Convert dep_dsl to full example

Test Plan: manual

Reviewers: schrockn

Differential Revision: https://dagster.phacility.com/D2970

.gitpod.Dockerfile

@@ -0,0 +1,9 @@
+FROM gitpod/workspace-full
+
+USER gitpod
+
+# Install wxPython dependencies
+RUN sudo apt-get -q update
+
+ENV DAGSTER_HOME="$HOME/dagster_home"
+RUN mkdir -p $DAGSTER_HOME

.gitpod.yml

@@ -0,0 +1,16 @@
+image:
+  file: .gitpod.Dockerfile
+
+# This will expose all necessary ports needed for your VNC image
+ports:
+  - port: 3000
+    onOpen: open-preview
+
+tasks:
+  - command: |
+      cd examples/dagster_examples/$EXAMPLE
+      pip3 install -r requirements.txt
+      [ -e README.md ] && gp open README.md
+      clear && dagit
+  - openMode: split-right
+    command: echo SplitTerminal && clear

examples/dagster_examples/dep_dsl/README.md

@@ -0,0 +1,54 @@
+---
+title: Dependency DSL
+description: How to create a custom DSL for defining pipelines
+---
+
+# Dependency DSL
+
+This demo example is to demonstrate that it is possible to construct
+the dependencies of a pipeline definition from a YAML file or similar.
+This is not the "blessed" file format nor is it our recommendation for
+doing things. However we've been asked a number of times if this is possible
+and this should serve as a reasonable template to build upon.
+
+For example:
+
+```YAML
+pipeline:
+  name: some_example
+  description: blah blah blah
+  solids:
+    - def: add_one
+      alias: A
+    - def: add_one
+      alias: B
+      deps:
+        num:
+          solid: A
+    - def: add_two
+      alias: C
+      deps:
+        num:
+          solid: A
+    - def: subtract
+      deps:
+        left:
+          solid: B
+        right:
+          solid: C
+```
+
+# Open in Playground
+
+Open up this example in a playground using [Gitpod](https://gitpod.io)
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#EXAMPLE=dep_dsl/https://github.com/dagster-io/dagster)
+
+# Download Manually
+
+Download the example:
+
+```
+curl https://codeload.github.com/dagster-io/dagster/tar.gz/master | tar -xz --strip=3 dagster-master/examples/dagster_examples/dep_dsl
+cd dep_dsl
+```

examples/dagster_examples/dep_dsl/pipeline.py → examples/dagster_examples/dep_dsl/repo.py

@@ -1,13 +1,7 @@
-'''
-This demo example is to demonstrate that it is possible to construct
-the dependencies of a pipeline definition from a yaml file or similar.
-This is not the "blessed" file format nor is it our recommendation for
-doing things. However we've been asked a number of times if this is possible
-and this should serve as a reasonable template to build upon.
-'''
 from dagster import (
     DependencyDefinition,
     PipelineDefinition,
+    RepositoryDefinition,
     SolidInvocation,
     check,
     file_relative_path,
@@ -60,3 +54,9 @@ def define_dep_dsl_pipeline():
     return construct_pipeline_with_yaml(
         file_relative_path(__file__, 'example.yaml'), [add_one, add_two, subtract]
     )
+
+
+def define_repository():
+    return RepositoryDefinition(
+        "my_repository", pipeline_dict={'dsl_pipeline': define_dep_dsl_pipeline}
+    )

examples/dagster_examples/dep_dsl/repository.yaml

@@ -0,0 +1,3 @@
+repository:
+  file: repo.py
+  fn: define_repository

examples/dagster_examples/dep_dsl/requirements.txt

@@ -0,0 +1,2 @@
+dagster
+dagit

examples/dagster_examples_tests/dep_dsl_tests/test_basic.py

@@ -1,4 +1,4 @@
-from dagster_examples.dep_dsl.pipeline import define_dep_dsl_pipeline
+from dagster_examples.dep_dsl.repo import define_dep_dsl_pipeline
 
 from dagster import execute_pipeline