allow user specification of configuration

README.rst

@@ -101,9 +101,25 @@ You can also pass any options through meta tags in your HTML:
 
 	pdfkit.from_string(body, 'out.pdf') #with --page-size=Legal and --orientation=Landscape
 
+Configuration
+-------------
+
+Each API call takes an optional configuration paramater. This should be an instance of ``pdfkit.configuration.Configuration()`` - it takes the configuration options as initial paramaters. The available options are:
+
+* ``wkhtmltopdf`` - the location of the ``wkhtmltopdf`` binary. By default ``pdfkit`` will attempt to locate this using ``which`` (on UNIX type systems) or ``where`` (on Windows).
+* ``meta_tag_prefix`` - the prefix for ``pdfkit`` specific meta tags - by default this is ``pdfkit-``
+
+Example - for when ``wkhtmltopdf`` is not on ``$PATH``:
+
+.. code-block:: python
+
+    config = pdfkit.configuration.Configuration(wkhtmltopdf='/opt/bin/wkhtmltopdf'))
+    pdfkit.from_string(html_string, output_file, configuration=config)
+
+
 Troubleshooting
 ---------------
 
 - ``IOError: 'No wkhtmltopdf executable found'``:
 
-  Make sure that you have wkhtmltopdf in your PATH. *where wkhtmltopdf* in Windows or *which wkhtmltopdf* on Linux should return actual path to binary.
+  Make sure that you have wkhtmltopdf in your `$PATH` or set via custom configuration (see preceding section). *where wkhtmltopdf* in Windows or *which wkhtmltopdf* on Linux should return actual path to binary.

pdfkit/api.py

@@ -3,7 +3,7 @@
 from .pdfkit import PDFKit
 
 
-def from_url(url, output_path, options=None, toc=None, cover=None):
+def from_url(url, output_path, options=None, toc=None, cover=None, configuration=None):
 #TODO rework
     """
     Convert file of files from URLs to PDF document
@@ -13,14 +13,17 @@ def from_url(url, output_path, options=None, toc=None, cover=None):
     :param options: (optional) dict with wkhtmltopdf global and page options, with or w/o '--'
     :param toc: (optional) dict with toc-specific wkhtmltopdf options, with or w/o '--'
     :param cover: (optional) string with url/filename with a cover html page
+    :param configuration: (optional) instance of pdfkit.configuration.Configuration()
     """
 
-    r = PDFKit(url, 'url', options=options, toc=toc, cover=cover)
+    r = PDFKit(url, 'url', options=options, toc=toc, cover=cover,
+               configuration=configuration)
 
     r.to_file(output_path)
 
 
-def from_file(input, output_path, options=None, toc=None, cover=None, css=None):
+def from_file(input, output_path, options=None, toc=None, cover=None, css=None,
+              configuration=None):
     """
     Convert HTML file or files to PDF document
 
@@ -30,14 +33,17 @@ def from_file(input, output_path, options=None, toc=None, cover=None, css=None):
     :param toc: (optional) dict with toc-specific wkhtmltopdf options, with or w/o '--'
     :param cover: (optional) string with url/filename with a cover html page
     :param css: (optional) string with path to css file which will be added to a single input file
+    :param configuration: (optional) instance of pdfkit.configuration.Configuration()
     """
 
-    r = PDFKit(input, 'file', options=options, toc=toc, cover=cover, css=css)
+    r = PDFKit(input, 'file', options=options, toc=toc, cover=cover, css=css,
+               configuration=configuration)
 
     r.to_file(output_path)
 
 
-def from_string(input, output_path, options=None, toc=None, cover=None, css=None):
+def from_string(input, output_path, options=None, toc=None, cover=None, css=None,
+                configuration=None):
     """
     Convert given string or strings to PDF document
 
@@ -47,9 +53,10 @@ def from_string(input, output_path, options=None, toc=None, cover=None, css=None
     :param toc: (optional) dict with toc-specific wkhtmltopdf options, with or w/o '--'
     :param cover: (optional) string with url/filename with a cover html page
     :param css: (optional) string with path to css file which will be added to a input string
-
+    :param configuration: (optional) instance of pdfkit.configuration.Configuration()
     """
 
-    r = PDFKit(input, 'string', options=options, toc=toc, cover=cover, css=css)
+    r = PDFKit(input, 'string', options=options, toc=toc, cover=cover, css=css,
+               configuration=configuration)
 
-    r.to_file(output_path)
+    r.to_file(output_path)

pdfkit/configuration.py

@@ -4,10 +4,10 @@
 
 
 class Configuration(object):
-    def __init__(self):
-        self.meta_tag_prefix = 'pdfkit-'
+    def __init__(self, wkhtmltopdf='', meta_tag_prefix='pdfkit-'):
+        self.meta_tag_prefix = meta_tag_prefix
 
-        self.wkhtmltopdf = ''
+        self.wkhtmltopdf = wkhtmltopdf
 
         if not self.wkhtmltopdf:
             if sys.platform == 'win32':
@@ -21,6 +21,6 @@ def __init__(self):
             with open(self.wkhtmltopdf) as f:
                 pass
         except IOError:
-            raise IOError('No wkhtmltopdf executable found: %s\n'
+            raise IOError('No wkhtmltopdf executable found: "%s"\n'
                           'Please install wkhtmltopdf - '
                           'https://github.com/JazzCore/python-pdfkit/wiki/Installing-wkhtmltopdf' % self.wkhtmltopdf)

pdfkit/pdfkit.py

@@ -19,11 +19,15 @@ def __init__(self, msg):
         def __str__(self):
             return self.msg
 
-    def __init__(self, url_or_file, type_, options=None, toc=None, cover=None, css=None):
+    def __init__(self, url_or_file, type_, options=None, toc=None, cover=None,
+                 css=None, configuration=None):
         options = {} if options is None else options
         toc = {} if toc is None else toc
         self.source = Source(url_or_file, type_)
-        self.configuration = Configuration()
+        if configuration is None:
+            self.configuration = Configuration()
+        else:
+            self.configuration = configuration
         self.options = dict()
         self.stylesheets = []