add script to set copyright header for source files

this works for:
- C/C++ files
- files where comment is #

Change include set of simple tests.

Change-Id: I1c08c6c359e2a48957d5d81397c439508ae06c42
Signed-off-by: Artur Harasimiuk <artur.harasimiuk@intel.com>

scripts/lint/set_copyright.py

@@ -0,0 +1,201 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2018 Intel Corporation
+#
+# SPDX-License-Identifier: MIT
+#
+
+import re
+import sys
+import os.path
+from datetime import date
+from stat import ST_MODE
+
+# count arguments, need at least 1
+if len(sys.argv) < 2:
+    print "need 1 argument, file\n"
+    sys.exit(0)
+
+header_cpp = """/*
+ * Copyright (C) %s Intel Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+"""
+
+header_bash_style = """#
+# Copyright (C) %s Intel Corporation
+#
+# SPDX-License-Identifier: MIT
+#
+"""
+
+allowed_extensions = [
+    'cpp', 'h', 'inl', 'hpp', 'm',
+    'cmake',
+    'py', 'sh',
+    'cl',
+    'exports'
+]
+
+allowed_extensions_2 = [
+    'h.in',
+    'options.txt'
+]
+
+allowed_files = [
+    'CMakeLists.txt'
+]
+
+banned_paths = [
+    'scripts/tests/copyright/in',
+    'scripts/tests/copyright/out'
+]
+
+def isBanned(path):
+    path_ok = False
+    for banned_path in banned_paths:
+        if dirname.startswith(banned_path):
+            path_ok = True
+            break
+    return path_ok
+
+for path in sys.argv:
+
+    # avoid self scan
+    if os.path.abspath(path) == os.path.abspath(sys.argv[0]):
+        continue
+
+    # check whether we should scan this file
+    path_ext = path.split('.')
+    path_ok = False
+    filename = os.path.basename(path)
+    dirname = os.path.dirname(path)
+    while True:
+        if isBanned(path):
+            path_ok = False
+            break
+
+        if filename in allowed_files:
+            path_ok = True
+            break
+
+        if path_ext[-1].lower() in allowed_extensions:
+            path_ok = True
+            break
+
+        if '.'.join(path_ext[-2:]) in allowed_extensions_2:
+            path_ok = True
+            break
+        break
+
+    if not path_ok:
+        print "Ignoring file: %s" % path
+        continue
+
+    # check that first arg is a existing file
+    if not os.path.isfile(path):
+        print "cannot find file %s, skipping" % path
+        continue
+
+    print "Processing file: %s" % path
+
+    L = list()
+    start_year = None
+    header = header_cpp
+    header_start = '/*'
+    header_end = '*/'
+    comment_char = "\*"
+
+    # now read line by line
+    f = open(path, 'r')
+
+    # take care of hashbang
+    first_line = f.readline()
+    if not first_line.startswith( '#!' ):
+        line = first_line
+        first_line = ''
+    else:
+        line = f.readline()
+
+    # check whether comment type is '#'
+    if first_line or line.startswith('#'):
+        header_start = '#'
+        header_end = '\n'
+        header = header_bash_style
+        comment_char = "#"
+
+    curr_comment = list()
+
+    # copyright have to be first comment in file
+    if line.startswith(header_start):
+        isHeader = True
+        isHeaderEnd = False
+    else:
+        isHeader = False
+        isHeaderEnd = True
+
+    isCopyright = False
+
+    while (line):
+        if isHeader:
+            if header_end == '\n' and len(line.strip()) == 0:
+                isHeader = False
+                isHeaderEnd = True
+            elif line.strip().endswith(header_end):
+                isHeader = False
+                isHeaderEnd = True
+            elif "Copyright" in line:
+                tmp = line.split(',')
+                expr  = ("^%s Copyright \([Cc]\) (\d+)( *- *\d+)?" % comment_char)
+                m = re.match(expr, line.strip())
+                if not m is None:
+                    start_year = m.groups()[0]
+                    curr_comment = list()
+                    isCopyright = True
+            if not isCopyright:
+                curr_comment.append(line)
+        elif isCopyright and isHeaderEnd:
+            if len(line.strip()) > 0:
+                L.append(line)
+                isHeaderEnd = False
+        else:
+            L.append(line)
+
+        line = f.readline()
+
+    f.close()
+
+    year = date.today().year
+    if start_year is None:
+        start_year = str(year)
+    elif int(start_year) < year:
+        start_year += "-"
+        start_year += str(year)
+
+    # store file mode because we want to preserve this
+    old_mode = os.stat(path)[ST_MODE]
+
+    os.remove(path)
+    f = open(path, 'w')
+
+    if first_line:
+        f.write(first_line)
+
+    f.write(header % start_year)
+
+    if len(curr_comment)>0 or len(L)>0:
+        f.write("\n")
+
+    if len(curr_comment)>0:
+        f.write(''.join(curr_comment))
+
+    contents = ''.join(L)
+    f.write(contents)
+    f.close()
+
+    # chmod to original value
+    os.chmod(path, old_mode)
+
+    del L[:]