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dlang-community / dfmt


Dfmt is a formatter for D source code


dfmt Build Status

dfmt is a formatter for D source code


dfmt is beta quality. Make backups of your files or use source control when using the --inplace option.


Using Make

  • Clone the repository
  • Run git submodule update --init --recursive in the dfmt directory
  • To compile with DMD, run make in the dfmt directory. To compile with LDC, run make ldc instead. The generated binary will be placed in dfmt/bin/.

Installing with DUB

> dub fetch --version='~master' dfmt && dub run dfmt -- -h


By default, dfmt reads its input from stdin and writes to stdout. If a file name is specified on the command line, input will be read from the file instead, and output will be written to stdout.

dfmt uses EditorConfig files for configuration. If you run dfmt on a source file it will look for .editorconfig files that apply to that source file. If no file is specified on the command line, dfmt will look for .editorconfig files that would apply to a D file in the current working directory. Command line options can be used instead of .editorconfig files, or to override options found in .editorconfig files.


  • --help | -h: Display command line options
  • --inplace | -i: A file name is required and the file will be edited in-place.
  • --align_switch_statements: See dfmt_align_switch_statements below
  • --brace_style: See brace_style below
  • --end_of_line: See end_of_line below
  • --indent_size: See indent_size below
  • --indent_style | -t: See indent_style below
  • --max_line_length: See max_line_length below
  • --soft_max_line_length: See dfmt_soft_max_line_length below
  • --outdent_attributes: See dfmt_outdent_attributes below
  • --space_after_cast: See dfmt_space_after_cast below
  • --split_operator_at_line_end: See dfmt_split_operator_at_line_end below
  • --tab_width: See tab_width below
  • --selective_import_space: See dfmt_selective_import_space below
  • --compact_labeled_statements: See dfmt_compact_labeled_statements below
  • --template_constraint_style: See dfmt_template_constraint_style below


dfmt --inplace --space_after_cast=false --max_line_length=80 \
    --soft_max_line_length=70 --brace_style=otbs file.d

Disabling formatting

Formatting can be temporarily disabled by placing the comments // dfmt off and // dfmt on around code that you do not want formatted.

void main(string[] args)
    bool optionOne, optionTwo, optionThree;

    // dfmt has no way of knowing that "getopt" is special, so it wraps the
    // argument list normally
	getopt(args, "optionOne", &optionOne, "optionTwo", &optionTwo, "optionThree", &optionThree);

	// dfmt off
        "optionOne", &optionOne,
        "optionTwo", &optionTwo,
        "optionThree", &optionThree);
    // dfmt on


dfmt uses EditorConfig configuration files. dfmt-specific properties are prefixed with dfmt_.

Standard EditorConfig properties

Property Name Allowed Values Default Value Description
end_of_line cr, crlf and lf lf See EditorConfig documentation.
insert_final_newline true Not supported. dfmt always inserts a final newline.
charset UTF-8 Not supported. dfmt only works correctly on UTF-8.
indent_style tab, space space See EditorConfig documentation.
indent_size positive integers 4 See EditorConfig documentation.
tab_width positive integers 4 See EditorConfig documentation.
trim_trailing_whitespace true Not supported. dfmt does not emit trailing whitespace.
max_line_length positive integers 120 See EditorConfig documentation.

dfmt-specific properties

Property Name Allowed Values Default Value Description
dfmt_brace_style allman, otbs, or stroustrup allman See Wikipedia
dfmt_soft_max_line_length positive integers 80 The formatting process will usually keep lines below this length, but they may be up to max_line_length columns long.
dfmt_align_switch_statements (Not yet implemented) true, false true Align labels, cases, and defaults with their enclosing switch.
dfmt_outdent_attributes (Not yet implemented) true, false true Decrease the indentation level of attributes.
dfmt_split_operator_at_line_end true, false false Place operators on the end of the previous line when splitting lines.
dfmt_space_after_cast true, false true Insert space after the closing paren of a cast expression.
dfmt_space_after_keywords (Not yet implemented) true, false true Insert space after if, while, foreach, etc, and before the (.
dfmt_selective_import_space true, false true Insert space after the module name and before the : for selective imports.
dfmt_compact_labeled_statements true, false true Place labels on the same line as the labeled switch, for, foreach, or while statement.
dfmt_template_constraint_style conditional_newline_indent conditional_newline always_newline always_newline_indent conditional_newline_indent Control the formatting of template constraints.


  • Braces - { and }
  • Brackets - [ and ]
  • Parenthesis / Parens - ( and )