(3),
-                BASE_WIDTH * 3,
-                3,
+                completion_area.y.saturating_sub(height + padding * 2),
+                max_width,
+                height + padding * 2,
             ));
 
             let background = theme.get("ui.help");
             surface.clear_with(area, background);
 
             text.render(
                 area.inner(&Margin {
-                    vertical: 1,
-                    horizontal: 1,
+                    vertical: padding,
+                    horizontal: padding,
                 }),
                 surface,
                 cx,

helix-term/src/ui/text.rs

@@ -4,7 +4,7 @@ use tui::buffer::Buffer as Surface;
 use helix_view::graphics::Rect;
 
 pub struct Text {
-    contents: tui::text::Text<'static>,
+    pub(crate) contents: tui::text::Text<'static>,
     size: (u16, u16),
     viewport: (u16, u16),
 }
@@ -49,3 +49,19 @@ impl Component for Text {
         Some(self.size)
     }
 }
+
+pub fn required_size(text: &tui::text::Text, max_text_width: u16) -> (u16, u16) {
+    let mut text_width = 0;
+    let mut height = 0;
+    for content in &text.lines {
+        height += 1;
+        let content_width = content.width() as u16;
+        if content_width > max_text_width {
+            text_width = max_text_width;
+            height += content_width / max_text_width;
+        } else if content_width > text_width {
+            text_width = content_width;
+        }
+    }
+    (text_width, height)
+}