Reverting useless commit

Revert "Added \obeylines command to verse, verse* and chorus environments."

This reverts commit 315915221c.

songbook_core/data/latex/songs_minimal.sty

@@ -1,8 +0,0 @@
-% Minimal songs.sty package, to be loaded by the songbook_core library, by the
-% PlasTeX packages. Some songs.sty commands are implemented in Python, in the
-% songbook_core/plastex*.py packages, and some commands are implemented in this
-% file.
-
-\newenvironment{chorus}{\obeylines}{}
-\newenvironment{verse}{\obeylines}{}
-\newenvironment{verse*}{\obeylines}{}

songbook_core/errors.py

@@ -85,15 +85,3 @@ class UnknownStep(SongbookError):
     def __str__(self):
         return """Compilation step "{step}" unknown.""".format(step=self.step)
 
-
-class LatexImportError(SongbookError):
-    """Could not import package."""
-
-    def __init__(self, package):
-        super(LatexImportError, self).__init__()
-        self.package = package
-
-    def __str__(self):
-        return """Error while importing LaTeX package "{}".""".format(
-                self.package
-                )

songbook_core/plastex.py

@@ -11,9 +11,6 @@ import locale
 import os
 import sys
 
-from songbook_core import __DATADIR__
-from songbook_core import errors
-
 
 def process_unbr_spaces(node):
     r"""Replace '~' and '\ ' in node by nodes that
@@ -52,37 +49,16 @@ class SongParser(object):
     """Analyseur syntaxique de fichiers .sg"""
 
     @staticmethod
-    def load_package(tex, package):
-        """Wrapper to 'tex.ownerDocument.context.loadPackage' catching errors.
-        """
-        if not tex.ownerDocument.context.loadPackage(tex, package):
-            raise errors.LatexImportError(package)
-
-    @classmethod
-    def create_tex(cls):
+    def create_tex():
         """Create a TeX object, ready to parse a tex file."""
         tex = TeX()
         tex.disableLogging()
         tex.ownerDocument.context.loadBaseMacros()
-
-        # Setting paths
         sys.path.append(os.path.dirname(__file__))
-        old_texinputs = os.environ.get("TEXINPUTS", '')
-        os.environ["TEXINPUTS"] = "{}:{}".format(
-                old_texinputs,
-                os.path.join(__DATADIR__, "latex"),
-                )
-
-        # Loading packages
-        cls.load_package(tex, "plastex_patchedbabel")
-        cls.load_package(tex, "plastex_chord")
-        cls.load_package(tex, "plastex_songs")
-        cls.load_package(tex, "songs_minimal.sty")
-
-        # Unsetting paths
+        tex.ownerDocument.context.loadPackage(tex, "plastex_patchedbabel")
+        tex.ownerDocument.context.loadPackage(tex, "plastex_chord")
+        tex.ownerDocument.context.loadPackage(tex, "plastex_songs")
         sys.path.pop()
-        os.environ["TEXINPUTS"] = old_texinputs
-
         return tex
 
     @classmethod