Add more convert to case commands (#2825)

I'm using [convert_case](https://crates.io/crates/convert_case)
underneath the hood, which has over 35 million downloads and feels
solid.

Release Notes:

- Added commands to convert between variable name styles
([#1821](https://github.com/zed-industries/community/issues/1821)).
    - `convert to kebab case`
    - `convert to snake case`
    - `convert to upper camel case`
    - `convert to lower camel case`
    - `convert to title case`

Cargo.lock

@@ -1649,6 +1649,15 @@ dependencies = [
  "theme",
 ]
 
+[[package]]
+name = "convert_case"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec182b0ca2f35d8fc196cf3404988fd8b8c739a4d270ff118a398feb0cbec1ca"
+dependencies = [
+ "unicode-segmentation",
+]
+
 [[package]]
 name = "copilot"
 version = "0.1.0"
@@ -2314,6 +2323,7 @@ dependencies = [
  "clock",
  "collections",
  "context_menu",
+ "convert_case",
  "copilot",
  "ctor",
  "db",

crates/editor/Cargo.toml

@@ -47,6 +47,7 @@ workspace = { path = "../workspace" }
 
 aho-corasick = "0.7"
 anyhow.workspace = true
+convert_case = "0.6.0"
 futures.workspace = true
 indoc = "1.0.4"
 itertools = "0.10"
@@ -56,12 +57,12 @@ ordered-float.workspace = true
 parking_lot.workspace = true
 postage.workspace = true
 pulldown-cmark = { version = "0.9.2", default-features = false }
+rand.workspace = true
 schemars.workspace = true
 serde.workspace = true
 serde_derive.workspace = true
 smallvec.workspace = true
 smol.workspace = true
-rand.workspace = true
 
 tree-sitter-rust = { workspace = true, optional = true }
 tree-sitter-html = { workspace = true, optional = true }

crates/editor/src/editor.rs

@@ -28,6 +28,7 @@ use blink_manager::BlinkManager;
 use client::{ClickhouseEvent, TelemetrySettings};
 use clock::{Global, ReplicaId};
 use collections::{BTreeMap, Bound, HashMap, HashSet, VecDeque};
+use convert_case::{Case, Casing};
 use copilot::Copilot;
 pub use display_map::DisplayPoint;
 use display_map::*;
@@ -233,6 +234,11 @@ actions!(
         ShuffleLines,
         ConvertToUpperCase,
         ConvertToLowerCase,
+        ConvertToTitleCase,
+        ConvertToSnakeCase,
+        ConvertToKebabCase,
+        ConvertToUpperCamelCase,
+        ConvertToLowerCamelCase,
         Transpose,
         Cut,
         Copy,
@@ -357,6 +363,11 @@ pub fn init(cx: &mut AppContext) {
     cx.add_action(Editor::shuffle_lines);
     cx.add_action(Editor::convert_to_upper_case);
     cx.add_action(Editor::convert_to_lower_case);
+    cx.add_action(Editor::convert_to_title_case);
+    cx.add_action(Editor::convert_to_snake_case);
+    cx.add_action(Editor::convert_to_kebab_case);
+    cx.add_action(Editor::convert_to_upper_camel_case);
+    cx.add_action(Editor::convert_to_lower_camel_case);
     cx.add_action(Editor::delete_to_previous_word_start);
     cx.add_action(Editor::delete_to_previous_subword_start);
     cx.add_action(Editor::delete_to_next_word_end);
@@ -4318,6 +4329,34 @@ impl Editor {
         self.manipulate_text(cx, |text| text.to_lowercase())
     }
 
+    pub fn convert_to_title_case(&mut self, _: &ConvertToTitleCase, cx: &mut ViewContext<Self>) {
+        self.manipulate_text(cx, |text| text.to_case(Case::Title))
+    }
+
+    pub fn convert_to_snake_case(&mut self, _: &ConvertToSnakeCase, cx: &mut ViewContext<Self>) {
+        self.manipulate_text(cx, |text| text.to_case(Case::Snake))
+    }
+
+    pub fn convert_to_kebab_case(&mut self, _: &ConvertToKebabCase, cx: &mut ViewContext<Self>) {
+        self.manipulate_text(cx, |text| text.to_case(Case::Kebab))
+    }
+
+    pub fn convert_to_upper_camel_case(
+        &mut self,
+        _: &ConvertToUpperCamelCase,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.manipulate_text(cx, |text| text.to_case(Case::UpperCamel))
+    }
+
+    pub fn convert_to_lower_camel_case(
+        &mut self,
+        _: &ConvertToLowerCamelCase,
+        cx: &mut ViewContext<Self>,
+    ) {
+        self.manipulate_text(cx, |text| text.to_case(Case::Camel))
+    }
+
     fn manipulate_text<Fn>(&mut self, cx: &mut ViewContext<Self>, mut callback: Fn)
     where
         Fn: FnMut(&str) -> String,