;; setup packages
(require 'package)
(setq package-user-dir (expand-file-name "var/elpa" user-emacs-directory)
      package-enable-at-startup nil
      package-archives (append package-archives
                               '(("melpa" . "https://melpa.milkbox.net/packages/"))))

(package-initialize)

(unless package-archive-contents
  (message "Refreshing ELPA package archives...")
  (package-refresh-contents))

;; install the package 'use-package' unless it's already installed
(unless (package-installed-p 'use-package)
  (progn
    (package-install 'use-package)))

;; ... and load 'use-package'
(require 'use-package)

(use-package server
  ;; start emacs server if not already running
  :config
  (unless (server-running-p) (server-start)))

(use-package  diminish
  ;; remove clutter from the mode line
  :ensure t)

(use-package ag
  ;; interface to the 'ag' tool
  :ensure t
  :commands (counsel-ag ag)
  :bind (:map ag-mode-map
              ("p" . compilation-previous-error)
              ("n" . compilation-next-error)
              ("N" . compilation-next-file)
              ("P" . compilation-previous-file))
  :config
  (setq ag-highlight-search t
        ag-reuse-buffers t
        ag-reuse-window t))

(use-package autorevert
  ;; automatically revert the buffer if the content changed on disk
  :diminish auto-revert-mode)

(use-package counsel
  ;; completion functions for ivy
  :ensure t

  :bind*
  (("M-x"     . counsel-M-x)
   ("C-s"     . counsel-grep-or-swiper)
   ("C-x C-f" . counsel-find-file)
   ("C-x C-r" . counsel-recentf)
   ("C-c f"   . counsel-git)
   ("C-c s"   . counsel-git-grep)
   ("C-c /"   . counsel-ag))

  :config
  (setq counsel-find-file-at-point t))

(use-package dired
  ;; configuration for dired
  :bind ("C-x C-d" . dired)

  :config
  (let ((gls "/opt/twitter/bin/gls"))
    (if (file-exists-p gls)
        (setq insert-directory-program gls
              dired-listing-switches "-aBhl --group-directories-first")))
  (use-package dired-x
    :init
    (add-hook 'dired-load-hook (lambda () (load "dired-x")))
    :config
    (add-hook 'dired-mode-hook #'dired-omit-mode)
    (setq dired-omit-verbose nil)
    (setq dired-omit-files
          (concat dired-omit-files "\\|^.DS_Store$\\|^.projectile$\\|^.git$"))))

(use-package dockerfile-mode
  ;; support for dockerfile mode
  :ensure t)

(use-package lisp-mode
  ;; simple configuration for various lisp mode
  :config
  (add-hook 'emacs-lisp-mode-hook
            (lambda()
              (setq mode-name "λ"))))

(use-package eldoc
  ;; documentation with eldoc
  :ensure t

  :commands eldoc-mode

  :diminish ""

  :init
  (add-hook 'emacs-lisp-mode-hook 'eldoc-mode)
  (add-hook 'lisp-interaction-mode-hook 'eldoc-mode))

(use-package exec-path-from-shell
  ;; environment fixup for macOS.
  :ensure t

  :if (and (eq system-type 'darwin) (display-graphic-p))

  :init
  (setq exec-path-from-shell-check-startup-files nil)

  :config
  (progn
    (setq exec-path-from-shell-debug t)
    (exec-path-from-shell-initialize)))

(use-package flycheck
  ;; check syntax
  :ensure t

  :config
  (progn

    (add-hook 'prog-mode-hook 'flycheck-mode)

    (setq-default flycheck-disabled-checkers '(emacs-lisp-checkdoc))
    (setq flycheck-highlighting-mode 'lines)
    (setq flycheck-check-syntax-automatically '(mode-enabled save))))

(use-package flyspell
  ;; check the spelling
  :ensure t

  :init
  (progn
    (setq ispell-program-name "aspell"
          ispell-list-command "--list")
    (add-hook 'text-mode-hook 'flyspell-mode))

  :config
  (use-package flyspell-popup
    :ensure t
    :bind ("C-:" . flyspell-popup-correct)))

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

  :ensure t

  :config
  (progn
    (when (memq window-system '(mac ns x))
      (dolist (var '("GOPATH"))
        (unless (getenv var)
          (exec-path-from-shell-copy-env var))))

    (use-package go-eldoc
      :ensure t
      :config
      (add-hook 'go-mode-hook 'go-eldoc-setup))

    (use-package gotest
      :ensure t)

    (use-package go-guru
      :ensure t)

    (defun fc/my-go-hook ()
      (set (make-local-variable 'compile-command)
           "go build -v && go test -v && go vet")
      (setq-local tab-width 4)
      (make-variable-buffer-local 'whitespace-style)
      (setq whitespace-style (delq 'tabs whitespace-style)))

    (add-hook 'before-save-hook 'gofmt-before-save)
    (add-hook 'go-mode-hook 'fc/my-go-hook)))

(use-package ibuffer
  ;; configuration for ibuffer
  :ensure t
  :defer t
  :bind ("C-x C-b" . ibuffer)
  :init
  (setq-default ibuffer-eliding-string "…")
  (setq ibuffer-show-empty-filter-groups nil
        ibuffer-formats '((mark modified read-only " "
                                (name 30 30 :left :elide)
                                " "
                                (size 9 -1 :right)
                                " "
                                (mode 16 16 :left :elide)
                                " " filename-and-process)
                          (mark " "
                                (name 16 -1)
                                " " filename))
        ibuffer-saved-filter-groups
        (quote (("default"
                 ("dired"  (mode . dired-mode))
                 ("elisp"  (mode . emacs-lisp-mode))
                 ("emacs"  (or (name . "^\\*.*\\*$") (mode . fundamental-mode)))
                 ("go"     (mode . go-mode))
                 ("java"   (mode . java-mode))
                 ("json"   (mode . json-mode))
                 ("lisp"   (mode . lisp-mode))
                 ("magit"  (mode . magit-mode))
                 ("puppet" (mode . puppet-mode))
                 ("python" (mode . python-mode))
                 ("repl"   (name . "repl"))
                 ("ruby"   (mode . ruby-mode))
                 ("sh"     (mode . sh-mode))
                 ("text"   (mode . text-mode))))))

  (add-hook 'ibuffer-mode-hook  ;; organise by filter-groups
            '(lambda ()
               (ibuffer-auto-mode 1)
               (setq mode-name "≣")
               (ibuffer-switch-to-saved-filter-groups "default"))))

(use-package ivy
  ;; completion system
  :diminish (ivy-mode . "")

  :bind ("C-c m" . ivy-switch-project)

  :config
  (ivy-mode 1)
  (setq ivy-use-virtual-buffers t
        ivy-height 10
        ivy-count-format "(%d/%d) "
        ivy-initial-inputs-alist nil
        ivy-use-ignore-default 'always
        ivy-ignore-buffers '("company-statistics-cache.el" "company-statistics-autoload.el")
        ivy-re-builders-alist '((swiper . ivy--regex-ignore-order)
                                (t      . ivy--regex-fuzzy)
                                (t      . ivy--regex-ignore-order)))

  (defun ivy-switch-project ()
    (interactive)
    (ivy-read
     "Switch to project: "
     (if (projectile-project-p)
         (cons (abbreviate-file-name (projectile-project-root))
               (projectile-relevant-known-projects))
       projectile-known-projects)
     :action #'projectile-switch-project-by-name))

  (ivy-set-actions
   'ivy-switch-project
   '(("d" dired "Open Dired in project's directory")
     ("v" counsel-projectile "Open project root in vc-dir or magit")
     ("c" projectile-compile-project "Compile project")
     ("r" projectile-remove-known-project "Remove project(s)"))))

(use-package json-mode
  ;; mode to support json files
  :ensure t

  :mode "\\.json\\'"

  :config
  (setq json-reformat:indent-width 2))

(use-package magit
  ;; interface to git
  :ensure t

  :mode (("differential-update-comments" . git-commit-mode)
         ("new-commit"                   . git-commit-mode))

  :bind (("C-x g s" . magit-status)
         ("C-x g b" . magit-checkout))

  :init
  (progn
    (setq magit-completing-read-function 'ivy-completing-read))

  :config
  (progn
    (global-git-commit-mode)
    (use-package git-commit :ensure t :defer t)
    (add-hook 'magit-mode-hook
              (lambda()
                (setq mode-name "⎇")))
    (add-hook 'magit-log-edit-mode-hook
              #'(lambda ()
                  (set-fill-column 72)
                  (flyspell-mode)))))

(use-package make-mode
  ;; mode to support Makefile
  :config
  (add-hook 'makefile-mode-hook (lambda ()
                                  (setq-local tab-width 2))))

(use-package markdown-mode
  ;; mode to support files in the Markdown format
  :ensure t

  :commands (markdown-mode gfm-mode)

  :mode (("\\.md\\'"       . gfm-mode)
         ("\\.markdown\\'" . gfm-mode))

  :init (setq markdown-command "pandoc -f markdown_github -c https://goo.gl/OVmlwT --self-contained")

  :config
  (add-hook 'gfm-mode-hook 'visual-line-mode))

(use-package midnight
  ;; clean old buffers at midnight
  :ensure t
  :config
  (midnight-mode t))

(use-package org
  :defer t
  :init
  (progn
    (setq org-startup-indented t)
    (org-babel-do-load-languages 'org-babel-load-languages
                                 '(
                                   (sh . t))))
  :config
  (add-hook 'org-mode-hook #'(lambda ()
                               (visual-line-mode)
                               (org-indent-mode))))

;; (use-package phabricator
;;   ;; interface to phabricator
;;   :load-path (lambda () (expand-file-name  "~/src/phabricator.el/"))

;;   :config
;;   (setq diffusion-repo-prefix-list '(("source" "source"))))

(use-package projectile
  ;; library to interact with projects
  :ensure t

  :diminish ""

  :bind-keymap ("C-c p" . projectile-command-map)

  :init
  (add-hook 'after-init-hook #'projectile-mode)

  :config
  (use-package counsel-projectile :ensure t)
  (setq projectile-switch-project-action 'projectile-dired
        projectile-enable-caching t
        projectile-completion-system 'ivy
        projectile-known-projects-file (expand-file-name "var/projectile-bookmarks.eld" user-emacs-directory)
        projectile-cache-file (expand-file-name "var/projectile.cache" user-emacs-directory))
  (add-to-list 'projectile-globally-ignored-files ".DS_Store"))

(use-package python
  ;; configuration for Python
  :mode(("\\.aurora$" . python-mode)
        ("BUILD$"     . python-mode)
        ("\\.py$"     . python-mode))

  :interpreter ("python" . python-mode)

  :init
  (setq-default indent-tabs-mode nil)

  :config
  (setq python-indent-offset 2)
  (add-hook 'python-mode-hook 'eldoc-mode t))

(use-package recentf
  ;; configuration for recentf, to interact with recent files
  :config
  (setq recentf-save-file (expand-file-name "var/recentf" user-emacs-directory)))

(use-package sh-script
  ;; configuration to interact with shell scripts
  :mode ("bashrc" . sh-mode)

  :config
  (defun set-sh-mode-indent ()
    (setq sh-basic-offset 2
          sh-indentation 2))
  (add-hook 'sh-mode-hook 'set-sh-mode-indent)
  (add-hook 'after-save-hook 'executable-make-buffer-file-executable-if-script-p))

(use-package swiper
  ;; install swiper
  :ensure t)

(use-package tramp
  ;; configuration for tramp
  :config
  (setq tramp-default-method "ssh"
        tramp-persistency-file-name (expand-file-name "var/tramp" user-emacs-directory)))

(use-package whitespace
  ;; highlight white spaces
  :config
  (setq whitespace-style '(face trailing tabs))
  (add-hook 'prog-mode-hook 'whitespace-mode))

(use-package yaml-mode
  ;; mode to work wity YAML files
  :ensure t

  :init (add-hook 'yaml-mode-hook 'flycheck-mode)

  :mode ("\\.ya?ml\\'" . yaml-mode))