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Diffstat (limited to 'docs/code_style.rst')
| -rw-r--r-- | docs/code_style.rst | 87 |
1 files changed, 42 insertions, 45 deletions
diff --git a/docs/code_style.rst b/docs/code_style.rst index 62800b5b3e..e3ca626bfd 100644 --- a/docs/code_style.rst +++ b/docs/code_style.rst @@ -1,70 +1,67 @@ -- Everything should comply with PEP8. Code should pass - ``pep8 --max-line-length=100`` without any warnings. +# Code Style -- **Indenting**: +The Synapse codebase uses a number of code formatting tools in order to +quickly and automatically check for formatting (and sometimes logical) errors +in code. - - NEVER tabs. 4 spaces to indent. +The necessary tools are detailed below. - - follow PEP8; either hanging indent or multiline-visual indent depending - on the size and shape of the arguments and what makes more sense to the - author. In other words, both this:: +## Formatting tools - print("I am a fish %s" % "moo") +The Synapse codebase uses [black](https://pypi.org/project/black/) as an +opinionated code formatter, ensuring all comitted code is properly +formatted. - and this:: +First install ``black`` with:: - print("I am a fish %s" % - "moo") + pip install --upgrade black - and this:: +Have ``black`` auto-format your code (it shouldn't change any +functionality) with:: - print( - "I am a fish %s" % - "moo", - ) + black . --exclude="\.tox|build|env" - ...are valid, although given each one takes up 2x more vertical space than - the previous, it's up to the author's discretion as to which layout makes - most sense for their function invocation. (e.g. if they want to add - comments per-argument, or put expressions in the arguments, or group - related arguments together, or want to deliberately extend or preserve - vertical/horizontal space) +- **flake8** -- **Line length**: + ``flake8`` is a code checking tool. We require code to pass ``flake8`` before being merged into the codebase. - Max line length is 79 chars (with flexibility to overflow by a "few chars" if - the overflowing content is not semantically significant and avoids an - explosion of vertical whitespace). + Install ``flake8`` with:: - Use parentheses instead of ``\`` for line continuation where ever possible - (which is pretty much everywhere). + pip install --upgrade flake8 -- **Naming**: + Check all application and test code with:: - - Use camel case for class and type names - - Use underscores for functions and variables. + flake8 synapse tests -- Use double quotes ``"foo"`` rather than single quotes ``'foo'``. +- **isort** + + ``isort`` ensures imports are nicely formatted, and can suggest and + auto-fix issues such as double-importing. -- **Blank lines**: + Install ``isort`` with:: - - There should be max a single new line between: + pip install --upgrade isort - - statements - - functions in a class + Auto-fix imports with:: - - There should be two new lines between: + isort -rc synapse tests - - definitions in a module (e.g., between different classes) + ``-rc`` means to recursively search the given directories. -- **Whitespace**: +It's worth noting that modern IDEs and text editors can run these tools +automatically on save. It may be worth looking into whether this +functionality is supported in your editor for a more convenient development +workflow. It is not, however, recommended to run ``flake8`` on save as it +takes a while and is very resource intensive. - There should be spaces where spaces should be and not where there shouldn't - be: +## General rules - - a single space after a comma - - a single space before and after for '=' when used as assignment - - no spaces before and after for '=' for default values and keyword arguments. +- **Naming**: + + - Use camel case for class and type names + - Use underscores for functions and variables. + +- Use double quotes ``"foo"`` rather than single quotes ``'foo'``. - **Comments**: should follow the `google code style <http://google.github.io/styleguide/pyguide.html?showone=Comments#Comments>`_. @@ -76,7 +73,7 @@ - **Imports**: - - Prefer to import classes and functions than packages or modules. + - Prefer to import classes and functions rather than packages or modules. Example:: |