#+title:  General Programming Configuration
#+author: Howard X. Abrams
#+date:   2020-10-26
#+tags: emacs programming yaml ansible docker json

A literate programming file for helping me program.

#+begin_src emacs-lisp :exports none
  ;;; general-programming --- Configuration for general languages. -*- lexical-binding: t; -*-
  ;;
  ;; © 2020-2023 Howard X. Abrams
  ;;   Licensed under a Creative Commons Attribution 4.0 International License.
  ;;   See http://creativecommons.org/licenses/by/4.0/
  ;;
  ;; Author: Howard X. Abrams <http://gitlab.com/howardabrams>
  ;; Maintainer: Howard X. Abrams
  ;; Created: October 26, 2020
  ;;
  ;; This file is not part of GNU Emacs.
  ;;
  ;; *NB:* Do not edit this file. Instead, edit the original literate file at:
  ;;            ~/src/hamacs/ha-programming.org
  ;;       And tangle the file to recreate this one.
  ;;
  ;;; Code:
#+end_src
* Introduction
Configuration for programming interfaces and workflows that behave similarly.
* General
The following work for all programming languages.
** Virtual Environments with Mise
The [[https://github.com/eki3z/mise.el][mise.el]] project overcomes the [[https://mise.jdx.dev/ide-integration.html#emacs][need for shims]] and other hoops when working with [[https://mise.jdx.dev/walkthrough.html][Mise]].

#+BEGIN_SRC emacs-lisp
  (use-package mise
    :straight (:type git :host github :repo "eki3z/mise.el")
    :hook (after-init . global-mise-mode))
#+END_SRC

Now, per project, create a =mise.toml= that contains tools, environment variables, etc.

#+BEGIN_SRC toml
[env]
AWS_DEFAULT_REGION = "us-gov-east-1"

[tools]
python = {version='3', virtualenv='~/.venv/govcloud_lambda'}
#+END_SRC

Or create the entries by using CLI commands:

#+BEGIN_SRC sh :tangle no
mise set AWS_DEFAULT_REGION=us-gov-east-1
#+END_SRC


** Virtual Environments with direnv
Farm off commands into /virtual environments/:
#+begin_src emacs-lisp
  (use-package direnv
    :init
    (setq direnv-always-show-summary t
          direnv-show-paths-in-summary t)
    (if (file-exists-p "/opt/homebrew")
        (setq direnv--executable "/opt/homebrew/bin/direnv")
      (setq direnv--executable "/usr/local/bin/direnv"))
    :config
    (direnv-mode))
#+end_src
** Displaying Code
*** Displaying Line Numbers
For all programming languages, I would like to now default to absolute line numbers, and turn off the [[file:ha-display.org::*Mixed Pitch][Mixed Pitch]] feature that seems to /come along/ for the ride:

#+begin_src emacs-lisp
  (use-package emacs
    :config
    (defun ha-prog-mode-config ()
      "Configure the `prog-mode'"
      (setq display-line-numbers t))
    :hook
    (prog-mode . ha-prog-mode-config))
#+end_src
*** Code Folding
While Emacs has options for viewing and moving around code, sometimes, we could /collapse/ all functions, and then start to expand them one at a time. For this, we could enable the built-in [[https://www.emacswiki.org/emacs/HideShow][hide-show feature]]:
#+begin_src emacs-lisp :tangle no
  (use-package hide-show
    :straight (:type built-in)
    :init
    (setq hs-hide-comments t
          hs-hide-initial-comment-block t
          hs-isearch-open t)
    :hook (prog-mode . hs-minor-mode))
#+end_src
Note that =hide-show= doesn’t work with complex YAML files. The [[https://github.com/gregsexton/origami.el][origami]] mode works better /out-of-the-box/, as it works with Python and Lisp, but falls back to indents as the format, which works well.
#+begin_src emacs-lisp
  (use-package origami
    :init
    (setq origami-fold-replacement "⤵")
    :hook (prog-mode . origami-mode))
#+end_src
To take advantage of this, type:
  - ~z m~ :: To collapse everything
  - ~z r~ :: To open everything
  - ~z o~ :: To open a particular section
  - ~z c~ :: To collapse a /section/ (like a function)
  - ~z a~ :: Toggles open to close

Note: Yes, we could use [[https://github.com/mrkkrp/vimish-fold][vimish-fold]] (and its cousin, [[https://github.com/alexmurray/evil-vimish-fold][evil-vimish-fold]]) and we’ll see if I need those.
*** Smart Parenthesis
We need to make sure we keep the [[https://github.com/Fuco1/smartparens][smartparens]] project always in /strict mode/, because who wants to worry about paren-matching:
#+begin_src emacs-lisp
  (use-package smartparens
    :custom
    (smartparens-global-strict-mode t)

    :config
    (sp-with-modes sp-lisp-modes
      ;; disable ', as it's the quote character:
      (sp-local-pair "'" nil :actions nil))

    (sp-with-modes (-difference sp-lisp-modes sp-clojure-modes)
      ;; use the pseudo-quote inside strings where it serve as hyperlink.
      (sp-local-pair "`" "'"
                     :when '(sp-in-string-p
                             sp-in-comment-p)
                     :skip-match (lambda (ms _mb _me)
                                   (cond
                                    ((equal ms "'") (not (sp-point-in-string-or-comment)))
                                    (t (not (sp-point-in-string-or-comment)))))))
    :hook
    (prog-mode . smartparens-strict-mode))
#+end_src
** Symbol Highlighting
I appreciate calling =hi-lock-face-symbol-at-point= (or =highlight-symbol-at-point=) to highlight all instances of a variable or other symbol.

#+begin_src emacs-lisp
  (use-package auto-highlight-symbol
    :config
    (setq ahs-idle-interval 0.1)

    (set-face-attribute ahs-face nil :foreground 'unspecified :background 'unspecified
                        :weight 'ultra-bold :slant 'italic)
    (set-face-attribute ahs-plugin-default-face nil :foreground 'unspecified
                        :background 'unspecified :weight 'bold :slant 'normal))
#+end_src

Instead of calling =global-auto-highlight-symbol-mode=, we should just hook it to the =prog-mode=:

#+begin_src emacs-lisp
  (use-package auto-highlight-symbol
    :hook ((prog-mode . auto-highlight-symbol-mode)))
#+end_src

Similarly, the [[https://github.com/wolray/symbol-overlay][symbol-overlay]] project highlights instances of symbols, but like =iedit= creates a keymap allowing manipulation of the symbols. The workflow is:

  1. ~SPC t s s~ to highlight the symbol at point.
  2. ~n~ and ~p~ to move from symbol to symbol.
  3. Quitting the menu involves one of these:
       - ~q~ to leave point at spot
       - ~e~ to return to previous cursor placement
       - ~x~ to un-highlight all symbols
  4. ~SPC t s s~ to highlight another symbol at point.
  5. ~N~ and ~P~ to move to a /different symbol/.
  6. ~r~ to rename symbol (like =iedit=)

#+begin_src emacs-lisp
  (use-package symbol-overlay
    :config
    (pretty-hydra-define symbol-overlay (:color pink :quit-key "q")
      ("Show"
       (("s" symbol-overlay-put "highlight")
        ("t" symbol-overlay-toggle-in-scope "in scope"))
       "Navigate"
       (("n" symbol-overlay-jump-next "next")      ; j?
        ("p" symbol-overlay-jump-prev "previous")  ; k?
        ("<" symbol-overlay-jump-first "first")
        (">" symbol-overlay-jump-last "last"))
       "Switch"
       (("N" symbol-overlay-switch-forward "next")
        ("P" symbol-overlay-switch-backward "previous")

        ("d" symbol-overlay-jump-to-definition "definition"))
       "Edit"
       (("r" symbol-overlay-rename "replace" :color blue)
        ("R" symbol-overlay-query-replace "query replace" :color blue))
       "Misc"
       (("w" symbol-overlay-save-symbol "to clipboard")   ; y?
        ("C-s" symbol-overlay-isearch-literally "search all" :color blue))
       "Exit"
       (("e" symbol-overlay-echo-mark "return" :color blue)
        ("x" symbol-overlay-remove-all "hide all" :color blue)
        ("q" nil "leave" :color blue))))

    (ha-leader "t s" '("symbols" . symbol-overlay/body)))
#+end_src

While I created a Hydra for the commands,
this project includes a keymap available only when the cursor (point) is on a highlighted symbol. These keybindings include:

    - ~n~ :: next matching symbol
    - ~p~ :: previous matching symbol
    - <  :: jump first
    - > :: jump last
    - ~d~ :: jump to definition
    - ~e~ :: return to original point position
    - ~h~ :: help
    - ~i~ :: unhighlight symbol
    - ~q~ :: query replace
    - ~r~ :: rename
    - ~s~ :: isearch
    - ~t~ :: toggle in scope
    - ~w~ :: save symbol to clipboard

After reading [[https://lmno.lol/alvaro/its-all-up-for-grabs-and-it-compounds][this essay]] by Álvaro Ramírez, I’ve been thinking of ways to connect services together. In my case, I am not sure I need [[https://github.com/magnars/multiple-cursors.el][multiple cursors]] (as symbol-overlay can rename the symbol which would be 90% of my use case), but I would like to highlight a symbol without actually moving to it.

#+begin_src emacs-lisp
  (use-package symbol-overlay
    :after avy
    :config
    (defun avy-action-highlight-symbol (pt foobar)
      "Highlight symbol starting at PT at the current point."
      (save-excursion
        (avy-action-goto pt foobar)
        (symbol-overlay-put))
      t)

    (add-to-list 'avy-dispatch-alist '(?S . avy-action-highlight-symbol)))
#+end_src
** Spell Checking Comments
The [[https://www.emacswiki.org/emacs/FlySpell#h5o-2][flyspell-prog-mode]] checks for misspellings in comments.

#+begin_src emacs-lisp
  (use-package flyspell
    :hook (prog-mode . flyspell-prog-mode))
#+end_src
** Linting with Flycheck
Why use [[https://www.flycheck.org/][flycheck]] over the built-in =flymake=? Speed used to be the advantage, but I’m now pushing much of this to LSP, so speed is less of an issue.  What about when I am not using LSP? Also, since I’ve hooked grammar checkers, I need this with global keybindings.

#+begin_src emacs-lisp
  (use-package flycheck
    :straight (:host github :repo "flycheck/flycheck")
    :init
    (setq next-error-message-highlight t)
    :bind (:map flycheck-error-list-mode-map
                ("C-n" . 'flycheck-error-list-next-error)
                ("C-p" . 'flycheck-error-list-previous-error)
                ("j"   . 'flycheck-error-list-next-error)
                ("k"   . 'flycheck-error-list-previous-error))
    :config
    (defun flycheck-enable-checker ()
      "Not sure why flycheck disables working checkers."
      (interactive)
      (let (( current-prefix-arg '(4))) ; C-u
        (call-interactively 'flycheck-disable-checker)))

    (flymake-mode -1)
    (global-flycheck-mode)
    (ha-leader "t c" 'flycheck-mode)

    (ha-leader
      ">" '("next problem" . flycheck-next-error)
      "<" '("previous problem" . flycheck-previous-error)

      "e" '(:ignore t :which-key "errors")
      "e n" '(flycheck-next-error     :repeat t :wk "next")
      "e N" '(flycheck-next-error     :repeat t :wk "next")
      "e p" '(flycheck-previous-error :repeat t :wk "previous")
      "e P" '(flycheck-previous-error :repeat t :wk "previous")

      "e b" '("error buffer"     . flycheck-buffer)
      "e c" '("clear"            . flycheck-clear)
      "e l" '("list all"         . flycheck-list-errors)
      "e g" '("goto error"       . counsel-flycheck)
      "e y" '("copy errors"      . flycheck-copy-errors-as-kill)
      "e s" '("select checker"   . flycheck-select-checker)
      "e ?" '("describe checker" . flycheck-describe-checker)
      "e h" '("display error"    . flycheck-display-error-at-point)
      "e e" '("explain error"    . flycheck-explain-error-at-point)
      "e H" '("help"             . flycheck-info)
      "e i" '("manual"           . flycheck-manual)
      "e V" '("verify-setup"     . flycheck-verify-setup)
      "e v" '("version"          . flycheck-verify-checker)
      "e E" '("enable checker"   . flycheck-enable-checker)
      "e x" '("disable checker"  . flycheck-disable-checker)
      "e t" '("toggle flycheck"  . flycheck-mode)))
#+end_src
** Language Documentation
Used to use the Dash project for searching documentation associated with a programming language, but that hardly worked on my Linux systems.

I’m interested in using [[https://devdocs.io/][devdocs.io]] instead, which is similar, but displays it in simple HTML. This can keep it all /inside/ Emacs. Two Emacs projects compete for this position. The Emacs [[https://github.com/astoff/devdocs.el][devdocs]] project is active, and seems to work well. Its advantage is a special mode for moving around the documentation.

#+begin_src emacs-lisp
  (use-package devdocs
    :general (:states 'normal
                      "gD" '("devdocs" . ha-devdocs-major-mode))
    :config
    (pretty-hydra-define hydra-devdocs (:color blue)
      ("Dev Docs"
       (("d" ha-devdocs-major-mode "open")
        ("p" devdocs-peruse "peruse"))
       "Packages"
       (("i" devdocs-install "install")
        ("u" devdocs-update-all "update")
        ("x" devdocs-delete "uninstall")))))
#+end_src

The =devdocs-lookup= command attempts to guess which documentation it should display based on the mode, but if I’m editing YAML files, I actually want to pull up the Ansible documentation, and probably the Jinja ones too.

#+begin_src emacs-lisp :tangle no
  (defun ha-devdocs-major-mode ()
    "My mapping of major mode to Devdocs slug."
    (interactive)
    (let ((devdocs-current-docs
           (cl-case major-mode
             ('emacs-lisp-mode '("elisp"))
             ('python-mode     '("python~.3.11"))
             ('yaml-ts-mode    '("ansible" "jinja-2.11")))))
      (devdocs-lookup nil)))
#+end_src

** Navigation
*** Move by Functions
The =mark-paragraph= and =downcase-word= isn’t very useful in a programming context, and makes more sense to use them to jump around function-by-function:
#+begin_src emacs-lisp
  ; (global-set-key (kbd "M-k") 'beginning-of-defun)
  ; (global-set-key (kbd "M-j") 'beginning-of-next-defun)

  (when (fboundp 'evil-define-key)
    (evil-define-key '(normal insert emacs) prog-mode-map
      (kbd "M-k")    'beginning-of-defun
      (kbd "M-j")    'beginning-of-next-defun))
#+end_src
But one of those functions doesn’t exist:
#+begin_src emacs-lisp
  (defun beginning-of-next-defun (count)
    "Move to the beginning of the following function."
    (interactive "P")
    (end-of-defun count)
    (end-of-defun)
    (beginning-of-defun))
#+end_src
*** Tree Sitter
I’m curious about the new [[https://emacs-tree-sitter.github.io/][Tree Sitter feature]] now [[https://lists.gnu.org/archive/html/emacs-devel/2022-11/msg01443.html][built into Emacs 29]]. After following along with Mickey Petersen’s [[https://www.masteringemacs.org/article/how-to-get-started-tree-sitter][Getting Started with Tree Sitter]] guide, I’ve concluded I /currently/ don’t need this feature. I’m leaving the code here, but adding a =:tangle no= to all the blocks until I’m ready to re-investigate.
**** Operating System Part
Install the binary for the [[https://tree-sitter.github.io/][tree-sitter project]]. For instance:
#+begin_src sh
  brew install tree-sitter npm # Since most support packages need that too.
#+end_src

The tree-sitter project does not install any language grammars by default—after all, it would have no idea which particular languages to parse and analyze!

Next, using the =tree-sitter= command line tool, create the [[/Users/howard.abrams/Library/Application Support/tree-sitter/config.json][config.json]] file:
#+begin_src sh
  tree-sitter init-config
#+end_src

Normally, you would need to  add all the projects to directory clones in =~/src=, e.g.
#+begin_src sh :dir ~/src
  while read REPO
  do
    LOCATION=~/src/$(basename ${REPO})
    if [ ! -d ${LOCATION} ]
    then
      git clone ${REPO} ${LOCATION}
    fi
    cd ${LOCATION}
    git pull origin
    npm install
  done <<EOL
  https://github.com/tree-sitter/tree-sitter-go
  https://github.com/tree-sitter/tree-sitter-javascript
  https://github.com/tree-sitter/tree-sitter-templ
  https://github.com/tree-sitter-grammars/tree-sitter-yaml
  https://github.com/tree-sitter/tree-sitter-json
  https://github.com/tree-sitter/tree-sitter-css
  https://github.com/tree-sitter/tree-sitter-python
  https://github.com/tree-sitter/tree-sitter-bash
  https://github.com/tree-sitter/tree-sitter-ruby
  https://github.com/camdencheek/tree-sitter-dockerfile
  https://github.com/alemuller/tree-sitter-make
  https://github.com/Wilfred/tree-sitter-elisp
  EOL
#+end_src

Seems that Docker is a bit of an odd-ball:
#+begin_src sh
  mkdir -p ~/src
  git -C ~/src clone https://github.com/camdencheek/tree-sitter-dockerfile
  make -C ~/src/tree-sitter-dockerfile && \
  make -C ~/src/tree-sitter-dockerfile install
  if [[ $(uname -n) = "Darwin" ]]
  then
    cp ~/src/tree-sitter-dockerfile/libtree-sitter-dockerfile.dylib \
       ~/.emacs.d/tree-sitter
  else
    cp ~/src/tree-sitter-dockerfile/libtree-sitter-dockerfile.so \
       ~/.emacs.d/tree-sitter
  fi
#+end_src

In most cases,the =npm install= /usually/ works, but I may work on some sort of various process, for instance:
#+begin_src shell
  for TSS in ~/src/tree-sitter-*
  do
    cd $TSS
    NAME=$(pwd | sed 's/.*-//')

    git pull origin
    npm install || make install   # Various build processes!?

    echo "Do we need to copy the library into ~/.emacs.d/tree-sitter/$NAME ?"
    if [[ -e libtree-sitter-$NAME.dylib ]]
    then
      cp libtree-sitter-$NAME.dylib ~/.emacs.d/tree-sitter
    fi

    if [[ -e libtree-sitter-$NAME.so ]]
    then
      cp libtree-sitter-$NAME.so ~/.emacs.d/tree-sitter
    fi
  done
#+end_src
At this point, we can now parse stuff using: =tree-sitter parse <source-code-file>=
**** Emacs Part
Note that Emacs already has the ability to download and install grammars, so following instructions from Mickey Petersen’s essay on [[https://www.masteringemacs.org/article/combobulate-structured-movement-editing-treesitter][using Tree-sitter with Combobulate]]:
#+begin_src emacs-lisp
  (when (treesit-available-p)
    (use-package treesit
      :straight (:type built-in)
      :preface
      (setq treesit-language-source-alist
            '((bash       "https://github.com/tree-sitter/tree-sitter-bash")
              ;; (c          "https://github.com/tree-sitter/tree-sitter-c/" "master" "src")
              (clojure    "https://github.com/sogaiu/tree-sitter-clojure" "master" "src")
              ;; (cpp        "https://github.com/tree-sitter/tree-sitter-cpp/" "master" "src")
              ;; (cmake      "https://github.com/uyha/tree-sitter-cmake")
              (css        "https://github.com/tree-sitter/tree-sitter-css")
              (dockerfile "https://github.com/camdencheek/tree-sitter-dockerfile" "main" "src")
              ;; From my private cloned repository:
              ;; (dockerfile "file:///opt/src/github/tree-sitter-dockerfile" "main" "src")
              ;; The Emacs Lisp Tree Sitter doesn't work with Emacs (go figure):
              ;; (elisp      "https://github.com/Wilfred/tree-sitter-elisp")
              ;; (elixir     "https://github.com/elixir-lang/tree-sitter-elixir" "main" "src")
              ;; (erlang     "https://github.com/WhatsApp/tree-sitter-erlang" "main" "src")
              (go         "https://github.com/tree-sitter/tree-sitter-go")
              (templ      "https://github.com/vrischmann/tree-sitter-templ")
              ;; (haskell    "https://github.com/tree-sitter/tree-sitter-haskell" "master" "src")
              (html       "https://github.com/tree-sitter/tree-sitter-html")
              ;; (java       "https://github.com/tree-sitter/tree-sitter-java" "master" "src")
              ;; (javascript "https://github.com/tree-sitter/tree-sitter-javascript" "master" "src")
              (json       "https://github.com/tree-sitter/tree-sitter-json")
              ;; (julia      "https://github.com/tree-sitter/tree-sitter-julia" "master" "src")
              ;; (lua        "https://github.com/MunifTanjim/tree-sitter-lua" "main" "src")
              (make       "https://github.com/alemuller/tree-sitter-make")
              (markdown   "https://github.com/ikatyang/tree-sitter-markdown")
              ;; (meson      "https://github.com/Decodetalkers/tree-sitter-meson" "master" "src")
              (python     "https://github.com/tree-sitter/tree-sitter-python")
              (ruby       "https://github.com/tree-sitter/tree-sitter-ruby" "master" "src")
              (rust       "https://github.com/tree-sitter/tree-sitter-rust" "master" "src")
              (toml       "https://github.com/tree-sitter/tree-sitter-toml")
              ;; (tsx        "https://github.com/tree-sitter/tree-sitter-typescript" "master" "tsx/src")
              ;; (typescript "https://github.com/tree-sitter/tree-sitter-typescript" "master" "typescript/src")
              (yaml       "https://github.com/tree-sitter-grammars/tree-sitter-yaml")))

      (defun mp-setup-install-grammars ()
        "Install Tree-sitter grammars if they are absent."
        (interactive)
        (sit-for 30)
        (mapc #'treesit-install-language-grammar (mapcar #'car treesit-language-source-alist)))

        ;; Optional, but Mickey recommends. Tree-sitter enabled major
        ;; modes are distinct from their ordinary counterparts, however,
        ;; the `tree-sitter-mode' can't be enabled if we use this
        ;; feature.
        ;;
        ;; You can remap major modes with `major-mode-remap-alist'. Note
        ;; this does *not* extend to hooks! Make sure you migrate them also
        ;; (dolist (mapping '((bash-mode       . bash-ts-mode)
        ;;                    (sh-mode         . bash-ts-mode)
        ;;                    (css-mode        . css-ts-mode)
        ;;                    (dockerfile-mode . dockerfile-ts-mode)
        ;;                    (json-mode       . json-ts-mode)
        ;;                    (makefile-mode   . makefile-ts-mode)
        ;;                    (python-mode     . python-ts-mode)
        ;;                    (ruby-mode       . ruby-ts-mode)
        ;;                    (yaml-mode       . yaml-ts-mode)))
        ;;   (add-to-list 'major-mode-remap-alist mapping))

        ;; Can we (do we need to) update this list?
        ;;   (add-to-list 'tree-sitter-major-mode-language-alist mapping))

      :config
      (mp-setup-install-grammars)))
#+end_src

And enable the languages:
#+begin_src emacs-lisp :tangle no
  (when (treesit-available-p)
    (use-package tree-sitter-langs
      :after treesit
      :config
      (global-tree-sitter-mode)))
#+end_src
*** Combobulate
I like [[file:ha-programming-elisp.org::*Clever Parenthesis][Clever Parenthesis]], but can we extend that to other languages generally? After reading Mickey Petersen’s essay, [[https://www.masteringemacs.org/article/combobulate-structured-movement-editing-treesitter][Combobulate project]], I decided to try out his [[https://github.com/mickeynp/combobulate][combobulate package]]. Of course, this can only work with the underlying tooling supplied by the [[https://emacs-tree-sitter.github.io/][Tree Sitter]] →
#+begin_src emacs-lisp
  (when (treesit-available-p)
    (use-package combobulate
      :straight (:host github :repo "mickeynp/combobulate")
      :after treesit
      :hook ((yaml-ts-mode   . combobulate-mode)
      ;;     (css-ts-mode    . combobulate-mode)
      ;;     (json-ts-mode   . combobulate-mode)
      ;;     (python-ts-mode . combobulate-mode)
            )
     ))
#+end_src

Now, I can create an /interface/ of keystrokes to jump around like a boss:
#+begin_src emacs-lisp
  (when (treesit-available-p)
    (use-package combobulate
      :general
      (:states 'visual :keymaps 'combobulate-key-map
               "o" '("mark node" . combobulate-mark-node-dwim))              ; Mark symbol since "o" doesn't do anything
      (:states 'normal :keymaps 'combobulate-key-map
               "g J" '("avy jump" . combobulate-avy)
               "[ [" '("prev node" . combobulate-navigate-logical-previous)
               "] ]" '("next node" . combobulate-navigate-logical-next)
               "[ f" '("prev defun" . combobulate-navigate-beginning-of-defun)
               "] f" '("next defun" . combobulate-navigate-end-of-defun)

               "[ m" '("drag back" . combobulate-drag-up)
               "] m" '("drag forward" . combobulate-drag-down)
               "[ r" '("raise" . combobulate-vanish-node)

               "g j" '(:ignore t :which-key "combobulate jump")
               "g j j" '("all" . combobulate-avy-jump)
               "g j s" '("strings" . ha-combobulate-string)
               "g j c" '("comments" . ha-combobulate-comment)
               "g j i" '("conditionals" . ha-combobulate-conditional)
               "g j l" '("loops" . ha-combobulate-loop)
               "g j f" '("functions" . combobulate-avy-jump-defun))

      :pretty-hydra
      ((:color pink :quit-key "q")
       ("Navigation"
        (("j" combobulate-navigate-logical-next "Next")
         ("k" combobulate-navigate-logical-previous "Previous")
         ("h" combobulate-navigate-beginning-of-defun "Defun <")
         ("l" combobulate-navigate-end-of-defun "Defun >")
         ("g" combobulate-avy-jump "Avy Jump"))
        "Push"
        (("U" combobulate-drag-up "Drag back")
         ("D" combobulate-drag-down "Drag forward")
         ("R" combobulate-vanish-node "Drag back"))
        "Jump"
        (("s" ha-combobulate-string "to string" :color blue)
         ("c" ha-combobulate-comment "comments" :color blue)
         ("i" ha-combobulate-conditional "conditionals" :color blue)
         ("l" ha-combobulate-loop "loops" :color blue)
         ("f" combobulate-avy-jump-defun "to defuns" :color blue))))))
#+end_src

Mickey’s interface is the [[help:combobulate][combobulate]] function (or ~C-c o o~), but mine is more /evil/.

I can create a /helper function/ to allow me to jump to various types of—well, /types/:
#+begin_src emacs-lisp
  (when (treesit-available-p)
    (use-package combobulate
      :config
      (defun ha-combobulate-string ()
        "Call `combobulate-avy-jump' searching for strings."
        (interactive)
        (with-navigation-nodes (:nodes '("string"))
          (combobulate-avy-jump))))

    (defun ha-combobulate-comment ()
      "Call `combobulate-avy-jump' searching for comments."
      (interactive)
      (with-navigation-nodes (:nodes '("comment"))
        (combobulate-avy-jump)))

    (defun ha-combobulate-conditional ()
      "Call `combobulate-avy-jump' searching for conditionals."
      (interactive)
      (with-navigation-nodes (:nodes '("conditional_expression"
                                       "if_statement"
                                       "if_clause" "else_clause"
                                       "elif_clause"))
        (combobulate-avy-jump)))

    (defun ha-combobulate-loop ()
      "Call `combobulate-avy-jump' searching for loops."
      (interactive)
      (with-navigation-nodes (:nodes '("for_statement" "for_in_clause"
                                       "while_statement" "list_comprehension"
                                       "dictionary_comprehension"
                                       "set_comprehension"))
        (combobulate-avy-jump))))
#+end_src

*** Evil Text Object from Tree Sitter
With Emacs version 29, we get a better approach to parsing languages, and this means that our [[https://github.com/nvim-treesitter/nvim-treesitter-textobjects#built-in-textobjects][text objects]] can be better too with the [[https://github.com/meain/evil-textobj-tree-sitter][evil-textobj-tree-sitter project]]:
#+begin_src emacs-lisp :tangle no
  (when (and (treesit-available-p) (fboundp 'evil-define-text-object))
    (use-package evil-textobj-tree-sitter
      :config
      ;; We need to bind keys to the text objects found at:
      ;; https://github.com/nvim-treesitter/nvim-treesitter-textobjects#built-in-textobjects

      ;; bind `function.outer`(entire function block) to `f` for use in things like `vaf`, `yaf`
      (define-key evil-outer-text-objects-map "f" (evil-textobj-tree-sitter-get-textobj "function.outer"))
      ;; bind `function.inner`(function block without name and args) to `f` for use in things like `vif`, `yif`
      (define-key evil-inner-text-objects-map "f" (evil-textobj-tree-sitter-get-textobj "function.inner"))

      (define-key evil-outer-text-objects-map "c" (evil-textobj-tree-sitter-get-textobj "comment.outer"))
      (define-key evil-inner-text-objects-map "c" (evil-textobj-tree-sitter-get-textobj "comment.inner"))
      (define-key evil-outer-text-objects-map "u" (evil-textobj-tree-sitter-get-textobj "conditional.outer"))
      (define-key evil-inner-text-objects-map "u" (evil-textobj-tree-sitter-get-textobj "conditional.inner"))
      (define-key evil-outer-text-objects-map "b" (evil-textobj-tree-sitter-get-textobj "loop.outer"))
      (define-key evil-inner-text-objects-map "b" (evil-textobj-tree-sitter-get-textobj "loop.inner"))))
#+end_src

Seems the macro, =evil-textobj-tree-sitter-get-textobj= has a bug, so the following—which would have been easier to write—doesn’t work:
#+begin_src emacs-lisp :tangle no :tangle no
  (dolist (combo '(("f" "function.outer" "function.inner")
                   ("b" "loop.outer" "loop.inner")
                   ;; ...
                   ("c" "comment.outer" "comment.inner")))
    (destructuring-bind (key outer inner) combo
      ;; bind an outer (e.g. entire function block) for use in things like `vaf`, `yaf` combo
      (define-key evil-outer-text-objects-map key (evil-textobj-tree-sitter-get-textobj outer))
      ;; bind an inner (e.g. function block without name and args) for use in things like `vif`, `yif`
      (define-key evil-inner-text-objects-map key (evil-textobj-tree-sitter-get-textobj inner))))
#+end_src
*** dumb-jump
Once upon a time, we use to create a =TAGS= file that contained the database for navigating code bases, but with new faster versions of grep, e.g.  [[https://beyondgrep.com][ack]], [[https://github.com/ggreer/the_silver_searcher][ag]] (aka, the Silver Searcher),  [[https://github.com/Genivia/ugrep][ugrep]] and [[https://github.com/BurntSushi/ripgrep][ripgrep]], we should be able to use them.  but I want to:
  - Be in a function, and see its callers. For this, the [[help:rg-dwim][rg-dwim]] function is my bread-and-butter.
  - Be on a function, and jump to the definition. For this, I use [[https://github.com/jacktasia/dumb-jump][dumb-jump]], which uses the above utilities.

#+begin_src emacs-lisp
  (use-package dumb-jump
    :config
    (setq dumb-jump-prefer-searcher 'rg
          xref-history-storage #'xref-window-local-history
          xref-show-definitions-function #'xref-show-definitions-completing-read)

    (add-hook 'xref-backend-functions #'dumb-jump-xref-activate)
    ;; Never using the etags backend. GNU Global? Maybe.
    (remove-hook 'xref-backend-functions #'etags--xref-backend))
#+end_src

While I’m at it, let’s connect various ~g~ sequence keys to =xref-= interface functions:

#+begin_src emacs-lisp
  (use-package emacs
    :general
    (:states 'normal
             "g ." '("find def"       . xref-find-definitions)
             "g >" '("find def o/win" . xref-find-definitions-other-window)
             "g ," '("def go back"    . xref-go-back)
             "g <" '("def go forward" . xref-go-forward)
             "g /" '("find refs"      . xref-find-references)
             "g ?" '("find/rep refs"  . xref-find-references-and-replace)
             "g h" '("find apropos"   . xref-find-apropos)
             "g b" '("def go back"    . xref-go-back)))
#+end_src

I have two different /jumping/ systems, the [[info:emacs#Xref][Xref interface]] and Evil’s. While comparable goals, they are behave different. Let’s compare evil keybindings:
  | ~M-.~   | ~g .~ | [[help:xref-find-definitions][xref-find-definitions]] (also ~g d~ for [[help:evil-goto-definition][evil-goto-definition]])†          |
  |       | ~g >~ | =xref-find-definitions-other-window=                                  |
  | ~M-,~   | ~g ,~ | [[help:xref-go-back][xref-go-back]] (see [[help:xref-pop-marker-stack][xref-pop-marker-stack]])                            |
  | ~C-M-,~ | ~g <~ | [[help:xref-go-forward][xref-go-forward]] (kinda like =xref-find-definitions=)                  |
  | ~M-?~   | ~g /~ | [[help:xref-find-references][xref-find-references]] to go from definition to code calls‡           |
  |       | ~g ?~ | [[help:xref-find-references-and-replace][xref-find-references-and-replace]] could be more accurate than [[*iEdit][iEdit]]. |
  | ~C-M-.~ | ~g h~ | [[help:xref-find-apropos][xref-find-apropos]]  … doesn’t work well without LSP                  |
  | ~C-TAB~ |     | perform completion around point (also ~M-TAB~), see [[file:ha-config.org::*Auto Completion][Auto Completion]].  |

† Prefix to prompt for the term \
‡ If it finds more than one definition, Emacs displays the [[info:emacs#Xref Commands][*xref* buffer]], allowing you to select the definition.
** Language Server Protocol (LSP) Integration
The [[https://microsoft.github.io/language-server-protocol/][LSP]] is a way to connect /editors/ (like Emacs) to /languages/ (like Lisp)… wait, no. While originally designed for VS Code and probably Python, we can abstract away [[https://github.com/davidhalter/jedi][Jedi]] and the [[http://tkf.github.io/emacs-jedi/latest/][Emacs integration to Jedi]] (and duplicate everything for Ruby, and Clojure, and…).

Emacs has two LSP projects, and while I have used [[LSP Mode]], but since I don’t have heavy IDE requirements, I am finding that [[eglot]] to be simpler.

#+begin_src emacs-lisp
  (use-package eglot
    :straight nil
    :commands eglot-ensure
    :config
    (setq eglot-autoshutdown t))
#+end_src

The [[https://github.com/flycheck/flycheck-eglot][flycheck-eglot]] package bridges eglot diagnostics into flycheck, so existing checkers and keybindings continue to work unchanged:
#+begin_src emacs-lisp
  (use-package flycheck-eglot
    :after (flycheck eglot)
    :config
    (global-flycheck-eglot-mode 1))
#+end_src
** General Code Editing
*** iEdit
While there are language-specific ways to rename variables and functions, [[https://github.com/victorhge/iedit][iedit]] is often sufficient.
#+begin_src emacs-lisp :tangle no
  (use-package iedit
    :config
    (ha-leader "s e" '("iedit" . iedit-mode)))
#+end_src

While =iedit= acts a little odd with Evil, the [[https://github.com/syl20bnr/evil-iedit-state][evil-iedit-state project]] attempts to makes the interface more intuitive.

This creates both an =iedit= and =iedit-insert= states. Calling ~Escape~ from =iedit-insert= goes to =iedit=, and hitting it again, will go back to =normal= state.

To use, highlight a region with ~v~, and continue to hit ~v~ until you’ve selected the variable/symbol, and then type ~e~. Or, highlight normally, e.g. ~v i o~, and hit ~E~:
#+begin_src emacs-lisp
  (when (fboundp 'evil-mode)
    (use-package evil-iedit-state
      :after iedit
      :general
      (:states 'visual "E" '("iedit" . evil-iedit-state/iedit-mode))))
#+end_src

 The =iedit-insert= state is pretty much /regular/ =insert= state, so the interesting keys are in =iedit= state:
  - ~0~ / ~$~ :: jump to beginning/end of the “occurrence”
  - ~n~ / ~N~ :: jump to next / previous occurrence
  - ~I~ / ~A~ :: jump to beginning/end of occurrence and go into =iedit-insert= mode (obviously ~a~ and ~i~ do too)
  - ~#~ :: highlights all the matching occurrences
  - ~F~ :: restricts to the current function
*** Case Conversion
The [[https://github.com/akicho8/string-inflection][string-inflection]] project (see [[http://sodaware.sdf.org/notes/converting-to-snake-case-in-emacs/][this overview]]) converts symbol variables to /appropriate format/ for the mode. This replaces my home-brewed functions.
#+begin_src emacs-lisp
  (use-package string-inflection
    :general
    (:states '(normal visual motion operator)
             "z s" '("to snake case" . string-inflection-underscore)
             "z S" '("to Snake Case" . string-inflection-upcase)
             "z c" '("to camelCase" . string-inflection-lower-camelcase)
             "z C" '("to CamelCase" . string-inflection-camelcase)
             "z -" '("to kebab case" . string-inflection-kebab-case)
             "z z" '("toggle snake/camel" . string-inflection-all-cycle)))
#+end_src
I would like to have this bound on the ~g~ sequence, but that is crowded.

Note that ~g u~ (for lower-casing stuff), and  ~g U~ (for up-casing) requires /something/, for instance ~g U i o~ upper-cases the symbol at point. These functions, however, only work with a symbol (which is the typical case).
** Inline Code Evaluation
While I like [[help:eval-print-last-sexp][eval-print-last-sexp]], I would like a bit of formatting in order to /keep the results/ in the file.
#+begin_src emacs-lisp
  (defun ha-eval-print-last-sexp (&optional internal-arg)
    "Evaluate the expression located before the point.
  Insert results back into the buffer at the end of the line after
  a comment."
    (interactive)
    (save-excursion
      (eval-print-last-sexp internal-arg))
    (end-of-line)
    (insert "  ")
    (insert comment-start)
    (insert "⟹ ")
    (dotimes (i 2)
      (next-line)
      (join-line)))
#+end_src

Typical keybindings for all programming modes:
#+begin_src emacs-lisp
  (ha-local-leader :keymaps 'prog-mode-map
     "e"  '(:ignore t :which-key "eval")
     "e ;" '("expression" . eval-expression)
     "e b" '("buffer" . eval-buffer)
     "e f" '("function" . eval-defun)
     "e r" '("region" . eval-region)
     "e e" '("eval exp" . eval-last-sexp)
     "e p" '("print s-exp" . ha-eval-print-last-sexp))
#+end_src
** Ligatures
The idea of using math symbols for a programming languages keywords is /cute/, but can be confusing, so I use it sparingly:
#+begin_src emacs-lisp
  (defun ha-prettify-prog ()
    "Extends the `prettify-symbols-alist' for programming."
    (mapc (lambda (pair) (push pair prettify-symbols-alist))
          '(("lambda" . "𝝀")
            (">=" . "≥")
            ("<=" . "≤")
            ("!=" . "≠")))
    (prettify-symbols-mode))

  (add-hook 'prog-mode-hook 'ha-prettify-prog)
#+end_src

Hopefully I can follow [[https://www.masteringemacs.org/article/unicode-ligatures-color-emoji][Mickey Petersen's essay]] on getting full ligatures working, but right now, they don’t work on the Mac, and that is my current workhorse.
#+begin_src emacs-lisp
  (use-package ligature
    :config
    ;; Enable the "www" ligature in every possible major mode
    (ligature-set-ligatures 't '("www"))

    ;; Enable traditional ligature support in eww-mode, if the
    ;; `variable-pitch' face supports it
    (ligature-set-ligatures '(org-mode eww-mode) '("ff" "fi" "ffi"))

    (ligature-set-ligatures '(html-mode nxml-mode web-mode)
                            '("<!--" "-->" "</>" "</" "/>" "://"))

    ;; Create a new ligature:
    (ligature-set-ligatures 'markdown-mode '(("=" (rx (+ "=") (? (| ">" "<"))))
                                             ("-" (rx (+ "-")))))

    ;; Enable all Cascadia Code ligatures in programming modes
    (ligature-set-ligatures
     'prog-mode '("|||>" "<|||" "<==>" "<!--" "####" "~~>" "***" "||=" "||>"
                  ":::" "::=" "=:=" "===" "==>" "=!=" "=>>" "=<<" "=/=" "!=="
                  "!!." ">=>" ">>=" ">>>" ">>-" ">->" "->>" "-->" "---" "-<<"
                  "<~~" "<~>" "<*>" "<||" "<|>" "<$>" "<==" "<=>" "<=<" "<->"
                  "<--" "<-<" "<<=" "<<-" "<<<" "<+>" "</>" "###" "#_(" "..<"
                  "..." "+++" "/==" "///" "_|_" "www" "&&" "^=" "~~" "~@" "~="
                  "~>" "~-" "**" "*>" "*/" "||" "|}" "|]" "|=" "|>" "|-" "{|"
                  "[|" "]#" "::" ":=" ":>" ":<" "$>" "==" "=>" "!=" "!!" ">:"
                  ">=" ">>" ">-" "-~" "-|" "->" "--" "-<" "<~" "<*" "<|" "<:"
                  "<$" "<=" "<>" "<-" "<<" "<+" "</" "#{" "#[" "#:" "#=" "#!"
                  "##" "#(" "#?" "#_" "%%" ".=" ".-" ".." ".?" "+>" "++" "?:"
                  "?=" "?." "??" ";;" "/*" "/=" "/>" "//" "__" "~~" "(*" "*)"
                  "\\\\" "://"))
    ;; Enables ligature checks globally in all buffers. You can also do it
    ;; per mode with `ligature-mode'.
    (global-ligature-mode t))
#+end_src

Until I can get [[https://github.com/d12frosted/homebrew-emacs-plus/issues/222][Harfbuzz support]] on my Emacs-Plus build of Mac, the following work-around seems to mostly work:
#+begin_src emacs-lisp
  (defun ha-mac-litagure-workaround ()
    "Implement an old work-around for ligature support.
  This kludge seems to only need to be set for my Mac version of
  Emacs, since I can't build it with Harfuzz support."
    (let ((alist '((33 . ".\\(?:\\(?:==\\|!!\\)\\|[!=]\\)")
                   (35 . ".\\(?:###\\|##\\|_(\\|[#(?[_{]\\)")
                   (36 . ".\\(?:>\\)")
                   (37 . ".\\(?:\\(?:%%\\)\\|%\\)")
                   (38 . ".\\(?:\\(?:&&\\)\\|&\\)")
                   (42 . ".\\(?:\\(?:\\*\\*/\\)\\|\\(?:\\*[*/]\\)\\|[*/>]\\)")
                   (43 . ".\\(?:\\(?:\\+\\+\\)\\|[+>]\\)")
                   (45 . ".\\(?:\\(?:-[>-]\\|<<\\|>>\\)\\|[<>}~-]\\)")
                   (46 . ".\\(?:\\(?:\\.[.<]\\)\\|[.=-]\\)")
                   (47 . ".\\(?:\\(?:\\*\\*\\|//\\|==\\)\\|[*/=>]\\)")
                   (48 . ".\\(?:x[a-zA-Z]\\)")
                   (58 . ".\\(?:::\\|[:=]\\)")
                   (59 . ".\\(?:;;\\|;\\)")
                   (60 . ".\\(?:\\(?:!--\\)\\|\\(?:~~\\|->\\|\\$>\\|\\*>\\|\\+>\\|--\\|<[<=-]\\|=[<=>]\\||>\\)\\|[*$+~/<=>|-]\\)")
                   (61 . ".\\(?:\\(?:/=\\|:=\\|<<\\|=[=>]\\|>>\\)\\|[<=>~]\\)")
                   (62 . ".\\(?:\\(?:=>\\|>[=>-]\\)\\|[=>-]\\)")
                   (63 . ".\\(?:\\(\\?\\?\\)\\|[:=?]\\)")
                   (91 . ".\\(?:]\\)")
                   (92 . ".\\(?:\\(?:\\\\\\\\\\)\\|\\\\\\)")
                   (94 . ".\\(?:=\\)")
                   (119 . ".\\(?:ww\\)")
                   (123 . ".\\(?:-\\)")
                   (124 . ".\\(?:\\(?:|[=|]\\)\\|[=>|]\\)")
                   (126 . ".\\(?:~>\\|~~\\|[>=@~-]\\)"))))
      (dolist (char-regexp alist)
        (set-char-table-range composition-function-table (car char-regexp)
                              `([,(cdr char-regexp) 0 font-shape-gstring])))))

  (unless (s-contains? "HARFBUZZ" system-configuration-features)
    (add-hook 'prog-mode-hook #'ha-mac-litagure-workaround))
#+end_src

The unicode-fonts package rejigs the internal tables Emacs uses to pick better fonts for unicode codepoint ranges.
#+begin_src emacs-lisp :tangle no
  (use-package unicode-fonts
    :config
    (ignore-errors
      (unicode-fonts-setup)))
#+end_src
** Compiling
The [[help:compile][compile]] function lets me enter a command to run, or I can search the history for a previous run. What it doesn’t give me, is a project-specific list of commands. Perhaps, for each project, I define in =.dir-locals.el= a variable, =compile-command-list=, like:
#+begin_src emacs-lisp :tangle no
  ((nil . ((compile-command . "make -k ")
           (compile-command-list . ("ansible-playbook playbooks/confluence_test.yml"
                                "ansible-playbook playbooks/refresh_inventory.yml")))))
#+end_src

Many of the build tools now attempt to use ANSI colorization in order to make the output pretty.

#+BEGIN_SRC emacs-lisp
  (require 'ansi-color)

  (defun colorize-compilation-buffer ()
    (let ((inhibit-read-only t))
      (ansi-color-apply-on-region (point-min) (point-max))))

  (add-hook 'compilation-filter-hook 'colorize-compilation-buffer)
#+END_SRC

And let’s see the results by scrolling the buffer.:

#+BEGIN_SRC emacs-lisp
  (setq compilation-scroll-output t)
#+END_SRC

To make the =compile-command-list= variable less risky, we need to declare it:
#+begin_src emacs-lisp
  (defvar compile-command-list nil "A list of potential commands to give to `ha-project-compile'.")

  (defun ha-make-compile-command-list-safe ()
    "Add the current value of `compile-command-list' safe."
    (interactive)
    (add-to-list 'safe-local-variable-values `(compile-command-list . ,compile-command-list)))
#+end_src

What compile commands should I have on offer? Along with the values in =compile-command-list= (if set), I could look at files in the project’s root and get targets from a =Makefile=, etc. We’ll use helper functions I define later:
#+begin_src emacs-lisp
  (defun ha--compile-command-list ()
    "Return list of potential commands for a project."
    (let ((default-directory (project-root (project-current))))
      ;; Make a list of ALL the things.
      ;; Note that `concat' returns an empty string if you give it null,
      ;; so we use `-concat' the dash library:
      (-concat
       compile-history
       (ha--makefile-completions)
       (ha--toxfile-completions)
       (when (and (boundp 'compile-command-list) (listp compile-command-list))
         compile-command-list))))
#+end_src

My replacement to [[help:compile][compile]] uses my new =completing-read= function:
#+begin_src emacs-lisp
  (defun ha-project-compile (command)
    "Run `compile' from a list of directory-specific commands."
    (interactive (list (completing-read "Compile command: "
                                        (ha--compile-command-list)
                                        nil nil "" 'compile-history)))
    (let ((default-directory (project-root (project-current))))
      (cond
       ((string-match rx-compile-to-vterm command)  (ha-compile-vterm command))
       ((string-match rx-compile-to-eshell command) (ha-compile-eshell command))
       (t                                           (compile command)))))
#+end_src

If I end a command with a =|v=, it sends the compile command to a vterm session for the project, allowing me to continue the commands:
#+begin_src emacs-lisp
  (defvar rx-compile-to-vterm  (rx "|" (0+ space) "v" (0+ space) line-end))

  (defun ha-compile-vterm (full-command &optional project-dir)
    (unless project-dir
      (setq project-dir (project-name (project-current))))

    ;; (add-to-list 'compile-history full-command)
    (let ((command (replace-regexp-in-string rx-compile-to-vterm "" full-command)))
      (ha-ssh-send command project-dir)))
#+end_src

And what about sending the command to Eshell as well?
#+begin_src emacs-lisp
  (defvar rx-compile-to-eshell (rx "|" (0+ space) "s" (0+ space) line-end))

  (defun ha-compile-eshell (full-command &optional project-dir)
    "Send a command to the currently running Eshell terminal.
  If a terminal isn't running, it will be started, allowing follow-up
  commands."
    (unless project-dir
      (setq project-dir (project-name (project-current))))

    (let ((command (replace-regexp-in-string rx-compile-to-eshell "" full-command)))
      (ha-eshell-send command project-dir)))
#+end_src
And let’s add it to the Project leader:
#+begin_src emacs-lisp
  (ha-leader "p C" 'ha-project-compile)
#+end_src
Note that =p c= (to call [[help:recompile][recompile]]) should still work.

Other people’s projects:
  - [[https://github.com/Olivia5k/makefile-executor.el][makefile-executor.el]] :: works only with Makefiles
  - [[https://github.com/tarsius/imake][imake]] :: works only with Makefiles that are formatted with a =help:= target
  - [[https://github.com/emacs-taskrunner/emacs-taskrunner][Taskrunner project]] :: requires ivy or helm, but perhaps I could use the underlying infrastructure to good ol’ [[help:completing-read][completing-read]]

Note: Someday I may want to convert my =Makefile= projects to [[https://taskfile.dev/][Taskfile]].
*** Makefile Completion
This magic script is what Bash uses for completion when you type =make= and hit the TAB:
#+name: make-targets
#+begin_src shell :tangle no
make -qRrp : 2> /dev/null | awk -F':' '/^[a-zA-Z0-9][^$#\\/\\t=]*:([^=]|$)/ {split($1,A,/ /);for(i in A)print A[i]}'
#+end_src

Which makes it easy to get a list of completions for my compile function:
#+begin_src emacs-lisp :noweb yes
  (defun ha--makefile-completions ()
    "Returns a list of targets from the Makefile in the current directory."
    (when (file-exists-p "Makefile")
      (--map (format "make -k %s" it)
             (shell-command-to-list "<<make-targets>>"))))
#+end_src
*** Python Tox Completion
Let’s just grab the environments to run:
#+begin_src emacs-lisp
  (defun ha--toxfile-completions ()
    "Returns a list of targets from the tox.ini in the current directory."
    (when (file-exists-p "tox.ini")
      (--map (format "tox -e %s" it)
             (shell-command-to-list "tox -a"))))
#+end_src
* Languages
Simple to configure languages go here. More advanced languages go into their own files… eventually.
** Configuration Files
So many configuration files to track:
#+begin_src emacs-lisp
  (use-package conf-mode
    :mode (("\\.conf\\'"     . conf-space-mode)
           ("\\.repo\\'"     . conf-unix-mode)
           ("\\.setup.*\\'"  . conf-space-mode)))
#+end_src
** JSON
While interested in the [[https://github.com/emacs-tree-sitter/tree-sitter-langs][tree-sitter]] extensions for JSON, e.g. =json-ts-mode=, that comes with Emacs 29, I’ll deal with what is bundled now.

However, what about taking a buffer of JSON data, and whittling it down with [[https://jqlang.github.io/jq/][jq]]?
#+begin_src emacs-lisp
  (defun ha-json-buffer-to-jq (query)
    "Runs JSON buffer with QUERY through an external `jq' program.
  Attempts to find the first JSON object in the buffer, and limits
  the data to that region. The `jq' program is the first found in
  the standard path."
    (interactive "sjq Query: ")
    (let (s e)
      (save-excursion
        (if (region-active-p)
            (setq s (region-beginning)
                  e (region-end))
          (goto-char (point-min))
          (unless (looking-at "{")
            (re-search-forward "{")
            (goto-char (match-beginning 0)))
          (setq s (point))
          ;; Jump forward using the evil-jump-item ... change this to one
          ;; of the functions in thing-at-point?
          (when (fboundp 'evil-jump-item)
            (evil-jump-item))
          (setq e (1+ (point))))
        ;; (narrow-to-region s e)
        (shell-command-on-region s e (concat "jq " query) nil t "*jq errors*"))))

  (ha-local-leader :keymaps '(js-json-mode-map json-ts-mode-map)
    "j" 'ha-json-buffer-to-jq)
#+end_src

This means, that some data like:
#+begin_src json :tangle no
  {
    "common_id": "GMC|F2BADC23|64D52BF7|awardlateengine",
    "data": {
      "name": "Create And Wait for Service Image",
      "description": "Creates a new Service Image using IMaaS",
      "long_description": "This job creates a new service image with name ... blah, blah, blah",
      "job_id": "5e077245-0f4a-4dc9-b473-ce3ec0b811ba",
      "state": "success",
      "progress": "100",
      "timeout": {
        "seconds": 300,
        "strategy": "real_time",
        "elapsed": 1291.8504
      },
      "started_at": "2023-08-10T16:20:49Z",
      "finished_at": "2023-08-10T16:42:20Z",
      "links": [
        {
          "rel": "child-4aa5978c-4537-4aa9-9568-041ad97c2374",
          "href": "https://eng501.garmet.howardism.org/api/jobs/4aa5978c-4537-4aa9-9568-041ad97c2374"
        },
        {
          "rel": "project",
          "href": "https://eng501.garmet.howardism.org/api/projects/8abe0f6e-161e-4423-ab27-d4fb0d5cfd0c"
        },
        {
          "rel": "details",
          "href": "https://eng501.garmet.howardism.org/api/jobs/5e077245-0f4a-4dc9-b473-ce3ec0b811ba/details"
        }
      ],
      "tags": [
        "foobar", "birdie"
      ],
      "progress_comment": null,
      "children": [
        {
          "id": "4aa5978c-4537-4aa9-9568-041ad97c2374"
        }
      ]
    },
    "status": "SUCCESS"
  }
#+end_src

I can type, ~, j~ and then type =.data.timeout.seconds= and end up with:
#+begin_src json
  300
#+end_src
** Markdown
Most project =README= files and other documentation use [[https://jblevins.org/projects/markdown-mode/][markdown-mode]]. Note that the /preview/ is based on =multimarkdown=, when needs to be /pre-installed/, for instance:
#+begin_src sh
  brew install multimarkdown
#+end_src

Also, I like Markdown is look like a word processor, similarly to my org files:
#+begin_src emacs-lisp
  (use-package markdown-mode
    :mode ((rx ".md" string-end) . gfm-mode)
    :init (setq markdown-command (expand-file-name "markdown" "~/bin")
                markdown-open-command (expand-file-name "markdown-open" "~/bin")
                markdown-header-scaling t)
    :general
    (:states 'normal :no-autoload t :keymaps 'markdown-mode-map
             ", l" '("insert link" . markdown-insert-link) ; Also C-c C-l
             ", i" '("insert image" . markdown-insert-image) ; Also C-c C-i
             ;; SPC u 3 , h for a third-level header:
             ", h" '("insert header" . markdown-insert-header-dwim)
             ", t"  '(:ignore t :which-key "toggles")
             ", t t" '("toggle markup" . markdown-toggle-markup-hiding)
             ", t u" '("toggle urls" . markdown-toggle-markup-url-hiding)
             ", t i" '("toggle images" . markdown-toggle-markup-inline-images)
             ", t m" '("toggle math" . markdown-toggle-markup-math-hiding)
             ", d" '("do" . markdown-do)
             ", e" '("export" . markdown-export)
             ", p" '("preview" . markdown-preview)))
#+end_src

Note that the markdown-specific commands use the ~C-c C-c~ and  ~C-c C-s~ prefixes.

Let’s make sure that [[https://www.flycheck.org/en/latest/languages.html#markdown][markdown]] is proper using [[https://pypi.org/project/pymarkdownlnt/][PyMarkdown]]. First, get the script installed globally:

#+begin_src sh
  pip install pymarkdown
#+end_src

And then we can use it. For some reason, the =pymarkdown= (which I need to use from work) doesn’t seem to be part of the version of Flycheck available on Melpa, so…

#+begin_src emacs-lisp
  (use-package markdown-mode
    :after flycheck
    :config
    (setq flycheck-markdown-pymarkdown-config
          (expand-file-name ".pymarkdown.yml" (getenv "HOME")))
    (flycheck-may-enable-checker 'markdown-pymarkdown))
#+end_src

Ugh

#+begin_src emacs-lisp
  (flycheck-def-config-file-var flycheck-markdown-pymarkdown-config
      markdown-pymarkdown nil
    :package-version '(flycheck . "34"))

  (flycheck-define-checker markdown-pymarkdown
    "Markdown checker using PyMarkdown.

  See URL `https://pypi.org/project/pymarkdownlnt/'."
    :command ("pymarkdown"
              (config-file "--config" flycheck-markdown-pymarkdown-config)
              "scan"
              source)
    :error-patterns
    ((error line-start
            (file-name) ":" line
            (? ":" column) ": " (id (one-or-more alnum))
            ": " (message) line-end))
    :error-filter
    (lambda (errors)
      (flycheck-sanitize-errors
       (flycheck-remove-error-file-names "(string)" errors)))
    :modes (markdown-mode gfm-mode))
#+end_src

Both the =markdown-command= and the =markdown-open-command= variables are called to render (and preview) a Markdown file (~C-c C-c o~), and calls the following scripts (which in turn, call =pandoc= as I depend on this for other org-related features):

#+begin_src sh :tangle ~/bin/markdown :shebang "#!/usr/bin/env bash" :tangle-mode u+x
  pandoc --to=html --from=gfm $*
#+end_src

#+begin_src sh :tangle ~/bin/markdown-open :shebang "#!/usr/bin/env bash" :tangle-mode u+x
  OUTPUT_FILE=$(mktemp 'emacs-view-XXXXXXX.html')
  pandoc --to=html --from=gfm --output=$OUTPUT_FILE $*

  # Are we on a MacOS Laptop:
  if [ -d "/Library" ]
  then
    open $OUTPUT_FILE
  else
    firefox -new-tab $OUTPUT_FILE
  fi
#+end_src

Using [[https://polymode.github.io/][polymode]], let’s add syntax coloring to Markdown code blocks similar to what we do with Org:

#+begin_src emacs-lisp
  (use-package polymode
    :config
    (define-hostmode poly-markdown-hostmode :mode 'markdown-mode)
    (define-auto-innermode poly-markdown-fenced-code-innermode
                           :head-matcher (cons "^[ \t]*\\(```{?[[:alpha:]].*\n\\)" 1)
                           :tail-matcher (cons "^[ \t]*\\(```\\)[ \t]*$" 1)
                           :mode-matcher (cons "```[ \t]*{?\\(?:lang *= *\\)?\\([^ \t\n;=,}]+\\)" 1)
                           :head-mode 'host
                           :tail-mode 'host)
    (define-polymode poly-markdown-mode
                     :hostmode 'poly-markdown-hostmode
                     :innermodes '(poly-markdown-fenced-code-innermode))

    :mode ((rx ".md" string-end) . poly-markdown-mode))
#+end_src
** ReStructured Text
Support for [[https://docutils.sourceforge.io/rst.html][reStructuredText]] is [[https://www.emacswiki.org/emacs/reStructuredText][well supported]] in Emacs.
#+begin_src emacs-lisp
  (use-package rst
    :config
    (when (and (display-graphic-p) (boundp 'ha-fixed-font))
      (set-face-attribute 'rst-literal nil :font ha-fixed-font)))
#+end_src
** Docker
Edit =Dockerfiles= with the [[https://github.com/spotify/dockerfile-mode][dockerfile-mode]] project:
#+BEGIN_SRC emacs-lisp
  (use-package dockerfile-mode
    :mode (rx string-start "Dockerfile")
    :config
    (make-local-variable 'docker-image-name)
    (defvaralias 'docker-image-name 'dockerfile-image-name nil)

    (ha-local-leader :keymaps 'dockerfile-mode-map
      "b" '("build" . dockerfile-build-buffer)
      "B" '("build no cache" . dockerfile-build-no-cache-buffer)
      "t" '("insert build tag" . ha-dockerfile-build-insert-header))

    (defun ha-dockerfile-build-insert-header (image-name)
      "Prepends the default Dockerfile image name at the top of a file."
      (interactive "sDefault image name: ")
      (save-excursion
        (goto-char (point-min))
        (insert (format "## -*- dockerfile-image-name: \"%s\" -*-" image-name))
        (newline))))
#+END_SRC

/Control/ Docker from Emacs using the [[https://github.com/Silex/docker.el][docker.el]] project:
#+BEGIN_SRC emacs-lisp
  (use-package docker
    :commands docker
    :config
    (ha-leader "a d" 'docker))
#+END_SRC

Unclear whether I want to Tramp into a running container:
#+BEGIN_SRC emacs-lisp :tangle no
  (use-package docker-tramp
    :defer t
    :after docker)
#+END_SRC

** Shell Scripts
While I don't like writing them, I can't get away from them. Check out the goodies in [[https://www.youtube.com/watch?v=LTC6SP7R1hA&t=5s][this video]].

While filename extensions work fine most of the time, I don't like to pre-pend =.sh= to the shell scripts I write, and instead, would like to associate =shell-mode= with all files in a =bin= directory:
#+begin_src emacs-lisp
  (use-package sh-mode
    :straight (:type built-in)
    :mode (rx (or (seq ".sh" eol)
                  "/bin/"))
    :init
    (setq sh-basic-offset 4
          sh-indentation 4)
    :config
    (ha-auto-insert-file (rx (or (seq ".sh" eol)
                                 "/bin/"))
                         "sh-mode.sh")
    :hook
    (after-save . executable-make-buffer-file-executable-if-script-p))
#+end_src
*Note:* we make the script /executable/ by default. See [[https://emacsredux.com/blog/2021/09/29/make-script-files-executable-automatically/][this essay]] for details, but it turns on the executable bit if the script has a shebang at the top of the file.

The [[https://www.shellcheck.net/][shellcheck]] project integrates with [[Flycheck]]. First, install the executable into the system, for instance, on a Mac:
#+begin_src sh
  brew install shellcheck
#+end_src
And we can enable it:
#+begin_src emacs-lisp
  (flycheck-may-enable-checker 'sh-shellcheck)
#+end_src
Place the following /on a line/ before a shell script warning to ignore it:
#+begin_src sh
# shellcheck disable=SC2116,SC2086
#+end_src
See [[https://github.com/koalaman/shellcheck/wiki/Ignore][this page]] for details.

Integration with the [[https://github.com/bash-lsp/bash-language-server][Bash LSP implementation]]. First, install that too:
#+begin_src sh
  brew install bash-language-server
#+end_src
*** Fish Shell
I think the [[https://fishshell.com/][fish shell]] is an interesting experiment (and I appreciate the basics that come with [[https://github.com/emacsmirror/fish-mode][fish-mode]]).
#+begin_src emacs-lisp
  (use-package fish-mode
    :mode (rx ".fish" eol)
    :config
    (ha-auto-insert-file (rx ".fish") "fish-mode.sh")
    :hook
    (fish-mode . (lambda () (add-hook 'before-save-hook 'fish_indent-before-save))))
#+end_src
* Technical Artifacts                                :noexport:
Provide a name to =require= this code.
#+begin_src emacs-lisp :exports none
  (provide 'ha-programming)
  ;;; ha-programming.el ends here
#+end_src

Before you can build this on a new system, make sure that you put the cursor over any of these properties, and hit: ~C-c C-c~

#+description: A literate programming file for helping me program.

#+property:    header-args:sh :tangle no
#+property:    header-args:emacs-lisp :tangle yes
#+property:    header-args    :results none :eval no-export :comments no mkdirp yes

#+options:     num:nil toc:t todo:nil tasks:nil tags:nil date:nil
#+options:     skip:nil author:nil email:nil creator:nil timestamp:nil
#+infojs_opt:  view:nil toc:t ltoc:t mouse:underline buttons:0 path:http://orgmode.org/org-info.js
