setup.py updates

- parametrise module list
- allow optional modules (pyopencl, PyQt4)
- add setuptools
- add compiler error detection
- press return to continue

setup.py

@@ -24,7 +24,7 @@ packageManager = {
 }
 
 packageName = {
-    "PyQt": {
+    "PyQt4": {
         "OpenBSD": "py-qt4",
         "FreeBSD": "py27-qt4",
         "Debian": "python-qt4",
@@ -32,7 +32,12 @@ packageName = {
         "openSUSE": "python-qt",
         "Fedora": "PyQt4",
         "Guix": "python2-pyqt@4.11.4",
-        "Gentoo": "dev-python/PyQt4"
+        "Gentoo": "dev-python/PyQt4",
+        'optional': True,
+        'description': "You only need PyQt if you want to use the GUI. " \
+            "When only running as a daemon, this can be skipped.\n" \
+            "However, you would have to install it manually " \
+            "because setuptools does not support PyQt."
     },
     "msgpack": {
         "OpenBSD": "py-msgpack",
@@ -49,10 +54,34 @@ packageName = {
         "Debian": "python-pyopencl",
         "Ubuntu": "python-pyopencl",
         "Fedora": "python2-pyopencl",
-        "Gentoo": "dev-python/pyopencl"
+        "openSUSE": "",
+        "OpenBSD": "",
+        "Guix": "",
+        "Gentoo": "dev-python/pyopencl",
+        "optional": True,
+        'description': "If you install pyopencl, you will be able to use " \
+            "GPU acceleration for proof of work. \n" \
+            "You also need a compatible GPU and drivers."
+    },
+    "setuptools": {
+        "OpenBSD": "py-setuptools",
+        "FreeBSD": "py27-setuptools",
+        "Debian": "python-setuptools",
+        "Ubuntu": "python-setuptools",
+        "Fedora": "python2-setuptools",
+        "openSUSE": "python-setuptools",
+        "Guix": "python2-setuptools",
+        "Gentoo": "",
     }
 }
 
+compiling = {
+        "Debian": "build-essential libssl-dev",
+        "Ubuntu": "build-essential libssl-dev",
+        "Fedora": "gcc-c++ redhat-rpm-config python-devel",
+        "openSUSE": "gcc-c++ libopenssl-devel python-devel",
+}
+
 
 def detectOS():
     if detectOS.result is not None:
@@ -87,27 +116,14 @@ def detectOS():
 
 def detectPrereqs(missing=False):
     available = []
+    for module in packageName.keys():
         try:
-        import_module("PyQt4.QtCore")
+            import_module(module)
             if not missing:
-            available.append("PyQt")
+                available.append(module)
         except ImportError:
             if missing:
-            available.append("PyQt")
-    try:
-        import_module("msgpack")
-        if not missing:
-            available.append("msgpack")
-    except ImportError:
-        if missing:
-            available.append("msgpack")
-    try:
-        import_module("pyopencl")
-        if not missing:
-            available.append("pyopencl")
-    except ImportError:
-        if missing:
-            available.append("pyopencl")
+                available.append(module)
     return available
 
 
@@ -116,27 +132,40 @@ def prereqToPackages():
     print "%s %s" % (
         packageManager[detectOS()], " ".join(
             packageName[x][detectOS()] for x in detectPrereqs(True)))
+    for package in detectPrereqs(True):
+        if packageName[package]['optional']:
+            print packageName[package]['description']
 
+def compilerToPackages():
+    if not detectOS() in compiling:
+        return
+    print "You can install the requirements by running, as root:"
+    print "%s %s" % (
+        packageManager[detectOS()], compiling[detectOS()])
 
 if __name__ == "__main__":
     detectOS.result = None
     detectPrereqs.result = None
-    if "PyQt" in detectPrereqs(True):
-        print "You only need PyQt if you want to use the GUI. " \
-            "When only running as a daemon, this can be skipped.\n" \
-            "However, you would have to install it manually " \
-            "because setuptools does not support pyqt."
     if detectPrereqs(True) != [] and detectOS() in packageManager:
         if detectOS() is not None:
             print "It looks like you're using %s. " \
                 "It is highly recommended to use the package manager " \
                 "instead of setuptools." % (detectOS())
             prereqToPackages()
+            for module in detectPrereqs(True):
+                if not packageName[module]['optional']:
                     sys.exit()
     if not haveSetuptools:
         print "It looks like you're missing setuptools."
         sys.exit()
 
+    if detectPrereqs(True) != []:
+        print "Press Return to continue"
+        try:
+            nothing = raw_input
+        except NameError:
+            pass
+
     here = os.path.abspath(os.path.dirname(__file__))
     with open(os.path.join(here, 'README.md')) as f:
         README = f.read()
@@ -147,6 +176,7 @@ if __name__ == "__main__":
         libraries=['pthread', 'crypto'],
     )
 
+    try:
         dist = setup(
             name='pybitmessage',
             version=softwareVersion,
@@ -193,3 +223,8 @@ if __name__ == "__main__":
             #},
             scripts=['src/pybitmessage']
         )
+    except SystemExit:
+        print "It looks like building the package failed.\n" \
+            "You may be missing a C++ compiler and the OpenSSL headers."
+        compilerToPackages()
+