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AdGuardHome Developer Guidelines

As of December 2020, this document is partially a work-in-progress, but should still be followed. Some of the rules aren't enforced as thoroughly or remain broken in old code, but this is still the place to find out about what we want our code to look like.

The rules are mostly sorted in the alphabetical order.

Git

Call your branches either NNNN-fix-foo (where NNNN is the ID of the GitHub issue you worked on in this branch) or just fix-foo if there was no GitHub issue.
Follow the commit message header format:
```
pkg: fix the network error logging issue
```
Where pkg is the package where most changes took place. If there are several such packages, or the change is top-level only, write all.
Keep your commit messages, including headers, to eighty (80) columns.
Only use lowercase letters in your commit message headers. The rest of the message should follow the plain text conventions below.

The only exceptions are direct mentions of identifiers from the source code and filenames like HACKING.md.

Go

Not Golang, not GO, not GOLANG, not GoLang. It is Go in natural language, golang for others.

— @rakyll

Code And Naming

Avoid goto.
Avoid init and use explicit initialization functions instead.
Avoid new, especially with structs.
Constructors should validate their arguments and return meaningful errors. As a corollary, avoid lazy initialization.
Don't use naked returns.
Don't use underscores in file and package names, unless they're build tags or for tests. This is to prevent accidental build errors with weird tags.
Don't write code with more than four (4) levels of indentation. Just like Linus said, plus an additional level for an occasional error check or struct initialization.
Eschew external dependencies, including transitive, unless absolutely necessary.

Name benchmarks and tests using the same convention as examples. For example:

func TestFunction(t *testing.T) { /* … */ }
func TestFunction_suffix(t *testing.T) { /* … */ }
func TestType_Method(t *testing.T) { /* … */ }
func TestType_Method_suffix(t *testing.T) { /* … */ }

Name parameters in interface definitions:

type Frobulator interface {
        Frobulate(f Foo, b Bar) (r Result, err error)
}

Name the deferred errors (e.g. when closing something) cerr.
No shadowing, since it can often lead to subtle bugs, especially with errors.
Prefer constants to variables where possible. Reduce global variables. Use constant errors instead of errors.New.

Unused arguments in anonymous functions must be called _:

v.onSuccess = func(_ int, msg string) {
        // …
}

Use linters.
Use named returns to improve readability of function signatures.
Write logs and error messages in lowercase only to make it easier to grep logs and error messages without using the -i flag.

Commenting

See also the Text, Including Comments section below.
Document everything, including unexported top-level identifiers, to build a habit of writing documentation.
Don't put identifiers into any kind of quotes.
Put comments above the documented entity, not to the side, to improve readability.

When a method implements an interface, start the doc comment with the standard template:

// Foo implements the Fooer interface for *foo.
func (f *foo) Foo() {
        // …
}

When the implemented interface is unexported:

// Unwrap implements the hidden wrapper interface for *fooError.
func (err *fooError) Unwrap() (unwrapped error) {
        // …
}

Formatting

Add an empty line before break, continue, fallthrough, and return, unless it's the only statement in that block.
Use gofumpt --extra -s.

Write slices of struct like this:

ts := []T{{
        Field: Value0,
        // …
}, {
        Field: Value1,
        // …
}, {
        Field: Value2,
        // …
}}

Markdown

TODO(a.garipov): Define our Markdown conventions.

Shell Scripting

Avoid bashisms and GNUisms, prefer POSIX features only.
Prefer 'raw strings' to "double quoted strings" whenever possible.
Put spaces within $( cmd ), $(( expr )), and { cmd; }.
Put utility flags in the ASCII order and don't group them together. For example, ls -1 -A -q.
snake_case, not camelCase for variables. kebab-case for filenames.
UPPERCASE names for external exported variables, lowercase for local, unexported ones.
Use set -e -f -u and also set -x in verbose mode.
Use readonly liberally.
Use the "$var" form instead of the $var form, unless word splitting is required.
When concatenating, always use the form with curly braces to prevent accidental bad variable names. That is, "${var}_tmp.txt" and not "$var_tmp.txt". The latter will try to lookup variable var_tmp.
When concatenating, surround the whole string with quotes. That is, use this:
```
dir="${TOP_DIR}/sub"
```
And not this:
```
# Bad!
dir="${TOP_DIR}"/sub
```

Text, Including Comments

End sentences with appropriate punctuation.
Headers should be written with all initial letters capitalized, except for references to variable names that start with a lowercase letter.
Start sentences with a capital letter, unless the first word is a reference to a variable name that starts with a lowercase letter.
Text should wrap at eighty (80) columns to be more readable, to use a common standard, and to allow editing or diffing side-by-side without wrapping.

The only exception are long hyperlinks.
Use U.S. English, as it is the most widely used variety of English in the code right now as well as generally.
Use double spacing between sentences to make sentence borders more clear.
Use the serial comma (a.k.a. Oxford comma) to improve comprehension, decrease ambiguity, and use a common standard.

Write todos like this:

// TODO(usr1): Fix the frobulation issue.

Or, if several people need to look at the code:

// TODO(usr1, usr2): Fix the frobulation issue.

YAML

TODO(a.garipov): Define naming conventions for schema names in our OpenAPI YAML file. And just generally OpenAPI conventions.
TODO(a.garipov): Find a YAML formatter or write our own.
All strings, including keys, must be quoted. Reason: the NO-rway Law.
Indent with two (2) spaces. YAML documents can get pretty deeply-nested.

No extra indentation in multiline arrays:

'values':
- 'value-1'
- 'value-2'
- 'value-3'

Prefer single quotes for strings to prevent accidental escaping, unless escaping is required or there are single quotes inside the string (e.g. for GitHub Actions).
Use > for multiline strings, unless you need to keep the line breaks.

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