better relative imports and load_yaml in tempaltes

bin/pretex

@@ -7,7 +7,7 @@ With slightly different syntax:
 #  ... ## => %$ ... %#     for Line Statements
 
 Usage:
-  pretex [<templates>] --data=<yamlfile> [options]
+  pretex [<templates>] [options]
 
 Arguments:
   <templates>          Compiles every given file ending with ".j2.tex" into
@@ -27,7 +27,7 @@ Options:
                        [default: {TEX} {ARG} {document}.tex, {BIB} {document}, {TEX} {ARG} {document}.tex, {TEX} {ARG} {document}.tex]
   --clean              Clean aux files.
   -f --files=<end>     Files to clean.
-                       [default: *.aux, *.bbl, *.blg, *.idx, *.ind, *.lof, *.lot, *.out, *.toc, *.acn, *.acr, *.alg, *.glg, *.glo, *.gls, *.ist, *.fls, *.log, *.fdb_latexmk, *.synctex.gz]
+                       [default: *.aux, *.bbl, *.blg, *.idx, *.ind, *.lof, *.lot, *.out, *.toc, *.acn, *.acr, *.alg, *.glg, *.glo, *.gls, *.ist, *.fls, *.log, *.fdb_latexmk]
 """
 
 import yaml
@@ -89,7 +89,10 @@ def compile_all(data, templates, pdf, cmd, copy, clean):
                 continue
             path, filename = os.path.split(compiled_file)
             for command in cmd(filename[:-4]):
-                subprocess.call(shlex.split(command), cwd=path, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+                cwd = path
+                if cwd == '':
+                    cwd = None
+                subprocess.call(shlex.split(command), cwd=cwd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
 
             if copy:
                 if not os.path.exists(copy):
@@ -103,8 +106,10 @@ def compile_all(data, templates, pdf, cmd, copy, clean):
 
 
 def compile_file(tex_file, data, file=None):
-    template = latex_jinja_env.get_template(tex_file)
+    template = latex_jinja_env.get_template(os.path.abspath(tex_file))
-    rendered = template.render(**data)
+
+    path, filename = os.path.split(tex_file)
+    rendered = template.render(**data, load_yaml=functools.partial(load_yaml, path=path))
     if file is None:
         return rendered
     f = open(file, 'w')
@@ -112,6 +117,10 @@ def compile_file(tex_file, data, file=None):
     f.close()
     return f'"{tex_file}" successful rendered into "{file}"'
 
+def load_yaml(filename, path=""):
+    with open(os.path.join(path,filename)) as file:
+        data = yaml.load(file, Loader=yaml.FullLoader)
+    return data
 
 if __name__ == '__main__':
     arguments = docopt(__doc__)
@@ -127,13 +136,15 @@ if __name__ == '__main__':
         line_comment_prefix = '%#',
         trim_blocks = True,
         autoescape = False,
-        loader = jinja2.FileSystemLoader(os.path.abspath('.')),
+        loader = jinja2.FileSystemLoader(os.path.abspath('/')),
     )
 
     latex_jinja_env.filters['datetime'] = datetime_filter
 
-    with open(arguments['--data']) as file:
+    if arguments['--data']:
-        data = yaml.load(file, Loader=yaml.FullLoader)["data"]
+        data = load_yaml(arguments["--data"])
+    else:
+        data = {}
 
     cmd = functools.partial(get_latex_toolchain, arguments)
     compile_all(data, arguments['<templates>'], arguments['--pdf'], cmd, arguments['--copy'], arguments['--clean'] and arguments['--files'])