Avoid ingesting windows pathnames with backslashes -- convert to forw…

…ard slashes

CHANGELOG.md

@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Referring to an undefined platform no longer causes a crash; it's now a helpful error message
 - A copy/paste error that prevented compiler warning flags from being supplied has been fixed, via jgfoster
 - RSpec was not communicating compile errors from unit test executables that failed to build. Now it does, via jgfoster
+- Windows paths now avoid picking up backslashes, for proper equality comparisons
 
 ### Security
 

lib/arduino_ci/arduino_downloader.rb

@@ -43,7 +43,7 @@ def self.autolocated_executable
     # The executable Arduino file in an existing installation, or nil
     # @return [Pathname]
     def self.existing_executable
-      self.must_implement(__method__)
+      Host.which("arduino-cli")
     end
 
     # The local file (dir) name of the desired IDE package (zip/tar/etc)

lib/arduino_ci/arduino_downloader_linux.rb

@@ -17,12 +17,6 @@ def self.extracted_file
       "arduino-cli"
     end
 
-    # The executable Arduino file in an existing installation, or nil
-    # @return [string]
-    def self.existing_executable
-      Host.which("arduino-cli")
-    end
-
     # Make any preparations or run any checks prior to making changes
     # @return [string] Error message, or nil if success
     def prepare

lib/arduino_ci/arduino_downloader_osx.rb

@@ -17,12 +17,6 @@ def self.extracted_file
       "arduino-cli"
     end
 
-    # The executable Arduino file in an existing installation, or nil
-    # @return [string]
-    def self.existing_executable
-      Host.which("arduino-cli")
-    end
-
     # Make any preparations or run any checks prior to making changes
     # @return [string] Error message, or nil if success
     def prepare

lib/arduino_ci/arduino_downloader_windows.rb

@@ -28,12 +28,6 @@ def package_file
       "arduino-cli_#{@desired_version}_Windows_64bit.zip"
     end
 
-    # The executable Arduino file in an existing installation, or nil
-    # @return [string]
-    def self.existing_executable
-      Host.which("arduino-cli")
-    end
-
     # The technology that will be used to extract the download
     # (for logging purposes)
     # @return [string]
@@ -57,5 +51,11 @@ def self.extracted_file
       "arduino-cli.exe"
     end
 
+    # The executable Arduino file in a forced installation, or nil
+    # @return [Pathname]
+    def self.force_installed_executable
+      Pathname.new(Host.windows_to_pathname(ENV['HOME'])) + self.extracted_file
+    end
+
   end
 end

lib/arduino_ci/host.rb

@@ -17,13 +17,14 @@ class Host
     # via https://stackoverflow.com/a/5471032/2063546
     #   which('ruby') #=> /usr/bin/ruby
     # @param cmd [String] the command to search for
-    # @return [String] the full path to the command if it exists
+    # @return [Pathname] the full path to the command if it exists
     def self.which(cmd)
       exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
-      ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
+      ENV['PATH'].split(File::PATH_SEPARATOR).each do |string_path|
+        path = OS.windows? ? windows_to_pathname(string_path) : Pathname.new(string_path)
         exts.each do |ext|
-          exe = File.join(path, "#{cmd}#{ext}")
-          return exe if File.executable?(exe) && !File.directory?(exe)
+          exe = path.join("#{cmd}#{ext}")
+          return exe if exe.executable? && !exe.directory?
         end
       end
       nil