gnulib-tool.py: Make regular expression more strict.

[Collin Funk]

This regular expression should be much more strict. This patch should
fix it. The 'inttostr' module seems like the best way to show this:

diff --git a/pygnulib/GLModuleSystem.py b/pygnulib/GLModuleSystem.py
index fac29883f9..1724b250da 100644
--- a/pygnulib/GLModuleSystem.py
+++ b/pygnulib/GLModuleSystem.py
@@ -1039,6 +1039,8 @@ class GLModuleTable(object):
                     pattern = re.compile(r'^lib_SOURCES[\t ]*\+=([^#]*).*$', 
re.M)
                     for matching_rhs in pattern.findall(snippet):
                         files = matching_rhs.split(' ')
+                        if module.name == 'inttostr':
+                            print(files)
                         for file in files:
                             # Ignore .h files since they are not compiled.
                             if not file.endswith('.h'):

['', '', '', '', 'imaxtostr.c', '', '', '', 'inttostr.c', '', '', '', 
'offtostr.c', '', '', '', 'uinttostr.c', '', '', '', 
'umaxtostr.c\n\nEXTRA_DIST', '+=', 'anytostr.c', 
'inttostr.h\n\nEXTRA_lib_SOURCES', '+=', 'anytostr.c\n\n']

After this patch:

['imaxtostr.c', 'inttostr.c', 'offtostr.c', 'uinttostr.c', 'umaxtostr.c']

Since we just called combine_lines, we should only have to match until
the end of the line starting with 'lib_SOURCES'. Assuming I am
interpreting this comment correctly:

    # Extract the value of unconditional "lib_SOURCES += ..." augmentations.

and the sed invocation in gnulib-tool.sh line 3447:

   sed -n -e 's,^lib_SOURCES[    ]*+=\([^#]*\).*$,\1,p'

Collin

0001-gnulib-tool.py-Make-regular-expression-more-strict.patch
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