From e33739a2f1149a476d971d87223d76daf1b63a05 Mon Sep 17 00:00:00 2001
From: Nikita Revenco <154856872+nikitarevenco@users.noreply.github.com>
Date: Sat, 9 Nov 2024 16:32:22 +0000
Subject: [PATCH] feat: add commands for working with different cases

---
 Cargo.lock                       |  7 ++++++
 helix-term/Cargo.toml            |  1 +
 helix-term/src/commands.rs       | 40 +++++++++++++++++++++++++++++---
 helix-term/src/keymap/default.rs | 13 ++++++++---
 4 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index f8662c41e..1dd1c3de1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1197,6 +1197,12 @@ dependencies = [
  "allocator-api2",
 ]
 
+[[package]]
+name = "heck"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
+
 [[package]]
 name = "helix-core"
 version = "24.7.0"
@@ -1350,6 +1356,7 @@ dependencies = [
  "futures-util",
  "grep-regex",
  "grep-searcher",
+ "heck",
  "helix-core",
  "helix-dap",
  "helix-event",
diff --git a/helix-term/Cargo.toml b/helix-term/Cargo.toml
index dc0e20b68..dccad0720 100644
--- a/helix-term/Cargo.toml
+++ b/helix-term/Cargo.toml
@@ -35,6 +35,7 @@ helix-loader = { path = "../helix-loader" }
 anyhow = "1"
 once_cell = "1.20"
 
+heck = "0.5"
 tokio = { version = "1", features = ["rt", "rt-multi-thread", "io-util", "io-std", "time", "process", "macros", "fs", "parking_lot"] }
 tui = { path = "../helix-tui", package = "helix-tui", default-features = false, features = ["crossterm"] }
 crossterm = { version = "0.28", features = ["event-stream"] }
diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index ee2949fa0..5aef4a453 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -51,6 +51,7 @@ use helix_view::{
 };
 
 use anyhow::{anyhow, bail, ensure, Context as _};
+use heck::{ToKebabCase, ToLowerCamelCase, ToSnakeCase, ToTitleCase, ToUpperCamelCase};
 use insert::*;
 use movement::Movement;
 
@@ -329,9 +330,14 @@ impl MappableCommand {
         extend_prev_char, "Extend to previous occurrence of char",
         repeat_last_motion, "Repeat last motion",
         replace, "Replace with new char",
-        switch_case, "Switch (toggle) case",
-        switch_to_uppercase, "Switch to uppercase",
+        switch_to_alternate_case, "Switch to aLTERNATE cASE",
+        switch_to_uppercase, "Switch to UPPERCASE",
         switch_to_lowercase, "Switch to lowercase",
+        switch_to_pascal_case, "Switch to PascalCase",
+        switch_to_camel_case, "Switch to camelCase",
+        switch_to_title_case, "Switch to Title Case",
+        switch_to_snake_case, "Switch to snake_case",
+        switch_to_kebab_case, "Switch to kebab-case",
         page_up, "Move page up",
         page_down, "Move page down",
         half_page_up, "Move half page up",
@@ -1713,7 +1719,15 @@ where
     exit_select_mode(cx);
 }
 
-fn switch_case(cx: &mut Context) {
+fn switch_heck_case_impl(cx: &mut Context, change_fn: impl Fn(Tendril) -> String) {
+    switch_case_impl(cx, |string| {
+        let stri = Tendril::from_iter(string.chars());
+        let applied = change_fn(stri);
+        Tendril::from_iter(applied.chars())
+    });
+}
+
+fn switch_to_alternate_case(cx: &mut Context) {
     switch_case_impl(cx, |string| {
         string
             .chars()
@@ -1730,6 +1744,26 @@ fn switch_case(cx: &mut Context) {
     });
 }
 
+fn switch_to_pascal_case(cx: &mut Context) {
+    switch_heck_case_impl(cx, |str| str.to_upper_camel_case())
+}
+
+fn switch_to_camel_case(cx: &mut Context) {
+    switch_heck_case_impl(cx, |str| str.to_lower_camel_case())
+}
+
+fn switch_to_title_case(cx: &mut Context) {
+    switch_heck_case_impl(cx, |str| str.to_title_case())
+}
+
+fn switch_to_snake_case(cx: &mut Context) {
+    switch_heck_case_impl(cx, |str| str.to_snake_case())
+}
+
+fn switch_to_kebab_case(cx: &mut Context) {
+    switch_heck_case_impl(cx, |str| str.to_kebab_case())
+}
+
 fn switch_to_uppercase(cx: &mut Context) {
     switch_case_impl(cx, |string| {
         string.chunks().map(|chunk| chunk.to_uppercase()).collect()
diff --git a/helix-term/src/keymap/default.rs b/helix-term/src/keymap/default.rs
index 5a3e8eed4..930f3d9b1 100644
--- a/helix-term/src/keymap/default.rs
+++ b/helix-term/src/keymap/default.rs
@@ -19,9 +19,16 @@ pub fn default() -> HashMap<Mode, KeyTrie> {
         "R" => replace_with_yanked,
         "A-." =>  repeat_last_motion,
 
-        "~" => switch_case,
-        "`" => switch_to_lowercase,
-        "A-`" => switch_to_uppercase,
+        "~" => switch_to_alternate_case,
+        "`" => { "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,
+        },
 
         "home" => goto_line_start,
         "end" => goto_line_end,