Change table to box-style, supports unicode by default and ASCII as fallback mode

src/kalshi_csv/cli.py

@@ -9,6 +9,10 @@ from .formatter import (
     format_currency_color,
     format_currency_color_padded,
     truncate_ticker,
+    format_table_header,
+    format_table_separator,
+    format_table_row,
+    get_box_chars,
 )
 
 
@@ -26,29 +30,45 @@ def main():
         action="store_true",
         help="Disable ANSI color output",
     )
+    parser.add_argument(
+        "--ascii",
+        action="store_true",
+        help="Use ASCII characters instead of Unicode box-drawing",
+    )
 
     args = parser.parse_args()
     no_color = args.no_color
+    ascii_mode = args.ascii
 
     kalshi = KalshiCSV(args.csv_path)
     kalshi.parse()
 
+    headers = ["Ticker", "Side", "Qty", "Entry", "Exit", "P&L (No Fees)", "Fees"]
+    widths = [32, 4, 6, 6, 6, 14, 6]
+
     print()
-    print(
-        f"{'Ticker':<32} | {'Side':<4} | {'Qty':<6} | {'Entry':<6} | {'Exit':<6} | {'P&L (No Fees)':<14} | {'Fees':<6}"
-    )
-    print("-" * 90)
+    print(format_table_separator(widths, ascii_mode, "top"))
+    print(format_table_header(headers, widths, ascii_mode))
+    print(format_table_separator(widths, ascii_mode, "middle"))
 
     for trade in kalshi.trades:
         pnl_str = format_currency_color_padded(trade["pnl_no_fees"], 14, no_color)
         fees = trade["open_fees"] + trade["close_fees"]
         ticker_display = truncate_ticker(trade["ticker"])
-        print(
-            f"{ticker_display:<32} | {trade['side']:<4} | {trade['qty']:<6.2f} | "
-            f"${trade['entry']:<5.2f} | ${trade['exit']:<5.2f} | {pnl_str} | ${fees:<5.2f}"
-        )
         
-    print("-" * 90)
+        box = get_box_chars(ascii_mode)
+        row = (
+            f" {ticker_display:<32} "
+            f"{box['vertical']} {trade['side']:<4} "
+            f"{box['vertical']} {trade['qty']:<6.2f} "
+            f"{box['vertical']} ${trade['entry']:<5.2f} "
+            f"{box['vertical']} ${trade['exit']:<5.2f} "
+            f"{box['vertical']} {pnl_str} "
+            f"{box['vertical']} ${fees:<5.2f} "
+        )
+        print(box["vertical"] + row + box["vertical"])
+
+    print(format_table_separator(widths, ascii_mode, "bottom"))
     print(f"Total Transactions Parsed: {kalshi.summary['trade_count']}")
     print(f"Total Exchange Fees Paid:  ${kalshi.summary['total_fees']:.2f}")
     print(

src/kalshi_csv/formatter.py

@@ -51,3 +51,64 @@ def truncate_ticker(ticker, max_len=32):
     if len(ticker) > 29:
         return ticker[:29] + "..."
     return ticker
+
+
+UNICODE_BOX = {
+    "top_left": "┌",
+    "top_right": "┐",
+    "bottom_left": "└",
+    "bottom_right": "┘",
+    "horizontal": "─",
+    "vertical": "│",
+    "top_tee": "┬",
+    "bottom_tee": "┴",
+    "left_tee": "├",
+    "right_tee": "┤",
+    "cross": "┼",
+}
+
+ASCII_BOX = {
+    "top_left": "+",
+    "top_right": "+",
+    "bottom_left": "+",
+    "bottom_right": "+",
+    "horizontal": "-",
+    "vertical": "|",
+    "top_tee": "+",
+    "bottom_tee": "+",
+    "left_tee": "+",
+    "right_tee": "+",
+    "cross": "+",
+}
+
+
+def get_box_chars(ascii_mode=False):
+    """Returns the appropriate box-drawing characters."""
+    return ASCII_BOX if ascii_mode else UNICODE_BOX
+
+
+def format_table_header(headers, widths, ascii_mode=False):
+    """Formats a table header row with box-drawing characters."""
+    box = get_box_chars(ascii_mode)
+    cells = [f" {h:<{w}} " for h, w in zip(headers, widths)]
+    return box["vertical"] + box["vertical"].join(cells) + box["vertical"]
+
+
+def format_table_separator(widths, ascii_mode=False, position="middle"):
+    """Formats a table separator line with box-drawing characters."""
+    box = get_box_chars(ascii_mode)
+    segments = [box["horizontal"] * (w + 2) for w in widths]
+    
+    if position == "top":
+        return box["top_left"] + box["top_tee"].join(segments) + box["top_right"]
+    elif position == "bottom":
+        return box["bottom_left"] + box["bottom_tee"].join(segments) + box["bottom_right"]
+    else:
+        return box["left_tee"] + box["cross"].join(segments) + box["right_tee"]
+
+
+def format_table_row(values, widths, ascii_mode=False):
+    """Formats a table data row with box-drawing characters."""
+    box = get_box_chars(ascii_mode)
+    cells = [f" {str(v):<{w}} " for v, w in zip(values, widths)]
+    return box["vertical"] + box["vertical"].join(cells) + box["vertical"]

tests/test_cli.py

@@ -85,3 +85,17 @@ def test_cli_ticker_truncation(tmp_path):
     assert result.returncode == 0
     assert "VERYLONGTICKERNAME-THAT-EXCEE..." in result.stdout
     assert "VERYLONGTICKERNAME-THAT-EXCEEDS-THIRTY-CHARS" not in result.stdout
+
+
+def test_cli_ascii_flag(sample_csv):
+    result = subprocess.run(
+        [sys.executable, "-m", "kalshi_csv.cli", sample_csv, "--no-color", "--ascii"],
+        capture_output=True,
+        text=True,
+    )
+    assert result.returncode == 0
+    assert "+" in result.stdout
+    assert "-" in result.stdout
+    assert "|" in result.stdout
+    assert "┌" not in result.stdout
+    assert "│" not in result.stdout