#!/bin/sh
":"; exec emacs --no-site-file --script "$0" -- "$@" # -*-emacs-lisp-*-

;; Uses a couple simple heuristics to locate issues with your environment that
;; could interfere with running or setting up DOOM Emacs.

(defconst IS-MAC (eq system-type 'darwin))

(require 'package)
(load "~/.emacs.d/core/autoload/message" nil t)

(unless (equal (expand-file-name user-emacs-directory)
               (expand-file-name "~/.emacs.d/"))
  (error "Couldn't find ~/.emacs.d"))

;;
(defvar doom-errors 0)
(defmacro check! (cond &rest body)
  (declare (indent defun))
  `(when ,cond
     ,@body
     (setq doom-errors (1+ doom-errors))))

(defun indented (spc msg)
  (declare (indent defun))
  (with-temp-buffer
    (insert msg)
    (indent-rigidly (point-min) (point-max) spc)
    (buffer-string)))

(defun autofill (&rest msgs)
  (declare (indent defun))
  (let ((fill-column 70))
    (with-temp-buffer
      (dolist (line msgs)
        (when line
          (insert line)))
      (fill-region (point-min) (point-max))
      (buffer-string))))

(defun columns (cols length strings)
  (declare (indent defun))
  (with-temp-buffer
    (let ((sub-format (format "%%-%ds " (1- length)))
          col-format)
      (dotimes (i (1- cols))
        (setq col-format (concat col-format sub-format)))
      (setq col-format (concat col-format "%s"))
      (while strings
        (insert (apply #'format col-format
                       (let (args)
                         (dotimes (i cols (nreverse args))
                           (push (if strings (pop strings) "") args))))
                "\n")))
    (buffer-string)))

(defmacro error!   (&rest args) `(message! (bold (red ,@args))))
(defmacro warn!    (&rest args) `(message! (bold (yellow ,@args))))
(defmacro success! (&rest args) `(message! (bold (green ,@args))))
(defmacro explain! (&rest args) `(message! (indented 2 (autofill ,@args))))

;;
(message! "%s\nRunning Emacs %s on %s\n----\n"
          (bold "DOOM Doctor")
          (bold emacs-version)
          (bold "%s" system-type))


;; --- is emacs set up properly? ------------------------------

(check! (version< emacs-version "25.1")
  (error! "Important: Emacs %s detected [%s]" emacs-version (executable-find "emacs"))
  (explain!
   "DOOM only supports >= 25.1. Perhaps your PATH wasn't set up properly."
   (when IS-MAC
     (concat "\nMacOS users should use homebrew (https://brew.sh) to install Emacs\n"
             "  brew install emacs --with-modules --with-imagemagick --with-cocoa"))))


;; --- is the environment set up properly? --------------------

(check! (not (executable-find "git"))
  (error! "Important: Couldn't find git"))

(check! (memq system-type '(windows-nt ms-dos cygwin))
  (warn! "Warning: Windows detected")
  (explain! "DOOM was designed for MacOS and Linux. Expect a bumpy ride!"))

(if (executable-find "tar")
    (check! (not (string-match-p "(GNU tar)" (shell-command-to-string "tar --version")))
      (warn! "Warning: BSD tar detected")
      (explain!
       "QUELPA (through package-build) uses the system tar to build plugins."
       "BSD tar *could* cause errors during package installation or updating from"
       "non-ELPA sources."
       (when IS-MAC
         (concat "\nMacOS users can install gnu-tar via homebrew:\n"
                 "  brew install gnu-tar"))))
  (check! nil (error! "Important: Couldn't find tar"))) ; very unlikely

(check! (not (executable-find "gnutls-cli"))
  (cond ((executable-find "openssl")
         (warn! "Warning: couldn't find gnutls-cli")
         (explain! "...but found openssl (which is possibly less secure)"))
        (t
         (error! "Warning: neither gnutls-cli or openssl were found")
         (explain! "You will be unable to install/update packages through secure sources (HTTPS)"))))


;; --- report! ------------------------------------------------

(when (getenv "DEBUG")
  (message! "\n====\nHave some debug information:\n")

  (let (doom-core-packages doom-debug-mode)
    (condition-case ex
        (progn
          (let ((inhibit-message t))
            (load "~/.emacs.d/core/core.el" nil t))
          (doom-initialize-packages)
          (success! "  + Attempt to load DOOM: success! Loaded v%s" doom-version)
          (when (executable-find "git")
            (message! "    Revision %s"
               (or (ignore-errors
                     (let ((default-directory user-emacs-directory))
                       (shell-command-to-string "git rev-parse HEAD")))
                   "\n"))))
      ('error (warn! "  + Attempt to load DOOM: failed\n    %s\n" (or (cdr-safe ex) (car ex))))))

  (message! "  + Emacs directory: %s\n" user-emacs-directory)

  (when (bound-and-true-p doom-modules)
    (message! "  + enabled modules:\n%s"
       (indented 4
         (columns 3 23
           (mapcar (lambda (x) (format "+%s" x))
                   (mapcar #'cdr (doom--module-pairs)))))))

  (when (bound-and-true-p doom-packages)
    (message! "  + enabled packages:\n%s"
       (indented 4
         (columns 2 35
           (mapcar (lambda (pkg)
                     (let ((desc (cadr (assq pkg package-alist))))
                       (when desc
                         (package-desc-full-name desc))))
                   (sort (mapcar #'car doom-packages) #'string-lessp))))))

  (message! "  + byte-compiled files:\n%s"
     (indented 4
       (columns 2 39
         (let ((files (append (directory-files-recursively doom-core-dir ".elc$")
                              (directory-files-recursively doom-modules-dir ".elc$"))))
           (or (and files (mapcar (lambda (file) (file-relative-name file doom-emacs-dir))
                                  (nreverse files)))
               (list "n/a"))))))

  (message! "  + exec-path:\n%s"
     (indented 4
       (columns 1 79 exec-path)))

  (message! "  + PATH:\n%s"
     (indented 4
       (columns 1 79 (split-string (getenv "PATH") ":")))))

;;
(if (= doom-errors 0)
    (success! "Everything seems fine, happy Emacs'ing!")
  (message "\n----")
  (warn! "There were issues!")
  (unless (getenv "DEBUG")
    (message! "\nHopefully these can help you find problems. If not, run this doctor again with DEBUG=1:")
    (message! "\n  DEBUG=1 make doctor\n")
    (message! "And file a bug report with its output at https://github.com/hlissner/.emacs.d/issues")))