Fix up file-matching in bashate tox test

The current test does not match file files in /lib/* because the
-wholename command is missing the preceeding \*.  The whole command is
a little difficult to understand.

This re-lays the find command, using -prune to skip dot directories
and keeping a hopefully clearer flow of what is being matched.

Change-Id: Idd856e897ff97095fb116294a9187ff4b198fa26

tox.ini

@@ -10,7 +10,19 @@ install_command = pip install {opts} {packages}
 [testenv:bashate]
 deps = bashate
 whitelist_externals = bash
-commands = bash -c "find {toxinidir} -not -wholename \*.tox/\* -and \( -name \*.sh -or -name \*rc -or -name functions\* -or \( -wholename lib/\* -and -not -name \*.md \) \) -print0 | xargs -0 bashate -v"
+commands = bash -c "find {toxinidir}          \
+         -not \( -type d -name .?\* -prune \) \ # prune all 'dot' dirs
+         -not \( -type d -name doc -prune \)  \ # skip documentation
+         -type f                              \ # only files
+         -not -name \*~                       \ # skip editors, readme, etc
+         -not -name \*.md                     \
+         \(                                   \
+          -name \*.sh -or                     \
+          -name \*rc -or                      \
+          -name functions\* -or               \
+          -wholename \*/lib/\*                \ # /lib files are shell, but
+         \)                                   \ #   have no extension
+         -print0 | xargs -0 bashate -v"
 
 [testenv:docs]
 deps =