From 63a64bee02060f85690543e9ff77cb41f663b7c7 Mon Sep 17 00:00:00 2001
From: Bob Qi <baobin.qi@gmail.com>
Date: Tue, 9 Nov 2021 11:17:32 +0800
Subject: [PATCH] add <C-h>, <C-u>, <C-d>, Delete in prompt mode

---
 book/src/keymap.md          |  4 +++-
 helix-term/src/ui/prompt.rs | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/book/src/keymap.md b/book/src/keymap.md
index c6feb44f84ab..6ae1e8d476fc 100644
--- a/book/src/keymap.md
+++ b/book/src/keymap.md
@@ -274,8 +274,10 @@ Keys to use within prompt, Remapping currently not supported.
 | `Ctrl-e`, `End`         | move prompt end                                                         |
 | `Ctrl-a`, `Home`        | move prompt start                                                       |
 | `Ctrl-w`                | delete previous word                                                    |
+| `Ctrl-u`                | delete to start of line                                                 |
 | `Ctrl-k`                | delete to end of line                                                   |
-| `backspace`             | delete previous char                                                    |
+| `backspace`, `Ctrl-h`   | delete previous char                                                    |
+| `delete`, `Ctrl-d`      | delete previous char                                                    |
 | `Ctrl-s`                | insert a word under doc cursor, may be changed to Ctrl-r Ctrl-w later   |
 | `Ctrl-p`, `Up`          | select previous history                                                 |
 | `Ctrl-n`, `Down`        | select next history                                                     |
diff --git a/helix-term/src/ui/prompt.rs b/helix-term/src/ui/prompt.rs
index 29ca18b11eb8..22e4adb8ac5a 100644
--- a/helix-term/src/ui/prompt.rs
+++ b/helix-term/src/ui/prompt.rs
@@ -212,6 +212,14 @@ impl Prompt {
         self.completion = (self.completion_fn)(&self.line);
     }
 
+    pub fn delete_char_forwards(&mut self) {
+        let pos = self.eval_movement(Movement::ForwardChar(1));
+        self.line.replace_range(self.cursor..pos, "");
+
+        self.exit_selection();
+        self.completion = (self.completion_fn)(&self.line);
+    }
+
     pub fn delete_word_backwards(&mut self) {
         let pos = self.eval_movement(Movement::BackwardWord(1));
         self.line.replace_range(pos..self.cursor, "");
@@ -221,6 +229,15 @@ impl Prompt {
         self.completion = (self.completion_fn)(&self.line);
     }
 
+    pub fn kill_to_start_of_line(&mut self) {
+        let pos = self.eval_movement(Movement::StartOfLine);
+        self.line.replace_range(pos..self.cursor, "");
+        self.cursor = pos;
+
+        self.exit_selection();
+        self.completion = (self.completion_fn)(&self.line);
+    }
+
     pub fn kill_to_end_of_line(&mut self) {
         let pos = self.eval_movement(Movement::EndOfLine);
         self.line.replace_range(self.cursor..pos, "");
@@ -472,12 +489,31 @@ impl Component for Prompt {
                 modifiers: KeyModifiers::CONTROL,
             } => self.kill_to_end_of_line(),
             KeyEvent {
+                code: KeyCode::Char('u'),
+                modifiers: KeyModifiers::CONTROL,
+            } => self.kill_to_start_of_line(),
+            KeyEvent {
+                code: KeyCode::Char('h'),
+                modifiers: KeyModifiers::CONTROL,
+            }
+            | KeyEvent {
                 code: KeyCode::Backspace,
                 modifiers: KeyModifiers::NONE,
             } => {
                 self.delete_char_backwards();
                 (self.callback_fn)(cx, &self.line, PromptEvent::Update);
             }
+            KeyEvent {
+                code: KeyCode::Char('d'),
+                modifiers: KeyModifiers::CONTROL,
+            }
+            | KeyEvent {
+                code: KeyCode::Delete,
+                modifiers: KeyModifiers::NONE,
+            } => {
+                self.delete_char_forwards();
+                (self.callback_fn)(cx, &self.line, PromptEvent::Update);
+            }
             KeyEvent {
                 code: KeyCode::Char('s'),
                 modifiers: KeyModifiers::CONTROL,