How to add support for a new tool to super-linter

If you want to propose a Pull Request to add new language support or a new tool, do the following.

Update documentation

README.md

Provide test cases

Create the test/linters/<LANGUAGE_NAME> directory.
Provide at least one test case with a file that is supposed to pass validation, with the right file extension if needed: test/linters/<LANGUAGE_NAME>/<name-of-tool>-good
Provide at least one test case with a file that is supposed to fail validation, with the right file extension if needed: test/linters/<LANGUAGE_NAME>/<name-of-tool>-bad. If the tool supports fix mode, the test case supposed to fail validation should only contain violations that the fix mode can automatically fix. Avoid test cases that fail only because of syntax errors, when possible.
Update expected summary reports: test/data/super-linter-summary.
If the tool supports check-only mode or fix mode, add the <LANGUGAGE> to the LANGUAGES_WITH_FIX_MODE array in test/testUtils.sh

Update the test suite

Update the test suite to check for installed packages, the commands that your new tool needs in the PATH, and the expected version command:

test/inspec/super-linter/controls/super_linter.rb

Install the tool

Install the tool by pointing to specific package or container image versions:
- If there are PyPi packages, create a text file named dependencies/python/<name-of-tool>.txt and list the packages there.
- If there are npm packages, update dependencies/package.json and dependencies/package-lock.json. by adding the new packages.
- If there are Ruby Gems, update dependencies/Gemfile and dependencies/Gemfile.lock
- If there are Maven or Java packages:
  1. Create a directory named dependencies/<name-of-tool>.
  2. Create a dependencies/<name-of-tool>/build.gradle file with the following contents:
```
repositories {
  mavenLocal()
  mavenCentral()
}

// Hold this dependency here so we can get automated updates using DependaBot
dependencies {
  implementation 'your:dependency-here:version'
}

group 'com.github.super-linter'
version '1.0.0-SNAPSHOT'
```
  3. Update the dependencies section in dependencies/<name-of-tool>/build.gradle to install your dependencies.
  4. Add the following content to the Dockerfile:
```
COPY scripts/install-<name-of-tool>.sh /
RUN --mount=type=secret,id=GITHUB_TOKEN /<name-of-tool>.sh && rm -rf /<name-of-tool>.sh
```
  5. Create scripts/install-<name-of-tool>.sh, and implement the logic to install your tool. You get the version of a dependency from build.gradle. Example:
```
GOOGLE_JAVA_FORMAT_VERSION="$(
  set -euo pipefail
  awk -F "[:']" '/google-java-format/ {print $4}' "google-java-format/build.gradle"
)"
```
  6. Add the new to DependaBot configuration:
```
- package-ecosystem: "gradle"
  directory: "/dependencies/<name-of-tool>"
  schedule:
    interval: "weekly"
  open-pull-requests-limit: 10
```
- If there is a container (Docker) image:
  1. Add a new build stage to get the image:
```
FROM your/image:version as <name-of-tool>
```
  2. Copy the necessary binaries and libraries to the relevant locations. Example:
```
COPY --from=<name-of-tool> /usr/local/bin/<name-of-command> /usr/bin/
```

Run the new tool

Update the orchestration scripts to run the new tool:
- lib/globals/languages.sh: add a new item to LANGUAGES_ARRAY array. Use the "name" of the language, then a _, and finally the name of the tool. To allow for future additions, use a language name and a tool name for the new item. Example: PYTHON_RUFF. In the context of this document, to avoid repetitions we reference this new item as <LANGUAGE_NAME>.
- Define the command to invoke the new tool:
  - lib/functions/linterCommands.sh: add the command to invoke the tool. Define a new variable: LINTER_COMMANDS_ARRAY_<LANGUAGE_NAME>. Example: LINTER_COMMANDS_ARRAY_GO_MODULES=(golangci-lint run --allow-parallel-runners)
    - If there are arguments that you can only pass using the command line, and you think users might want to customize them, define a new variable using <LANGUAGE_NAME>_COMMAND_ARGS and add it to the command if the configuration provides it. Example:
```
<LANGUAGE_NAME>_COMMAND_ARGS="${<LANGUAGE_NAME>_COMMAND_ARGS:-""}"
if [ -n "${<LANGUAGE_NAME>_COMMAND_ARGS:-}" ]; then
  export <LANGUAGE_NAME>_COMMAND_ARGS
  AddOptionsToCommand "LINTER_COMMANDS_ARRAY_<LANGUAGE_NAME>" "${<LANGUAGE_NAME>_COMMAND_ARGS}"
fi
```
  - lib/globals/linterCommandsOptions.sh: add "check only mode" and "fix linting and formatting issues mode" options if the tool supports it. Super-linter will automatically add them to the command to run the tool.
    - If the tool runs in "fix linting and formatting issues mode" by default, define a new variable with the options to add to the tool command to enable "check only mode": <LANGUAGE_NAME>_CHECK_ONLY_MODE_OPTIONS=(....). Example: PYTHON_BLACK_CHECK_ONLY_MODE_OPTIONS=(--diff --check)
    - If the tool runs in "check only mode" by default, define a new variable with the options to add to the tool command to enable "fix linting and formatting issues mode": <LANGUAGE_NAME>_FIX_MODE_OPTIONS=(...). Example: ANSIBLE_FIX_MODE_OPTIONS=(--fix)
    - If the tool needs option for both the "check only mode" and the fix mode, define both variables as described in the previous points.

Configure the new tool

If the new tool doesn't support a configuration file search mechanism, update the command to run the new tool to set the path to the configuration file:

Define a new variable in lib/globals/linterRules.sh: <LANGUAGE_NAME>_FILE_NAME="${<LANGUAGE_NAME>_CONFIG_FILE:-"default-config-file-name.conf"}" where default-config-file-name.conf is the name of the new configuration file for the new tool. Use one of the default recommended configurationfile names for the new tool. Example: PYTHON_RUFF_FILE_NAME="${PYTHON_RUFF_CONFIG_FILE:-.ruff.toml}". Super-linter automatically initializes the path to the configuration file in the <LANGUAGE_NAME>_LINTER_RULES variable using the <LANGUAGE_NAME>_FILE_NAME. Example: PYTHON_RUFF_LINTER_RULES
Create a new minimal configuration file in the TEMPLATES directory. Example: TEMPLATES/default-config-file-name.conf.
Update lib/functions/linterCommands.sh to set the path to the configuration file path. Example: htmlhint --config "${HTML_LINTER_RULES}"

Configure the new tool for the Super-linter repository

If the default configuration of the new tool is unsuitable for the Super-linter repository, create a new configuration file for the new tool using the default filename:

If the new tool supports a configuration file search mechanism, create the configuration file in a location where the new tool will find it.
If the new tool doesn't support a configuration file search mechanism and you updated the new tool command to set the configuration file path, create the configuration file in the .github/linters directory using its default filename.

Populate the file list

Provide the logic to populate the list of files or directories to examine: lib/functions/buildFileList.sh

Get the tool version

Provide the logic to populate the versions file: scripts/linterVersions.sh

Detection logic

If necessary, provide elaborate logic to detect if the tool should examine a file or a directory: lib/functions/detectFiles.sh

Special cases

If the tool needs to take into account special cases, reach out to the maintainers by creating a draft pull request and ask relevant questions there. For example, you might need to provide new logic or customize the existing one to:

Validate the runtime environment: lib/functions/validation.sh.
Get the installed version of the tool: scripts/linterVersions.sh
Load configuration files: lib/functions/linterRules.sh
Run the tool: lib/functions/worker.sh
Compose the tool command: lib/functions/linterCommands.sh
Modify the core Super-linter logic: lib/linter.sh

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