;; Setup package repositories and install use-package if needed

(setq gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3")
(setq package-check-signature nil)

(require 'package)
(let* ((no-ssl (and (memq system-type '(windows-nt ms-dos))
		    (not (gnutls-available-p))))
       (proto (if no-ssl "http" "https")))
  (when no-ssl
    (warn "\
Your version of Emacs does not support SSL connections,
which is unsafe because it allows man-in-the-middle attacks.
There are two things you can do about this warning:
1. Install an Emacs version that does support SSL and be safe.
2. Remove this warning from your init file so you won't see it again."))
  (add-to-list 'package-archives (cons "melpa" (concat proto "://melpa.org/packages/")) t)
  (when (< emacs-major-version 24)
    ;; For important compatibility libraries like cl-lib
    (add-to-list 'package-archives (cons "gnu" (concat proto "://elpa.gnu.org/packages/"))))
  (add-to-list 'custom-theme-load-path "~/.emacs.d/themes/" t)
  (add-to-list 'load-path "~/.emacs.d/lisp/" t))

(package-initialize)

(unless (package-installed-p 'use-package)
  (package-refresh-contents)
  (package-install 'use-package)
  (package-install 'use-package-chords))
(require 'use-package)
(setq use-package-always-ensure t)

;; Configure packages with use-package

(use-package asm-mode
  :config
  (setq asm-comment-char ?\#)
  :mode (("\\.s\\'" . asm-mode)
	 ("\\.S\\'" . asm-mode)
	 ("\\.asm\\'" . asm-mode)))

(use-package async)

(use-package cc-mode
  :init
  (defun c-lineup-arglist-tabs-only (ignored)
    "Line up argument lists by tabs, not spaces"
    (let* ((anchor (c-langelem-pos c-syntactic-element))
	   (column (c-langelem-2nd-pos c-syntactic-element))
	   (offset (- (1+ column) anchor))
	   (steps (floor offset c-basic-offset)))
      (* (max steps 1)
	 c-basic-offset)))

  (c-add-style "linux-tabs-only"
	       '("linux" (c-offsets-alist
			  (arglist-cont-nonempty
			   c-lineup-gcc-asm-reg
			   c-lineup-arglist-tabs-only))))

  (defun set-c-styles ()
    (setq indent-tabs-mode t)
    (setq show-trailing-whitespace t)
    (c-set-style "linux-tabs-only"))

  :hook (c-mode . set-c-styles))

(use-package cargo
  :after rust-mode
  :hook rust-mode)

(use-package counsel
  :bind (("M-x" . counsel-M-x)
	 ("C-x C-f" . counsel-find-file))
  :hook (find-file . (lambda () (linum-mode 1))))

(use-package dracula-theme
  :config (load-theme 'dracula t))

(use-package dockerfile-mode
  :mode ("Dockerfile\\'" . dockerfile-mode))

(use-package editorconfig
  :config
  (editorconfig-mode 1))

(use-package eshell
  :hook (eshell-mode . (lambda () (linum-mode -1))))

(use-package evil
  :after (:all undo-tree term)
  :init
  (setq evil-want-fine-undo t
	evil-want-keybinding nil)
  :config
  (evil-mode 1)
  (evil-set-undo-system 'undo-tree)
  (evil-set-initial-state 'term-mode 'emacs)
  (evil-set-initial-state 'dired-mode 'emacs))

(use-package evil-collection
  :after (:all evil magit)
  :init
  (setq evil-magit-state 'normal))

(use-package fill-column-indicator
  :config
  (setq fci-rule-column 90))

(use-package git-commit)

(use-package go-mode
  :mode ("\\.go\\'" . go-mode))

(use-package goto-chg)

(use-package haskell-mode
  :mode ("\\.hs\\'" . haskell-mode)
  :interpreter ("haskell" . haskell-mode))

(use-package ivy
  :init
  (setq ivy-use-virtual-buffers t
	ivy-count-format ""
	ivy-display-style nil)
  :config
  (ivy-mode 1))

(use-package less-css-mode
  :mode ("\\.less\\'" . less-css-mode))

(use-package linum
  :init
  (defvar linum-current-line 1 "Current line number.")
  (defvar linum-format-fmt   "" " ")
  (defvar linum-format "" " ")
  (defface linum-current-line
    `((t :inherit linum
	 :foreground "chocolate"
	 :weight bold
	 ))
    "Face for displaying the current line number."
    :group 'linum)
  :config
  (defadvice linum-update (before advice-linum-update activate)
    "Set the current line."
    (setq linum-current-line (line-number-at-pos)))

  (defun custom-linum-numbering ()
    (setq-local linum-format-fmt
		(let ((width
		       (length (number-to-string (count-lines (point-min) (point-max))))))
		  (concat " %" (number-to-string width) "d "))))

  (defun linum-format-func (line)
    (let ((face
	   (if (= line linum-current-line)
	       'linum-current-line 'linum)))
      (propertize (format linum-format-fmt line) 'face face)))

  (setq linum-format 'linum-format-func)
  (linum-mode t)
  :hook (linum-before-numbering . custom-linum-numbering))

(use-package magit)

(use-package magit-popup)

(use-package multi-term
  :after term
  :config
  (setq multi-term-buffer-name "term"
	multi-term-program "/bin/bash"
	term-bind-key-alist
	(list (cons "C-c C-c" 'term-interrupt-subjob)
	      (cons "C-c C-j" 'term-line-mode)
	      (cons "C-c C-k" 'term-char-mode)
	      (cons "M-DEL" 'term-send-backward-kill-word)
	      (cons "M-d" 'term-send-forward-kill-word)
	      (cons "<C-left>" 'term-send-backward-word)
	      (cons "<C-right>" 'term-send-forward-word)
	      (cons "C-r" 'term-send-reverse-search-history)
	      (cons "C-y" 'term-send-raw)))
  :bind (([f5] . multi-term)
	 ("C-<tab>" . multi-term-next)
	 ("C-<iso-lefttab>" . multi-term-prev)))

(use-package nasm-mode
  :mode ("\\.nasm\\'" . nasm-mode))

(use-package pkg-info)

(use-package plsql
  :load-path "~/.emacs.d/lisp/plsql.el"
  :mode ("\\.plsql\\'" . plsql-mode))

(use-package python
  :mode ("\\.py\\'" . python-mode)
  :interpreter ("python" . python-mode))

(use-package rust-mode
  :config
  (setq rust-format-on-save t)
  :mode ("\\.rs\\'" . rust-mode))

(use-package s)

(use-package sh-script
  :hook (sh-mode . (lambda () (setq indent-tabs-mode nil))))

(use-package swiper
  :bind (("C-s" . swiper)))

(use-package term
  :config
  ;; https://web.archive.org/web/20181111010613/ ->
  ;; ->    http://paralambda.org/2012/07/02/using-gnu-emacs-as-a-terminal-emulator/
  (defun term-handle-ansi-terminal-messages (message)
    (while (string-match "\eAnSiT.+\n" message)
      ;; Extract the command code and the argument.
      (let* ((start (match-beginning 0))
	     (command-code (aref message (+ start 6)))
	     (argument
	      (save-match-data
		(substring message
			   (+ start 8)
			   (string-match "\r?\n" message
					 (+ start 8))))))
	;; Delete this command from MESSAGE.
	(setq message (replace-match "" t t message))

	(cond ((= command-code ?c)
	       (setq term-ansi-at-dir argument))
	      ((= command-code ?h)
	       (setq term-ansi-at-host argument))
	      ((= command-code ?u)
	       (setq term-ansi-at-user argument))
	      ((= command-code ?e)
	       (save-excursion
		 (find-file-other-window argument)))
	      ((= command-code ?x)
	       (save-excursion
		 (find-file argument))))))

    (when (and term-ansi-at-host term-ansi-at-dir term-ansi-at-user)
      (setq buffer-file-name
	    (format "%s@%s:%s" term-ansi-at-user term-ansi-at-host term-ansi-at-dir))
      (set-buffer-modified-p nil)
      (setq default-directory
	    (if (string= term-ansi-at-host (system-name))
		(concatenate 'string term-ansi-at-dir "/")
	      (format "/%s@%s:%s/" term-ansi-at-user term-ansi-at-host term-ansi-at-dir))))
    message)
  (setq term-scroll-to-bottom-on-output t)
  (setq term-suppress-hard-newline t)
  :hook ((term-mode . (lambda ()
			(linum-mode -1)
			(setq-local global-hl-line-mode nil)))))

(use-package terraform-mode)

(use-package toml-mode
  :mode ("\\.toml\\'" . toml-mode))

(use-package tramp
  :config
  (setq tramp-default-method "ssh"))

(use-package undo-tree
  :config
  (setq undo-limit 40000
	undo-strong-limit 60000
	undo-tree-auto-save-history t
	undo-tree-history-directory-alist '(("." . "~/.undo-tree")))
  (global-undo-tree-mode))

(use-package web-mode
  :init
  (setq web-mode-markup-indent-offset 2
	web-mode-code-indent-offset 2
	web-mode-css-indent-offset 2)
  :mode (("\\.html\\'" . web-mode)
	 ("\\.js\\'" . web-mode)
	 ("\\.css\\'" . web-mode)
	 ("\\.tpl\\.php\\'" . web-mode)
	 ("\\.[agj]sp\\'" . web-mode)
	 ("\\.as[cp]x\\'" . web-mode)
	 ("\\.erb\\'" . web-mode)
	 ("\\.mustache\\'" . web-mode)
	 ("\\.djhtml\\'" . web-mode)
	 ("\\.html?\\'" . web-mode)))

(use-package with-editor)

(use-package yaml-mode
  :mode (("\\.yml\\'" . yaml-mode)
	 ("\\.yaml\\'" . yaml-mode)))

;; Configure emacs general settings with use-package

(use-package emacs
  :init
  (defun remove-elc ()
    "If you're saving an elisp file, likely the .elc is no longer valid."
    (if (file-exists-p (concat buffer-file-name "c"))
	(delete-file (concat buffer-file-name "c"))))
  (defun gcm-scroll-down () (interactive) (scroll-up 1))
  (defun gcm-scroll-up () (interactive) (scroll-down 1))
  :config
  (when (fboundp 'menu-bar-mode) (menu-bar-mode -1))
  (when (fboundp 'tool-bar-mode) (tool-bar-mode -1))
  (when (fboundp 'scroll-bar-mode) (scroll-bar-mode -1))
  (when (fboundp 'windmove-default-keybindings) (windmove-default-keybindings))
  (setq frame-title-format
	'(buffer-file-name "%f" (dired-directory dired-directory "%b"))
	custom-file                       "~/.emacs.d/custom.el"
	auth-source-save-behavior      nil
	enable-local-variables         nil
	inhibit-startup-screen         t
	vc-follow-symlinks             t
	inhibit-compacting-font-caches 1
	mouse-wheel-scroll-amount      '(3 ((shift) . 3))
	mouse-wheel-progressive-speed  nil
	mouse-wheel-follow-mouse       't
	scroll-conservatively          10000
	scroll-step                    1
	auto-save-interval             1000
	auto-window-vscroll            nil
	backup-by-copying              t
	backup-directory-alist         '(("." . "~/.saves"))
	delete-old-versions            t
	kept-new-versions              6
	kept-old-versions              2
	version-control                t
	backup-directory-alist         `((".*" . ,temporary-file-directory))
	auto-save-file-name-transforms `((".*" ,temporary-file-directory t))
	vc-mode                        1
	ring-bell-function             'ignore
	column-number-mode             1
	savehist-mode                  1)
  (setq-default scroll-up-aggressively   0.01
		scroll-down-aggressively 0.01
		indent-tabs-mode         t
		tab-width                8)
  (global-auto-revert-mode 1)
  (fringe-mode '(0 . 0))
  (global-hl-line-mode 1)
  (blink-cursor-mode 0)
  (setq blink-cursor-blinks 0)
  (display-time-mode 1)
  (electric-pair-mode 1)
  (show-paren-mode t)
  (define-key minibuffer-local-map [escape] 'minibuffer-keyboard-quit)
  (define-key minibuffer-local-ns-map [escape] 'minibuffer-keyboard-quit)
  (define-key minibuffer-local-completion-map [escape] 'minibuffer-keyboard-quit)
  (define-key minibuffer-local-must-match-map [escape] 'minibuffer-keyboard-quit)
  (define-key minibuffer-local-isearch-map [escape] 'minibuffer-keyboard-quit)
  :bind (("C-<down>" . gcm-scroll-down)
	 ("C-<next>" . gcm-scroll-down)
	 ("C-<up>" . gcm-scroll-up)
	 ("C-<prior>" . gcm-scroll-up))
  :hook ((before-save . delete-trailing-whitespace)
	 (after-save . remove-elc)))