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Paul Snyman
f7e5426792
describeBinary reports version="unknown" flavor="unknown" for every poppler
install, so logDiagnostics prints nothing useful on the most common
implementation. Two independent causes:
1. poppler writes the -v banner to stderr and exits 0. execFileSync returns
stdout (empty) and does not throw on a zero exit, so the stderr fallback in
the catch block is unreachable. The in-code comment already notes poppler
exits 0, but only the throwing path reads stderr.
2. flavor is matched against the version line alone. poppler prints
"pdftotext version 26.06.0" on line 1 and names itself on line 2,
"Copyright ... The Poppler Developers", so even a working stderr read
yields "unknown".
Switch the probe to spawnSync, which returns both streams regardless of exit
status, match the version banner rather than assuming line 0, and derive the
flavor from the full output.
Measured on poppler 26.06.0 (Homebrew, macOS), same machine and binary:
before: { version: "unknown", flavor: "unknown" }
after: { version: "pdftotext version 26.06.0", flavor: "poppler" }
xpdf is unaffected: it exits non-zero and names itself on line 1, so it
resolved correctly before and still does.
Tests use shell shims reproducing each vendor's banner, stream and exit status,
since a real pdftotext cannot be assumed present in CI. Two of the four fail on
this commit's parent; the xpdf and no-banner cases pass there and are included
as regression guards rather than red-proofs.