View CSV from terminal

viewcsv.sh

# ---- CSV Visualizer ----
viewcsv() {
    if [ -z "$1" ]; then
        echo "Uso: viewcsv <arquivo.csv> [num_linhas]" >&2
        return 1
    fi

    python3 -c '
import sys, csv, unicodedata

def char_width(s):
    """Calcula a largura real de exibição no terminal."""
    return sum(2 if unicodedata.east_asian_width(c) in ("F", "W") else 1 for c in s)

def pad_str(s, width):
    """Aplica ljust baseando-se na largura visual dos caracteres."""
    w = char_width(s)
    return s + " " * max(0, width - w)

filepath = sys.argv[1]
limit = int(sys.argv[2]) if len(sys.argv) > 2 else 10

try:
    with open(filepath, mode="r", newline="", encoding="utf-8-sig") as f:
        reader = csv.reader(f)
        try:
            header = next(reader)
        except StopIteration:
            print("Erro: O arquivo está vazio.", file=sys.stderr)
            sys.exit(1)

        rows = []
        for _ in range(limit):
            try:
                rows.append(next(reader))
            except StopIteration:
                break

    if not rows:
        print("Arquivo contém apenas o cabeçalho.")
        sys.exit(0)

    # Garante que todas as linhas tenham a mesma quantidade de colunas do cabeçalho
    num_cols = len(header)
    normalized_rows = [r + [""] * (num_cols - len(r)) for r in rows]

    # Transposição: cada item é (Nome da Coluna, [Valores das linhas...])
    transposed = [(h, [r[i] for r in normalized_rows]) for i, h in enumerate(header)]

    # Largura da coluna de nomes (coluna 0)
    col0_w = max(char_width(h) for h, _ in transposed)

    # Largura individual para cada sub-coluna de dados (L1, L2, ...)
    num_samples = len(normalized_rows)
    val_widths = [
        max(char_width(t[1][row_idx]) for t in transposed)
        for row_idx in range(num_samples)
    ]

    # Formatação e desenho da tabela
    sep_top = "═" * (col0_w + 2) + "╦" + "╦".join("═" * (w + 2) for w in val_widths)
    sep_bot = "═" * (col0_w + 2) + "╩" + "╩".join("═" * (w + 2) for w in val_widths)

    print(f"╔{sep_top}╗")

    for col_name, vals in transposed:
        col0_formatted = pad_str(col_name, col0_w)
        vals_formatted = " ║ ".join(pad_str(vals[i], val_widths[i]) for i in range(len(vals)))
        print(f"║ {col0_formatted} ║ {vals_formatted} ║")

    print(f"╚{sep_bot}╝")

except FileNotFoundError:
    print(f"Erro: Arquivo \"{filepath}\" não encontrado.", file=sys.stderr)
    sys.exit(1)
' "$1" "${2:-10}"
}