Add dlang support (ldc2,ldmd2,dub)

packages/dub.rb

+require 'package'
+
+class Dub < Package
+  description 'Developer package manager for D programming language'
+  homepage 'https://github.com/D-Programming-Language/dub'
+  version '1.7.1'
+  source_url 'https://github.com/dlang/dub/archive/v1.7.1.tar.gz'
+  source_sha256 'baa8c533f59d83f74e89c06f5ec7e52daf3becb227c7177a9eeab7159ba86dbc'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'ldc'
+
+  def self.build
+    system "echo \"module dub.version_;\" > source/dub/version_.d"
+    system "echo 'enum dubVersion = \"1.7.1\";' >> source/dub/version_.d"
+    system "ldmd2 -ofbin/dub -w -O -g -version=DubUseCurl -Isource -L-lcurl @build-files.txt"
+  end
+
+  def self.install
+    system "install", "-Dm755",  "bin/dub", "#{CREW_DEST_PREFIX}/bin/dub"
+  end
+end

packages/ldc.rb

+require 'package'
+
+class Ldc < Package                 # The first character of the class name must be upper case
+  description 'D language compiler using LLVM.'
+  homepage 'https://github.com/ldc-developers/ldc'
+  version '1.7.0'
+  source_url 'https://github.com/ldc-developers/ldc/releases/download/v1.7.0/ldc-1.7.0-src.tar.gz'
+  source_sha256 '7cd46140ca3e4ca0d52c352e5b694d4d5336898ed4f02c3e18e0eafd69dd18bd'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'llvm'
+  depends_on 'curl'
+  depends_on 'gcc'
+  depends_on 'ncurses'
+  depends_on 'zlibpkg'
+  depends_on 'libconfig' => :build
+  depends_on 'cmake' => :build
+  depends_on 'libedit' => :build
+
+  def self.build                   # the steps required to build the package
+    system "mkdir", "build"
+    system "curl -L https://github.com/ldc-developers/ldc/releases/download/v0.17.5/{ldc-0.17.5-src.tar.gz} -o \"#1\""
+    abort 'Checksum mismatch. :/ Try again.'.lightred unless Digest::SHA256.hexdigest( File.read('ldc-0.17.5-src.tar.gz') ) == '7aa540a135f9fa1ee9722cad73100a8f3600a07f9a11d199d8be68887cc90008'
+    system "tar xzf ldc-0.17.5-src.tar.gz -C build"
+    system "cmake", "-Bbuild/ldc-0.17.5-src", "-Hbuild/ldc-0.17.5-src"
+    system "make", "-C", "build/ldc-0.17.5-src", "-j#{CREW_NPROC}" 
+    system "cmake", "-DCMAKE_BUILD_TYPE=Release", "-DCMAKE_SKIP_RPATH=ON", "-DBUILD_SHARED_LIBS=BOTH",
+                    "-DLDC_WITH_LLD=OFF", "-DD_COMPILER=build/ldc-0.17.5-src/bin/ldmd2",
+                    "-DCMAKE_INSTALL_PREFIX=#{CREW_PREFIX}", "-Bbuild", "-H."
+    system "make", "-C", "build", "-j#{CREW_NPROC}"
+  end
+
+  def self.install                 # the steps required to install the package
+    system "make", "-C", "build", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end

packages/libconfig.rb

+require 'package'
+
+class Libconfig < Package
+  description 'C/C++ Configuration File Library.'
+  homepage 'https://hyperrealm.github.io/libconfig/'
+  version '1.7.2'
+  source_url 'https://hyperrealm.github.io/libconfig/dist/libconfig-1.7.2.tar.gz'
+  source_sha256 '7c3c7a9c73ff3302084386e96f903eb62ce06953bb1666235fac74363a16fad9'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  def self.build
+    system "./configure --prefix=#{CREW_PREFIX} --libdir=#{CREW_LIB_PREFIX}" 
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end