recipetool: create: split npm module dependencies into packages

Rather than rolling all of an npm module's dependencies into the same
package, split them into one module per package, setting the SUMMARY and
PKGV values from the package.json file for each package. Additionally,
mark each package with the appropriate license using the license
scanning we already do, falling back to the license stated in the
package.json file for the module if unknown. All of this is mostly in
aid of ensuring all modules and their licenses now show up in the
manifests for the image.

Additionally we set the main LICENSE value more concretely once we've
calculated the per-package licenses, since we have more information at
that point.

(From OE-Core rev: 8226805f83d21e7c1d2ba21969f3e8ee4b137496)

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

meta/lib/oe/package.py

@@ -123,3 +123,35 @@ def read_shlib_providers(d):
                         shlib_provider[s[0]] = {}
                     shlib_provider[s[0]][s[1]] = (dep_pkg, s[2])
     return shlib_provider
+
+
+def npm_split_package_dirs(pkgdir):
+    """
+    Work out the packages fetched and unpacked by BitBake's npm fetcher
+    Returns a dict of packagename -> (relpath, package.json) ordered
+    such that it is suitable for use in PACKAGES and FILES
+    """
+    from collections import OrderedDict
+    import json
+    packages = {}
+    for root, dirs, files in os.walk(pkgdir):
+        if os.path.basename(root) == 'node_modules':
+            for dn in dirs:
+                relpth = os.path.relpath(os.path.join(root, dn), pkgdir)
+                pkgitems = ['${PN}']
+                for pathitem in relpth.split('/'):
+                    if pathitem == 'node_modules':
+                        continue
+                    pkgitems.append(pathitem)
+                pkgname = '-'.join(pkgitems)
+                pkgfile = os.path.join(root, dn, 'package.json')
+                data = None
+                if os.path.exists(pkgfile):
+                    with open(pkgfile, 'r') as f:
+                        data = json.loads(f.read())
+                packages[pkgname] = (relpth, data)
+    # We want the main package for a module sorted *after* its subpackages
+    # (so that it doesn't otherwise steal the files for the subpackage), so
+    # this is a cheap way to do that whilst still having an otherwise
+    # alphabetical sort
+    return OrderedDict((key, packages[key]) for key in sorted(packages, key=lambda pkg: pkg + '~'))