Make 'pyshark' an optional dependency

pyproject.toml

@@ -0,0 +1,2 @@
+[build-system]
+requires = ["setuptools"]

requirements.txt

@@ -2,4 +2,3 @@ construct
 pyserial
 crcmod
 cmd2
-pyshark

sedbgmux-dump.py

@@ -46,7 +46,7 @@ class SEDbgMuxDumpApp:
         'auto'      : (dumpio_auto, 'Automatic dump format detection (by filename)'),
         'native'    : (DumpIONative, 'Native binary dump format for this package'),
         'socat'     : (DumpIOSocat, 'ASCII hexdump generated by socat (-x option)'),
-        'btpcap'    : (DumpIOBtPcap, 'PCAP file with Bluetooth RFCOMM packets'),
+        'btpcap'    : (DumpIOBtPcap, 'PCAP file with Bluetooth RFCOMM packets (requires pyshark)'),
     }
 
     def __init__(self, argv) -> None:

sedbgmux/io/dump_btpcap.py

@@ -19,7 +19,6 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 import logging
-import pyshark
 
 from . import DumpIO
 from . import DumpIOError
@@ -38,9 +37,14 @@ class DumpIOBtPcap(DumpIO):
         self.timestamp = 0.0  # cached
         self.readonly = readonly
 
+        try:
+            from pyshark import FileCapture
+        except ImportError as e:
+            raise DumpIOError('pyshark is not installed') from e
+
         log.info('Opening Bluetooth RFCOMM capture %s', fname)
         dfilter = 'btrfcomm.channel == %s' % kw.get('chan', '2')
-        self._pcap = pyshark.FileCapture(fname, display_filter=dfilter)
+        self._pcap = FileCapture(fname, display_filter=dfilter)
         self._find_connect()
 
     def read(self) -> dict:

setup.py

@@ -0,0 +1,26 @@
+from setuptools import setup
+
+setup(
+    name='sedbgmux',
+    version='1.0',
+    url='https://gitea.osmocom.org/fixeria/sedbgmux',
+    license='GPLv3',
+    author='Vadim Yanitskiy',
+    author_email='fixeria@osmocom.org',
+    description='DebugMux client for [Sony] Ericsson phones and modems',
+    packages=['sedbgmux', 'sedbgmux.io', 'sedbgmux.ch'],
+    install_requires=[
+        'construct',
+        'pyserial',
+        'crcmod',
+        'cmd2 >= 2.0.0',
+    ],
+    extras_require={
+        # sedbgmux-dump.py optionally requires pyshark
+        'btpcap' : ['pyshark'],
+    },
+    scripts=[
+        'sedbgmux-shell.py',
+        'sedbgmux-dump.py',
+    ]
+)