Implement PDF metadata on PGF backend.

QuLogic · QuLogic · commit 390e43807fe2 · 2020-06-01T16:37:22.000-04:00
This is supported through the multipage PdfPages, but not direct output
of a single figure via PGF.
diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
@@ -868,9 +868,13 @@ def print_pgf(self, fname_or_fh, *args, **kwargs):
                 file = codecs.getwriter("utf-8")(file)
             self._print_pgf_to_fh(file, *args, **kwargs)
 
-    def _print_pdf_to_fh(self, fh, *args, **kwargs):
+    def _print_pdf_to_fh(self, fh, *args, metadata=None, **kwargs):
         w, h = self.figure.get_figwidth(), self.figure.get_figheight()
 
+        info_dict = _create_pdf_info_dict('pgf', metadata or {})
+        hyperref_options = ','.join(
+            f'{k}={{{v}}}' for k, v in info_dict.items())
+
         try:
             # create temporary directory for compiling the figure
             tmpdir = tempfile.mkdtemp(prefix="mpl_pgf_")
@@ -884,6 +888,8 @@ def _print_pdf_to_fh(self, fh, *args, **kwargs):
             latex_preamble = get_preamble()
             latex_fontspec = get_fontspec()
             latexcode = """
+\\PassOptionsToPackage{pdfinfo={%s}}{hyperref}
+\\RequirePackage{hyperref}
 \\documentclass[12pt]{minimal}
 \\usepackage[paperwidth=%fin, paperheight=%fin, margin=0in]{geometry}
 %s
@@ -893,7 +899,7 @@ def _print_pdf_to_fh(self, fh, *args, **kwargs):
 \\begin{document}
 \\centering
 \\input{figure.pgf}
-\\end{document}""" % (w, h, latex_preamble, latex_fontspec)
+\\end{document}""" % (hyperref_options, w, h, latex_preamble, latex_fontspec)
             pathlib.Path(fname_tex).write_text(latexcode, encoding="utf-8")
 
             texcommand = mpl.rcParams["pgf.texsystem"]
