fix: suppress xlsxwriter URL warning when writing cells DEV-2020

[noliveleger]

Summary

xlsxwriter emitted a UserWarning when writing a cell containing a URL that exceeds its internal limits (too long or too many URLs in the sheet), even when the code already handles those cases gracefully by falling back to plain-string writing.

Notes

• warnings.catch_warnings() + filterwarnings('ignore', message='Ignoring URL', ...) wraps each sheet_.write() call in Export._append_row_to_sheet
• The fallback to write_string() on non-zero return code is unchanged
• Both test_xlsx_too_many_urls now assert the warning is not raised (via filterwarnings('error', ...))

Preview steps

• Run pytest tests/test_exports.py::TestFormPackExport::test_xlsx_too_many_urls -m slow — should pass with no warnings
• Comment lines, the test should not pass

[coveralls]

coverage: 86.847% (+0.01%) from 86.834% — dev-2020-suppress-xlsxwriter-url-warning into main

[noliveleger]

@greptileai review

[greptile-apps]

Greptile Summary

This PR suppresses xlsxwriter UserWarnings that were emitted for URLs exceeding internal limits, even though the code already handled those cases by falling back to plain-string writing. It moves warnings.catch_warnings() to wrap the entire submission-processing loop in to_xlsx, and adds a filterwarnings('error', ...) guard in test_xlsx_too_many_urls to verify the warning is fully suppressed end-to-end.

• export.py: Added a single warnings.catch_warnings() context wrapping the entire parse_submissions loop, filtering out 'Ignoring URL' UserWarnings from xlsxwriter — replacing an earlier per-cell approach (flagged in a prior review) with one setup/teardown for the whole export.
• test_exports.py: Updated test_xlsx_too_many_urls to treat the target warning as an error, so any regression that re-enables it will immediately fail the test.
• xlsform_parameters.py: Minor cleanup — uses a raw string literal r'\s+' for the regex pattern.

Confidence Score: 5/5

Safe to merge — the change is narrowly scoped to suppressing a cosmetic warning that was already handled gracefully, and the existing fallback logic is untouched.

The catch_warnings context is now correctly placed at the outermost loop, addressing the previous per-cell overhead concern. The fallback write path and error-handling logic in _append_row_to_sheet are unchanged. The new filterwarnings('error', ...) guard in the test confirms the suppression is effective end-to-end. No functional logic was altered.

No files require special attention.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["to_xlsx(submissions)"] --> B["warnings.catch_warnings()"]
    B --> C["filterwarnings('ignore', 'Ignoring URL', UserWarning, xlsxwriter)"]
    C --> D["for chunk in parse_submissions(submissions)"]
    D --> E["for section_name, rows in chunk.items()"]
    E --> F["resolve/create sheet"]
    F --> G["_append_row_to_sheet(header)"]
    G --> H["for row in rows: _append_row_to_sheet(row)"]
    H --> I{"sheet_.write() return code"}
    I -->|"== 0"| J["Cell written OK"]
    I -->|"!= 0 (URL too long/many)"| K["sheet_.write_string() fallback"]
    K --> L{"write_string return code"}
    L -->|"-1"| M["raise FormPackExcelError"]
    L -->|"-2"| N["Prepend truncation warning, write again"]
    L -->|"0"| O["Cell written as plain string"]
    H --> P["More rows?"]
    P -->|"Yes"| H
    P -->|"No"| Q["workbook.close()"]

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
flowchart TD
    A["to_xlsx(submissions)"] --> B["warnings.catch_warnings()"]
    B --> C["filterwarnings('ignore', 'Ignoring URL', UserWarning, xlsxwriter)"]
    C --> D["for chunk in parse_submissions(submissions)"]
    D --> E["for section_name, rows in chunk.items()"]
    E --> F["resolve/create sheet"]
    F --> G["_append_row_to_sheet(header)"]
    G --> H["for row in rows: _append_row_to_sheet(row)"]
    H --> I{"sheet_.write() return code"}
    I -->|"== 0"| J["Cell written OK"]
    I -->|"!= 0 (URL too long/many)"| K["sheet_.write_string() fallback"]
    K --> L{"write_string return code"}
    L -->|"-1"| M["raise FormPackExcelError"]
    L -->|"-2"| N["Prepend truncation warning, write again"]
    L -->|"0"| O["Cell written as plain string"]
    H --> P["More rows?"]
    P -->|"Yes"| H
    P -->|"No"| Q["workbook.close()"]

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_{Reviews (4): Last reviewed commit: "tests: fix Python 3.12 SyntaxWarning" | Re-trigger Greptile}

[rgraber]

LGTM