profiler: flush after writing the profiler output
Otherwise, the profiler output might only partially appears until the next flush
of the buffer. Since profiling often happens for long operation, the next flush
can be a long time away.
# Oxidized Mercurial
This project provides a Rust implementation of the Mercurial (`hg`)
version control tool.
Under the hood, the project uses
[PyOxidizer](https://github.com/indygreg/PyOxidizer) to embed a Python
interpreter in a binary built with Rust. At run-time, the Rust `fn main()`
is called and Rust code handles initial process startup. An in-process
Python interpreter is started (if needed) to provide additional
functionality.
# Building
First, acquire and build a copy of PyOxidizer; you probably want to do this in
some directory outside of your clone of Mercurial:
$ git clone https://github.com/indygreg/PyOxidizer.git
$ cd PyOxidizer
$ cargo build --release
Then build this Rust project using the built `pyoxidizer` executable:
$ /path/to/pyoxidizer/target/release/pyoxidizer build --release
If all goes according to plan, there should be an assembled application
under `build/<arch>/release/app/` with an `hg` executable:
$ build/x86_64-unknown-linux-gnu/release/app/hg version
Mercurial Distributed SCM (version 5.3.1+433-f99cd77d53dc+20200331)
(see https://mercurial-scm.org for more information)
Copyright (C) 2005-2020 Olivia Mackall and others
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# Running Tests
To run tests with a built `hg` executable, you can use the `--with-hg`
argument to `run-tests.py`. But there's a wrinkle: many tests run custom
Python scripts that need to `import` modules provided by Mercurial. Since
these modules are embedded in the produced `hg` executable, a regular
Python interpreter can't access them! To work around this, set `PYTHONPATH`
to the Mercurial source directory. e.g.:
$ cd /path/to/hg/src/tests
$ PYTHONPATH=`pwd`/.. python3.9 run-tests.py \
--with-hg `pwd`/../rust/hgcli/build/x86_64-unknown-linux-gnu/release/app/hg