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Command Usage

The yamlfmt command supports 3 primary modes of operation and a number of command line configuration options.

Basic Usage

The most basic usage of the yamlfmt command is to use the default configuration and provide a single path to format.

yamlfmt x.yaml

You can also provide a directory path, which yamlfmt will search recursively through for any file with a yml or yaml extension.

yamlfmt .

You can make use of the alternative Doublestar path mode for more dynamic patterns.

yamlfmt -dstar "**/*.yaml"

(Technically, providing the same pattern in bash without quotes in standard path mode will do standard bash glob expansion and work similarly.)

See Specifying Paths for more details about the path collection behaviour.

Three Modes of Operation

The command supports three modes of operation: Format, Lint, and Dry Run.

Format

This is the default operation (no flag specified). It will collect all paths that match the include patterns and run them straight through formatting, rewriting each file with the results.

Format stdin

This mode will read input from stdin and output formatted result to stdout. By using the paths -, /dev/stdin, or using the -in flag, yamlfmt will only read from stdin and write the result to stdout.

cat x.yaml | yamlfmt -
cat x.yaml | yamlfmt /dev/stdin
cat x.yaml | yamlfmt -in

(Despite /dev/stdin and - being Linux/Bash standards, this convention was manually implemented in a cross-platform way. It will function identically on Windows. Would you want to use the Linux standards like this on Windows? I don't know, but it will work 😄)

Dry Run

This mode is enabled through the -dry flag. This will collect all paths that match the include patterns and run them through formatting, printing each file that had a formatting diff to stdout. This mode is affected by the -quiet flag, where only the paths of the files with diffs will be printed.

Lint

This mode is enabled through the -lint flag. This will collect all paths that match the include patterns and run them through formatting, and will exit with code 1 (fail) if any files have formatting differences, outputting the diffs to stdout. This mode is also affected by the -quiet flag, where only the paths of the files with diffs will be printed.

Flags

All flags must be specified before any path arguments.

Operation Flags

These flags adjust the command's mode of operation. All of these flags are booleans.

Name Flag Example Description
Help -help yamlfmt -help Print the command usage information.
Print Version -version yamlfmt -version Print the yamlfmt version.
Print Config -print_conf yamlfmt -print_conf Print the merged configuration to use.
Dry Run -dry yamlfmt -dry . Use Dry Run mode
Lint -lint yamlfmt -lint . Use Lint mode
Quiet Mode -quiet yamlfmt -dry -quiet . Use quiet mode. Only has effect in Dry Run or Lint modes.
Read Stdin -in cat x.yaml | yamlfmt -in Read input from stdin and output result to stdout.

Configuration Flags

These flags will configure the underlying behaviour of the command.

The string array flags can be a bit confusing. See the String Array Flags section for more information.

Name Flag Type Example Description
Config File Path -conf string yamlfmt -conf ./config/.yamlfmt Specify a path to read a configuration file from.
Global Config -global_conf bool yamlfmt -global_conf Force yamlfmt to use the configuration file from the system config directory.
Disable Global Config -no_global_conf bool yamlfmt -no_global_conf Disable looking for the configuration file from the system config directory.
Doublestar -dstar bool yamlfmt -dstar "**/*.yaml" Enable Doublestar path collection mode. Note that doublestar patterns should be specified with quotes in bash to prevent shell expansion.
Exclude -exclude []string yamlfmt -exclude ./not/,these_paths.yaml Patterns to exclude from path collection. These are in addition to the exclude patterns specified in the config file
Gitignore Excludes -gitignore_excludes bool yamlfmt -gitignore_excludes Use a gitignore file to exclude paths. This is in addition to otherwise specified exclude patterns.
Gitignore Path -gitignore_path string yamlfmt -gitignore_path .special_gitignore Specify a path to a gitignore file to use. Defaults to .gitignore (in working directory).
Extensions -extensions []string yamlfmt -extensions yaml,yml Extensions to use in standard path collection. Has no effect in Doublestar mode. These add to extensions specified in the config file
Formatter Config -formatter []string yamlfmt -formatter indent=2,include_document_start=true Provide configuration values for the formatter. See Formatter Configuration Options for options. Each field is specified as configkey=value.
Debug Logging -debug []string yamlfmt -debug paths,config Enable debug logging. See Debug Logging for more information.
Output Format -output_format default, line yamlfmt -output_format line Choose a different output format. Defaults to default. See Output docs for more information.

String Array Flags

String array flags can be provided in two ways. For example with a flag called -arrFlag:

  • Individual flags
    • -arrFlag a -arrFlag b -arrFlag c
    • Result: arrFlag: [a b c]
  • Comma separated value in single flag
    • -arrFlag a,b,c
    • Result: arrFlag: [a b c]
  • Technically they can be combined but why would you?
    • -arrFlag a,b -arrFlag c
    • Result: arrFlag: [a b c]

Debug Logging

Debug logging can be enabled through the -debug array flag. The following is the list of supported debug codes:

  • paths
    • Log the details for the path discovery process. Use it to debug your include/exclude patterns.
  • config
    • Log the details for the configuration loading process. Use it to figure out which config file yamlfmt uses and why.
  • all
    • Enable all available debug codes.