From 3020077da8efbf914a9cb0a2cbb50362d339a39a Mon Sep 17 00:00:00 2001
From: Blaž Hrastnik
Date: Tue, 29 Sep 2020 01:00:35 +0900
Subject: Extend selection commands.

---
 helix-view/src/commands.rs | 40 ++++++++++++++++++++++++++++++++++++++++
 helix-view/src/keymap.rs   | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)

(limited to 'helix-view/src')

diff --git a/helix-view/src/commands.rs b/helix-view/src/commands.rs
index 42390c23..d868a17c 100644
--- a/helix-view/src/commands.rs
+++ b/helix-view/src/commands.rs
@@ -115,6 +115,46 @@ pub fn move_next_word_end(view: &mut View, count: usize) {
 
 // avoid select by default by having a visual mode switch that makes movements into selects
 
+pub fn extend_char_left(view: &mut View, count: usize) {
+    // TODO: use a transaction
+    let selection = view
+        .state
+        .extend_selection(Direction::Backward, Granularity::Character, count);
+    view.state.selection = selection;
+}
+
+pub fn extend_char_right(view: &mut View, count: usize) {
+    // TODO: use a transaction
+    view.state.selection =
+        view.state
+            .extend_selection(Direction::Forward, Granularity::Character, count);
+}
+
+pub fn extend_line_up(view: &mut View, count: usize) {
+    // TODO: use a transaction
+    view.state.selection =
+        view.state
+            .extend_selection(Direction::Backward, Granularity::Line, count);
+}
+
+pub fn extend_line_down(view: &mut View, count: usize) {
+    // TODO: use a transaction
+    view.state.selection =
+        view.state
+            .extend_selection(Direction::Forward, Granularity::Line, count);
+}
+
+pub fn delete_selection(view: &mut View, _count: usize) {
+    let transaction =
+        Transaction::change_by_selection(&view.state, |range| (range.from(), range.to(), None));
+    transaction.apply(&mut view.state);
+}
+
+pub fn change_selection(view: &mut View, count: usize) {
+    delete_selection(view, count);
+    insert_mode(view, count);
+}
+
 // insert mode:
 // first we calculate the correct cursors/selections
 // then we just append at each cursor
diff --git a/helix-view/src/keymap.rs b/helix-view/src/keymap.rs
index 5d9b6653..750f1a5f 100644
--- a/helix-view/src/keymap.rs
+++ b/helix-view/src/keymap.rs
@@ -7,7 +7,9 @@ use std::collections::HashMap;
 //      normal = {
 //          q = record_macro
 //          w = (next) word
+//          W = next WORD
 //          e = end of word
+//          E = end of WORD
 //          r =
 //          t = 'till char
 //          y = yank
@@ -55,6 +57,12 @@ use std::collections::HashMap;
 //          & = align cursor
 //          ? = extend to next given regex match (alt = to prev)
 //
+//          in kakoune these are alt-h alt-l / gh gl
+//                              select from curs to begin end / move curs to begin end
+//          0 = start of line
+//          ^ = start of line (first non blank char)
+//          $ = end of line
+//
 //          z = save selections
 //          Z = restore selections
 //          x = select line
@@ -110,6 +118,22 @@ pub fn default() -> Keymaps {
                     code: KeyCode::Char('l'),
                     modifiers: Modifiers::NONE
                 }] => commands::move_char_right as Command,
+                vec![Key {
+                    code: KeyCode::Char('H'),
+                    modifiers: Modifiers::SHIFT
+                }] => commands::extend_char_left as Command,
+                vec![Key {
+                    code: KeyCode::Char('J'),
+                    modifiers: Modifiers::SHIFT
+                }] => commands::extend_line_down as Command,
+                vec![Key {
+                    code: KeyCode::Char('K'),
+                    modifiers: Modifiers::SHIFT
+                }] => commands::extend_line_up as Command,
+                vec![Key {
+                    code: KeyCode::Char('L'),
+                    modifiers: Modifiers::SHIFT
+                }] => commands::extend_char_right as Command,
                 vec![Key {
                     code: KeyCode::Char('w'),
                     modifiers: Modifiers::NONE
@@ -142,6 +166,14 @@ pub fn default() -> Keymaps {
                     code: KeyCode::Char('o'),
                     modifiers: Modifiers::NONE
                 }] => commands::open_below as Command,
+                vec![Key {
+                    code: KeyCode::Char('d'),
+                    modifiers: Modifiers::NONE
+                }] => commands::delete_selection as Command,
+                vec![Key {
+                    code: KeyCode::Char('c'),
+                    modifiers: Modifiers::NONE
+                }] => commands::change_selection as Command,
                 vec![Key {
                     code: KeyCode::Esc,
                     modifiers: Modifiers::NONE
-- 
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