Change the way xz/lzma man pages are detected

This avoids the use of the global and puts the diagnostic message in a
self-contained location.

share/tools/create_manpage_completions.py

@@ -20,7 +20,6 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 import string, sys, re, os.path, bz2, gzip, traceback, getopt, errno, codecs
 from deroff import Deroffer
 
-lzma_printed_msg = False
 lzma_available = True
 try:
     try:
@@ -715,7 +714,7 @@ def parse_manpage_at_path(manpage_path, output_directory):
     filename = os.path.basename(manpage_path)
 
     # Clear diagnostics
-    global diagnostic_indent, lzma_printed_msg
+    global diagnostic_indent
     diagnostic_output[:] = []
     diagnostic_indent = 0
 
@@ -733,11 +732,6 @@ def parse_manpage_at_path(manpage_path, output_directory):
         if IS_PY3: manpage = manpage.decode('latin-1')
     elif manpage_path.endswith('.xz') or manpage_path.endswith('.lzma'):
         if not lzma_available:
-            if not lzma_printed_msg:
-                add_diagnostic('A man page is compressed with lzma or xz, but the "lzma" module is not available.'
-                               ' Skipping. (This message is only printed on the first occurrence.)',
-                               NOT_VERBOSE)
-                lzma_printed_msg = True
             return
         fd = lzma.LZMAFile(str(manpage_path), 'r')
         manpage = fd.read()
@@ -841,6 +835,15 @@ def parse_and_output_man_pages(paths, output_directory, show_progress):
     last_progress_string_length = 0
     if show_progress and not WRITE_TO_STDOUT:
         print("Parsing man pages and writing completions to {0}".format(output_directory))
+
+    man_page_suffixes = set([os.path.splitext(m)[1][1:] for m in paths])
+    lzma_xz_occurs = "xz" in man_page_suffixes or "lzma" in man_page_suffixes
+    if lzma_xz_occurs and not lzma_available:
+        add_diagnostic('At least one man page is compressed with lzma or xz, but the "lzma" module is not available.'
+                       ' Any man page compressed with either will be skipped.',
+                       NOT_VERBOSE)
+        flush_diagnostics(sys.stderr)
+
     for manpage_path in paths:
         index += 1