Fix CHOP division-by-zero, overhaul README, modernize build

.github/workflows/build-test.yml

@@ -13,9 +13,11 @@ jobs:
       matrix:
         python-version: ["3.10", "3.11", "3.12", "3.13"]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install Dependencies
@@ -35,4 +37,4 @@ jobs:
         if: ${{ matrix.python-version == '3.12' }}
         run: codecov
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/publish.yml

@@ -10,9 +10,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: '3.x'
     - name: Install dependencies

CLAUDE.md

@@ -43,6 +43,16 @@ The library is a single-file module with these key components:
 - `<indicator>` - uses default column and window (e.g., `rsi`, `macd`)
 - `<indicator>_<window>` - uses default column with custom window (e.g., `rsi_6`)
 - `<column>_<window>_<indicator>` - full specification (e.g., `close_20_sma`)
+- `<column>_delta` - difference from previous row (e.g., `close_delta`)
+- `<left>_x_<right>` / `<left>_xu_<right>` / `<left>_xd_<right>` - cross/cross-up/cross-down between two columns
+- `<left>_le_<right>`, `_ge_`, `_lt_`, `_gt_`, `_eq_`, `_ne_` - comparison operators between columns
+
+**Column resolution order** (in `__init_not_exist_column`):
+1. Check the `handler` property map (multi-column indicators like macd/macds/macdh)
+2. Check for `_delta` suffix
+3. Check for cross patterns (`_x_`, `_xu_`, `_xd_`)
+4. Check for comparison patterns (`_le_`, `_ge_`, etc.)
+5. Parse as `(column, window, name)` and dispatch to `_get_<name>` handler
 
 **Configuration**:
 - `_dft_windows` dict: default window sizes for each indicator

MANIFEST.in

@@ -1,3 +1,2 @@
-include *.rst
-include *.cfg
-include *.txt
+include *.toml
+include *.txt