bitbake: BBHandler: Check tab indentation for python code

The previous check was in data.py which only can check code like "python
funcname()" in the dependency chain, but there are 3 kinds of python functions:
  - python()
  - def py_funcname()
  - python funcname()

Add the checking to BBHandler to check and warn for all of them.

The warning looks like:
WARNING: /path/to/recipes-core/busybox/busybox_1.29.2.bb: python should use 4 spaces indentation, but found tabs in busybox.inc, line 75

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 11 insertions, 2 deletions

diff --git a/lib/bb/data.py b/lib/bb/data.py
index d66d98cc8..6bcfcf46c 100644
--- a/lib/bb/data.py
+++ b/lib/bb/data.py
@@ -322,8 +322,6 @@ def build_dependencies(key, keys, shelldeps, varflagsexcl, d):
             if varflags.get("python"):
                 value = d.getVarFlag(key, "_content", False)
                 parser = bb.codeparser.PythonParser(key, logger)
-                if value and "\t" in value:
-                    logger.warning("Variable %s contains tabs, please remove these (%s)" % (key, d.getVar("FILE")))
                 parser.parse_python(value, filename=varflags.get("filename"), lineno=varflags.get("lineno"))
                 deps = deps | parser.references
                 deps = deps | (keys & parser.execs)
diff --git a/lib/bb/parse/parse_py/BBHandler.py b/lib/bb/parse/parse_py/BBHandler.py
index 01fc47e51..f3bf4aa52 100644
--- a/lib/bb/parse/parse_py/BBHandler.py
+++ b/lib/bb/parse/parse_py/BBHandler.py
@@ -46,6 +46,7 @@ __deltask_regexp__       = re.compile("deltask\s+(?P<func>\w+)")
 __addhandler_regexp__    = re.compile( r"addhandler\s+(.+)" )
 __def_regexp__           = re.compile( r"def\s+(\w+).*:" )
 __python_func_regexp__   = re.compile( r"(\s+.*)|(^$)|(^#)" )
+__python_tab_regexp__    = re.compile(" *\t")
 
 __infunc__ = []
 __inpython__ = False
@@ -160,6 +161,16 @@ def handle(fn, d, include):
 
 def feeder(lineno, s, fn, root, statements, eof=False):
     global __func_start_regexp__, __inherit_regexp__, __export_func_regexp__, __addtask_regexp__, __addhandler_regexp__, __def_regexp__, __python_func_regexp__, __inpython__, __infunc__, __body__, bb, __residue__, __classname__
+
+    # Check tabs in python functions:
+    # - def py_funcname(): covered by __inpython__
+    # - python(): covered by '__anonymous' == __infunc__[0]
+    # - python funcname(): covered by __infunc__[3]
+    if __inpython__ or (__infunc__ and ('__anonymous' == __infunc__[0] or __infunc__[3])):
+        tab = __python_tab_regexp__.match(s)
+        if tab:
+            bb.warn('python should use 4 spaces indentation, but found tabs in %s, line %s' % (root, lineno))
+
     if __infunc__:
         if s == '}':
             __body__.append('')