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Update CHEATSHEET.md

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Mike Gran 2021-02-10 09:57:25 -08:00 committed by GitHub
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CHEATSHEET.md
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@ -21,7 +21,7 @@ The rules go in between `initialize` and `build`
A hash table called `%makevars` has string keys. These procedures
are syntax that add quotation marks around `key`, so you call them without the quotes on
`key`. The returned value is a string.
`key`. The returned value of `$` is a string, or an empty string on failure.
($ KEY) -> "VAL"
@ -29,8 +29,6 @@ are syntax that add quotation marks around `key`, so you call them without the q
Look up `key` in the `%makevars` hash table and return the result.
If a string-to-string transformer procedure is provided, apply it to each
space-separated token in the result.
($$ key)
Returns a procedure that looks up `key` in the `%makevars` hash table.
(?= key val)
Assign `val` to `key` in the `%makevars` hash table. If `val` is a procedure,
assign its output to `key` the first time that `key` is referenced.
@ -59,14 +57,16 @@ have filenames or phony names.
Recipe as a procedure
(: "clean-foo" '()
(delete-file "foo.o")
(lambda ()
(delete-file "foo.o")))
Recipe as a procedure that returns #f to indicate failure
(: "recent" '()
(lambda ()
(if condition
#t
#f))
#f))))
Recipe as a procedure returning a string to be evaluated by the system
@ -108,7 +108,10 @@ Note that the prerequisites is *not* a list.
$@ the target
$* the target w/o a filename suffix
$^ the prerequisites, as a single space-separated string
$< the first prerequisite
$^ the prerequisites, as a single space-separated string
$$^ the prerequisites, as a scheme list of strings
$? the prerequisites that are files newer than the target file
as a single space-separated string
$$? the prerequisites that are files newer than the target file
as a scheme list of strings