raw derive: a placeholder text/plain no longer displaces the HTML text of a mail (#204)
A mail's text is its plain text unless that is under 10% of the HTML text, then the HTML text with a warning; one rule for .eml and .msg. The other version of the text in a multipart/alternative is no longer an attachment. Files changed: - CHANGES.md - VERSION - docs/reference/commands/raw-material-and-uploads.md - testfiles/mail/gog-roundcube.eml.expect - tools/CONTRACT.md - tools/chemenu/commands/raw_cmd.py - tools/chemenu/filters/mail.py - tools/chemenu/filters/msg.py - tools/chemenu/tests/test_raw_derive.py - tools/chemenu/tests/test_raw_derive_binary.py Co-Authored-By: Claude Code <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2
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@@ -14,7 +14,7 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
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---
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## 9.0.0-beta.19 - 2026-10-09 - testfiles: real documents get short names and a source table, personal data is replaced by same-length filler, and the derive test now compares the sheet TSVs (#203)
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## 9.0.0-beta.20 - 2026-10-09 - raw derive (Mail): ein Platzhalter-Plaintext (unter 10 % des HTML-Texts) verdrängt den HTML-Text nicht mehr, und die zweite Fassung des Mailtexts wird kein Anhang (#204)
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**Author:** Torben Nehmer
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@@ -38,6 +38,7 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
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- raw derive reads PDF-free documents: Office files and mail become a folder with the original and a derived text
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- raw derive unpacks ZIP archives and mails with attachments into a folder
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- raw derive reads PDF and Outlook MSG through lazily imported packages; doctor shows each import filter
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- raw derive (Mail): ein Platzhalter-Plaintext (unter 10 % des HTML-Texts) verdrängt den HTML-Text nicht mehr, und die zweite Fassung des Mailtexts wird kein Anhang (#204)
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**Low impact**
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- version bump: Abschlussmeldung nennt Stichpunkt oder Themenabsatz statt pauschal Prosa
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@@ -118,7 +118,7 @@ tools/wikitool raw derive incoming/scans.zip
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- A single file directly in `incoming/` becomes a folder named after its stem (or `--name`) holding `original.<ext>` - the original bytes, moved - and `derived.md`. The fixed names keep the path inside the path budget; the header of `derived.md` records the file's own name as `original_name`.
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- A folder is derived in place: each file with a filter gets `<stem>.md` beside it, nothing is renamed, and the files without a filter are named in the output.
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- `derived.md` starts with a fixed header (`derived_by`, `filter`, `engine`, `derived`, `derived_from`, `original_name` for a renamed file, `title`, then the fields of the format) followed by the derived text. The same bytes always give the same text; only `derived` differs between runs. `engine` names the tool version and, where a package reads the format, its version.
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- Formats: web pages (`.html`), Word (`.docx`), PowerPoint (`.pptx`), Excel (`.xlsx`, `.xlsm`), e-mail (`.eml`) and ZIP archives (`.zip`), read with the standard library only; PDF (`.pdf`, `pypdf`) and Outlook messages (`.msg`, `olefile`), each read by a package in `tools/requirements.txt` that is imported only when such a file is derived. A missing package refuses that format alone, with the preflight hint; `wikitool doctor` shows one `import-filter-<name>` line per package-backed format. A PDF gets `<!-- page N -->` markers and a WARN when it yields almost no text (a scan; there is no OCR); an encrypted PDF is refused. A `.msg` is a container like an `.eml`; an embedded message inside it is named, not read.
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- Formats: web pages (`.html`), Word (`.docx`), PowerPoint (`.pptx`), Excel (`.xlsx`, `.xlsm`), e-mail (`.eml`) and ZIP archives (`.zip`), read with the standard library only; PDF (`.pdf`, `pypdf`) and Outlook messages (`.msg`, `olefile`), each read by a package in `tools/requirements.txt` that is imported only when such a file is derived. A missing package refuses that format alone, with the preflight hint; `wikitool doctor` shows one `import-filter-<name>` line per package-backed format. A PDF gets `<!-- page N -->` markers and a WARN when it yields almost no text (a scan; there is no OCR); an encrypted PDF is refused. A `.msg` is a container like an `.eml`; an embedded message inside it is named, not read. The text of a mail (`.eml` and `.msg` alike) is its plain text, unless that is under 10% of the length of the HTML text - a "plain text version not available" placeholder - in which case it is the HTML text and a WARN names both lengths. The other version of the text in a `multipart/alternative` is not an attachment.
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- A workbook (`.xlsx`, `.xlsm`) gets its cells as files: beside its `.md` a folder `<md stem>.sheets/` (`derived.sheets/` for a single file) holds one `NN-<sheet>.tsv` per sheet - tab-separated per RFC 4180, UTF-8, row 1 of the file is row 1 of the sheet - and, for a sheet with formulas, `NN-<sheet>.formulas.tsv` listing cell, formula and last stored value. The `.md` is the overview: one section per sheet with its range, the file names and a preview. Formulas are not recalculated; a shared formula is written out per cell, and one that cannot be is named `shared:<master cell>` with a WARN. The folder counts against the path budget and is accepted with the rest; an existing one is never overwritten.
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- A ZIP and a mail are containers. A ZIP at the top of `incoming/` becomes the folder `incoming/<stem>/` holding its files under their own names, each with a `<stem>.md` where a filter reads it; the ZIP is removed and the output names it with its sha256. A mail becomes a folder with `original.eml`, `derived.md` and its attachments under their own names; a ZIP attached to it is unpacked once into a folder of its own, and an attached mail is quoted in `derived.md`, not unpacked. A ZIP inside a ZIP, an absolute or `..` path, a symbolic link, an encrypted entry, more than 1000 entries, a file over 25 MiB or more than 250 MiB in total refuse the whole call. Hidden entries (`__MACOSX/`, `.DS_Store`, anything starting with a dot) are named, not written. A name taken twice, or reserved (`original.*` and `derived.md` at the top of a mail's folder, `_capture.json` anywhere), gets `-2`, `-3` before its extension, and the output lists each rename.
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- A name already taken under `raw/` is a WARN, not a refusal: whether the folder is a later edition of that source or a separate one is the human's call. A later edition of a derived source is replaced file by file with `raw accept --replaces`; there is no `--replaces-bundle` for it.
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@@ -0,0 +1,3 @@
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# the text is in the HTML part only; the plain-text part is a one-line placeholder
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Silent Hill: Townfall
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JETZT KAUFEN
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+1
-1
@@ -1515,7 +1515,7 @@ Derive reading text from a PDF, e-mail, Office file or web page in `incoming/`,
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- A single file directly in `incoming/` becomes a folder named after its stem (or `--name`) holding `original.<ext>` - the original bytes, moved - and `derived.md`. The fixed names keep the path inside the path budget; the header of `derived.md` records the file's own name as `original_name`.
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- A folder is derived in place: each file with a filter gets `<stem>.md` beside it, nothing is renamed, and the files without a filter are named in the output.
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- `derived.md` starts with a fixed header (`derived_by`, `filter`, `engine`, `derived`, `derived_from`, `original_name` for a renamed file, `title`, then the fields of the format) followed by the derived text. The same bytes always give the same text; only `derived` differs between runs. `engine` names the tool version and, where a package reads the format, its version.
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- Formats: web pages (`.html`), Word (`.docx`), PowerPoint (`.pptx`), Excel (`.xlsx`, `.xlsm`), e-mail (`.eml`) and ZIP archives (`.zip`), read with the standard library only; PDF (`.pdf`, `pypdf`) and Outlook messages (`.msg`, `olefile`), each read by a package in `tools/requirements.txt` that is imported only when such a file is derived. A missing package refuses that format alone, with the preflight hint; `wikitool doctor` shows one `import-filter-<name>` line per package-backed format. A PDF gets `<!-- page N -->` markers and a WARN when it yields almost no text (a scan; there is no OCR); an encrypted PDF is refused. A `.msg` is a container like an `.eml`; an embedded message inside it is named, not read.
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- Formats: web pages (`.html`), Word (`.docx`), PowerPoint (`.pptx`), Excel (`.xlsx`, `.xlsm`), e-mail (`.eml`) and ZIP archives (`.zip`), read with the standard library only; PDF (`.pdf`, `pypdf`) and Outlook messages (`.msg`, `olefile`), each read by a package in `tools/requirements.txt` that is imported only when such a file is derived. A missing package refuses that format alone, with the preflight hint; `wikitool doctor` shows one `import-filter-<name>` line per package-backed format. A PDF gets `<!-- page N -->` markers and a WARN when it yields almost no text (a scan; there is no OCR); an encrypted PDF is refused. A `.msg` is a container like an `.eml`; an embedded message inside it is named, not read. The text of a mail (`.eml` and `.msg` alike) is its plain text, unless that is under 10% of the length of the HTML text - a "plain text version not available" placeholder - in which case it is the HTML text and a WARN names both lengths. The other version of the text in a `multipart/alternative` is not an attachment.
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- A workbook (`.xlsx`, `.xlsm`) gets its cells as files: beside its `.md` a folder `<md stem>.sheets/` (`derived.sheets/` for a single file) holds one `NN-<sheet>.tsv` per sheet - tab-separated per RFC 4180, UTF-8, row 1 of the file is row 1 of the sheet - and, for a sheet with formulas, `NN-<sheet>.formulas.tsv` listing cell, formula and last stored value. The `.md` is the overview: one section per sheet with its range, the file names and a preview. Formulas are not recalculated; a shared formula is written out per cell, and one that cannot be is named `shared:<master cell>` with a WARN. The folder counts against the path budget and is accepted with the rest; an existing one is never overwritten.
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- A ZIP and a mail are containers. A ZIP at the top of `incoming/` becomes the folder `incoming/<stem>/` holding its files under their own names, each with a `<stem>.md` where a filter reads it; the ZIP is removed and the output names it with its sha256. A mail becomes a folder with `original.eml`, `derived.md` and its attachments under their own names; a ZIP attached to it is unpacked once into a folder of its own, and an attached mail is quoted in `derived.md`, not unpacked. A ZIP inside a ZIP, an absolute or `..` path, a symbolic link, an encrypted entry, more than 1000 entries, a file over 25 MiB or more than 250 MiB in total refuse the whole call. Hidden entries (`__MACOSX/`, `.DS_Store`, anything starting with a dot) are named, not written. A name taken twice, or reserved (`original.*` and `derived.md` at the top of a mail's folder, `_capture.json` anywhere), gets `-2`, `-3` before its extension, and the output lists each rename.
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- A name already taken under `raw/` is a WARN, not a refusal: whether the folder is a later edition of that source or a separate one is the human's call. A later edition of a derived source is replaced file by file with `raw accept --replaces`; there is no `--replaces-bundle` for it.
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@@ -2177,7 +2177,11 @@ def _derive_next(target: Path) -> str:
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"doctor` shows one `import-filter-<name>` line per package-backed format. A PDF gets "
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"`<!-- page N -->` markers and a WARN when it yields almost no text (a scan; there is "
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"no OCR); an encrypted PDF is refused. A `.msg` is a container like an `.eml`; an "
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"embedded message inside it is named, not read.",
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"embedded message inside it is named, not read. The text of a mail (`.eml` and `.msg` "
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"alike) is its plain text, unless that is under 10% of the length of the HTML text - a "
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"\"plain text version not available\" placeholder - in which case it is the HTML text "
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"and a WARN names both lengths. The other version of the text in a "
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"`multipart/alternative` is not an attachment.",
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"A workbook (`.xlsx`, `.xlsm`) gets its cells as files: beside its `.md` a folder "
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"`<md stem>.sheets/` (`derived.sheets/` for a single file) holds one `NN-<sheet>.tsv` "
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"per sheet - tab-separated per RFC 4180, UTF-8, row 1 of the file is row 1 of the sheet "
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@@ -39,6 +39,24 @@ class ParsedMail:
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inline_images: int = 0
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PLAIN_MIN_SHARE = 0.10
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def choose_text(plain: str, html_text: str) -> tuple[str, bool, Optional[str]]:
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"""The mail text from its two versions, both stripped: the plain text, unless it is
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shorter than `PLAIN_MIN_SHARE` of the HTML text (a "plain text version not available"
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placeholder). Returns the text, whether it came from the HTML, and a warning if the
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plain text was passed over. Shared by `.eml` and `.msg`."""
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if not plain:
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return html_text, bool(html_text), None
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if html_text and len(plain) < PLAIN_MIN_SHARE * len(html_text):
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return html_text, True, (
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f"The plain text ({len(plain)} characters) is under {PLAIN_MIN_SHARE:.0%} of the HTML text "
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f"({len(html_text)} characters); the text is taken from the HTML part."
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)
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return plain, False, None
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def _header(msg: EmailMessage, name: str) -> str:
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try:
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return re.sub(r"\s+", " ", str(msg[name] or "")).strip()
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@@ -100,6 +118,36 @@ def _leaves(part: EmailMessage):
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yield from _leaves(child)
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def _other_versions(msg: EmailMessage, body_part: Optional[EmailMessage]) -> set[int]:
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"""The text/plain and text/html leaves under the nearest `multipart/alternative` that holds
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the chosen body part: other versions of the mail text, not attachments. A part that is
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explicitly an attachment stays one."""
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if body_part is None:
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return set()
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def holder(part: EmailMessage, alternative: Optional[EmailMessage]) -> Optional[EmailMessage]:
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if part is body_part:
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return alternative
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if part.get_content_type() == "message/rfc822" or not part.is_multipart():
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return None
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nearest = part if part.get_content_type() == "multipart/alternative" else alternative
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for child in part.iter_parts():
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found = holder(child, nearest)
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if found is not None:
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return found
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return None
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alternative = holder(msg, None)
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if alternative is None:
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return set()
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return {
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id(leaf)
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for leaf in _leaves(alternative)
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if leaf.get_content_type() in ("text/plain", "text/html")
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and (leaf.get_content_disposition() or "").lower() != "attachment"
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}
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def parse(data: bytes) -> ParsedMail:
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msg = message_from_bytes(data, policy=policy.default)
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if not isinstance(msg, EmailMessage) or not (msg.keys() or msg.get_payload()):
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@@ -113,15 +161,21 @@ def parse(data: bytes) -> ParsedMail:
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"subject": _header(msg, "subject"),
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"message_id": _header(msg, "message-id"),
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}
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body_part: Optional[EmailMessage] = msg.get_body(preferencelist=("plain", "html"))
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if body_part is None:
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plain_part: Optional[EmailMessage] = msg.get_body(preferencelist=("plain",))
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html_part: Optional[EmailMessage] = msg.get_body(preferencelist=("html",))
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body_part: Optional[EmailMessage] = None
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if plain_part is None and html_part is None:
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out.warnings.append("The mail has no text/plain or text/html body (RTF-only or empty); the text is empty.")
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elif body_part.get_content_type() == "text/html":
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out.body = web_capture.derive_text(_text_of(body_part), "").strip()
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else:
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out.body = _text_of(body_part).replace("\r\n", "\n").replace("\r", "\n").strip()
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plain = _text_of(plain_part).replace("\r\n", "\n").replace("\r", "\n").strip() if plain_part is not None else ""
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html_text = web_capture.derive_text(_text_of(html_part), "").strip() if html_part is not None else ""
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out.body, from_html, warning = choose_text(plain, html_text)
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if warning:
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out.warnings.append(warning)
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body_part = html_part if from_html or plain_part is None else plain_part
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versions = _other_versions(msg, body_part)
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for number, part in enumerate(_leaves(msg), 1):
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if part is body_part or part is msg:
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if part is body_part or part is msg or id(part) in versions:
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continue
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disposition = (part.get_content_disposition() or "").lower()
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if (
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@@ -1,7 +1,8 @@
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"""Outlook `.msg` (a compound file), read with `olefile` (imported when one is derived).
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Only what a reader of the mail needs: the headers, the body (plain text, else HTML)
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and the attachments by name and bytes. The result is the same `ParsedMail` an `.eml`
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Only what a reader of the mail needs: the headers, the body (plain text, else HTML;
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HTML too when the plain text is under 10% of it - `mail.choose_text`) and the
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attachments by name and bytes. The result is the same `ParsedMail` an `.eml`
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yields, so everything after the parsing is shared with `mail.py`.
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"""
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from __future__ import annotations
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@@ -17,7 +18,7 @@ from typing import Optional
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from chemenu import web_capture
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from chemenu.errors import ValidationError
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from chemenu.filters import register
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from chemenu.filters.mail import Attachment, EmlFilter, ParsedMail
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from chemenu.filters.mail import Attachment, EmlFilter, ParsedMail, choose_text
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_SUBJECT = "0037"
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_BODY = "1000"
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@@ -129,12 +130,12 @@ def _html_text(raw: bytes) -> str:
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def _body(message: _Message, out: ParsedMail) -> None:
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plain = message.text(_BODY)
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plain = message.text(_BODY).replace("\r\n", "\n").replace("\r", "\n").strip()
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html = message.raw(_HTML)
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if plain:
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out.body = plain.replace("\r\n", "\n").replace("\r", "\n").strip()
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elif html:
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out.body = _html_text(html)
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if plain or html:
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out.body, _from_html, warning = choose_text(plain, _html_text(html) if html else "")
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if warning:
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out.warnings.append(warning)
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else:
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what = "has only an RTF body" if message.raw(_RTF) else "has no body"
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out.warnings.append(f"The message {what}, which raw derive does not read; the text is empty.")
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@@ -182,8 +182,8 @@ def _text_cell(ref: str, text: str) -> str:
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return f'<c r="{ref}" t="inlineStr"><is><t xml:space="preserve">{text.replace(chr(13), " ")}</t></is></c>'
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def make_eml(body: str = "Hallo Welt\n", *, html: str = "", attach: bool = False, inline: bool = False,
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subject: str = "Angebot") -> bytes:
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def make_eml(body: str = "Hallo Welt\n", *, html: str = "", alternative: str = "", attach: bool = False,
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inline: bool = False, subject: str = "Angebot") -> bytes:
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msg = EmailMessage()
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msg["From"] = "Anna Beispiel <anna@example.org>"
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msg["To"] = "bob@example.org, Carla <carla@example.org>"
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@@ -194,6 +194,8 @@ def make_eml(body: str = "Hallo Welt\n", *, html: str = "", attach: bool = False
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msg.set_content(html, subtype="html")
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else:
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msg.set_content(body)
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if alternative:
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msg.add_alternative(alternative, subtype="html")
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if inline:
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msg.add_related(b"\x89PNG", maintype="image", subtype="png", cid="<logo@x>")
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if attach:
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@@ -752,6 +754,87 @@ def test_eml_with_inline_image_warns_and_is_not_an_attachment(tree, capsys):
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assert "inline image" in capsys.readouterr().out
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_NEWSLETTER = "<html><body><h1>Newsletter</h1><p>" + "Real content of the mail. " * 20 + "</p></body></html>"
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def _eml_parsed(data: bytes):
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from chemenu.filters import mail
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return mail.parse(data)
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def test_eml_placeholder_plain_text_gives_way_to_the_html_text(tree, capsys):
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_put(tree, "mail.eml", make_eml("Plain text version not available", alternative=_NEWSLETTER))
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_derive("incoming/mail.eml")
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out = capsys.readouterr().out
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header, text = _header_and_text(tree / "incoming/mail/derived.md")
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assert "Real content of the mail." in text and "not available" not in text
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assert "The plain text (32 characters) is under 10% of the HTML text" in out
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assert header["attachments"] == []
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assert sorted(p.name for p in (tree / "incoming/mail").iterdir()) == ["derived.md", "original.eml"]
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def test_eml_good_plain_text_wins_over_html_without_a_warning(tree, capsys):
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plain = "Real content of the mail. " * 18
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_put(tree, "mail.eml", make_eml(plain, alternative=_NEWSLETTER))
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_derive("incoming/mail.eml")
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out = capsys.readouterr().out
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header, text = _header_and_text(tree / "incoming/mail/derived.md")
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assert text.strip() == plain.strip()
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assert "is under" not in out
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assert header["attachments"] == []
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def test_eml_keeps_a_real_attachment_beside_the_two_text_versions(tree):
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_put(tree, "mail.eml", make_eml("Plain text version not available", alternative=_NEWSLETTER, attach=True))
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_derive("incoming/mail.eml")
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header, _text = _header_and_text(tree / "incoming/mail/derived.md")
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assert header["attachments"] == ["a.bin"]
|
||||
assert (tree / "incoming/mail/a.bin").read_bytes() == b"data"
|
||||
|
||||
|
||||
def test_eml_html_inside_a_related_group_is_still_a_text_version_and_its_image_is_inline():
|
||||
msg = EmailMessage()
|
||||
msg["Subject"] = "S"
|
||||
msg.set_content("Plain text version not available")
|
||||
msg.add_alternative(_NEWSLETTER, subtype="html")
|
||||
msg.get_payload()[1].add_related(b"\x89PNG", maintype="image", subtype="png", cid="<logo@x>")
|
||||
parsed = _eml_parsed(msg.as_bytes())
|
||||
|
||||
assert "Real content of the mail." in parsed.body
|
||||
assert parsed.attachments == []
|
||||
assert parsed.inline_images == 1
|
||||
|
||||
|
||||
def test_eml_text_version_marked_as_an_attachment_stays_one():
|
||||
msg = EmailMessage()
|
||||
msg["Subject"] = "S"
|
||||
msg.set_content("Hello there\n")
|
||||
msg.add_alternative(_NEWSLETTER, subtype="html")
|
||||
msg.get_payload()[1].add_header("Content-Disposition", "attachment", filename="version.html")
|
||||
parsed = _eml_parsed(msg.as_bytes())
|
||||
|
||||
assert parsed.body == "Hello there"
|
||||
assert [a.name for a in parsed.attachments] == ["version.html"]
|
||||
|
||||
|
||||
def test_eml_plain_and_html_in_a_mixed_mail_without_alternative_keep_the_html_as_attachment():
|
||||
msg = EmailMessage()
|
||||
msg["Subject"] = "S"
|
||||
msg.set_content("Hello there. " * 40)
|
||||
msg.make_mixed()
|
||||
html = EmailMessage()
|
||||
html.set_content(_NEWSLETTER, subtype="html")
|
||||
msg.attach(html)
|
||||
parsed = _eml_parsed(msg.as_bytes())
|
||||
|
||||
assert parsed.body == ("Hello there. " * 40).strip()
|
||||
assert len(parsed.attachments) == 1
|
||||
|
||||
|
||||
# --- the registry -----------------------------------------------------------
|
||||
|
||||
|
||||
|
||||
@@ -165,6 +165,32 @@ def test_a_msg_with_only_html_takes_the_html_text(tree):
|
||||
assert "Only" in text and "html here" in text and "<p>" not in text
|
||||
|
||||
|
||||
_HTML_BODY = "<html><body><p>" + "Real content of the mail. " * 20 + "</p></body></html>"
|
||||
|
||||
|
||||
@needs_olefile
|
||||
def test_a_msg_with_a_placeholder_plain_text_takes_the_html_text_and_warns(tree, capsys):
|
||||
_put(tree, "p.msg", build_msg(subject="S", body="Plain text version not available", html=_HTML_BODY))
|
||||
_derive("incoming/p.msg")
|
||||
out = capsys.readouterr().out
|
||||
_header, text = _header_and_text(tree / "incoming/p/derived.md")
|
||||
|
||||
assert "Real content of the mail." in text and "not available" not in text
|
||||
assert "The plain text (32 characters) is under 10% of the HTML text" in out
|
||||
|
||||
|
||||
@needs_olefile
|
||||
def test_a_msg_with_a_good_plain_text_keeps_it_without_a_warning(tree, capsys):
|
||||
plain = "Real content of the mail. " * 18
|
||||
_put(tree, "g.msg", build_msg(subject="S", body=plain, html=_HTML_BODY))
|
||||
_derive("incoming/g.msg")
|
||||
out = capsys.readouterr().out
|
||||
_header, text = _header_and_text(tree / "incoming/g/derived.md")
|
||||
|
||||
assert text.strip() == plain.strip()
|
||||
assert "is under" not in out
|
||||
|
||||
|
||||
@needs_olefile
|
||||
def test_a_msg_with_only_rtf_warns_and_has_no_text(tree, capsys):
|
||||
_put(tree, "r.msg", build_msg(subject="S", rtf=b"{\\rtf1 hello}"))
|
||||
|
||||
Reference in new issue
Block a user