Factor out a subprocess log-and-check helper.

anntzer · anntzer · commit 7e78b0010e77 · 2018-08-19T20:30:45.000+02:00
diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
@@ -870,15 +870,9 @@ def _print_pdf_to_fh(self, fh, *args, **kwargs):
             pathlib.Path(fname_tex).write_text(latexcode, encoding="utf-8")
 
             texcommand = rcParams["pgf.texsystem"]
-            cmdargs = [texcommand, "-interaction=nonstopmode",
-                       "-halt-on-error", "figure.tex"]
-            try:
-                subprocess.check_output(
-                    cmdargs, stderr=subprocess.STDOUT, cwd=tmpdir)
-            except subprocess.CalledProcessError as e:
-                raise RuntimeError(
-                    "%s was not able to process your file.\n\nFull log:\n%s"
-                    % (texcommand, e.output))
+            cbook._check_and_log_subprocess(
+                [texcommand, "-interaction=nonstopmode", "-halt-on-error",
+                 "figure.tex"], cwd=tmpdir)
 
             # copy file contents to target
             with open(fname_pdf, "rb") as fh_src:
@@ -1101,21 +1095,10 @@ def close(self):
 
     def _run_latex(self):
         texcommand = rcParams["pgf.texsystem"]
-        cmdargs = [
-            texcommand,
-            "-interaction=nonstopmode",
-            "-halt-on-error",
-            os.path.basename(self._fname_tex),
-        ]
-        try:
-            subprocess.check_output(
-                cmdargs, stderr=subprocess.STDOUT, cwd=self._tmpdir
-            )
-        except subprocess.CalledProcessError as e:
-            raise RuntimeError(
-                "%s was not able to process your file.\n\nFull log:\n%s"
-                % (texcommand, e.output.decode('utf-8')))
-
+        cbook._check_and_log_subprocess(
+            [texcommand, "-interaction=nonstopmode", "-halt-on-error",
+             os.path.basename(self._fname_tex)],
+            cwd=self._tmpdir)
         # copy file contents to target
         shutil.copyfile(self._fname_pdf, self._outputfile)
 
diff --git a/lib/matplotlib/backends/backend_ps.py b/lib/matplotlib/backends/backend_ps.py
@@ -1421,34 +1421,12 @@ def convert_psfrags(tmpfile, psfrags, font_preamble, custom_preamble,
     latexfile = latexfile.replace("\\", "/")
     # Replace ~ so Latex does not think it is line break
     latexfile = latexfile.replace("~", "\\string~")
-    command = ["latex", "-interaction=nonstopmode", '"%s"' % latexfile]
-    _log.debug('%s', command)
-    try:
-        report = subprocess.check_output(command, cwd=tmpdir,
-                                         stderr=subprocess.STDOUT)
-    except subprocess.CalledProcessError as exc:
-        raise RuntimeError(
-            ('LaTeX was not able to process the following '
-             'file:\n%s\n\n'
-             'Here is the full report generated by LaTeX:\n%s '
-             '\n\n' % (latexfile,
-                       exc.output.decode("utf-8"))))
-    _log.debug(report)
-
-    command = ['dvips', '-q', '-R0', '-o', os.path.basename(psfile),
-               os.path.basename(dvifile)]
-    _log.debug(command)
-    try:
-        report = subprocess.check_output(command, cwd=tmpdir,
-                                         stderr=subprocess.STDOUT)
-    except subprocess.CalledProcessError as exc:
-        raise RuntimeError(
-            ('dvips was not able to process the following '
-             'file:\n%s\n\n'
-             'Here is the full report generated by dvips:\n%s '
-             '\n\n' % (dvifile,
-                       exc.output.decode("utf-8"))))
-    _log.debug(report)
+
+    cbook._check_and_log_subprocess(
+        ["latex", "-interaction=nonstopmode", '"%s"' % latexfile])
+    cbook._check_and_log_subprocess(
+        ['dvips', '-q', '-R0', '-o', os.path.basename(psfile),
+         os.path.basename(dvifile)], cwd=tmpdir)
     os.remove(epsfile)
     shutil.move(psfile, tmpfile)
 
@@ -1493,18 +1471,11 @@ def gs_distill(tmpfile, eps=False, ptype='letter', bbox=None, rotated=False):
     else:
         device_name = "pswrite"
 
-    command = [str(gs_exe), "-dBATCH", "-dNOPAUSE", "-r%d" % dpi,
-               "-sDEVICE=%s" % device_name, paper_option,
-               "-sOutputFile=%s" % psfile, tmpfile]
-    _log.debug(command)
-    try:
-        report = subprocess.check_output(command, stderr=subprocess.STDOUT)
-    except subprocess.CalledProcessError as exc:
-        raise RuntimeError(
-            ('ghostscript was not able to process your image.\n'
-             'Here is the full report generated by ghostscript:\n%s '
-             '\n\n' % exc.output.decode("utf-8")))
-    _log.debug(report)
+    cbook._check_and_log_subprocess(
+        [gs_exe, "-dBATCH", "-dNOPAUSE", "-r%d" % dpi,
+         "-sDEVICE=%s" % device_name, paper_option,
+         "-sOutputFile=%s" % psfile, tmpfile])
+
     os.remove(tmpfile)
     shutil.move(psfile, tmpfile)
 
@@ -1535,35 +1506,18 @@ def xpdf_distill(tmpfile, eps=False, ptype='letter', bbox=None, rotated=False):
 
     # Pass options as `-foo#bar` instead of `-foo=bar` to keep Windows happy
     # (https://www.ghostscript.com/doc/9.22/Use.htm#MS_Windows).
-    command = ["ps2pdf",
-               "-dAutoFilterColorImages#false",
-               "-dAutoFilterGrayImages#false",
-               "-dAutoRotatePages#false",
-               "-sGrayImageFilter#FlateEncode",
-               "-sColorImageFilter#FlateEncode",
-               "-dEPSCrop" if eps else "-sPAPERSIZE#%s" % ptype,
-               tmpfile, pdffile]
-    _log.debug(command)
-
-    try:
-        report = subprocess.check_output(command, stderr=subprocess.STDOUT)
-    except subprocess.CalledProcessError as exc:
-        raise RuntimeError(
-            ('ps2pdf was not able to process your image.\n'
-             'Here is the full report generated by ps2pdf:\n%s '
-             '\n\n' % exc.output.decode("utf-8")))
-    _log.debug(report)
+    cbook._check_and_log_subprocess(
+        ["ps2pdf",
+         "-dAutoFilterColorImages#false",
+         "-dAutoFilterGrayImages#false",
+         "-dAutoRotatePages#false",
+         "-sGrayImageFilter#FlateEncode",
+         "-sColorImageFilter#FlateEncode",
+         "-dEPSCrop" if eps else "-sPAPERSIZE#%s" % ptype,
+         tmpfile, pdffile])
+    cbook._check_and_log_subprocess(
+        ["pdftops", "-paper", "match", "-level2", pdffile, psfile])
 
-    command = ["pdftops", "-paper", "match", "-level2", pdffile, psfile]
-    _log.debug(command)
-    try:
-        report = subprocess.check_output(command, stderr=subprocess.STDOUT)
-    except subprocess.CalledProcessError as exc:
-        raise RuntimeError(
-            ('pdftops was not able to process your image.\n'
-             'Here is the full report generated by pdftops:\n%s '
-             '\n\n' % exc.output.decode("utf-8")))
-    _log.debug(report)
     os.remove(tmpfile)
     shutil.move(psfile, tmpfile)
 
diff --git a/lib/matplotlib/cbook/__init__.py b/lib/matplotlib/cbook/__init__.py
@@ -2075,3 +2075,19 @@ def _unmultipled_rgba8888_to_premultiplied_argb32(rgba8888):
     if alpha8.min() != 0xff:
         np.multiply(rgb24, alpha8 / 0xff, out=rgb24, casting="unsafe")
     return argb32
+
+
+def _check_and_log_subprocess(self, command, **kwargs):
+    _log.debug(command)
+    try:
+        report = subprocess.check_output(
+            command, stderr=subprocess.STDOUT, **kwargs)
+    except subprocess.CalledProcessError as exc:
+        raise RuntimeError(
+            'The command\n'
+            '    {}\n'
+            'failed and generated the following output:\n'
+            '{}'
+            .format(command, exc.output.decode('utf-8')))
+    _log.debug(report)
+    return report
