#lang zuo
(require "version.zuo")

(provide install)

;; Installation steps are written in a way that can run immediately
;; or that can be rendered as commands in a makefile-shaped script

(define (install at-workarea [vars (hash)] [uninstall? #f] [script-to #f])
  (define config (config-file->hash (at-workarea "Mf-config") vars))
  (define (lookup key) (hash-ref config key #f))

  (define (out-raw s)
    (fd-write script-to s))
  (define (out s)
    (out-raw (~a "\n" s)))

  (define-syntax (define-var stx)
    `(define ,(cadr stx) (let ([v (or (lookup ',(cadr stx))
                                      ,(list-ref stx 2))])
                           (cond
                             [script-to
                              (out (~a ',(cadr stx) "=" v))
                              (~a "${" ',(cadr stx) "}")]
                             [else v]))))
  (define-syntax (define-now-var stx)
    `(define ,(cadr stx) (or (lookup ',(cadr stx))
                             ,(list-ref stx 2))))

  (define m (lookup 'm))

  ;; The following variables determine where the executables, boot files,
  ;; example programs, and manual pages are installed.

  ;; executable directory
  (define-var InstallBin "/usr/bin")

  ;; library directory
  (define-var InstallLib "/usr/lib")

  ;; man page directory
  (define-var InstallMan "/usr/man/man1")

  ;; installation owner
  (define-var InstallOwner "")

  ;; installation group
  (define-var InstallGroup "")

  ;; Files are actually installed at ${TempRoot}${InstallBin},
  ;; ${TempRoot}${InstallLib}, and ${TempRoot}${InstallMan}.
  ;; This useful for testing the install process and for building
  ;; installation scripts
  (define-var TempRoot "")

  ;; compress man pages?
  (define-var GzipManPages "yes")

  ;; executable names
  (define-var InstallSchemeName "scheme")
  (define-var InstallPetiteName "petite")
  (define-var InstallScriptName "scheme-script")

  ;; Whether to install "kernel.o" or "libkernel.a"
  (define-now-var Kernel "KernelLib") ; or "KernelO"

  ;; Empty lib vars mean install libz.a and liblz4.a
  (define-now-var zlibLib "")
  (define-now-var LZ4Lib "")

  ;; Everything after here is derived from the configuration

  (define Version (let ([l (get-version)])
                    (~a "csv" (list-ref l 0) "." (list-ref l 1) "." (list-ref l 2) "." (list-ref l 3))))

  (define (build-path* . elems)
    (if script-to
        (string-join elems "/")
        (apply build-path elems)))
  
  (define (at-workarea* . elems)
    (if script-to
        (apply build-path* elems)
        (apply at-workarea elems)))

  (define (at-source* . elems)
    (if script-to
        (apply build-path* (if (glob-match? "../*" (car elems))
                               (cons (substring (car elems) 3) (cdr elems))
                               elems))
        (apply at-source elems)))

  (define (guard* a cmp b . body)
    (cond
      [script-to
       (out (~a "\tif [ \"" a "\" " cmp " \"" b "\" ] ; then \\"))
       (for-each (lambda (t)
                   (t)
                   (out-raw ";\\"))
                 body)
       (out "\t fi")]
      [else
       (when (if (string=? cmp "=")
                 (string=? a b)
               (not (string=? a b)))
         (for-each (lambda (t) (t)) body))]))

  (define Include (at-workarea* "boot" m))
  (define PetiteBoot (at-workarea* "boot" m "petite.boot"))
  (define SchemeBoot (at-workarea* "boot" m "scheme.boot"))
  (define Revision (at-workarea* "boot" m "revision"))
  (define Scheme (at-workarea* "bin" m "scheme"))
  (define InstallLibExamples (build-path* InstallLib Version "examples"))
  (define InstallLibBin (build-path* InstallLib Version m))

  (define (prefix-path prefix path)
    (cond
      [(string=? prefix "") path]
      [script-to (~a prefix path)]
      [else
       (apply build-path (cons prefix (let loop ([path path] [accum '()])
                                        (define l (split-path path))
                                        (if (not (car l))
                                            accum
                                            (loop (car l) (cons (cdr l) accum))))))]))

  (define Bin (prefix-path TempRoot InstallBin))
  (define Lib (prefix-path TempRoot (build-path InstallLib Version)))
  (define LibExamples (prefix-path TempRoot InstallLibExamples))
  (define LibBin (prefix-path TempRoot InstallLibBin))
  (define Man (prefix-path TempRoot InstallMan))
  (define PetitePath (build-path* Bin InstallPetiteName))
  (define SchemePath (build-path* Bin InstallSchemeName))
  (define SchemeScriptPath (build-path* Bin InstallScriptName))

  (struct literal (content))

  (define (shell/wait* . args)
    (let ([args (map (lambda (arg)
                       (if (literal? arg)
                           (literal-content arg)
                           (if script-to
                               arg
                               (string->shell arg))))
                     args)])
      (if script-to
          (out (~a "\t" (apply build-shell args)))
          (shell/wait (apply build-shell args)))))

  (define (quoted* s)
    (if script-to
        (~a "\"" s "\"")
        s))
  
  (define (I . args)
    (apply shell/wait*
           (list* (at-source* "./installsh")
                  "-o" (quoted* InstallOwner) "-g" (quoted* InstallGroup)
                  args)))
  (define (rm-f f)
    (shell/wait* "rm" "-f" f))
  (define (rm-rf d)
    (shell/wait* "rm" "-rf" d))
  (define (ln-f from to)
    (shell/wait* "ln" "-f" from to))

  (when (or (not uninstall?) script-to)
    (when script-to (out "\ninstall:"))
    (for-each (lambda (d)
                (I "-d" "-m" "755" d))
              (list Lib LibBin LibExamples Bin Man))

    ;; bin
    (rm-f SchemePath)
    (rm-f PetitePath)
    (rm-f SchemeScriptPath)
    (I "-m" "555" Scheme SchemePath)
    (ln-f SchemePath PetitePath)
    (ln-f SchemePath SchemeScriptPath)

    ;; lib
    (I "-m" "444" PetiteBoot (build-path* LibBin "petite.boot"))
    (guard* InstallPetiteName "!=" "petite"
            (lambda ()
              (rm-f (build-path* LibBin (~a InstallPetiteName ".boot"))))
            (lambda ()
              (ln-f (build-path* LibBin "petite.boot") (build-path* LibBin (~a InstallPetiteName ".boot")))))
    (I "-m" "444" SchemeBoot (build-path* LibBin "scheme.boot"))
    (guard* InstallSchemeName "!=" "scheme"
            (lambda ()
              (rm-f (build-path* LibBin (~a InstallSchemeName ".boot"))))
            (lambda ()
              (ln-f (build-path* LibBin "scheme.boot") (build-path* LibBin (~a InstallSchemeName ".boot")))))
    (ln-f (build-path* LibBin "scheme.boot") (build-path* LibBin (~a InstallScriptName ".boot")))
    (I "-m" "444" (build-path* Include "main.o") LibBin)
    (I "-m" "444" (build-path* Include "scheme.h") LibBin)
    (I "-m" "444" Revision (build-path* LibBin "revision"))

    ;; man
    (shell/wait* "sed"
                 "-e" (quoted* (~a "s;{InstallBin};" InstallBin ";g"))
                 "-e" (quoted* (~a "s;{InstallLibExamples};" InstallLibExamples ";g"))
                 "-e" (quoted* (~a "s;{InstallLibBin};" InstallLibBin ";g"))
                 "-e" (quoted* (~a "s;{InstallPetiteName};" InstallPetiteName ";g"))
                 "-e" (quoted* (~a "s;{InstallSchemeName};" InstallSchemeName ";g"))
                 "-e" (quoted* (~a "s;{InstallScriptName};" InstallScriptName ";g"))
                 (at-source* "../scheme.1.in")
                 (literal ">")
                 (at-workarea* "scheme.1"))
    (for-each (lambda (manpage)
                (I "-m" "444" (at-workarea* "scheme.1") manpage)
                (guard* GzipManPages "=" "yes"
                        (lambda () (shell/wait* "gzip" "-f" manpage))))
              (list (build-path* Man (~a InstallSchemeName ".1"))
                    (build-path* Man (~a InstallPetiteName ".1"))))

    (let ([kernel (if (string=? Kernel "KernelO") "kernel.o" "libkernel.a")])
      (I "-m" "444" (build-path* Include kernel) LibBin))

    (when (string=? Kernel "KernelLib")
      (when (string=? zlibLib "")
        (I "-m" "444" (at-workarea* "zlib/libz.a") LibBin))
      (when (string=? LZ4Lib "")
        (I "-m" "444" (at-workarea* "lz4/lib/liblz4.a") LibBin)))

    (apply I (list* "-m" "444" (append
                                (map (lambda (n) (at-source* "../examples" n))
                                     (ls (at-source "../examples")))
                                (list LibExamples)))))

  (when (or uninstall? script-to)
    (when script-to (out "\nuninstall:"))
    (rm-rf Lib)
    (rm-f PetitePath)
    (rm-f SchemePath)
    (rm-f SchemeScriptPath)
    (rm-f (build-path* Man (~a InstallPetiteName ".1")))
    (rm-f (build-path* Man (~a InstallPetiteName ".1.gz")))
    (rm-f (build-path* Man (~a InstallSchemeName ".1")))
    (rm-f (build-path* Man (~a InstallSchemeName ".1.gz"))))

  (when script-to
    (out "")))
