images in epub
[librarian.git] / librarian / pdf.py
index 41de1b3..9fb92b1 100644 (file)
@@ -3,26 +3,31 @@
 # This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
+"""PDF creation library.
+
+Creates one big XML from the book and its children, converts it to LaTeX
+with TeXML, then runs it by XeLaTeX.
+
+"""
 from __future__ import with_statement
 import os
 import os.path
 import shutil
 from StringIO import StringIO
-from tempfile import mkdtemp
+from tempfile import mkdtemp, NamedTemporaryFile
 import re
 from copy import deepcopy
 from subprocess import call, PIPE
 
-import sys
-
 from Texml.processor import process
 from lxml import etree
 from lxml.etree import XMLSyntaxError, XSLTApplyError
 
 from librarian.dcparser import Person
 from librarian.parser import WLDocument
-from librarian import ParseError, DCNS, get_resource
+from librarian import ParseError, DCNS, get_resource, OutputFile
 from librarian import functions
+from librarian.cover import WLCover
 
 
 functions.reg_substitute_entities()
@@ -35,9 +40,17 @@ STYLESHEETS = {
     'wl2tex': 'pdf/wl2tex.xslt',
 }
 
+#CUSTOMIZATIONS = [
+#    'nofootnotes',
+#    'nothemes',
+#    'defaultleading',
+#    'onehalfleading',
+#    'doubleleading',
+#    'nowlfont',
+#    ]
 
 def insert_tags(doc, split_re, tagname, exclude=None):
-    """ inserts <tagname> for every occurence of `split_re' in text nodes in the `doc' tree 
+    """ inserts <tagname> for every occurence of `split_re' in text nodes in the `doc' tree
 
     >>> t = etree.fromstring('<a><b>A-B-C</b>X-Y-Z</a>');
     >>> insert_tags(t, re.compile('-'), 'd');
@@ -67,7 +80,7 @@ def insert_tags(doc, split_re, tagname, exclude=None):
 
 
 def substitute_hyphens(doc):
-    insert_tags(doc, 
+    insert_tags(doc,
                 re.compile("(?<=[^-\s])-(?=[^-\s])"),
                 "dywiz",
                 exclude=[DCNS("identifier.url"), DCNS("rights.license")]
@@ -75,7 +88,7 @@ def substitute_hyphens(doc):
 
 
 def fix_hanging(doc):
-    insert_tags(doc, 
+    insert_tags(doc,
                 re.compile("(?<=\s\w)\s+"),
                 "nbsp",
                 exclude=[DCNS("identifier.url"), DCNS("rights.license")]
@@ -128,10 +141,16 @@ def hack_motifs(doc):
 
 
 def parse_creator(doc):
-    """ find all dc:creator and dc.contributor tags and add *_parsed versions with forenames first """
+    """Generates readable versions of creator and translator tags.
+
+    Finds all dc:creator and dc.contributor.translator tags
+    and adds *_parsed versions with forenames first.
+    """
     for person in doc.xpath("|".join('//dc:'+(tag) for tag in (
-                    'creator', 'contributor.translator', 'contributor.editor', 'contributor.technical_editor')),
+                    'creator', 'contributor.translator')),
                     namespaces = {'dc': str(DCNS)})[::-1]:
+        if not person.text:
+            continue
         p = Person.from_text(person.text)
         person_parsed = deepcopy(person)
         person_parsed.tag = person.tag + '_parsed'
@@ -145,12 +164,12 @@ def get_stylesheet(name):
 
 
 def package_available(package, args='', verbose=False):
-    """ check if a verion of a latex package accepting given args is available """  
+    """ check if a verion of a latex package accepting given args is available """
     tempdir = mkdtemp('-wl2pdf-test')
     fpath = os.path.join(tempdir, 'test.tex')
     f = open(fpath, 'w')
     f.write(r"""
-        \documentclass{book}
+        \documentclass{wl}
         \usepackage[%s]{%s}
         \begin{document}
         \end{document}
@@ -164,37 +183,54 @@ def package_available(package, args='', verbose=False):
     return p == 0
 
 
-def transform(provider, slug=None, file_path=None, 
-              output_file=None, output_dir=None, make_dir=False, verbose=False, save_tex=None, morefloats=None):
+def transform(wldoc, verbose=False, save_tex=None, morefloats=None,
+              cover=None, flags=None, customizations=None):
     """ produces a PDF file with XeLaTeX
 
-    provider: a DocProvider
-    slug: slug of file to process, available by provider
-    file_path can be provided instead of a slug
-    output_file: file-like object or path to output file
-    output_dir: path to directory to save output file to; either this or output_file must be present
-    make_dir: writes output to <output_dir>/<author>/<slug>.pdf istead of <output_dir>/<slug>.pdf
+    wldoc: a WLDocument
     verbose: prints all output from LaTeX
     save_tex: path to save the intermediary LaTeX file to
     morefloats (old/new/none): force specific morefloats
+    cover: a cover.Cover factory or True for default
+    flags: less-advertising,
+    customizations: user requested customizations regarding various formatting parameters (passed to wl LaTeX class)
     """
 
     # Parse XSLT
     try:
-        if file_path:
-            if slug:
-                raise ValueError('slug or file_path should be specified, not both')
-            document = load_including_children(provider, file_path=file_path)
-        else:
-            if not slug:
-                raise ValueError('either slug or file_path should be specified')
-            document = load_including_children(provider, slug=slug)
+        book_info = wldoc.book_info
+        document = load_including_children(wldoc)
+        root = document.edoc.getroot()
+
+        if cover:
+            if cover is True:
+                cover = WLCover
+            bound_cover = cover(book_info)
+            root.set('data-cover-width', str(bound_cover.width))
+            root.set('data-cover-height', str(bound_cover.height))
+            if bound_cover.uses_dc_cover:
+                if book_info.cover_by:
+                    root.set('data-cover-by', book_info.cover_by)
+                if book_info.cover_source:
+                    root.set('data-cover-source',
+                            book_info.cover_source)
+        if flags:
+            for flag in flags:
+                root.set('flag-' + flag, 'yes')
 
         # check for LaTeX packages
         if morefloats:
-            document.edoc.getroot().set('morefloats', morefloats.lower())
+            root.set('morefloats', morefloats.lower())
         elif package_available('morefloats', 'maxfloats=19'):
-            document.edoc.getroot().set('morefloats', 'new')
+            root.set('morefloats', 'new')
+
+        # add customizations
+        if customizations is not None:
+            root.set('customizations', u','.join(customizations))
+
+        # add editors info
+        root.set('editors', u', '.join(sorted(
+            editor.readable() for editor in document.editors())))
 
         # hack the tree
         move_motifs_inside(document.edoc)
@@ -203,19 +239,21 @@ def transform(provider, slug=None, file_path=None,
         substitute_hyphens(document.edoc)
         fix_hanging(document.edoc)
 
-        # find output dir
-        if make_dir and output_dir is not None:
-            author = unicode(document.book_info.author)
-            output_dir = os.path.join(output_dir, author)
-
         # wl -> TeXML
         style_filename = get_stylesheet("wl2tex")
         style = etree.parse(style_filename)
+
         texml = document.transform(style)
-        del document # no longer needed large object :)
 
         # TeXML -> LaTeX
         temp = mkdtemp('-wl2pdf')
+
+        if cover:
+            with open(os.path.join(temp, 'cover.png'), 'w') as f:
+                bound_cover.save(f)
+
+        del document # no longer needed large object :)
+
         tex_path = os.path.join(temp, 'doc.tex')
         fout = open(tex_path, 'w')
         process(StringIO(texml), fout, 'utf-8')
@@ -226,10 +264,13 @@ def transform(provider, slug=None, file_path=None,
             shutil.copy(tex_path, save_tex)
 
         # LaTeX -> PDF
-        shutil.copy(get_resource('pdf/wl.sty'), temp)
+        shutil.copy(get_resource('pdf/wl.cls'), temp)
         shutil.copy(get_resource('res/wl-logo.png'), temp)
 
-        cwd = os.getcwd()
+        try:
+            cwd = os.getcwd()
+        except OSError:
+            cwd = None
         os.chdir(temp)
 
         if verbose:
@@ -239,58 +280,42 @@ def transform(provider, slug=None, file_path=None,
         if p:
             raise ParseError("Error parsing .tex file")
 
-        os.chdir(cwd)
+        if cwd is not None:
+            os.chdir(cwd)
 
-        # save the PDF
+        output_file = NamedTemporaryFile(prefix='librarian', suffix='.pdf', delete=False)
         pdf_path = os.path.join(temp, 'doc.pdf')
-        if output_dir is not None:
-            try:
-                os.makedirs(output_dir)
-            except OSError:
-                pass
-            if slug:
-                output_path = os.path.join(output_dir, '%s.pdf' % slug)
-            else:
-                output_path = os.path.join(output_dir, os.path.splitext(os.path.basename(file_path))[0] + '.pdf')
-            shutil.move(pdf_path, output_path)
-        else:
-            if hasattr(output_file, 'write'):
-                # file-like object
-                with open(pdf_path) as f:
-                    output_file.write(f.read())
-                output_file.close()
-            else:
-                # path to output file
-                shutil.copy(pdf_path, output_file)
+        shutil.move(pdf_path, output_file.name)
         shutil.rmtree(temp)
+        return OutputFile.from_filename(output_file.name)
 
     except (XMLSyntaxError, XSLTApplyError), e:
         raise ParseError(e)
 
 
-def load_including_children(provider, slug=None, uri=None, file_path=None):
-    """ makes one big xml file with children inserted at end 
-    either slug or uri must be provided
+def load_including_children(wldoc=None, provider=None, uri=None):
+    """ Makes one big xml file with children inserted at end.
+    
+    Either wldoc or provider and URI must be provided.
     """
 
-    if uri:
+    if uri and provider:
         f = provider.by_uri(uri)
-    elif slug:
-        f = provider[slug]
-    elif file_path:
-        f = open(file_path, 'r')
+        text = f.read().decode('utf-8')
+        f.close()
+    elif wldoc is not None:
+        text = etree.tostring(wldoc.edoc, encoding=unicode)
+        provider = wldoc.provider
     else:
-        raise ValueError('Neither slug, URI nor file path provided for a book.')
+        raise ValueError('Neither a WLDocument, nor provider and URI were provided.')
 
-    text = f.read().decode('utf-8')
     text = re.sub(ur"([\u0400-\u04ff]+)", ur"<alien>\1</alien>", text)
 
-    document = WLDocument.from_string(text, True,
-        parse_dublincore=True)
+    document = WLDocument.from_string(text,
+                parse_dublincore=True, provider=provider)
+    document.swap_endlines()
 
-    f.close()
     for child_uri in document.book_info.parts:
-        print child_uri
-        child = load_including_children(provider, uri=child_uri)
+        child = load_including_children(provider=provider, uri=child_uri)
         document.edoc.getroot().append(child.edoc.getroot())
     return document