#!/bin/sh
# aside from this initial boilerplate, this is actually -*- scheme -*- code

prefix="@prefix@"
datarootdir="@datarootdir@"

GUILE_LOAD_COMPILED_PATH="@guilemoduledir@:$GUILE_LOAD_COMPILED_PATH"
export GUILE_LOAD_COMPILED_PATH

main='(module-ref (resolve-interface '\''(guix-package)) '\'guix-package')'
exec ${GUILE-@GUILE@} -L "@guilemoduledir@" -l "$0"    \
         -c "(apply $main (cdr (command-line)))" "$@"
!#
;;; Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of Guix.
;;;
;;; 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.
;;;
;;; 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 Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (guix-package)
  #:use-module (guix ui)
  #:use-module (guix store)
  #:use-module (guix derivations)
  #:use-module (guix packages)
  #:use-module (guix utils)
  #:use-module (ice-9 ftw)
  #:use-module (ice-9 format)
  #:use-module (ice-9 match)
  #:use-module (ice-9 regex)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-11)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-37)
  #:autoload   (distro) (find-packages-by-name)
  #:use-module (distro packages guile)
  #:export (guix-package))

(define %store
  (open-connection))


;;;
;;; User environment.
;;;

(define %user-environment-directory
  (and=> (getenv "HOME")
         (cut string-append <> "/.guix-profile")))

(define %profile-directory
  (string-append "/nix/var/nix/profiles/"
                 "guix/"
                 (or (and=> (getenv "USER")
                            (cut string-append "per-user/" <>))
                     "default")))

(define %current-profile
  (string-append %profile-directory "/profile"))

(define (profile-manifest profile)
  "Return the PROFILE's manifest."
  (let ((manifest (string-append profile "/manifest")))
    (if (file-exists? manifest)
        (call-with-input-file manifest read)
        '(manifest (version 0) (packages ())))))

(define (manifest-packages manifest)
  "Return the packages listed in MANIFEST."
  (match manifest
    (('manifest ('version 0) ('packages packages))
     packages)
    (_
     (error "unsupported manifest format" manifest))))

(define (latest-profile-number profile)
  "Return the identifying number of the latest generation of PROFILE.
PROFILE is the name of the symlink to the current generation."
  (define %profile-rx
    (make-regexp (string-append "^" (regexp-quote (basename profile))
                                "-([0-9]+)")))

  (define* (scandir name #:optional (select? (const #t))
                    (entry<? (@ (ice-9 i18n) string-locale<?)))
    ;; XXX: Bug-fix version introduced in Guile v2.0.6-62-g139ce19.
    (define (enter? dir stat result)
      (and stat (string=? dir name)))

    (define (visit basename result)
      (if (select? basename)
          (cons basename result)
          result))

    (define (leaf name stat result)
      (and result
           (visit (basename name) result)))

    (define (down name stat result)
      (visit "." '()))

    (define (up name stat result)
      (visit ".." result))

    (define (skip name stat result)
      ;; All the sub-directories are skipped.
      (visit (basename name) result))

    (define (error name* stat errno result)
      (if (string=? name name*)             ; top-level NAME is unreadable
          result
          (visit (basename name*) result)))

    (and=> (file-system-fold enter? leaf down up skip error #f name lstat)
           (lambda (files)
             (sort files entry<?))))

  (match (scandir (dirname profile)
                  (cut regexp-exec %profile-rx <>))
    (#f                                         ; no profile directory
     0)
    (()                                         ; no profiles
     0)
    ((profiles ...)                             ; former profiles around
     (let ((numbers (map (compose string->number
                                  (cut match:substring <> 1)
                                  (cut regexp-exec %profile-rx <>))
                         profiles)))
       (fold (lambda (number highest)
               (if (> number highest)
                   number
                   highest))
             0
             numbers)))))

(define (profile-derivation store packages)
  "Return a derivation that builds a profile (a user environment) with
all of PACKAGES, a list of name/version/output/path tuples."
  (define builder
    `(begin
       (use-modules (ice-9 pretty-print)
                    (guix build union))

       (setvbuf (current-output-port) _IOLBF)
       (setvbuf (current-error-port) _IOLBF)

       (let ((output (assoc-ref %outputs "out"))
             (inputs (map cdr %build-inputs)))
         (format #t "building user environment `~a' with ~a packages...~%"
                 output (length inputs))
         (union-build output inputs)
         (call-with-output-file (string-append output "/manifest")
           (lambda (p)
             (pretty-print '(manifest (version 0)
                                      (packages ,packages))
                           p))))))

  (build-expression->derivation store "user-environment"
                                (%current-system)
                                builder
                                (map (match-lambda
                                      ((name version output path)
                                       `(,name ,path)))
                                     packages)
                                #:modules '((guix build union))))


;;;
;;; Command-line options.
;;;

(define %default-options
  ;; Alist of default option values.
  `((profile . ,%current-profile)))

(define (show-help)
  (display (_ "Usage: guix-package [OPTION]... PACKAGES...
Install, remove, or upgrade PACKAGES in a single transaction.\n"))
  (display (_ "
  -i, --install=PACKAGE  install PACKAGE"))
  (display (_ "
  -r, --remove=PACKAGE   remove PACKAGE"))
  (display (_ "
  -u, --upgrade=REGEXP   upgrade all the installed packages matching REGEXP"))
  (newline)
  (display (_ "
  -p, --profile=PROFILE  use PROFILE instead of the user's default profile"))
  (display (_ "
  -n, --dry-run          show what would be done without actually doing it"))
  (display (_ "
  -b, --bootstrap        use the bootstrap Guile to build the profile"))
  (newline)
  (display (_ "
  -h, --help             display this help and exit"))
  (display (_ "
  -V, --version          display version information and exit"))
  (newline)
  (format #t (_ "
Report bugs to: ~a.~%") "@PACKAGE_BUGREPORT@"))

(define %options
  ;; Specification of the command-line options.
  (list (option '(#\h "help") #f #f
                (lambda args
                  (show-help)
                  (exit 0)))
        (option '(#\V "version") #f #f
                (lambda args
                  (show-version-and-exit "guix-package")))

        (option '(#\i "install") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'install arg result)))
        (option '(#\r "remove") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'remove arg result)))
        (option '(#\p "profile") #t #f
                (lambda (opt name arg result)
                  (alist-cons 'profile arg
                              (alist-delete 'profile result))))
        (option '(#\n "dry-run") #f #f
                (lambda (opt name arg result)
                  (alist-cons 'dry-run? #t result)))
        (option '(#\b "bootstrap") #f #f
                (lambda (opt name arg result)
                  (alist-cons 'bootstrap? #t result)))))


;;;
;;; Entry point.
;;;

(define (guix-package . args)
  (define (parse-options)
    ;; Return the alist of option values.
    (args-fold args %options
               (lambda (opt name arg result)
                 (leave (_ "~A: unrecognized option~%") name))
               (lambda (arg result)
                 (alist-cons 'argument arg result))
               %default-options))

  (define (show-what-to-build drv dry-run?)
    ;; Show what will/would be built in realizing the derivations listed
    ;; in DRV.
    (let* ((req  (append-map (lambda (drv-path)
                               (let ((d (call-with-input-file drv-path
                                          read-derivation)))
                                 (derivation-prerequisites-to-build %store d)))
                             drv))
           (req* (delete-duplicates
                  (append (remove (compose (cut valid-path? %store <>)
                                           derivation-path->output-path)
                                  drv)
                          (map derivation-input-path req)))))
      (if dry-run?
          (format (current-error-port)
                  (N_ "~:[the following derivation would be built:~%~{   ~a~%~}~;~]"
                      "~:[the following derivations would be built:~%~{    ~a~%~}~;~]"
                      (length req*))
                  (null? req*) req*)
          (format (current-error-port)
                  (N_ "~:[the following derivation will be built:~%~{   ~a~%~}~;~]"
                      "~:[the following derivations will be built:~%~{    ~a~%~}~;~]"
                      (length req*))
                  (null? req*) req*))))

  (define (find-package name)
    ;; Find the package NAME; NAME may contain a version number and a
    ;; sub-derivation name.
    (define request name)

    (let*-values (((name sub-drv)
                   (match (string-rindex name #\:)
                     (#f    (values name "out"))
                     (colon (values (substring name 0 colon)
                                    (substring name (+ 1 colon))))))
                  ((name version)
                   (package-name->name+version name)))
      (match (find-packages-by-name name version)
        ((p)
         (list name version sub-drv p))
        ((p _ ...)
         (format (current-error-port)
                 (_ "warning: ambiguous package specification `~a'~%")
                 request)
         (format (current-error-port)
                 (_ "warning: choosing ~s~%")
                 p)
         (list name version sub-drv p))
        (()
         (leave (_ "~a: package not found~%") request)))))

  (setlocale LC_ALL "")
  (textdomain "guix")
  (setvbuf (current-output-port) _IOLBF)
  (setvbuf (current-error-port) _IOLBF)

  (let ((opts (parse-options)))
    (with-error-handling
      (parameterize ((%guile-for-build
                      (package-derivation %store
                                          (if (assoc-ref opts 'bootstrap?)
                                              (@@ (distro packages base)
                                                  %bootstrap-guile)
                                              guile-2.0))))
        (let* ((dry-run? (assoc-ref opts 'dry-run?))
               (profile  (assoc-ref opts 'profile))
               (install  (filter-map (match-lambda
                                      (('install . (? store-path?))
                                       #f)
                                      (('install . package)
                                       (find-package package))
                                      (_ #f))
                                     opts))
               (drv      (filter-map (match-lambda
                                      ((name version sub-drv
                                             (? package? package))
                                       (package-derivation %store package))
                                      (_ #f))
                                     install))
               (install* (append
                          (filter-map (match-lambda
                                       (('install . (? store-path? path))
                                        `(,(store-path-package-name path)
                                          #f #f ,path))
                                       (_ #f))
                                      opts)
                          (map (lambda (tuple drv)
                                 (match tuple
                                   ((name version sub-drv _)
                                    (let ((output-path
                                           (derivation-path->output-path
                                            drv sub-drv)))
                                      `(,name ,version ,sub-drv ,output-path)))))
                               install drv)))
               (remove   (filter-map (match-lambda
                                      (('remove . package)
                                       package)
                                      (_ #f))
                                     opts))
               (packages (append install*
                                 (fold alist-delete
                                       (manifest-packages
                                        (profile-manifest profile))
                                       remove))))

          (show-what-to-build drv dry-run?)

          (or dry-run?
              (and (build-derivations %store drv)
                   (let* ((prof-drv (profile-derivation %store packages))
                          (prof     (derivation-path->output-path prof-drv))
                          (number   (latest-profile-number profile))
                          (name     (format #f "~a/~a-~a-link"
                                            (dirname profile)
                                            (basename profile) (+ 1 number))))
                     (and (build-derivations %store (list prof-drv))
                          (begin
                            (symlink prof name)
                            (when (file-exists? profile)
                              (delete-file profile))
                            (symlink name profile)))))))))))

;; Local Variables:
;; eval: (put 'guard 'scheme-indent-function 1)
;; End: