Cleanup of comment creation (#42)

Refactor of comment creation code

cmd/revisions.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"github.com/xanzy/go-gitlab"
+)
+
+type RevisionsResponse struct {
+	SuccessResponse
+	Revisions []*gitlab.MergeRequestDiffVersion
+}
+
+func RevisionsHandler(w http.ResponseWriter, r *http.Request) {
+	c := r.Context().Value("client").(Client)
+	w.Header().Set("Content-Type", "application/json")
+
+	if r.Method != http.MethodGet {
+		c.handleError(w, errors.New("Invalid request type"), "That request type is not allowed", http.StatusMethodNotAllowed)
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		return
+	}
+
+	versionInfo, _, err := c.git.MergeRequests.GetMergeRequestDiffVersions(c.projectId, c.mergeId, &gitlab.GetMergeRequestDiffVersionsOptions{})
+	if err != nil {
+		c.handleError(w, err, "Could not get diff version info", http.StatusBadRequest)
+	}
+
+	w.WriteHeader(http.StatusOK)
+	response := RevisionsResponse{
+		SuccessResponse: SuccessResponse{
+			Message: "Revisions fetched successfully",
+			Status:  http.StatusOK,
+		},
+		Revisions: versionInfo,
+	}
+
+	json.NewEncoder(w).Encode(response)
+
+}