| #!/usr/bin/env bash |
| |
| set -euo pipefail |
| cd "$TB_WORK" |
| mkdir -p bin |
|
|
| cat > bin/canon <<'PYEOF' |
| |
| import csv |
| import re |
| import sys |
| from decimal import Decimal, InvalidOperation |
| from pathlib import Path |
|
|
| NUMERIC = re.compile(r"^[+-]?(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?$") |
|
|
|
|
| def normalize(cell): |
| if not NUMERIC.match(cell): |
| return cell |
| try: |
| value = Decimal(cell) |
| except InvalidOperation: |
| return cell |
| if value == 0: |
| return "0" |
| return format(value.normalize(), "f") |
|
|
|
|
| def main(argv): |
| if len(argv) != 3: |
| sys.stderr.write("usage: canon <input.csv> <output.tsv>\n") |
| return 1 |
| source = Path(argv[1]) |
| target = Path(argv[2]) |
| if not source.is_file(): |
| sys.stderr.write("no such file: %s\n" % argv[1]) |
| return 2 |
|
|
| with open(source, "r", encoding="utf-8-sig", newline="") as handle: |
| reader = csv.reader(handle) |
| header = next(reader, None) |
| if header is None: |
| header = [] |
| header = [name.strip() for name in header] |
|
|
| seen = set() |
| for name in header: |
| key = name.casefold() |
| if key in seen: |
| sys.stderr.write("duplicate column: %s\n" % name) |
| return 3 |
| seen.add(key) |
|
|
| rows = [] |
| previous_line = reader.line_num |
| for record in reader: |
| start = previous_line + 1 |
| previous_line = reader.line_num |
| if not record: |
| continue |
| if len(record) != len(header): |
| sys.stderr.write("malformed row: line %d\n" % start) |
| return 4 |
| rows.append([normalize(cell) for cell in record]) |
|
|
| rows.sort(key=lambda row: (row[0], row[1] if len(row) > 1 else "")) |
|
|
| target.parent.mkdir(parents=True, exist_ok=True) |
| with open(target, "w", encoding="utf-8", newline="") as handle: |
| handle.write("\t".join(header) + "\n") |
| for row in rows: |
| handle.write("\t".join(row) + "\n") |
| return 0 |
|
|
|
|
| if __name__ == "__main__": |
| sys.exit(main(sys.argv)) |
| PYEOF |
|
|
| chmod +x bin/canon |
| ./bin/canon data/orders.csv out/orders.tsv |
|
|
