Filter git diff issues only.

lib/iblinter/plugin.rb

@@ -29,6 +29,8 @@ def lint(path = Dir.pwd, fail_on_warning: false, inline_mode: true, options: {})
       end
 
       issues = iblinter.lint(path, options)
+      issues = filter_git_diff_issues(issues)
+
       return if issues.empty?
 
       errors = issues.select { |v| v["level"] == "error" }
@@ -38,7 +40,7 @@ def lint(path = Dir.pwd, fail_on_warning: false, inline_mode: true, options: {})
         send_inline_comment(warnings, fail_on_warning ? :fail : :warn)
         send_inline_comment(errors, :fail)
       else
-        message = "### IBLinter found issues\n\n"
+        message = "### IBLinter found issues\n\n".dup
         message << markdown_issues(errors, "Errors", ":rotating_light:") unless errors.empty?
         message << markdown_issues(warnings, "Warnings", ":warning:") unless warnings.empty?
         markdown message
@@ -67,8 +69,56 @@ def iblinter_installed?
       !`which iblinter`.empty?
     end
 
+    # Filters issues reported against changes in the modified files
+    #
+    # @return [Array] swiftlint issues
+    def filter_git_diff_issues(issues)
+      modified_files_info = git_modified_files_info()
+      return issues.select { |i| 
+           modified_files_info["#{i['file']}"] != nil
+        }
+    end
+
+    # Finds modified files and added files, creates array of files with modified line numbers
+    #
+    # @return [Array] Git diff changes for each file
+    def git_modified_files_info()
+        modified_files_info = Hash.new
+        updated_files = (git.modified_files - git.deleted_files) + git.added_files
+        updated_files.each {|file|
+            modified_lines = git_modified_lines(file)
+            modified_files_info[File.expand_path(file)] = modified_lines
+        }
+        modified_files_info
+    end
+
+    # Gets git patch info and finds modified line numbers, excludes removed lines
+    #
+    # @return [Array] Modified line numbers i
+    def git_modified_lines(file)
+      git_range_info_line_regex = /^@@ .+\+(?<line_number>\d+),/ 
+      git_modified_line_regex = /^\+(?!\+|\+)/
+      git_removed_line_regex = /^[-]/
+      git_not_removed_line_regex = /^[^-]/
+      file_info = git.diff_for_file(file)
+      line_number = 0
+      lines = []
+      file_info.patch.split("\n").each do |line|
+          starting_line_number = 0
+          case line
+          when git_range_info_line_regex
+              starting_line_number = Regexp.last_match[:line_number].to_i
+          when git_modified_line_regex
+              lines << line_number
+          end
+          line_number += 1 if line_number > 0
+          line_number = starting_line_number if line_number == 0 && starting_line_number > 0
+      end
+      lines
+    end
+
     def markdown_issues(results, heading, emoji)
-      message = "#### #{heading}\n\n"
+      message = "#### #{heading}\n\n".dup
 
       message << "|   | File | Hint |\n"
       message << "|---| ---- | -----|\n"
@@ -86,7 +136,7 @@ def send_inline_comment(results, method)
       dir = "#{Dir.pwd}/"
       results.each do |r|
         filename = r["file"].gsub(dir, "")
-        send(method, r["message"], file: filename, line: 0)
+        send(method, r["message"], file: filename, line: 1)
       end
     end
   end