Move dcd.common into separate subpackage

This allows external projects to depend on dcd:common, which is needed
to embed DCD clients

common/dub.sdl

@@ -0,0 +1,7 @@
+name "common"
+stringImportPaths "../bin"
+preGenerateCommands "rdmd \"$PACKAGE_DIR/dubhash.d\""
+sourcePaths "src"
+importPaths "src"
+
+dependency "msgpack-d" version="~>1.0.0-beta.7"

common/dubhash.d

@@ -11,13 +11,13 @@ import std.string;
 void main()
 {
     auto dir = environment.get("DUB_PACKAGE_DIR");
-    auto hashFile = dir.buildPath("bin", "dubhash.txt");
+    auto hashFile = dir.buildPath("..", "bin", "dubhash.txt");
     auto gitVer = executeShell("git -C " ~ dir ~ " describe --tags");
     auto ver = (gitVer.status == 0 ? gitVer.output.strip
             : "v" ~ dir.dirName.baseName.findSplitAfter(
                 environment.get("DUB_ROOT_PACKAGE") ~ "-")[1]).ifThrown("0.0.0")
         .chain(newline).to!string.strip;
-    dir.buildPath("bin").mkdirRecurse;
+    dir.buildPath("..", "bin").mkdirRecurse;
     if (!hashFile.exists || ver != hashFile.readText.strip)
         hashFile.write(ver);
 }

constants-gen/generator.d

@@ -206,7 +206,7 @@ immutable ConstantCompletion[] traits = [
 
 	string part3 = "];";
 
-	auto file = File("../src/dcd/common/constants2.d", "w");
+	auto file = File("../common/src/dcd/common/constants2.d", "w");
 	file.writeln(part1);
 	foreach (pragma_; pragmas.sorted)
 		file.writeln('\t', pragma_, ",");

dub.json

@@ -9,13 +9,11 @@
   "dependencies": {
     "dsymbol": "~>0.9.0",
     "libdparse": "~>0.13.0",
-    "msgpack-d": "~>1.0.0-beta.7",
+    ":common": "*",
     "stdx-allocator": "~>2.77.5",
     "emsi_containers": "~>0.8.0-alpha.15"
   },
-  "stringImportPaths" : [
-    "bin"
-  ],
+  "subPackages": ["common"],
   "versions": ["built_with_dub"],
   "configurations": [
     {
@@ -29,7 +27,7 @@
     {
       "name": "client",
       "targetType": "executable",
-	  "targetPath": "bin/",
+      "targetPath": "bin/",
       "targetName": "dcd-client",
       "excludedSourceFiles": [
         "src/dcd/server/*"
@@ -38,14 +36,11 @@
     {
       "name": "server",
       "targetType": "executable",
-	  "targetPath": "bin/",
+      "targetPath": "bin/",
       "targetName": "dcd-server",
       "excludedSourceFiles": [
         "src/dcd/client/*"
       ]
     }
-  ],
-  "preGenerateCommands" : [
-    "rdmd \"$PACKAGE_DIR/dubhash.d\""
   ]
 }

makefile

@@ -31,7 +31,7 @@ clean:
 	rm -f *.o
 
 CLIENT_SRC := \
-	$(shell find src/dcd/common -name "*.d")\
+	$(shell find common/src/dcd/common -name "*.d")\
 	$(shell find src/dcd/client -name "*.d")\
 	$(shell find msgpack-d/src/ -name "*.d")
 
@@ -62,7 +62,7 @@ override LDC_CLIENT_FLAGS += $(DFLAGS)
 override GDC_CLIENT_FLAGS += $(DFLAGS)
 
 SERVER_SRC := \
-	$(shell find src/dcd/common -name "*.d")\
+	$(shell find common/src/dcd/common -name "*.d")\
 	$(shell find src/dcd/server -name "*.d")\
 	$(shell find ${DSYMBOL_DIR}/src -name "*.d")\
 	$(shell find ${STDXALLOC_DIR}/source -name "*.d")\