Dangerfile

require "json"

# Sometimes it's a README fix, or something like that - which isn't relevant for
# including in a project's CHANGELOG for example
declared_trivial = github.pr_title.include? "#trivial"

# Make it more obvious that a PR is a work in progress and shouldn't be merged yet
warn("PR is classed as Work in Progress") if github.pr_title.include? "[WIP]"
warn("PR is classed as Work in Progress") if github.pr_title.include? "WIP"

# Message on Carthage changes
message("This PR changes Carthage dependencies") if git.modified_files.include? "Sources/Cartfile" 

# Message on configuration changes
message("This PR changes CI dendency gems") if git.modified_files.include? "Gemfile"
message("This PR changes Fastlane configuration") if git.modified_files.include? "fastlane/Fastfile"
message("This PR changes Danger configuration") if git.modified_files.include? "Dangerfile"

# Warn when there is a big PR
warn("This PR seems bigger than it should be!") if git.lines_of_code > 500

# Custom linting
def markdown_issues(results, heading)
    message = "#### #{heading}\n\n".dup

    message << "File | Line | Reason |\n"
    message << "| --- | ----- | ----- |\n"

    results.each do |r|
        filename = r['file'].split('/').last
        line = r['line']
        reason = r['reason']
        rule = r['rule_id']
        # Other available properties can be found int SwiftLint/…/JSONReporter.swift
        message << "#{filename} | #{line} | #{reason} (#{rule})\n"
    end

    message
end

# Custom linting
Dir.chdir "Sources" do
    result = `swiftlint --reporter json --config .swiftlint.yml`
    issues = JSON.parse(result).flatten
    
    if issues.count > 0
        # Filter warnings and errors
        warnings = issues.select { |issue| issue['severity'] == 'Warning' }
        errors = issues.select { |issue| issue['severity'] == 'Error' }

        message = "### SwiftLint found issues \n\n".dup
        message << markdown_issues(warnings, 'Warnings') unless warnings.empty?
        message << markdown_issues(errors, 'Errors') unless errors.empty?            

        markdown message
    end
end