escape chars in title, too

Fixes #332.

Author: nschloe

test/test_escape_chars.py

@@ -0,0 +1,18 @@
+# https://github.com/nschloe/tikzplotlib/issues/332
+import matplotlib.pyplot as plt
+
+from helpers import assert_equality
+
+
+def plot():
+    fig = plt.figure()
+    plt.plot(0, 0, "kx")
+    plt.title("Foo & Bar Dogs_N_Cats")
+    plt.xlabel("Foo & Bar Dogs_N_Cats")
+    plt.ylabel("Foo & Bar Dogs_N_Cats")
+    return fig
+
+
+def test():
+    assert_equality(plot, "test_escape_chars_reference.tex")
+    return

test/test_escape_chars_reference.tex

@@ -0,0 +1,22 @@
+\begin{tikzpicture}
+
+\begin{axis}[
+tick align=outside,
+tick pos=left,
+title={Foo & Bar Dogs\_N\_Cats},
+x grid style={white!69.01960784313725!black},
+xlabel={Foo & Bar Dogs\_N\_Cats},
+xmin=-0.055, xmax=0.055,
+xtick style={color=black},
+y grid style={white!69.01960784313725!black},
+ylabel={Foo & Bar Dogs\_N\_Cats},
+ymin=-0.055, ymax=0.055,
+ytick style={color=black}
+]
+\addplot [semithick, black, mark=x, mark size=3, mark options={solid}, only marks]
+table {%
+0 0
+};
+\end{axis}
+
+\end{tikzpicture}

tikzplotlib/axes.py

@@ -36,6 +36,7 @@ def __init__(self, data, obj):  # noqa: C901
         title = obj.get_title()
         data["current axis title"] = title
         if title:
+            title = mpl_backend_pgf.common_texification(title)
             self.axis_options.append(u"title={{{}}}".format(title))
 
         # get axes titles