;;; core-ui.el --- interface settings

(setq-default
 blink-matching-paren nil ; don't blink matching delimiters--too distracting
 show-paren-delay 0.075

 cursor-in-non-selected-windows nil ; no cursors except in active buffer
 highlight-nonselected-windows nil
 hl-line-sticky-flag nil ; only highlight in one window

 uniquify-buffer-name-style nil ; my mode-line does this for me
 visible-bell nil
 visible-cursor nil
 x-stretch-cursor t
 use-dialog-box nil            ; always avoid GUI
 redisplay-dont-pause t        ; don't pause display on input
 indicate-buffer-boundaries t  ; show indicators where buffer starts/ends
 indicate-empty-lines t        ; show indicators on empty lines
 fringes-outside-margins t     ; switches order of fringe and margin
 split-width-threshold nil     ; favor horizontal splits
 show-help-function nil        ; hide :help-echo text

 jit-lock-defer-time 0.04
 jit-lock-stealth-nice 0.1
 jit-lock-stealth-time 0.2
 jit-lock-stealth-verbose nil

 ;; Disable bidirectional text support for slight performance bonus
 bidi-display-reordering        nil

 ;; Minibuffer resizing
 resize-mini-windows            'grow-only
 max-mini-window-height         0.3

 ;; Remove arrow on the right fringe when wrapped
 fringe-indicator-alist (delq (assoc 'continuation fringe-indicator-alist)
                              fringe-indicator-alist))

(fset 'yes-or-no-p 'y-or-n-p)           ; y/n instead of yes/no

;; Ask for confirmation on exit only if there are real buffers left
(when window-system
  (setq confirm-kill-emacs
        (lambda (_)
          (if (narf/get-real-buffers)
              (y-or-n-p ">> Gee, I dunno Brain... Are you sure?")
            t))))

(blink-cursor-mode  1)    ; blink cursor
(tooltip-mode      -1)    ; show tooltips in echo area

;; set up minibuffer and fringe
(if (not window-system)
    (menu-bar-mode -1)
  (scroll-bar-mode -1)  ; no scrollbar
  (tool-bar-mode   -1)  ; no toolbar

  ;; full filename in frame title
  (setq frame-title-format '(buffer-file-name "%f" ("%b")))

  ;; set fonts
  (narf/load-font narf-default-font)
  (set-face-attribute 'default t :font narf-default-font)

  ;; standardize fringe width
  (fringe-mode narf-fringe-size)

  ;; Show tilde in margin on empty lines
  (define-fringe-bitmap 'tilde [64 168 16] nil nil 'center)
  (setcdr (assq 'empty-line fringe-indicator-alist) 'tilde)
  (set-fringe-bitmap-face 'tilde 'font-lock-comment-face)

  ;; Brighter minibuffer when active
  (defface narf-minibuffer-active '((t (:inherit mode-line)))
    "Face for active minibuffer")
  (defun narf|minibuffer-setup ()
    (set-window-fringes (selected-window) 0 0 nil)
    (make-local-variable 'face-remapping-alist)
    (add-to-list 'face-remapping-alist '(default narf-minibuffer-active)))
  (add-hook! minibuffer-setup 'narf|minibuffer-setup)
  (add-hook! 'after-init-hook (set-window-fringes (minibuffer-window) 0 0 nil)))

;; Try to display unicode characters without upsetting line-hieght (as much as possible)
(mapc (lambda (set)
        (let ((font  (car set))
              (chars (cadr set))
              (size  (caddr set)))
          (mapc (lambda (x) (set-fontset-font
                        "fontset-default" `(,x . ,x)
                        (font-spec :name font :size size) nil 'prepend))
                chars)))
      '(("DejaVu Sans" (?☑ ?☐ ?⚠ ?★ ?λ ?♭ ?♯
                        ?➊ ?➋ ?➌ ?➍ ?➎ ?❻ ?➐ ?➑ ?➒ ?➓))
        ;; File attachment symbols (for org-mode)
        ("FontAwesome" (? ? ? ? ? ? ? ? ?) 13)
        ;; Certain math symbols
        ("Hack"        (?× ?∙ ?÷ ?⌉ ?⌈ ?⌊ ?⌋
                        ?∩ ?∪ ?⊆ ?⊂ ?⊄ ?⊇ ?⊃ ?⊅
                        ?⇒ ?⇐ ?⇔ ?↔ ?→ ?≡ ?∴ ?∵ ?⊕ ?∀ ?∃ ?∄ ?∈ ?∉
                        ?∨ ?∧ ?¬))))

;; on by default in Emacs 25; I prefer to enable on a mode-by-mode basis, so disable it
(when (and (featurep 'eldoc) (>= emacs-major-version 25))
  (global-eldoc-mode -1))

;; line highlighting
(add-hook! (prog-mode markdown-mode) 'hl-line-mode)

;; Disable line highlight in visual mode
(defvar narf--hl-line-mode nil)
(make-variable-buffer-local 'narf--hl-line-mode)

(defun narf|hl-line-on ()  (if narf--hl-line-mode (hl-line-mode +1)))
(defun narf|hl-line-off () (if narf--hl-line-mode (hl-line-mode -1)))

(add-hook! hl-line-mode (if hl-line-mode (setq narf--hl-line-mode t)))
(add-hook 'evil-visual-state-entry-hook 'narf|hl-line-off)
(add-hook 'evil-visual-state-exit-hook  'narf|hl-line-on)

;; Hide modeline in help windows
(defun narf|hide-mode-line ()
  (setq mode-line-format nil))
(add-hook 'help-mode-hook 'narf|hide-mode-line)

;; Highlight TODO/FIXME/NOTE tags
(defface narf-todo-face  '((t (:inherit font-lock-warning-face)))
  "Face for TODOs")
(defface narf-fixme-face '((t (:inherit font-lock-warning-face)))
  "Face for FIXMEs")
(defface narf-note-face  '((t (:inherit font-lock-warning-face)))
  "Face for NOTEs")
(add-hook! (prog-mode emacs-lisp-mode)
  (font-lock-add-keywords nil '(("\\<\\(TODO\\((.+)\\)?:?\\)"  1 'narf-todo-face prepend)
                                ("\\<\\(FIXME\\((.+)\\)?:?\\)" 1 'narf-fixme-face prepend)
                                ("\\<\\(NOTE\\((.+)\\)?:?\\)"  1 'narf-note-face prepend))))

;; Fade out when unfocused
(add-hook! focus-in  (set-frame-parameter nil 'alpha 100))
(add-hook! focus-out (set-frame-parameter nil 'alpha 85))


;;
;; Plugins
;;

(use-package visual-fill-column :defer t)

(use-package highlight-indentation
  :commands (highlight-indentation-mode highlight-indentation-current-column-mode)
  :init
  (add-hook! (web-mode nxml-mode yaml-mode json-mode scss-mode
              c-mode-common ruby-mode python-mode lua-mode)
    'highlight-indentation-mode)

  :config
  ;; A long-winded method for ensuring whitespace is maintained (so that
  ;; highlight-indentation-mode can display them consistently)
  (add-hook! highlight-indentation-mode
    (if highlight-indentation-mode
        (progn
          (narf/add-whitespace)
          (highlight-indentation-set-offset tab-width)
          (add-hook 'after-save-hook 'narf/add-whitespace nil t))
     (remove-hook 'after-save-hook 'narf/add-whitespace t)))
  (add-hook 'before-save-hook 'delete-trailing-whitespace))

(use-package highlight-numbers :commands (highlight-numbers-mode))

(use-package imenu-list
  :commands (imenu-list-minor-mode)
  :config
  (setq imenu-list-mode-line-format nil
        imenu-list-position 'right
        imenu-list-size 35)

  (map! :map imenu-list-major-mode-map
        :n [escape] 'narf/imenu-list-quit
        :n "RET" 'imenu-list-goto-entry
        :n "SPC" 'imenu-list-display-entry
        :n [tab] 'hs-toggle-hiding))

(use-package rainbow-delimiters
  :commands rainbow-delimiters-mode
  :init
  (add-hook! (emacs-lisp-mode lisp-mode js2-mode scss-mode c-mode-common)
    'rainbow-delimiters-mode)
  :config
  (setq rainbow-delimiters-max-face-count 4))

(use-package rainbow-mode
  :commands (rainbow-mode)
  :init
  ;; hl-line-mode and rainbow-mode don't play well together
  (add-hook! rainbow-mode
    (when narf--hl-line-mode
      (hl-line-mode (if rainbow-mode -1 1)))))

(use-package nlinum
  :commands nlinum-mode
  :preface
  (defface linum-highlight-face '((t (:inherit linum))) "Face for line highlights")
  (defvar narf--hl-nlinum-overlay nil)
  (defvar narf--hl-nlinum-line nil)
  (defvar nlinum-format "%4d ")
  (setq linum-format "%3d ")
  :init
  (defun narf|nlinum-enable ()
    (nlinum-mode +1)
    (add-hook 'post-command-hook 'narf|nlinum-hl-line))

  (add-hook!
    (markdown-mode prog-mode scss-mode web-mode conf-mode)
    'narf|nlinum-enable)
  :config
  (defun narf|nlinum-unhl-line ()
    "Unhighlight line number"
    (when narf--hl-nlinum-overlay
      (let* ((disp (get-text-property
                    0 'display (overlay-get narf--hl-nlinum-overlay 'before-string)))
             (str (nth 1 disp)))
        (put-text-property 0 (length str) 'face 'linum str)
        (setq narf--hl-nlinum-overlay nil
              narf--hl-nlinum-line nil)
        disp)))

  (defun narf|nlinum-hl-line (&optional line)
    "Highlight line number"
    (let ((line-no (or line (string-to-number (format-mode-line "%l")))))
      (when (and nlinum-mode (not (eq line-no narf--hl-nlinum-line)))
        (let* ((pbol (if line
                         (save-excursion (goto-char (point-min))
                                         (forward-line line-no)
                                         (line-beginning-position))
                       (line-beginning-position)))
               (peol (1+ pbol)))
          ;; Handle EOF case
          (let ((max (point-max)))
            (when (>= peol max)
              (setq peol max)))
          (jit-lock-fontify-now pbol peol)
          (let ((ov (-first (lambda (item) (overlay-get item 'nlinum)) (overlays-in pbol peol))))
            (when ov
              (narf|nlinum-unhl-line)
              (let ((str (nth 1 (get-text-property 0 'display (overlay-get ov 'before-string)))))
                (put-text-property 0 (length str) 'face 'linum-highlight-face str)
                (setq narf--hl-nlinum-overlay ov
                      narf--hl-nlinum-line line-no))))))))

  (add-hook! nlinum-mode
    (setq nlinum--width
          (length (save-excursion (goto-char (point-max))
                                  (format-mode-line "%l"))))))


;; Mode-line ;;;;;;;;;;;;;;;;;;;;;;;;;;;

(use-package spaceline
  :init
  (defvar narf--env-version nil)
  (defvar narf--env-command nil)
  (make-variable-buffer-local 'narf--env-version)
  (make-variable-buffer-local 'narf--env-command)
  :config
  (setq-default
   powerline-default-separator nil
   powerline-height 20
   spaceline-highlight-face-func 'spaceline-highlight-face-evil-state)

  (defface mode-line-is-modified nil "Face for mode-line modified symbol")
  (defface mode-line-buffer-file nil "Face for mode-line buffer file path")

  ;; Custom modeline segments
  (spaceline-define-segment *buffer-path
    (if buffer-file-name
        (let* ((project-path (let (projectile-require-project-root) (projectile-project-root)))
               (buffer-path (f-relative buffer-file-name project-path))
               (max-length (truncate (/ (window-width) 2)))
               (path-len (length buffer-path)))
          (if (> path-len max-length)
              (f-filename buffer-path)
            (concat (f-filename project-path) "/" buffer-path)))
      "%b")
    :face (if active 'mode-line-buffer-file 'mode-line-inactive)
    :skip-alternate t
    :tight-right t)

  (spaceline-define-segment *remote-host
    "Hostname for remote buffers."
    (concat "@" (file-remote-p default-directory 'host))
    :when (file-remote-p default-directory 'host))

  (spaceline-define-segment *buffer-modified
    (concat
     (when buffer-file-name
       (concat
        (when (buffer-modified-p) "[+]")
        (unless (file-exists-p buffer-file-name) "[!]")))
     (if buffer-read-only "[RO]"))
    :face mode-line-is-modified
    :when (not (string-prefix-p "*" (buffer-name)))
    :skip-alternate t
    :tight t)

  (spaceline-define-segment *buffer-position
    "A more vim-like buffer position."
    (let ((start (window-start))
          (end (window-end))
          (pend (point-max)))
      (if (and (eq start 1)
               (eq end pend))
          ":All"
        (let ((perc (/ end 0.01 pend)))
          (cond ((eq start 1) ":Top")
                ((>= perc 100) ":Bot")
                (t (format ":%d%%%%" perc))))))
    :tight t)

  (spaceline-define-segment *vc
    "Version control info"
    (powerline-raw
     (concat (replace-regexp-in-string
              (format "^ %s" (vc-backend buffer-file-name))
              "" vc-mode)))
    :when (and active vc-mode)
    :face other-face
    :tight-right t)

  (spaceline-define-segment *env-version
    "Shows the environment version of a mode (e.g. pyenv for python or rbenv for ruby).
See `define-env-command!' to define one for a mode."
    narf--env-version
    :when narf--env-version
    :face other-face
    :skip-alternate t
    :tight-right t)

  ;; search indicators
  (defface mode-line-count-face nil "")
  (make-variable-buffer-local 'anzu--state)
  (spaceline-define-segment *anzu
    "Show the current match number and the total number of matches. Requires
anzu to be enabled."
    (let ((here anzu--current-position)
          (total anzu--total-matched))
      (format " %s/%d%s "
              (anzu--format-here-position here total)
              total (if anzu--overflow-p "+" "")))
    :face (if active 'mode-line-count-face 'mode-line-inactive)
    :when (and (> anzu--total-matched 0) (evil-ex-hl-active-p 'evil-ex-search))
    :skip-alternate t
    :tight t)

  ;; TODO mode-line-iedit-face default face
  (spaceline-define-segment *iedit
    "Show the number of matches and what match you're on (or after). Requires iedit."
    (let ((this-oc (iedit-find-current-occurrence-overlay))
          (length  (or (ignore-errors (length iedit-occurrences-overlays)) 0)))
      (format " %s/%s "
              (save-excursion
                (unless this-oc
                  (iedit-prev-occurrence)
                  (setq this-oc (iedit-find-current-occurrence-overlay)))
                (if this-oc
                    ;; NOTE: Not terribly reliable
                    (- length (-elem-index this-oc iedit-occurrences-overlays))
                  "-"))
              length))
    :when (bound-and-true-p iedit-mode)
    :tight t
    :face (if active 'mode-line-count-face 'mode-line-inactive)
    :skip-alternate t)

  (defface mode-line-substitute-face nil "")
  (spaceline-define-segment *evil-substitute
    "Show number of :s matches in real time."
    (let ((range (if evil-ex-range
                     (cons (car evil-ex-range) (cadr evil-ex-range))
                   (cons (line-beginning-position) (line-end-position))))
          (pattern (car-safe (evil-delimited-arguments evil-ex-argument 2))))
      (if pattern
          (format " %s matches "
                  (count-matches pattern (car range) (cdr range))
                  evil-ex-argument)
        " ... "))
    :when (and (evil-ex-p) (evil-ex-hl-active-p 'evil-ex-substitute))
    :tight t
    :face (if active 'mode-line-count-face 'mode-line-inactive)
    :skip-alternate t)

  (spaceline-define-segment *macro-recording
    "Show when recording macro"
    (format " %s ▶ " (char-to-string evil-this-macro))
    :when (and active defining-kbd-macro)
    :face highlight-face
    :tight t
    :skip-alternate t)

  (spaceline-define-segment *buffer-encoding-abbrev
    "The line ending convention used in the buffer."
    (symbol-name buffer-file-coding-system)
    :when (not (string-match-p "\\(utf-8\\|undecided\\)"
                               (symbol-name buffer-file-coding-system))))

  (spaceline-define-segment *major-mode
    (powerline-raw
     (concat
      (and (featurep 'face-remap) (/= text-scale-mode-amount 0) (format "(%+d) " text-scale-mode-amount))
      (if (stringp mode-name) mode-name (car mode-name))
      (if (stringp mode-line-process) mode-line-process)))
    :tight-right t)

  (defun narf--col-at-pos (pos)
    (save-excursion (goto-char pos) (current-column)))
  (spaceline-define-segment *selection-info
    "Information about the size of the current selection, when applicable.
Supports both Emacs and Evil cursor conventions."
    (let ((reg-beg (region-beginning))
          (reg-end (region-end)))
      (let* ((lines (count-lines reg-beg (min (1+ reg-end) (point-max))))
             (chars (- (1+ reg-end) reg-beg))
             (cols (1+ (abs (- (narf--col-at-pos reg-end)
                               (narf--col-at-pos reg-beg)))))
             (evil (eq 'visual evil-state))
             (rect (or (bound-and-true-p rectangle-mark-mode)
                       (and evil (eq 'block evil-visual-selection))))
             (multi-line (or (> lines 1) (eq 'line evil-visual-selection))))
        (cond
         (rect (format "%dx%dB" lines (if evil cols (1- cols))))
         (multi-line
          (if (and (eq evil-state 'visual) (eq evil-this-type 'line))
              (format "%dL" lines)
            (format "%dC %dL" chars lines)))
         (t (format "%dC" (if evil chars (1- chars)))))))
    :when (eq 'visual evil-state)
    :face highlight-face
    :skip-alternate t)

  ;; flycheck
  (defun narf--flycheck-count (state)
    "Return flycheck information for the given error type STATE."
    (let* ((counts (flycheck-count-errors flycheck-current-errors))
           (errorp (flycheck-has-current-errors-p state))
           (running (eq 'running flycheck-last-status-change))
           (err (cdr (assq state counts))))
      (when errorp (if running "?" err))))

  (defface spaceline-flycheck-error
    '((t (:foreground "#FC5C94" :distant-foreground "#A20C41")))
    "Face for flycheck error feedback in the modeline.")
  (defface spaceline-flycheck-warning
    '((t (:foreground "#F3EA98" :distant-foreground "#968B26")))
    "Face for flycheck warning feedback in the modeline.")
  (defface spaceline-flycheck-info
    '((t (:foreground "#8DE6F7" :distant-foreground "#21889B")))
    "Face for flycheck info feedback in the modeline.")

  (defvar narf--flycheck-err-cache nil "")
  (defvar narf--flycheck-cache nil "")
  (spaceline-define-segment *flycheck
    "Persistent and cached flycheck indicators in the mode-line."
    (or (and (or (eq narf--flycheck-err-cache narf--flycheck-cache)
                 (memq flycheck-last-status-change '(running not-checked)))
             narf--flycheck-cache)
        (and (setq narf--flycheck-err-cache flycheck-current-errors)
             (setq narf--flycheck-cache
                   (let ((fe (narf--flycheck-count 'error))
                         (fw (narf--flycheck-count 'warning))
                         (fi (narf--flycheck-count 'info)))
                     (concat
                      (when fe (powerline-raw (format " ⚠%s " fe) 'spaceline-flycheck-error))
                      (when fw (powerline-raw (format " ⚠%s " fw) 'spaceline-flycheck-warning))
                      (when fi (powerline-raw (format " ⚠%s " fi) 'spaceline-flycheck-info)))))))
    :when (and (bound-and-true-p flycheck-mode)
               (or flycheck-current-errors
                   (eq 'running flycheck-last-status-change)))
    :tight t
    :skip-alternate t)

  (spaceline-define-segment *hud
    "A HUD that shows which part of the buffer is currently visible."
    (powerline-hud (if active 'spaceline-highlight-face 'region) line-face 1)
    :tight-right t)

  (spaceline-define-segment *buffer-size
    (powerline-buffer-size)
    :tight-right t
    :skip-alternate t)

  (defun narf-spaceline-init ()
    (spaceline-install
     ;; Left side
     '(((*macro-recording *anzu *iedit *evil-substitute *flycheck)
        :fallback *buffer-size)
       (*buffer-path *remote-host)
       *buffer-modified
       *vc
       )
     ;; Right side
     '(*selection-info
       *buffer-encoding-abbrev
       *major-mode
       *env-version
       (global :when active)
       ("%l/%c" *buffer-position)
       *hud
       )))

  ;; Initialize modeline
  (narf-spaceline-init))

(provide 'core-ui)
;;; core-ui.el ends here