fix(libreoffice): don't force MS Word 97 infilter on .wps (#585)

* fix(libreoffice): don't force MS Word 97 infilter on .wps

.wps is Microsoft Works, not MS Word 97/.doc. Forcing that infilter
makes soffice reject a genuine Works document with "source file could
not be loaded", even though the same file converts fine when no
--infilter is passed at all (LibreOffice auto-detects it correctly).

Fixes #582

* test: lock in wps export direction; document why null covers both sides

Per review: the filter map feeds both --infilter and the --convert-to
suffix, so wps: null also affects exporting TO wps. That is deliberate
and behavior-preserving: LibreOffice has no Works export filter (its
MS_Works filter is import-only), and bare `--convert-to wps` falls back
to LibreOffice's default export filter for the extension - "MS Word 97",
the exact filter this map pinned before, so export output is unchanged.
Adds a regression test asserting the docx -> wps invocation.

---------

Co-authored-by: tr3lane <182920672+tr3lane@users.noreply.github.com>

Author: tr3lane

src/converters/libreoffice.ts

@@ -77,7 +77,7 @@ export const properties = {
 
 type FileCategories = "text" | "calc";
 
-const filters: Record<FileCategories, Record<string, string>> = {
+const filters: Record<FileCategories, Record<string, string | null>> = {
   text: {
     "602": "T602Document",
     abw: "AbiWord",
@@ -113,7 +113,20 @@ const filters: Record<FileCategories, Record<string, string>> = {
     txt: "Text",
     wn: "WriteNow",
     wpd: "WordPerfect",
-    wps: "MS Word 97",
+    // .wps is Microsoft Works, not MS Word 97/.doc - forcing the "MS Word 97"
+    // filter makes soffice reject a genuine Works document with "source file
+    // could not be loaded", even though it converts the same file fine with
+    // no --infilter at all (LibreOffice auto-detects it correctly).
+    //
+    // null is deliberate for BOTH directions here, not just the import side:
+    // this map feeds both --infilter (import) and the --convert-to suffix
+    // (export). On import, null lets LibreOffice auto-detect - its Works
+    // import filter (MS_Works, libwps-backed) is import-only, so it can only
+    // be reached via auto-detection anyway. On export, LibreOffice has no
+    // Works export filter at all; bare `--convert-to wps` falls back to its
+    // default export filter for the extension, which is "MS Word 97" - the
+    // exact filter this map pinned before, so export output is unchanged.
+    wps: null,
     wpt: "MS Word 97 Vorlage",
     wri: "MS_Write",
     xhtml: "HTML (StarWriter)",

tests/converters/libreoffice.test.ts

@@ -102,6 +102,49 @@ test("uses only infilter when convertTo has no out filter (e.g., docx -> pdf)",
   expect(args.slice(-2)).toEqual(["out", "in.docx"]);
 });
 
+test("does not force an infilter for wps (Microsoft Works, not MS Word 97)", async () => {
+  // Regression test for https://github.com/C4illin/ConvertX/issues/582 -
+  // forcing --infilter="MS Word 97" on a genuine .wps file makes soffice
+  // reject it with "source file could not be loaded". No forced infilter
+  // lets LibreOffice auto-detect the real format instead.
+  await convert("in.wps", "wps", "docx", "out/out.docx", undefined, mockExecFile);
+
+  const { args } = requireDefined(calls[0], "Expected at least one execFile call");
+
+  expect(args).toEqual([
+    "--headless",
+    "--convert-to",
+    "docx:MS Word 2007 XML",
+    "--outdir",
+    "out",
+    "in.wps",
+  ]);
+  expect(args.some((a) => a.startsWith("--infilter"))).toBe(false);
+});
+
+test("does not force an outfilter for wps as an export target either", async () => {
+  // wps shares one filter-map entry for both directions (see the comment in
+  // libreoffice.ts) - docx's own infilter is still emitted (that describes
+  // the real source file), but no --convert-to wps:<filter> suffix is
+  // forced. Verified against a real soffice: this exact invocation succeeds,
+  // with LibreOffice's default export filter for .wps ("MS Word 97" - the
+  // same filter the map pinned before this change, so output is unchanged).
+  // LibreOffice has no Works export filter, so no suffix could do better.
+  await convert("in.docx", "docx", "wps", "out/out.wps", undefined, mockExecFile);
+
+  const { args } = requireDefined(calls[0], "Expected at least one execFile call");
+
+  expect(args).toEqual([
+    "--headless",
+    "--infilter=MS Word 2007 XML",
+    "--convert-to",
+    "wps",
+    "--outdir",
+    "out",
+    "in.docx",
+  ]);
+});
+
 test("strips leading './' from outdir", async () => {
   await convert("in.txt", "txt", "docx", "./out/out.docx", undefined, mockExecFile);