Samurai Coder

Update: Thanks to Allan and Mike, this cheat sheet is now officially in YAML bundle in TextMate. Get it at the svn repository.

Here is what I do. The data is from the official reference card.

In Bundle Editor, make a new command named "Show YAML Reference Card. Set "Save" to "Nothiing", "Input" to "None", and "Output" to "Show as HTML". In "Commands(s)", type in as in below:

. "$TM_SUPPORT_PATH/lib/webpreview.sh"
html_header "YAML Reference Card" "YAML"
Markdown.pl <<'EOF'

<title>YAML Reference Card</title>

	  Collection indicators:
	      '? ' : Key indicator.
	      ': ' : Value indicator.
	      '- ' : Nested series entry indicator.
	      ', ' : Separate in-line branch entries.
	      '[]' : Surround in-line series branch.
	      '{}' : Surround in-line keyed branch.
	  Scalar indicators:
	      '''' : Surround in-line unescaped scalar ('' escaped ').
	      '"'  : Surround in-line escaped scalar (see escape codes below).
	      '|'  : Block scalar indicator.
	      '>'  : Folded scalar indicator.
	      '-'  : Strip chomp modifier ('|-' or '>-').
	      '+'  : Keep chomp modifier ('|+' or '>+').
	      1-9  : Explicit indentation modifier ('|1' or '>2').
	             # Modifiers can be combined ('|2-', '>+1').
	  Alias indicators:
	      '&'  : Anchor property.
	      '*'  : Alias indicator.
	  Tag property: # Usually unspecified.
	      none    : Unspecified tag (automatically resolved by application).
	      '!'     : Non-specific tag (by default, "!!map"/"!!seq"/"!!str").
	      '!foo'  : Primary (by convention, means a local "!foo" tag).
	      '!!foo' : Secondary (by convention, means "tag:yaml.org,2002:foo").
	      '!h!foo': Requires "%TAG !h! <prefix>" (and then means "<prefix>foo").
	      '!<foo>': Verbatim tag (always means "foo").
	  Document indicators:
	      '%'  : Directive indicator.
	      '---': Document header.
	      '...': Document terminator.
	  Misc indicators:
	      ' #' : Throwaway comment indicator.
	      '`@' : Both reserved for future use.
	  Special keys:
	      '='  : Default "value" mapping key.
	      '<<' : Merge keys from another mapping.
	  Core types: # Default automatic tags.
	      '!!map' : { Hash table, dictionary, mapping }
	      '!!seq' : { List, array, tuple, vector, sequence }
	      '!!str' : Unicode string
	  More types:
	      '!!set' : { cherries, plums, apples }
	      '!!omap': [ one: 1, two: 2 ]
	  Language Independent Scalar types:
	      { ~, null }              : Null (no value).
	      [ 1234, 0x4D2, 02333 ]   : [ Decimal int, Hexadecimal int, Octal int ]
	      [ 1_230.15, 12.3015e+02 ]: [ Fixed float, Exponential float ]
	      [ .inf, -.Inf, .NAN ]    : [ Infinity (float), Negative, Not a number ]
	      { Y, true, Yes, ON  }    : Boolean true
	      { n, FALSE, No, off }    : Boolean false
	      ? !!binary >
	          R0lG...BADS=
	      : >-
	          Base 64 binary value.
	  Escape codes:
	   Numeric   : { "\x12": 8-bit, "\u1234": 16-bit, "\U00102030": 32-bit }
	   Protective: { "\\": '\', "\"": '"', "\ ": ' ', "\<TAB>": TAB }
	   C         : { "\0": NUL, "\a": BEL, "\b": BS, "\f": FF, "\n": LF, "\r": CR,
	                 "\t": TAB, "\v": VTAB }
	   Additional: { "\e": ESC, "\_": NBSP, "\N": NEL, "\L": LS, "\P": PS }
EOF
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