scalafix
Scalafix lints and fixes scala files
- As there is no prior compilation or semantic db generation, the linting is applied only with built-in syntactic rules
- scalafix arguments related to semantic options can not be used
scalafix documentation
- Version in MegaLinter: 0.11.1
- Visit Official Web Site
- See How to configure scalafix rules
- If custom
.scalafix.conf
config file isn't found, .scalafix.conf will be used
- If custom
- See How to disable scalafix rules in files
- See Index of problems detected by scalafix
Configuration in MegaLinter
- Enable scalafix by adding
SCALA_SCALAFIX
in ENABLE_LINTERS variable - Disable scalafix by adding
SCALA_SCALAFIX
in DISABLE_LINTERS variable
Variable | Description | Default value |
---|---|---|
SCALA_SCALAFIX_ARGUMENTS | User custom arguments to add in linter CLI call Ex: -s --foo "bar" |
|
SCALA_SCALAFIX_COMMAND_REMOVE_ARGUMENTS | User custom arguments to remove from command line before calling the linter Ex: -s --foo "bar" |
|
SCALA_SCALAFIX_FILTER_REGEX_INCLUDE | Custom regex including filter Ex: (src\|lib) |
Include every file |
SCALA_SCALAFIX_FILTER_REGEX_EXCLUDE | Custom regex excluding filter Ex: (test\|examples) |
Exclude no file |
SCALA_SCALAFIX_CLI_LINT_MODE | Override default CLI lint mode - file : Calls the linter for each file- project : Call the linter from the root of the project |
file |
SCALA_SCALAFIX_FILE_EXTENSIONS | Allowed file extensions. "*" matches any extension, "" matches empty extension. Empty list excludes all filesEx: [".py", ""] |
[".scala"] |
SCALA_SCALAFIX_FILE_NAMES_REGEX | File name regex filters. Regular expression list for filtering files by their base names using regex full match. Empty list includes all files Ex: ["Dockerfile(-.+)?", "Jenkinsfile"] |
Include every file |
SCALA_SCALAFIX_PRE_COMMANDS | List of bash commands to run before the linter | None |
SCALA_SCALAFIX_POST_COMMANDS | List of bash commands to run after the linter | None |
SCALA_SCALAFIX_UNSECURED_ENV_VARIABLES | List of env variables explicitly not filtered before calling SCALA_SCALAFIX and its pre/post commands | None |
SCALA_SCALAFIX_CONFIG_FILE | scalafix configuration file nameUse LINTER_DEFAULT to let the linter find it |
.scalafix.conf |
SCALA_SCALAFIX_RULES_PATH | Path where to find linter configuration file | Workspace folder, then MegaLinter default rules |
SCALA_SCALAFIX_DISABLE_ERRORS | Run linter but consider errors as warnings | false |
SCALA_SCALAFIX_DISABLE_ERRORS_IF_LESS_THAN | Maximum number of errors allowed | 0 |
SCALA_SCALAFIX_CLI_EXECUTABLE | Override CLI executable | ['scalafix'] |
MegaLinter Flavours
This linter is available in the following flavours
Flavor | Description | Embedded linters | Info | |
---|---|---|---|---|
![]() |
all | Default MegaLinter Flavor | 118 |
Behind the scenes
How are identified applicable files
- File extensions:
.scala
How the linting is performed
- scalafix is called one time by identified file (
file
CLI lint mode)
Example calls
scalafix --check myfile.scala
scalafix --check --config .scalafix.conf myfile.scala
scalafix --config .scalafix.conf myfile.scala
Help content
Scalafix 0.11.1
Usage: scalafix [options] [<path> ...]
Scalafix is a refactoring and linting tool. Scalafix supports both syntactic and
semantic linter and rewrite rules. Syntactic rules can run on source code
without compilation. Semantic rules can run on source code that has been
compiled with the SemanticDB compiler plugin.
Common options:
--rules | -r [String ...] (default: [])
Scalafix rules to run, for example ExplicitResultTypes. The syntax for rules is
documented in
https://scalacenter.github.io/scalafix/docs/users/configuration#rules
--files | -f [<path> ...] (default: [])
Files or directories (recursively visited) to fix.
--config <path> (default: null)
File path to a .scalafix.conf configuration file. Defaults to .scalafix.conf in
the current working directory, if any.
--check
Check that all files have been fixed with scalafix, exiting with non-zero code
on violations. Won't write to files.
--stdout
Print fixed output to stdout instead of writing in-place.
--diff
If set, only apply scalafix to added and edited files in git diff against the
master branch.
--diff-base String (default: null)
If set, only apply scalafix to added and edited files in git diff against a
provided branch, commit or tag.
--syntactic
Run only syntactic rules, ignore semantic rules even if they are explicitly
configured in .scalafix.conf or via --rules
--triggered
Overlay the default rules & rule settings in .scalafix.conf with the `triggered`
section
--verbose
Print out additional diagnostics while running scalafix.
--help | -h
Print out this help message and exit
--version | -v
Print out version number and exit
Semantic options:
--classpath Classpath (default: "<classpath>")
Full classpath of the files to fix, required for semantic rules. The source
files that should be fixed must be compiled with semanticdb-scalac.
Dependencies are required by rules like ExplicitResultTypes, but the
dependencies do not need to be compiled with semanticdb-scalac.
--sourceroot <path> (default: null)
Absolute path passed to semanticdb with -P:semanticdb:sourceroot:<path>.
Relative filenames persisted in the Semantic DB are absolutized by the
sourceroot. Defaults to current working directory if not provided.
--semanticdb-targetroots [<path> ...] (default: [])
Absolute paths passed to semanticdb with -P:semanticdb:targetroot:<path>. Used
to locate semanticdb files. By default, Scalafix will try to locate
semanticdb files in the classpath
--auto-classpath
If set, automatically infer the --classpath flag by scanning for directories
with META-INF/semanticdb
--auto-classpath-roots [<path> ...] (default: [])
Additional directories to scan for --auto-classpath
--scalac-options [String ...] (default: [])
The scala compiler options used to compile this --classpath, for example
-Ywarn-unused-import
--scala-version ScalaVersion (default: "2.13.12")
The major or binary Scala version that the provided files are targeting, or the
full version that was used to compile them when a classpath is provided.
Tab completions:
--bash
Print out bash tab completions. To install:
```
# macOS, requires "brew install bash-completion"
scalafix --bash > /usr/local/etc/bash_completion.d/scalafix
# Linux
scalafix --bash > /etc/bash_completion.d/scalafix
```
--zsh
Print out zsh tab completions. To install:
```
scalafix --zsh > /usr/local/share/zsh/site-functions/_scalafix
unfunction _scalafix
autoload -U _scalafix
```
Less common options:
--exclude [<glob> ...] (default: [])
Unix-style glob for files to exclude from fixing. The glob syntax is defined by
`nio.FileSystem.getPathMatcher`.
--tool-classpath URLClassLoader (default: "<classloader>")
Additional classpath for compiling and classloading custom rules, as a set of
filesystem paths, separated by ':' on Unix or ';' on Windows.
--charset Charset (default: "UTF-8")
The encoding to use for reading/writing files
--no-sys-exit
If set, throw exception in the end instead of System.exit
--no-stale-semanticdb
Don't error on stale semanticdb files.
--settings ScalafixConfig (default: {})
Custom settings to override .scalafix.conf
--out-from String (default: null)
Write fixed output to custom location instead of in-place. Regex is passed as
first argument to file.replaceAll(--out-from, --out-to), requires --out-to.
--out-to String (default: null)
Companion of --out-from, string that is passed as second argument to
fileToFix.replaceAll(--out-from, --out-to)
--auto-suppress-linter-errors
Insert /* scalafix:ok */ suppressions instead of reporting linter errors.
--cwd <path> (default: "/")
The current working directory
Installation on mega-linter Docker image
- Dockerfile commands :
# Parent descriptor install
RUN curl --retry-all-errors --retry 10 -fLo coursier https://git.io/coursier-cli && \
chmod +x coursier
# Linter install
RUN ./coursier install scalafix --quiet --install-dir /usr/bin && rm -rf /root/.cache