Refactor scan resources to account for base_paths

tools/toolchains/__init__.py

@@ -507,11 +507,26 @@ def need_update(self, target, dependencies):
         return False
 
     def is_ignored(self, file_path):
+        """Check if file path is ignored by any .mbedignore thus far"""
         for pattern in self.ignore_patterns:
             if fnmatch.fnmatch(file_path, pattern):
                 return True
         return False
 
+    def add_ignore_patterns(self, root, base_path, patterns):
+        """Add a series of patterns to the ignored paths
+
+        Positional arguments:
+        root - the directory containing the ignore file
+        base_path - the location that the scan started from
+        patterns - the list of patterns we will ignore in the future
+        """
+        real_base = relpath(root, base_path)
+        if real_base == ".":
+            self.ignore_patterns.extend(patterns)
+        else:
+            self.ignore_patterns.extend(join(real_base, pat) for pat in patterns)
+
     # Create a Resources object from the path pointed to by *path* by either traversing a
     # a directory structure, when *path* is a directory, or adding *path* to the resources,
     # when *path* is a file.
@@ -559,10 +574,11 @@ def _add_dir(self, path, resources, base_path, exclude_paths=None):
                     lines = [l for l in lines if l != ""] # Strip empty lines
                     lines = [l for l in lines if not re.match("^#",l)] # Strip comment lines
                     # Append root path to glob patterns and append patterns to ignore_patterns
-                    self.ignore_patterns.extend([join(root,line.strip()) for line in lines])
+                    self.add_ignore_patterns(root, base_path, lines)
 
             # Skip the whole folder if ignored, e.g. .mbedignore containing '*'
-            if self.is_ignored(join(root,"")):
+            if self.is_ignored(join(relpath(root, base_path),"")):
+                dirs[:] = []
                 continue
 
             for d in copy(dirs):
@@ -577,7 +593,7 @@ def _add_dir(self, path, resources, base_path, exclude_paths=None):
                     # Ignore toolchain that do not match the current TOOLCHAIN
                     (d.startswith('TOOLCHAIN_') and d[10:] not in labels['TOOLCHAIN']) or
                     # Ignore .mbedignore files
-                    self.is_ignored(join(dir_path,"")) or
+                    self.is_ignored(join(relpath(root, base_path), d,"")) or
                     # Ignore TESTS dir
                     (d == 'TESTS')):
                         dirs.remove(d)
@@ -606,7 +622,7 @@ def _add_dir(self, path, resources, base_path, exclude_paths=None):
     def _add_file(self, file_path, resources, base_path, exclude_paths=None):
         resources.file_basepath[file_path] = base_path
 
-        if self.is_ignored(file_path):
+        if self.is_ignored(relpath(file_path, base_path)):
             return
 
         _, ext = splitext(file_path)