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(declare (module scramble))
(import scheme (chicken base)
(chicken file)
(chicken format)
(chicken pathname)
(chicken process)
(chicken process-context)
(chicken string)
(srfi 1))
;; dependencies should be like
;; (((output jimmy.util) (source jimmy.util))
;; ((output jimmy.read) (source jimmy.read) (source jimmy.util))
;; ((output jimmy.emit) (source jimmy.emit) (source jimmy.util)))
(define egg (make-parameter #f))
(define build-dir (make-parameter "build"))
(define csc-options '("-setup-mode"
"-host"
"-D compiling-extension"
"-emit-all-import-libraries"
"-dynamic"
"-regenerate-import-libraries"
"-I $(PWD)"
"-C -I$(PWD)"))
(define source-extensions
;; The possible extensions source files can take.
(make-parameter '("scm" "sld" "ss")))
(define (read-egg #!optional egg-file)
;; Read EGG-FILE and return the structure inside.
(unless egg-file
(set! egg-file
(receive (_ _ dirs) (decompose-directory (current-directory))
(make-pathname (current-directory) (car (reverse dirs)) "egg"))))
(assert (file-exists? egg-file) "Can't find egg file" egg-file)
(assert (file-readable? egg-file) "Can't read egg file" egg-file)
(cons* `(egg-directory ,(pathname-directory egg-file))
`(egg-name ,(string->symbol (pathname-file egg-file)))
(with-input-from-file egg-file read)))
(define (egg-directory) (alist-ref 'egg-directory (egg)))
(define (egg-name) (car (alist-ref 'egg-name (egg))))
(define (egg-components) (alist-ref 'components (egg)))
(define (egg-csc-options)
(let ((opts (alist-walk (egg) 'component-options 'csc-options)))
(if opts (map ->string opts) '())))
(define (source-of c)
;; Find the source file of C and return it. If not found, error.
(cond
((alist-ref 'source (cddr (find-component c)))
=> (lambda (s)
(receive (dirs file ext) (decompose-pathname (->string (car s)))
(make-pathname (append (egg-directory)
(if (list? dirs) dirs (list dirs)))
file ext))))
(else
(let loop ((ext (source-extensions)))
(if (null? ext) #f
(let ((cand (make-pathname (egg-directory) c ext)))
(if (file-exists? cand) cand
(loop (cdr ext)))))))))
(define (output-of c)
;; Return the output file of C. It's okay if it doesn't exist.
(make-pathname (append (egg-directory) (list (build-dir)))
(->string c)
(case (car (find-component c))
((extension) "so")
((program)))))
(define (find-component name)
(find (lambda (c) (eq? name (cadr c)))
(alist-ref 'components (egg))))
(define (dependency-graph)
;; Build a dependency graph from the egg.
(define (component->deps c)
(let* ((c-name (cadr c))
(c-info (cddr c))
(c-deps (or (alist-ref 'component-dependencies c-info) '()))
(s-deps (or (alist-ref 'source-dependencies c-info) '())))
(if (null? (append c-deps s-deps))
`(,c-name ,c-name)
`(,c-name . ,(cons c-name
(append c-deps
(map ->string s-deps)))))))
(filter-map component->deps (egg-components)))
(define (alist-walk lis . keys)
(if (null? keys)
lis
(let ((kv (assoc (car keys) lis)))
(cond
((not kv) #f)
((atom? (cdr kv))
(and (null? (cdr keys)) ; this shouldn't error...
(cdr kv)))
((list? (cdr kv))
(apply alist-walk (cdr kv) (cdr keys)))))))
(define (string-join ss)
(string-intersperse ss " "))
(define (find-executable name)
(let loop ((path (string-split (get-environment-variable "PATH") ":")))
(cond
;; If no executable is found, return just the name. Another option would
;; be to error out if there isn't an executable here ...
((null? path) name)
((and (directory-exists? (car path))
(member name (directory (car path) 'with-dotfiles)))
(make-pathname (car path) name))
(else (loop (cdr path))))))
(define (rule c)
(let ((deps (alist-ref c (dependency-graph))))
(sprintf "~a: ~a $(BUILD)\n\t~a\n\t-mv ~a.import.scm $(BUILD)/"
(output-of c)
(string-join (cons (source-of (car deps))
(map output-of (cdr deps))))
"$(CSC) $(CSC_OPTIONS) $(CSC_OPTIONS_EXTRA) $< -o $@"
c)))
(define (emit-makefile egg-file)
(parameterize ((egg (read-egg egg-file)))
(print "# Automatically generated by scramble") (newline)
(print "NAME = " (egg-name))
(print "CSC = " (find-executable "csc"))
(print "CSC_OPTIONS = " (string-join csc-options))
(print "CSC_OPTIONS_EXTRA = " (string-join (egg-csc-options)))
(print "CSI = " (find-executable "csi"))
(print "BUILD = $(PWD)/" (build-dir))
(print "TESTS = $(PWD)/tests")
(print "TEST_ENV = env BUILD=$(BUILD) TESTS=$(TESTS)")
(newline)
(print ".PHONY: all test clean install uninstall")
(print "all: " (string-join (map (o source-of car) (dependency-graph))))
(print "test: build"
"\n\t" "cd $(BUILD) && "
"$(TEST_ENV) $(CSI) -setup-mode -s $(TESTS)/run.scm $(NAME)")
(print "clean:\n\t-rm -rf $(BUILD)")
(print "install:\n\tchicken-install -s")
(print "uninstall:\n\tchicken-uninstall -s")
(newline) (print "# " (egg-name)) (newline)
(print "$(BUILD):\n\t-mkdir $(BUILD)")
(for-each (o print rule cadr) (egg-components))
))
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