Add ctrl-w in insert mode

It seemed to panic when I pressed too many times, but that is from
lsp side.

1 files changed, 33 insertions, 0 deletions

diff --git a/helix-core/src/words.rs b/helix-core/src/words.rs
new file mode 100644
index 00000000..0099d56a
--- /dev/null
+++ b/helix-core/src/words.rs
@@ -0,0 +1,33 @@
+use crate::movement::{categorize, is_horiz_blank, is_word, skip_over_prev};
+use ropey::RopeSlice;
+
+#[must_use]
+pub fn nth_prev_word_boundary(slice: RopeSlice, mut char_idx: usize, count: usize) -> usize {
+    let mut with_end = false;
+
+    for _ in 0..count {
+        if char_idx == 0 {
+            break;
+        }
+
+        // return if not skip while?
+        skip_over_prev(slice, &mut char_idx, |ch| ch == '\n');
+
+        with_end = skip_over_prev(slice, &mut char_idx, is_horiz_blank);
+
+        // refetch
+        let ch = slice.char(char_idx);
+
+        if is_word(ch) {
+            with_end = skip_over_prev(slice, &mut char_idx, is_word);
+        } else if ch.is_ascii_punctuation() {
+            with_end = skip_over_prev(slice, &mut char_idx, |ch| ch.is_ascii_punctuation());
+        }
+    }
+
+    if with_end {
+        char_idx
+    } else {
+        char_idx + 1
+    }
+}