feat(cli): add 'doom make completions' for zsh

'doom make completions' will generate a rudimentary ZSH completion
script for bin/doom. It can be used from your shell dotfiles, but I
recommend caching the output with a function like:
https://github.com/hlissner/dotfiles/blob/master/config/zsh/.zshenv#L1-L14.

Then add this to your .zshrc:

  _cache doom make completions --zsh && compdef _doom doom

Ref: https://github.com/hlissner/dotfiles/blob/master/config/zsh/.zshenv#L1-L14

core/cli/make.el

@@ -0,0 +1,64 @@
+;;; core/cli/make.el --- file generation commands -*- lexical-binding: t; -*-
+;;; Commentary:
+;;; Code:
+
+(load! "make/completions")
+;; (load! "make/docs")
+;; (load! "make/manpage")
+
+
+;;
+;;; Variables
+
+;; (defvar doom-make-codeowners ()
+;;   "TODO")
+
+
+;;
+;;; Commands
+
+(defcli! make ()
+  "(Re)Generate project files and boilerplate."
+  :partial t)
+
+;; TODO Finish and generalize me
+(defcli! (make codeowners) ()
+  "TODO"
+  :stub t
+  (print! (start "Generating CODEOWNERS file"))
+  (let ((codeowners (doom-path doom-emacs-dir ".github/CODEOWNERS")))
+    (with-temp-file codeowners
+      (insert-file-contents codeowners)
+      (when (re-search-forward "^# Don't edit this by hand!" nil t)
+        (goto-char (line-end-position))
+        (delete-region (point) (point-max))
+        (insert "\n")
+        (dolist (path (cdr (doom-module-load-path (list doom-modules-dir))))
+          (when (string-match "/modules/\\([^/]+\\)/\\([^/]+\\)/$" path)
+            (insert (format "%-35s @doomemacs/maintainers @doomemacs/%s-%s\n"
+                            (concat (substring (match-string-no-properties 0 path) 1) "*")
+                            (match-string-no-properties 1 path)
+                            (match-string-no-properties 2 path)))))))))
+
+;; TODO Finish me
+(defcli! (make changelog) () :stub t)
+
+
+
+;;
+;;; Helpers
+
+(defmacro doom-make--with-file (file &rest body)
+  (declare (indent 1))
+  `(let ((inhibit-read-only t))
+     (with-current-buffer
+         (or (get-file-buffer ,file)
+             (find-file-noselect ,file))
+       (save-excursion
+         (goto-char (point-min))
+         ,@body
+         (when (buffer-modified-p)
+           (save-buffer))))))
+
+(provide 'core-cli-make)
+;;; make.el ends here