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@ -1,30 +1,12 @@
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# Contributing to sway
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# Contributing to sway
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Contributing just involves sending a pull request. You will probably be more
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Contributing just involves sending a pull request. You will probably be more
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successful with your contribution if you visit the [IRC
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successful with your contribution if you visit
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channel](http://webchat.freenode.net/?channels=sway-devel&uio=d4) upfront and discuss
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[#sway-devel](https://webchat.freenode.net/?channels=sway-devel) on
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your plans.
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irc.freenode.net upfront and discuss your plans.
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## Release Cycle
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Note: rules are made to be broken. Adjust or ignore any/all of these as you see
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fit, but be prepared to justify it to your peers.
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The master branch of sway is always working towards becoming the next release.
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That release will go through each of these three stages:
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**In development**: during this time the release lives in the master branch and
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is considered unstable. All pull requests merged during this time will land in
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the release. Only developers are encouraged to run this version.
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**Release candidate**: at some point (usually when development is fairly quiet),
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SirCmpwn will announce an upcoming release candidate, often 2 weeks in
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advance. When the two weeks are up, a branch is cut (i.e. 0.8-rc1) and from
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that point only bugfixes land in this branch. Each week, if bugfixes landed
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during the week, a new RC is cut. During the RC phase, more adventurous users
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are encouraged to upgrade and start looking for and reporting bugs (especially
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in new features).
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**Stable release**: when no substantial changes are merged into an RC for one
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week, it's released as a new stable version of sway. At this point, all users
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are encouraged to upgrade.
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## Pull Requests
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## Pull Requests
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@ -33,34 +15,44 @@ don't, however, allow me to make a suggestion: feature branches pulled from
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upstream. Try this:
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upstream. Try this:
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1. Fork sway
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1. Fork sway
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2. Clone your fork
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2. `git clone https://github.com/username/sway && cd sway`
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3. git remote add upstream git://github.com/swaywm/sway.git
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3. `git remote add upstream https://github.com/swaywm/sway`
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You only need to do this once. You're never going to use your fork's master
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You only need to do this once. You're never going to use your fork's master
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branch. Instead, when you start working on a feature, do this:
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branch. Instead, when you start working on a feature, do this:
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1. git fetch upstream
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1. `git fetch upstream`
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2. git checkout -b add-so-and-so-feature upstream/master
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2. `git checkout -b add-so-and-so-feature upstream/master`
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3. work
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3. Add and commit your changes
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4. git push -u origin add-so-and-so-feature
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4. `git push -u origin add-so-and-so-feature`
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5. Make pull request from your feature branch
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5. Make a pull request from your feature branch
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When you submit your pull request, your commit log should do most of the talking
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when it comes to describing your changes and their motivation. In addition to
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this, your pull request's comments will ideally include a test plan that the
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reviewers can use to (1) demonstrate the problem on master, if applicable and
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(2) verify that the problem no longer exists with your changes applied (or that
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your new features work correctly). Document all of the edge cases you're aware
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of so we can adequately test them - then verify the test plan yourself before
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submitting.
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## Commit Messages
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## Commit Messages
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Please strive to write good commit messages. Here's some guidelines to follow:
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Please strive to write good commit messages. Here's some guidelines to follow:
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The first line should be limited to 50 characters and should be a sentence that
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The first line should be limited to 50 characters and should be a sentence that
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completes the thought [When applied, this commit will...] "Implement cmd_move"
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completes the thought [When applied, this commit will...] *"Implement
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or "Fix #742" or "Improve performance of arrange_windows on ARM" or similar.
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cmd_move"* or *"Fix #742"* or *"Improve performance of arrange_windows on ARM"*
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or similar.
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The subsequent lines should be seperated from the subject line by a single
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The subsequent lines should be separated from the subject line by a single
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blank line, and include optional details. In this you can give justification
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blank line, and include optional details. In this you can give justification
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for the change, [reference Github
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for the change, [reference Github
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issues](https://help.github.com/articles/closing-issues-via-commit-messages/),
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issues](https://help.github.com/articles/closing-issues-via-commit-messages/),
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or explain some of the subtler details of your patch. This is important because
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or explain some of the subtler details of your patch. This is important because
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when someone finds a line of code they don't understand later, they can use the
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when someone finds a line of code they don't understand later, they can use the
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`git blame` command to find out what the author was thinking when they wrote
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`git blame` command to find out what the author was thinking when they wrote
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it. It's also easier to review your pull requests if they're seperated into
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it. It's also easier to review your pull requests if they're separated into
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logical commits that have good commit messages and justify themselves in the
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logical commits that have good commit messages and justify themselves in the
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extended commit description.
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extended commit description.
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@ -68,157 +60,178 @@ As a good rule of thumb, anything you might put into the pull request
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description on Github is probably fair game for going into the extended commit
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description on Github is probably fair game for going into the extended commit
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message as well.
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message as well.
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## Coding Style
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See [here](https://chris.beams.io/posts/git-commit/) for more details.
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Sway is written in C. The style guidelines is [kernel
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## Code Review
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style](https://www.kernel.org/doc/Documentation/process/coding-style.rst), but all braces go
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on the same line (*"but K&R says so!" is a silly way of justifying something*).
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When your changes are submitted for review, one or more core committers will
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Some points to note:
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look over them. Smaller changes might be merged with little fanfare, but larger
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changes will typically see review from several people. Be prepared to receive
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* Do not use typedefs unless you have a good reason
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some feedback - you may be asked to make changes to your work. Our code review
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* Do not use macros unless you have a *really* good reason
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process is:
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* Align `case` with `switch`
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* Tabs, not spaces
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1. **Triage** the pull request. Do the commit messages make sense? Is a test
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* `char *pointer` - note position of `*`
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plan necessary and/or present? Add anyone as reviewers that you think should
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* Use logging with reckless abandon
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be there (using the relevant GitHub feature, if you have the permissions, or
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* Always include braces for if/for/while/etc, even for one-liners
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with an @mention if necessary).
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2. **Review** the code. Look for code style violations, naming convention
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An example of well formatted code:
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violations, buffer overflows, memory leaks, logic errors, non-portable code
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(including GNU-isms), etc. For significant changes to the public API, loop in
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```C
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a couple more people for discussion.
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#include <stdio.h>
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3. **Execute** the test plan, if present.
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#include <stdlib.h>
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4. **Merge** the pull request when all reviewers approve.
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#include "log.h"
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5. **File** follow-up tickets if appropriate.
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#include "example.h"
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## Style Reference
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struct foobar {
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char *foo;
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Sway is written in C with a style similar to the [kernel
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int bar;
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style](https://www.kernel.org/doc/Documentation/process/coding-style.rst), but
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long baz;
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with a few notable differences.
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}; // Do not typedef without a good reason
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Try to keep your code conforming to C11 and POSIX as much as possible, and do
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int main(int argc, const char **argv) {
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not use GNU extensions.
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if (argc != 4) {
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sway_abort("Do not run this program manually. See man 5 sway and look for output options.");
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### Brackets
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}
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Brackets always go on the same line, including in functions.
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if (!registry->desktop_shell) {
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Always include brackets for if/while/for, even if it's a single statement.
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sway_abort("swaybg requires the compositor to support the desktop-shell extension.");
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```c
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void function(void) {
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if (condition1) {
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do_thing1();
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}
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}
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int desired_output = atoi(argv[1]);
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if (condition2) {
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sway_log(WLR_INFO, "Using output %d of %d", desired_output, registry->outputs->length);
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do_thing2();
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int i;
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struct output_state *output = registry->outputs->items[desired_output];
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struct window *window = window_setup(registry, 100, 100, false);
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if (!window) {
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sway_abort("Failed to create surfaces.");
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}
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window->width = output->width;
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window->height = output->height;
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desktop_shell_set_background(registry->desktop_shell, output->output, window->surface);
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list_add(surfaces, window);
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cairo_surface_t *image = cairo_image_surface_create_from_png(argv[2]);
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double width = cairo_image_surface_get_width(image);
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double height = cairo_image_surface_get_height(image);
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const char *scaling_mode_str = argv[3];
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enum scaling_mode scaling_mode;
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if (strcmp(scaling_mode_str, "stretch") == 0) {
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scaling_mode = SCALING_MODE_STRETCH;
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} else if (strcmp(scaling_mode_str, "fill") == 0) {
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scaling_mode = SCALING_MODE_FILL;
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} else if (strcmp(scaling_mode_str, "fit") == 0) {
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scaling_mode = SCALING_MODE_FIT;
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} else if (strcmp(scaling_mode_str, "center") == 0) {
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scaling_mode = SCALING_MODE_CENTER;
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} else if (strcmp(scaling_mode_str, "tile") == 0) {
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scaling_mode = SCALING_MODE_TILE;
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} else {
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} else {
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sway_abort("Unsupported scaling mode: %s", scaling_mode_str);
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do_thing3();
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}
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}
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}
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```
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for (i = 0; i < surfaces->length; ++i) {
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### Indentation
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struct window *window = surfaces->items[i];
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if (window_prerender(window) && window->cairo) {
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Indentations are a single tab.
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switch (scaling_mode) {
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case SCALING_MODE_STRETCH:
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For long lines that need to be broken, the continuation line should be indented
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cairo_scale(window->cairo,
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with an additional tab.
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(double) window->width / width,
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(double) window->height / height);
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If the line being broken is opening a new block (functions, if, while, etc.),
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cairo_set_source_surface(window->cairo, image, 0, 0);
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the continuation line should be indented with two tabs, so they can't be
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break;
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misread as being part of the block.
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case SCALING_MODE_FILL:
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{
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```c
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double window_ratio = (double) window->width / window->height;
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really_long_function(argument1, argument2, ...,
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double bg_ratio = width / height;
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argument3, argument4);
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if (window_ratio > bg_ratio) {
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if (condition1 && condition2 && ...
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double scale = (double) window->width / width;
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condition3 && condition4) {
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cairo_scale(window->cairo, scale, scale);
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do_thing();
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cairo_set_source_surface(window->cairo, image,
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}
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0,
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```
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(double) window->height/2 / scale - height/2);
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} else {
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Try to break the line in the place which you think is the most appropriate to
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double scale = (double) window->height / height;
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balance the lines.
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cairo_scale(window->cairo, scale, scale);
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cairo_set_source_surface(window->cairo, image,
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### Line Length
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(double) window->width/2 / scale - width/2,
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0);
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Try to keep your lines under 80 columns, but you can go up to 100 if it
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}
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improves readability. Don't break lines indiscriminately, try to find nice
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break;
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breaking points so your code is easy to read.
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}
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case SCALING_MODE_FIT:
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### Names
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{
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double window_ratio = (double) window->width / window->height;
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Global function and type names should be prefixed with `sway_submodule_` (e.g.
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double bg_ratio = width / height;
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`struct sway_output`, `sway_output_destroy`). For static functions and
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types local to a file, the names chosen aren't as important. Static functions
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if (window_ratio > bg_ratio) {
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shouldn't have a `sway_` prefix.
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double scale = (double) window->height / height;
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cairo_scale(window->cairo, scale, scale);
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For include guards, use the header's filename relative to include. Uppercase
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cairo_set_source_surface(window->cairo, image,
|
|
|
|
all of the characters, and replace any invalid characters with an underscore.
|
|
|
|
(double) window->width/2 / scale - width/2,
|
|
|
|
|
|
|
|
0);
|
|
|
|
### Construction/Destruction Functions
|
|
|
|
} else {
|
|
|
|
|
|
|
|
double scale = (double) window->width / width;
|
|
|
|
For functions that are responsible for constructing and destructing an object,
|
|
|
|
cairo_scale(window->cairo, scale, scale);
|
|
|
|
they should be written as a pair of one of two forms:
|
|
|
|
cairo_set_source_surface(window->cairo, image,
|
|
|
|
|
|
|
|
0,
|
|
|
|
* `init`/`finish`: These initialize/deinitialize a type, but are **NOT**
|
|
|
|
(double) window->height/2 / scale - height/2);
|
|
|
|
responsible for allocating it. They should accept a pointer to some
|
|
|
|
}
|
|
|
|
pre-allocated memory (e.g. a member of a struct).
|
|
|
|
break;
|
|
|
|
* `create`/`destroy`: These also initialize/deinitialize, but will return a
|
|
|
|
|
|
|
|
pointer to a `malloc`ed chunk of memory, and will `free` it in `destroy`.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
A destruction function should always be able to accept a NULL pointer or a
|
|
|
|
|
|
|
|
zeroed value and exit cleanly; this simplifies error handling a lot.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Error Codes
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
For functions not returning a value, they should return a (stdbool.h) bool to
|
|
|
|
|
|
|
|
indicated if they succeeded or not.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Macros
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Keep the use of macros to a minimum, especially if a function can do the job. If
|
|
|
|
|
|
|
|
you do need to use them, try to keep them close to where they're being used and
|
|
|
|
|
|
|
|
`#undef` them after.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Example
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
```c
|
|
|
|
|
|
|
|
struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
|
|
|
|
|
|
|
|
struct wlr_backend *backend;
|
|
|
|
|
|
|
|
if (getenv("WAYLAND_DISPLAY") || getenv("_WAYLAND_DISPLAY")) {
|
|
|
|
|
|
|
|
backend = attempt_wl_backend(display);
|
|
|
|
|
|
|
|
if (backend) {
|
|
|
|
|
|
|
|
return backend;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
case SCALING_MODE_CENTER:
|
|
|
|
|
|
|
|
cairo_set_source_surface(window->cairo, image,
|
|
|
|
|
|
|
|
(double) window->width/2 - width/2,
|
|
|
|
|
|
|
|
(double) window->height/2 - height/2);
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
case SCALING_MODE_TILE:
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image);
|
|
|
|
|
|
|
|
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
|
|
|
|
|
|
|
|
cairo_set_source(window->cairo, pattern);
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
default:
|
|
|
|
|
|
|
|
sway_abort("Scaling mode '%s' not implemented yet!", scaling_mode_str);
|
|
|
|
const char *x11_display = getenv("DISPLAY");
|
|
|
|
|
|
|
|
if (x11_display) {
|
|
|
|
|
|
|
|
return wlr_x11_backend_create(display, x11_display);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
cairo_paint(window->cairo);
|
|
|
|
// Attempt DRM+libinput
|
|
|
|
|
|
|
|
|
|
|
|
window_render(window);
|
|
|
|
struct wlr_session *session = wlr_session_create(display);
|
|
|
|
|
|
|
|
if (!session) {
|
|
|
|
|
|
|
|
wlr_log(WLR_ERROR, "Failed to start a DRM session");
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
int gpu = wlr_session_find_gpu(session);
|
|
|
|
|
|
|
|
if (gpu == -1) {
|
|
|
|
|
|
|
|
wlr_log(WLR_ERROR, "Failed to open DRM device");
|
|
|
|
|
|
|
|
goto error_session;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
while (wl_display_dispatch(registry->display) != -1);
|
|
|
|
backend = wlr_multi_backend_create(session);
|
|
|
|
|
|
|
|
if (!backend) {
|
|
|
|
|
|
|
|
goto error_gpu;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
for (i = 0; i < surfaces->length; ++i) {
|
|
|
|
struct wlr_backend *libinput = wlr_libinput_backend_create(display, session);
|
|
|
|
struct window *window = surfaces->items[i];
|
|
|
|
if (!libinput) {
|
|
|
|
window_teardown(window);
|
|
|
|
goto error_multi;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
list_free(surfaces);
|
|
|
|
|
|
|
|
registry_teardown(registry);
|
|
|
|
struct wlr_backend *drm = wlr_drm_backend_create(display, session, gpu);
|
|
|
|
return 0;
|
|
|
|
if (!drm) {
|
|
|
|
|
|
|
|
goto error_libinput;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
wlr_multi_backend_add(backend, libinput);
|
|
|
|
|
|
|
|
wlr_multi_backend_add(backend, drm);
|
|
|
|
|
|
|
|
return backend;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
error_libinput:
|
|
|
|
|
|
|
|
wlr_backend_destroy(libinput);
|
|
|
|
|
|
|
|
error_multi:
|
|
|
|
|
|
|
|
wlr_backend_destroy(backend);
|
|
|
|
|
|
|
|
error_gpu:
|
|
|
|
|
|
|
|
wlr_session_close_file(session, gpu);
|
|
|
|
|
|
|
|
error_session:
|
|
|
|
|
|
|
|
wlr_session_destroy(session);
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
```
|
|
|
|
```
|
|
|
|