Use straight for agda

We can fetch the mode directly from straight. There's no need to rely on
having this .el file installed for us. Now agda's el files can be edited
directly like all other emacs packages.

Signed-off-by: Rudi Grinberg <rudi.grinberg@gmail.com>

modules/lang/agda/config.el

@@ -1,17 +1,8 @@
 ;;; lang/agda/config.el -*- lexical-binding: t; -*-
 
-(defvar +agda-dir
-  (when (executable-find "agda-mode")
-    (file-name-directory (shell-command-to-string "agda-mode locate"))))
-
-(use-package! agda2
-  :when +agda-dir
-  :load-path +agda-dir)
-
-(use-package! agda2-mode
-  :defer t
-  :config
-  (map! :map agda2-mode-map
+(map!
+ :after agda2-mode
+ :map agda2-mode-map
  :localleader
  "?"   #'agda2-show-goals
  "."   #'agda2-goal-and-context-and-inferred
@@ -38,4 +29,4 @@
    "d"   #'agda2-remove-annotations
    "h"   #'agda2-display-implicit-arguments
    "q"   #'agda2-quit
-          "r"   #'agda2-restart)))
+   "r"   #'agda2-restart))

modules/lang/agda/doctor.el

@@ -1,5 +0,0 @@
-;; -*- lexical-binding: t; no-byte-compile: t; -*-
-;;; lang/agda/doctor.el
-
-(unless (executable-find "agda-mode")
-  (warn! "Couldn't find agda-mode. Agda support won't work"))

modules/lang/agda/packages.el

@@ -0,0 +1,15 @@
+;; -*- no-byte-compile: t; -*-
+;;; lang/agda/packages.el
+
+
+(package! agda-input
+  :recipe
+  (:host github :repo "agda/agda"
+         :files ("src/data/emacs-mode/agda-input.el")))
+
+(package! agda2-mode
+  :recipe
+  (:host github :repo "agda/agda"
+         :files
+         ("src/data/emacs-mode/*.el"
+          (:exclude "agda-input.el"))))