Fix Style/GuardClause.

Library/.rubocop_todo.yml

 # This configuration was generated by
 # `rubocop --auto-gen-config --exclude-limit 100`
-# on 2016-09-21 14:04:48 +0200 using RuboCop version 0.43.0.
+# on 2016-09-22 20:07:41 +0200 using RuboCop version 0.43.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -74,7 +74,7 @@ Metrics/BlockNesting:
 # Offense count: 20
 # Configuration parameters: CountComments.
 Metrics/ModuleLength:
-  Max: 373
+  Max: 370
 
 # Offense count: 2
 # Configuration parameters: CountKeywordArgs.
@@ -119,13 +119,6 @@ Style/ConstantName:
   Exclude:
     - 'Homebrew/os/mac.rb'
 
-# Offense count: 3
-Style/DoubleNegation:
-  Exclude:
-    - 'Homebrew/os/mac/cctools_keg.rb'
-    - 'Homebrew/os/mac/ruby_keg.rb'
-    - 'Homebrew/os/mac/xcode.rb'
-
 # Offense count: 1
 # Configuration parameters: EnforcedStyle, SupportedStyles.
 # SupportedStyles: format, sprintf, percent
@@ -140,25 +133,14 @@ Style/GlobalVars:
     - 'Homebrew/diagnostic.rb'
     - 'Homebrew/utils.rb'
 
-# Offense count: 97
+# Offense count: 70
 # Configuration parameters: MinBodyLength.
 Style/GuardClause:
   Exclude:
     - 'Taps/**/*'
-    - 'Homebrew/brew.rb'
-    - 'Homebrew/build.rb'
-    - 'Homebrew/caveats.rb'
-    - 'Homebrew/cleaner.rb'
-    - 'Homebrew/cmd/cleanup.rb'
-    - 'Homebrew/cmd/diy.rb'
-    - 'Homebrew/cmd/info.rb'
-    - 'Homebrew/cmd/install.rb'
-    - 'Homebrew/cmd/reinstall.rb'
-    - 'Homebrew/cmd/search.rb'
     - 'Homebrew/cmd/update-report.rb'
     - 'Homebrew/dependency_collector.rb'
     - 'Homebrew/dev-cmd/audit.rb'
-    - 'Homebrew/dev-cmd/bottle.rb'
     - 'Homebrew/dev-cmd/pull.rb'
     - 'Homebrew/dev-cmd/test-bot.rb'
     - 'Homebrew/download_strategy.rb'
@@ -188,7 +170,7 @@ Style/GuardClause:
     - 'Homebrew/utils/popen.rb'
     - 'Homebrew/version.rb'
 
-# Offense count: 52
+# Offense count: 51
 # Cop supports --auto-correct.
 # Configuration parameters: MaxLineLength.
 Style/IfUnlessModifier:
@@ -221,7 +203,6 @@ Style/IfUnlessModifier:
     - 'Homebrew/formulary.rb'
     - 'Homebrew/language/haskell.rb'
     - 'Homebrew/migrator.rb'
-    - 'Homebrew/os/mac/cctools_mach.rb'
     - 'Homebrew/tab.rb'
     - 'Homebrew/utils/git.rb'
 
@@ -277,11 +258,3 @@ Style/OpMethod:
 # SupportedStyles: use_perl_names, use_english_names
 Style/SpecialGlobalVars:
   EnforcedStyle: use_perl_names
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, SupportedStyles, AllowSafeAssignment.
-# SupportedStyles: require_parentheses, require_no_parentheses
-Style/TernaryParentheses:
-  Exclude:
-    - 'Homebrew/formula.rb'

Library/Homebrew/brew.rb

@@ -37,9 +37,9 @@ begin
   cmd = nil
 
   ARGV.dup.each_with_index do |arg, i|
-    if help_flag && cmd
-      break
-    elsif help_flag_list.include?(arg)
+    break if help_flag && cmd
+
+    if help_flag_list.include?(arg)
       # Option-style help: Both `--help <cmd>` and `<cmd> --help` are fine.
       help_flag = true
     elsif arg == "help" && !cmd

Library/Homebrew/build.rb

@@ -31,9 +31,8 @@ class Build
   def post_superenv_hacks
     # Only allow Homebrew-approved directories into the PATH, unless
     # a formula opts-in to allowing the user's path.
-    if formula.env.userpaths? || reqs.any? { |rq| rq.env.userpaths? }
-      ENV.userpaths!
-    end
+    return unless formula.env.userpaths? || reqs.any? { |rq| rq.env.userpaths? }
+    ENV.userpaths!
   end
 
   def effective_build_options_for(dependent)

Library/Homebrew/caveats.rb

@@ -69,27 +69,34 @@ class Caveats
   end
 
   def bash_completion_caveats
-    if keg && keg.completion_installed?(:bash) then <<-EOS.undent
+    return unless keg
+    return unless keg.completion_installed?(:bash)
+
+    <<-EOS.undent
       Bash completion has been installed to:
         #{HOMEBREW_PREFIX}/etc/bash_completion.d
-      EOS
-    end
+    EOS
   end
 
   def zsh_completion_caveats
-    if keg && keg.completion_installed?(:zsh) then <<-EOS.undent
+    return unless keg
+    return unless keg.completion_installed?(:zsh)
+
+    <<-EOS.undent
       zsh completion has been installed to:
         #{HOMEBREW_PREFIX}/share/zsh/site-functions
-      EOS
-    end
+    EOS
   end
 
   def fish_completion_caveats
-    if keg && keg.completion_installed?(:fish) && which("fish") then <<-EOS.undent
+    return unless keg
+    return unless keg.completion_installed?(:fish)
+    return unless which("fish")
+
+    <<-EOS.undent
       fish completion has been installed to:
         #{HOMEBREW_PREFIX}/share/fish/vendor_completions.d
-      EOS
-    end
+    EOS
   end
 
   def python_caveats
@@ -140,22 +147,24 @@ class Caveats
   end
 
   def app_caveats
-    if keg && keg.app_installed?
-      <<-EOS.undent
-        .app bundles were installed.
-        Run `brew linkapps #{keg.name}` to symlink these to /Applications.
-      EOS
-    end
+    return unless keg
+    return unless keg.app_installed?
+
+    <<-EOS.undent
+      .app bundles were installed.
+      Run `brew linkapps #{keg.name}` to symlink these to /Applications.
+    EOS
   end
 
   def elisp_caveats
     return if f.keg_only?
-    if keg && keg.elisp_installed?
-      <<-EOS.undent
-        Emacs Lisp files have been installed to:
-          #{HOMEBREW_PREFIX}/share/emacs/site-lisp/#{f.name}
-      EOS
-    end
+    return unless keg
+    return unless keg.elisp_installed?
+
+    <<-EOS.undent
+      Emacs Lisp files have been installed to:
+        #{HOMEBREW_PREFIX}/share/emacs/site-lisp/#{f.name}
+    EOS
   end
 
   def plist_caveats

Library/Homebrew/cleaner.rb

@@ -87,9 +87,9 @@ class Cleaner
 
       Find.prune if @f.skip_clean? path
 
-      if path.symlink? || path.directory?
-        next
-      elsif path.extname == ".la"
+      next if path.symlink? || path.directory?
+
+      if path.extname == ".la"
         path.unlink
       elsif path.basename.to_s == "perllocal.pod"
         # Both this file & the .packlist one below are completely unnecessary

Library/Homebrew/cmd/cleanup.rb

@@ -22,13 +22,13 @@ module Homebrew
       ARGV.resolved_formulae.each { |f| Cleanup.cleanup_formula f }
     end
 
-    if Cleanup.disk_cleanup_size > 0
-      disk_space = disk_usage_readable(Cleanup.disk_cleanup_size)
-      if ARGV.dry_run?
-        ohai "This operation would free approximately #{disk_space} of disk space."
-      else
-        ohai "This operation has freed approximately #{disk_space} of disk space."
-      end
+    return if Cleanup.disk_cleanup_size.zero?
+
+    disk_space = disk_usage_readable(Cleanup.disk_cleanup_size)
+    if ARGV.dry_run?
+      ohai "This operation would free approximately #{disk_space} of disk space."
+    else
+      ohai "This operation has freed approximately #{disk_space} of disk space."
     end
   end
 end

Library/Homebrew/cmd/diy.rb

@@ -31,11 +31,9 @@ module Homebrew
   def detect_version(path)
     version = path.version.to_s
 
-    if version.empty?
-      raise "Couldn't determine version, set it with --version=<version>"
-    else
-      version
-    end
+    raise "Couldn't determine version, set it with --version=<version>" if version.empty?
+
+    version
   end
 
   def detect_name(path, version)

Library/Homebrew/cmd/info.rb

@@ -54,11 +54,8 @@ module Homebrew
           end
         rescue FormulaUnavailableError
           # No formula with this name, try a blacklist lookup
-          if (blacklist = blacklisted?(f))
-            puts blacklist
-          else
-            raise
-          end
+          raise unless (blacklist = blacklisted?(f))
+          puts blacklist
         end
       end
     end

Library/Homebrew/cmd/install.rb

@@ -245,11 +245,11 @@ module Homebrew
   end
 
   def check_macports
-    unless MacOS.macports_or_fink.empty?
-      opoo "It appears you have MacPorts or Fink installed."
-      puts "Software installed with other package managers causes known problems for"
-      puts "Homebrew. If a formula fails to build, uninstall MacPorts/Fink and try again."
-    end
+    return if MacOS.macports_or_fink.empty?
+
+    opoo "It appears you have MacPorts or Fink installed."
+    puts "Software installed with other package managers causes known problems for"
+    puts "Homebrew. If a formula fails to build, uninstall MacPorts/Fink and try again."
   end
 
   def check_cellar

Library/Homebrew/cmd/reinstall.rb

@@ -58,10 +58,11 @@ module Homebrew
 
   def restore_backup(keg, formula)
     path = backup_path(keg)
-    if path.directory?
-      path.rename keg
-      keg.link unless formula.keg_only?
-    end
+
+    return unless path.directory?
+
+    path.rename keg
+    keg.link unless formula.keg_only?
   end
 
   def backup_path(path)

Library/Homebrew/cmd/search.rb

@@ -171,10 +171,11 @@ module Homebrew
       rescue
         canonical_name = canonical_full_name = name
       end
+
       # Ignore aliases from results when the full name was also found
-      if aliases.include?(name) && results.include?(canonical_full_name)
-        next
-      elsif (HOMEBREW_CELLAR/canonical_name).directory?
+      next if aliases.include?(name) && results.include?(canonical_full_name)
+
+      if (HOMEBREW_CELLAR/canonical_name).directory?
         pretty_installed(name)
       else
         name

Library/Homebrew/dev-cmd/audit.rb

@@ -83,11 +83,11 @@ module Homebrew
       end
     end
 
-    unless problem_count.zero?
-      problems = "problem" + plural(problem_count)
-      formulae = "formula" + plural(formula_count, "e")
-      ofail "#{problem_count} #{problems} in #{formula_count} #{formulae}"
-    end
+    return if problem_count.zero?
+
+    problems = "problem" + plural(problem_count)
+    formulae = "formula" + plural(formula_count, "e")
+    ofail "#{problem_count} #{problems} in #{formula_count} #{formulae}"
   end
 end
 
@@ -279,9 +279,11 @@ class FormulaAuditor
         end
       end
     end
+
     if present.include?("head") && present.include?("head block")
       problem "Should not have both `head` and `head do`"
     end
+
     if present.include?("bottle modifier") && present.include?("bottle block")
       problem "Should not have `bottle :unneeded/:disable` and `bottle do`"
     end
@@ -668,24 +670,26 @@ class FormulaAuditor
     end
 
     revision_map = attributes_map[:revision]
-    if formula.revision.nonzero?
-      if formula.stable
-        if revision_map[formula.stable.version].empty? # check stable spec
-          problem "'revision #{formula.revision}' should be removed"
-        end
-      else # head/devel-only formula
+
+    return if formula.revision.zero?
+
+    if formula.stable
+      if revision_map[formula.stable.version].empty? # check stable spec
         problem "'revision #{formula.revision}' should be removed"
       end
+    else # head/devel-only formula
+      problem "'revision #{formula.revision}' should be removed"
     end
   end
 
   def audit_legacy_patches
     return unless formula.respond_to?(:patches)
     legacy_patches = Patch.normalize_legacy_patches(formula.patches).grep(LegacyPatch)
-    unless legacy_patches.empty?
-      problem "Use the patch DSL instead of defining a 'patches' method"
-      legacy_patches.each { |p| audit_patch(p) }
-    end
+
+    return if legacy_patches.empty?
+
+    problem "Use the patch DSL instead of defining a 'patches' method"
+    legacy_patches.each { |p| audit_patch(p) }
   end
 
   def audit_patch(patch)
@@ -961,61 +965,56 @@ class FormulaAuditor
       problem "Use Language::Node for npm install args"
     end
 
-    if @strict
-      if line =~ /system ((["'])[^"' ]*(?:\s[^"' ]*)+\2)/
-        bad_system = $1
-        unless %w[| < > & ; *].any? { |c| bad_system.include? c }
-          good_system = bad_system.gsub(" ", "\", \"")
-          problem "Use `system #{good_system}` instead of `system #{bad_system}` "
-        end
-      end
+    return unless @strict
 
-      if line =~ /(require ["']formula["'])/
-        problem "`#{$1}` is now unnecessary"
+    if line =~ /system ((["'])[^"' ]*(?:\s[^"' ]*)+\2)/
+      bad_system = $1
+      unless %w[| < > & ; *].any? { |c| bad_system.include? c }
+        good_system = bad_system.gsub(" ", "\", \"")
+        problem "Use `system #{good_system}` instead of `system #{bad_system}` "
       end
+    end
 
-      if line =~ %r{#\{share\}/#{Regexp.escape(formula.name)}[/'"]}
-        problem "Use \#{pkgshare} instead of \#{share}/#{formula.name}"
-      end
+    if line =~ /(require ["']formula["'])/
+      problem "`#{$1}` is now unnecessary"
+    end
 
-      if line =~ %r{share(\s*[/+]\s*)(['"])#{Regexp.escape(formula.name)}(?:\2|/)}
-        problem "Use pkgshare instead of (share#{$1}\"#{formula.name}\")"
-      end
+    if line =~ %r{#\{share\}/#{Regexp.escape(formula.name)}[/'"]}
+      problem "Use \#{pkgshare} instead of \#{share}/#{formula.name}"
+    end
+
+    if line =~ %r{share(\s*[/+]\s*)(['"])#{Regexp.escape(formula.name)}(?:\2|/)}
+      problem "Use pkgshare instead of (share#{$1}\"#{formula.name}\")"
     end
   end
 
   def audit_caveats
-    caveats = formula.caveats.to_s
-
-    if caveats.include?("setuid")
-      problem "Don't recommend setuid in the caveats, suggest sudo instead."
-    end
+    return unless formula.caveats.to_s.include?("setuid")
+    problem "Don't recommend setuid in the caveats, suggest sudo instead."
   end
 
   def audit_reverse_migration
     # Only enforce for new formula being re-added to core and official taps
     return unless @strict
     return unless formula.tap && formula.tap.official?
+    return unless formula.tap.tap_migrations.key?(formula.name)
 
-    if formula.tap.tap_migrations.key?(formula.name)
-      problem <<-EOS.undent
-        #{formula.name} seems to be listed in tap_migrations.json!
-        Please remove #{formula.name} from present tap & tap_migrations.json
-        before submitting it to Homebrew/homebrew-#{formula.tap.repo}.
-      EOS
-    end
+    problem <<-EOS.undent
+      #{formula.name} seems to be listed in tap_migrations.json!
+      Please remove #{formula.name} from present tap & tap_migrations.json
+      before submitting it to Homebrew/homebrew-#{formula.tap.repo}.
+    EOS
   end
 
   def audit_prefix_has_contents
     return unless formula.prefix.directory?
+    return unless Keg.new(formula.prefix).empty_installation?
 
-    if Keg.new(formula.prefix).empty_installation?
-      problem <<-EOS.undent
-        The installation seems to be empty. Please ensure the prefix
-        is set correctly and expected files are installed.
-        The prefix configure/make argument may be case-sensitive.
-      EOS
-    end
+    problem <<-EOS.undent
+      The installation seems to be empty. Please ensure the prefix
+      is set correctly and expected files are installed.
+      The prefix configure/make argument may be case-sensitive.
+    EOS
   end
 
   def audit_conditional_dep(dep, condition, line)
@@ -1184,9 +1183,7 @@ class ResourceAuditor
       end
     end
 
-    using_strategy = DownloadStrategyDetector.detect("", using)
-
-    if url_strategy == using_strategy
+    if url_strategy == DownloadStrategyDetector.detect("", using)
       problem "Redundant :using value in URL"
     end
   end

Library/Homebrew/dev-cmd/bottle.rb

@@ -51,10 +51,11 @@ module Homebrew
       end
 
       @put_filenames ||= []
-      unless @put_filenames.include? filename
-        puts "#{Tty.red}#{filename}#{Tty.reset}"
-        @put_filenames << filename
-      end
+
+      return if @put_filenames.include? filename
+
+      puts "#{Tty.red}#{filename}#{Tty.reset}"
+      @put_filenames << filename
     end
 
     result = false
@@ -137,11 +138,11 @@ module Homebrew
     tap = f.tap
 
     unless tap
-      if ARGV.include?("--force-core-tap")
-        tap = CoreTap.instance
-      else
+      unless ARGV.include?("--force-core-tap")
         return ofail "Formula not from core or any taps: #{f.full_name}"
       end
+
+      tap = CoreTap.instance
     end
 
     if f.bottle_disabled?
@@ -323,34 +324,33 @@ module Homebrew
     puts "./#{filename}"
     puts output
 
-    if ARGV.include? "--json"
-      json = {
-        f.full_name => {
-          "formula" => {
-            "pkg_version" => f.pkg_version.to_s,
-            "path" => f.path.to_s.strip_prefix("#{HOMEBREW_REPOSITORY}/"),
-          },
-          "bottle" => {
-            "root_url" => bottle.root_url,
-            "prefix" => bottle.prefix,
-            "cellar" => bottle.cellar.to_s,
-            "rebuild" => bottle.rebuild,
-            "tags" => {
-              Utils::Bottles.tag.to_s => {
-                "filename" => filename.to_s,
-                "sha256" => sha256,
-              },
+    return unless ARGV.include? "--json"
+    json = {
+      f.full_name => {
+        "formula" => {
+          "pkg_version" => f.pkg_version.to_s,
+          "path" => f.path.to_s.strip_prefix("#{HOMEBREW_REPOSITORY}/"),
+        },
+        "bottle" => {
+          "root_url" => bottle.root_url,
+          "prefix" => bottle.prefix,
+          "cellar" => bottle.cellar.to_s,
+          "rebuild" => bottle.rebuild,
+          "tags" => {
+            Utils::Bottles.tag.to_s => {
+              "filename" => filename.to_s,
+              "sha256" => sha256,
             },
           },
-          "bintray" => {
-            "package" => Utils::Bottles::Bintray.package(f.name),
-            "repository" => Utils::Bottles::Bintray.repository(tap),
-          },
         },
-      }
-      File.open("#{filename.prefix}.bottle.json", "w") do |file|
-        file.write Utils::JSON.dump json
-      end
+        "bintray" => {
+          "package" => Utils::Bottles::Bintray.package(f.name),
+          "repository" => Utils::Bottles::Bintray.repository(tap),
+        },
+      },
+    }
+    File.open("#{filename.prefix}.bottle.json", "w") do |file|
+      file.write Utils::JSON.dump json
     end
   end