;;; init.el --- Initialization file for emacs
;;; Commentary: Emacs startup file --- initialization file for emacs
(require 'package)

(setq package-enable-at-startup nil)
(setq package-archives
      '(("org"   . "http://orgmode.org/elpa/")
        ("gnu"   . "http://elpa.gnu.org/packages/")
        ("melpa" . "https://melpa.org/packages/")))
(package-initialize)

;; Bootstrap `use-package`
(unless (package-installed-p 'use-package)
  (package-refresh-contents)
  (package-install 'use-package))
(require 'use-package)

;; Some term enhancement
(defadvice term-sentinel (around my-advice-term-sentinel (proc msg))
           (if (memq (process-status proc) '(signal exit))
             (let ((buffer (process-buffer proc)))
               ad-do-it
               (kill-buffer buffer))
             ad-do-it))
(ad-activate 'term-sentinel)

(defadvice ansi-term (before force-bash)
           (interactive (list "/usr/bin/fish")))
(ad-activate 'ansi-term)

;; Other configs
(setq make-backup-files nil)
(setq auto-save-default nil)

;; Splash Screen
(setq inhibit-startup-screen t)
(setq initial-scratch-message ";; Happy Hacking")

;; Show matching parens
(setq show-paren-delay 0)
(show-paren-mode 1)

;; Paragraph movement
(global-set-key (kbd "s-j") 'forward-paragraph)
(global-set-key (kbd "s-k") 'backward-paragraph)

;; Keybinding for term mode
(add-hook 'term-mode
          (lambda () (global-set-key (kbd "s-v") 'term-paste)))

;; OrgMode Configs
(setq org-html-validation-link nil)
(setq org-todo-keywords
      '((sequence "TODO" "WORKING" "HOLD" "|" "DONE")))
(setq org-todo-keyword-faces
      '(("TODO"    . "blue")
	("WORKING" . "yellow")
	("HOLD"    . "red")
	("DONE"    . "green")))

;; UI configurations
(if (display-graphic-p)
  (progn
    (tool-bar-mode -1)
    (scroll-bar-mode -1)
    )
  )
(tooltip-mode    -1)
(menu-bar-mode   -1)
(global-linum-mode 1)

(add-to-list 'default-frame-alist '(font . "Iosevka-14"))
(add-to-list 'default-frame-alist '(height . 24))
(add-to-list 'default-frame-alist '(width . 80))

;; Vim mode
(use-package evil
             :ensure t
             :config
             (evil-mode 1))

(use-package evil-escape
             :ensure t
             :init
             (setq-default evil-escape-key-sequence "jk")
             :config
             (evil-escape-mode 1))

;; Anzu for search matching
(use-package anzu
             :ensure t
             :config
             (global-anzu-mode 1)
             (global-set-key [remap query-replace-regexp]
                             'anzu-query-replace-regexp)
             (global-set-key [remap query-replace]
                             'anzu-query-replace))

;; Theme
(use-package doom-themes
             :ensure t
             :config
             (load-theme 'doom-molokai t))

;; Helm
(use-package helm
             :ensure t
             :init
             (setq helm-M-x-fuzzy-match t
                   helm-mode-fuzzy-match t
                   helm-buffers-fuzzy-matching t
                   helm-recentf-fuzzy-match t
                   helm-locate-fuzzy-match t
                   helm-semantic-fuzzy-match t
                   helm-imenu-fuzzy-match t
                   helm-completion-in-region-fuzzy-match t
                   helm-candidate-number-list 80
                   helm-split-window-inside-p t
                   helm-move-to-line-cycle-in-source t
                   helm-echo-input-in-header-line t
                   helm-autoresize-max-height 0
                   helm-autoresize-min-height 20)
             :config
             (helm-mode 1))

;; RipGrep
(use-package helm-rg :ensure t)

;; Projectile
(use-package projectile
             :ensure t
             :init
             (setq projectile-require-project-root nil)
             :config
             (projectile-mode 1))

;; Helm Projectile
(use-package helm-projectile
             :ensure t
             :init
             (setq helm-projectile-fuzzy-match t)
             :config
             (helm-projectile-on))

;; Helm Gtags
(use-package helm-gtags
             :defer t
             :ensure t
             :init
             (progn
               (setq helm-gtags-ignore-case t
                     helm-gtags-auto-update t
                     helm-gtags-prefix-key "SPC"
                     helm-gtags-use-input-at-cursor t
                     helm-gtags-pulse-at-cursor t)
               (add-hook 'c-mode-hook 'helm-gtags-mode)))

;; All The Icons
(use-package all-the-icons :ensure t)

;; NeoTree
(use-package neotree
             :ensure t
             :init
             (setq neo-theme (if (display-graphic-p) 'icons 'arrow)))

;; Which Key
(use-package which-key
             :ensure t
             :init
             (setq which-key-separator " ")
             (setq which-key-prefix-prefix "+")
             :config
             (which-key-mode))

;; Restart emacs from within emacs
(use-package restart-emacs
             :ensure t)

;; For Haskell & Rust Support
(use-package lsp-mode
             :defer t
             :ensure t
             :commands lsp)
(use-package lsp-ui
             :commands lsp-ui-mode
             :config
             ((add-hook 'lsp-mode-hook 'lsp-ui-mode)
              (add-hook 'haskell-mode-hook 'flycheck-mode)))
(use-package company-lsp
             :commands company-lsp)

(use-package lsp-haskell
             :defer t
             :ensure t
             :config
             ((add-hook 'haskell-mode-hook #'lsp)
              (setq lsp-haskell-process-path-hie "~/.local/bin/hie-wrapper")))

(use-package rust-mode
             :defer t
             :ensure t)

;; Git Support
(use-package magit
             :defer t
             :ensure t)
(use-package evil-magit
             :defer t
             :ensure t)
(use-package helm-git-grep
             :defer t
             :ensure t)
(use-package helm-gitignore
             :defer t
             :ensure t)
(use-package git-commit
             :defer t
             :ensure t)
(use-package git-messenger
             :defer t
             :ensure t
             :config
             (define-key git-messenger-map [escape] 'git-messenger:popup-close))
(use-package gitattributes-mode
             :defer t)
(use-package gitconfig-mode
             :defer t)
(use-package gitignore-mode
             :defer t)

;; Custom keybinding
(use-package general
             :ensure t
             :config (general-define-key
                       :states '(normal visual insert emacs)
                       :prefix "SPC"
                       :non-normal-prefix "M-SPC"
                       "/"   '(helm-projectile-rg
                                :which-key "ripgrep")
                       "TAB" '(switch-to-prev-buffer
                                :which-key "previous buffer")
                       "SPC" '(helm-M-x :which-key "M-x")
                       "pf"  '(helm-projectile-find-file
                                :which-key "find files")
                       "pp"  '(helm-projectile-switch-project
                                :which-key "switch project")
                       "pb"  '(helm-projectile-switch-to-buffer
                                :which-key "switch buffer")
                       "pr"  '(helm-show-kill-ring
                                :which-key "show kill ring")
                       ;; Buffers
                       "bb"  '(helm-mini :which-key "buffers list")
                       ;; Window
                       "wl"  '(windmove-right :which-key "move right")
                       "wh"  '(windmove-left :which-key "move left")
                       "wk"  '(windmove-up :which-key "move up")
                       "wj"  '(windmove-down :which-key "move bottom")
                       "w/"  '(split-window-right :which-key "split right")
                       "w-"  '(split-window-below :which-key "split bottom")
                       "wx"  '(delete-window :which-key "delete window")
                       "qz"  '(delete-frame :which-key "delete frame")
                       "qq"  '(kill-emacs :which-key "quit")
                       "qr"  '(restart-emacs :which-key "restart emacs")
                       ;; NeoTree
                       "ft"  '(neotree-toggle :which-key "toggle neotree")
                       ;; Others
                       "at"  '(ansi-term :which-key "open terminal")
                       ;; Gtags
                       "mgc" '(helm-gtags-create-tags
                                :which-key "create tag db")
                       "mgd" '(helm-gtags-find-tag
                                :which-key "find definitions")
                       "mgf" '(helm-gtags-select-path
                                :which-key "jump to a file in tag db")
                       "mgG" '(helm-gtags-dwim-other-window
                                :which-key "jump to location based on context")
                       "mgi" '(helm-gtags-tags-in-this-function
                                :which-key "present tags in current function")
                       "mgl" '(helm-gtags-parse-file
                                :which-key "jump to definitions in file")
                       "mgn" '(helm-gtags-next-history
                                :which-key "jump to next location in context stack")
                       "mgp" '(helm-gtags-previous-history
                                :which-key "jump to previous location in context stack")
                       "mgr" '(helm-gtags-find-rtag
                                :which-key "find references")
                       "mgR" '(helm-gtags-resume
                                :which-key "resume previous helm-gtags session")
                       "mgs" '(helm-gtags-select
                                :which-key "select any tag in project retrieved by gtags")
                       "mgS" '(helm-gtags-show-stack
                                :which-key "show stack of visited locations")
                       "mgu" '(helm-gtags-update-tags
                                :which-key "create tag db")
                       ;; Git key bindings
                       "gc"  '(magit-clone :which-key "magit clone")
                       "gff" '(magit-find-file :which-key "magit find file")
                       "gfl" '(magit-log-buffer-file
                                :which-key "magit log buffer file")
                       "gfd" '(magit-diff-buffer-file-popup
                                :which-key "magit diff buffer file popup")
                       "gi"  '(magit-init :which-key "magit initialize")
                       "gL"  '(magit-list-repositories
                                :which-key "magit list repositories")
                       "gm"  '(magit-dispatch-popup "magit dispatch popup")
                       "gs"  '(magit-status "open Magit status buffer")
                       "gS"  '(magit-stage-file "magit stage file")
                       "gU"  '(magit-unstage-file "magit unstage file")
                       "g/"  '(helm-git-grep :which-key "open helm git grep")
                       "g*"  '(helm-git-grep-at-point
                                :which-key "open helm git grep at point")
                       ))

;; Fancy titlebar for MacOS
(add-to-list 'default-frame-alist '(ns-transparent-titlebar . t))
(add-to-list 'default-frame-alist '(ns-appearance . dark))
(setq ns-use-proxy-icon  nil)
(setq frame-title-format nil)

;; Flycheck
(use-package flycheck
             :ensure t
             :init (global-flycheck-mode))
;; To disable flycheck while working with this file
(setq-default flycheck-disabled-checkers '(emacs-lisp-checkdoc))

;; Company mode
(use-package company
             :ensure t
             :init
             (setq company-minimum-prefix-length 3)
             (setq company-auto-complete nil)
             (setq company-idle-delay 0)
             (setq company-require-match 'never)
             (setq company-frontends
                   '(company-pseudo-tooltip-unless-just-one-frontend
                      company-preview-frontend company-echo-metadata-frontend))
             (setq tab-always-indent 'complete)
             (defvar completion-at-point-functions-saved nil)
             :config
             (global-company-mode 1)
             (define-key company-active-map (kbd "TAB")
                         'company-complete-common-or-cycle)
             (define-key company-active-map (kbd "<tab>")
                         'company-complete-common-or-cycle)
             (define-key company-active-map (kbd "S-TAB")
                         'company-select-previous)
             (define-key company-active-map (kbd "<backtab>")
                         'company-select-previous)
             (define-key company-mode-map [remap indent-for-tab-command]
                         'company-indent-for-tab-command)
             (defun company-indent-for-tab-command (&optional arg)
               (interactive "P")
               (let ((completion-at-point-functions-saved completion-at-point-functions)
                     (completion-at-point-functions '(company-complete-common-wrapper)))
                 (indent-for-tab-command arg)))

(defun company-complete-common-wrapper ()
  (let ((completion-at-point-functions completion-at-point-functions-saved))
    (company-complete-common))))

;; Powerline
(use-package spaceline
             :ensure t
             :init
             (setq powerline-default-separator 'slant)
             :config
             (spaceline-emacs-theme)
             (spaceline-toggle-minor-modes-off)
             (spaceline-toggle-buffer-size-off)
             (spaceline-toggle-evil-state-on))

;;;;;;;;;;;;;;;;;;;;;;;
;; Language Supports ;;
;;;;;;;;;;;;;;;;;;;;;;;

;;; C
(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)))

(add-hook 'c-mode-common-hook
          (lambda ()
            ;; Add kernel style
            (c-add-style
              "linux-tabs-only"
              '("linux" (c-offsets-alist
                          (arglist-cont-nonempty
                            c-lineup-gcc-asm-reg
                            c-lineup-arglist-tabs-only))))))

(add-hook 'c-mode-hook
          (lambda ()
            (let ((filename (buffer-file-name)))
            ;; Enable kernel mode for the appropriate files
            (when (and filename
                       (string-match (expand-file-name "~/ged4k/linux-xlnx")
                                     filename))
              (setq indent-tabs-mode t)
              (setq show-trailing-whitespace t)
              (c-set-style "linux-tabs-only")))))

(defun helm-gtags-dwim-other-window ()
  ;; Enable helm-gtags-dwim in the other window
  (interactive)
  (let ((helm-gtags--use-otherwin t)
        (split-height-threshold nil)
        (split-width-threshold 140))
    (helm-gtags-dwim)))

;;; init.el ends