starting new structure

src/useCursor/useVimMotions.ts

@@ -0,0 +1,118 @@
+import { useRef } from 'react';
+import type { VimMotionSystem, Motion } from './types';
+
+export function useVimMotions(): VimMotionSystem {
+  const countRef = useRef<string>('');
+  const lastMotionRef = useRef<Motion | null>(null);
+
+  const processKey = (key: string) => {
+    if (key >= '0' && key <= '9') {
+      if (key === '0' && countRef.current === '') {
+        return { type: 'anchor', data: 'start' };
+      }
+      countRef.current += key;
+      return { type: 'count', data: key };
+    }
+
+    const count = countRef.current ? parseInt(countRef.current, 10) : 1;
+
+    switch (key) {
+      case 'h':
+        const motionH = { dr: 0, dc: -1, steps: count };
+        lastMotionRef.current = motionH;
+        countRef.current = '';
+        return { type: 'move', data: motionH };
+
+      case 'j':
+        const motionJ = { dr: 1, dc: 0, steps: count };
+        lastMotionRef.current = motionJ;
+        countRef.current = '';
+        return { type: 'move', data: motionJ };
+
+      case 'k':
+        const motionK = { dr: -1, dc: 0, steps: count };
+        lastMotionRef.current = motionK;
+        countRef.current = '';
+        return { type: 'move', data: motionK };
+
+      case 'l':
+        const motionL = { dr: 0, dc: 1, steps: count };
+        lastMotionRef.current = motionL;
+        countRef.current = '';
+        return { type: 'move', data: motionL };
+
+      case '^':
+        countRef.current = '';
+        return { type: 'anchor', data: 'start' };
+
+      case '$':
+        countRef.current = '';
+        return { type: 'anchor', data: 'end' };
+
+      case 'g':
+        countRef.current = '';
+        return { type: 'anchor', data: 'top' };
+
+      case 'G':
+        countRef.current = '';
+        return { type: 'anchor', data: 'bottom' };
+
+      case '.':
+        const lastMotion = lastMotionRef.current;
+        if (lastMotion) {
+          return { type: 'repeat', data: lastMotion };
+        }
+        return null;
+
+      case 'i':
+        countRef.current = '';
+        return { type: 'mode', data: 'edit' };
+
+      case 'Escape':
+        countRef.current = '';
+        return { type: 'mode', data: 'normal' };
+
+      case 'x':
+      case 'Delete':
+      case 'Backspace':
+        countRef.current = '';
+        return { type: 'erase', data: null };
+
+      default:
+        if (key >= '1' && key <= '9') {
+          countRef.current = '';
+          return { type: 'digit', data: key };
+        }
+        return null;
+    }
+  };
+
+  const resetCount = () => {
+    countRef.current = '';
+  };
+
+  const getCount = () => {
+    return countRef.current ? parseInt(countRef.current, 10) : 1;
+  };
+
+  const hasCount = () => {
+    return countRef.current !== '';
+  };
+
+  const setLastMotion = (motion: Motion) => {
+    lastMotionRef.current = motion;
+  };
+
+  const repeatLastMotion = () => {
+    return lastMotionRef.current;
+  };
+
+  return {
+    processKey,
+    resetCount,
+    getCount,
+    hasCount,
+    setLastMotion,
+    repeatLastMotion
+  };
+}