1
1
============================
2
Guidelines for modifying bzr
2
guidelines for modifying bzr
3
3
============================
7
(The current version of this document is available in the file ``HACKING``
8
in the source tree, or at http://bazaar-ng.org/hacking.html)
13
5
* New functionality should have test cases. Preferably write the
14
6
test before writing the code.
16
8
In general, you can test at either the command-line level or the
17
9
internal API level. Choose whichever is appropriate: if adding a
18
10
new command, or a new command option, then call through run_bzr().
19
It is not necessary to do both. Tests that test the command line level
20
are appropriate for checking the UI behaves well - bug fixes and
21
core improvements should be tested closer to the code that is doing the
22
work. Command line level tests should be placed in 'blackbox.py'.
11
It is not necessary to do both.
24
13
* Before fixing a bug, write a test case so that it does not regress.
31
20
function runs. Import statements have a cost, so try to make sure
32
21
they don't run inside hot functions.
23
* Please write PEP-8__ compliant code.
25
One often-missed requirement is that the first line of docstrings
26
should be a self-contained one-sentence summary.
28
__ http://www.python.org/peps/pep-0008.html
34
30
* Module names should always be given fully-qualified,
35
31
i.e. ``bzrlib.hashcache`` not just ``hashcache``.
40
If you change the behaviour of an API in an incompatible way, please
41
be sure to change its name as well. For instance, if I add a keyword
42
parameter to branch.commit - that's fine. On the other hand, if I add
43
a keyword parameter to branch.commit which is a *required* transaction
44
object, I should rename the api - i.e. to 'branch.commit_transaction'.
46
This will prevent users of the old api getting surprising results.
47
Instead, they will get an Attribute error as the api is missing, and
48
will know to update their code. If in doubt, just ask on #bzr.
67
Functions, methods, classes and modules should have docstrings
68
describing how they are used.
70
The first line of the docstring should be a self-contained sentence.
72
For the special case of Command classes, this acts as the user-visible
73
documentation shown by the help command.
75
The docstrings should be formatted as reStructuredText_ (like this
76
document), suitable for processing using the epydoc_ tool into HTML
79
.. _reStructuredText: http://docutils.sourceforge.net/rst.html
80
.. _epydoc: http://epydoc.sourceforge.net/
87
Please write PEP-8__ compliant code.
89
One often-missed requirement is that the first line of docstrings
90
should be a self-contained one-sentence summary.
92
__ http://www.python.org/peps/pep-0008.html
99
Functions, methods or members that are in some sense "private" are given
100
a leading underscore prefix. This is just a hint that code outside the
101
implementation should probably not use that interface.
103
We prefer class names to be concatenated capital words (``TestCase``)
104
and variables, methods and functions to be lowercase words joined by
105
underscores (``revision_id``, ``get_revision``).
107
For the purposes of naming some names are treated as single compound
108
words: "filename", "revno".
110
Consider naming classes as nouns and functions/methods as verbs.
116
``revision_id`` not ``rev_id`` or ``revid``
118
Functions that transform one thing to another should be named ``x_to_y``
119
(not ``x2y`` as occurs in some old code.)
165
92
For example, tests for merge3 in bzrlib belong in bzrlib/tests/test_merge3.py.
170
96
Currently, bzr selftest is used to invoke tests.
171
97
You can provide a pattern argument to run a subset. For example,
172
to run just the whitebox tests, run::
174
bzr selftest -v whitebox
177
Errors and exceptions
178
=====================
187
Integer identifier for a revision on the main line of a branch.
188
Revision 0 is always the null revision; others are 1-based
189
indexes into the branch's revision history.
98
to run just the whitebox tests, run bzr selftest --pattern .*whitebox.*
added
removed
HACKING
