From edc3c8dbff44ba2ace9331c602a596b1673fd365 Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Sun, 28 Jan 2018 12:47:30 -0800
Subject: [PATCH] Pass explicit font paths to fontspec in backend_pgf.

---
 .../2018-02-15-AL-deprecations.rst            |  1 +
 lib/matplotlib/backends/backend_pgf.py        | 54 ++++++-------------
 2 files changed, 17 insertions(+), 38 deletions(-)

diff --git a/doc/api/next_api_changes/2018-02-15-AL-deprecations.rst b/doc/api/next_api_changes/2018-02-15-AL-deprecations.rst
index d8a60750c1d1..51198eef7a4e 100644
--- a/doc/api/next_api_changes/2018-02-15-AL-deprecations.rst
+++ b/doc/api/next_api_changes/2018-02-15-AL-deprecations.rst
@@ -11,6 +11,7 @@ The following modules are deprecated:
 The following classes, methods, functions, and attributes are deprecated:
 
 - ``afm.parse_afm``,
+- ``backend_pgf.get_texcommand``,
 - ``backend_qt5.error_msg_qt``, ``backend_qt5.exception_handler``,
 - ``backend_wx.FigureCanvasWx.macros``,
 - ``cbook.GetRealpathAndStat``, ``cbook.Locked``,
diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
index 4ddeb6884516..02e214655db0 100644
--- a/lib/matplotlib/backends/backend_pgf.py
+++ b/lib/matplotlib/backends/backend_pgf.py
@@ -4,6 +4,7 @@
 import logging
 import math
 import os
+from pathlib import Path
 import re
 import shutil
 import subprocess
@@ -13,7 +14,7 @@
 import weakref
 
 import matplotlib as mpl
-from matplotlib import _png, rcParams, __version__
+from matplotlib import _png, cbook, font_manager as fm, __version__, rcParams
 from matplotlib.backend_bases import (
     _Backend, FigureCanvasBase, FigureManagerBase, GraphicsContextBase,
     RendererBase)
@@ -28,33 +29,13 @@
 
 ###############################################################################
 
-# create a list of system fonts, all of these should work with xe/lua-latex
-system_fonts = []
-if sys.platform == 'win32':
-    from matplotlib import font_manager
-    for f in font_manager.win32InstalledFonts():
-        try:
-            system_fonts.append(font_manager.get_font(str(f)).family_name)
-        except:
-            pass # unknown error, skip this font
-else:
-    # assuming fontconfig is installed and the command 'fc-list' exists
-    try:
-        # list scalable (non-bitmap) fonts
-        fc_list = subprocess.check_output(
-            ['fc-list', ':outline,scalable', 'family'])
-        fc_list = fc_list.decode('utf8')
-        system_fonts = [f.split(',')[0] for f in fc_list.splitlines()]
-        system_fonts = list(set(system_fonts))
-    except:
-        warnings.warn('error getting fonts from fc-list', UserWarning)
-
 
 _luatex_version_re = re.compile(
     r'This is LuaTeX, Version (?:beta-)?([0-9]+)\.([0-9]+)\.([0-9]+)'
 )
 
 
+@cbook.deprecated("3.0")
 def get_texcommand():
     """Get chosen TeX system from rc."""
     texsystem_options = ["xelatex", "lualatex", "pdflatex"]
@@ -77,23 +58,20 @@ def _parse_lualatex_version(output):
 def get_fontspec():
     """Build fontspec preamble from rc."""
     latex_fontspec = []
-    texcommand = get_texcommand()
+    texcommand = rcParams["pgf.texsystem"]
 
     if texcommand != "pdflatex":
         latex_fontspec.append("\\usepackage{fontspec}")
 
     if texcommand != "pdflatex" and rcParams["pgf.rcfonts"]:
-        # try to find fonts from rc parameters
-        families = ["serif", "sans-serif", "monospace"]
-        fontspecs = [r"\setmainfont{%s}", r"\setsansfont{%s}",
-                     r"\setmonofont{%s}"]
-        for family, fontspec in zip(families, fontspecs):
-            matches = [f for f in rcParams["font." + family]
-                       if f in system_fonts]
-            if matches:
-                latex_fontspec.append(fontspec % matches[0])
-            else:
-                pass  # no fonts found, fallback to LaTeX defaule
+        families = ["serif", "sans\\-serif", "monospace"]
+        commands = ["setmainfont", "setsansfont", "setmonofont"]
+        for family, command in zip(families, commands):
+            # 1) Forward slashes also work on Windows, so don't mess with
+            # backslashes.  2) The dirname needs to include a separator.
+            path = Path(fm.findfont(family))
+            latex_fontspec.append(r"\%s{%s}[Path=%s]" % (
+                command, path.name, path.parent.as_posix() + "/"))
 
     return "\n".join(latex_fontspec)
 
@@ -163,7 +141,7 @@ def _font_properties_str(prop):
     family = prop.get_family()[0]
     if family in families:
         commands.append(families[family])
-    elif family in system_fonts and get_texcommand() != "pdflatex":
+    elif family in system_fonts and rcParams["pgf.texsystem"] != "pdflatex":
         commands.append(r"\setmainfont{%s}\rmfamily" % family)
     else:
         pass  # print warning?
@@ -232,7 +210,7 @@ class LatexManagerFactory:
 
     @staticmethod
     def get_latex_manager():
-        texcommand = get_texcommand()
+        texcommand = rcParams["pgf.texsystem"]
         latex_header = LatexManager._build_latex_header()
         prev = LatexManagerFactory.previous_instance
 
@@ -307,7 +285,7 @@ def __init__(self):
         LatexManager._unclean_instances.add(self)
 
         # test the LaTeX setup to ensure a clean startup of the subprocess
-        self.texcommand = get_texcommand()
+        self.texcommand = rcParams["pgf.texsystem"]
         self.latex_header = LatexManager._build_latex_header()
         latex_end = "\n\\makeatletter\n\\@@end\n"
         try:
@@ -909,7 +887,7 @@ def _print_pdf_to_fh(self, fh, *args, **kwargs):
             with codecs.open(fname_tex, "w", "utf-8") as fh_tex:
                 fh_tex.write(latexcode)
 
-            texcommand = get_texcommand()
+            texcommand = rcParams["pgf.texsystem"]
             cmdargs = [texcommand, "-interaction=nonstopmode",
                        "-halt-on-error", "figure.tex"]
             try: