Commit 84a7b6f4 authored by Andre Klapper's avatar Andre Klapper 💬

Update HACKING file. Fixes bug #447689

parent 07eedfd7
1 Patch guidelines
This section lists some guidelines for writing a good patch which is
more likely to be accepted.
Any new features or large scale work should first be discussed on the
evolution-hackers list first. This will ensure the idea fits in the
direction we wish to take Evolution, and also that the effort is not
duplicated. See section 3 for details on the mailing lists.
1.1 Patch basics
o The patch should apply cleanly at the time it is made.
o It must compile once applied.
o It must not generate any more compile time warnings than were
already there. This may be platform dependent so simply do your
o It must conform to C89/C90 (ANSI/ISO C), and build with gcc using
the default compile flags.
The primary trap is that in C99 you may define variables anywhere in
the code, in C89 they must be declared in a declaration block which
follows any block start '{'.
If you wish to ensure the code is C89, try the following.
From the gcc manual page:
"To select
this standard in GCC, use one of the options `-ansi', `-std=c89' or
`-std=iso9899:1990'; to obtain all the diagnostics required by the
standard, you should also specify `-pedantic'" ...
You may actually have to use '-std=gnu89' if libraries have taken
advantage of gcc extensions and where not compiled similarly, as the
above options will disable all gnu extensions.
[FIXME: Add the same option for Forte here]
o It should not add any extra debug printing by default, unless the
patch is specifically to add extra debug printing.
o It should not use any gcc extensions, except where they are properly
checked for and not used with other compilers. glib provides some
of these features as portable macros and should be used when they
cover the required functionality.
o It must include ChangeLog entries in the appropriate ChangeLog for
the file modified. Use emacs, C-4-a will start a properly formatted
ChangeLog entry in the correct ChangeLog file automatically.
o If it is from a bug report, it must reference the bug number, and if
it isn't in the gnome bugzilla, it must reference the bug system from
whence it came.
1.1 GUI changes
If the change requires non-trivial user interface changes, then they
will have to be discussed and approved on the evolution-hackers list
first. This is highly recommended before embarking on any UI work, or
large scale work in general. The Gnome HIG document is the place to
start on any UI changes or additions.
1.2 Translated string changes
Any changes to translated strings in a stable release must be
discussed on the hackers list (see section 3), and/or as part of the
patch submission. There must be very good reasons for changing the
strings in this case.
1.3 Coding style
Generally the coding style employed matches the "Linux Kernel" style,
that is, basically K&R style indenting with 8 space tabs. Tabs should
be used rather than space characters. Reformatting of otherwise
unchanged code is not acceptable. Editors should have any automatic
reformatting features disabled.
K&R style indenting puts braces on the same line. The opening
parenthesis of a function call or conditional statement should be on
the same line as the function. "else" "} else" and "} else {" must
always occur on lines by themselves.
A single blank line should follow {} blocks (if not immediately
followed by the close of another block), and conditional statements,
and be used to separate logical groups of statements in the same
A single blank line only should separate functions, and other
structures at the top level of the file (i.e. outside functions). The
same rule applies to variable declarations at the start of a block.
An example of the most-developer-preferred formatting:
the_function (int frank)
int a = 1;
if (a == frank) {
a = foo (a);
} else {
do {
a = bob (frank) + a;
} until (a == frank);
frank = a;
return (TheType) a;
Procedures that should be followed when submitting patches for
Evolution are available on
Where there are slight stylistic differences, the style in the
surrounding code should be followed.
Further information:
1.3.1 Object casts
You can either use C style casts, or Gtk style casts. Note that Gtk
style casts can add significant execution overhead, which is not
adding any extra checking. e.g. if arguments have already been
type-checked by preconditions. Putting a space between a cast and a
variable is optional, but preferred by most of the developers.
1.3.2 Preconditions
External api entry points should have preconditions (g_return_if_fail,
etc), although their use varies from case to case. Internal entry
points and/or when you are guaranteed the type has already been
checked, are unecessary. Object initialisation and other virtual
method invocations are considered internal entry points.
1.3.3 Line lengths
Do not expend effort and resort to unreadable formatting merely to fit
any long lines into 80 column widths. We use 8 space tabs, and
because of the lack of namespacing other than extending the function
name, many of the function and type names are too long for this to be
practical. We now all uses high resolution displays, and not
circa-80's VT100 terminals!
On the other hand, lines should generally not exceed 100 characters,
and absolutely not exceed 160 characters. If your tab nesting is too
deep you probably have a poor design that needs rethinking.
1.4 Design
This is a tricky issue to document, but the design of new code should
`fit' with the existing design of the relevent module. It should at
the very least, be no worse.
Code should not cross existing abstraction boundaries or attempt
to remove or work around them, if required the existing design may
need adjustment.
Type and method names should follow the existing practice in the
surrounding code. Method arguments should follow the same order as
related methods, and should use the same names for matching
Per file, static class globals are ok, true globals may be ok, but
should be used sparingly. Use 'i' for a loop variable, if that's all
it is, don't use 'the_current_index'. etc.
If in doubt, ask on the lists.
2. Patch submission guidelines
This section outlines procedures that should be followed when
submitting patches for Evolution.
The patch must simply be attached to an appropriate, open bug on
For discussion of the patch, or to expediate processing of the patch,
an email may be sent to the evolution-patches list. See the mailing
lists section for more information. You may attach patches when
sending to this list for discussion.
Any non-trival patches (patches of more than 1 or 2 changed lines in
more than 5 isolated locations) also require copyright assignment.
See for
If you follow the guidelines listed here, you should generally expect
a response within 2 working days. If you re-send the same patch
repeatedly, you will more likely receive less attention. Do not
re-send the same patch repeatedly.
2.1 Subject Lines
1.1 Subject Lines
If the patch addresses a specific bug in, then the
bug number must be included in the subject line, preferably near the
......@@ -240,34 +57,3 @@ Generally, any patch to the stable branch from non-core developers
must address a specific bug in The patch should
also be attached to the bug in question. The patch must not be
applied until reviewed.
3 Mailing lists
3.1 Evolution Hackers
If you wish to discuss patches before they are submitted, or ideas
before you start to work on them, do it on the evolution-hackers list,
which may be subscribed and viewed at
This is a low-volume list (5-10 posts per day on average).
Some patches may be discussed here to get a wider audience, although
once a patch has been made it should generally be discussed on
evolution-patches. Large posts are blocked, so they should be sent to
the patches list intsead, or reference resources elsewhere.
Feature requests, bug reports, and other user related discussions,
without the intention to write code to address them, will be ignored.
3.2 Evolution Patches
The patch discussion list evolution-patches may be subscribed and
viewed at
`'. Once a
patch has been written, it may be submitted here for discussion, as
well as final approval.
Patches may be sent to this list as attachments for discussion.
Any non-patch related postings to this list will be ignored.
Markdown is supported
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment