Match the loader's two-row floor, and record that an extension may name two media types

README.md

@@ -163,8 +163,8 @@ Each locale carries `address`, `color`, `company`, `date`, `email`, `first-name`
 `personnummer` and `samordningsnummer`, `en_US` adds `ssn` and `itin`. `misc`
 carries `car`, `coordinate`, `country` (ISO 3166), `creditcard` (Luhn-valid),
 `currency` (ISO 4217), `datetime` (RFC 3339), `emoji`, `httpstatus`, `language`
-(ISO 639-1, with its 639-2/T code), `mac`, `mimetype`, `objectid`, `timezone` (IANA),
-`useragent` and `uuid` (v4). Many carry sub-fields — `misc.currency.symbol`,
+(ISO 639-1, with its 639-2/T code), `mac`, `mimetype`, `objectid`, `timezone`
+(IANA), `useragent` and `uuid` (v4). Many carry sub-fields — `misc.currency.symbol`,
 `misc.country.alpha2`, `misc.httpstatus.code` — which `--list` shows. `country`,
 `currency`, `httpstatus`, `language` and `mimetype` are [tables](#table), so
 `misc.country[SE].capital` and `misc.currency[Euro].symbol` select a row;
@@ -1130,6 +1130,11 @@ App developers writing tests and fixtures, in Go and at a shell:
   and VED beside VES, both Venezuela's, of which a country row names one. Linking
   would trade the register for the link, and `misc.country.currency` already pairs a
   country with its currency in one draw.
+- **An extension may name two media types.** `.xml`, `.rtf`, `.sub`, `.mpp` and `.ac`
+  each name two rows of `misc.mimetype`. Separating them would mean dropping a
+  registered type, or naming one by an extension that is not its own — `.mpt` is
+  Project's template, not its document. Selecting such a name is an error listing
+  both keys; select by type instead.
 - **The Swedish ids draw Skatteverket's test series.** A Luhn-valid personnummer
   over a random birth number may be a living person's; 238 and 239 after any date
   are blocked from assignment, so the shipped `personnummer` and

data-import/mimetype.py

@@ -16,7 +16,6 @@ SOURCE = "https://raw.githubusercontent.com/jshttp/mime-db/master/db.json"
 OUT = Path(__file__).resolve().parent.parent / "data" / "misc" / "mimetype.tsv"
 CACHE = Path(__file__).resolve().parent / "cache"
 COLUMNS = ["ext", "type"]
-# mime-db lists extensions in no particular order, so where the everyday one is not first, name it.
 FIXUPS = {"application/mp4": "mp4s", "audio/mpeg": "mp3", "audio/ogg": "ogg", "video/quicktime": "mov"}
 
 

data-import/tsv.py

@@ -5,14 +5,14 @@ from pathlib import Path
 
 
 def write(path, columns, rows):
-    """Write the rows as a TSV; the table needs a row, and every cell must be non-empty and free of tabs, newlines and braces."""
+    """Write the rows as a TSV; the table needs two rows, and every cell must be non-empty and free of tabs, newlines and braces."""
     lines = ["\t".join(columns)]
     for row in rows:
         cells = [str(row[c]) for c in columns]
         if not all(cells) or any(re.search(r"[\t\n{}]", c) for c in cells):
             raise ValueError(f"{path}: a cell is empty or holds a tab, newline or brace: {row}")
         lines.append("\t".join(cells))
-    if len(lines) < 2:
-        raise ValueError(f"{path}: has no rows below its header; a table is at least two rows")
+    if len(lines) < 3:
+        raise ValueError(f"{path}: has {len(lines) - 1} rows below its header; a table is at least two rows")
     Path(path).write_text("\n".join(lines) + "\n", encoding="utf-8")
     print(f"{path}: {len(lines) - 1} rows", file=sys.stderr)