Kod language definition

# @title Diff
# @matchuti public.diff-text
# @matchext diff, patch
# @matchfirstline (?x)^(=== modified file|====\s*//.+\s-\s.+\s+ ====|Index: |--- [^%]|\*\*\*.*\d{4}\s*$|\d+(,\d+)*(a|d|c)\d+(,\d+)*$|diff --git )

# language definition for files created with 'diff'

# diff created with -u option
state oldfile = '(?=^[-]{3})' begin
  oldfile start '^[-]{3}'
  oldfile start '^[-]'
  newfile start '^[+]'
  difflines start '^@@'
end

# diff created with -c option
state oldfile = '(?=^[*]{3})' begin
  environment oldfile = '^[*]{3}[[:blank:]]+[[:digit:]]' begin
    normal start '^[[:space:]]'
    newfile = '(?=^[-]{3})' exit
  end
  oldfile start '^[*]{3}'

  environment newfile = '^[-]{3}[[:blank:]]+[[:digit:]]' begin
    normal start '^[[:space:]]'
    newfile = '(?=^[*]{3})' exit
    normal start '^diff' exit
  end
  newfile start '^[-]{3}'
end

# otherwise, created without options
state difflines = '(?=^[[:digit:]])' begin
  difflines start '^[[:digit:]]'
  oldfile start '^[<]'
  newfile start '^[>]'
end

Textmate language definition

{	scopeName = 'source.diff';
	firstLineMatch = '(?x)^
		(===\ modified\ file
		|==== \s* // .+ \s - \s .+ \s+ ====
		|Index:\ 
		|---\ [^%]
		|\*\*\*.*\d{4}\s*$
		|\d+(,\d+)* (a|d|c) \d+(,\d+)* $
		|diff\ --git\ 
		)
	';
	fileTypes = ( 'diff', 'patch' );
	foldingStartMarker = '^\+\+\+';
	foldingStopMarker = '^---|^$';
	patterns = (
		{	name = 'meta.separator.diff';
			match = '^((\*{15})|(={67})|(-{3}))$\n?';
			captures = { 1 = { name = 'punctuation.definition.separator.diff'; }; };
		},
		{	name = 'meta.diff.range.normal';
			match = '^\d+(,\d+)*(a|d|c)\d+(,\d+)*$\n?';
		},
		{	name = 'meta.diff.range.unified';
			match = '^(@@)\s*(.+?)\s*(@@)($\n?)?';
			captures = {
				1 = { name = 'punctuation.definition.range.diff'; };
				2 = { name = 'meta.toc-list.line-number.diff'; };
				3 = { name = 'punctuation.definition.range.diff'; };
			};
		},
		{	name = 'meta.diff.range.context';
			match = '^(((\-{3}) .+ (\-{4}))|((\*{3}) .+ (\*{4})))$\n?';
			captures = {
				3 = { name = 'punctuation.definition.range.diff'; };
				4 = { name = 'punctuation.definition.range.diff'; };
				6 = { name = 'punctuation.definition.range.diff'; };
				7 = { name = 'punctuation.definition.range.diff'; };
			};
		},
		{	name = 'meta.diff.header.from-file';
			match = '(^(((-{3}) .+)|((\*{3}) .+))$\n?|^(={4}) .+(?= - ))';
			captures = {
				4 = { name = 'punctuation.definition.from-file.diff'; };
				6 = { name = 'punctuation.definition.from-file.diff'; };
				7 = { name = 'punctuation.definition.from-file.diff'; };
			};
		},
		{	name = 'meta.diff.header.to-file';
			match = '(^(\+{3}) .+$\n?| (-) .* (={4})$\n?)';
			captures = {
				2 = { name = 'punctuation.definition.to-file.diff'; };
				3 = { name = 'punctuation.definition.to-file.diff'; };
				4 = { name = 'punctuation.definition.to-file.diff'; };
			};
		},
		{	name = 'markup.inserted.diff';
			match = '^(((>)( .*)?)|((\+).*))$\n?';
			captures = {
				3 = { name = 'punctuation.definition.inserted.diff'; };
				6 = { name = 'punctuation.definition.inserted.diff'; };
			};
		},
		{	name = 'markup.changed.diff';
			match = '^(!).*$\n?';
			captures = { 1 = { name = 'punctuation.definition.inserted.diff'; }; };
		},
		{	name = 'markup.deleted.diff';
			match = '^(((<)( .*)?)|((-).*))$\n?';
			captures = {
				3 = { name = 'punctuation.definition.inserted.diff'; };
				6 = { name = 'punctuation.definition.inserted.diff'; };
			};
		},
		{	name = 'meta.diff.index';
			match = '^Index(:) (.+)$\n?';
			captures = {
				1 = { name = 'punctuation.separator.key-value.diff'; };
				2 = { name = 'meta.toc-list.file-name.diff'; };
			};
		},
	);
}