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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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1 changed files with 12 additions and 9 deletions
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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 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 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" ($ KEY) -> "VAL"
@ -29,11 +29,9 @@ 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. 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 If a string-to-string transformer procedure is provided, apply it to each
space-separated token in the result. space-separated token in the result.
($$ key)
Returns a procedure that looks up `key` in the `%makevars` hash table.
(?= key val) (?= key val)
Assign `val` to `key` in the `%makevars` hash table. If `val` is a procedure, Assign `val` to `key` in the `%makevars` hash table. If `val` is a procedure,
assign its output to `key` the first time that `key` is referenced. assign its output to `key` the first time that `key` is referenced.
(:= key val) (:= key val)
Assign `val` to `key` in the `%makevars` hash table. If `val` is a procedure, Assign `val` to `key` in the `%makevars` hash table. If `val` is a procedure,
evaluate it and assign its output to `key` immediately. evaluate it and assign its output to `key` immediately.
@ -59,14 +57,16 @@ have filenames or phony names.
Recipe as a procedure Recipe as a procedure
(: "clean-foo" '() (: "clean-foo" '()
(delete-file "foo.o") (lambda ()
(delete-file "foo.o")))
Recipe as a procedure that returns #f to indicate failure Recipe as a procedure that returns #f to indicate failure
(: "recent" '() (: "recent" '()
(if condition (lambda ()
#t (if condition
#f)) #t
#f))))
Recipe as a procedure returning a string to be evaluated by the system Recipe as a procedure returning a string to be evaluated by the system
@ -108,7 +108,10 @@ Note that the prerequisites is *not* a list.
$@ the target $@ the target
$* the target w/o a filename suffix $* the target w/o a filename suffix
$^ the prerequisites, as a single space-separated string
$< the first prerequisite $< the first prerequisite
$^ the prerequisites, as a single space-separated string
$$^ the prerequisites, as a scheme list of strings
$? the prerequisites that are files newer than the target file $? the prerequisites that are files newer than the target file
as a single space-separated string as a single space-separated string
$$? the prerequisites that are files newer than the target file
as a scheme list of strings