Add source branch filter (#58)

README.md

@@ -29,6 +29,7 @@ resources:
 * `pipeline_name`(string): When set, this url will be used to override `BUILD_PIPELINE_NAME` during commit status updates.  
 * `labels`(string[]): Filter merge requests by label`[]`
 * `target_branch`(string): Filter merge requests by target_branch. Default is empty string.
+* `source_branch`(string): Filter merge requests by source_branch. Default is empty string.
 * `sort` (string): Merge requests sorting order, either `asc` (default) or `desc` to reverse.
 
 ## Behavior

pkg/check/command.go

@@ -32,7 +32,9 @@ func (command *Command) Run(request Request) (Response, error) {
 		Sort:         gitlab.String(sort),
 		Labels:       &labels,
 		TargetBranch: gitlab.String(request.Source.TargetBranch),
+		SourceBranch: gitlab.String(request.Source.SourceBranch),
 	}
+
 	requests, _, err := command.client.MergeRequests.ListProjectMergeRequests(request.Source.GetProjectPath(), options)
 	if err != nil {
 		return Response{}, err

pkg/models.go

@@ -20,6 +20,7 @@ type Source struct {
 	PipelineName       string   `json:"pipeline_name,omitempty"`
 	Labels             []string `json:"labels,omitempty"`
 	TargetBranch       string   `json:"target_branch,omitempty"`
+	SourceBranch       string   `json:"source_branch,omitempty"`
 	Sort               string   `json:"sort,omitempty"`
 	Paths              []string `json:"paths,omitempty"`
 	IgnorePaths        []string `json:"ignore_paths,omitempty"`