Add a command module.

1 files changed, 45 insertions, 0 deletions

diff --git a/helix-core/src/commands.rs b/helix-core/src/commands.rs
new file mode 100644
index 00000000..78a1481a
--- /dev/null
+++ b/helix-core/src/commands.rs
@@ -0,0 +1,45 @@
+use crate::state::{Direction, Granularity, State};
+
+/// A command is a function that takes the current state and a count, and does a side-effect on the
+/// state (usually by creating and applying a transaction).
+type Command = fn(state: &mut State, count: usize);
+
+fn move_char_left(state: &mut State, count: usize) {
+    // TODO: use a transaction
+    state.selection = state.move_selection(
+        state.selection,
+        Direction::Backward,
+        Granularity::Character,
+        count,
+    );
+}
+
+fn move_char_right(state: &mut State, count: usize) {
+    // TODO: use a transaction
+    state.selection = state.move_selection(
+        state.selection,
+        Direction::Forward,
+        Granularity::Character,
+        count,
+    );
+}
+
+fn move_line_up(state: &mut State, count: usize) {
+    // TODO: use a transaction
+    state.selection = state.move_selection(
+        state.selection,
+        Direction::Backward,
+        Granularity::Line,
+        count,
+    );
+}
+
+fn move_line_down(state: &mut State, count: usize) {
+    // TODO: use a transaction
+    state.selection = state.move_selection(
+        state.selection,
+        Direction::Forward,
+        Granularity::Line,
+        count,
+    );
+}