feat(vi): add u, U visual mode commands

src/core_editor/editor.rs

@@ -140,6 +140,9 @@ impl Editor {
             EditCommand::SelectAll => self.select_all(),
             EditCommand::CutSelection => self.cut_selection_to_cut_buffer(),
             EditCommand::CopySelection => self.copy_selection_to_cut_buffer(),
+            EditCommand::LowercaseSelection => self.lowercase_selection(),
+            EditCommand::UppercaseSelection => self.uppercase_selection(),
+            EditCommand::SwitchcaseSelection => self.switchcase_selection(),
             EditCommand::Paste => self.paste_cut_buffer(),
             EditCommand::CopyFromStart => self.copy_from_start(),
             EditCommand::CopyFromStartLinewise => self.copy_from_start_linewise(),
@@ -674,6 +677,37 @@ impl Editor {
         }
     }
 
+    fn lowercase_selection(&mut self) {
+        if let Some((start, end)) = self.get_selection() {
+            let lowercase_slice = self.line_buffer.get_buffer()[start..end].to_ascii_lowercase();
+            self.line_buffer.replace_range(start..end, &lowercase_slice);
+        }
+    }
+
+    fn uppercase_selection(&mut self) {
+        if let Some((start, end)) = self.get_selection() {
+            let uppercase_slice = self.line_buffer.get_buffer()[start..end].to_ascii_uppercase();
+            self.line_buffer.replace_range(start..end, &uppercase_slice);
+        }
+    }
+
+    fn switchcase_selection(&mut self) {
+        if let Some((start, end)) = self.get_selection() {
+            let switchcase_slice = self.line_buffer.get_buffer()[start..end]
+                .chars()
+                .map(|ch| {
+                    if ch.is_ascii_lowercase() {
+                        ch.to_ascii_uppercase()
+                    } else {
+                        ch.to_ascii_lowercase()
+                    }
+                })
+                .collect::<String>();
+            self.line_buffer
+                .replace_range(start..end, &switchcase_slice);
+        }
+    }
+
     /// If a selection is active returns the selected range, otherwise None.
     /// The range is guaranteed to be ascending.
     pub fn get_selection(&self) -> Option<(usize, usize)> {

src/edit_mode/vi/command.rs

@@ -78,7 +78,7 @@ where
             let _ = input.next();
             Some(Command::EnterViAppend)
         }
-        Some('u') => {
+        Some('u') if mode == ViMode::Normal => {
             let _ = input.next();
             Some(Command::Undo)
         }
@@ -168,6 +168,14 @@ where
             // This arm should be unreachable
             ViMode::Insert => None,
         },
+        Some(&&u @ ('u' | 'U')) if mode == ViMode::Visual => {
+            let _ = input.next();
+            if u.is_ascii_lowercase() {
+                Some(Command::Lowercase)
+            } else {
+                Some(Command::Uppercase)
+            }
+        }
         _ => None,
     }
 }
@@ -193,6 +201,8 @@ pub enum Command {
     RewriteCurrentLine,
     Change,
     HistorySearch,
+    Lowercase,
+    Uppercase,
     Switchcase,
     RepeatLastAction,
     Yank,
@@ -260,7 +270,19 @@ impl Command {
                 }
             }
             Self::HistorySearch => vec![ReedlineOption::Event(ReedlineEvent::SearchHistory)],
-            Self::Switchcase => vec![ReedlineOption::Edit(EditCommand::SwitchcaseChar)],
+            Self::Lowercase => {
+                vec![ReedlineOption::Edit(EditCommand::LowercaseSelection)]
+            }
+            Self::Uppercase => {
+                vec![ReedlineOption::Edit(EditCommand::UppercaseSelection)]
+            }
+            Self::Switchcase => {
+                if vi_state.mode == ViMode::Visual {
+                    vec![ReedlineOption::Edit(EditCommand::SwitchcaseSelection)]
+                } else {
+                    vec![ReedlineOption::Edit(EditCommand::SwitchcaseChar)]
+                }
+            }
             // Whenever a motion is required to finish the command we must be in visual mode
             Self::Delete | Self::Change => vec![ReedlineOption::Edit(EditCommand::CutSelection)],
             Self::Yank => vec![ReedlineOption::Edit(EditCommand::CopySelection)],

src/edit_mode/vi/parser.rs

@@ -112,7 +112,12 @@ impl ParsedViSequence {
             (Some(Command::Change), ParseResult::Incomplete) if mode == ViMode::Visual => {
                 Some(ViMode::Insert)
             }
-            (Some(Command::Delete), ParseResult::Incomplete) if mode == ViMode::Visual => {
+            (Some(Command::Delete), ParseResult::Incomplete)
+            | (Some(Command::Lowercase), ParseResult::Incomplete)
+            | (Some(Command::Uppercase), ParseResult::Incomplete)
+            | (Some(Command::Switchcase), ParseResult::Incomplete)
+                if mode == ViMode::Visual =>
+            {
                 Some(ViMode::Normal)
             }
             (Some(Command::ChangeInsidePair { .. }), _) => Some(ViMode::Insert),

src/enums.rs

@@ -390,6 +390,15 @@ pub enum EditCommand {
     /// Copy selection to local buffer
     CopySelection,
 
+    /// LowercaseSelection
+    LowercaseSelection,
+
+    /// Uppercase selection
+    UppercaseSelection,
+
+    /// Switchcase selection
+    SwitchcaseSelection,
+
     /// Paste content from local buffer at the current cursor position
     Paste,
 
@@ -583,6 +592,9 @@ impl EditCommand {
             | EditCommand::CutLeftUntil(_)
             | EditCommand::CutLeftBefore(_)
             | EditCommand::CutSelection
+            | EditCommand::LowercaseSelection
+            | EditCommand::UppercaseSelection
+            | EditCommand::SwitchcaseSelection
             | EditCommand::Paste
             | EditCommand::CutInsidePair { .. }
             | EditCommand::CutAroundPair { .. }