load config from file

7 files changed, 251 insertions, 101 deletions

diff --git a/bsie/apps/_loader.py b/bsie/apps/_loader.py
new file mode 100644
index 0000000..e02bed5
--- /dev/null
+++ b/bsie/apps/_loader.py
@@ -0,0 +1,52 @@
+"""
+
+Part of the bsie module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# standard imports
+import typing
+
+# external imports
+import yaml
+
+# bsie imports
+from bsie.extractor import ExtractorBuilder
+from bsie.lib import PipelineBuilder
+from bsie.lib.pipeline import Pipeline
+from bsie.reader import ReaderBuilder
+
+# constants
+DEFAULT_CONFIG_FILE = 'default_config.yaml'
+
+# exports
+__all__: typing.Sequence[str] = (
+    'load',
+    'DEFAULT_CONFIG_FILE',
+    )
+
+
+## code ##
+
+def load_pipeline(path: str) -> Pipeline:
+    """Load a pipeline according to a config at *path*."""
+    # load config file
+    with open(path, 'rt') as ifile:
+        cfg = yaml.safe_load(ifile)
+
+    # reader builder
+    rbuild = ReaderBuilder(cfg['ReaderBuilder'])
+    # extractor builder
+    ebuild = ExtractorBuilder(cfg['ExtractorBuilder'])
+    # pipeline builder
+    pbuild = PipelineBuilder(
+        rbuild,
+        ebuild,
+        )
+    # build pipeline
+    pipeline = pbuild.build()
+
+    # return pipeline
+    return pipeline
+
+## EOF ##
diff --git a/bsie/apps/default_config.yaml b/bsie/apps/default_config.yaml
new file mode 100644
index 0000000..4d99e22
--- /dev/null
+++ b/bsie/apps/default_config.yaml
@@ -0,0 +1,17 @@
+
+ReaderBuilder: {}
+
+ExtractorBuilder:
+
+  - bsie.extractor.preview.Preview:
+      max_sides: [50, 100, 200,400]
+
+  - bsie.extractor.generic.path.Path: {}
+
+  - bsie.extractor.generic.stat.Stat: {}
+
+  - bsie.extractor.image.colors_spatial.ColorsSpatial:
+      width: 2
+      height: 2
+      exp: 2
+
diff --git a/bsie/apps/index.py b/bsie/apps/index.py
index 8798c49..2d147c9 100644
--- a/bsie/apps/index.py
+++ b/bsie/apps/index.py
@@ -10,11 +10,12 @@ import os
 import typing
 
 # bsie imports
-from bsie.extractor import ExtractorBuilder
-from bsie.lib import BSIE, PipelineBuilder, DefaultNamingPolicy
-from bsie.reader import ReaderBuilder
+from bsie.lib import BSIE, DefaultNamingPolicy
 from bsie.utils import bsfs, errors, node as node_
 
+# inner-module imports
+from . import _loader
+
 # exports
 __all__: typing.Sequence[str] = (
     'main',
@@ -26,6 +27,9 @@ __all__: typing.Sequence[str] = (
 def main(argv):
     """Index files or directories into BSFS."""
     parser = argparse.ArgumentParser(description=main.__doc__, prog='index')
+    parser.add_argument('--config', type=str,
+        default=os.path.join(os.path.dirname(__file__), _loader.DEFAULT_CONFIG_FILE),
+        help='Path to the config file.')
     parser.add_argument('--host', type=bsfs.URI, default=bsfs.URI('http://example.com'),
         help='')
     parser.add_argument('--user', type=str, default='me',
@@ -44,39 +48,8 @@ def main(argv):
         help='')
     args = parser.parse_args(argv)
 
-    # FIXME: Read reader/extractor configs from a config file
-    # reader builder
-    rbuild = ReaderBuilder()
-    # extractor builder
-    ebuild = ExtractorBuilder([
-        {'bsie.extractor.preview.Preview': {
-            'max_sides': [50],
-            }},
-        {'bsie.extractor.generic.path.Path': {}},
-        {'bsie.extractor.generic.stat.Stat': {}},
-        {'bsie.extractor.generic.constant.Constant': dict(
-            tuples=[('http://bsfs.ai/schema/Entity#author', 'Me, myself, and I')],
-            schema='''
-                bse:author rdfs:subClassOf bsfs:Predicate ;
-                    rdfs:domain bsfs:Entity ;
-                    rdfs:range xsd:string ;
-                    bsfs:unique "true"^^xsd:boolean .
-                ''',
-            )},
-        {'bsie.extractor.image.colors_spatial.ColorsSpatial': {
-            'width': 2,
-            'height': 2,
-            'exp': 2,
-            }},
-        ])
-    # pipeline builder
-    pbuild = PipelineBuilder(
-        rbuild,
-        ebuild,
-        )
-
     # build pipeline
-    pipeline = pbuild.build()
+    pipeline = _loader.load_pipeline(args.config)
     # build the naming policy
     naming_policy = DefaultNamingPolicy(
         host=args.host,
@@ -127,7 +100,6 @@ def main(argv):
     return store
 
 
-
 ## main ##
 
 if __name__ == '__main__':
diff --git a/bsie/apps/info.py b/bsie/apps/info.py
index 750aedc..363ab30 100644
--- a/bsie/apps/info.py
+++ b/bsie/apps/info.py
@@ -6,15 +6,16 @@ Author: Matthias Baumgartner, 2022
 """
 # standard imports
 import argparse
+import os
 import sys
 import typing
 
 # bsie imports
-from bsie.extractor import ExtractorBuilder
-from bsie.lib import PipelineBuilder
-from bsie.reader import ReaderBuilder
 from bsie.utils import bsfs, errors
 
+# inner-module imports
+from . import _loader
+
 # exports
 __all__: typing.Sequence[str] = (
     'main',
@@ -26,43 +27,15 @@ __all__: typing.Sequence[str] = (
 def main(argv):
     """Show information from BSIE."""
     parser = argparse.ArgumentParser(description=main.__doc__, prog='info')
+    parser.add_argument('--config', type=str,
+        default=os.path.join(os.path.dirname(__file__), _loader.DEFAULT_CONFIG_FILE),
+        help='Path to the config file.')
     parser.add_argument('what', choices=('predicates', 'schema'),
         help='Select what information to show.')
     args = parser.parse_args(argv)
 
-    # FIXME: Read reader/extractor configs from a config file
-    # reader builder
-    rbuild = ReaderBuilder()
-    # extractor builder
-    ebuild = ExtractorBuilder([
-        {'bsie.extractor.preview.Preview': {
-            'max_sides': [50, 200],
-            }},
-        {'bsie.extractor.generic.path.Path': {}},
-        {'bsie.extractor.generic.stat.Stat': {}},
-        {'bsie.extractor.generic.constant.Constant': dict(
-            tuples=[('http://bsfs.ai/schema/Entity#author', 'Me, myself, and I')],
-            schema='''
-                bse:author rdfs:subClassOf bsfs:Predicate ;
-                    rdfs:domain bsfs:Entity ;
-                    rdfs:range xsd:string ;
-                    bsfs:unique "true"^^xsd:boolean .
-                ''',
-            )},
-        {'bsie.extractor.image.colors_spatial.ColorsSpatial': {
-            'width': 2,
-            'height': 2,
-            'exp': 2,
-            }},
-        ])
-    # pipeline builder
-    pbuild = PipelineBuilder(
-        rbuild,
-        ebuild,
-        )
-
     # build pipeline
-    pipeline = pbuild.build()
+    pipeline = _loader.load_pipeline(args.config)
 
     # show info
     if args.what == 'predicates':
diff --git a/test/apps/test_index.py b/test/apps/test_index.py
index d1e7140..a877684 100644
--- a/test/apps/test_index.py
+++ b/test/apps/test_index.py
@@ -8,10 +8,12 @@ Author: Matthias Baumgartner, 2022
 import contextlib
 import io
 import os
+import tempfile
 import unittest
 
 # external imports
 import rdflib
+import yaml
 
 # bsie imports
 from bsie.utils import ns
@@ -23,17 +25,52 @@ from bsie.apps.index import main
 ## code ##
 
 class TestIndex(unittest.TestCase):
+    def setUp(self):
+        config = {
+            'ReaderBuilder': {},
+            'ExtractorBuilder': [
+                {'bsie.extractor.preview.Preview': {
+                    'max_sides': [50],
+                    }},
+                {'bsie.extractor.generic.path.Path': {}},
+                {'bsie.extractor.generic.constant.Constant': {
+                    'schema': '''
+                        bse:author rdfs:subClassOf bsfs:Predicate ;
+                            rdfs:domain bsfs:Entity ;
+                            rdfs:range xsd:string ;
+                            bsfs:unique "true"^^xsd:boolean .
+                        ''',
+                    'tuples': [['http://bsfs.ai/schema/Entity#author', 'Me, myself, and I']],
+                  }},
+                {'bsie.extractor.image.colors_spatial.ColorsSpatial': {
+                    'width': 2,
+                    'height': 2,
+                    'exp': 2,
+                    }},
+                ]
+            }
+        # create config file
+        _, self.config_path = tempfile.mkstemp(prefix='bsie-test-', suffix='.yaml')
+        with open(self.config_path, 'wt') as cfile:
+            yaml.dump(config, cfile)
+
+    def tearDown(self):
+        if os.path.exists(self.config_path):
+            os.unlink(self.config_path)
+
     def test_disclaimer(self):
         print('Please wait, this test will take about 25 seconds')
 
     def test_main_invalid(self):
         outbuf = io.StringIO()
         with contextlib.redirect_stdout(outbuf):
-            bsfs = main([os.path.join(os.path.dirname(__file__), 'inexistent-file.t')])
+            bsfs = main(['--config', self.config_path, os.path.join(os.path.dirname(__file__), 'inexistent-file.t')])
         self.assertEqual(outbuf.getvalue().strip(), '')
 
     def test_main(self):
         bsfs = main([
+            '--config',
+            self.config_path,
             '-r',
             '--host', 'http://example.com',
             '--user', 'me',
@@ -48,57 +85,44 @@ class TestIndex(unittest.TestCase):
             (rdflib.URIRef(pre_file + '2f4109b40107cc50e0884755a1a961ed126887e49b8dbaf0e146b2e226aa6647'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + '2f4109b40107cc50e0884755a1a961ed126887e49b8dbaf0e146b2e226aa6647'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + '2f4109b40107cc50e0884755a1a961ed126887e49b8dbaf0e146b2e226aa6647'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('alpha_second', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + '2f4109b40107cc50e0884755a1a961ed126887e49b8dbaf0e146b2e226aa6647'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('696', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + '441f3d10c8ff489fe8e33e639606512f6c463151cc429de7e554b9af670c2ece'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + '441f3d10c8ff489fe8e33e639606512f6c463151cc429de7e554b9af670c2ece'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + '441f3d10c8ff489fe8e33e639606512f6c463151cc429de7e554b9af670c2ece'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('omega_second', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + '441f3d10c8ff489fe8e33e639606512f6c463151cc429de7e554b9af670c2ece'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('503', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + '69b98ecf7aff3e95b09688ba93331678eb8397817111f674c9558e6dd8f5e871'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + '69b98ecf7aff3e95b09688ba93331678eb8397817111f674c9558e6dd8f5e871'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + '69b98ecf7aff3e95b09688ba93331678eb8397817111f674c9558e6dd8f5e871'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('td_first', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + '69b98ecf7aff3e95b09688ba93331678eb8397817111f674c9558e6dd8f5e871'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('911', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + '78f7eb7f0d8221cdb2cb26c978fa42a11f75eb87becc768f4474134cb1e06926'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + '78f7eb7f0d8221cdb2cb26c978fa42a11f75eb87becc768f4474134cb1e06926'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + '78f7eb7f0d8221cdb2cb26c978fa42a11f75eb87becc768f4474134cb1e06926'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('testfile', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + '78f7eb7f0d8221cdb2cb26c978fa42a11f75eb87becc768f4474134cb1e06926'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('885', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + '80818b8ec2ee1919116dba9c8a7e0a4608313cf3b463cd88e9ed77a700dd92d3'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + '80818b8ec2ee1919116dba9c8a7e0a4608313cf3b463cd88e9ed77a700dd92d3'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + '80818b8ec2ee1919116dba9c8a7e0a4608313cf3b463cd88e9ed77a700dd92d3'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('bar_first', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + '80818b8ec2ee1919116dba9c8a7e0a4608313cf3b463cd88e9ed77a700dd92d3'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('956', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + '976d2ea0e58488678cc7e435fbfadabfb6eb6cf50ad51862f38f73729ed11795'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + '976d2ea0e58488678cc7e435fbfadabfb6eb6cf50ad51862f38f73729ed11795'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + '976d2ea0e58488678cc7e435fbfadabfb6eb6cf50ad51862f38f73729ed11795'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('omega_first', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + '976d2ea0e58488678cc7e435fbfadabfb6eb6cf50ad51862f38f73729ed11795'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('648', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + '997e2fbb7494a3818ec782d2bc87bf1cffafba6b9c0f658e4a6c18a723e944d3'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + '997e2fbb7494a3818ec782d2bc87bf1cffafba6b9c0f658e4a6c18a723e944d3'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + '997e2fbb7494a3818ec782d2bc87bf1cffafba6b9c0f658e4a6c18a723e944d3'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('alpha_first', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + '997e2fbb7494a3818ec782d2bc87bf1cffafba6b9c0f658e4a6c18a723e944d3'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('754', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + 'a8af899ecdab60dfaea8ec7f934053624c80a1054539e163f2c7eaa986c2777d'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + 'a8af899ecdab60dfaea8ec7f934053624c80a1054539e163f2c7eaa986c2777d'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + 'a8af899ecdab60dfaea8ec7f934053624c80a1054539e163f2c7eaa986c2777d'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('foo_second', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + 'a8af899ecdab60dfaea8ec7f934053624c80a1054539e163f2c7eaa986c2777d'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('585', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + 'b8fd7fba818254166a6043195004138ebda6923e012442f819a2c49671136c70'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + 'b8fd7fba818254166a6043195004138ebda6923e012442f819a2c49671136c70'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + 'b8fd7fba818254166a6043195004138ebda6923e012442f819a2c49671136c70'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('bar_second', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + 'b8fd7fba818254166a6043195004138ebda6923e012442f819a2c49671136c70'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('636', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + 'd43758ace82154a1cc10ca0dfef63cb20dd831f9c87edd6dc06539eefe67371d'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + 'd43758ace82154a1cc10ca0dfef63cb20dd831f9c87edd6dc06539eefe67371d'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + 'd43758ace82154a1cc10ca0dfef63cb20dd831f9c87edd6dc06539eefe67371d'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('foo_first', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + 'd43758ace82154a1cc10ca0dfef63cb20dd831f9c87edd6dc06539eefe67371d'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('546', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + 'd803187cbf3676ae9d38126270a6152c60431589aa3bb3824baf8954e9c097f1'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + 'd803187cbf3676ae9d38126270a6152c60431589aa3bb3824baf8954e9c097f1'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + 'd803187cbf3676ae9d38126270a6152c60431589aa3bb3824baf8954e9c097f1'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('td_second', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + 'd803187cbf3676ae9d38126270a6152c60431589aa3bb3824baf8954e9c097f1'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('703', datatype=rdflib.XSD.integer)),
             (rdflib.URIRef(pre_file + 'accb115d266ad60c53cd01a7f7130f245886ce8eaf69bc85319febc11d9fe089'), rdflib.RDF.type, rdflib.URIRef(ns.bsfs.File)),
             (rdflib.URIRef(pre_file + 'accb115d266ad60c53cd01a7f7130f245886ce8eaf69bc85319febc11d9fe089'), rdflib.URIRef(ns.bse.author), rdflib.Literal('Me, myself, and I', datatype=rdflib.XSD.string)),
             (rdflib.URIRef(pre_file + 'accb115d266ad60c53cd01a7f7130f245886ce8eaf69bc85319febc11d9fe089'), rdflib.URIRef(ns.bse.filename), rdflib.Literal('testimage.jpg', datatype=rdflib.XSD.string)),
-            (rdflib.URIRef(pre_file + 'accb115d266ad60c53cd01a7f7130f245886ce8eaf69bc85319febc11d9fe089'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('349264', datatype=rdflib.XSD.integer)),
             # features
             (rdflib.URIRef(pre_file + 'accb115d266ad60c53cd01a7f7130f245886ce8eaf69bc85319febc11d9fe089'), rdflib.URIRef('http://bsfs.ai/schema/Entity/colors_spatial#0658f2234a054e1dd59a14462c89f7733e019160419c796356aa831498bd0a04'),
                 rdflib.Literal(
                     '(91, 127, 121, 94, 138, 167, 163, 134, 190, 138, 170, 156, 121, 142, 159)',
                     datatype=rdflib.URIRef('http://ie.bsfs.ai/schema/Feature/ColorsSpatial#0658f2234a054e1dd59a14462c89f7733e019160419c796356aa831498bd0a04'))),
-            (rdflib.URIRef(pre_file + 'accb115d266ad60c53cd01a7f7130f245886ce8eaf69bc85319febc11d9fe089'), rdflib.URIRef(ns.bse.filesize), rdflib.Literal('349264', datatype=rdflib.XSD.integer)),
             # links to previews
             (rdflib.URIRef(pre_file + '2f4109b40107cc50e0884755a1a961ed126887e49b8dbaf0e146b2e226aa6647'), rdflib.URIRef(ns.bse.preview), rdflib.URIRef(pre_preview + '79cb8a7e6369361a4f4cb7ff729c1ed3fcf87204769623d6fbd6ebfae601e5c7_s50')),
             (rdflib.URIRef(pre_file + '441f3d10c8ff489fe8e33e639606512f6c463151cc429de7e554b9af670c2ece'), rdflib.URIRef(ns.bse.preview), rdflib.URIRef(pre_preview + 'a8b3245636074d5370283b690281abda8ffdff12ce8b1af77c8bc0a4c85be860_s50')),
@@ -211,38 +235,26 @@ class TestIndex(unittest.TestCase):
         self.assertTrue((set(outbuf.getvalue().split('\n')) - {''}).issuperset({
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#2f4109b40107cc50e0884755a1a961ed126887e49b8dbaf0e146b2e226aa6647) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#2f4109b40107cc50e0884755a1a961ed126887e49b8dbaf0e146b2e226aa6647) Predicate({ns.bse.filename}) alpha_second',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#2f4109b40107cc50e0884755a1a961ed126887e49b8dbaf0e146b2e226aa6647) Predicate({ns.bse.filesize}) 696',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#441f3d10c8ff489fe8e33e639606512f6c463151cc429de7e554b9af670c2ece) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#441f3d10c8ff489fe8e33e639606512f6c463151cc429de7e554b9af670c2ece) Predicate({ns.bse.filename}) omega_second',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#441f3d10c8ff489fe8e33e639606512f6c463151cc429de7e554b9af670c2ece) Predicate({ns.bse.filesize}) 503',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#69b98ecf7aff3e95b09688ba93331678eb8397817111f674c9558e6dd8f5e871) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#69b98ecf7aff3e95b09688ba93331678eb8397817111f674c9558e6dd8f5e871) Predicate({ns.bse.filename}) td_first',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#69b98ecf7aff3e95b09688ba93331678eb8397817111f674c9558e6dd8f5e871) Predicate({ns.bse.filesize}) 911',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#78f7eb7f0d8221cdb2cb26c978fa42a11f75eb87becc768f4474134cb1e06926) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#78f7eb7f0d8221cdb2cb26c978fa42a11f75eb87becc768f4474134cb1e06926) Predicate({ns.bse.filename}) testfile',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#78f7eb7f0d8221cdb2cb26c978fa42a11f75eb87becc768f4474134cb1e06926) Predicate({ns.bse.filesize}) 885',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#80818b8ec2ee1919116dba9c8a7e0a4608313cf3b463cd88e9ed77a700dd92d3) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#80818b8ec2ee1919116dba9c8a7e0a4608313cf3b463cd88e9ed77a700dd92d3) Predicate({ns.bse.filename}) bar_first',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#80818b8ec2ee1919116dba9c8a7e0a4608313cf3b463cd88e9ed77a700dd92d3) Predicate({ns.bse.filesize}) 956',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#976d2ea0e58488678cc7e435fbfadabfb6eb6cf50ad51862f38f73729ed11795) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#976d2ea0e58488678cc7e435fbfadabfb6eb6cf50ad51862f38f73729ed11795) Predicate({ns.bse.filename}) omega_first',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#976d2ea0e58488678cc7e435fbfadabfb6eb6cf50ad51862f38f73729ed11795) Predicate({ns.bse.filesize}) 648',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#997e2fbb7494a3818ec782d2bc87bf1cffafba6b9c0f658e4a6c18a723e944d3) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#997e2fbb7494a3818ec782d2bc87bf1cffafba6b9c0f658e4a6c18a723e944d3) Predicate({ns.bse.filename}) alpha_first',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#997e2fbb7494a3818ec782d2bc87bf1cffafba6b9c0f658e4a6c18a723e944d3) Predicate({ns.bse.filesize}) 754',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#a8af899ecdab60dfaea8ec7f934053624c80a1054539e163f2c7eaa986c2777d) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#a8af899ecdab60dfaea8ec7f934053624c80a1054539e163f2c7eaa986c2777d) Predicate({ns.bse.filename}) foo_second',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#a8af899ecdab60dfaea8ec7f934053624c80a1054539e163f2c7eaa986c2777d) Predicate({ns.bse.filesize}) 585',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#b8fd7fba818254166a6043195004138ebda6923e012442f819a2c49671136c70) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#b8fd7fba818254166a6043195004138ebda6923e012442f819a2c49671136c70) Predicate({ns.bse.filename}) bar_second',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#b8fd7fba818254166a6043195004138ebda6923e012442f819a2c49671136c70) Predicate({ns.bse.filesize}) 636',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#d43758ace82154a1cc10ca0dfef63cb20dd831f9c87edd6dc06539eefe67371d) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#d43758ace82154a1cc10ca0dfef63cb20dd831f9c87edd6dc06539eefe67371d) Predicate({ns.bse.filename}) foo_first',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#d43758ace82154a1cc10ca0dfef63cb20dd831f9c87edd6dc06539eefe67371d) Predicate({ns.bse.filesize}) 546',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#d803187cbf3676ae9d38126270a6152c60431589aa3bb3824baf8954e9c097f1) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#d803187cbf3676ae9d38126270a6152c60431589aa3bb3824baf8954e9c097f1) Predicate({ns.bse.filename}) td_second',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#d803187cbf3676ae9d38126270a6152c60431589aa3bb3824baf8954e9c097f1) Predicate({ns.bse.filesize}) 703',
-            f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#accb115d266ad60c53cd01a7f7130f245886ce8eaf69bc85319febc11d9fe089) Predicate({ns.bse.filesize}) 349264',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#accb115d266ad60c53cd01a7f7130f245886ce8eaf69bc85319febc11d9fe089) Predicate({ns.bse.author}) Me, myself, and I',
             f'Node(http://bsfs.ai/schema/File, http://example.com/me/file#accb115d266ad60c53cd01a7f7130f245886ce8eaf69bc85319febc11d9fe089) Predicate({ns.bse.filename}) testimage.jpg',
             # features
diff --git a/test/apps/test_info.py b/test/apps/test_info.py
index 725fb65..cf8d52f 100644
--- a/test/apps/test_info.py
+++ b/test/apps/test_info.py
@@ -8,8 +8,13 @@ Author: Matthias Baumgartner, 2022
 import argparse
 import contextlib
 import io
+import os
+import tempfile
 import unittest
 
+# external imports
+import yaml
+
 # bsie imports
 from bsie.utils import bsfs
 
@@ -20,17 +25,49 @@ from bsie.apps.info import main
 ## code ##
 
 class TestIndex(unittest.TestCase):
+    def setUp(self):
+        config = {
+            'ReaderBuilder': {},
+            'ExtractorBuilder': [
+                {'bsie.extractor.preview.Preview': {
+                    'max_sides': [50],
+                    }},
+                {'bsie.extractor.generic.path.Path': {}},
+                {'bsie.extractor.generic.constant.Constant': {
+                    'schema': '''
+                        bse:author rdfs:subClassOf bsfs:Predicate ;
+                            rdfs:domain bsfs:Entity ;
+                            rdfs:range xsd:string ;
+                            bsfs:unique "true"^^xsd:boolean .
+                        ''',
+                    'tuples': [['http://bsfs.ai/schema/Entity#author', 'Me, myself, and I']],
+                  }},
+                {'bsie.extractor.image.colors_spatial.ColorsSpatial': {
+                    'width': 2,
+                    'height': 2,
+                    'exp': 2,
+                    }},
+                ]
+            }
+        # create config file
+        _, self.config_path = tempfile.mkstemp(prefix='bsie-test-', suffix='.yaml')
+        with open(self.config_path, 'wt') as cfile:
+            yaml.dump(config, cfile)
+
+    def tearDown(self):
+        if os.path.exists(self.config_path):
+            os.unlink(self.config_path)
+
     def test_predicates(self):
         outbuf = io.StringIO()
         with contextlib.redirect_stdout(outbuf):
             # show predicates infos
-            main(['predicates'])
+            main(['--config', self.config_path, 'predicates'])
         # verify output
         self.assertSetEqual({pred for pred in outbuf.getvalue().split('\n') if pred != ''}, {
             'http://bsfs.ai/schema/Entity#author',
             'http://bsfs.ai/schema/Predicate',
             'http://bsfs.ai/schema/Entity#filename',
-            'http://bsfs.ai/schema/Entity#filesize',
             'http://bsfs.ai/schema/Entity/colors_spatial#0658f2234a054e1dd59a14462c89f7733e019160419c796356aa831498bd0a04',
             'http://bsfs.ai/schema/Entity#preview',
             'http://bsfs.ai/schema/Preview#width',
@@ -42,14 +79,13 @@ class TestIndex(unittest.TestCase):
         outbuf = io.StringIO()
         with contextlib.redirect_stdout(outbuf):
             # show schema infos
-            main(['schema'])
+            main(['--config', self.config_path, 'schema'])
         # verify output
         schema = bsfs.schema.from_string(outbuf.getvalue())
         self.assertSetEqual({pred.uri for pred in schema.predicates()}, {
             'http://bsfs.ai/schema/Entity#author',
             'http://bsfs.ai/schema/Predicate',
             'http://bsfs.ai/schema/Entity#filename',
-            'http://bsfs.ai/schema/Entity#filesize',
             'http://bsfs.ai/schema/Entity/colors_spatial#0658f2234a054e1dd59a14462c89f7733e019160419c796356aa831498bd0a04',
             'http://bsfs.ai/schema/Entity#preview',
             'http://bsfs.ai/schema/Preview#width',
diff --git a/test/apps/test_loader.py b/test/apps/test_loader.py
new file mode 100644
index 0000000..09a9162
--- /dev/null
+++ b/test/apps/test_loader.py
@@ -0,0 +1,88 @@
+"""
+
+Part of the bsie test suite.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# standard imports
+import os
+import tempfile
+import unittest
+
+# external imports
+import yaml
+
+# objects to test
+from bsie.apps._loader import load_pipeline
+
+
+## code ##
+
+class TestLoader(unittest.TestCase):
+    def test_load_pipeline(self):
+        # config file can be empty
+        config = {
+            'ReaderBuilder': {},
+            'ExtractorBuilder': []
+            }
+        # create config file
+        _, path = tempfile.mkstemp(prefix='bsie-test-', suffix='.yaml')
+        with open(path, 'wt') as cfile:
+            yaml.dump(config, cfile)
+        # pipeline contains only default predicates
+        pipeline = load_pipeline(path)
+        self.assertSetEqual({pred.uri for pred in pipeline.schema.predicates()}, {
+            'http://bsfs.ai/schema/Predicate',
+            })
+
+        # pipeline is built according to configured extractors
+        config = {
+            'ReaderBuilder': {},
+            'ExtractorBuilder': [
+                {'bsie.extractor.preview.Preview': {
+                    'max_sides': [50],
+                    }},
+                {'bsie.extractor.generic.path.Path': {}},
+                {'bsie.extractor.generic.constant.Constant': {
+                    'schema': '''
+                        bse:author rdfs:subClassOf bsfs:Predicate ;
+                            rdfs:domain bsfs:Entity ;
+                            rdfs:range xsd:string ;
+                            bsfs:unique "true"^^xsd:boolean .
+                        ''',
+                    'tuples': [['http://bsfs.ai/schema/Entity#author', 'Me, myself, and I']],
+                  }},
+                {'bsie.extractor.image.colors_spatial.ColorsSpatial': {
+                    'width': 2,
+                    'height': 2,
+                    'exp': 2,
+                    }},
+                ]
+            }
+        # create config file
+        _, path = tempfile.mkstemp(prefix='bsie-test-', suffix='.yaml')
+        with open(path, 'wt') as cfile:
+            yaml.dump(config, cfile)
+        # pipeline contains all defined predicates
+        pipeline = load_pipeline(path)
+        self.assertSetEqual({pred.uri for pred in pipeline.schema.predicates()}, {
+            'http://bsfs.ai/schema/Entity#author',
+            'http://bsfs.ai/schema/Predicate',
+            'http://bsfs.ai/schema/Entity#filename',
+            'http://bsfs.ai/schema/Entity/colors_spatial#0658f2234a054e1dd59a14462c89f7733e019160419c796356aa831498bd0a04',
+            'http://bsfs.ai/schema/Entity#preview',
+            'http://bsfs.ai/schema/Preview#width',
+            'http://bsfs.ai/schema/Preview#height',
+            'http://bsfs.ai/schema/Preview#asset',
+            })
+
+        # config file must exist
+        self.assertRaises(OSError, load_pipeline, 'invalid.yaml')
+
+
+## main ##
+
+if __name__ == '__main__':
+    unittest.main()
+
+## EOF ##