#+TITLE: My Emacs Configuration
#+AUTHOR: Amneesh Singh
#+PROPERTY: header-args:emacs-lisp :tangle yes

* Color Variables
idk random variables to match my color theme
#+begin_src emacs-lisp
  ; -*- lexical-binding: t; -*-
(setq
c-bg        "#073642"
c-fg        "#eee8d5"
c-red       "#dc322f"
c-green     "#859900"
c-yellow    "#b58900"
c-blue      "#268bd2"
c-magenta   "#d33682"
c-cyan      "#2aa198"
c-white     "#eee8d5"
c-black     "#002b36"
c-red-2     "#cb4b16"
c-green-2   "#586e75"
c-yellow-2  "#657b83"
c-blue-2    "#839496"
c-magenta-2 "#6c71c4"
c-cyan-2    "#93a1a1"
c-white-2   "#fdf6e3")
#+end_src

* Settings
** Setting the default face
#+begin_src emacs-lisp
(setq default-frame-alist '((font . "Monoid-12")))
#+end_src

** Some mode settings based on personal preferences
#+begin_src emacs-lisp
(global-hl-line-mode 1)
(scroll-bar-mode 0)
(tool-bar-mode 0)
(menu-bar-mode 0)
(fringe-mode 0)
;(cua-mode 1)
(global-display-line-numbers-mode 1)
(xterm-mouse-mode 1)
#+end_src

** Setting some variables
#+begin_src emacs-lisp
  (setq initial-major-mode 'emacs-lisp-mode
      frame-resize-pixelwise t
      auto-window-vscroll nil
      scroll-step 1
      display-line-numbers-type 'relative
      confirm-kill-processes nil
      dark-theme t
      inhibit-startup-screen t)
  (setq-default tab-width 2
                indent-tabs-mode nil)
#+end_src

** Emacs startup hook
#+begin_src emacs-lisp
(add-hook 'emacs-startup-hook
          (lambda () (delete-other-windows)) t)
#+end_src

* Packages
** Add Melpa to package archives 
#+begin_src emacs-lisp
(require 'package)
(add-to-list 'package-archives '("melpa" . "http://melpa.org/packages/"))
(package-initialize)
(require 'use-package)
#+end_src

** Visual packages
*** Add solaire mode
#+begin_src emacs-lisp
(use-package solaire-mode
  :config
  (solaire-mode))
#+end_src

*** Set theme
#+begin_src emacs-lisp
(use-package doom-themes
  :config
  (setq doom-themes-enable-bold t   
        doom-themes-enable-italic t
        doom-themes-treemacs-theme "doom-colors")
  (load-theme 'doom-solarized-dark t)
  (doom-themes-visual-bell-config)
  (doom-themes-treemacs-config)
  (doom-themes-org-config))
#+end_src

** Configure Selectrum
Enable selectrum
#+begin_src emacs-lisp
(use-package selectrum
  :config
  (define-key selectrum-minibuffer-map (kbd "C-n")  #'selectrum-next-candidate)
  (define-key selectrum-minibuffer-map (kbd "C-e")  #'selectrum-previous-candidate)
  (define-key selectrum-minibuffer-map (kbd "C-i")  #'selectrum-select-current-candidate)
  (selectrum-mode +1))
#+end_src

Add selectrum-prescient
#+begin_src emacs-lisp
(use-package selectrum-prescient
  :config
  (selectrum-prescient-mode +1)
  (prescient-persist-mode +1))
#+end_src


Add orderless for selectrum
#+begin_src emacs-lisp
(use-package orderless
  :after selectrum
  :config
  (setq completion-styles '(orderless basic))
  (add-to-list 'orderless-matching-styles 'orderless-flex)
  (savehist-mode)
  (setq orderless-skip-highlighting (lambda () selectrum-is-active))
  (setq selectrum-highlight-candidates-function #'orderless-highlight-matches))
#+end_src

** Evil
*** Configure evil mode
#+begin_src emacs-lisp
(defun my/evil-shift-right ()
  (interactive)
  (evil-shift-right evil-visual-beginning evil-visual-end)
  (evil-normal-state)
  (evil-visual-restore))

(defun my/evil-shift-left ()
  (interactive)
  (evil-shift-left evil-visual-beginning evil-visual-end)
  (evil-normal-state)
  (evil-visual-restore))

(use-package evil
  :init
  (setq-default evil-shift-width 2)
  :config
  (setq org-src-fontify-natively t
        org-src-strip-leading-and-trailing-blank-lines t
        org-src-preserve-indentation t
        org-src-tab-acts-natively t)
  (evil-set-initial-state 'vterm-mode 'insert)
  (evil-set-undo-system 'undo-tree)
  (evil-define-key 'visual global-map (kbd ">") 'my/evil-shift-right)
  (evil-define-key 'visual global-map (kbd "<") 'my/evil-shift-left)
  (evil-mode 1))
#+end_src


*** Configure undo tree
To undo and redo easily like vi
#+begin_src emacs-lisp
(use-package undo-tree
  :config
  (global-undo-tree-mode 1))
#+end_src
  
*** Configure evil-colemak-basics
To get colemak-dh bindings in evil mode
#+begin_src emacs-lisp
(use-package evil-colemak-basics
  :init
  (setq evil-colemak-basics-layout-mod 'mod-dh)
  :config
  (global-evil-colemak-basics-mode 1))
#+end_src

*** Miscellaneous evil related packages
#+begin_src emacs-lisp
(use-package evil-terminal-cursor-changer)
#+end_src

** Treemacs
*** Dependencies
#+begin_src emacs-lisp
(use-package cfrs)
#+end_src

*** Configure treemacs
#+begin_src emacs-lisp
(use-package treemacs
  :atfer cfrs
  :config
  (treemacs-filewatch-mode 1)
  (treemacs-display-current-project-exclusively)
  (treemacs-git-mode 'simple))
#+end_src

*** Configure treemacs-evil
Configure treemacs-evil to get colemak-dh bindings
#+begin_src emacs-lisp
  (use-package treemacs-evil :config
    (define-key evil-treemacs-state-map (kbd "j")   nil)
    (define-key evil-treemacs-state-map (kbd "k")   nil)
    (define-key evil-treemacs-state-map (kbd "n")   #'treemacs-next-line)
    (define-key evil-treemacs-state-map (kbd "e")   #'treemacs-previous-line)
    (define-key evil-treemacs-state-map (kbd "M-n") #'treemacs-next-neighbour)
    (define-key evil-treemacs-state-map (kbd "M-e") #'treemacs-previous-neighbour)
    (define-key evil-treemacs-state-map (kbd "M-N") #'treemacs-next-line-other-window)
    (define-key evil-treemacs-state-map (kbd "M-E") #'treemacs-previous-line-other-window)
    (define-key evil-treemacs-state-map (kbd "M")   #'treemacs-collapse-parent-node)
    (evil-define-key 'treemacs treemacs-mode-map (kbd "m") #'treemacs-COLLAPSE-action)
    (evil-define-key 'treemacs treemacs-mode-map (kbd "i") #'treemacs-RET-action)
   )
#+end_src

** LSP
*** Configure lsp-mode
#+begin_src emacs-lisp
(use-package lsp-mode
  :defer 0
  :init
  (setq )
  :config
  (lsp-mode 1))
#+end_src

*** Configure lsp-treemacs
#+begin_src emacs-lisp
(use-package lsp-treemacs
  :defer 0
  :config
  (lsp-treemacs-sync-mode 1))
#+end_src

*** Configure lsp-ui
#+begin_src emacs-lisp
(use-package lsp-ui
  :defer 0
  :init
  (setq lsp-ui-doc-show-with-cursor t)
  :config
  (lsp-ui-peek-enable 1)
  (lsp-ui-doc-enable 1))
#+end_src

*** Language specific LSP packages
#+begin_src emacs-lisp
(use-package lsp-haskell)
#+end_src

*** Configure flycheck
#+begin_src emacs-lisp
(use-package flycheck)
#+end_src

*** Configure dap-mode
#+begin_src emacs-lisp
(use-package dap-mode)
#+end_src

** Company
*** Configure company
For autocomplete
#+begin_src emacs-lisp
(use-package company
  :defer 0
  :after lsp-mode
  :config
  (add-to-list 'company-backends 'company-dabbrev)
  (setq company-backends (cons 'company-files (remove 'company-files company-backends)))
  (company-mode 1)
  (define-key company-active-map (kbd "C-n") 'company-select-next)
  (define-key company-active-map (kbd "C-e") 'company-select-previous)
  (define-key company-search-map (kbd "C-n") 'company-select-next)
  (define-key company-search-map (kbd "C-e") 'company-select-previous))
#+end_src

*** Configure company-quickhelp
#+begin_src emacs-lisp
(use-package company-quickhelp
  :hook (company-mode . company-quickhelp-mode))
#+end_src

** Treesitter
#+begin_src emacs-lisp
(use-package tree-sitter-langs)
(use-package tree-sitter
  :after tree-sitter-langs
  :config
  (global-tree-sitter-mode)
  :init 
  (add-to-list 'tree-sitter-major-mode-language-alist '(fundamental-mode . bash))
  (add-hook 'tree-sitter-after-on-hook #'tree-sitter-hl-mode))
#+end_src

** Lang support
#+begin_src emacs-lisp
(use-package haskell-mode)

(use-package rustic)

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

(use-package hcl-mode
  :mod 
  "\\.hcl\\'"
  "\\.nomad\\'")
#+end_src

** Magit
#+begin_src emacs-lisp
(use-package magit)
#+end_src

* VTerm
** Configure vterm
#+begin_src emacs-lisp
(use-package vterm
  :config
  (setq vterm-timer-delay 0.005))

(use-package vterm-toggle 
  :config
  (setq vterm-toggle-fullscreen-p nil)
  (add-to-list 'display-buffer-alist
	      '((lambda(bufname _) (with-current-buffer bufname (equal major-mode 'vterm-mode)))
		(display-buffer-reuse-window display-buffer-at-bottom)
		(reusable-frames . visible)
		(window-height . 0.4))))
#+end_src

** Centaur Tabs
#+begin_src emacs-lisp
(use-package centaur-tabs
  :config
  (setq centaur-tabs-style "box"
;        centaur-tabs-set-bar 'left
	centaur-tabs-height 18
	centaur-tabs-set-modified-marker t
	centaur-tabs-set-icons t)
  (centaur-tabs-group-buffer-groups)
  (add-hook 'server-after-make-frame-hook 'centaur-tabs-mode)
  (centaur-tabs-headline-match)
  (set-face-attribute 'tab-line nil :inherit 'centaur-tabs-unselected))
#+end_src

** Misc packages
#+begin_src emacs-lisp 
(use-package elcord
  :defer 0)

(use-package projectile)

(use-package rainbow-delimiters
  :hook (prog-mode . rainbow-delimiters-mode))

(use-package flex-autopair
  :config
  (flex-autopair-mode 1))

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

(use-package treemacs-all-the-icons)

(use-package general)
#+end_src

* Org
** Add org-mode
#+begin_src emacs-lisp
(use-package org
  :after evil
  :config
  (define-key org-mode-map (kbd "RET") 'org-return-and-maybe-indent)
  (setq evil-want-C-i-jump nil)
  (evil-define-key 'normal org-mode-map (kbd "TAB") 'org-cycle))
#+end_src

** Add org-bullets
#+begin_src emacs-lisp
 (use-package org-bullets
    :config
    (add-hook 'org-mode-hook (lambda () (org-bullets-mode 1))))
#+end_src

** Babel and exports
#+begin_src emacs-lisp
(use-package htmlize)
(add-to-list 'org-latex-packages-alist '("" "minted"))
(setq org-latex-listings 'minted) 

(setq org-latex-pdf-process
      '("pdflatex -shell-escape -interaction nonstopmode -output-directory %o %f"
        "pdflatex -shell-escape -interaction nonstopmode -output-directory %o %f"
        "pdflatex -shell-escape -interaction nonstopmode -output-directory %o %f"))

(setq org-src-fontify-natively t)

(org-babel-do-load-languages
 'org-babel-load-languages
 '((awk . t)
   (python . t)
   (C . t)
   (shell . t)
   (sql . t)
   (latex . t)))
#+end_src

* Mode specific hooks
#+begin_src emacs-lisp
(add-hook 'c-mode-hook 'lsp)
(add-hook 'c++-mode-hook 'lsp)
(add-hook 'haskell-mode-hook #'lsp)
(add-hook 'haskell-literate-mode-hook #'lsp)
#+end_src

* Custom mode line
#+begin_src emacs-lisp
(defface mode-line-buf-name
  `((t :foreground ,c-fg
       :background ,c-bg
       :weight bold
     ))
  "Custom face for buffer name"
  :group 'mode-line-faces )
(defface mode-line-maj-mode
  `((t :foreground ,c-fg
       :background ,c-bg
     ))
  "Custom face for major mode"
  :group 'mode-line-faces )

(defface mode-line-vc
  `((t :foreground ,c-fg
       :background ,c-red-2
       :weight bold
     ))
  "Custom face for VC"
  :group 'mode-line-faces )
(defface mode-line-info
  `((t :foreground ,c-bg
       :background ,c-cyan
       :weight bold
     ))
  "For showing line and column number"
  :group 'mode-line-faces )


(setq-default mode-line-format
              '((:propertize " %b " face mode-line-buf-name)
                (vc-mode (:propertize (" " vc-mode " " ) face mode-line-vc))
                (:propertize (" " mode-name " ") face mode-line-maj-mode)
                (:propertize (" [[ %l | %c || %p . %+%@ ]] ") face mode-line-info)))

(setq exclude-ln '(term-mode-hook eshell-mode-hook shell-mode-hook))
(while exclude-ln
       (add-hook (car exclude-ln) (lambda () (display-line-numbers-mode 0)))
       (setq exclude-ln (cdr exclude-ln)))
(let ((default-color (cons (face-background 'mode-line)
                           (face-foreground 'mode-line))))
  (add-hook 'post-command-hook
       (lambda ()
         (let ((color (cond ((minibufferp) default-color)
                            ((evil-insert-state-p) (cons c-magenta c-fg))
                            ((evil-visual-state-p) (cons c-cyan    c-fg))
                            ((evil-normal-state-p) (cons c-fg      c-bg))
                            ((buffer-modified-p)   (cons c-blue    c-fg))
                            (t default-color))))
	   (set-face-background 'mode-line-buf-name (car color))
	   (set-face-foreground 'mode-line-buf-name (cdr color))
	   ))))
#+end_src

* Pop-up terminal
Stolen from [[https://www.reddit.com/r/emacs/comments/ft84xy/run_shell_command_in_new_vterm/][this]] reddit post
#+begin_src emacs-lisp
(defun run-in-vterm-kill (process event)
  "A process sentinel. Kills PROCESS's buffer if it is live."
  (let ((b (process-buffer process)))
    (and (buffer-live-p b)
         (kill-buffer b))))

(defun run-in-vterm (command)
  (interactive
   (list
    (let* ((f (cond (buffer-file-name)
                    ((eq major-mode 'dired-mode)
                     (dired-get-filename nil t))))
           (filename (concat " " (shell-quote-argument (and f (file-relative-name f))))))
      (read-shell-command "Terminal command: "
                          (cons filename 0)
                          (cons 'shell-command-history 1)
                          (list filename)))))
  (with-current-buffer (vterm-toggle)
    (set-process-sentinel vterm--process #'run-in-vterm-kill)
    (vterm-send-string (concat command))
    (vterm-send-return)))
#+end_src

This returns the command to run in the terminal
#+begin_src emacs-lisp
(defun candrun ()
  (let ((full buffer-file-name)
        (file (file-name-sans-extension buffer-file-name)))
    (pcase (file-name-extension full)
           ("c" (concat "gcc " full "-lm -pthread -o " file " && " file " && rm " file))
           ("java" (concat "java" full))
           ("py" (concat "python" full))
           ("cpp" (concat "g++ " full " -o " file " && " file " && rm " file))
           ("hs" (concat "ghc -dynamic" full " && " file " && rm " file " " file ".o"))
           ("sh" (concat "sh" full))
           ("js" (concat "node" full))
           ("ts" (concat "tsc" full " && node " file ".js && rm " file ".js" ))
           ("rs" (concat "rustc" full " -o " file " && " file " && rm " file)))))
#+end_src

* Keybinds
** General
#+begin_src emacs-lisp
(with-eval-after-load 'general
(general-define-key
  :states '(normal emacs visual motion treemacs Eshell override)
  "M-o" 'treemacs
  "M-v" 'split-window-vertically
  "M-h" 'split-window-horizontally
  "M-C-m" 'shrink-window-horizontally
  "M-C-i" 'enlarge-window-horizontally
  "M-C-e" 'shrink-window
  "M-C-n" 'enlarge-window
  "C-m" 'windmove-left
  "C-i" 'windmove-right
  "C-n" 'windmove-down
  "C-e" 'windmove-up
  "M-,"  'centaur-tabs-backward
  "M-."  'centaur-tabs-forward
  "C-q"  'delete-window
  "M-C-S-q"  'kill-buffer-and-window
  "M-w"  'centaur-tabs--kill-this-buffer-dont-ask
  "M-S-w"  'kill-window)
#+end_src

Pop-up terminal specific keybinds
#+begin_src emacs-lisp

(with-eval-after-load 'vterm-toggle
  (general-define-key
    :states '(override insert normal visual treemacs motion)
    "M-f" 'lsp-format-buffer
    "<f4>"  (lambda () (interactive) (vterm t))
    "C-<f1>" 'vterm-toggle-cd
    "<f1>" 'vterm-toggle
    "<f5>" (lambda () (interactive) (run-in-vterm (candrun))))

    (define-key vterm-mode-map (kbd "<f2>") 'vterm-toggle-forward)
    (define-key vterm-mode-map (kbd "<f3>") 'vterm-toggle-backward)

  (general-define-key
    :states '(normal insert)
    :keymaps 'VTerm
    "C-S-v" 'vterm-yank
    )
)
#+end_src

Toggle Appearance
#+begin_src emacs-lisp
(defun toggle-theme-shade ()
  (if (symbol-value dark-theme)
	    (progn (disable-theme 'doom-solarized-dark)
	           (load-theme 'doom-solarized-light t))
	  (progn (disable-theme 'doom-solarized-light)
	         (load-theme 'doom-solarized-dark t)))
  (setq-local dark-theme (not dark-theme))
  (centaur-tabs-display-update)
  (centaur-tabs-headline-match)
  )

(general-define-key
 :states '(normal)
 "<f7>" (lambda () (interactive) (toggle-theme-shade)))
)
#+end_src