feat: add case-mode section

book/src/keymap.md

@@ -11,6 +11,7 @@
     - [Goto mode](#goto-mode)
     - [Match mode](#match-mode)
     - [Window mode](#window-mode)
+    - [Case Mode](#case-mode)
     - [Space mode](#space-mode)
       - [Popup](#popup)
       - [Completion Menu](#completion-menu)
@@ -70,8 +71,6 @@ Normal mode is the default mode when you launch helix. You can return to it from
 | `r`         | Replace with a character                                             | `replace`                 |
 | `R`         | Replace with yanked text                                             | `replace_with_yanked`     |
 | `~`         | Switch case of the selected text                                     | `switch_case`             |
-| `` ` ``     | Set the selected text to lower case                                  | `switch_to_lowercase`     |
-| `` Alt-` `` | Set the selected text to upper case                                  | `switch_to_uppercase`     |
 | `i`         | Insert before selection                                              | `insert_mode`             |
 | `a`         | Insert after selection (append)                                      | `append_mode`             |
 | `I`         | Insert at the start of the line                                      | `insert_at_line_start`    |
@@ -169,6 +168,7 @@ These sub-modes are accessible from normal mode and typically switch back to nor
 | -----    | -----------                                        | -------        |
 | `v`      | Enter [select (extend) mode](#select--extend-mode) | `select_mode`  |
 | `g`      | Enter [goto mode](#goto-mode)                      | N/A            |
+| ` ` `      | Enter [case mode](#case-mode)                    | N/A            |
 | `m`      | Enter [match mode](#match-mode)                    | N/A            |
 | `:`      | Enter command mode                                 | `command_mode` |
 | `z`      | Enter [view mode](#view-mode)                      | N/A            |
@@ -232,6 +232,32 @@ Jumps to various locations.
 | `k`   | Move up textual (instead of visual) line         | `move_line_up`             |
 | `w`   | Show labels at each word and select the word that belongs to the entered labels | `goto_word` |
 
+#### Case mode
+
+Accessed by typing ` ` ` in [normal mode](#normal-mode).
+
+Various functions for changing case of text in different ways.
+
+            "a" => switch_to_alternate_case,
+            "l" => switch_to_lowercase,
+            "u" => switch_to_uppercase,
+            "p" => switch_to_pascal_case,
+            "c" => switch_to_camel_case,
+            "t" => switch_to_title_case,
+            "s" => switch_to_snake_case,
+            "k" => switch_to_kebab_case,
+| Key              | Description                                      | Command                    |
+| -----            | -----------                                      | -------                    |
+| `l`              | Switch all text to lowercase                     | `switch_to_lowercase`      |
+| `u`              | Switch all text to UPPERCASE                     | `switch_to_uppercase`      |
+| `p`              | Switch text to Pascal Case                       | `switch_to_pascal_case`    |
+| `c`              | Switch text to camelCase                         | `switch_to_camel_case`     |
+| `t`              | Switch text to Title Case                        | `switch_to_title_case`     |
+| `s`              | Switch text to snake_case                        | `switch_to_snake_case`     |
+| `k`              | Switch text to kebab-case                        | `switch_to_kebab_case`     |
+
+TODO: Mappings for selecting syntax nodes (a superset of `[`).
+
 #### Match mode
 
 Accessed by typing `m` in [normal mode](#normal-mode).