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Handle absent lzma library #1318

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Merged
merged 3 commits into from
Sep 15, 2024
Merged

Handle absent lzma library #1318

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8b639b9
Handle absent lzma library
stephenfin Aug 19, 2024
ff46021
Merge branch 'master' into missing-lzma
tleonhardt Sep 13, 2024
63848b9
Refactored Cmd._initialize_history() to handle different exception ty…
kmvanbrunt Sep 13, 2024
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24 changes: 20 additions & 4 deletions cmd2/cmd2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4813,7 +4813,12 @@ def _initialize_history(self, hist_file: str) -> None:
to this file when the application exits.
"""
import json
import lzma
try:
import lzma
bz2 = None
except ModuleNotFoundError: # pragma: no cover
lzma = None
import bz2

self.history = History()
# with no persistent history, nothing else in this method is relevant
Expand Down Expand Up @@ -4841,7 +4846,10 @@ def _initialize_history(self, hist_file: str) -> None:
try:
with open(hist_file, 'rb') as fobj:
compressed_bytes = fobj.read()
history_json = lzma.decompress(compressed_bytes).decode(encoding='utf-8')
if lzma is not None:
history_json = lzma.decompress(compressed_bytes).decode(encoding='utf-8')
else:
history_json = bz2.decompress(compressed_bytes).decode(encoding='utf-8')
self.history = History.from_json(history_json)
except FileNotFoundError:
# Just use an empty history
Expand Down Expand Up @@ -4879,15 +4887,23 @@ def _initialize_history(self, hist_file: str) -> None:

def _persist_history(self) -> None:
"""Write history out to the persistent history file as compressed JSON"""
import lzma
try:
import lzma
bz2 = None
except ModuleNotFoundError: # pragma: no cover
lzma = None
import bz2

if not self.persistent_history_file:
return

self.history.truncate(self._persistent_history_length)
try:
history_json = self.history.to_json()
compressed_bytes = lzma.compress(history_json.encode(encoding='utf-8'))
if lzma is not None:
compressed_bytes = lzma.compress(history_json.encode(encoding='utf-8'))
else:
compressed_bytes = bz2.compress(history_json.encode(encoding='utf-8'))

with open(self.persistent_history_file, 'wb') as fobj:
fobj.write(compressed_bytes)
Expand Down
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