#!/usr/bin/env sh
# -*- mode: scheme; -*-
exec guile --no-auto-compile -e main -s "$0" "$@"
!#
;;; ccwl --- Concise Common Workflow Language
;;; Copyright © 2021–2024 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of ccwl.
;;;
;;; ccwl 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.
;;;
;;; ccwl 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 ccwl.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; This script is the command-line interface to ccwl.

;;; Code:

(use-modules (rnrs conditions)
             (rnrs exceptions)
             (srfi srfi-28)
             (srfi srfi-37)
             (ice-9 match)
             (ice-9 exceptions)
             (ccwl ccwl)
             (ccwl conditions)
             (ccwl cwl)
             (ccwl graphviz)
             (ccwl ui))

(define (invalid-option opt name arg result)
  (error "Invalid option" name))

(define (invalid-operand arg result)
  (error "Invalid argument" arg))

(define %help-option
  (option (list "help") #f #t
          (lambda (opt name arg result)
            (acons 'help #t result))))

(define (main args)
  (with-exception-handler
      (lambda (condition)
        ;; Catch uncaught exceptions, print their backtrace and
        ;; request the user report an issue. Pass quit exceptions
        ;; through since those may be raised by exceptions that have
        ;; been handled.
        (cond
         ((formatted-message? condition)
          (report-formatted-message condition))
         ((not (quit-exception? condition))
          (display-backtrace (make-stack #t) (current-error-port))
          (newline (current-error-port))
          (write condition (current-error-port))
          (newline (current-error-port))
          (display "
You have discovered a bug! ccwl crashed! :-(
Please report this to https://github.com/arunisaac/ccwl/issues
Thank you!
"
                   (current-error-port))))
        (exit #f))
    (lambda ()
      (match args
        ((program "compile" args ...)
         (let* ((args (args-fold args
                                 (list (option (list #\t "to") #t #f
                                               (lambda (opt name arg result)
                                                 (let ((supported (list "cwl" "dot")))
                                                   (unless (member arg supported)
                                                     (scm-error 'misc-error
                                                                #f
                                                                "Invalid target ~A argument ~S. Supported targets are ~A."
                                                                (list (if (char? name)
                                                                          (string #\- name)
                                                                          (string-append "--" name))
                                                                      arg
                                                                      (string-join supported ", "))
                                                                #f)))
                                                 (acons 'to arg result)))
                                       %help-option)
                                 invalid-option
                                 (lambda (arg result)
                                   (acons 'source-file arg result))
                                 '((to . "cwl")))))
           (when (or (assq 'help args)
                     (not (assq-ref args 'source-file)))
             (display (format "Usage: ~a compile [OPTIONS] SOURCE-FILE
Compile SOURCE-FILE.

  -t, --to=TARGET    compile SOURCE-FILE to TARGET language;
                     Supported targets are cwl (default) and dot.

"
                              program)
                      (current-error-port))
             (exit (assq 'help args)))
           ;; We don't need to compile ccwl files. Loading is sufficient
           ;; for our purposes. Besides, compiling would fail since the
           ;; workflow macro cannot access command definitions.
           (set! %load-should-auto-compile #f)
           (let ((to (assq-ref args 'to)))
             ((cond
               ((string=? to "cwl") function->cwl)
               ((string=? to "dot") function->dot))
              (guard (exception
                      ;; Handle syntax violation exceptions by reporting
                      ;; them and exiting.
                      ((ccwl-violation? exception)
                       (report-ccwl-violation exception)
                       (exit #f)))
                (let ((result (load (canonicalize-path (assq-ref args 'source-file))
                                      read-syntax)))
                  (if (or (command? result)
                          (workflow? result))
                      result
                      (raise-exception
                       (condition (formatted-message "Last expression in file ~a returns neither workflow nor command"
                                                     (assq-ref args 'source-file)))))))
              (current-output-port)))))
        ((program args ...)
         (let ((args (args-fold args
                                (list %help-option)
                                (lambda (opt name arg result)
                                  result)
                                (lambda (arg result)
                                  result)
                                '())))
           (display (format "Usage: ~a COMMAND [OPTIONS] [ARGS]

COMMAND must be one of the sub-commands listed below:

  compile   compile a workflow

To get usage information for one of these sub-commands, run
  ~a COMMAND --help

"
                            program program)
                    (current-error-port))
           (exit (assq 'help args))))))))