chore(editor): Replace smex with amx package

Smex has not been updated since late 2015. Amx was originally a fork of
smex, but as since evolved much further into it's own thing.

Among other things is supports other completing backends, and ivy with
it's fuzzy matching feels rather nice. I'm keeping ido-mode for
everything else, but specifically for M-x I'll give ivy a try.

core/siren-core-modules.el

@@ -21,6 +21,7 @@
 (require 'siren-dash-at-point)
 
 ;; Editor
+(require 'siren-amx)
 (require 'siren-browse-kill-ring)
 (require 'siren-display-fill-column)
 (require 'siren-display-indentation)
@@ -31,7 +32,6 @@
 (require 'siren-minions)
 (require 'siren-mwim)
 (require 'siren-rainbow)
-(require 'siren-smex)
 (require 'siren-undo-tree)
 (require 'siren-undohist)
 

modules/editor/siren-amx.el

@@ -0,0 +1,29 @@
+;;; siren-amx.el --- jimeh's Emacs Siren: amx configuration.
+
+;;; Commentary:
+
+;; Replace M-x with the more powerful amx.
+
+;;; Code:
+
+(require 'siren-ivy)
+
+(use-package amx
+  :bind
+  ("M-x" . amx)
+  ("C-x C-m" . amx)
+  ("C-c C-m" . amx)
+  ("C-c C-c M-x" . execute-extended-command)
+
+  :custom
+  (amx-backend 'ivy)
+  (amx-histroy-lenth 15)
+  (amx-prompt-string "M-x ")
+  (amx-save-file (expand-file-name "amx-items" siren-cache-dir))
+  (amx-show-key-bindings t)
+
+  :config
+  (amx-mode +1))
+
+(provide 'siren-amx)
+;;; siren-amx.el ends here

modules/editor/siren-ido.el

@@ -21,7 +21,7 @@
   (ido-use-faces nil)
   (ido-use-filename-at-point nil)
 
-  :init
+  :config
   (ido-mode 1))
 
 (use-package ido-completing-read+

modules/editor/siren-ivy.el

@@ -0,0 +1,19 @@
+;;; siren-ivy.el --- jimeh's Emacs Siren: ivy configuration.
+
+;;; Commentary:
+
+;; Basic configuration for ivy.
+
+;;; Code:
+
+(use-package ivy
+  :defer t
+
+  :custom
+  (ivy-use-virtual-buffers nil)
+  (ivy-count-format "%d ")
+  (ivy-re-builders-alist '((amx-completing-read-ivy . ivy--regex-fuzzy)
+                           (t . ivy--regex-plus))))
+
+(provide 'siren-ivy)
+;;; siren-ivy.el ends here

modules/editor/siren-smex.el

@@ -1,4 +1,4 @@
-;;; siren-smex.el --- jimeh's Emacs Siren: smex.
+;;; siren-smex.el --- jimeh's Emacs Siren: smex configuration.
 
 ;;; Commentary:
 

modules/navigation/siren-helm.el

@@ -24,7 +24,6 @@
   (helm-cleanup . siren-helm--show-treemacs-maybe)
 
   :bind
-  ("M-x" . helm-M-x)
   ("C-t" . helm-imenu)
   ("C-c t" . helm-imenu-anywhere)
   ("C-x C-f" . helm-find-files)