Dangerfile

##### Configuration file used for the Danger action. See https://danger.systems/ruby/ for more info. #####

# 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 when there is a big PR
warn("Big PR") if git.lines_of_code > 500

# Warn summary on pull request
if github.pr_body.length < 5
  warn "Please provide a summary in the Pull Request description"
end

# Analyze documentation
textlint.config_file = '.github/linter/.textlintrc'
textlint.max_severity = "warn"
textlint.lint

# Flutter analyze warnings
flutter_lint.only_modified_files = true
flutter_lint.report_path = "flutter_analyze_report.txt"
flutter_lint.lint(inline_mode: true)

files = git.added_files + git.modified_files
files.each do |f|
    diff = git.diff_for_file(f)

    # Check for uses of S.of(context) or similar
    if f =~ /.*\.dart/ and diff.patch =~ /^\+.*S\.of\(.+\)/m
        File.readlines(f).each_with_index do |line, index|
            if line =~ /S\.of\(.+\)/
                warn("Use S.current instead of S.of(context)", file: f, line: index+1)
            end
        end
    end

    # Check comment formatting
    if f =~ /.*\.dart/ and diff.patch =~ /([^:](\/\/)[^ \n\/])|((\/\/\/)[^ \n])|(\/\*)/m
        File.readlines(f).each_with_index do |line, index|
            if line =~ /\/\*/
                warn("Don't use block comments", file: f, line: index+1)
            elsif line =~ /(\/\/\/)[^ \n]/
                if line =~ /\/{4}/
                    warn("That's probably too many slashes", file: f, line: index+1)
                else
                    warn("Add a space between \"///\" and the actual comment", file: f, line: index+1)
                end
            elsif line =~ /[^:](\/\/)[^ \n\/]/
                warn("Add a space between \"//\" and the actual comment", file: f, line: index+1)
            end
        end
    end
end

# Whether we should reference the versioning documentation in the Danger report
show_versioning_info = false
# Whether to show a hint about marking the PR as #trivial
show_trivial_hint = false

has_app_changes = !git.modified_files.grep(/lib/).empty?
has_test_changes = !git.modified_files.grep(/test/).empty?
has_pubspec_changes = !git.modified_files.grep(/pubspec.yaml/).empty?
base_branch_is_master = github.branch_for_base == "master"

# Check that the tests were updated if there are app updates
if !declared_trivial && has_app_changes && !has_test_changes
    warn "No test changes detected. You should usually add at least one test for any new functionality."
    show_trivial_hint = true
end

# Check that the pubspec version was updated
if base_branch_is_master && has_app_changes
    if !has_pubspec_changes
        failure "No pubspec.yaml changes detected. Did you forget to update the version?"
        show_versioning_info = true
    else
        diff = git.diff_for_file('pubspec.yaml')
        if diff.patch !~ /\+version:/
            failure "The pubspec.yaml file was updated, but not the version."
            show_versioning_info = true
        else
            old_version = diff.patch[/\-version: .*\+\K([0-9]+)/].to_i
            new_version = diff.patch[/\+version: .*\+\K([0-9]+)/].to_i

            if new_version - old_version != 1
                failure "The build number in pubspec.yaml should be incremented by 1"
                show_versioning_info = true
            elsif !declared_trivial
                ['en-GB', 'en-US', 'ro'].each do |language|
                    changelog_rxp = /android\/fastlane\/metadata\/android\/#{language}\/changelogs\/#{new_version + 10000}\.txt/
                    if git.added_files.grep(changelog_rxp).empty?
                        changelog = "android/fastlane/metadata/android/#{language}/changelogs/#{new_version + 10000}.txt"
                        warn "Missing #{language} changelog entry at #{changelog}"
                        show_trivial_hint = true
                    end
                end
            end
        end
    end
end

if show_versioning_info
    markdown "For more info on versioning, check out our [PR guidelines](https://github.com/student-hub/acs-upb-mobile/blob/master/CONTRIBUTING.md#guidelines)."
end

if show_trivial_hint
    markdown "If this is a trivial change that doesn't warrant a test or changelog entry, you can mark it as #trivial in the PR title."
end