Improved error reporting a bit.

src/context.cr

@@ -1,3 +1,4 @@
+require "./exception.cr"
 
 require "./config.cr"
 

src/exception.cr

@@ -0,0 +1,32 @@
+
+class Package::Exception < Exception
+	getter recipe : Recipe
+	def initialize(@recipe, message : String)
+		super message
+	end
+end
+
+class Package::DownloadError < Package::Exception
+	getter url : URI
+	def initialize(recipe : Recipe, @url)
+		super recipe, "Downloading one of the sources failed."
+	end
+end
+
+class Package::ExtractionError < Package::Exception
+	getter url : URI
+	def initialize(recipe : Recipe, @url)
+		super recipe, "Extracting one of the sources failed."
+	end
+end
+
+class Package::BuildError < Package::Exception
+end
+
+class Package::PackagingError < Package::Exception
+	getter package : Package
+	def initialize(recipe : Recipe, @package)
+		super recipe, "Assembling a package failed."
+	end
+end
+

src/instructions.cr

@@ -19,7 +19,8 @@ end
 
 class Package::Instructions
 	class Set < Array(String)
-		def initialize(@phase : String)
+		getter phase : String
+		def initialize(@phase)
 			super()
 		end
 		# FIXME: def execute

src/main.cr

@@ -74,20 +74,31 @@ end
 # FIXME: Now we need to build their respective deptrees and to deduplicate
 #        the list of recipes.
 
+begin
+	latest_build_dir = ""
 	recipes.each do |recipe|
+		latest_build_dir = recipe.building_directory
+
 		puts " >> #{recipe.name}".colorize :white
 
-	raise "oh no, download failed" unless recipe.download
+		recipe.download
 
-	if download_only
-		exit 0
-	end
+		next if download_only
 
-	raise "oh no, extraction failed" unless recipe.extract
+		recipe.extract
 
-	raise "oh no, build failed" unless recipe.build
-	raise "oh no, packaging failed" unless recipe.package
+		recipe.build
+		recipe.package
 
 		recipe.clean unless do_not_clean
 	end
+rescue e : Package::Exception
+	STDERR.puts "!! #{e.message}".colorize(:red).bright
+	STDERR.puts "!! You may want to inspect the build directory at #{latest_build_dir}"
+	exit 1
+rescue e
+	STDERR.puts "!! An unexpected error occured:".colorize(:red).bright
+	STDERR.puts e
+	exit 1
+end
 

src/recipe.cr

@@ -1,4 +1,3 @@
-
 require "uuid"
 require "uri"
 require "file_utils"
@@ -9,6 +8,7 @@ require "./context.cr"
 require "./package.cr"
 require "./instructions.cr"
 require "./sources.cr"
+require "./exception.cr"
 
 # 🤔
 class URI
@@ -184,28 +184,32 @@ class Package::Recipe
 		@dirname || "#{name}-#{version}"
 	end
 
-	def download : Bool
-		sources
-			.compact_map do |url|
+	def download
+		sources.each do |url|
 			unless File.exists? url.basename
-					@context.run @context.sources_directory, "wget", [ url.to_s, "-O", url.basename ]
+				status = @context.run @context.sources_directory, "wget", [ url.to_s, "-O", url.basename ]
+
+				raise DownloadError.new self, url unless status.success?
 			end
 		end
-			.map(&.success?)
-			.reduce(true) { |a, b| a && b }
 	end
 
-	def extract : Bool
+	def extract
 		Dir.mkdir_p building_directory
 
-		sources
-			.map do |url|
+		sources.each do |url|
 			basename = url.basename
 
-				@context.run building_directory, "bsdtar", [ "xvf", @context.sources_directory + "/" + url.basename ]
+			status = @context.run(
+				building_directory,
+				"bsdtar", [
+					"xvf",
+					@context.sources_directory + "/" + url.basename
+				]
+			)
+
+			raise ExtractionError.new self, url unless status.success?
 		end
-			.map(&.success?)
-			.reduce true { |a, b| a && b }
 	end
 
 	# TODO:
@@ -215,9 +219,7 @@ class Package::Recipe
 	#   - Be careful about return values, flee from everything if something
 	#     goes somehow wrong.
 	#   - Make things thread-safe. (those ENV[]= calls are definitely not)
-	def build : Bool
-		success = true
-
+	def build
 		Dir.mkdir_p fake_root_directory
 
 		ENV["PKG"] = fake_root_directory
@@ -227,7 +229,7 @@ class Package::Recipe
 
 		instructions.to_a.each do |instruction|
 			if instruction.run(@context, self).failed?
-				success = false
+				raise BuildError.new self, "Building (#{instruction.phase} phase) failed."
 				break
 			end
 		end
@@ -236,11 +238,11 @@ class Package::Recipe
 
 		ENV["PKG"] = nil
 
-		success = false if Dir.children(fake_root_directory).size == 0
+		if Dir.children(fake_root_directory).size == 0
+			raise BuildError.new self, "No file was installed in the fake root."
+		end
 
-		do_splits if success
-
-		success
+		do_splits
 	end
 
 	private def do_splits
@@ -295,18 +297,18 @@ class Package::Recipe
 	# TODO:
 	#  - Errors management. Stop at first failure?
 	#  - Splits. This should be done between #build and #package.
-	def package : Bool
+	def package
 		# This tries to build them all and stops at the first failure
 		# (failures are currently reported by Context#package)
-		(@packages + auto_splits)
-			.find do |package|
+		(@packages + auto_splits).each do |package|
 			if package.automatic && ! File.exists? package.fake_root_directory
 				next
 			end
 
-				! @context.package package
+			unless @context.package package
+				raise PackagingError.new self, package
+			end
 		end
-			.== nil
 	end
 
 	def clean