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Good commit messages serve at least three important purposes:
- To speed up the reviewing process.
- To help writing good release notes.
- To help the future maintainers of CP2K (it could be you!), say five years into the future, to find out why a particular change was made to the code or why a specific feature was added.
Structure your commit message like this:
Based on: https://git-scm.com/book/ch5-2.html
short summary of changes (50 chars or less) More detailed explanatory text, if necessary. Wrap it to about 72 characters or so. In some contexts, the first line is treated as the subject of an email and the rest of the text as the body. The blank line separating the summary from the body is critical (unless you omit the body entirely); tools like rebase can get confused if you run the two together. Further paragraphs come after blank lines. - Bullet points are okay, too - Typically a hyphen or asterisk is used for the bullet, preceded by a single space, with blank lines in between, but conventions vary here You can specify tags to resolve an issue directly when the commit gets merged, like so: Fixes: #45
- Write the summary line and description of what you have done in the imperative mode, that is as if you were commanding someone.
- Start the line with "Fix", "Add", "Change" instead of "Fixed", "Added", "Changed".
- Possibly prefix the summary with "category: " where category can be a folder like
tests, a subsystem like
hfxor even a specific file like
- Always leave the second line blank.
- Line break the commit message (to make the commit message readable without having to scroll horizontally in
- Use the body to explain what and why vs. how
- Don't end the summary line with a period - it's a title and titles don't end with a period.
- If it seems difficult to summarize what your commit does, it may be because it includes several logical changes or bug fixes, and are better split up into several commits using
git add -por
git add -i.