8000 pgf: Pass PDF metadata via pdfinfo option. · matplotlib/matplotlib@77a68c6 · GitHub
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pgf: Pass PDF metadata via pdfinfo option.
This takes keys that match the PDF specification instead of lower-case, 'pdf'-prefixed keys, so is a bit simpler. Also, deprecate ability to accept key case-insensitively, as that is not done in the PDF backend.
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‎doc/api/api_changes_3.3/deprecations.rst

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Original file line numberDiff line numberDiff line change
@@ -593,3 +593,11 @@ APIs which support the values True, False, and "TeX" for ``ismath``.
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``matplotlib.ttconv``
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~~~~~~~~~~~~~~~~~~~~~
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This module is deprecated.
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Stricter PDF metadata keys in PGF
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Saving metadata in PDF with the PGF backend currently normalizes all keys to
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lowercase, unlike the PDF backend, which only accepts the canonical case. This
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is deprecated; in a future version, only the canonically cased keys listed in
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the PDF specification (and the `~.backend_pgf.PdfPages` documentation) will be
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accepted.

‎lib/matplotlib/backends/backend_pgf.py

Lines changed: 23 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -1017,7 +1017,20 @@ def __init__(self, filename, *, keep_empty=True, metadata=None):
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self._outputfile = filename
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self._n_figures = 0
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self.keep_empty = keep_empty
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self.metadata = metadata or {}
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self.metadata = (metadata or {}).copy()
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if metadata:
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for key in metadata:
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canonical = {
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'creationdate': 'CreationDate',
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'moddate': 'ModDate',
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}.get(key.lower(), key.lower().title())
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if canonical != key:
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cbook.warn_deprecated(
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'3.3', message='Support for setting PDF metadata keys '
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'case-insensitively is deprecated since %(since)s and '
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'will be removed %(removal)s; '
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f'set {canonical} instead of {key}.')
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self.metadata[canonical] = self.metadata.pop(key)
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# create temporary directory for compiling the figure
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self._tmpdir = tempfile.mkdtemp(prefix="mpl_pgf_pdfpages_")
@@ -1028,27 +1041,28 @@ def __init__(self, filename, *, keep_empty=True, metadata=None):
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def _write_header(self, width_inches, height_inches):
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supported_keys = {
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'title', 'author', 'subject', 'keywords', 'creator',
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'producer', 'trapped'
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'Title', 'Author', 'Subject', 'Keywords', 'Creator',
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'Producer', 'Trapped'
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}
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infoDict = {
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'creator': f'matplotlib {mpl.__version__}, https://matplotlib.org',
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'producer': f'matplotlib pgf backend {mpl.__version__}',
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'Creator': f'matplotlib {mpl.__version__}, https://matplotlib.org',
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'Producer': f'matplotlib pgf backend {mpl.__version__}',
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**self.metadata
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}
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metadata = {k.lower(): v for k, v in self.metadata.items()}
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infoDict.update(metadata)
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hyperref_options = ''
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for k, v in infoDict.items():
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if k not in supported_keys:
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raise ValueError(
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'Not a supported pdf metadata field: "{}"'.format(k)
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)
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hyperref_options += 'pdf' + k + '={' + str(v) + '},'
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hyperref_options += k + '={' + str(v) + '},'
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latex_preamble = get_preamble()
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latex_fontspec = get_fontspec()
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latex_header = r"""\PassOptionsToPackage{{
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{metadata}
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pdfinfo={{
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{metadata}
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}}
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}}{{hyperref}}
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\RequirePackage{{hyperref}}
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\documentclass[12pt]{{minimal}}

‎lib/matplotlib/tests/test_backend_pgf.py

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -255,7 +255,7 @@ def test_pdf_pages_metadata():
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ax.plot(range(5))
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fig.tight_layout()
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md = {'author': 'me', 'title': 'Multipage PDF with pgf'}
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md = {'Author': 'me', 'Title': 'Multipage PDF with pgf'}
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path = os.path.join(result_dir, 'pdfpages_meta.pdf')
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with PdfPages(path, metadata=md) as pdf:
@@ -282,7 +282,7 @@ def test_pdf_pages_lualatex():
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ax.plot(range(5))
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fig.tight_layout()
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md = {'author': 'me', 'title': 'Multipage PDF with pgf'}
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md = {'Author': 'me', 'Title': 'Multipage PDF with pgf'}
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path = os.path.join(result_dir, 'pdfpages_lua.pdf')
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with PdfPages(path, metadata=md) as pdf:
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pdf.savefig(fig)

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