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The Python script interpreter imports `pydoc` during initialization, but this
can be
slow in some cases, and doesn't seem to be necessary any more.
This can be slow because pydoc may execute shell commands (for example `xcrun`
on
macOS). The shell commands may have variable performance, depending on their
caches and
search space.
The 2012 bug report for the original commit
(f71a8399997bfdc1ddeeb30c6a8897554a11c382)
says the following:
> "script help" in lldb pipes the help documentation through less(1) but
> there's some
> problem with the key handling and often the keys you'd use to move in less
> (space to
> move down a page, 'q' to quit) are not received by less (they're going to lldb
> instead)
This was resolved at the time by overriding `pydoc`'s pager to be the
`plainpager`
function.
I have manually tested `script help(lldb.SBDebugger)` and found no issues with
the
pager, including using "space" for paging, "/" for searching, and "q" for
quitting.
The presumption is that lldb and/or Python have improved I/O handling that
eliminates
the original problem.
The original bug report gave an ~/.lldbinit workaround:
script import pydoc; pydoc.pager = pydoc.plainpager
Note that calling Python's `help()` will import `pydoc`, but this will only
happen for
users who use `help()` from the `script` command.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D144138
Files:
lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
Index: lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
===================================================================
--- lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
+++ lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
@@ -442,7 +442,7 @@
// do their task
run_string.Clear();
run_string.Printf(
- "run_one_line (%s, 'import lldb.formatters, lldb.formatters.cpp,
pydoc')",
+ "run_one_line (%s, 'import lldb.formatters, lldb.formatters.cpp')",
m_dictionary_name.c_str());
PyRun_SimpleString(run_string.GetData());
run_string.Clear();
@@ -455,7 +455,7 @@
run_string.Clear();
run_string.Printf("run_one_line (%s, 'lldb.debugger_unique_id = %" PRIu64
- "; pydoc.pager = pydoc.plainpager')",
+ "')",
m_dictionary_name.c_str(), m_debugger.GetID());
PyRun_SimpleString(run_string.GetData());
}
Index: lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
===================================================================
--- lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
+++ lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
@@ -442,7 +442,7 @@
// do their task
run_string.Clear();
run_string.Printf(
- "run_one_line (%s, 'import lldb.formatters, lldb.formatters.cpp, pydoc')",
+ "run_one_line (%s, 'import lldb.formatters, lldb.formatters.cpp')",
m_dictionary_name.c_str());
PyRun_SimpleString(run_string.GetData());
run_string.Clear();
@@ -455,7 +455,7 @@
run_string.Clear();
run_string.Printf("run_one_line (%s, 'lldb.debugger_unique_id = %" PRIu64
- "; pydoc.pager = pydoc.plainpager')",
+ "')",
m_dictionary_name.c_str(), m_debugger.GetID());
PyRun_SimpleString(run_string.GetData());
}
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