recipetool: create: add basic support for new npm fetcher/class

Add detection for npm modules and support for extracting the name and
version from package.json as is usually part of an npm module contents.

Note: this will likely only produce a buildable recipe if you use an
npm:// URL; simply pointing to a node.js source repository isn't going
to fetch the module's dependencies. It also doesn't set up the
shrinkwrap/lockdown automatically, so there is some room for improvement
later.

Implements [YOCTO #8690].

(From OE-Core rev: 41d0e4d75f13b53a6c1b6a8df9be4742be7534e0)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/recipetool/create_npm.py

@@ -0,0 +1,48 @@
+# Recipe creation tool - node.js NPM module support plugin
+#
+# Copyright (C) 2016 Intel Corporation
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+import logging
+import json
+from recipetool.create import RecipeHandler
+
+logger = logging.getLogger('recipetool')
+
+
+class NpmRecipeHandler(RecipeHandler):
+    def process(self, srctree, classes, lines_before, lines_after, handled, extravalues):
+        if 'buildsystem' in handled:
+            return False
+
+        files = RecipeHandler.checkfiles(srctree, ['package.json'])
+        if files:
+            with open(files[0], 'r') as f:
+                data = json.loads(f.read())
+            if 'name' in data and 'version' in data:
+                extravalues['PN'] = data['name']
+                extravalues['PV'] = data['version']
+                classes.append('npm')
+                handled.append('buildsystem')
+                if 'description' in data:
+                    lines_before.append('SUMMARY = "%s"' % data['description'])
+                if 'homepage' in data:
+                    lines_before.append('HOMEPAGE = "%s"' % data['homepage'])
+                return True
+
+        return False
+
+def register_recipe_handlers(handlers):
+    handlers.append((NpmRecipeHandler(), 60))