Merge pull request #176 from patacrep/errors

Add an `errors` attribute to songs, compiling the song errors

Closes #121.

examples/example-test.sb

@@ -5,9 +5,10 @@
     "lilypond",
     "pictures"
   ],
+"lang": "ERROR",
 "booktype" : "chorded",
 "template" : "patacrep.tex",
 "encoding": "utf8",
- "content": ["tests/*.sg", "tests/*.sgc"]
+ "content": ["tests/*.csg", "tests/*.tsg"]
 
 }

examples/songs/tests/errors.csg

@@ -1,4 +1,4 @@
-{lang : en}
+{lang : xx_XX}
 {columns :  2}
 { title : Error}
 {subtitle: A chordpro file with many errors}
@@ -12,4 +12,5 @@ Bla [H]bla
 
 {fo#: bar}
 
-
+{image: foo}
+{partition: bar}

patacrep/build.py

@@ -31,7 +31,7 @@ GENERATED_EXTENSIONS = [
 
 
 # pylint: disable=too-few-public-methods
-class Songbook(object):
+class Songbook:
     """Represent a songbook (.sb) file.
 
     - Low level: provide a Python representation of the values stored in the
@@ -40,22 +40,24 @@ class Songbook(object):
     """
 
     def __init__(self, raw_songbook, basename):
-        super().__init__()
+        self._raw_config = raw_songbook
         self.config = raw_songbook
         self.basename = basename
+        self._errors = list()
+        self._config = dict()
         # Some special keys have their value processed.
         self._set_datadir()
 
     def _set_datadir(self):
         """Set the default values for datadir"""
         try:
-            if isinstance(self.config['datadir'], str):
-                self.config['datadir'] = [self.config['datadir']]
+            if isinstance(self._raw_config['datadir'], str):
+                self._raw_config['datadir'] = [self._raw_config['datadir']]
         except KeyError:  # No datadir in the raw_songbook
-            self.config['datadir'] = [os.path.abspath('.')]
+            self._raw_config['datadir'] = [os.path.abspath('.')]
 
         abs_datadir = []
-        for path in self.config['datadir']:
+        for path in self._raw_config['datadir']:
             if os.path.exists(path) and os.path.isdir(path):
                 abs_datadir.append(os.path.abspath(path))
             else:
@@ -63,10 +65,10 @@ class Songbook(object):
                     "Ignoring non-existent datadir '{}'.".format(path)
                     )
 
-        self.config['datadir'] = abs_datadir
-        self.config['_songdir'] = [
+        self._raw_config['datadir'] = abs_datadir
+        self._raw_config['_songdir'] = [
             DataSubpath(path, 'songs')
-            for path in self.config['datadir']
+            for path in self._raw_config['datadir']
             ]
 
     def write_tex(self, output):
@@ -76,42 +78,74 @@ class Songbook(object):
         - output: a file object, in which the file will be written.
         """
         # Updating configuration
-        config = DEFAULT_CONFIG.copy()
-        config.update(self.config)
+        self._config = DEFAULT_CONFIG.copy()
+        self._config.update(self._raw_config)
         renderer = TexBookRenderer(
-            config['template'],
-            config['datadir'],
-            config['lang'],
-            config['encoding'],
+            self._config['template'],
+            self._config['datadir'],
+            self._config['lang'],
+            self._config['encoding'],
             )
-        config.update(renderer.get_variables())
-        config.update(self.config)
+        self._config.update(renderer.get_variables())
+        self._config.update(self._raw_config)
 
-        config['_compiled_authwords'] = authors.compile_authwords(
-            copy.deepcopy(config['authwords'])
+        self._config['_compiled_authwords'] = authors.compile_authwords(
+            copy.deepcopy(self._config['authwords'])
             )
 
         # Loading custom plugins
-        config['_content_plugins'] = files.load_plugins(
-            datadirs=config.get('datadir', []),
+        self._config['_content_plugins'] = files.load_plugins(
+            datadirs=self._config.get('datadir', []),
             root_modules=['content'],
             keyword='CONTENT_PLUGINS',
             )
-        config['_song_plugins'] = files.load_plugins(
-            datadirs=config.get('datadir', []),
+        self._config['_song_plugins'] = files.load_plugins(
+            datadirs=self._config.get('datadir', []),
             root_modules=['songs'],
             keyword='SONG_RENDERERS',
             )['tsg']
 
         # Configuration set
-        config['render'] = content.render
-        config['content'] = content.process_content(
-            config.get('content', []),
-            config,
+        self._config['render'] = content.render
+        self._config['content'] = content.process_content(
+            self._config.get('content', []),
+            self._config,
             )
-        config['filename'] = output.name[:-4]
+        self._config['filename'] = output.name[:-4]
 
-        renderer.render_tex(output, config)
+        renderer.render_tex(output, self._config)
+        self._errors.extend(renderer.errors)
+
+    def has_errors(self):
+        """Return `True` iff errors have been encountered in the book.
+
+        Note that `foo.has_errors() == False` does not means that the book has
+        not any errors: it does only mean that no error has been found yet.
+        """
+        for _ in self.iter_errors():
+            return True
+        return False
+
+    def iter_errors(self):
+        """Iterate over errors of book and book content."""
+        yield from self._errors
+        contentlist = self._config.get('content', content.ContentList())
+        yield from contentlist.iter_errors()
+
+    def iter_flat_errors(self):
+        """Iterate over errors, in an exportable format.
+
+        This function does the same job as :func:`iter_errors`, exepted that
+        the errors are represented as dictionaries of standard python types.
+
+        Each error (dictionary) contains the following keys:
+        - `type`: the error type (as the class name of the error);
+        - `message`: Error message, that does not include the error location (datadir, song, etc.);
+        - `full_message`: Error message, containing the full error location;
+        - depending on the error type, more keys may be present in the error.
+        """
+        for error in self.iter_errors():
+            yield vars(error)
 
     def requires_lilypond(self):
         """Tell if lilypond is part of the bookoptions"""
@@ -125,7 +159,7 @@ def _log_pipe(pipe):
             break
         LOGGER.debug(line.strip())
 
-class SongbookBuilder(object):
+class SongbookBuilder:
     """Provide methods to compile a songbook."""
 
     # if False, do not expect anything from stdin.

patacrep/content/__init__.py

@@ -3,8 +3,8 @@
 Content that can be included in a songbook is controlled by plugins. From the
 user (or .sb file) point of view, each piece of content is introduced by a
 keyword. This keywold is associated with a plugin (a submodule of this very
-module), which parses the content, and return a list of instances of the
-Content class.
+module), which parses the content, and return a ContentList object, which is
+little more than a list of instances of the ContentItem class.
 
 # Plugin definition
 
@@ -27,8 +27,8 @@ A parser is a function which takes as arguments:
     - config: the configuration object of the current songbook. Plugins can
       change it.
 
-A parser returns a list of instances of the Content class, defined in
-this module (or of subclasses of this class).
+A parser returns a ContentList object (a list of instances of the ContentItem
+class), defined in this module (or of subclasses of this class).
 
 Example: When the following piece of content is met
 
@@ -55,13 +55,13 @@ surrounded by parenthesis. It is up to the plugin to parse this argument. For
 intance, keyword "foo()(( bar()" is a perfectly valid keyword, and the parser
 associated to "foo" will get as argument the string ")(( bar(".
 
-# Content class
+# ContentItem class
 
-The content classes are subclasses of class Content defined in this module.
-Content is a perfectly valid class, but instances of it will not generate
+The content classes are subclasses of class ContentItem defined in this module.
+ContentItem is a perfectly valid class, but instances of it will not generate
 anything in the resulting .tex.
 
-More documentation in the docstring of Content.
+More documentation in the docstring of ContentItem.
 
 """
 
@@ -74,13 +74,13 @@ import sys
 import jinja2
 
 from patacrep import files
-from patacrep.errors import SongbookError
+from patacrep.errors import SharedError
 
 LOGGER = logging.getLogger(__name__)
 EOL = '\n'
 
 #pylint: disable=no-self-use
-class Content(object):
+class ContentItem:
     """Content item. Will render to something in the .tex file.
 
     The current jinja2.runtime.Context is passed to all function defined
@@ -101,8 +101,8 @@ class Content(object):
 
         # Arguments
 
-        - __previous: the songbook.content.Content object of the previous item.
-        - __context: see Content() documentation.
+        - __previous: the songbook.content.ContentItem object of the previous item.
+        - __context: see ContentItem() documentation.
 
         # Return
 
@@ -121,15 +121,81 @@ class Content(object):
         """Return the string to end a block."""
         return ""
 
-class ContentError(SongbookError):
+class ContentError(SharedError):
     """Error in a content plugin."""
-    def __init__(self, keyword, message):
+    def __init__(self, keyword=None, message=None):
         super().__init__()
         self.keyword = keyword
         self.message = message
 
     def __str__(self):
-        return "Content: {}: {}".format(self.keyword, self.message)
+        text = "Content"
+        if self.keyword is not None:
+            text += ": " + self.keyword
+        if self.message is not None:
+            text += ": " + self.message
+        return text
+
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        parent.update({
+            'keyword': self.keyword,
+            'message': self.message,
+            })
+        return parent
+
+class ContentList:
+    """List of content items"""
+
+    def __init__(self, *args, **kwargs):
+        self._content = list(*args, **kwargs)
+        self._errors = []
+
+    def __iter__(self):
+        yield from self._content
+
+    def extend(self, iterator):
+        """Extend content list with an iterator.
+
+        If the argument is of the same type, the list of errors is
+        also extended.
+        """
+        self._content.extend(iterator)
+        if isinstance(iterator, ContentList):
+            self._errors.extend(iterator.iter_errors())
+
+    def append(self, item):
+        """Append an item to the content list."""
+        return self._content.append(item)
+
+    def __len__(self):
+        return len(self._content)
+
+    def append_error(self, error):
+        """Log and append an error to the error list."""
+        LOGGER.warning(error)
+        self._errors.append(error)
+
+    def extend_error(self, errors):
+        """Extend the error list with the argument, which is logged."""
+        for error in errors:
+            self.append_error(error)
+
+    def iter_errors(self):
+        """Iterate over errors."""
+        yield from self._errors
+        for item in self:
+            if not hasattr(item, "iter_errors"):
+                continue
+            yield from item.iter_errors()
+
+class EmptyContentList(ContentList):
+    """Empty content list: contain only errors."""
+    def __init__(self, *, errors):
+        super().__init__()
+        for error in errors:
+            self.append_error(error)
 
 @jinja2.contextfunction
 def render(context, content):
@@ -138,15 +204,15 @@ def render(context, content):
     Arguments:
     - context: the jinja2.runtime.context of the current template
       compilation.
-    - content: a list of Content() instances, as the one that was returned by
+    - content: a list of ContentItem() instances, as the one that was returned by
       process_content().
     """
     rendered = ""
     previous = None
     last = None
     for elem in content:
-        if not isinstance(elem, Content):
-            LOGGER.error("Ignoring bad content item '{}'.".format(elem))
+        if not isinstance(elem, ContentItem):
+            LOGGER.warning("Ignoring bad content item '{}'.".format(elem))
             continue
 
         last = elem
@@ -157,23 +223,23 @@ def render(context, content):
         rendered += elem.render(context) + EOL
         previous = elem
 
-    if isinstance(last, Content):
+    if last is not None:
         rendered += last.end_block(context) + EOL
 
     return rendered
 
 def process_content(content, config=None):
-    """Process content, and return a list of Content() objects.
+    """Process content, and return a list of ContentItem() objects.
 
     Arguments are:
     - content: the content field of the .sb file, which should be a list, and
       describe what is to be included in the songbook;
     - config: the configuration dictionary of the current songbook.
 
-    Return: a list of Content objects, corresponding to the content to be
+    Return: a list of ContentItem objects, corresponding to the content to be
     included in the .tex file.
     """
-    contentlist = []
+    contentlist = ContentList()
     plugins = config.get('_content_plugins', {})
     keyword_re = re.compile(r'^ *(?P<keyword>[\w\*]*) *(\((?P<argument>.*)\))? *$')
     if not content:
@@ -184,10 +250,12 @@ def process_content(content, config=None):
         try:
             match = keyword_re.match(elem[0]).groupdict()
         except AttributeError:
-            raise ContentError(elem[0], "Cannot parse content type.")
+            contentlist.append_error(ContentError(elem[0], "Cannot parse content type."))
+            continue
         (keyword, argument) = (match['keyword'], match['argument'])
         if keyword not in plugins:
-            raise ContentError(keyword, "Unknown content type.")
+            contentlist.append_error(ContentError(keyword, "Unknown content type."))
+            continue
         contentlist.extend(plugins[keyword](
             keyword,
             argument=argument,

patacrep/content/cwd.py

@@ -24,7 +24,7 @@ def parse(keyword, config, argument, contentlist):
     """
     old_songdir = config['_songdir']
     config['_songdir'] = (
-        [DataSubpath("", argument)] +
+        [DataSubpath(".", argument)] +
         [path.clone().join(argument) for path in config['_songdir']]
         )
     processed_content = process_content(contentlist, config)

patacrep/content/include.py

@@ -6,10 +6,9 @@ songs in JSON format.
 
 import json
 import os
-import sys
 import logging
 
-from patacrep.content import process_content, ContentError
+from patacrep.content import process_content, ContentError, ContentList
 from patacrep import encoding, errors, files
 
 LOGGER = logging.getLogger(__name__)
@@ -19,7 +18,7 @@ def load_from_datadirs(path, datadirs):
 
     Raise an exception if it was found if none of the datadirs of 'config'.
     """
-    for filepath in files.iter_datadirs(datadirs, path):
+    for filepath in files.iter_datadirs(datadirs, "songs", path):
         if os.path.exists(filepath):
             return filepath
     # File not found
@@ -38,10 +37,14 @@ def parse(keyword, config, argument, contentlist):
         - argument: None;
         - contentlist: a list of file paths to be included.
     """
-    new_contentlist = []
+    new_contentlist = ContentList()
 
     for path in contentlist:
-        filepath = load_from_datadirs(path, config.get('datadir', []))
+        try:
+            filepath = load_from_datadirs(path, config.get('datadir', []))
+        except ContentError as error:
+            new_contentlist.append_error(error)
+            continue
         content_file = None
         try:
             with encoding.open_read(
@@ -50,12 +53,14 @@ def parse(keyword, config, argument, contentlist):
                 ) as content_file:
                 new_content = json.load(content_file)
         except Exception as error: # pylint: disable=broad-except
-            LOGGER.error(error)
-            LOGGER.error("Error while loading file '{}'.".format(filepath))
-            sys.exit(1)
+            new_contentlist.append_error(ContentError(
+                keyword="include",
+                message="Error while loading file '{}': {}".format(filepath, error),
+                ))
+            continue
 
         config["datadir"].append(os.path.abspath(os.path.dirname(filepath)))
-        new_contentlist += process_content(new_content, config)
+        new_contentlist.extend(process_content(new_content, config))
         config["datadir"].pop()
 
     return new_contentlist

patacrep/content/section.py

@@ -1,6 +1,6 @@
 """Allow LaTeX sections (starred or not) as content of a songbook."""
 
-from patacrep.content import Content, ContentError
+from patacrep.content import ContentItem, ContentError, ContentList, EmptyContentList
 
 KEYWORDS = [
     "part",
@@ -13,7 +13,7 @@ KEYWORDS = [
     ]
 FULL_KEYWORDS = KEYWORDS + ["{}*".format(word) for word in KEYWORDS]
 
-class Section(Content):
+class Section(ContentItem):
     """A LaTeX section."""
     # pylint: disable=too-few-public-methods
 
@@ -41,14 +41,17 @@ def parse(keyword, argument, contentlist, config):
       and short) of the section;
     - config: configuration dictionary of the current songbook.
     """
-    if (keyword not in KEYWORDS) and (len(contentlist) != 1):
-        raise ContentError(
-            keyword,
-            "Starred section names must have exactly one argument."
-            )
-    if (len(contentlist) not in [1, 2]):
-        raise ContentError(keyword, "Section can have one or two arguments.")
-    return [Section(keyword, *contentlist)]
+    try:
+        if (keyword not in KEYWORDS) and (len(contentlist) != 1):
+            raise ContentError(
+                keyword,
+                "Starred section names must have exactly one argument."
+                )
+        if (len(contentlist) not in [1, 2]):
+            raise ContentError(keyword, "Section can have one or two arguments.")
+        return ContentList([Section(keyword, *contentlist)])
+    except ContentError as error:
+        return EmptyContentList(errors=[error])
 
 
 CONTENT_PLUGINS = dict([

patacrep/content/song.py

@@ -7,18 +7,23 @@ import textwrap
 
 import jinja2
 
-from patacrep.content import process_content, ContentError, Content
+from patacrep.content import process_content
+from patacrep.content import ContentError, ContentItem, ContentList
 from patacrep import files, errors
 
 LOGGER = logging.getLogger(__name__)
 
-class SongRenderer(Content):
+class SongRenderer(ContentItem):
     """Render a song in as a tex code."""
 
     def __init__(self, song):
         super().__init__()
         self.song = song
 
+    def iter_errors(self):
+        """Iterate over song errors."""
+        yield from self.song.errors
+
     def begin_new_block(self, previous, __context):
         """Return a boolean stating if a new block is to be created."""
         return not isinstance(previous, SongRenderer)
@@ -68,7 +73,7 @@ def parse(keyword, argument, contentlist, config):
     plugins = config['_song_plugins']
     if '_langs' not in config:
         config['_langs'] = set()
-    songlist = []
+    songlist = ContentList()
     for songdir in config['_songdir']:
         if contentlist:
             break
@@ -85,20 +90,24 @@ def parse(keyword, argument, contentlist, config):
                     LOGGER.debug('Parsing file "{}"…'.format(filename))
                     extension = filename.split(".")[-1]
                     if extension not in plugins:
-                        LOGGER.warning(
+                        LOGGER.info(
                             (
-                                'I do not know how to parse "{}": name does '
-                                'not end with one of {}. Ignored.'
-                            ).format(
-                                os.path.join(songdir.datadir, filename),
-                                ", ".join(["'.{}'".format(key) for key in plugins.keys()]),
-                                ))
+                                'Cannot parse "%s": name does not end with one '
+                                'of %s. Ignored.'
+                            ),
+                            os.path.join(songdir.datadir, filename),
+                            ", ".join(["'.{}'".format(key) for key in plugins.keys()])
+                        )
+                        continue
+                    try:
+                        renderer = SongRenderer(plugins[extension](
+                            filename,
+                            config,
+                            datadir=songdir.datadir,
+                            ))
+                    except ContentError as error:
+                        songlist.append_error(error)
                         continue
-                    renderer = SongRenderer(plugins[extension](
-                        filename,
-                        config,
-                        datadir=songdir.datadir,
-                        ))
                     songlist.append(renderer)
                     config["_langs"].add(renderer.song.lang)
             if len(songlist) > before:

patacrep/content/songsection.py

@@ -1,13 +1,13 @@
 """Allow 'songchapter' and 'songsection' as content of a songbook."""
 
-from patacrep.content import Content, ContentError
+from patacrep.content import ContentItem, ContentError, ContentList, EmptyContentList
 
 KEYWORDS = [
     "songchapter",
     "songsection",
     ]
 
-class SongSection(Content):
+class SongSection(ContentItem):
     """A songsection or songchapter."""
     # pylint: disable=too-few-public-methods
 
@@ -29,16 +29,19 @@ def parse(keyword, argument, contentlist, config):
     - contentlist: a list of one string, which is the name of the section;
     - config: configuration dictionary of the current songbook.
     """
-    if (keyword not in KEYWORDS) and (len(contentlist) != 1):
-        raise ContentError(
-            keyword,
-            "Starred section names must have exactly one argument.",
-            )
-    return [SongSection(keyword, contentlist[0])]
+    try:
+        if (keyword not in KEYWORDS) and (len(contentlist) != 1):
+            raise ContentError(
+                keyword,
+                "Starred section names must have exactly one argument.",
+                )
+        return ContentList([SongSection(keyword, contentlist[0])])
+    except ContentError as error:
+        return EmptyContentList(errors=[error])
 
 
 CONTENT_PLUGINS = dict([
-    (word, parse)
-    for word
+    (keyword, parse)
+    for keyword
     in KEYWORDS
     ])

patacrep/content/sorted.py

@@ -9,7 +9,8 @@ import logging
 import unidecode
 
 from patacrep import files
-from patacrep.content import ContentError, process_content
+from patacrep.content import ContentError, EmptyContentList
+from patacrep.content import process_content
 from patacrep.content.song import OnlySongsError
 
 LOGGER = logging.getLogger(__name__)
@@ -85,11 +86,11 @@ def parse(keyword, config, argument, contentlist):
     try:
         songlist = process_content(contentlist, config)
     except OnlySongsError as error:
-        raise ContentError(keyword, (
+        return EmptyContentList(errors=[ContentError(keyword, (
             "Content list of this keyword can be only songs (or content "
             "that result into songs), and the following are not:" +
             str(error.not_songs)
-            ))
+            ))])
     return sorted(songlist, key=key_generator(sort))
 
 CONTENT_PLUGINS = {'sorted': parse}

patacrep/content/tex.py

@@ -5,11 +5,11 @@ import logging
 import os
 
 from patacrep import files, errors
-from patacrep.content import Content
+from patacrep.content import ContentItem, ContentList, ContentError
 
 LOGGER = logging.getLogger(__name__)
 
-class LaTeX(Content):
+class LaTeX(ContentItem):
     """Inclusion of LaTeX code"""
 
     def __init__(self, filename):
@@ -35,7 +35,7 @@ def parse(keyword, argument, contentlist, config):
         LOGGER.warning(
             "Useless 'tex' content: list of files to include is empty."
             )
-    filelist = []
+    filelist = ContentList()
     basefolders = itertools.chain(
         (path.fullpath for path in config['_songdir']),
         files.iter_datadirs(config['datadir']),
@@ -51,11 +51,12 @@ def parse(keyword, argument, contentlist, config):
                     ))
                 break
         if not checked_file:
-            LOGGER.warning(
-                "{} Compilation may fail later.".format(
-                    errors.notfound(filename, basefolders)
+            filelist.append_error(
+                ContentError(
+                    keyword="tex",
+                    message=errors.notfound(filename, basefolders),
+                    )
                 )
-            )
             continue
         filelist.append(LaTeX(checked_file))
 

patacrep/errors.py

@@ -104,6 +104,20 @@ class ParsingError(SongbookError):
     def __str__(self):
         return self.message
 
+class SharedError(SongbookError):
+    """Error that is meant to be shared to third party tools using patacrep."""
+
+    def __str__(self):
+        raise NotImplementedError()
+
+    @property
+    def __dict__(self):
+        return {
+            'type': self.__class__.__name__,
+            'message': str(self),
+            'full_message': str(self),
+            }
+
 def notfound(filename, paths, message=None):
     """Return a string saying that file was not found in paths."""
     if message is None:

patacrep/index.py

@@ -46,7 +46,7 @@ def process_sxd(filename):
     return idx
 
 
-class Index(object):
+class Index:
     """Title, author or scripture Index representation."""
 
     def __init__(self, indextype):

patacrep/latex/__init__.py

@@ -8,10 +8,13 @@ will work on simple cases, but not on complex ones.
 import logging
 from collections import OrderedDict
 
+from patacrep import errors
 from patacrep.latex.syntax import tex2plain, parse_song
 
 LOGGER = logging.getLogger(__name__)
 
+DEFAULT_LANGUAGE = "en_us"
+
 BABEL_LANGUAGES = OrderedDict((
     ('de_de', 'german'),
     ('de_at', 'austrian'),
@@ -77,32 +80,76 @@ BABEL_LANGUAGES = OrderedDict((
     # ('??_??', 'welsh'),
 ))
 
-def lang2babel(lang):
-    """Return the language used by babel, corresponding to the language code"""
+class UnknownLanguage(errors.SharedError):
+    """Error: Unknown language."""
+
+    def __init__(self, *, original, fallback, message):
+        super().__init__()
+        self.original = original
+        self.fallback = fallback
+        self.message = message
+
+    @property
+    def babel(self):
+        """Return the fallback babel language."""
+        return BABEL_LANGUAGES[self.fallback]
+
+    def __str__(self):
+        return self.message
+
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        parent.update({
+            'fallback': self.fallback,
+            'original': self.original,
+            })
+        return parent
+
+def checklanguage(lang):
+    """Check that `lang` is a known language.
+
+    Raise an :class:`UnknownLanguage` exception if not.
+    """
     # Exact match
     if lang.lower() in BABEL_LANGUAGES:
-        return BABEL_LANGUAGES[lang.lower()]
+        return lang.lower()
     # Only language code is provided (e.g. 'fr')
     for babel in BABEL_LANGUAGES:
         if babel.startswith(lang.lower()):
-            return BABEL_LANGUAGES[babel]
+            return babel
     # A non existent country code is provided (e.g. 'fr_CD').
     language = lang.lower().split("_")[0]
     for babel in BABEL_LANGUAGES:
         if babel.startswith(language):
-            LOGGER.error(
-                "Unknown country code '{}'. Using default '{}' instead.".format(
+            raise UnknownLanguage(
+                original=lang,
+                fallback=babel,
+                message="Unknown country code '{}'. Using default '{}' instead.".format(
                     lang,
                     babel
                 )
             )
-            return BABEL_LANGUAGES[babel]
     # Error: no (exact or approximate) match found
     available = ", ".join(BABEL_LANGUAGES.keys())
-    LOGGER.error(
-        "Unknown language code '{}' (supported: {}). Using default 'english' instead.".format(
-            lang,
-            available
-        )
+    raise UnknownLanguage(
+        original=lang,
+        fallback=DEFAULT_LANGUAGE,
+        message=(
+            "Unknown language code '{}' (supported: {}). Using "
+            "default '{}' instead."
+            ).format(
+                lang,
+                available,
+                DEFAULT_LANGUAGE,
+            )
     )
-    return 'english'
+
+def lang2babel(lang):
+    """Return the language used by babel, corresponding to the language code
+
+    Raises an `UnknownLanguage` exception if the `lang` argument is not known,
+    the :attr:`fallback` attribute of the exception being the existing
+    alternative language that can be used instead.
+    """
+    return BABEL_LANGUAGES[checklanguage(lang)]

patacrep/latex/lexer.py

@@ -72,7 +72,7 @@ class SimpleLexer:
     @staticmethod
     def t_error(token):
         """Manage errors"""
-        LOGGER.error("Illegal character '{}'".format(token.value[0]))
+        LOGGER.warning("Illegal character '{}'".format(token.value[0]))
         token.lexer.skip(1)
 
 class SongLexer(SimpleLexer):

patacrep/latex/syntax.py

@@ -3,11 +3,10 @@
 import logging
 import ply.yacc as yacc
 
-from patacrep.songs.syntax import Parser
-from patacrep.latex.lexer import tokens, SimpleLexer, SongLexer
 from patacrep.latex import ast
-from patacrep.errors import ParsingError
 from patacrep.latex.detex import detex
+from patacrep.latex.lexer import tokens, SimpleLexer, SongLexer
+from patacrep.songs.syntax import Parser
 
 LOGGER = logging.getLogger()
 
@@ -126,20 +125,22 @@ class LatexParser(Parser):
         else:
             symbols[0] = []
 
-    @staticmethod
-    def p_dictionary(symbols):
+    def p_dictionary(self, symbols):
         """dictionary : identifier EQUAL braces dictionary_next
                       | identifier EQUAL error dictionary_next
                       | empty
         """
+        symbols[0] = {}
         if len(symbols) == 2:
-            symbols[0] = {}
+            pass
         elif isinstance(symbols[3], ast.Expression):
-            symbols[0] = {}
             symbols[0][symbols[1]] = symbols[3]
             symbols[0].update(symbols[4])
         else:
-            raise ParsingError("Do enclose arguments between braces.")
+            self.error(
+                line=symbols.lexer.lineno,
+                message="Argument '{}' should be enclosed between braces.".format(symbols[1]),
+                )
 
     @staticmethod
     def p_identifier(symbols):

patacrep/songs/__init__.py

@@ -7,8 +7,10 @@ import os
 import pickle
 import re
 
+from patacrep import errors as book_errors
 from patacrep import files, encoding
 from patacrep.authors import process_listauthors
+from patacrep.songs import errors as song_errors
 
 LOGGER = logging.getLogger(__name__)
 
@@ -34,7 +36,7 @@ def cached_name(datadir, filename):
             raise
     return fullpath
 
-class DataSubpath(object):
+class DataSubpath:
     """A path divided in two path: a datadir, and its subpath.
 
     - This object can represent either a file or directory.
@@ -88,7 +90,7 @@ class Song:
 
     # Version format of cached song. Increment this number if we update
     # information stored in cache.
-    CACHE_VERSION = 3
+    CACHE_VERSION = 4
 
     # List of attributes to cache
     cached_attributes = [
@@ -96,6 +98,7 @@ class Song:
         "unprefixed_titles",
         "cached",
         "data",
+        "errors",
         "lang",
         "authors",
         "_filehash",
@@ -118,8 +121,9 @@ class Song:
         self.subpath = subpath
         self._filehash = None
         self.encoding = config["encoding"]
-        self.default_lang = config["lang"]
+        self.lang = config["lang"]
         self.config = config
+        self.errors = []
 
         if self._cache_retrieved():
             return
@@ -127,8 +131,7 @@ class Song:
         # Data extraction from the latex song
         self.titles = []
         self.data = {}
-        self.cached = None
-        self.lang = None
+        self.cached = {}
         self._parse()
 
         # Post processing of data
@@ -183,16 +186,22 @@ class Song:
 
     def _write_cache(self):
         """If relevant, write a dumbed down version of self to the cache."""
-        if self.use_cache:
-            cached = {attr: getattr(self, attr) for attr in self.cached_attributes}
-            pickle.dump(
-                cached,
-                open(self.cached_name, 'wb'),
-                protocol=-1
-                )
+        if not self.use_cache:
+            return
+        if self.errors:
+            # As errors are exceptions, we cannot cache them because of a Python
+            # bug. When this bug is fixed, we will cache errors.
+            # https://bugs.python.org/issue1692335
+            return
+        cached = {attr: getattr(self, attr) for attr in self.cached_attributes}
+        pickle.dump(
+            cached,
+            open(self.cached_name, 'wb'),
+            protocol=-1
+            )
 
-    def __repr__(self):
-        return repr((self.titles, self.data, self.fullpath))
+    def __str__(self):
+        return str(self.fullpath)
 
     def render(self, *args, **kwargs):
         """Return the code rendering this song.

patacrep/songs/chordpro/__init__.py

@@ -4,15 +4,16 @@ import logging
 import operator
 import os
 
-from jinja2 import Environment, FileSystemLoader, contextfunction, ChoiceLoader
+from jinja2 import Environment, FileSystemLoader, ChoiceLoader
+from jinja2 import contextfunction
 import jinja2
 
 from patacrep import encoding, files, pkg_datapath
 from patacrep.songs import Song
 from patacrep.songs.chordpro.syntax import parse_song
+from patacrep.songs.errors import FileNotFound, SongUnknownLanguage
 from patacrep.templates import Renderer
-from patacrep.latex import lang2babel
-from patacrep.files import path2posix
+from patacrep.latex import lang2babel, UnknownLanguage
 
 LOGGER = logging.getLogger(__name__)
 
@@ -20,6 +21,10 @@ def sort_directive_argument(directives):
     """Sort directives by their argument."""
     return sorted(directives, key=operator.attrgetter("argument"))
 
+DEFAULT_FILTERS = {
+    'sortargs': sort_directive_argument,
+    }
+
 class ChordproSong(Song):
     """Chordpro song parser"""
     # pylint: disable=abstract-method
@@ -32,12 +37,22 @@ class ChordproSong(Song):
             song = parse_song(song.read(), self.fullpath)
         self.authors = song.authors
         self.titles = song.titles
-        self.lang = song.get_data_argument('language', self.default_lang)
+        self.lang = song.get_data_argument('language', self.lang)
         self.data = song.meta
+        self.errors = [error(song=self) for error in song.error_builders]
         self.cached = {
             'song': song,
             }
 
+    def _filters(self):
+        """Return additional jinja2 filters."""
+        filters = DEFAULT_FILTERS.copy()
+        filters.update({
+            'search_image': self.search_image,
+            'search_partition': self.search_partition,
+        })
+        return filters
+
     def render(self, template="song"): # pylint: disable=arguments-differ
         context = {
             'lang': self.lang,
@@ -51,11 +66,7 @@ class ChordproSong(Song):
         jinjaenv = Environment(loader=FileSystemLoader(
             self.iter_datadirs("templates", "songs", "chordpro", self.output_language)
             ))
-        jinjaenv.filters['search_image'] = self.search_image
-        jinjaenv.filters['search_partition'] = self.search_partition
-        jinjaenv.filters['lang2babel'] = lang2babel
-        jinjaenv.filters['sortargs'] = sort_directive_argument
-        jinjaenv.filters['path2posix'] = path2posix
+        jinjaenv.filters.update(self._filters())
 
         try:
             return Renderer(
@@ -106,22 +117,49 @@ class Chordpro2LatexSong(ChordproSong):
         try:
             return os.path.join("scores", super().search_partition(filename))
         except FileNotFoundError:
-            LOGGER.warning(
-                "Song '%s' (datadir '%s'): Score '%s' not found.",
-                self.subpath, self.datadir, filename,
+            message = "Song '{}' (datadir '{}'): Score '{}' not found.".format(
+                self.subpath, self.datadir, filename
                 )
+            self.errors.append(FileNotFound(self, filename))
+            LOGGER.warning(message)
             return None
 
     def search_image(self, filename):
         try:
             return os.path.join("img", super().search_image(filename))
         except FileNotFoundError:
-            LOGGER.warning(
-                "Song '%s' (datadir '%s'): Image '%s' not found.",
-                self.subpath, self.datadir, filename,
+            message = "Song '{}' (datadir '{}'): Image '{}' not found.".format(
+                self.subpath, self.datadir, filename
                 )
+            self.errors.append(FileNotFound(self, filename))
+            LOGGER.warning(message)
             return None
 
+    def _filters(self):
+        parent = super()._filters()
+        parent.update({
+            'lang2babel': self.lang2babel,
+            })
+        return parent
+
+    def lang2babel(self, lang):
+        """Return the LaTeX babel code corresponding to `lang`.
+
+        Add an error to the list of errors if argument is invalid.
+        """
+        try:
+            return lang2babel(lang)
+        except UnknownLanguage as error:
+            new_error = SongUnknownLanguage(
+                self,
+                error.original,
+                error.fallback,
+                error.message,
+                )
+            LOGGER.warning(new_error)
+            self.errors.append(new_error)
+            return error.babel
+
 class Chordpro2ChordproSong(ChordproSong):
     """Render chordpro song to chordpro code"""
 

patacrep/songs/chordpro/ast.py

@@ -3,8 +3,11 @@
 # pylint: disable=too-few-public-methods
 
 from collections import OrderedDict
+import functools
 import logging
 
+from patacrep.songs import errors
+
 LOGGER = logging.getLogger()
 
 def _indent(string):
@@ -223,7 +226,7 @@ class Song(AST):
         "tag": "add_cumulative",
         }
 
-    def __init__(self, filename, directives):
+    def __init__(self, filename, directives, *, error_builders=None):
         super().__init__()
         self.content = []
         self.meta = OrderedDict()
@@ -231,6 +234,10 @@ class Song(AST):
         self._titles = []
         self._subtitles = []
         self.filename = filename
+        if error_builders is None:
+            self.error_builders = []
+        else:
+            self.error_builders = error_builders
         for directive in directives:
             self.add(directive)
 
@@ -261,7 +268,13 @@ class Song(AST):
             # Add a metadata directive. Some of them are added using special
             # methods listed in ``METADATA_ADD``.
             if data.keyword not in AVAILABLE_DIRECTIVES:
-                LOGGER.warning("Ignoring unknown directive '{}'.".format(data.keyword))
+                message = "Ignoring unknown directive '{}'.".format(data.keyword)
+                LOGGER.warning("Song {}, line {}: {}".format(self.filename, data.lineno, message))
+                self.error_builders.append(functools.partial(
+                    errors.SongSyntaxError,
+                    line=data.lineno,
+                    message=message,
+                    ))
             if data.keyword in self.METADATA_ADD:
                 getattr(self, self.METADATA_ADD[data.keyword])(data)
             else:

patacrep/songs/chordpro/lexer.py

@@ -1,8 +1,12 @@
 """ChordPro lexer"""
 
+import functools
 import logging
+
 import ply.lex as lex
 
+from patacrep.songs import errors
+
 LOGGER = logging.getLogger()
 
 #pylint: disable=invalid-name
@@ -85,6 +89,7 @@ class ChordProLexer:
 
     def __init__(self, *, filename=None):
         self.__class__.lexer = lex.lex(module=self)
+        self.error_builders = []
         self.filename = filename
 
     # Define a rule so we can track line numbers
@@ -135,14 +140,20 @@ class ChordProLexer:
 
     def error(self, token, more=""):
         """Display error message, and skip illegal token."""
-        message = "Line {line}: Illegal character '{char}'{more}.".format(
-            line=token.lexer.lineno,
+        message = "Illegal character '{char}'{more}.".format(
             char=token.value[0],
             more=more,
             )
+        self.error_builders.append(functools.partial(
+            errors.SongSyntaxError,
+            line=token.lexer.lineno,
+            message=message,
+        ))
         if self.filename is not None:
-            message = "File {}: {}".format(self.filename, message)
-        LOGGER.error(message)
+            message = "Song {}, line {}: {}".format(self.filename, token.lexer.lineno, message)
+        else:
+            message = "Line {}: {}".format(token.lexer.lineno, message)
+        LOGGER.warning(message)
         token.lexer.skip(1)
 
     def t_error(self, token):

patacrep/songs/chordpro/syntax.py

@@ -5,9 +5,10 @@ import re
 
 import ply.yacc as yacc
 
-from patacrep.songs.syntax import Parser
+from patacrep.content import ContentError
 from patacrep.songs.chordpro import ast
 from patacrep.songs.chordpro.lexer import tokens, ChordProLexer
+from patacrep.songs.syntax import Parser
 
 LOGGER = logging.getLogger()
 
@@ -28,22 +29,28 @@ class ChordproParser(Parser):
             write_tables=0,
             )
 
-    def parse(self, content, *, lexer):
+    def parse(self, content):
         """Parse file
 
         This is a shortcut to `yacc.yacc(...).parse()`. The arguments are
         transmitted to this method.
         """
-        lexer = ChordProLexer(filename=self.filename).lexer
-        ast.AST.lexer = lexer
-        return self.parser.parse(content, lexer=lexer)
+        lexer = ChordProLexer(filename=self.filename)
+        ast.AST.lexer = lexer.lexer
+        parsed = self.parser.parse(content, lexer=lexer.lexer)
+        parsed.error_builders.extend(lexer.error_builders)
+        return parsed
 
     def p_song(self, symbols):
         """song : block song
                 | empty
         """
         if len(symbols) == 2:
-            symbols[0] = ast.Song(self.filename, self._directives)
+            symbols[0] = ast.Song(
+                self.filename,
+                directives=self._directives,
+                error_builders=self._errors,
+                )
         else:
             symbols[0] = symbols[2].add(symbols[1])
 
@@ -187,10 +194,12 @@ class ChordproParser(Parser):
         else:
             symbols[0] = None
 
-    @staticmethod
-    def p_line_error(symbols):
+    def p_line_error(self, symbols):
         """line_error : error directive"""
-        LOGGER.error("Directive can only be preceded or followed by spaces")
+        self.error(
+            line=symbols.lexer.lineno,
+            message="Directive can only be preceded or followed by spaces",
+            )
         symbols[0] = ast.Line()
 
     @staticmethod
@@ -317,10 +326,7 @@ class ChordproParser(Parser):
 def parse_song(content, filename=None):
     """Parse song and return its metadata."""
     parser = ChordproParser(filename)
-    parsed_content = parser.parse(
-        content,
-        lexer=ChordProLexer(filename=filename).lexer,
-        )
+    parsed_content = parser.parse(content)
     if parsed_content is None:
-        raise SyntaxError('Fatal error during song parsing: {}'.format(filename))
+        raise ContentError(message='Fatal error during song parsing.')
     return parsed_content

patacrep/songs/errors.py

@@ -0,0 +1,88 @@
+"""Errors in song definition (syntax errors, and so on)"""
+
+from patacrep.errors import SharedError
+
+class SongError(SharedError):
+    """Generic song error"""
+    # pylint: disable=too-few-public-methods
+
+    def __init__(self, song, message):
+        super().__init__()
+        self.song = song
+        self.message = message
+
+    def __str__(self):
+        return "{}: {}".format(self._human_song(), self.message)
+
+    def _human_song(self):
+        return "Datadir '{}', song '{}'".format(
+            self.song.datadir,
+            self.song.subpath,
+            )
+
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        parent.update({
+            'datadir': self.song.datadir,
+            'subpath': self.song.subpath,
+            'message': self.message,
+            'full_message': str(self),
+            })
+        return parent
+
+class SongSyntaxError(SongError):
+    """Syntax error"""
+    # pylint: disable=too-few-public-methods
+
+    def __init__(self, song, line, message):
+        super().__init__(song, message)
+        #: Line of error. May be `None` if irrelevant.
+        self.line = line
+
+    def __str__(self):
+        if self.line is not None:
+            return "{}, line {}: {}".format(self._human_song(), self.line, self.message)
+        else:
+            return "{}: {}".format(self._human_song(), self.message)
+
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        if self.line is not None:
+            parent.update({
+                'line': self.line,
+                })
+        return parent
+
+class FileNotFound(SongError):
+    """File not found error"""
+
+    def __init__(self, song, filename):
+        super().__init__(song, "File '{}' not found.".format(filename))
+        self.filename = filename
+
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        parent.update({
+            'filename': self.filename,
+            })
+        return parent
+
+class SongUnknownLanguage(SongError):
+    """Song language is not known."""
+
+    def __init__(self, song, original, fallback, message):
+        super().__init__(song, message)
+        self.original = original
+        self.fallback = fallback
+
+    @property
+    def __dict__(self):
+        parent = vars(super())
+        parent.update({
+            'original': self.original,
+            'fallback': self.fallback,
+            })
+        return parent

patacrep/songs/syntax.py

@@ -1,7 +1,10 @@
 """Generic parsing classes and methods"""
 
+import functools
 import logging
 
+from patacrep.songs import errors
+
 LOGGER = logging.getLogger()
 
 class Parser:
@@ -10,6 +13,7 @@ class Parser:
 
     def __init__(self):
         self.filename = "" # Will be overloaded
+        self._errors = []
 
     @staticmethod
     def __find_column(token):
@@ -21,7 +25,13 @@ class Parser:
         return column
 
     def error(self, *, line=None, column=None, message=""):
-        """Display an error message"""
+        """Record and display an error message"""
+        self._errors.append(functools.partial(
+            errors.SongSyntaxError,
+            line=line,
+            message=message,
+        ))
+
         coordinates = []
         if line is not None:
             coordinates.append("line {}".format(line))
@@ -35,18 +45,17 @@ class Parser:
         else:
             text += "."
         if self.filename is None:
-            LOGGER.error(text)
+            LOGGER.warning(text)
         else:
-            LOGGER.error("File {}: {}".format(self.filename, text))
+            LOGGER.warning("Song {}: {}".format(self.filename, text))
 
     def p_error(self, token):
         """Manage parsing errors."""
         if token is None:
-            self.error(
-                message="Unexpected end of file.",
-                )
+            self.error(message="Unexpected end of file.")
         else:
             self.error(
+                message="Syntax error",
                 line=token.lineno,
                 column=self.__find_column(token),
                 )

patacrep/templates.py

@@ -1,5 +1,6 @@
 """Template for .tex generation settings and utilities"""
 
+import logging
 import re
 import json
 
@@ -9,9 +10,11 @@ from jinja2.ext import Extension
 from jinja2.meta import find_referenced_templates as find_templates
 
 from patacrep import errors, files
-from patacrep.latex import lang2babel
+from patacrep.latex import lang2babel, UnknownLanguage
 import patacrep.encoding
 
+LOGGER = logging.getLogger(__name__)
+
 _LATEX_SUBS = (
     (re.compile(r'\\'), r'\\textbackslash'),
     (re.compile(r'([{}_#%&$])'), r'\\\1'),
@@ -42,6 +45,18 @@ _VARIABLE_REGEXP = re.compile(
     """,
     re.VERBOSE|re.DOTALL)
 
+def _escape_tex(value):
+    '''Escape TeX special characters'''
+    newval = value
+    for pattern, replacement in _LATEX_SUBS:
+        newval = pattern.sub(replacement, newval)
+    return newval
+
+DEFAULT_FILTERS = {
+    "escape_tex": _escape_tex,
+    "iter_datadirs": files.iter_datadirs,
+    "path2posix": files.path2posix,
+    }
 
 class VariablesExtension(Extension):
     """Extension to jinja2 to silently ignore variable block.
@@ -59,19 +74,12 @@ class VariablesExtension(Extension):
         return nodes.Const("") # pylint: disable=no-value-for-parameter
 
 
-def _escape_tex(value):
-    '''Escape TeX special characters'''
-    newval = value
-    for pattern, replacement in _LATEX_SUBS:
-        newval = pattern.sub(replacement, newval)
-    return newval
-
-
 class Renderer:
     """Render a template to a LaTeX file."""
     # pylint: disable=too-few-public-methods
 
     def __init__(self, template, jinjaenv, encoding=None):
+        self.errors = []
         self.encoding = encoding
         self.jinjaenv = jinjaenv
         self.jinjaenv.block_start_string = '(*'
@@ -81,14 +89,35 @@ class Renderer:
         self.jinjaenv.comment_start_string = '(% comment %)'
         self.jinjaenv.comment_end_string = '(% endcomment %)'
         self.jinjaenv.line_comment_prefix = '%!'
-        self.jinjaenv.filters['escape_tex'] = _escape_tex
         self.jinjaenv.trim_blocks = True
         self.jinjaenv.lstrip_blocks = True
-        self.jinjaenv.filters["path2posix"] = files.path2posix
-        self.jinjaenv.filters["iter_datadirs"] = files.iter_datadirs
-        self.jinjaenv.filters["lang2babel"] = lang2babel
+        # Fill default filters
+        for key, value in self.filters().items():
+            if key not in self.jinjaenv.filters:
+                self.jinjaenv.filters[key] = value
+
         self.template = self.jinjaenv.get_template(template)
 
+    def filters(self):
+        """Return a dictionary of jinja2 filters."""
+        filters = DEFAULT_FILTERS.copy()
+        filters.update({
+            "lang2babel": self.lang2babel,
+            })
+        return filters
+
+    def lang2babel(self, lang):
+        """Return the LaTeX babel code corresponding to `lang`.
+
+        Add an error to the list of errors if argument is invalid.
+        """
+        try:
+            return lang2babel(lang)
+        except UnknownLanguage as error:
+            error.message = "Songbook: {}".format(error.message)
+            LOGGER.warning(error.message)
+            self.errors.append(error)
+            return error.babel
 
 class TexBookRenderer(Renderer):
     """Tex renderer for the whole songbook"""

test/test_song/errors/invalid_content.csg.source

@@ -1,3 +0,0 @@
-{soc}
-Chorus
-{eoc

test/test_song/test_parser.py

@@ -11,6 +11,7 @@ from pkg_resources import resource_filename
 from patacrep import files
 from patacrep.songs import DEFAULT_CONFIG
 from patacrep.encoding import open_read
+from patacrep.songs import errors
 
 from .. import logging_reduced
 from .. import dynamic # pylint: disable=unused-import
@@ -97,14 +98,15 @@ class FileTest(unittest.TestCase, metaclass=dynamic.DynamicTest):
                         cls._create_test(base, in_format, out_format),
                         )
 
-            with cls.chdir('errors'):
-                for source in sorted(glob.glob('*.*.source')):
-                    [*base, in_format, _] = source.split('.')
-                    base = '.'.join(base)
-                    yield (
-                        "test_{}_{}_failure".format(base, in_format),
-                        cls._create_failure(base, in_format),
-                        )
+            if os.path.isdir("errors"):
+                with cls.chdir('errors'):
+                    for source in sorted(glob.glob('*.*.source')):
+                        [*base, in_format, _] = source.split('.')
+                        base = '.'.join(base)
+                        yield (
+                            "test_{}_{}_failure".format(base, in_format),
+                            cls._create_failure(base, in_format),
+                            )
 
     @classmethod
     def _create_test(cls, base, in_format, out_format):
@@ -126,7 +128,7 @@ class FileTest(unittest.TestCase, metaclass=dynamic.DynamicTest):
             sourcename = "{}.{}.source".format(base, in_format)
             with self.chdir('errors'):
                 parser = self.song_plugins[out_format][in_format]
-                self.assertRaises(SyntaxError, parser, sourcename, self.config)
+                self.assertRaises(errors.SongSyntaxError, parser, sourcename, self.config)
 
         test_parse_failure.__doc__ = (
             "Test that '{base}' parsing fails."

test/test_songbook/content.sb

@@ -0,0 +1,13 @@
+{
+"datadir": ["content_datadir"],
+"content": [
+  ["section", "Test of section"],
+  ["sorted"],
+  ["songsection", "Test of song section"],
+  ["cwd(content_datadir/content)",
+    "song.csg", "song.tsg",
+    ["tex", "foo.tex"]
+  ],
+  ["include", "include.sbc"]
+  ]
+}

test/test_songbook/content.tex.control

@@ -0,0 +1,156 @@
+
+
+
+
+
+
+%% Automatically generated document.
+%% You may edit this file but all changes will be overwritten.
+%% If you want to change this document, have a look at
+%% the templating system.
+%%
+%% Generated using Songbook <http://www.patacrep.com>
+
+\makeatletter
+\def\input@path{ %
+        {@TEST_FOLDER@/content_datadir/latex/} %
+        {@TEST_FOLDER@/latex/} %
+        {@DATA_FOLDER@/latex/} %
+}
+\makeatother
+
+\documentclass[
+    ]{article}
+
+\usepackage[
+    chorded,
+diagram,
+pictures,
+guitar,
+    ]{patacrep}
+
+\usepackage{lmodern}
+
+
+\PassOptionsToPackage{english}{babel}
+\PassOptionsToPackage{english}{babel}
+\usepackage[english]{babel}
+\lang{english}
+
+\usepackage{graphicx}
+\graphicspath{ %
+        {@TEST_FOLDER@/content_datadir/} %
+        {@TEST_FOLDER@/} %
+        {@DATA_FOLDER@/} %
+}
+
+
+\makeatletter
+\@ifpackageloaded{hyperref}{}{
+   \usepackage{url}
+   \newcommand{\phantomsection}{}
+   \newcommand{\hyperlink}[2]{#2}
+   \newcommand{\href}[2]{\expandafter\url\expandafter{#1}}
+}
+\makeatother
+
+
+\usepackage{chords}
+
+\title{Guitar songbook}
+\author{The Patacrep Team}
+
+\newindex{titleidx}{content_title}
+\newauthorindex{authidx}{content_auth}
+
+
+\notenamesout{A}{B}{C}{D}{E}{F}{G}
+
+
+\begin{document}
+
+\maketitle
+
+
+\showindex{\songindexname}{titleidx}
+\showindex{\authorindexname}{authidx}
+
+% list of chords
+\ifchorded
+  \ifdiagram
+     \phantomsection
+     \addcontentsline{toc}{section}{\chordlistname}
+     \chords
+  \fi
+\fi
+
+\phantomsection
+\addcontentsline{toc}{section}{\songlistname}
+
+
+\section{Test of section}
+
+\begin{songs}{titleidx,authidx}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% songs/./song.tsg
+
+\import{@TEST_FOLDER@/content_datadir/songs/}{song.tsg}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% songs/./song.csg
+
+\selectlanguage{english}
+
+\beginsong{This is a song}[
+  by={
+  },
+]
+
+
+
+
+\begin{verse}
+    Foo
+\end{verse}
+
+\endsong
+
+\end{songs}
+
+\songsection{Test of song section}
+
+\begin{songs}{titleidx,authidx}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% content_datadir/content/song.csg
+
+\selectlanguage{english}
+
+\beginsong{Yet another song}[
+  by={
+  },
+]
+
+
+\begin{verse}
+    Baz
+\end{verse}
+
+\endsong
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% content_datadir/content/song.tsg
+
+\import{@TEST_FOLDER@/content_datadir/content/}{song.tsg}
+
+\end{songs}
+
+\input{content_datadir/content/foo.tex}
+
+
+\section{This is an included section}
+
+
+
+
+
+\end{document}

test/test_songbook/content_datadir/content/foo.tex

@@ -0,0 +1 @@
+This is a \LaTeX{} file.

test/test_songbook/content_datadir/content/inter.isg

@@ -0,0 +1,5 @@
+\begin{intersong}
+\sortassong{}[by={The Patacrep Team}]
+
+This is another example of an intersong.
+\end{intersong}

test/test_songbook/content_datadir/content/song.csg

@@ -0,0 +1,2 @@
+{title : Yet another song}
+Baz

test/test_songbook/content_datadir/content/song.tsg

@@ -0,0 +1,3 @@
+\beginsong{One last song}
+  Tagada
+\endsong

test/test_songbook/content_datadir/songs/include.sbc

@@ -0,0 +1 @@
+[["section", "This is an included section"]]

test/test_songbook/content_datadir/songs/inter.isg

@@ -0,0 +1,5 @@
+\begin{intersong}
+\sortassong{}[by={The Patacrep Team}]
+
+This is an example of an intersong.
+\end{intersong}

test/test_songbook/content_datadir/songs/song.csg

@@ -0,0 +1,3 @@
+{title : This is a song}
+
+Foo

test/test_songbook/content_datadir/songs/song.tsg

@@ -0,0 +1,3 @@
+\beginsong{This is another song}
+  Bar.
+\endsong