[diffoscope] 01/03: Add comparator for Postscript files

[Reiner Herrmann]

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deki-guest pushed a commit to branch master
in repository diffoscope.

commit d9bc6c873a4418dece906cd3f3888ea16c3811a4
Author: Reiner Herrmann <reiner at reiner-h.de>
Date:   Sat Feb 27 18:24:47 2016 +0100

    Add comparator for Postscript files
---
 diffoscope/__init__.py             |  2 ++
 diffoscope/comparators/__init__.py |  2 ++
 diffoscope/comparators/ps.py       | 50 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/diffoscope/__init__.py b/diffoscope/__init__.py
index 0eab5af..b0a9174 100644
--- a/diffoscope/__init__.py
+++ b/diffoscope/__init__.py
@@ -85,6 +85,8 @@ class RequiredToolNotFound(Exception):
                                 , 'arch': 'mono-tools' }
                 , 'ppudump':    { 'debian': 'fp-utils'
                                 , 'arch': 'fpc' }
+                , 'ps2ascii':   { 'debian': 'ghostscript'
+                                , 'arch': 'ghostscript' }
                 , 'readelf':    { 'debian': 'binutils-multiarch'
                                 , 'arch': 'binutils' }
                 , 'rpm2cpio':   { 'debian': 'rpm2cpio'
diff --git a/diffoscope/comparators/__init__.py b/diffoscope/comparators/__init__.py
index 0f30351..9d710f1 100644
--- a/diffoscope/comparators/__init__.py
+++ b/diffoscope/comparators/__init__.py
@@ -61,6 +61,7 @@ from diffoscope.comparators.mono import MonoExeFile
 from diffoscope.comparators.pdf import PdfFile
 from diffoscope.comparators.png import PngFile
 from diffoscope.comparators.ppu import PpuFile
+from diffoscope.comparators.ps import PsFile
 try:
     from diffoscope.comparators.rpm import RpmFile
 except ImportError as ex:
@@ -132,6 +133,7 @@ FILE_CLASSES = (
     Md5sumsFile,
     DebDataTarFile,
     ElfSection,
+    PsFile,
     TextFile,
     Bzip2File,
     CpioFile,
diff --git a/diffoscope/comparators/ps.py b/diffoscope/comparators/ps.py
new file mode 100644
index 0000000..98149d9
--- /dev/null
+++ b/diffoscope/comparators/ps.py
@@ -0,0 +1,50 @@
+# -*- coding: utf-8 -*-
+#
+# diffoscope: in-depth comparison of files, archives, and directories
+#
+# Copyright © 2016 Reiner Herrmann <reiner at reiner-h.de>
+#
+# diffoscope is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# diffoscope is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with diffoscope.  If not, see <http://www.gnu.org/licenses/>.
+
+import re
+from diffoscope import tool_required, RequiredToolNotFound, logger
+from diffoscope.comparators.text import TextFile
+from diffoscope.comparators.utils import Command
+from diffoscope.difference import Difference
+
+
+class Pstotext(Command):
+    @tool_required('ps2ascii')
+    def cmdline(self):
+        return ['ps2ascii', self.path]
+
+
+class PsFile(TextFile):
+    RE_FILE_TYPE = re.compile(r'^PostScript document\b')
+
+    @staticmethod
+    def recognizes(file):
+        return PsFile.RE_FILE_TYPE.match(file.magic_file_type)
+
+    def compare(self, other, source=None):
+        differences = super().compare(other, source)
+        details = None
+        try:
+            details = Difference.from_command(Pstotext, self.path, other.path)
+        except RequiredToolNotFound:
+            logger.debug('ps2ascii not found')
+
+        if details:
+            differences.add_details([details])
+        return differences

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