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+;;; ~/.doom.d/grid.el -*- lexical-binding: t; -*-
+
+(require 's)
+
+(defun grfn/all-match-groups (s)
+  (loop for n from 1
+        for x = (match-string n s)
+        while x
+        collect x))
+
+(defun projectile-grid-ff (path &optional ask)
+  "Call `find-file' function on PATH when it is not nil and the file exists.
+If file does not exist and ASK in not nil it will ask user to proceed."
+  (if (or (and path (file-exists-p path))
+          (and ask (yes-or-no-p
+                    (s-lex-format
+                     "File does not exists. Create a new buffer ${path} ?"))))
+      (find-file path)))
+
+(defun projectile-grid-goto-file (filepath &optional ask)
+  "Find FILEPATH after expanding root.  ASK is passed straight to `projectile-grid-ff'."
+  (projectile-grid-ff (projectile-expand-root filepath) ask))
+
+(defun projectile-grid-choices (ds)
+  "Uses `projectile-dir-files' function to find files in directories.
+The DIRS is list of lists consisting of a directory path and regexp to filter files from that directory.
+Optional third element can be present in the DS list. The third element will be a prefix to be placed before
+the filename in the resulting choice.
+Returns a hash table with keys being short names (choices) and values being relative paths to the files."
+  (loop with hash = (make-hash-table :test 'equal)
+        for (dir re prefix) in ds do
+        (loop for file in (projectile-dir-files (projectile-expand-root dir)) do
+              (when (string-match re file)
+                (puthash
+                 (concat (or prefix "")
+                         (s-join "/" (grfn/all-match-groups file)))
+                 (concat dir file)
+                 hash)))
+        finally return hash))
+
+(defmacro projectile-grid-find-resource (prompt dirs &optional newfile-template)
+  "Presents files from DIRS with PROMPT to the user using `projectile-completing-read'.
+If users chooses a non existant file and NEWFILE-TEMPLATE is not nil
+it will use that variable to interpolate the name for the new file.
+NEWFILE-TEMPLATE will be the argument for `s-lex-format'.
+The bound variable is \"filename\"."
+  `(lexical-let ((choices (projectile-grid-choices ,dirs)))
+     (projectile-completing-read
+      ,prompt
+      (hash-table-keys choices)
+      :action
+      (lambda (c)
+        (let* ((filepath (gethash c choices))
+               (filename c)) ;; so `s-lex-format' can interpolate FILENAME
+          (if filepath
+              (projectile-grid-goto-file filepath)
+            (when-let ((newfile-template ,newfile-template))
+              (projectile-grid-goto-file
+               (funcall newfile-template filepath)
+               ;; (cond
+               ;;  ((functionp newfile-template) (funcall newfile-template filepath))
+               ;;  ((stringp newfile-template) (s-lex-format newfile-template)))
+               t))))))))
+
+(defun projectile-grid-find-model ()
+  "Find a model."
+  (interactive)
+  (projectile-grid-find-resource
+   "model: "
+   '(("python/urbint_lib/models/"
+      "\\(.+\\)\\.py$")
+     ("python/urbint_lib/"
+      "\\(.+\\)/models/\\(.+\\).py$"))
+   (lambda (filename)
+     (pcase (s-split "/" filename)
+       (`(,model)
+        (s-lex-format "python/urbint_lib/models/${model}.py"))
+       (`(,app ,model)
+        (s-lex-format "python/urbint_lib/${app}/models/${model}.py"))))))
+
+(defun projectile-grid-find-repository ()
+  "Find a repository."
+  (interactive)
+  (projectile-grid-find-resource
+   "repository: "
+   '(("python/urbint_lib/repositories/"
+      "\\(.+\\)\\.py$")
+     ("python/urbint_lib/"
+      "\\(.+\\)/repositories/\\(.+\\).py$"))
+   (lambda (filename)
+     (pcase (s-split "/" filename)
+       (`(,repository)
+        (s-lex-format "python/urbint_lib/repositories/${repository}.py"))
+       (`(,app ,repository)
+        (s-lex-format "python/urbint_lib/${app}/repositories/${repository}.py"))))))
+
+(defun projectile-grid-find-controller ()
+  "Find a controller."
+  (interactive)
+  (projectile-grid-find-resource
+   "controller: "
+   '(("backend/src/grid/api/controllers/"
+      "\\(.+\\)\\.py$")
+     ("backend/src/grid/api/apps/"
+      "\\(.+\\)/controllers/\\(.+\\).py$"))
+   (lambda (filename)
+     (pcase (s-split "/" filename)
+       (`(,controller)
+        (s-lex-format "backend/src/grid/api/controllers/${controller}.py"))
+       (`(,app ,controller)
+        (s-lex-format "backend/src/grid/api/apps/${app}/controllers/${controller}.py"))))))
+
+(setq projectile-grid-mode-map
+  (let ((map (make-keymap)))
+    (map!
+     (:map map
+      (:leader
+       (:desc "Edit..." :prefix "e"
+        :desc "Model"      :n "m" #'projectile-grid-find-model
+        :desc "Controller" :n "c" #'projectile-grid-find-controller
+        :desc "Repository" :n "r" #'projectile-grid-find-repository))))
+    map))
+
+(define-minor-mode projectile-grid-mode
+  "Minor mode for finding files in GRID"
+  :init-value nil
+  :lighter " GRID"
+  :keymap projectile-grid-mode-map)