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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Alex Vong <alexvong1995@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build clojure-utils)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 ftw)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 regex)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-8)
+  #:use-module (srfi srfi-26)
+  #:export (@*
+            @@*
+            define-with-docs
+
+            %doc-regex
+            install-doc
+
+            %source-dirs
+            %test-dirs
+            %compile-dir
+            package-name->jar-names
+            %main-class
+            %omit-source?
+            %aot-include
+            %aot-exclude
+            %tests?
+            %test-include
+            %test-exclude
+
+            %clojure-regex
+            canonicalize-relative-path
+            find-files*
+            file-sans-extension
+            relative-path->clojure-lib-string
+            find-clojure-libs
+            compiled-from?
+            include-list\exclude-list
+            eval-with-clojure
+            create-jar))
+
+(define-syntax-rule (@* module name)
+  "Like (@ MODULE NAME), but resolves at run time."
+  (module-ref (resolve-interface 'module) 'name))
+
+(define-syntax-rule (@@* module name)
+  "Like (@@ MODULE NAME), but resolves at run time."
+  (module-ref (resolve-module 'module) 'name))
+
+(define-syntax-rule (define-with-docs name docs val)
+  "Create top-level variable named NAME with doc string DOCS and value VAL."
+  (begin (define name val)
+         (set-object-property! name 'documentation docs)))
+
+(define-with-docs %doc-regex
+  "Default regex for matching the base name of top-level documentation files."
+  (format #f
+          "(~a)|(\\.(html|markdown|md|txt)$)"
+          (@@ (guix build guile-build-system)
+              %documentation-file-regexp)))
+
+(define* (install-doc #:key
+                      doc-dirs
+                      (doc-regex %doc-regex)
+                      outputs
+                      #:allow-other-keys)
+  "Install the following to the default documentation directory:
+
+1. Top-level files with base name matching DOC-REGEX.
+2. All files (recursively) inside DOC-DIRS.
+
+DOC-REGEX can be compiled or uncompiled."
+  (let* ((out (assoc-ref outputs "out"))
+         (doc (assoc-ref outputs "doc"))
+         (name-ver (strip-store-file-name out))
+         (dest-dir (string-append (or doc out) "/share/doc/" name-ver "/"))
+         (doc-regex* (if (string? doc-regex)
+                         (make-regexp doc-regex)
+                         doc-regex)))
+    (for-each (cut install-file <> dest-dir)
+              (remove (compose file-exists?
+                               (cut string-append dest-dir <>))
+                      (scandir "./" (cut regexp-exec doc-regex* <>))))
+    (for-each (cut copy-recursively <> dest-dir)
+              doc-dirs)
+    #t))
+
+(define-with-docs %source-dirs
+  "A default list of source directories."
+  '("src/"))
+
+(define-with-docs %test-dirs
+  "A default list of test directories."
+  '("test/"))
+
+(define-with-docs %compile-dir
+  "Default directory for holding class files."
+  "classes/")
+
+(define (package-name->jar-names name)
+  "Given NAME, a package name like \"foo-0.9.1b\",
+return the list of default jar names: (\"foo-0.9.1b.jar\" \"foo.jar\")."
+  (map (cut string-append <> ".jar")
+       (list name
+             (receive (base-name _)
+                 (package-name->name+version name)
+               base-name))))
+
+(define-with-docs %main-class
+  "Default name for main class.  It should be a symbol or #f."
+  #f)
+
+(define-with-docs %omit-source?
+  "Include source in jars by default."
+  #f)
+
+(define-with-docs %aot-include
+  "A default list of symbols deciding what to compile.  Note that the exclude
+list has priority over the include list.  The special keyword #:all represents
+all libraries found under the source directories."
+  '(#:all))
+
+(define-with-docs %aot-exclude
+  "A default list of symbols deciding what not to compile.
+See the doc string of '%aot-include' for more details."
+  '())
+
+(define-with-docs %tests?
+  "Enable tests by default."
+  #t)
+
+(define-with-docs %test-include
+  "A default list of symbols deciding what tests to include.  Note that the
+exclude list has priority over the include list.  The special keyword #:all
+represents all tests found under the test directories."
+  '(#:all))
+
+(define-with-docs %test-exclude
+  "A default list of symbols deciding what tests to exclude.
+See the doc string of '%test-include' for more details."
+  '())
+
+(define-with-docs %clojure-regex
+  "Default regex for matching the base name of clojure source files."
+  "\\.cljc?$")
+
+(define-with-docs canonicalize-relative-path
+  "Like 'canonicalize-path', but for relative paths.
+Canonicalizations requiring the path to exist are omitted."
+  (let ((remove.. (lambda (ls)
+                    (fold-right (match-lambda*
+                                  (((and comp (not "..")) (".." comps ...))
+                                   comps)
+                                  ((comp (comps ...))
+                                   (cons comp comps)))
+                                '()
+                                ls))))
+    (compose (match-lambda
+               (() ".")
+               (ls (string-join ls "/")))
+             remove..
+             (cut remove (cut member <> '("" ".")) <>)
+             (cut string-split <> #\/))))
+
+(define (find-files* base-dir . args)
+  "Similar to 'find-files', but with BASE-DIR stripped and result
+canonicalized."
+  (map canonicalize-relative-path
+       (with-directory-excursion base-dir
+         (apply find-files "./" args))))
+
+;;; FIXME: should be moved to (guix build utils)
+(define-with-docs file-sans-extension
+  "Strip extension from path, if any."
+  (@@ (guix build guile-build-system)
+      file-sans-extension))
+
+(define (relative-path->clojure-lib-string path)
+  "Convert PATH to a clojure library string."
+  (string-map (match-lambda
+                (#\/ #\.)
+                (#\_ #\-)
+                (chr chr))
+              (file-sans-extension path)))
+
+(define* (find-clojure-libs base-dir
+                            #:key (clojure-regex %clojure-regex))
+  "Return the list of clojure libraries found under BASE-DIR.
+
+CLOJURE-REGEX can be compiled or uncompiled."
+  (map (compose string->symbol
+                relative-path->clojure-lib-string)
+       (find-files* base-dir clojure-regex)))
+
+(define (compiled-from? class lib)
+  "Given class file CLASS and clojure library symbol LIB, decide if CLASS
+results from compiling LIB."
+  (string-prefix? (symbol->string lib)
+                  (relative-path->clojure-lib-string class)))
+
+(define* (include-list\exclude-list include-list exclude-list
+                                    #:key all-list)
+  "Given INCLUDE-LIST and EXCLUDE-LIST, replace all occurences of #:all by
+slicing ALL-LIST into them and compute their list difference."
+  (define (replace-#:all ls all-ls)
+    (append-map (match-lambda
+                  (#:all all-ls)
+                  (x (list x)))
+                ls))
+  (let ((include-list* (replace-#:all include-list all-list))
+        (exclude-list* (replace-#:all exclude-list all-list)))
+    (lset-difference equal? include-list* exclude-list*)))
+
+(define (eval-with-clojure expr extra-paths)
+  "Evaluate EXPR with clojure.
+
+EXPR must be a s-expression writable by guile and readable by clojure.
+For examples, '(require '[clojure.string]) will not work,
+because the guile writer converts brackets to parentheses.
+
+EXTRA-PATHS is a list of paths which will be appended to $CLASSPATH."
+  (let* ((classpath (getenv "CLASSPATH"))
+         (classpath* (string-join (cons classpath extra-paths) ":")))
+    (invoke "java"
+            "-classpath" classpath*
+            "clojure.main"
+            "--eval" (object->string expr))))
+
+(define* (create-jar output-jar dir-files-alist
+                     #:key
+                     (verbose? #t)
+                     (compress? #f)
+                     (main-class %main-class))
+  "Given DIR-FILES-ALIST, an alist of the form: ((DIR . FILES) ...)
+Create jar named OUTPUT-JAR from FILES with DIR stripped."
+  (let ((grouped-options (string-append "c"
+                                        (if verbose? "v" "")
+                                        "f"
+                                        (if compress? "" "0")
+                                        (if main-class "e" ""))))
+    (apply invoke `("jar"
+                    ,grouped-options
+                    ,output-jar
+                    ,@(if main-class (list (symbol->string main-class)) '())
+                    ,@(append-map (match-lambda
+                                    ((dir . files)
+                                     (append-map (lambda (file)
+                                                   `("-C" ,dir ,file))
+                                                 files)))
+                                  dir-files-alist)))))