diff --git a/.gitignore b/.gitignore
index 7137221..def140c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 /target
-result/
+/result
 *.json
 tarpaulin-report.*
 *.profraw
diff --git a/Cargo.lock b/Cargo.lock
index ffdc001..a0f76e3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1210,6 +1210,19 @@ dependencies = [
  "unicase",
 ]
 
+[[package]]
+name = "pulldown-cmark"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e8bbe1a966bd2f362681a44f6edce3c2310ac21e4d5067a6e7ec396297a6ea0"
+dependencies = [
+ "bitflags 2.6.0",
+ "getopts",
+ "memchr",
+ "pulldown-cmark-escape",
+ "unicase",
+]
+
 [[package]]
 name = "pulldown-cmark-escape"
 version = "0.11.0"
@@ -1500,6 +1513,7 @@ dependencies = [
  "csv",
  "futures",
  "ironcalc",
+ "pulldown-cmark 0.13.0",
  "ratatui",
  "serde_json",
  "slice-utils",
@@ -1758,7 +1772,7 @@ dependencies = [
  "ansi-to-tui",
  "itertools 0.13.0",
  "pretty_assertions",
- "pulldown-cmark",
+ "pulldown-cmark 0.12.2",
  "ratatui",
  "rstest",
  "syntect",
diff --git a/Cargo.toml b/Cargo.toml
index d310e68..ca39db7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,3 +21,4 @@ serde_json = "1.0.133"
 colorsys = "0.6.7"
 tui-markdown = { version = "0.3.1", features = [] }
 csv = "1.3.1"
+pulldown-cmark = "0.13.0"
diff --git a/src/book/test.rs b/src/book/test.rs
index 6ece6b7..240a288 100644
--- a/src/book/test.rs
+++ b/src/book/test.rs
@@ -36,8 +36,15 @@ fn test_book_default() {
 #[test]
 fn test_book_insert_cell_new_row() {
     let mut book = Book::default();
-    book.update_cell(&Address { sheet: 0, row: 2, col: 1 }, "1")
-        .expect("failed to edit cell");
+    book.update_cell(
+        &Address {
+            sheet: 0,
+            row: 2,
+            col: 1,
+        },
+        "1",
+    )
+    .expect("failed to edit cell");
     book.evaluate();
     let WorksheetDimension {
         min_row,
@@ -52,8 +59,15 @@ fn test_book_insert_cell_new_row() {
 #[test]
 fn test_book_insert_cell_new_column() {
     let mut book = Book::default();
-    book.update_cell(&Address { sheet: 0, row: 1, col: 2 }, "1")
-        .expect("failed to edit cell");
+    book.update_cell(
+        &Address {
+            sheet: 0,
+            row: 1,
+            col: 2,
+        },
+        "1",
+    )
+    .expect("failed to edit cell");
     let WorksheetDimension {
         min_row,
         max_row,
@@ -67,14 +81,32 @@ fn test_book_insert_cell_new_column() {
 #[test]
 fn test_book_insert_rows() {
     let mut book = Book::default();
-    book.update_cell(&Address { sheet: 0, row: 2, col: 2 }, "1")
-        .expect("failed to edit cell");
-    book.move_to(&Address { sheet: 0, row: 2, col: 2 })
-        .expect("Failed to move to location");
+    book.update_cell(
+        &Address {
+            sheet: 0,
+            row: 2,
+            col: 2,
+        },
+        "1",
+    )
+    .expect("failed to edit cell");
+    book.move_to(&Address {
+        sheet: 0,
+        row: 2,
+        col: 2,
+    })
+    .expect("Failed to move to location");
     assert_eq!((2, 2), book.get_size().expect("Failed to get size"));
     book.insert_rows(1, 5).expect("Failed to insert rows");
     assert_eq!((7, 2), book.get_size().expect("Failed to get size"));
-    assert_eq!(Address { sheet: 0, row: 7, col: 2 }, book.location);
+    assert_eq!(
+        Address {
+            sheet: 0,
+            row: 7,
+            col: 2
+        },
+        book.location
+    );
     assert_eq!(
         "1",
         book.get_current_cell_rendered()
@@ -85,14 +117,32 @@ fn test_book_insert_rows() {
 #[test]
 fn test_book_insert_columns() {
     let mut book = Book::default();
-    book.update_cell(&Address { sheet: 0, row: 2, col: 2 }, "1")
-        .expect("failed to edit cell");
-    book.move_to(&Address { sheet: 0, row: 2, col: 2 })
-        .expect("Failed to move to location");
+    book.update_cell(
+        &Address {
+            sheet: 0,
+            row: 2,
+            col: 2,
+        },
+        "1",
+    )
+    .expect("failed to edit cell");
+    book.move_to(&Address {
+        sheet: 0,
+        row: 2,
+        col: 2,
+    })
+    .expect("Failed to move to location");
     assert_eq!((2, 2), book.get_size().expect("Failed to get size"));
     book.insert_columns(1, 5).expect("Failed to insert rows");
     assert_eq!((2, 7), book.get_size().expect("Failed to get size"));
-    assert_eq!(Address { sheet: 0, row: 2, col: 7 }, book.location);
+    assert_eq!(
+        Address {
+            sheet: 0,
+            row: 2,
+            col: 7
+        },
+        book.location
+    );
     assert_eq!(
         "1",
         book.get_current_cell_rendered()
@@ -103,8 +153,15 @@ fn test_book_insert_columns() {
 #[test]
 fn test_book_col_size() {
     let mut book = Book::default();
-    book.update_cell(&Address { sheet: 0, row: 2, col: 2 }, "1")
-        .expect("failed to edit cell");
+    book.update_cell(
+        &Address {
+            sheet: 0,
+            row: 2,
+            col: 2,
+        },
+        "1",
+    )
+    .expect("failed to edit cell");
     book.set_col_size(1, 20).expect("Failed to set column size");
     assert_eq!(20, book.get_col_size(1).expect("Failed to get column size"));
 }
@@ -112,17 +169,34 @@ fn test_book_col_size() {
 #[test]
 fn test_book_get_exportable_rows() {
     let mut book = Book::default();
-    book.update_cell(&Address { sheet: 0, row: 1, col: 3 }, "1-3")
-        .expect("failed to edit cell");
-    book.update_cell(&Address { sheet: 0, row: 3, col: 6 }, "3-6")
-        .expect("failed to edit cell");
+    book.update_cell(
+        &Address {
+            sheet: 0,
+            row: 1,
+            col: 3,
+        },
+        "1-3",
+    )
+    .expect("failed to edit cell");
+    book.update_cell(
+        &Address {
+            sheet: 0,
+            row: 3,
+            col: 6,
+        },
+        "3-6",
+    )
+    .expect("failed to edit cell");
 
     let rows = book.get_export_rows().expect("Failed to get export rows");
     assert_eq!(4, rows.len());
-    assert_eq!(rows, vec![
-        vec!["", "" , "", "", "", "", ""],
-        vec!["", "" , "", "1-3", "", "", ""],
-        vec!["", "" , "", "", "", "", ""],
-        vec!["", "" , "", "", "", "", "3-6"],
-    ]);
+    assert_eq!(
+        rows,
+        vec![
+            vec!["", "", "", "", "", "", ""],
+            vec!["", "", "", "1-3", "", "", ""],
+            vec!["", "", "", "", "", "", ""],
+            vec!["", "", "", "", "", "", "3-6"],
+        ]
+    );
 }
diff --git a/src/ui/help/mod.rs b/src/ui/help/mod.rs
index 898253c..beaddf8 100644
--- a/src/ui/help/mod.rs
+++ b/src/ui/help/mod.rs
@@ -1,12 +1,11 @@
-use ratatui::text::Text;
-use tui_markdown;
+use crate::ui::render::markdown::Markdown;
 
-pub fn render_topic(topic: &str) -> Text<'static> {
+pub fn to_widget(topic: &str) -> Markdown {
     match topic {
-        "navigate" => tui_markdown::from_str(include_str!("../../../docs/navigation.md")),
-        "edit" => tui_markdown::from_str(include_str!("../../../docs/edit.md")),
-        "command" => tui_markdown::from_str(include_str!("../../../docs/command.md")),
-        "visual" => tui_markdown::from_str(include_str!("../../../docs/visual.md")),
-        _ => tui_markdown::from_str(include_str!("../../../docs/intro.md")),
+        "navigate" => Markdown::from_str(include_str!("../../../docs/navigation.md")),
+        "edit" => Markdown::from_str(include_str!("../../../docs/edit.md")),
+        "command" => Markdown::from_str(include_str!("../../../docs/command.md")),
+        "visual" => Markdown::from_str(include_str!("../../../docs/visual.md")),
+        _ => Markdown::from_str(include_str!("../../../docs/intro.md")),
     }
 }
diff --git a/src/ui/mod.rs b/src/ui/mod.rs
index 604064a..5bba2a0 100644
--- a/src/ui/mod.rs
+++ b/src/ui/mod.rs
@@ -7,19 +7,22 @@ use anyhow::{anyhow, Result};
 use crossterm::event::{self, Event, KeyCode, KeyEventKind, KeyModifiers};
 use ironcalc::base::{expressions::types::Area, Model};
 use ratatui::{
-    buffer::Buffer, layout::{Constraint, Flex, Layout}, style::{Modifier, Style}, text::{Line, Text}, widgets::Block
+    buffer::Buffer,
+    layout::{Constraint, Flex, Layout},
+    style::{Modifier, Style},
+    widgets::Block,
 };
 use tui_prompts::{State, Status, TextPrompt, TextState};
 use tui_textarea::{CursorMove, TextArea};
 
-mod help;
 mod cmd;
+mod help;
 pub mod render;
 #[cfg(test)]
 mod test;
 
 use cmd::Cmd;
-use render::viewport::ViewportState;
+use render::{markdown::Markdown, viewport::ViewportState};
 
 #[derive(Default, Debug, PartialEq, Clone)]
 pub enum Modality {
@@ -80,7 +83,7 @@ pub struct AppState<'ws> {
     pub range_select: RangeSelection,
     pub dialog_scroll: u16,
     dirty: bool,
-    popup: Text<'ws>,
+    popup: Option<Markdown>,
     clipboard: Option<ClipboardContents>,
 }
 
@@ -299,16 +302,16 @@ impl<'ws> Workspace<'ws> {
         Ok(None)
     }
 
-    fn render_help_text(&self) -> Text<'static> {
+    fn render_help_text(&self) -> Markdown {
         // TODO(zaphar): We should be sourcing these from our actual help documentation.
         // Ideally we would also render the markdown content properly.
         // https://github.com/zaphar/sheetsui/issues/22
         match self.state.modality() {
-            Modality::Navigate => help::render_topic("navigate"),
-            Modality::CellEdit => help::render_topic("edit"),
-            Modality::Command => help::render_topic("command"),
-            Modality::RangeSelect => help::render_topic("visual"),
-            _ => help::render_topic(""),
+            Modality::Navigate => help::to_widget("navigate"),
+            Modality::CellEdit => help::to_widget("edit"),
+            Modality::Command => help::to_widget("command"),
+            Modality::RangeSelect => help::to_widget("visual"),
+            _ => help::to_widget(""),
         }
     }
 
@@ -332,16 +335,16 @@ impl<'ws> Workspace<'ws> {
     fn handle_quit_dialog(&mut self, key: event::KeyEvent) -> Result<Option<ExitCode>> {
         if key.kind == KeyEventKind::Press {
             match key.code {
-                KeyCode::Esc | KeyCode::Char('n') | KeyCode::Char('N') =>  {
+                KeyCode::Esc | KeyCode::Char('n') | KeyCode::Char('N') => {
                     self.exit_quit_mode()?;
-                    return Ok(Some(ExitCode::SUCCESS))
-                },
+                    return Ok(Some(ExitCode::SUCCESS));
+                }
                 KeyCode::Char('y') | KeyCode::Char('Y') => {
                     // We have been asked to save the file first.
                     self.save_file()?;
                     self.exit_quit_mode()?;
                     return Ok(Some(ExitCode::SUCCESS));
-                },
+                }
                 _ => return Ok(None),
             }
         }
@@ -361,8 +364,10 @@ impl<'ws> Workspace<'ws> {
                 KeyCode::Char('k') | KeyCode::Up => {
                     self.state.dialog_scroll = self.state.dialog_scroll.saturating_sub(1);
                 }
-                _ => {
-                    // NOOP
+                code => {
+                    if let Some(widget) = &self.state.popup {
+                        widget.handle_input(code);
+                    }
                 }
             }
         }
@@ -414,7 +419,7 @@ impl<'ws> Workspace<'ws> {
                 Ok(None)
             }
             Ok(Some(Cmd::Help(maybe_topic))) => {
-                self.enter_dialog_mode(help::render_topic(maybe_topic.unwrap_or("")));
+                self.enter_dialog_mode(help::to_widget(maybe_topic.unwrap_or("")));
                 Ok(None)
             }
             Ok(Some(Cmd::Write(maybe_path))) => {
@@ -426,7 +431,8 @@ impl<'ws> Workspace<'ws> {
                 Ok(None)
             }
             Ok(Some(Cmd::ExportCsv(path))) => {
-                self.book.save_sheet_to_csv(self.book.location.sheet, path)?;
+                self.book
+                    .save_sheet_to_csv(self.book.location.sheet, path)?;
                 Ok(None)
             }
             Ok(Some(Cmd::InsertColumns(count))) => {
@@ -508,11 +514,14 @@ impl<'ws> Workspace<'ws> {
                 Ok(None)
             }
             Ok(None) => {
-                self.enter_dialog_mode(vec![Line::from(format!("Unrecognized commmand {}", cmd_text))]);
+                self.enter_dialog_mode(Markdown::from_str(&format!(
+                    "Unrecognized commmand {}",
+                    cmd_text
+                )));
                 Ok(None)
             }
             Err(msg) => {
-                self.enter_dialog_mode(vec![Line::from(msg.to_owned())]);
+                self.enter_dialog_mode(Markdown::from_str(msg));
                 Ok(None)
             }
         }
@@ -543,18 +552,12 @@ impl<'ws> Workspace<'ws> {
                 }
                 KeyCode::Char('D') => {
                     if let Some((start, end)) = self.state.range_select.get_range() {
-                        self.book.clear_cell_range_all(
-                            start,
-                            end,
-                        )?;
+                        self.book.clear_cell_range_all(start, end)?;
                     }
                 }
                 KeyCode::Char('d') => {
                     if let Some((start, end)) = self.state.range_select.get_range() {
-                        self.book.clear_cell_range(
-                            start,
-                            end,
-                        )?;
+                        self.book.clear_cell_range(start, end)?;
                     }
                 }
                 KeyCode::Char('h') => {
@@ -775,7 +778,11 @@ impl<'ws> Workspace<'ws> {
                 }
                 KeyCode::Char('l') if key.modifiers == KeyModifiers::CONTROL => {
                     self.run_with_prefix(|ws: &mut Workspace<'_>| -> Result<()> {
-                        let Address { sheet: _, row: _, col } = &ws.book.location;
+                        let Address {
+                            sheet: _,
+                            row: _,
+                            col,
+                        } = &ws.book.location;
                         ws.book
                             .set_col_size(*col, ws.book.get_col_size(*col)? + 1)?;
                         Ok(())
@@ -783,7 +790,11 @@ impl<'ws> Workspace<'ws> {
                 }
                 KeyCode::Char('h') if key.modifiers == KeyModifiers::CONTROL => {
                     self.run_with_prefix(|ws: &mut Workspace<'_>| -> Result<()> {
-                        let Address { sheet: _, row: _, col } = &ws.book.location;
+                        let Address {
+                            sheet: _,
+                            row: _,
+                            col,
+                        } = &ws.book.location;
                         let curr_size = ws.book.get_col_size(*col)?;
                         if curr_size > 1 {
                             ws.book.set_col_size(*col, curr_size - 1)?;
@@ -874,21 +885,31 @@ impl<'ws> Workspace<'ws> {
         return Ok(None);
     }
 
-    fn toggle_bool_style(&mut self, current_val: Option<bool>, path: &str, address: &Address) -> Result<(), anyhow::Error> {
+    fn toggle_bool_style(
+        &mut self,
+        current_val: Option<bool>,
+        path: &str,
+        address: &Address,
+    ) -> Result<(), anyhow::Error> {
         let value = if let Some(b_val) = current_val {
-            if b_val { "false" } else { "true" }
+            if b_val {
+                "false"
+            } else {
+                "true"
+            }
         } else {
             "true"
         };
         self.book.set_cell_style(
             &[(path, value)],
             &Area {
-            sheet: address.sheet,
-            row: address.row as i32,
-            column: address.col as i32,
-            width: 1,
-            height: 1,
-        })?;
+                sheet: address.sheet,
+                row: address.row as i32,
+                column: address.col as i32,
+                width: 1,
+                height: 1,
+            },
+        )?;
         Ok(())
     }
 
@@ -951,8 +972,8 @@ impl<'ws> Workspace<'ws> {
         self.state.command_state.focus();
     }
 
-    fn enter_dialog_mode<T: Into<Text<'ws>>>(&mut self, msg: T) {
-        self.state.popup = msg.into();
+    fn enter_dialog_mode(&mut self, msg: Markdown) {
+        self.state.popup = Some(msg);
         self.state.modality_stack.push(Modality::Dialog);
     }
 
@@ -981,7 +1002,7 @@ impl<'ws> Workspace<'ws> {
         self.state.pop_modality();
         Ok(None)
     }
-    
+
     fn exit_command_mode(&mut self) -> Result<Option<ExitCode>> {
         let cmd = self.state.command_state.value().to_owned();
         self.state.command_state.blur();
@@ -1045,14 +1066,13 @@ impl<'ws> Workspace<'ws> {
         self.book.save_to_xlsx(path.into().as_str())?;
         Ok(())
     }
-    
+
     fn quit_app(&mut self) -> std::result::Result<Option<ExitCode>, anyhow::Error> {
         if self.enter_quit_mode() {
             return Ok(None);
         }
-        return Ok(Some(ExitCode::SUCCESS))
+        return Ok(Some(ExitCode::SUCCESS));
     }
-
 }
 
 fn load_book(path: &PathBuf, locale: &str, tz: &str) -> Result<Book, anyhow::Error> {
diff --git a/src/ui/render/dialog.rs b/src/ui/render/dialog.rs
index 6c78612..c9bec90 100644
--- a/src/ui/render/dialog.rs
+++ b/src/ui/render/dialog.rs
@@ -11,6 +11,7 @@ pub struct Dialog<'w> {
     title: &'w str,
     bottom_title: &'w str,
     scroll: (u16, u16),
+    // TODO(zaphar): Have a max margin?
 }
 
 impl<'w> Dialog<'w> {
@@ -39,19 +40,29 @@ impl<'w> Widget for Dialog<'w> {
         Self: Sized,
     {
         // First find the center of the area.
-        let content_width = self.content.width();
-        let content_height = self.content.height();
-        let vertical_margin = if ((content_height as u16) + 2) <= area.height {
-            area.height.saturating_sub((content_height as u16) + 2).saturating_div(2)
+        let content_width = 120 + 2;
+        let content_height = (self.content.height() + 2) as u16;
+        let vertical_margin = if content_height <= area.height {
+            area.height
+                .saturating_sub(content_height as u16)
+                .saturating_div(2)
         } else {
-            area.height - 2
+            2
+        };
+        let horizontal_margin = if content_width <= area.width {
+            area
+            .width
+            .saturating_sub(content_width as u16)
+            .saturating_div(2)
+        } else {
+           2
         };
-        let horizontal_margin = area.width.saturating_sub((content_width as u16) + 2).saturating_div(2);
         let [_, dialog_vertical, _] = Layout::vertical(vec![
             Constraint::Length(vertical_margin),
             Constraint::Fill(1),
             Constraint::Length(vertical_margin),
-        ]).areas(area);
+        ])
+        .areas(area);
         let [_, dialog_area, _] = Layout::horizontal(vec![
             Constraint::Length(horizontal_margin),
             Constraint::Fill(1),
diff --git a/src/ui/render/markdown.rs b/src/ui/render/markdown.rs
new file mode 100644
index 0000000..bedee6f
--- /dev/null
+++ b/src/ui/render/markdown.rs
@@ -0,0 +1,536 @@
+use std::collections::BTreeSet;
+
+use crossterm::event::KeyCode;
+use ratatui::{
+    style::{Color, Modifier, Style},
+    text::{Line, Span, Text},
+    widgets::Widget,
+};
+
+use pulldown_cmark::{Event, LinkType, Parser, Tag, TagEnd};
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct Markdown {
+    input: String,
+    links: BTreeSet<String>,
+    parsed_text: Option<Text<'static>>,
+}
+
+/// Define the different states a markdown parser can be in
+#[derive(Debug, Clone, PartialEq)]
+enum MarkdownState {
+    Normal,
+    Heading(pulldown_cmark::HeadingLevel),
+    Strong,
+    Emphasis,
+    Code,
+    List(ListState),
+}
+
+/// Track list state including nesting level and type
+#[derive(Debug, Clone, PartialEq)]
+struct ListState {
+    list_type: ListType,
+    nesting_level: usize,
+    item_number: usize,
+}
+
+#[derive(Debug, Clone, PartialEq)]
+enum ListType {
+    Ordered,
+    Unordered,
+}
+
+impl Markdown {
+    pub fn from_str(input: &str) -> Self {
+        let mut me = Self {
+            input: input.to_owned(),
+            links: Default::default(),
+            parsed_text: None,
+        };
+        me.parse();
+        me
+    }
+
+    fn parse(&mut self) {
+        let input = self.input.clone();
+        
+        let parser = pulldown_cmark::TextMergeStream::new(Parser::new(&input));
+
+        let mut current_line = Line::default();
+        let mut lines: Vec<Line> = Vec::new();
+        let mut state_stack: Vec<MarkdownState> = vec![MarkdownState::Normal];
+
+        for event in parser {
+            match event {
+                Event::Start(tag) => {
+                    match &tag {
+                        Tag::Heading { level, .. } => {
+                            if !current_line.spans.is_empty() {
+                                lines.push(current_line);
+                            }
+
+                            // Add heading style based on level
+                            let heading_style = match level {
+                                pulldown_cmark::HeadingLevel::H1 => {
+                                    Style::default().add_modifier(Modifier::BOLD)
+                                }
+                                pulldown_cmark::HeadingLevel::H2 => {
+                                    Style::default().add_modifier(Modifier::ITALIC)
+                                }
+                                _ => Style::default().fg(Color::Blue),
+                            };
+                            current_line = Line::styled("", heading_style);
+                            state_stack.push(MarkdownState::Heading(*level));
+                        }
+                        Tag::Paragraph => {
+                            if !current_line.spans.is_empty() {
+                                lines.push(current_line);
+                                current_line = Line::default();
+                            }
+                        }
+                        Tag::Strong => {
+                            state_stack.push(MarkdownState::Strong);
+                        }
+                        Tag::Emphasis => {
+                            state_stack.push(MarkdownState::Emphasis);
+                        }
+                        Tag::CodeBlock(_) => {
+                            state_stack.push(MarkdownState::Code);
+                        }
+                        Tag::List(list_type) => {
+                            if !current_line.spans.is_empty() {
+                                lines.push(current_line);
+                                current_line = Line::default();
+                            }
+
+                            // Determine list type and nesting level
+                            let list_type = match list_type {
+                                Some(_) => ListType::Ordered,
+                                None => ListType::Unordered,
+                            };
+
+                            // Calculate nesting level based on existing lists in the stack
+                            let nesting_level = state_stack
+                                .iter()
+                                .filter(|state| matches!(state, MarkdownState::List(_)))
+                                .count();
+
+                            state_stack.push(MarkdownState::List(ListState {
+                                list_type,
+                                nesting_level,
+                                item_number: 0,
+                            }));
+                        }
+                        Tag::Item => {
+                            if !current_line.spans.is_empty() {
+                                lines.push(current_line);
+                                current_line = Line::default();
+                            }
+
+                            // Find the current list state and increment its item number
+                            for state in state_stack.iter_mut().rev() {
+                                if let MarkdownState::List(list_state) = state {
+                                    list_state.item_number += 1;
+
+                                    // Add appropriate indentation based on nesting level
+                                    let indent = "  ".repeat(list_state.nesting_level);
+
+                                    // Add appropriate marker based on list type
+                                    let marker = match list_state.list_type {
+                                        ListType::Unordered => "* ".to_string(),
+                                        ListType::Ordered => {
+                                            format!("{}. ", list_state.item_number)
+                                        }
+                                    };
+
+                                    current_line
+                                        .spans
+                                        .push(Span::raw(format!("{}{}", indent, marker)));
+                                    break;
+                                }
+                            }
+                        }
+                        Tag::Link {
+                            link_type: _,
+                            dest_url: _,
+                            title: _,
+                            id: _,
+                        } => {
+                            self.handle_link_tag(&tag);
+                        }
+                        Tag::BlockQuote(_) => todo!(),
+                        Tag::Strikethrough => todo!(),
+                        Tag::Superscript => todo!(),
+                        Tag::Subscript => todo!(),
+                        _ => {
+                            // noop
+                        }
+                    }
+                }
+                Event::End(tag) => {
+                    match tag {
+                        TagEnd::Heading { .. } => {
+                            lines.push(current_line);
+                            lines.push(Line::default()); // Add empty line after heading
+                            current_line = Line::default();
+                            state_stack.pop();
+                        }
+                        TagEnd::Paragraph => {
+                            lines.push(current_line);
+                            lines.push(Line::default()); // Add empty line after paragraph
+                            current_line = Line::default();
+                        }
+                        TagEnd::Strong => {
+                            state_stack.pop();
+                        }
+                        TagEnd::Emphasis => {
+                            state_stack.pop();
+                        }
+                        TagEnd::CodeBlock => {
+                            state_stack.pop();
+                        }
+                       TagEnd::Item => {
+                            // Push the current line to preserve the list item
+                            if !current_line.spans.is_empty() {
+                                lines.push(current_line);
+                                current_line = Line::default();
+                            }
+                        }
+                        TagEnd::List(_) => {
+                            state_stack.pop();
+
+                            // Only add an empty line if we're back to the root level
+                            if state_stack
+                                .iter()
+                                .filter(|state| matches!(state, MarkdownState::List(_))).count() == 0
+                            {
+                                //lines.push(Line::default()); // Add empty line after list
+                            }
+                        }
+                        _ => {}
+                    }
+                }
+                Event::InlineMath(text) 
+                | Event::Code(text)
+                | Event::InlineHtml(text)
+                | Event::DisplayMath(text)
+                | Event::Html(text)
+                | Event::Text(text) => {
+                    let mut style = Style::default();
+
+                    // Apply style based on current state
+                    for state in state_stack.iter().rev() {
+                        match state {
+                            MarkdownState::Heading(_) => {
+                                // Style already applied to the line
+                                break;
+                            }
+                            MarkdownState::Strong => {
+                                style = style.add_modifier(Modifier::BOLD);
+                            }
+                            MarkdownState::Emphasis => {
+                                style = style.add_modifier(Modifier::ITALIC);
+                            }
+                            //MarkdownState::Code => {
+                            //    style = style.fg(Color::Yellow);
+                            //}
+                            _ => {
+                            }
+                        }
+                    }
+
+                    // Add the text with appropriate styling
+                    current_line
+                        .spans
+                        .push(Span::styled(text.to_string(), style));
+                }
+                Event::SoftBreak => {
+                    current_line.spans.push(Span::raw(" "));
+                }
+                Event::HardBreak => {
+                    lines.push(current_line);
+                    current_line = Line::default();
+                }
+                Event::FootnoteReference(_) => {},
+                Event::Rule => {},
+                Event::TaskListMarker(_) => {},
+            }
+        }
+
+        // Add any remaining content
+        if !current_line.spans.is_empty() {
+            lines.push(current_line);
+        }
+
+        self.parsed_text = Some(Text::from(lines));
+    }
+
+    fn handle_link_tag(&mut self, tag: &Tag<'_>) {
+        match tag {
+            Tag::Link {
+                link_type,
+                dest_url,
+                title,
+                id,
+            } => {
+                let dest = match link_type {
+                    // [foo](bar)
+                    LinkType::Inline => format!("({})", dest_url),
+                    // [foo][bar]
+                    LinkType::Reference => format!("[{}]", id),
+                    // [foo]
+                    LinkType::Shortcut => format!("[{}]", title),
+                    // These are unsupported right now
+                    LinkType::ReferenceUnknown => String::from("[unknown]"),
+                    LinkType::Collapsed => String::from("[collapsed]"),
+                    LinkType::CollapsedUnknown => String::from("[collapsed unknown]"),
+                    LinkType::ShortcutUnknown => String::from("[shortcut unknown]"),
+                    LinkType::Autolink => dest_url.to_string(),
+                    LinkType::Email => dest_url.to_string(),
+                    LinkType::WikiLink { has_pothole: _ } => String::from("[wiki]"),
+                };
+                self.links.insert(dest);
+            }
+            _ => { /* noop */ }
+        }
+    }
+
+    pub fn handle_input(&self, code: KeyCode) -> Option<String> {
+        let num = match code {
+            KeyCode::Char('0') => 0,
+            KeyCode::Char('1') => 1,
+            KeyCode::Char('2') => 2,
+            KeyCode::Char('3') => 3,
+            KeyCode::Char('4') => 4,
+            KeyCode::Char('5') => 5,
+            KeyCode::Char('6') => 6,
+            KeyCode::Char('7') => 7,
+            KeyCode::Char('8') => 8,
+            KeyCode::Char('9') => 9,
+            _ => return None,
+        };
+        self.links.iter().nth(num).cloned()
+    }
+
+    pub fn get_text(&self) -> Text {
+        if let Some(ref parsed) = self.parsed_text {
+            parsed.clone()
+        } else {
+            Text::raw(&self.input)
+        }
+    }
+}
+
+impl Widget for Markdown {
+    fn render(self, area: ratatui::prelude::Rect, buf: &mut ratatui::prelude::Buffer)
+    where
+        Self: Sized,
+    {
+        if let Some(parsed) = self.parsed_text {
+            parsed.render(area, buf);
+        } else {
+            let text = Text::raw(self.input);
+            text.render(area, buf);
+        }
+    }
+}
+
+// TODO(zaphar): Move this into a proper test file.
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_empty_markdown() {
+        let md = Markdown::from_str("");
+        let text = md.get_text();
+        assert_eq!(text.lines.len(), 0);
+    }
+
+    #[test]
+    fn test_simple_paragraph() {
+        let md = Markdown::from_str("This is a simple paragraph.");
+        let text = md.get_text();
+        assert_eq!(text.lines.len(), 2); // Paragraph + empty line
+        assert_eq!(text.lines[0].spans[0].content, "This is a simple paragraph.");
+    }
+
+    #[test]
+    fn test_headings() {
+        let md = Markdown::from_str("# Heading 1\n## Heading 2\n### Heading 3");
+        let text = md.get_text();
+        
+        // Should have 3 headings and 6 lines
+        assert_eq!(text.lines.len(), 6);
+        
+        // Check content
+        assert_eq!(text.lines[0].spans[0].content, "Heading 1");
+        assert_eq!(text.lines[1].spans.len(), 0);
+        assert_eq!(text.lines[2].spans[0].content, "Heading 2");
+        assert_eq!(text.lines[3].spans.len(), 0);
+        assert_eq!(text.lines[4].spans[0].content, "Heading 3");
+        assert_eq!(text.lines[5].spans.len(), 0);
+        
+        assert!(text.lines[0].style != text.lines[1].style);
+    }
+
+    #[test]
+    fn test_emphasis() {
+        let md = Markdown::from_str("Normal *italic* **bold** text");
+        let text = md.get_text();
+        
+        assert_eq!(text.lines.len(), 2); // Paragraph + empty line
+        
+        // Check spans - should have 4 spans: normal, italic, bold, normal
+        assert_eq!(text.lines[0].spans.len(), 5);
+        assert_eq!(text.lines[0].spans[0].content, "Normal ");
+        assert_eq!(text.lines[0].spans[1].content, "italic");
+        assert_eq!(text.lines[0].spans[2].content, " ");
+        assert_eq!(text.lines[0].spans[3].content, "bold");
+        assert_eq!(text.lines[0].spans[4].content, " text");
+        
+        // Check that styles are different
+        assert!(text.lines[0].spans[0].style != text.lines[0].spans[1].style);
+        assert!(text.lines[0].spans[1].style != text.lines[0].spans[2].style);
+    }
+
+    #[test]
+    fn test_unordered_list() {
+        let md = Markdown::from_str("* Item 1\n* Item 2\n* Item 3");
+        let text = md.get_text();
+        
+        // Should have 4 lines: 3 items + empty line after list
+        assert_eq!(text.lines.len(), 3);
+        
+        // Check content with markers
+        assert_eq!(text.lines[0].spans[0].content, "* ");
+        assert_eq!(text.lines[0].spans[1].content, "Item 1");
+        
+        assert_eq!(text.lines[1].spans[0].content, "* ");
+        assert_eq!(text.lines[1].spans[1].content, "Item 2");
+        
+        assert_eq!(text.lines[2].spans[0].content, "* ");
+        assert_eq!(text.lines[2].spans[1].content, "Item 3");
+    }
+
+    #[test]
+    fn test_ordered_list() {
+        let md = Markdown::from_str("1. First item\n2. Second item\n3. Third item");
+        let text = md.get_text();
+        
+        // Should have 4 lines: 3 items + empty line after list
+        assert_eq!(text.lines.len(), 3);
+        
+        // Check content with markers
+        assert_eq!(text.lines[0].spans[0].content, "1. ");
+        assert_eq!(text.lines[0].spans[1].content, "First item");
+        
+        assert_eq!(text.lines[1].spans[0].content, "2. ");
+        assert_eq!(text.lines[1].spans[1].content, "Second item");
+        
+        assert_eq!(text.lines[2].spans[0].content, "3. ");
+        assert_eq!(text.lines[2].spans[1].content, "Third item");
+    }
+
+    #[test]
+    fn test_nested_lists() {
+        let md = Markdown::from_str("* Item 1\n  * Nested 1\n  * Nested 2\n* Item 2");
+        let text = md.get_text();
+        
+        // Should have 5 lines: 4 items + empty line after list
+        assert_eq!(text.lines.len(), 4);
+        
+        // Check indentation and markers
+        assert_eq!(text.lines[0].spans[0].content, "* ");
+        assert_eq!(text.lines[0].spans[1].content, "Item 1");
+        
+        assert_eq!(text.lines[1].spans[0].content, "  * ");
+        assert_eq!(text.lines[1].spans[1].content, "Nested 1");
+        
+        assert_eq!(text.lines[2].spans[0].content, "  * ");
+        assert_eq!(text.lines[2].spans[1].content, "Nested 2");
+        
+        assert_eq!(text.lines[3].spans[0].content, "* ");
+        assert_eq!(text.lines[3].spans[1].content, "Item 2");
+    }
+
+    #[test]
+    fn test_mixed_list_types() {
+        let md = Markdown::from_str("1. First\n   * Nested bullet\n2. Second");
+        let text = md.get_text();
+        
+        // Should have 4 lines: 3 items + empty line after list
+        assert_eq!(text.lines.len(), 3);
+        
+        assert_eq!(text.lines[0].spans[0].content, "1. ");
+        assert_eq!(text.lines[0].spans[1].content, "First");
+        
+        assert_eq!(text.lines[1].spans[0].content, "  * ");
+        assert_eq!(text.lines[1].spans[1].content, "Nested bullet");
+        
+        assert_eq!(text.lines[2].spans[0].content, "2. ");
+        assert_eq!(text.lines[2].spans[1].content, "Second");
+    }
+
+    #[test]
+    fn test_links() {
+        let md = Markdown::from_str("[Link text](https://example.com)");
+        let text = md.get_text();
+        
+        // Should have 2 lines: paragraph + empty line
+        assert_eq!(text.lines.len(), 2);
+        
+        // Check link text is rendered
+        assert_eq!(text.lines[0].spans[0].content, "Link text");
+        
+        // Check link is stored
+        assert!(md.links.contains(&String::from("(https://example.com)")));
+    }
+
+    #[test]
+    fn test_handle_input() {
+        let md = Markdown::from_str("[Link 1](https://example1.com)\n[Link 2](https://example2.com)");
+        
+        // Test valid key input
+        let link1 = md.handle_input(KeyCode::Char('0'));
+        let link2 = md.handle_input(KeyCode::Char('1'));
+        
+        assert!(link1.is_some());
+        assert!(link2.is_some());
+        
+        // Test invalid key input
+        let invalid = md.handle_input(KeyCode::Enter);
+        assert!(invalid.is_none());
+    }
+
+    #[test]
+    fn test_complex_document() {
+        let markdown = r#"
+# Main Heading
+
+This is a paragraph with *italic* and **bold** text.
+
+## Subheading
+
+* List item 1
+* List item 2
+  * Nested item 1
+  * Nested item 2
+* List item 3
+
+1. Ordered item 1
+2. Ordered item 2
+
+[Link to example](https://example.com)
+"#;
+        
+        let md = Markdown::from_str(markdown);
+        let text = md.get_text();
+        
+        // Basic validation that parsing worked
+        assert!(text.lines.len() > 10);
+        
+        // Check link is stored
+        assert!(md.links.contains(&String::from("(https://example.com)")));
+    }
+}
diff --git a/src/ui/render/mod.rs b/src/ui/render/mod.rs
index 8984c6e..162d710 100644
--- a/src/ui/render/mod.rs
+++ b/src/ui/render/mod.rs
@@ -11,6 +11,7 @@ use super::*;
 pub mod viewport;
 pub use viewport::Viewport;
 pub mod dialog;
+pub mod markdown;
 
 #[cfg(test)]
 mod test;
@@ -99,12 +100,18 @@ impl<'widget, 'ws: 'widget> Widget for &'widget mut Workspace<'ws> {
         Self: Sized,
     {
         if self.state.modality() == &Modality::Dialog {
-            let lines = Text::from_iter(self.state.popup.iter().cloned());
+            let lines = self
+                .state
+                .popup
+                .as_ref()
+                .map(|md| md.get_text())
+                .unwrap_or_else(|| Text::raw("Popup message here"));
             let popup = dialog::Dialog::new(lines, "Help").scroll(self.state.dialog_scroll);
             popup.render(area, buf);
         } else if self.state.modality() == &Modality::Quit {
-            let popup = dialog::Dialog::new(Text::raw("File is not yet saved. Save it first?"), "Quit")
-                .with_bottom_title("Y/N");
+            let popup =
+                dialog::Dialog::new(Text::raw("File is not yet saved. Save it first?"), "Quit")
+                    .with_bottom_title("Y/N");
             popup.render(area, buf);
         } else {
             let outer_block = Block::bordered()
diff --git a/src/ui/render/test.rs b/src/ui/render/test.rs
index a37994d..a92bb2f 100644
--- a/src/ui/render/test.rs
+++ b/src/ui/render/test.rs
@@ -14,8 +14,11 @@ fn test_viewport_get_visible_columns() {
     let default_size = book.get_col_size(1).expect("Failed to get column size");
     let width = default_size * 12 / 2;
     let app_state = AppState::default();
-    let viewport = Viewport::new(&book, Some(&app_state.range_select))
-        .with_selected(Address { sheet: 0, row: 1, col: 17 });
+    let viewport = Viewport::new(&book, Some(&app_state.range_select)).with_selected(Address {
+        sheet: 0,
+        row: 1,
+        col: 17,
+    });
     let cols = viewport
         .get_visible_columns((width + 5) as u16, &mut state)
         .expect("Failed to get visible columns");
@@ -31,8 +34,11 @@ fn test_viewport_get_visible_rows() {
     );
     let height = 6;
     let app_state = AppState::default();
-    let viewport = Viewport::new(&book, Some(&app_state.range_select))
-        .with_selected(Address { sheet: 0, row: 17, col: 1 });
+    let viewport = Viewport::new(&book, Some(&app_state.range_select)).with_selected(Address {
+        sheet: 0,
+        row: 17,
+        col: 1,
+    });
     let rows = viewport.get_visible_rows(height as u16, &mut state);
     assert_eq!(height - 1, rows.len());
     assert_eq!(
@@ -52,8 +58,11 @@ fn test_viewport_visible_columns_after_length_change() {
     let width = default_size * 12 / 2;
     {
         let app_state = AppState::default();
-        let viewport = Viewport::new(&book, Some(&app_state.range_select))
-            .with_selected(Address { sheet: 0, row: 1, col: 17 });
+        let viewport = Viewport::new(&book, Some(&app_state.range_select)).with_selected(Address {
+            sheet: 0,
+            row: 1,
+            col: 17,
+        });
         let cols = viewport
             .get_visible_columns((width + 5) as u16, &mut state)
             .expect("Failed to get visible columns");
@@ -65,8 +74,11 @@ fn test_viewport_visible_columns_after_length_change() {
         .expect("Failed to set column size");
     {
         let app_state = AppState::default();
-        let viewport = Viewport::new(&book, Some(&app_state.range_select))
-            .with_selected(Address { sheet: 0, row: 1, col: 1 });
+        let viewport = Viewport::new(&book, Some(&app_state.range_select)).with_selected(Address {
+            sheet: 0,
+            row: 1,
+            col: 1,
+        });
         let cols = viewport
             .get_visible_columns((width + 5) as u16, &mut state)
             .expect("Failed to get visible columns");
diff --git a/src/ui/render/viewport.rs b/src/ui/render/viewport.rs
index 1c74084..0e29a73 100644
--- a/src/ui/render/viewport.rs
+++ b/src/ui/render/viewport.rs
@@ -7,8 +7,8 @@ use ratatui::{
     widgets::{Block, Cell, Row, StatefulWidget, Table, Widget},
 };
 
-use crate::book;
 use super::{Address, Book, RangeSelection};
+use crate::book;
 
 /// A visible column to show in our Viewport.
 #[derive(Clone, Debug)]
@@ -150,7 +150,11 @@ impl<'ws> Viewport<'ws> {
                         |VisibleColumn { idx: ci, length: _ }| {
                             let content = self
                                 .book
-                                .get_cell_addr_rendered(&Address { row: ri, col: *ci, sheet: self.book.location.sheet})
+                                .get_cell_addr_rendered(&Address {
+                                    row: ri,
+                                    col: *ci,
+                                    sheet: self.book.location.sheet,
+                                })
                                 .unwrap();
                             self.compute_cell_style(ri, *ci, Cell::new(Text::raw(content)))
                         },
@@ -192,29 +196,27 @@ impl<'ws> Viewport<'ws> {
         mut cell: Cell<'widget>,
     ) -> Cell<'widget> {
         // TODO(zaphar): Should probably create somekind of formatter abstraction.
-        if let Some(style) = self
-            .book
-            .get_cell_style(&Address { sheet: self.book.location.sheet, row: ri, col: ci }) {
+        if let Some(style) = self.book.get_cell_style(&Address {
+            sheet: self.book.location.sheet,
+            row: ri,
+            col: ci,
+        }) {
             cell = self.compute_cell_colors(&style, ri, ci, cell);
-            cell = if style.font.b {
-                cell.bold()
-            } else { cell };
-            cell = if style.font.i {
-                cell.italic()
-            } else { cell };
+            cell = if style.font.b { cell.bold() } else { cell };
+            cell = if style.font.i { cell.italic() } else { cell };
         }
         cell
     }
 
-    fn compute_cell_colors<'widget>(&self, style: &ironcalc::base::types::Style, ri: usize, ci: usize, mut cell: Cell<'widget>) -> Cell<'widget> {
-        let bg_color = map_color(
-            style.fill.bg_color.as_ref(),
-            Color::Rgb(35, 33, 54),
-        );
-        let fg_color = map_color(
-            style.fill.fg_color.as_ref(),
-            Color::White,
-        );
+    fn compute_cell_colors<'widget>(
+        &self,
+        style: &ironcalc::base::types::Style,
+        ri: usize,
+        ci: usize,
+        mut cell: Cell<'widget>,
+    ) -> Cell<'widget> {
+        let bg_color = map_color(style.fill.bg_color.as_ref(), Color::Rgb(35, 33, 54));
+        let fg_color = map_color(style.fill.fg_color.as_ref(), Color::White);
         if let Some((start, end)) = &self.range_selection.map_or(None, |r| r.get_range()) {
             if ri >= start.row && ri <= end.row && ci >= start.col && ci <= end.col {
                 // This is a selected range
diff --git a/src/ui/test.rs b/src/ui/test.rs
index d75bf28..cb9c0a9 100644
--- a/src/ui/test.rs
+++ b/src/ui/test.rs
@@ -395,7 +395,7 @@ macro_rules! assert_help_dialog {
             .run(&mut ws)
             .expect("Failed to handle 'alt-h' key event");
         assert_eq!(Some(&Modality::Dialog), ws.state.modality_stack.last());
-        assert_eq!(edit_help, ws.state.popup);
+        assert_eq!(Some(edit_help), ws.state.popup);
         $exit.run(&mut ws).expect("Failed to handle key event");
         assert_eq!(Some(&Modality::CellEdit), ws.state.modality_stack.last());
     }};
@@ -431,7 +431,7 @@ fn test_navigation_mode_help_keycode() {
         .run(&mut ws)
         .expect("Failed to handle 'alt-h' key event");
     assert_eq!(Some(&Modality::Dialog), ws.state.modality_stack.last());
-    assert_eq!(help_text, ws.state.popup);
+    assert_eq!(Some(help_text), ws.state.popup);
 }
 
 #[test]
@@ -449,7 +449,7 @@ fn test_command_mode_help_keycode() {
         .run(&mut ws)
         .expect("Failed to handle 'alt-h' key event");
     assert_eq!(Some(&Modality::Dialog), ws.state.modality_stack.last());
-    assert_eq!(edit_help, ws.state.popup);
+    assert_eq!(Some(edit_help), ws.state.popup);
 }
 
 #[test]
@@ -554,9 +554,7 @@ fn test_range_copy() {
     assert_eq!(Some(&Modality::Navigate), ws.state.modality_stack.last());
 
     let address = Address::default();
-    ws.book
-        .move_to(&address)
-        .expect("Failed to move to row");
+    ws.book.move_to(&address).expect("Failed to move to row");
     let original_loc = ws.book.location.clone();
     script()
         .ctrl('r')
@@ -576,7 +574,11 @@ fn test_range_copy() {
         .run(&mut ws)
         .expect("Failed to handle key sequence");
     assert_eq!(
-        Some(Address { sheet: 0, row: 1, col: 2 }),
+        Some(Address {
+            sheet: 0,
+            row: 1,
+            col: 2
+        }),
         ws.state.range_select.start
     );
 
@@ -588,18 +590,40 @@ fn test_range_copy() {
 
     assert!(ws.state.range_select.original_location.is_none());
     assert_eq!(
-        Some(Address { sheet: 0, row: 1, col: 2 }),
+        Some(Address {
+            sheet: 0,
+            row: 1,
+            col: 2
+        }),
         ws.state.range_select.start
     );
-    assert_eq!(Some(Address { sheet: 0, row: 2, col: 2 }), ws.state.range_select.end);
+    assert_eq!(
+        Some(Address {
+            sheet: 0,
+            row: 2,
+            col: 2
+        }),
+        ws.state.range_select.end
+    );
     assert_eq!(original_loc, ws.book.location);
     assert_eq!(Some(&Modality::Navigate), ws.state.modality_stack.last());
 
     ws.book
-        .move_to(&Address { sheet: 0, row: 5, col: 5 })
+        .move_to(&Address {
+            sheet: 0,
+            row: 5,
+            col: 5,
+        })
         .expect("Failed to move to row");
     let original_loc_2 = ws.book.location.clone();
-    assert_eq!(Address { sheet: 0, row: 5, col: 5 }, original_loc_2);
+    assert_eq!(
+        Address {
+            sheet: 0,
+            row: 5,
+            col: 5
+        },
+        original_loc_2
+    );
 
     script()
         .char('v')
@@ -619,7 +643,11 @@ fn test_range_copy() {
         .run(&mut ws)
         .expect("Failed to handle key sequence");
     assert_eq!(
-        Some(Address { sheet: 0, row: 5, col: 5 }),
+        Some(Address {
+            sheet: 0,
+            row: 5,
+            col: 5
+        }),
         ws.state.range_select.start
     );
 
@@ -631,11 +659,29 @@ fn test_range_copy() {
 
     assert!(ws.state.range_select.original_location.is_none());
     assert_eq!(
-        Some(Address { sheet: 0, row: 5, col: 5 }),
+        Some(Address {
+            sheet: 0,
+            row: 5,
+            col: 5
+        }),
         ws.state.range_select.start
     );
-    assert_eq!(Some(Address { sheet: 0, row: 5, col: 4 }), ws.state.range_select.end);
-    assert_eq!(Address { sheet: 0, row: 4, col: 5 }, ws.book.location);
+    assert_eq!(
+        Some(Address {
+            sheet: 0,
+            row: 5,
+            col: 4
+        }),
+        ws.state.range_select.end
+    );
+    assert_eq!(
+        Address {
+            sheet: 0,
+            row: 4,
+            col: 5
+        },
+        ws.book.location
+    );
     assert_eq!(Some(&Modality::Navigate), ws.state.modality_stack.last());
 }
 
@@ -664,14 +710,28 @@ fn test_gg_movement() {
         .char('j')
         .run(&mut ws)
         .expect("failed to handle event sequence");
-    assert_eq!(ws.book.location, Address { sheet: 0, row: 3, col: 1 });
+    assert_eq!(
+        ws.book.location,
+        Address {
+            sheet: 0,
+            row: 3,
+            col: 1
+        }
+    );
     script()
         .char('l')
         .char('g')
         .char('g')
         .run(&mut ws)
         .expect("failed to handle event sequence");
-    assert_eq!(ws.book.location, Address { sheet: 0, row: 1, col: 2 });
+    assert_eq!(
+        ws.book.location,
+        Address {
+            sheet: 0,
+            row: 1,
+            col: 2
+        }
+    );
 }
 
 #[test]
@@ -684,14 +744,28 @@ fn test_h_j_k_l_movement() {
         .char('l')
         .run(&mut ws)
         .expect("failed to handle event sequence");
-    assert_eq!(ws.book.location, Address { sheet: 0, row: 3, col: 2 });
+    assert_eq!(
+        ws.book.location,
+        Address {
+            sheet: 0,
+            row: 3,
+            col: 2
+        }
+    );
     script()
         .char('h')
         .char('2')
         .char('k')
         .run(&mut ws)
         .expect("failed to handle event sequence");
-    assert_eq!(ws.book.location, Address { sheet: 0, row: 1, col: 1 });
+    assert_eq!(
+        ws.book.location,
+        Address {
+            sheet: 0,
+            row: 1,
+            col: 1
+        }
+    );
 }
 
 macro_rules! assert_copy_paste {
@@ -930,8 +1004,16 @@ fn test_command_mode_enter() {
 fn test_edit_mode_paste() {
     let mut ws = new_workspace();
     assert_eq!(Some(&Modality::Navigate), ws.state.modality_stack.last());
-    ws.state.range_select.start = Some(Address { sheet: 0, row: 1, col: 1 });
-    ws.state.range_select.end = Some(Address { sheet: 0, row: 2, col: 2 });
+    ws.state.range_select.start = Some(Address {
+        sheet: 0,
+        row: 1,
+        col: 1,
+    });
+    ws.state.range_select.end = Some(Address {
+        sheet: 0,
+        row: 2,
+        col: 2,
+    });
     script()
         .char('e')
         .ctrl('p')
@@ -979,8 +1061,16 @@ macro_rules! assert_range_clear {
     ($script : expr) => {{
         let mut ws = new_workspace();
         assert_eq!(Some(&Modality::Navigate), ws.state.modality_stack.last());
-        let first_corner = Address { sheet: 0, row: 1, col: 1 };
-        let second_corner = Address { sheet: 0, row: 2, col: 2 };
+        let first_corner = Address {
+            sheet: 0,
+            row: 1,
+            col: 1,
+        };
+        let second_corner = Address {
+            sheet: 0,
+            row: 2,
+            col: 2,
+        };
         ws.book
             .update_cell(&first_corner, "foo")
             .expect("Failed to update cell");
@@ -1050,7 +1140,14 @@ fn test_range_select_movement() {
         .char('k')
         .run(&mut ws)
         .expect("failed to run script");
-    assert_eq!(&Address { sheet: 0, row: 3, col: 3 }, &ws.book.location);
+    assert_eq!(
+        &Address {
+            sheet: 0,
+            row: 3,
+            col: 3
+        },
+        &ws.book.location
+    );
     script()
         .ctrl('n')
         .run(&mut ws)
@@ -1071,8 +1168,16 @@ fn test_range_select_clear_lower_d() {
 macro_rules! assert_range_copy {
     ($script: expr) => {{
         let mut ws = new_workspace();
-        let top_left_addr = Address { sheet: 0, row: 2, col: 2 };
-        let bot_right_addr = Address { sheet: 0, row: 4, col: 4 };
+        let top_left_addr = Address {
+            sheet: 0,
+            row: 2,
+            col: 2,
+        };
+        let bot_right_addr = Address {
+            sheet: 0,
+            row: 4,
+            col: 4,
+        };
         ws.book
             .update_cell(&top_left_addr, "top_left")
             .expect("Failed to update top left");
@@ -1111,7 +1216,11 @@ macro_rules! assert_range_copy {
                 .expect("Didn't find a start of range")
         );
         assert_eq!(
-            &Address { sheet: 0, row: 1, col: 1 },
+            &Address {
+                sheet: 0,
+                row: 1,
+                col: 1
+            },
             ws.state
                 .range_select
                 .original_location
@@ -1179,7 +1288,11 @@ fn test_extend_to_range() {
         .expect("Unable to run script");
     let extended_cell = ws
         .book
-        .get_cell_addr_contents(&Address { sheet: 0, row: 2, col: 1 })
+        .get_cell_addr_contents(&Address {
+            sheet: 0,
+            row: 2,
+            col: 1,
+        })
         .expect("Failed to get cell contents");
     assert_eq!("=B2+1".to_string(), extended_cell);
 }
@@ -1199,7 +1312,11 @@ fn test_color_cells() {
         for ci in 1..=3 {
             let style = ws
                 .book
-                .get_cell_style(&Address { sheet: ws.book.location.sheet, row: ri, col: ci })
+                .get_cell_style(&Address {
+                    sheet: ws.book.location.sheet,
+                    row: ri,
+                    col: ci,
+                })
                 .expect("failed to get style");
             assert_eq!(
                 "#800000",
@@ -1225,7 +1342,11 @@ fn test_color_row() {
     for ci in [1, book::LAST_COLUMN] {
         let style = ws
             .book
-            .get_cell_style(&Address { sheet: ws.book.location.sheet, row: 1, col: ci as usize })
+            .get_cell_style(&Address {
+                sheet: ws.book.location.sheet,
+                row: 1,
+                col: ci as usize,
+            })
             .expect("failed to get style");
         assert_eq!(
             "#800000",
@@ -1250,7 +1371,11 @@ fn test_color_col() {
     for ri in [1, book::LAST_ROW] {
         let style = ws
             .book
-            .get_cell_style(&Address { sheet: ws.book.location.sheet, row: ri as usize, col: 1 })
+            .get_cell_style(&Address {
+                sheet: ws.book.location.sheet,
+                row: ri as usize,
+                col: 1,
+            })
             .expect("failed to get style");
         assert_eq!(
             "#800000",
@@ -1268,7 +1393,11 @@ fn test_bold_text() {
     let mut ws = new_workspace();
     let before_style = ws
         .book
-        .get_cell_style(&Address { sheet: 0, row: 1, col: 1 })
+        .get_cell_style(&Address {
+            sheet: 0,
+            row: 1,
+            col: 1,
+        })
         .expect("Failed to get style");
     assert!(!before_style.font.b);
     script()
@@ -1277,7 +1406,11 @@ fn test_bold_text() {
         .expect("Unable to run script");
     let style = ws
         .book
-        .get_cell_style(&Address { sheet: 0, row: 1, col: 1 })
+        .get_cell_style(&Address {
+            sheet: 0,
+            row: 1,
+            col: 1,
+        })
         .expect("Failed to get style");
     assert!(style.font.b);
     script()
@@ -1292,7 +1425,11 @@ fn test_italic_text() {
     let mut ws = new_workspace();
     let before_style = ws
         .book
-        .get_cell_style(&Address { sheet: 0, row: 1, col: 1 })
+        .get_cell_style(&Address {
+            sheet: 0,
+            row: 1,
+            col: 1,
+        })
         .expect("Failed to get style");
     assert!(!before_style.font.i);
     script()
@@ -1301,7 +1438,11 @@ fn test_italic_text() {
         .expect("Unable to run script");
     let style = ws
         .book
-        .get_cell_style(&Address { sheet: 0, row: 1, col: 1 })
+        .get_cell_style(&Address {
+            sheet: 0,
+            row: 1,
+            col: 1,
+        })
         .expect("Failed to get style");
     assert!(style.font.i);
     script()
@@ -1331,7 +1472,7 @@ fn test_quit_dialog() {
         .run(&mut ws)
         .expect("Failed to run input script");
     assert!(result.is_some());
-    
+
     script()
         .chars("efoo")
         .enter()
@@ -1344,7 +1485,7 @@ fn test_quit_dialog() {
         .expect("Failed to run input script");
     assert!(!result.is_some());
     assert_eq!(ws.state.modality(), &Modality::Quit);
-    
+
     script()
         .char('n')
         .run(&mut ws)