Fixes #77 Makes --keep-version-file work for Azure and Vanilla (#78)

* initial keep file version working, will do more tests

* Update .gitignore

* Get latest tests to work

* ChangeLog

.gitignore

@@ -302,4 +302,4 @@ package/
 *.tgz
 src/obj/
 *.log
-.pytest_cache
+.pytest_cache

ChangeLog.md

@@ -1,5 +1,8 @@
 # Change Log
 
+### 2019-05-21 - 4.0.70
+
+- Beta version of --keep-version-file for ARM generator
 
 ### 2019-02-13 - 4.0.67
 

src/azure/CodeGeneratorPya.cs

@@ -7,6 +7,7 @@ using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using AutoRest.Core.Model;
+using AutoRest.Core;
 using AutoRest.Extensions.Azure;
 using AutoRest.Python.Model;
 using AutoRest.Python.Azure.Model;
@@ -72,8 +73,18 @@ namespace AutoRest.Python.Azure
                 await Write(serviceClientTemplateOpAsync, Path.Combine(folderName, "aio", "operations_async", "_" + codeModel.Name.ToPythonCase() + "_operations_async.py"));
             }
 
-            var versionTemplate = new VersionTemplate { Model = codeModel, };
-            await Write(versionTemplate, Path.Combine(folderName, "version.py"));
+            // do we need to write out the version template file?
+            var versionPath = Path.Combine(folderName, "version.py");
+
+            // protect the version file
+            await Settings.Instance.Host.ProtectFiles(versionPath);
+
+            if( true != await Settings.Instance.Host.GetValue<bool?>("keep-version-file")  ||  string.IsNullOrEmpty(await Settings.Instance.Host.ReadFile(versionPath)) ) {
+                var versionTemplate = new VersionTemplate { Model = codeModel };
+                // if they didn't say to keep the old file (or it was not there/empty), write it out.
+                await Write(versionTemplate, versionPath);
+            }
+
 
             //Models
             var models = codeModel.ModelTemplateModels.Where(each => !each.Extensions.ContainsKey(AzureExtensions.ExternalExtension));

test/vanilla/Expected/AcceptanceTests/Header/header/aio/operations_async/_header_operations_async.py

@@ -1247,7 +1247,7 @@ class HeaderOperations:
         if raw:
             client_raw_response = ClientRawResponse(None, response)
             client_raw_response.add_headers({
-                'value': models.GreyscaleColors,
+                'value': 'str',
             })
             return client_raw_response
     response_enum.metadata = {'url': '/header/response/prim/enum'}

test/vanilla/Expected/AcceptanceTests/Header/header/operations/_header_operations.py

@@ -1247,7 +1247,7 @@ class HeaderOperations(object):
         if raw:
             client_raw_response = ClientRawResponse(None, response)
             client_raw_response.add_headers({
-                'value': models.GreyscaleColors,
+                'value': 'str',
             })
             return client_raw_response
     response_enum.metadata = {'url': '/header/response/prim/enum'}