GeezerVison

GH-157165) (#157173)

gh-123018: Keep the libedit history file header when truncating (GH-157165)

libedit's history_truncate_file() keeps the last N lines of the file,
which drops the "_HiStOrY_V2_" header line that its own write_history()
emits and that its read_history() requires.  So on a libedit build,
readline.write_history_file() or readline.append_history_file() after
readline.set_history_length() produced a file that
readline.read_history_file() rejected with EINVAL.

Under the libedit emulation, truncate the file ourselves and keep the
header, resolving the default "~/.history" the same way libedit does.
Apple's libedit fork already preserves the header, so the workaround is
not compiled on macOS.
(cherry picked from commit 2638785)

Co-authored-by: Gregory P. Smith <[email protected]>

* main: (158 commits)
  pythongh-156924: Try reifying lazy imports in `ForwarRef.evaluate()` (python#156940)
  pythongh-156233: Fix typos and code snippet errors in the docs (python#156475)
  pythongh-156837: Refer to yield expressions in generator function definitions (pythonGH-156863)
  pythongh-155292: Skip updating unicodedata with mismatched interpreter (pythonGH-157066)
  pythongh-157170: Document the scope of global curses settings (pythonGH-157207)
  pythongh-155966: Correct handling of `math.tanpi` poles (python#155980)
  pythongh-157170: Restore use_env() after test_use_prescr_screen in test_curses (pythonGH-157171)
  pythongh-156910: fix deadlock in type_set_abstractmethods under free-threading (python#156948)
  pythongh-155648: Write the empty and placeholder IDLE tests (python#156260)
  pythongh-153569: centralize formatted-string state and source spans (python#156484)
  pythongh-157137: Mark the PEP 820 soft deprecations as 3.15, not `next` (python#157138)
  pythongh-152433: Use regular LoadLibrary in UWP for Windows system libs (pythonGH-156972)
  pythongh-121617: Fix Py_CLEAR() memcpy in C++: replace NULL with _Py_NULL (python#157188)
  pythongh-157135: Fix documentation errors in the `math.atan{2}pi` functions (python#157136)
  pythongh-121617: Fix Py_CLEAR() in C++: replace NULL with _Py_NULL (python#157067)
  pythongh-156774: Speed up pdb startup with asyncio guard (python#156775)
  pythongh-156109: Allow static, non-framework iOS builds (python#156110)
  pythongh-156780: Emscripten: add missing EM_JS_DEPS (python#156798)
  pythongh-152936: Make privileged functions available on Android (python#152977)
  pythongh-123018: Keep the libedit history file header when truncating (pythonGH-157165)
  ...

…pythonGH-157165)

libedit's history_truncate_file() keeps the last N lines of the file,
which drops the "_HiStOrY_V2_" header line that its own write_history()
emits and that its read_history() requires.  So on a libedit build,
readline.write_history_file() or readline.append_history_file() after
readline.set_history_length() produced a file that
readline.read_history_file() rejected with EINVAL.

Under the libedit emulation, truncate the file ourselves and keep the
header, resolving the default "~/.history" the same way libedit does.
Apple's libedit fork already preserves the header, so the workaround is
not compiled on macOS.

…pythonGH-157165)

libedit's history_truncate_file() keeps the last N lines of the file,
which drops the "_HiStOrY_V2_" header line that its own write_history()
emits and that its read_history() requires.  So on a libedit build,
readline.write_history_file() or readline.append_history_file() after
readline.set_history_length() produced a file that
readline.read_history_file() rejected with EINVAL.

Under the libedit emulation, truncate the file ourselves and keep the
header, resolving the default "~/.history" the same way libedit does.
Apple's libedit fork already preserves the header, so the workaround is
not compiled on macOS.

GH-157165) (#157172)

gh-123018: Keep the libedit history file header when truncating (GH-157165)

libedit's history_truncate_file() keeps the last N lines of the file,
which drops the "_HiStOrY_V2_" header line that its own write_history()
emits and that its read_history() requires.  So on a libedit build,
readline.write_history_file() or readline.append_history_file() after
readline.set_history_length() produced a file that
readline.read_history_file() rejected with EINVAL.

Under the libedit emulation, truncate the file ourselves and keep the
header, resolving the default "~/.history" the same way libedit does.
Apple's libedit fork already preserves the header, so the workaround is
not compiled on macOS.
(cherry picked from commit 2638785)

Co-authored-by: Gregory P. Smith <[email protected]>