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[elpa] externals/taxy dbad5b9 01/39: Let there be taxonomy!


From: ELPA Syncer
Subject: [elpa] externals/taxy dbad5b9 01/39: Let there be taxonomy!
Date: Fri, 27 Aug 2021 10:57:29 -0400 (EDT)

branch: externals/taxy
commit dbad5b9b60ebc9fe473acf22a052d923162108a3
Author: Adam Porter <adam@alphapapa.net>
Commit: Adam Porter <adam@alphapapa.net>

    Let there be taxonomy!
---
 LICENSE    | 674 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 README.org | 166 +++++++++++++++
 taxy.el    |  72 +++++++
 3 files changed, 912 insertions(+)

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
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+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.org b/README.org
new file mode 100644
index 0000000..279e27e
--- /dev/null
+++ b/README.org
@@ -0,0 +1,166 @@
+#+TITLE: taxy.el
+
+#+PROPERTY: LOGGING nil
+
+# Note: This readme works with the org-make-toc 
<https://github.com/alphapapa/org-make-toc> package, which automatically 
updates the table of contents.
+
+# 
[[https://melpa.org/#/package-name][file:https://melpa.org/packages/taxy-badge.svg]]
 
[[https://stable.melpa.org/#/package-name][file:https://stable.melpa.org/packages/taxy-badge.svg]]
+
+This library provides a way to programmably categorize arbitrary objects into 
a hierarchical taxonomy.  (That's a lot of fancy words to say that this lets 
you put things in groups.)
+
+* Examples
+
+This is a silly taxonomy of numbers below 100:
+
+#+BEGIN_SRC elisp
+  ("Numbery" "A silly taxonomy of numbers."
+   (("< 10" "Numbers below 10"
+     (("Odd"
+       (1 3 5 7 9))
+      ("Even"
+       (0 2 4 6 8))))
+    ("> 10" "Numbers above 9"
+     (("Divisible by 3"
+       (12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 
81 84
+           87 90 93 96 99))
+      ("Divisible by 4"
+       (12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96))
+      ("Divisible by 3 or 4"
+       (12 15 16 18 20 21 24 27 28 30 32 33 36 39 40 42 44 45 48 51 52 54 56 
57 60
+           63 64 66 68 69 72 75 76 78 80 81 84 87 88 90 92 93 96 99))
+      ("Not divisible by 3 or 4"
+       (10 11 13 14 17 19 22 23 25 26 29 31 34 35 37 38 41 43 46 47 49 50 53 
55 58
+           59 61 62 65 67 70 71 73 74 77 79 82 83 85 86 89 91 94 95 97 98))))))
+#+END_SRC
+
+You might think about how to produce that by writing some imperative code, but 
=taxy= allows you to do so in a more declarative and functional manner:
+
+#+BEGIN_SRC elisp :exports code
+  (require 'taxy)
+
+  (let ((numbery
+         (make-taxy :name "Numbery"
+                    :description "A silly taxonomy of numbers."
+                    :predicate #'numberp
+                    :then #'ignore
+                    :taxys (list (make-taxy :name "< 10"
+                                            :description "Numbers below 10"
+                                            :predicate (lambda (n) (< n 10))
+                                            :then #'ignore
+                                            :taxys (list (make-taxy :name "Odd"
+                                                                    :predicate 
#'oddp
+                                                                    :then 
#'ignore)
+                                                         (make-taxy :name 
"Even"
+                                                                    :predicate 
#'evenp
+                                                                    :then 
#'ignore)))
+                                 (make-taxy :name "> 10"
+                                            :description "Numbers above 9"
+                                            :predicate (lambda (n) (>= n 10))
+                                            :then #'ignore
+                                            :taxys (list (make-taxy :name 
"Divisible by 3"
+                                                                    :predicate 
(lambda (n) (zerop (mod n 3)))
+                                                                    :then 
#'identity)
+                                                         (make-taxy :name 
"Divisible by 4"
+                                                                    :predicate 
(lambda (n) (zerop (mod n 4)))
+                                                                    :then 
#'identity)
+                                                         (make-taxy :name 
"Divisible by 3 or 4"
+                                                                    :predicate 
(lambda (n) (or (zerop (mod n 3))
+                                                                               
                (zerop (mod n 4))))
+                                                                    :then 
#'ignore)
+                                                         (make-taxy :name "Not 
divisible by 3 or 4"
+                                                                    :predicate 
#'identity
+                                                                    :then 
#'ignore))))))
+        (numbers (cl-loop for i below 100 collect i)))
+    (taxy-simple (taxy-apply numbery (reverse numbers))))
+#+END_SRC
+
+The ~taxy-apply~ function applies the numbers in a "cascade" down the 
hierarchy of "taxys", and the ~taxy-simple~ function returns a meaningful 
subset of the taxys' slots, suitable for display.
+
+* Contents                                                         :noexport:
+:PROPERTIES:
+:TOC:      :include siblings
+:END:
+:CONTENTS:
+  -  [[#installation][Installation]]
+  -  [[#usage][Usage]]
+  -  [[#changelog][Changelog]]
+  -  [[#credits][Credits]]
+  -  [[#development][Development]]
+  -  [[#license][License]]
+:END:
+
+# * Installation
+# :PROPERTIES:
+# :TOC:      :depth 0
+# :END:
+# 
+# ** MELPA
+# 
+# If you installed from MELPA, you're done.  Just run one of the commands 
below.
+# 
+# ** Manual
+# 
+#   Install these required packages:
+# 
+#   + =foo=
+#   + =bar=
+# 
+#   Then put this file in your load-path, and put this in your init file:
+# 
+#   #+BEGIN_SRC elisp
+# (require 'taxy)
+#   #+END_SRC
+
+* Usage
+:PROPERTIES:
+:TOC:      :depth 0
+:END:
+
+A taxy is defined with the ~make-taxy~ constructor, like:
+
+#+BEGIN_SRC elisp
+  (make-taxy :name "Numbery"
+             :description "A silly taxonomy of numbers."
+             :predicate #'numberp
+             :then #'ignore
+             :taxys (list ...))
+#+END_SRC
+
+The ~:predicate~ function determines whether an object fits into that taxy.  
If it does, ~taxy-apply~ adds the object to that taxy's descendant ~:taxys~, if 
present, or to its own ~objects~.
+
+The ~:then~ function determines what happens to an object after being applied: 
if the function, called with the object, returns a non-nil value, that value is 
applied to other taxys at the same level until one of them returns nil or no 
more taxys remain.
+
+After defining a taxy, call ~taxy-apply~ with it and a list of objects to fill 
the taxy's hierarchy.
+
+To return a taxy in a more human-readable format (with only relevant fields 
included), use ~taxy-simple~.
+
+# ** Tips
+# 
+# + You can customize settings in the =taxy= group.
+
+* Changelog
+:PROPERTIES:
+:TOC:      :depth 0
+:END:
+
+** 0.1-pre
+
+Not yet tagged.
+
+# * Credits
+
+* Development
+
+Bug reports, feature requests, suggestions — /oh my/!
+
+* License
+
+GPLv3
+
+# Local Variables:
+# eval: (require 'org-make-toc)
+# before-save-hook: org-make-toc
+# org-export-with-properties: ()
+# org-export-with-title: t
+# End:
+
diff --git a/taxy.el b/taxy.el
new file mode 100644
index 0000000..ddbe311
--- /dev/null
+++ b/taxy.el
@@ -0,0 +1,72 @@
+;;; taxy.el --- Programmable taxonomical grouping for arbitrary objects  -*- 
lexical-binding: t; -*-
+
+;; Copyright (C) 2021  Adam Porter
+
+;; Author: Adam Porter <adam@alphapapa.net>
+;; Keywords:
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+;;;; Requirements
+
+(require 'cl-lib)
+
+;;;; Structs
+
+(cl-defstruct taxy
+  name description objects
+  predicate then taxys)
+
+;;;; Variables
+
+
+;;;; Customization
+
+
+;;;; Commands
+
+
+;;;; Functions
+
+(defun taxy-apply (taxy objects)
+  (cl-labels ((apply-object (taxy object)
+                            (cl-loop for taxy in (taxy-taxys taxy)
+                                     while object
+                                     when (funcall (taxy-predicate taxy) 
object)
+                                     do (setf object
+                                              (if-let* ((taxys (taxy-taxys 
taxy)))
+                                                  (apply-object taxy object)
+                                                (push object (taxy-objects 
taxy))
+                                                (funcall (taxy-then taxy) 
object))))))
+    (dolist (object objects taxy)
+      (apply-object taxy object))))
+
+(defun taxy-simple (taxy)
+  (delq nil
+        (list (taxy-name taxy)
+              (taxy-description taxy)
+              (taxy-objects taxy)
+              (mapcar #'taxy-print (taxy-taxys taxy)))))
+
+;;;; Footer
+
+(provide 'taxy)
+
+;;; taxy.el ends here



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