pman/CHEATSHEET.md

CHEATSHEET FOR STUDIOUS POTATO MAKE

Boilerplate

Add this at the top of your build script.

#!/usr/bin/env sh
exec guile -s "$0" "$@"
!#

(use-modules (studious-potato))
(initialize)

Add this at the bottom of your build script

(build)

The rules go in between initialize and build

MAKEVARS

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) -> "VAL"

($ key [transformer])
    Look up `key` in the `%makevars` hash table and return the result.
    If transformer 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.
(:= key val)
    Assign `val` to `key` in the `%makevars` hash table. If `val` is a procedure,
    evaluate it and assign its output to `key` immediately.

RULES

The target rule is for when the target, and the prerequisites, if any, have filenames or phony names.

(: target-name '(prereq-name-1 prereq-name-2 ...)
   recipe-1
   recipe-2
   ...)
   
 `target-name` is a string which is either a filename to be created
 or an phony name like "all" or "clean".
 
 recipe as a string
 
 (: "foo.o" '("foo.c")
   "cc -c foo.o")
 
 recipe as a procedure
 
 (: "clean-foo" '()
   (delete-file "foo.o")
   
 recipe as a procedure that returns #f to indicate failure
 
 (: "recent" '()
   (if condition
     #t
     #f))
   
 recipe as procedure returning string
 
 (: "foo.o" '("foo.c")
   (lambda ()
     (format #f "cc ~A -c foo.c" some-flags))
     
 recipe using recipe helper procedures
 
 (: "foo.c" '("foo.c")
   (~ ($ CC) ($ CFLAGS) "-c" $<))

The suffix rule is a generic rule to convert one file type to another. Note that the prerequisites is not a list.

 (-> ".c" ".o"
   (~ ($ CC) ($ CFLAGS) ".c" $<))

RECIPE HELPER

 Concatenate elements with `~`. `~` inserts spaces between the elements.
 Elements can be
 - strings, characters, or numbers
 - procedures that return strings
 - `makevar` hash-table references
 - special variables
 
 (~ "string" (lambda () "string") ($ KEY) $@ )
 
 Three versions of `~` with special effects
 (~- ...)   ignores any errors
 (~@ ...)   doesn't print recipe to console
 (~+ ...)   runs even when `--no-execute` was chosen
 
 Recipes can contain the following special variables
 
 $@    the target
 $*    the target w/o a filename suffix
 $^    the prerequisites, as a single string
 $<    the first prerequisite
 $?    the prerequisites that are files newer than the target file