[elixir] layer improevements

- declare lsp layer dependency if elixir-backind is lsp
- "C-j" now properly indents line
- add toggle breakpoint for elixir-mode

update CHANGELOG.develop

CHANGELOG.develop

@@ -1419,10 +1419,14 @@ Other:
     - Added ~SPC m o R~ to macroexpand print region
 - Added elixir format keybind (thanks to Perry Fraser)
   - ~SPC m =~ to format current buffer
--  Change binding of  =alchemist-project-find-test= from
-  ~SPC m p t~ to ~SPC m t F~ (thanks to Lyuben Petrov)
+- Change binding of  =alchemist-project-find-test= from
+ ~SPC m p t~ to ~SPC m t F~ (thanks to Lyuben Petrov)
 - Mark alchemist jump handler as async (thanks to Lukasz Czaplinski)
 - Added elixir-ls backend (thanks to mpanarin)
+- Added breakpoint toggle to alchemist binds (thanks to mpanarin)
+  - Added ~SPC m d b~ to toggle IEx.pry breakpoint
+- lsp layer is a dependency when backend is set to 'lsp (thanks to mpanarin)
+- "C-j" indents line properly (thanks to mpanarin)
 **** Elm
 - Fixed flycheck initialization (thanks to Kevin W. van Rooijen)
 - Added =elm-test-runner= (thanks to Juan Edi)

layers/+lang/elixir/README.org

@@ -33,6 +33,7 @@
     - [[#hex-packages][Hex (packages)]]
     - [[#macro-expand][Macro expand]]
     - [[#formatting][Formatting]]
+    - [[#debugging][Debugging]]
   - [[#lsp][LSP]]
 
 * Description
@@ -333,5 +334,11 @@ Hex is the package manager for Elixir & Erlang ecosystem. See [[https://hex.pm]]
 |-------------+---------------------------|
 | ~SPC m =~   | Format the current buffer |
 
+*** Debugging
+
+| Key binding | Description               |
+|-------------+---------------------------|
+| ~SPC m d b~ | Toggle IEx.pry breakpoint |
+
 ** LSP
 You find and overview of all the key bindings on the [[https://github.com/syl20bnr/spacemacs/tree/develop/layers/%2Btools/lsp#key-bindings][lsp layer description]].

layers/+lang/elixir/funcs.el

@@ -65,6 +65,14 @@
 
 ;; others
 
+(defun spacemacs//elixir-default ()
+  "Default settings for elixir buffers"
+
+  ;; highlight all breakpoints
+  (spacemacs/elixir-annotate-pry)
+  ;; make C-j work the same way as RET
+  (local-set-key (kbd "C-j") 'newline-and-indent))
+
 (defun spacemacs//elixir-looking-back-special-p (expr)
   (save-excursion
     (when (or (looking-back " ")
@@ -93,3 +101,20 @@
     (flycheck-mix-setup)
     ;; enable credo only if there are no compilation errors
     (flycheck-add-next-checker 'elixir-mix '(warning . elixir-credo))))
+
+(defun spacemacs/elixir-annotate-pry ()
+  "Highlight breakpoint lines."
+  (interactive)
+  (highlight-lines-matching-regexp "require IEx; IEx.pry"))
+
+(defun spacemacs/elixir-toggle-breakpoint ()
+  "Add a breakpoint line or clear it if line is already a breakpoint."
+  (interactive)
+  (let ((trace "require IEx; IEx.pry")
+        (line (thing-at-point 'line)))
+    (if (and line (string-match trace line))
+        (kill-whole-line)
+      (progn
+        (back-to-indentation)
+        (insert trace)
+        (newline-and-indent)))))

layers/+lang/elixir/layers.el

@@ -0,0 +1,14 @@
+;;; layers.el --- Elixir Layer declarations File for Spacemacs
+;;
+;; Copyright (c) 2012-2019 Sylvain Benner & Contributors
+;;
+;; Author: Sylvain Benner <sylvain.benner@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+(when (and (boundp 'elixir-backend)
+           (eq elixir-backend 'lsp))
+  (configuration-layer/declare-layer 'lsp))

layers/+lang/elixir/packages.el

@@ -53,6 +53,7 @@
     (spacemacs/declare-prefix-for-mode 'elixir-mode "ms" "iex")
     (spacemacs/declare-prefix-for-mode 'elixir-mode "mt" "test")
     (spacemacs/declare-prefix-for-mode 'elixir-mode "mx" "execute")
+    (spacemacs/declare-prefix-for-mode 'elixir-mode "md" "debug")
     (spacemacs/set-leader-keys-for-major-mode 'elixir-mode
       "el" 'alchemist-eval-current-line
       "eL" 'alchemist-eval-print-current-line
@@ -130,7 +131,9 @@
       "oi" 'alchemist-macroexpand-once-region
       "oI" 'alchemist-macroexpand-once-print-region
       "or" 'alchemist-macroexpand-region
-      "oR" 'alchemist-macroexpand-print-region)
+      "oR" 'alchemist-macroexpand-print-region
+
+      "db" 'spacemacs/elixir-toggle-breakpoint)
 
     (dolist (mode (list alchemist-compile-mode-map
                         alchemist-eval-mode-map
@@ -165,7 +168,8 @@
   (use-package elixir-mode
     :defer t
     :init (spacemacs/add-to-hook 'elixir-mode-hook
-                                 '(spacemacs//elixir-setup-backend))
+                                 '(spacemacs//elixir-setup-backend
+                                   spacemacs//elixir-default))
     :config
     (spacemacs/set-leader-keys-for-major-mode 'elixir-mode
       "=" 'elixir-format)))