move cursor between paragraphs forward/back

.github/workflows/ci.yml

@@ -18,6 +18,6 @@ jobs:
       - name: rustfmt
         run: cargo fmt -- --check
       - name: clippy
-        run: cargo clippy -- -D warnings
+        run: cargo clippy --examples --all-features -- -D warnings
       - name: clippy with --no-default-features
         run: cargo clippy --no-default-features -- -D warnings

src/cursor.rs

@@ -12,6 +12,8 @@ pub enum CursorMove {
     Bottom,
     WordForward,
     WordBack,
+    ParagraphForward,
+    ParagraphBack,
 }
 
 #[derive(PartialEq, Eq, Clone, Copy)]
@@ -124,6 +126,31 @@ impl CursorMove {
                     Some((row, 0))
                 }
             }
+            ParagraphForward => {
+                let mut prev_is_empty = lines[row].is_empty();
+                for row in row + 1..lines.len() {
+                    let line = &lines[row];
+                    let is_empty = line.is_empty();
+                    if !is_empty && prev_is_empty {
+                        return Some((row, fit_col(col, line)));
+                    }
+                    prev_is_empty = is_empty;
+                }
+                let row = lines.len() - 1;
+                Some((row, fit_col(col, &lines[row])))
+            }
+            ParagraphBack if row == 0 => None,
+            ParagraphBack => {
+                let mut prev_is_empty = lines[row - 1].is_empty();
+                for row in (0..row - 1).rev() {
+                    let is_empty = lines[row].is_empty();
+                    if is_empty && !prev_is_empty {
+                        return Some((row + 1, fit_col(col, &lines[row + 1])));
+                    }
+                    prev_is_empty = is_empty;
+                }
+                Some((0, fit_col(col, &lines[0])))
+            }
         }
     }
 }

src/input.rs

@@ -14,6 +14,8 @@ pub enum Key {
     Delete,
     Home,
     End,
+    PageUp,
+    PageDown,
     Null,
 }
 
@@ -62,6 +64,8 @@ impl From<KeyEvent> for Input {
             KeyCode::Delete => Key::Delete,
             KeyCode::Home => Key::Home,
             KeyCode::End => Key::End,
+            KeyCode::PageUp => Key::PageUp,
+            KeyCode::PageDown => Key::PageDown,
             _ => Key::Null,
         };
         Self { key, ctrl, alt }

src/lib.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::needless_range_loop)]
+
 mod cursor;
 mod history;
 mod input;

src/textarea.rs

@@ -37,12 +37,12 @@ impl<'a> Default for TextArea<'a> {
 }
 
 impl<'a> TextArea<'a> {
-    pub fn new(mut v: Vec<String>) -> Self {
-        if v.is_empty() {
-            v.push(String::new());
+    pub fn new(mut lines: Vec<String>) -> Self {
+        if lines.is_empty() {
+            lines.push(String::new());
         }
         Self {
-            lines: v,
+            lines,
             block: None,
             style: Style::default(),
             cursor: (0, 0),
@@ -204,6 +204,22 @@ impl<'a> TextArea<'a> {
                 ctrl: true,
                 alt: false,
             } => self.move_cursor(CursorMove::WordBack),
+            Input {
+                key: Key::Char('n'),
+                ctrl: false,
+                alt: true,
+            }
+            | Input {
+                key: Key::PageDown, ..
+            } => self.move_cursor(CursorMove::ParagraphForward),
+            Input {
+                key: Key::Char('p'),
+                ctrl: false,
+                alt: true,
+            }
+            | Input {
+                key: Key::PageUp, ..
+            } => self.move_cursor(CursorMove::ParagraphBack),
             Input {
                 key: Key::Char('u'),
                 ctrl: true,