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authorWilliam Carroll <wpcarro@gmail.com>2019-10-09T11·13+0100
committerWilliam Carroll <wpcarro@gmail.com>2019-12-24T15·21+0000
commit6b456c1b7a4f6899f063a6e65355af51901d9c7a (patch)
treecfc70d74818ae9fabdbbfb0cf16cce092e4c1a09 /configs/shared/.emacs.d/wpc/scope.el
parenta7c72adb2ebec1e497fc040eaf3551d564d61a5b (diff)
Massive configuration overhaul
Currently paying the price of months of non-diligent git usage.

Here's what has changed.

- Theming support in Gvcci and wpgtk
- Dropping support for i3
- Supporting EXWM
- Many Elisp modules
- Collapsed redundant directories in ./configs
Diffstat (limited to 'configs/shared/.emacs.d/wpc/scope.el')
-rw-r--r--configs/shared/.emacs.d/wpc/scope.el99
1 files changed, 99 insertions, 0 deletions
diff --git a/configs/shared/.emacs.d/wpc/scope.el b/configs/shared/.emacs.d/wpc/scope.el
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+;;; scope.el --- Work with a scope data structure -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; Exposing an API for working with a scope data structure in a non-mutative
+;; way.
+;;
+;; What's a scope?  Think of a scope as a stack of key-value bindings.
+
+;;; Code:
+
+(require 'alist)
+(require 'stack)
+(require 'struct)
+(require 'macros)
+
+(cl-defstruct scope scopes)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Create
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun scope/new ()
+  "Return an empty scope."
+  (make-scope :scopes (->> (stack/new)
+                           (stack/push (alist/new)))))
+
+(defun scope/flatten (xs)
+  "Return a flattened representation of the scope, XS.
+The newest bindings eclipse the oldest."
+  (->> xs
+       scope-scopes
+       stack/to-list
+       (list/reduce (alist/new)
+                    (lambda (scope acc)
+                      (alist/merge acc scope)))))
+
+(defun scope/push-new (xs)
+  "Push a new, empty scope onto XS."
+  (struct/update scope
+                 scopes
+                 (>> (stack/push (alist/new)))
+                 xs))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Read
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun scope/get (k xs)
+  "Return K from XS if it's in scope."
+  (->> xs
+       scope/flatten
+       (alist/get k)))
+
+(defun scope/current (xs)
+  "Return the newest scope from XS."
+  (let ((xs-copy (copy-scope xs)))
+    (->> xs-copy
+         scope-scopes
+         stack/peek)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Update
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun scope/set (k v xs)
+  "Set value, V, at key, K, in XS for the current scope."
+  (struct/update scope
+                 scopes
+                 (>> (stack/map-top (>> (alist/set k v))))
+                 xs))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Delete
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun scope/pop (xs)
+  "Return a new scope without the top element from XS."
+  (->> xs
+       scope-scopes
+       stack/pop))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Predicates
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun scope/defined? (k xs)
+  "Return t if K is in scope of XS."
+  (->> xs
+       scope/flatten
+       (alist/has-key? k)))
+
+;; TODO: Find a faster way to write aliases like this.
+(defun scope/instance? (xs)
+  "Return t if XS is a scope struct."
+  (scope-p xs))
+
+(provide 'scope)
+;;; scope.el ends here