(define-module (glicid utils)
 #:use-module (guix packages)
 #:use-module (guix transformations)
 #:use-module (gnu packages gcc)
 #:use-module (glicid packages gcc)
 #:use-module (gnu packages commencement)
 #:use-module (gnu packages)
 #:export (latest-version)
 #:export (gcc11-instead-of-gcc)
 #:export (gcc10-instead-of-gcc)


 )
;; helper function
;; return latest version of 2 packages

(define (latest-version v1 v2) (if (string> (package-version v1) (package-version v2)) v1 v2))

(define gcc11-instead-of-gcc
  ;; This is a procedure to replace GCC by GCC11,
  ;; recursively.
;  (package-input-rewriting/spec `((,gcc-toolchain . ,(const gcc-toolchain-11)))))
  (package-input-rewriting `(
                             (,gcc-toolchain . ,gcc-toolchain-11)
                             (,gfortran-toolchain . ,gfortran-toolchain-11)
                            )
  )
)

(define (transform-package original-package suffix)
 (package
  (inherit original-package)
  (name (string-append (package-name original-package) "-" suffix ))
 )
)


(define (instead-of package-a-spec package-b) 
 (package-input-rewriting/spec `(
                                  (,package-a-spec . ,(const package-b)
                                  ) 
                                ;  #:deep? #t
                                 )
  )
)