Change line endings to unix, write file using IO package

gap/gaptypes.g

-# Load into GAP using Read("gaptypes.g"); and export using
-# GAPTypesToJson("gap_types.json");
-
-LoadPackage("json");
-
-GAPFilterToFilterType := function(fid)
-    if INFO_FILTERS[fid] in FNUM_CATS then
-        return "GAP_Category";
-    elif INFO_FILTERS[fid] in FNUM_REPS then
-        return "GAP_Representation";
-    elif INFO_FILTERS[fid] in FNUM_ATTS then
-        return "GAP_Attribute";
-    elif INFO_FILTERS[fid] in FNUM_PROS then
-        return "GAP_Property";
-    elif INFO_FILTERS[fid] in FNUM_TPRS then
-        return "GAP_Tester";
-    else
-        return "GAP_Filter";
-    fi;
-end;
-
-# Make GAP Type graph as a record
-GAPTypesInfo := function()
-    local  res, lres, i, ff;
-
-    res := rec();
-
-    for i in [1..Length(FILTERS)] do
-        if IsBound(FILTERS[i]) then
-            lres := rec();
-
-            lres.type := GAPFilterToFilterType(i);
-
-            ff := TRUES_FLAGS(WITH_IMPS_FLAGS(FLAGS_FILTER(FILTERS[i])));
-            lres.implied := List(ff,
-                               function(f)
-                                   if IsBound(FILTERS[f]) then
-                                       return NAME_FUNC(FILTERS[f]);
-                                   else
-                                       return "<<unknown>>";
-                                   fi;
-                               end);
-            res.(NAME_FUNC(FILTERS[i])) := lres;
-        fi;
-    od;
-
-    return res;
-end;
-
-# Write the graph of type info to JSon file
-GAPTypesToJson := function(file)
-    PrintTo(file, GapToJsonString(GAPTypesInfo()));
-end;
-
+# Load into GAP using Read("gaptypes.g"); and export using
+# GAPTypesToJson("gap_types.json");
+
+LoadPackage("json");
+LoadPackage("io");
+
+
+GAPFilterToFilterType := function(fid)
+    if INFO_FILTERS[fid] in FNUM_CATS then
+        return "GAP_Category";
+    elif INFO_FILTERS[fid] in FNUM_REPS then
+        return "GAP_Representation";
+    elif INFO_FILTERS[fid] in FNUM_ATTS then
+        return "GAP_Attribute";
+    elif INFO_FILTERS[fid] in FNUM_PROS then
+        return "GAP_Property";
+    elif INFO_FILTERS[fid] in FNUM_TPRS then
+        return "GAP_Tester";
+    else
+        return "GAP_Filter";
+    fi;
+end;
+
+# Make GAP Type graph as a record
+GAPTypesInfo := function()
+    local  res, lres, i, ff;
+
+    res := rec();
+
+    for i in [1..Length(FILTERS)] do
+        if IsBound(FILTERS[i]) then
+            lres := rec();
+
+            lres.type := GAPFilterToFilterType(i);
+
+            ff := TRUES_FLAGS(WITH_IMPS_FLAGS(FLAGS_FILTER(FILTERS[i])));
+            lres.implied := List(ff,
+                               function(f)
+                                   if IsBound(FILTERS[f]) then
+                                       return NAME_FUNC(FILTERS[f]);
+                                   else
+                                       return "<<unknown>>";
+                                   fi;
+                               end);
+            res.(NAME_FUNC(FILTERS[i])) := lres;
+        fi;
+    od;
+
+    return res;
+end;
+
+# Write the graph of type info to JSon file
+GAPTypesToJson := function(file)
+    local fd, n;
+
+    fd := IO_File(file, "w");
+    if fd = fail then
+        Error("Opening file ", file, "failed.");
+    fi;
+    n := IO_Write(fd, GapToJsonString(GAPTypesInfo()));
+    IO_Close(fd);
+
+    return n;
+end;
+