Drop dependency on node.js for compiling coffeescript

.bzrignore

@@ -15,6 +15,7 @@ resources/scripts.pickle
 resources/ebook-convert-complete.pickle
 resources/builtin_recipes.xml
 resources/builtin_recipes.zip
+resources/coffee-script.js.bz2
 resources/template-functions.json
 resources/display/*.js
 setup/installer/windows/calibre/build.log

src/calibre/utils/coffeescript.py

@@ -10,15 +10,68 @@ __docformat__ = 'restructuredtext en'
 '''
 Utilities to help with developing coffeescript based apps
 '''
-import time, SimpleHTTPServer, SocketServer, os, subprocess
+import time, SimpleHTTPServer, SocketServer, os, bz2, sys
 from io import BytesIO
 
+from PyQt4.QtWebKit import QWebPage
+
+try:
+    from calibre.gui2 import must_use_qt
+    must_use_qt
+except ImportError:
+    import init_calibre
+    init_calibre
+    from calibre.gui2 import must_use_qt
+from calibre import force_unicode
+from calibre.gui2 import FunctionDispatcher
+
+must_use_qt()
+
+class Compiler(QWebPage): # {{{
+
+    def __init__(self):
+        QWebPage.__init__(self)
+        self.frame = self.mainFrame()
+        self.filename = self._src = ''
+        compiler = bz2.decompress(P('coffee-script.js.bz2', data=True))
+        self.frame.evaluateJavaScript(compiler)
+        self.frame.addToJavaScriptWindowObject("cs_compiler", self)
+        self.dispatcher = FunctionDispatcher(self.__evalcs, parent=self)
+        self.errors = []
+
+    def shouldInterruptJavaScript(self):
+        return True
+
+    def javaScriptConsoleMessage(self, msg, lineno, sourceid):
+        sourceid = sourceid or self.filename or '<script>'
+        self.errors.append('%s:%s'%(sourceid, msg))
+
+    def __evalcs(self, raw, filename=None):
+        # This method is NOT thread safe
+        self.filename = filename
+        self.setProperty('source', raw)
+        self.errors = []
+        res = self.frame.evaluateJavaScript('''
+            raw = document.getElementById("raw");
+            raw = cs_compiler.source;
+            CoffeeScript.compile(raw);
+        ''')
+        ans = ''
+        if res.type() == res.String:
+            ans = unicode(res.toString())
+        return ans, self.errors
+
+    def __call__(self, raw, filename=None):
+        raw = force_unicode(raw)
+        return self.dispatcher(raw, filename=filename)
+# }}}
+
 # FAVICON {{{
 FAVICON = \
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 # }}}
 
-class Handler(SimpleHTTPServer.SimpleHTTPRequestHandler):
+class Handler(SimpleHTTPServer.SimpleHTTPRequestHandler): # {{{
 
     special_resources = {}
     compiled_cs = {}
@@ -67,9 +120,12 @@ class Handler(SimpleHTTPServer.SimpleHTTPRequestHandler):
         raw, mtime = self.compiled_cs.get(src, (None, 0))
         if self.newer(src, mtime):
             mtime = time.time()
-            try:
-                raw = subprocess.check_output(['coffee', '-c', '-p', src])
-            except:
+            with open(src, 'rb') as f:
+                raw = f.read()
+            cs, errors = compile_coffeescript(raw)
+            for line in errors:
+                print(line, file=sys.stderr)
+            if not cs:
                 print('Compilation of %s failed'%src)
                 cs = '''
                 // Compilation of coffeescript failed
@@ -90,4 +146,24 @@ def serve(resources={}, port=8000):
         httpd.serve_forever()
     except KeyboardInterrupt:
         raise SystemExit(0)
+# }}}
 
+compile_coffeescript = Compiler()
+
+def main():
+    import argparse
+    parser = argparse.ArgumentParser(description=
+            'Compile coffeescript to javascript and print to stdout. Errors '
+            'and warnings are printed to stderr.')
+    parser.add_argument('src', type=argparse.FileType('rb'),
+            metavar='path/to/script.coffee', help='The coffee script to compile. Use '
+            ' - for stdin')
+    args = parser.parse_args()
+    ans, errors = compile_coffeescript(args.src.read(), filename=args.src.name)
+    for line in errors:
+        print(line, file=sys.stderr)
+    if ans:
+        print (ans.encode(sys.stdout.encoding or 'utf-8'))
+
+if __name__ == '__main__':
+    main()

src/calibre/utils/localization.py

@@ -8,7 +8,6 @@ __docformat__ = 'restructuredtext en'
 
 import os, locale, re, cStringIO, cPickle
 from gettext import GNUTranslations, NullTranslations
-from zipfile import ZipFile
 
 _available_translations = None
 
@@ -79,6 +78,7 @@ def set_translators():
             buf = cStringIO.StringIO(buf.getvalue())
 
         if mpath is not None:
+            from zipfile import ZipFile
             with ZipFile(P('localization/locales.zip',
                 allow_user_override=False), 'r') as zf:
                 if buf is None: