Add GitLab reporter

lib/erb_lint/reporters/gitlab_reporter.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+require "json"
+
+module ERBLint
+  module Reporters
+    class GitlabReporter < Reporter
+      def preview; end
+
+      def show
+        puts formatted_data
+      end
+
+      private
+
+      def formatted_data
+        formatted_files.to_json
+      end
+
+      def formatted_files
+        processed_files.flat_map do |filename, offenses|
+          formatted_offenses(filename, offenses)
+        end
+      end
+
+      def formatted_offenses(filename, offenses)
+        offenses.map do |offense|
+          format_offense(filename, offense)
+        end
+      end
+
+      def format_offense(filename, offense)
+        {
+          description: offense.message,
+          check_name: offense.simple_name,
+          fingerprint: generate_fingerprint(filename, offense),
+          severity: offense.severity,
+          location: {
+            path: filename,
+            lines: {
+              begin: offense.line_number,
+              end: offense.last_line
+            }
+          }
+        }
+      end
+
+      def generate_fingerprint(filename, offense)
+        Digest::MD5.hexdigest(
+          "#{offense.simple_name}@#{filename}:#{offense.line_number}:#{offense.last_line}"
+        )
+      end
+    end
+  end
+end

spec/erb_lint/reporters/gitlab_reporter_spec.rb

@@ -0,0 +1,81 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+describe ERBLint::Reporters::GitlabReporter do
+  describe ".show" do
+    subject { described_class.new(stats, false).show }
+
+    let(:stats) do
+      ERBLint::Stats.new(
+        found: 2,
+        processed_files: {
+          "app/views/subscriptions/_loader.html.erb" => offenses,
+        },
+        corrected: 1
+      )
+    end
+
+    let(:offenses) do
+      [
+        instance_double(
+          ERBLint::Offense,
+          message: "Extra space detected where there should be no space.",
+          line_number: 1,
+          column: 7,
+          simple_name: "SpaceInHtmlTag",
+          severity: "info",
+          last_line: 1,
+          last_column: 9,
+          length: 2,
+        ),
+        instance_double(
+          ERBLint::Offense,
+          message: "Remove newline before `%>` to match start of tag.",
+          line_number: 52,
+          column: 10,
+          simple_name: "ClosingErbTagIndent",
+          severity: "warning",
+          last_line: 54,
+          last_column: 10,
+          length: 10,
+        ),
+      ]
+    end
+
+    let(:expected_hash) do
+      [
+        {
+          description: "Extra space detected where there should be no space.",
+          check_name: "SpaceInHtmlTag",
+          fingerprint: "5a259c7cafa2c9ca229dfd7d21536698",
+          severity: "info",
+          location: {
+            path: "app/views/subscriptions/_loader.html.erb",
+            lines: {
+              begin: 1,
+              end: 1
+            }
+          }
+        },
+        {
+          description: "Remove newline before `%>` to match start of tag.",
+          check_name: "ClosingErbTagIndent",
+          fingerprint: "60b4ed2120c7abeebebb43fba4a19559",
+          severity: "warning",
+          location: {
+            path: "app/views/subscriptions/_loader.html.erb",
+            lines: {
+              begin: 52,
+              end: 54
+            }
+          }
+        }
+      ]
+    end
+
+    it "displays formatted offenses output" do
+      expect { subject }.to(output(expected_hash.to_json + "\n").to_stdout)
+    end
+  end
+end